diff --git a/lib/debug_pocket_main.dart b/lib/debug_pocket_main.dart
index f5dcbc6..19b6374 100644
--- a/lib/debug_pocket_main.dart
+++ b/lib/debug_pocket_main.dart
@@ -1,5 +1,5 @@
 import 'package:flutter/material.dart';
-import 'nfc_poccket_checkin_screen.dart';
+import 'ui/nfc_poccket_checkin_screen.dart';
 
 // 🧪 디버그 전용 진입점: NFC 주머니 체크인 + 조도 센서 감시 화면을 바로 테스트하기 위한 파일.
 void main() {
diff --git a/lib/function/admin_controller.dart b/lib/function/admin_controller.dart
new file mode 100644
index 0000000..d3b8fe3
--- /dev/null
+++ b/lib/function/admin_controller.dart
@@ -0,0 +1,31 @@
+// 🛠️ 관리자 대시보드의 기능(서버 통신/상태) 담당 컨트롤러.
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import '../config.dart';
+
+class AdminController extends ChangeNotifier {
+  bool _isLoading = false;
+  bool get isLoading => _isLoading;
+
+  Future<String> resetDatabase() async {
+    _isLoading = true;
+    notifyListeners();
+
+    // 🆕 백엔드 보안 규칙에 맞추어 초기화 토큰 비밀번호 파라미터(?password=...)를 연동 주소에 매칭했습니다.
+    final url = Uri.parse('$baseUrl/reset-db?password=adminreset2010');
+
+    try {
+      final response = await http.get(url);
+      if (response.statusCode == 200) {
+        return '💥 DB가 깔끔하게 초기화되었습니다! (출석 번호 1번부터 시작)';
+      } else {
+        return '❌ 초기화 실패: 서버 권한 오류 (${response.statusCode})';
+      }
+    } catch (e) {
+      return '❌ 네트워크 에러: 서버와 연결할 수 없습니다.';
+    } finally {
+      _isLoading = false;
+      notifyListeners();
+    }
+  }
+}
diff --git a/lib/function/login_controller.dart b/lib/function/login_controller.dart
new file mode 100644
index 0000000..5dab246
--- /dev/null
+++ b/lib/function/login_controller.dart
@@ -0,0 +1,211 @@
+// 🔑 로그인 화면의 기능(서버 통신/인증 분기 로직) 담당 컨트롤러.
+// 위젯/BuildContext/다이얼로그 코드는 없다 — 전부 UI 파일(lib/screens/login_screen.dart) 몫.
+import 'dart:convert';
+import 'package:flutter/foundation.dart' show ChangeNotifier, kIsWeb;
+import 'package:http/http.dart' as http;
+import 'package:firebase_messaging/firebase_messaging.dart';
+import '../config.dart';
+
+enum LoginOutcome { masterSuccess, needsPasswordChange, success, error }
+
+/// 로그인 시도 결과. UI는 [outcome]만 보고 어떤 화면/다이얼로그를 띄울지 분기한다.
+class LoginResult {
+  final LoginOutcome outcome;
+  final String? role;
+  final String? studentId;
+  final String? name;
+  final bool isDeviceMatched;
+  final String? errorMessage;
+
+  const LoginResult.masterSuccess({
+    required this.studentId,
+    required this.name,
+  }) : outcome = LoginOutcome.masterSuccess,
+       role = null,
+       isDeviceMatched = true,
+       errorMessage = null;
+
+  const LoginResult.needsPasswordChange({
+    required this.studentId,
+    required this.name,
+    required this.role,
+    required this.isDeviceMatched,
+  }) : outcome = LoginOutcome.needsPasswordChange,
+       errorMessage = null;
+
+  const LoginResult.success({
+    required this.role,
+    required this.studentId,
+    required this.name,
+    required this.isDeviceMatched,
+  }) : outcome = LoginOutcome.success,
+       errorMessage = null;
+
+  const LoginResult.error(this.errorMessage)
+    : outcome = LoginOutcome.error,
+      role = null,
+      studentId = null,
+      name = null,
+      isDeviceMatched = false;
+}
+
+class LoginController extends ChangeNotifier {
+  bool _isLoading = false;
+  bool get isLoading => _isLoading;
+
+  Future<LoginResult> login(String id, String password) async {
+    if (id.isEmpty || password.isEmpty) {
+      return const LoginResult.error('⚠️ 학번과 비밀번호를 모두 입력해 주세요.');
+    }
+
+    // 🔥 [개발자 마스터 계정]
+    if (id == "2061") {
+      if (password == "happy9642!") {
+        return const LoginResult.masterSuccess(
+          studentId: "2061",
+          name: "훗춧가룻",
+        );
+      } else {
+        return const LoginResult.error('개발자 계정의 마스터 비밀번호가 올바르지 않습니다.');
+      }
+    }
+
+    _isLoading = true;
+    notifyListeners();
+
+    try {
+      String deviceUuid = await getDeviceUuid();
+      String fcmToken = "";
+
+      try {
+        fcmToken = kIsWeb
+            ? await FirebaseMessaging.instance.getToken(
+                    vapidKey: webVapidKey,
+                  ) ??
+                  ""
+            : await FirebaseMessaging.instance.getToken() ?? "";
+      } catch (e) {
+        // 파이어베이스 미설정 등 - 로그인 자체는 계속 진행
+      }
+
+      final response = await http.post(
+        Uri.parse('$baseUrl/login'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({
+          "studentId": id,
+          "password": password,
+          "deviceUuid": deviceUuid,
+          "fcmToken": fcmToken,
+        }),
+      );
+
+      final resData = jsonDecode(utf8.decode(response.bodyBytes));
+
+      if (response.statusCode == 200) {
+        String role = '';
+        String name = '';
+        String studentId = '';
+        int isFirstLogin = 0;
+
+        var userObj = resData['user'];
+        if (userObj != null) {
+          role = userObj['role']?.toString() ?? '';
+          name =
+              userObj['name']?.toString() ??
+              userObj['studentName']?.toString() ??
+              userObj['student_name']?.toString() ??
+              '';
+          studentId =
+              userObj['studentId']?.toString() ??
+              userObj['student_id']?.toString() ??
+              id;
+
+          var rawFirst = userObj['isFirstLogin'] ?? userObj['is_first_login'];
+          isFirstLogin = (rawFirst is bool)
+              ? (rawFirst ? 1 : 0)
+              : (int.tryParse(rawFirst.toString()) ?? 0);
+        } else {
+          role = resData['role']?.toString() ?? '';
+          name =
+              resData['name']?.toString() ??
+              resData['studentName']?.toString() ??
+              '';
+          studentId = resData['studentId']?.toString() ?? id;
+
+          var rawFirst = resData['isFirstLogin'] ?? resData['is_first_login'];
+          isFirstLogin = (rawFirst is bool)
+              ? (rawFirst ? 1 : 0)
+              : (int.tryParse(rawFirst.toString()) ?? 0);
+        }
+
+        if (name.trim().isEmpty) {
+          name = "알수없음";
+        }
+
+        // 🆕 서버 응답 데이터에서 기기 일치 여부 추출하기
+        // (서버가 주는 Key 이름에 맞춰서 데이터를 가져옵니다. 아래 항목 중 맞는 게 알아서 들어감)
+        bool isDeviceMatched =
+            resData['isDeviceMatched'] ??
+            resData['isUuidMatched'] ??
+            resData['is_matched'] ??
+            (userObj != null
+                ? (userObj['isDeviceMatched'] ?? userObj['is_matched'] ?? false)
+                : false);
+
+        if (isFirstLogin == 1) {
+          return LoginResult.needsPasswordChange(
+            studentId: studentId,
+            name: name,
+            role: role,
+            isDeviceMatched: isDeviceMatched,
+          );
+        }
+
+        return LoginResult.success(
+          role: role,
+          studentId: studentId,
+          name: name,
+          isDeviceMatched: isDeviceMatched,
+        );
+      } else {
+        String errorMsg = '로그인에 실패했습니다.';
+        if (resData is Map) {
+          errorMsg =
+              resData['detail']?.toString() ??
+              resData['message']?.toString() ??
+              errorMsg;
+        }
+        return LoginResult.error(errorMsg);
+      }
+    } catch (e) {
+      return LoginResult.error('서버와 연결할 수 없습니다. 서버 상태를 확인하세요!\n($e)');
+    } finally {
+      _isLoading = false;
+      notifyListeners();
+    }
+  }
+
+  /// 🛠️ 초기 비밀번호 변경. (성공여부, 메시지)를 반환한다.
+  Future<(bool success, String message)> changePassword({
+    required String studentId,
+    required String newPassword,
+  }) async {
+    try {
+      final response = await http.post(
+        Uri.parse('$baseUrl/api/users/change-password'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({"studentId": studentId, "newPassword": newPassword}),
+      );
+
+      final resData = jsonDecode(utf8.decode(response.bodyBytes));
+
+      if (response.statusCode == 200 && resData['status'] == 'success') {
+        return (true, '✅ 비밀번호가 변경되었습니다!');
+      } else {
+        return (false, '❌ 실패: ${resData['message']}');
+      }
+    } catch (e) {
+      return (false, '서버 에러 발생: $e');
+    }
+  }
+}
diff --git a/lib/function/nfc_pocket_checkin_controller.dart b/lib/function/nfc_pocket_checkin_controller.dart
new file mode 100644
index 0000000..56eef73
--- /dev/null
+++ b/lib/function/nfc_pocket_checkin_controller.dart
@@ -0,0 +1,240 @@
+// 📲 자습실 NFC 출석체크 화면의 기능(NFC 세션/서버 통신/백그라운드 감시 연동) 담당 컨트롤러.
+// 다이얼로그/스낵바 등 실제 위젯 표시는 UI 파일(lib/nfc_poccket_checkin_screen.dart)의
+// 콜백을 통해서만 이루어진다 — 이 파일엔 위젯 코드가 없다.
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io' show Platform;
+import 'package:flutter/foundation.dart' show ChangeNotifier, kIsWeb;
+import 'package:flutter_background_service/flutter_background_service.dart';
+import 'package:http/http.dart' as http;
+import 'package:nfc_manager/nfc_manager.dart';
+import 'package:nfc_manager/nfc_manager_android.dart';
+import 'package:nfc_manager_ndef/nfc_manager_ndef.dart';
+import 'package:permission_handler/permission_handler.dart';
+import '../config.dart' show baseUrl;
+
+enum WatchMessageLevel { info, success, warning, error }
+
+class NfcPocketCheckinController extends ChangeNotifier {
+  final String studentId;
+  final String studentName;
+
+  /// 스낵바로 보여줄 일반 메시지 이벤트. UI가 레벨에 맞는 색상을 정해서 띄운다.
+  final void Function(String text, WatchMessageLevel level) onMessage;
+
+  /// 출석(태깅) 성공 시 축하 팝업을 띄우기 위한 콜백.
+  final void Function(String pocketNumber) onCheckInSuccess;
+
+  /// 무단반출 감지 시 경고 팝업을 띄우기 위한 콜백.
+  final void Function(String? pocketNumber) onViolationDetected;
+
+  NfcPocketCheckinController({
+    required this.studentId,
+    required this.studentName,
+    required this.onMessage,
+    required this.onCheckInSuccess,
+    required this.onViolationDetected,
+  });
+
+  bool _isProcessing = false; // 중복 태깅 및 연타 방지 플래그
+  bool _isWatching = false; // 백그라운드 조도 센서 감시가 진행 중인지 여부
+  String _statusMessage = "주머니의 NFC 스티커에 폰 뒷면을 대어주세요.";
+  String? _activePocketNumber;
+
+  StreamSubscription<Map<String, dynamic>?>? _violationSub;
+  StreamSubscription<Map<String, dynamic>?>? _checkedOutSub;
+
+  bool get isProcessing => _isProcessing;
+  bool get isWatching => _isWatching;
+  String get statusMessage => _statusMessage;
+  String? get activePocketNumber => _activePocketNumber;
+
+  bool get watchServiceSupported => !kIsWeb && Platform.isAndroid;
+
+  void init() {
+    _startNfcSession();
+    if (watchServiceSupported) {
+      // 화면이 열려있는 동안은 실시간으로 위반 알림을 받아 팝업을 띄운다.
+      // 무단 반출이 한 번 감지되면 "신뢰된 감시 세션"은 끝난 것으로 보고,
+      // 다음 태깅은 체크아웃이 아니라 새 출석(재출석)으로 처리되도록 감시 상태를 해제한다.
+      _violationSub = FlutterBackgroundService().on('violation_detected').listen((
+        event,
+      ) {
+        _isWatching = false;
+        notifyListeners();
+        onViolationDetected(event?['pocketNumber']?.toString());
+      });
+      // 🏫 하교 처리 등으로 반출이 허용된 상태에서 폰을 꺼내면, 위반이 아니라 정상 회수로 처리된다.
+      _checkedOutSub = FlutterBackgroundService().on('checked_out').listen((
+        event,
+      ) {
+        _isWatching = false;
+        _activePocketNumber = null;
+        _statusMessage = "✅ 폰을 회수했습니다. 수고하셨습니다!";
+        notifyListeners();
+        onMessage("✅ 폰이 정상적으로 회수되었습니다.", WatchMessageLevel.success);
+      });
+    }
+  }
+
+  @override
+  void dispose() {
+    // 화면을 나갈 때 NFC 감지만 종료. 백그라운드 감시 서비스는 화면과 무관하게 계속 동작해야 하므로 건드리지 않는다.
+    NfcManager.instance.stopSession();
+    _violationSub?.cancel();
+    _checkedOutSub?.cancel();
+    super.dispose();
+  }
+
+  /// 📡 NFC 감지 세션 시작
+  void _startNfcSession() async {
+    bool isAvailable = await NfcManager.instance.isAvailable();
+    if (!isAvailable) {
+      _statusMessage = "❌ 이 스마트폰은 NFC 기능이 꺼져있거나 지원되지 않습니다.";
+      notifyListeners();
+      return;
+    }
+
+    NfcManager.instance.startSession(
+      pollingOptions: {NfcPollingOption.iso14443, NfcPollingOption.iso15693},
+      onDiscovered: (NfcTag tag) async {
+        if (_isProcessing) return; // 이미 처리 중이면 연속 태그 무시 (쿨다운)
+
+        // 이미 감시 중일 때 다시 태깅하면 "폰 회수(체크아웃)"로 처리한다.
+        if (_isWatching) {
+          await _checkOut();
+          return;
+        }
+
+        _isProcessing = true;
+        _statusMessage = "⏳ 태그 인식 완료! 서버에 출석 전송 중...";
+        notifyListeners();
+
+        try {
+          // 1. NFC 태그에서 주머니 번호 데이터 읽기
+          Ndef? ndef = Ndef.from(tag);
+          String rawPocketData = "";
+
+          if (ndef != null && ndef.cachedMessage != null) {
+            for (var record in ndef.cachedMessage!.records) {
+              rawPocketData += String.fromCharCodes(record.payload);
+            }
+          }
+
+          // 텍스트 헤더 정리 (예: "\x02enPOCKET_17" -> "POCKET_17")
+          String cleanPocketNumber = "POCKET_UNKNOWN";
+          if (rawPocketData.contains("POCKET_")) {
+            int index = rawPocketData.indexOf("POCKET_");
+            cleanPocketNumber = rawPocketData.substring(index).trim();
+          } else if (rawPocketData.isNotEmpty) {
+            cleanPocketNumber = rawPocketData.trim();
+          }
+
+          // 2. 파이썬 서버로 출석 정보 보내기 (복제 방지용 태그 UID도 함께 전송)
+          await _sendAttendanceToBackend(
+            cleanPocketNumber,
+            tagUid: _getTagUid(tag),
+          );
+        } catch (e) {
+          onMessage("❌ 태그 읽기 실패: $e", WatchMessageLevel.error);
+        } finally {
+          // 3초 후 연타 방지 해제 (쿨다운)
+          await Future.delayed(const Duration(seconds: 3));
+          _isProcessing = false;
+          notifyListeners();
+        }
+      },
+    );
+  }
+
+  /// 태그의 공장 각인 하드웨어 UID를 16진수 문자열로 반환한다 (쓰기로 바꿀 수 없어 복제 방지 기준으로 씀).
+  String? _getTagUid(NfcTag tag) {
+    final id = NfcTagAndroid.from(tag)?.id;
+    if (id == null || id.isEmpty) return null;
+    return id
+        .map((b) => b.toRadixString(16).padLeft(2, '0'))
+        .join()
+        .toUpperCase();
+  }
+
+  /// 🚚 파이썬 백엔드로 출석 데이터 HTTP POST 전송
+  Future<void> _sendAttendanceToBackend(
+    String pocketNumber, {
+    String? tagUid,
+  }) async {
+    final url = Uri.parse("$baseUrl/attendance");
+
+    try {
+      final response = await http.post(
+        url,
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({
+          "studentId": studentId,
+          "studentName": studentName,
+          "pocketNumber": pocketNumber, // 주머니 번호 전달
+          "tagUid": tagUid, // 🔒 서버가 태그 진위를 대조할 하드웨어 UID
+        }),
+      );
+
+      if (response.statusCode == 200) {
+        final result = jsonDecode(utf8.decode(response.bodyBytes));
+        if (result["status"] == "success") {
+          onCheckInSuccess(pocketNumber);
+          await _startBackgroundWatch(pocketNumber);
+        } else {
+          onMessage("⚠️ 출석 실패: ${result['message']}", WatchMessageLevel.warning);
+        }
+      } else {
+        onMessage(
+          "🚨 서버 에러 (코드: ${response.statusCode})",
+          WatchMessageLevel.error,
+        );
+      }
+    } catch (e) {
+      onMessage("❌ 서버 연결 실패: $e", WatchMessageLevel.error);
+    }
+  }
+
+  // -----------------------------------------------------------------------
+  // 🛡️ 주머니 제출 모드: 화면이 꺼져도 백그라운드 서비스가 조도 센서로 감시
+  // -----------------------------------------------------------------------
+
+  /// NFC 태깅 성공 직후 호출. 배터리 최적화 예외를 한 번 요청한 뒤 백그라운드 감시 서비스를 시작한다.
+  Future<void> _startBackgroundWatch(String pocketNumber) async {
+    if (!watchServiceSupported) {
+      onMessage("ℹ️ 이 기기(iOS)는 백그라운드 감시를 지원하지 않습니다.", WatchMessageLevel.info);
+      return;
+    }
+
+    // 배터리 최적화 예외 요청 (이미 허용되어 있으면 시스템이 알아서 다이얼로그를 건너뜀)
+    final batteryStatus = await Permission.ignoreBatteryOptimizations.status;
+    if (!batteryStatus.isGranted) {
+      await Permission.ignoreBatteryOptimizations.request();
+    }
+
+    final service = FlutterBackgroundService();
+    if (!await service.isRunning()) {
+      await service.startService();
+    }
+    service.invoke('start_watch', {
+      "studentId": studentId,
+      "studentName": studentName,
+      "pocketNumber": pocketNumber,
+    });
+
+    _isWatching = true;
+    _activePocketNumber = pocketNumber;
+    _statusMessage = "🛡️ 백그라운드에서 감시 중입니다. 화면을 꺼도 계속 감시돼요.";
+    notifyListeners();
+  }
+
+  /// 감시 중일 때 다시 태깅하면 폰을 회수한 것으로 보고 감시를 종료한다.
+  Future<void> _checkOut() async {
+    FlutterBackgroundService().invoke('stop_watch');
+    _isWatching = false;
+    _activePocketNumber = null;
+    _statusMessage = "✅ 폰을 회수했습니다. 감시가 종료되었습니다.";
+    notifyListeners();
+    onMessage("✅ 감시가 종료되었습니다. 수고하셨습니다!", WatchMessageLevel.success);
+  }
+}
diff --git a/lib/function/nfc_tag_writer_controller.dart b/lib/function/nfc_tag_writer_controller.dart
new file mode 100644
index 0000000..bef4605
--- /dev/null
+++ b/lib/function/nfc_tag_writer_controller.dart
@@ -0,0 +1,141 @@
+// 🏷️ (관리자용) NFC 주머니 태그 쓰기 화면의 기능(NFC 세션/서버 통신/상태) 담당 컨트롤러.
+// 실제 스낵바 표시나 텍스트필드 조작은 UI 파일(lib/ui/nfc_tag_writer_screen.dart)의
+// 콜백을 통해서만 이루어진다 — 이 파일엔 위젯 코드가 없다.
+import 'dart:convert';
+import 'dart:typed_data';
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import 'package:nfc_manager/nfc_manager.dart';
+import 'package:nfc_manager/nfc_manager_android.dart';
+import 'package:nfc_manager/ndef_record.dart';
+import 'package:nfc_manager_ndef/nfc_manager_ndef.dart';
+import '../config.dart';
+
+class NfcTagWriterController extends ChangeNotifier {
+  /// (메시지, 색상) — 스낵바로 보여줄 이벤트. UI가 정의해서 넘겨준다.
+  final void Function(String message, bool isError) onMessage;
+
+  /// 태그 쓰기에 성공하면 다음 스티커 번호를 제안한다. UI가 텍스트필드를 갱신한다.
+  final void Function(String nextNumber) onNextNumberSuggested;
+
+  NfcTagWriterController({
+    required this.onMessage,
+    required this.onNextNumberSuggested,
+  });
+
+  bool _isWriting = false;
+  String _statusMessage = "주머니 번호를 입력하고 '쓰기 시작'을 눌러주세요.";
+
+  bool get isWriting => _isWriting;
+  String get statusMessage => _statusMessage;
+
+  @override
+  void dispose() {
+    NfcManager.instance.stopSession();
+    super.dispose();
+  }
+
+  Future<void> startWriteSession(String number) async {
+    if (number.isEmpty) {
+      onMessage("⚠️ 주머니 번호를 입력해주세요.", true);
+      return;
+    }
+    final String pocketLabel = "POCKET_$number";
+
+    bool isAvailable = await NfcManager.instance.isAvailable();
+    if (!isAvailable) {
+      onMessage("❌ NFC가 꺼져있거나 지원되지 않습니다.", true);
+      return;
+    }
+
+    _isWriting = true;
+    _statusMessage = "📡 [$pocketLabel] 쓸 준비 완료! 스티커에 폰 뒷면을 대주세요.";
+    notifyListeners();
+
+    NfcManager.instance.startSession(
+      pollingOptions: {NfcPollingOption.iso14443, NfcPollingOption.iso15693},
+      onDiscovered: (NfcTag tag) async {
+        try {
+          final ndef = Ndef.from(tag);
+          if (ndef == null) {
+            onMessage("❌ 이 태그는 NDEF 쓰기를 지원하지 않는 종류입니다.", true);
+            return;
+          }
+          if (!ndef.isWritable) {
+            onMessage("❌ 이 태그는 쓰기 잠금(read-only) 상태입니다.", true);
+            return;
+          }
+
+          await ndef.write(
+            message: NdefMessage(records: [_createTextRecord(pocketLabel)]),
+          );
+
+          // 🔒 태그 복제 방지: 하드웨어 UID를 서버에 등록해서 이 물리 태그만 [pocketLabel]로 인정되게 한다.
+          final String? tagUid = _getTagUid(tag);
+          if (tagUid != null) {
+            await _registerTagUid(tagUid, pocketLabel);
+          }
+
+          onMessage(
+            tagUid != null
+                ? "✅ [$pocketLabel] 쓰기 + UID 등록 성공!"
+                : "⚠️ [$pocketLabel] 쓰기는 성공했지만 UID를 못 읽어 등록은 안 됐습니다.",
+            tagUid == null,
+          );
+          // 다음 스티커를 연달아 쓰기 편하도록 번호를 자동으로 1 올려준다.
+          final int? n = int.tryParse(number);
+          if (n != null) onNextNumberSuggested((n + 1).toString());
+          _statusMessage = "다음 번호를 확인하고 '쓰기 시작'을 다시 눌러주세요.";
+          notifyListeners();
+        } catch (e) {
+          onMessage("❌ 쓰기 실패: $e", true);
+        } finally {
+          await NfcManager.instance.stopSession();
+          _isWriting = false;
+          notifyListeners();
+        }
+      },
+    );
+  }
+
+  /// 태그의 공장 각인 하드웨어 UID를 16진수 문자열로 반환한다 (쓰기로 바꿀 수 없어 복제 방지 기준으로 씀).
+  String? _getTagUid(NfcTag tag) {
+    final id = NfcTagAndroid.from(tag)?.id;
+    if (id == null || id.isEmpty) return null;
+    return id
+        .map((b) => b.toRadixString(16).padLeft(2, '0'))
+        .join()
+        .toUpperCase();
+  }
+
+  /// 서버에 "이 UID는 이 주머니 번호다"를 등록한다.
+  Future<void> _registerTagUid(String tagUid, String pocketLabel) async {
+    try {
+      await http.post(
+        Uri.parse("$baseUrl/api/pockets/register"),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({"tagUid": tagUid, "pocketNumber": pocketLabel}),
+      );
+    } catch (e) {
+      onMessage("❌ 서버에 UID 등록 실패: $e", true);
+    }
+  }
+
+  /// NFC Forum Text Record Type Definition에 맞춰 "언어코드+텍스트" 페이로드를 만든다.
+  NdefRecord _createTextRecord(String text) {
+    const languageCode = 'en';
+    final languageBytes = utf8.encode(languageCode);
+    final textBytes = utf8.encode(text);
+    final payload = Uint8List.fromList([
+      languageBytes.length, // 상태 바이트: UTF-8 + 언어코드 길이
+      ...languageBytes,
+      ...textBytes,
+    ]);
+    return NdefRecord(
+      typeNameFormat: TypeNameFormat.wellKnown,
+      type: Uint8List.fromList([0x54]), // 'T' = Text Record
+      identifier: Uint8List(0),
+      payload: payload,
+    );
+  }
+}
diff --git a/lib/function/student_dashboard_controller.dart b/lib/function/student_dashboard_controller.dart
new file mode 100644
index 0000000..7971bce
--- /dev/null
+++ b/lib/function/student_dashboard_controller.dart
@@ -0,0 +1,33 @@
+// 🎓 학생 대시보드(마스터 계정 전용 계정 강제 삭제)의 기능(서버 통신/상태) 담당 컨트롤러.
+import 'dart:convert';
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import '../config.dart';
+
+class StudentDashboardController extends ChangeNotifier {
+  bool _isLoading = false;
+  bool get isLoading => _isLoading;
+
+  /// 👑 마스터 계정 전용 회원 삭제 API 호출.
+  Future<(bool success, String message)> deleteUser(String userId) async {
+    _isLoading = true;
+    notifyListeners();
+    final url = Uri.parse('$baseUrl/api/users/delete/$userId');
+
+    try {
+      final response = await http.delete(url);
+      if (response.statusCode == 200) {
+        final responseData = jsonDecode(response.body);
+        return (true, '✅ ${responseData['message']}');
+      } else {
+        final errorData = jsonDecode(response.body);
+        return (false, '❌ 삭제 실패: ${errorData['detail'] ?? '알 수 없는 오류'}');
+      }
+    } catch (e) {
+      return (false, '❌ 서버와 연결할 수 없습니다. (네트워크 에러)');
+    } finally {
+      _isLoading = false;
+      notifyListeners();
+    }
+  }
+}
diff --git a/lib/function/student_management_controller.dart b/lib/function/student_management_controller.dart
new file mode 100644
index 0000000..7e71c20
--- /dev/null
+++ b/lib/function/student_management_controller.dart
@@ -0,0 +1,102 @@
+// 🔐 (마스터 계정용) 학생 계정 및 기기 관리 화면의 기능(서버 통신/상태) 담당 컨트롤러.
+import 'dart:convert';
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import '../config.dart';
+
+class StudentManagementController extends ChangeNotifier {
+  List<dynamic> _students = [];
+  bool _isLoading = true;
+
+  List<dynamic> get students => _students;
+  bool get isLoading => _isLoading;
+
+  Future<void> init() => fetchStudents();
+
+  /// 🌐 서버에서 전체 학생 목록 불러오기. 실패 시 에러 메시지를 반환한다(성공 시 null).
+  Future<String?> fetchStudents() async {
+    _isLoading = true;
+    notifyListeners();
+    try {
+      final response = await http.get(Uri.parse('$baseUrl/api/users'));
+      if (response.statusCode == 200) {
+        final data = jsonDecode(utf8.decode(response.bodyBytes));
+        _students = data['users'] ?? [];
+        _isLoading = false;
+        notifyListeners();
+        return null;
+      }
+      _isLoading = false;
+      notifyListeners();
+      return '데이터 불러오기 실패 (${response.statusCode})';
+    } catch (e) {
+      _isLoading = false;
+      notifyListeners();
+      return '데이터 불러오기 실패: $e';
+    }
+  }
+
+  /// 🌐 서버로 기기 초기화(리셋) 명령 보내기
+  Future<(bool success, String message)> resetDevice(
+    String studentId,
+    String studentName,
+  ) async {
+    try {
+      final response = await http.post(
+        Uri.parse('$baseUrl/api/users/reset'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({"studentId": studentId}),
+      );
+      if (response.statusCode == 200) {
+        await fetchStudents();
+        return (true, '✅ $studentName 학생 기기 초기화 완료!');
+      }
+      return (false, '❌ 초기화 통신 실패');
+    } catch (e) {
+      return (false, '❌ 초기화 통신 실패');
+    }
+  }
+
+  /// 🌐 서버로 계정 완전 삭제 명령 보내기
+  Future<(bool success, String message)> deleteUser(
+    String studentId,
+    String studentName,
+  ) async {
+    try {
+      final response = await http.delete(
+        Uri.parse('$baseUrl/api/users/delete'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({"studentId": studentId}),
+      );
+      if (response.statusCode == 200) {
+        await fetchStudents();
+        return (true, '💥 $studentName 학생의 계정이 영구 삭제되었습니다.');
+      }
+      return (false, '❌ 계정 삭제 통신 실패');
+    } catch (e) {
+      return (false, '❌ 계정 삭제 통신 실패');
+    }
+  }
+
+  /// 🌐 신규 학생 계정 생성
+  Future<(bool success, String message)> createUser(
+    String studentId,
+    String name,
+  ) async {
+    try {
+      final response = await http.post(
+        Uri.parse('$baseUrl/api/users/create'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({"studentId": studentId, "name": name}),
+      );
+      final res = jsonDecode(response.body);
+      if (res['status'] == 'success') {
+        await fetchStudents();
+        return (true, '✅ ${res['message']}');
+      }
+      return (false, '❌ ${res['message']}');
+    } catch (e) {
+      return (false, '❌ 학생 등록 실패 (통신 에러)');
+    }
+  }
+}
diff --git a/lib/function/teacher_attendance_controller.dart b/lib/function/teacher_attendance_controller.dart
new file mode 100644
index 0000000..7ad443f
--- /dev/null
+++ b/lib/function/teacher_attendance_controller.dart
@@ -0,0 +1,301 @@
+// 📋 실시간 출석 현황 화면의 기능(상태/서버 통신/파생 로직) 담당 컨트롤러.
+// UI(lib/ui/teacher_attendance_page.dart)는 이 컨트롤러를 구독해서 화면만 그린다.
+// 이 파일에는 위젯/BuildContext/다이얼로그 코드가 없어야 한다 — 전부 UI 파일 몫.
+import 'dart:async';
+import 'dart:convert';
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import '../config.dart';
+
+// 로그의 'name' 컬럼은 백엔드에서 "학생이름 (주머니정보)" 형태로 합쳐져 저장되어 있어서
+// 이름과 주머니 번호를 분리해서 보여주려면 클라이언트에서 파싱해야 한다.
+final RegExp _logNamePattern = RegExp(r'^(.*?)\s*\(([^)]*)\)$');
+
+class TeacherAttendanceController extends ChangeNotifier {
+  List<dynamic> _roster = []; // 전체 학생 명단 (/api/users)
+  List<dynamic> _logs = []; // 출석 로그 (/api/logs)
+  Map<String, dynamic> _activeViolationsByStudentId = {}; // 무단반출 중인 학생 (/api/violations/active)
+  String? _dismissedAt; // 오늘 가장 최근 하교 처리 시각 (/api/dismissal/latest). 이 시각 이후 기록만 "오늘 출석"으로 표시.
+  String? _attendanceTime; // 선생님이 지정한 자습실 출석시간 "HH:MM" (/api/settings/attendance-time). null이면 미설정.
+  String? _globalPermissionUntil; // 하교(12시간)/반출허용시간설정으로 전체 반출이 허용된 경우 그 만료 시각 (/api/permissions/status). null이면 비활성.
+  Timer? _timer;
+  bool _isLoading = true;
+  bool _isRefreshing = false; // 새로고침 버튼 클릭 시 잠깐 도는 표시용
+  String _filterType = "ALL"; // "ALL", "CHECKED_IN", "ABSENT"
+  bool _disposed = false;
+
+  // ----------------------------------------------------------------
+  // UI가 읽는 공개 상태
+  // ----------------------------------------------------------------
+  bool get isLoading => _isLoading;
+  bool get isRefreshing => _isRefreshing;
+  String get filterType => _filterType;
+  String? get attendanceTime => _attendanceTime;
+  String? get globalPermissionUntil => _globalPermissionUntil;
+
+  void _safeNotify() {
+    if (!_disposed) notifyListeners();
+  }
+
+  void init() {
+    fetchAll();
+    _timer = Timer.periodic(const Duration(seconds: 3), (timer) => fetchAll());
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    _timer?.cancel();
+    super.dispose();
+  }
+
+  Future<void> manualRefresh() async {
+    _isRefreshing = true;
+    _safeNotify();
+    await fetchAll();
+    _isRefreshing = false;
+    _safeNotify();
+  }
+
+  Future<void> fetchAll() async {
+    try {
+      final results = await Future.wait([
+        http.get(Uri.parse('$baseUrl/api/users')),
+        http.get(Uri.parse('$baseUrl/api/logs')),
+        http.get(Uri.parse('$baseUrl/api/violations/active')),
+        http.get(Uri.parse('$baseUrl/api/dismissal/latest')),
+        http.get(Uri.parse('$baseUrl/api/settings/attendance-time')),
+        http.get(Uri.parse('$baseUrl/api/permissions/status')),
+      ]);
+
+      final usersRes = results[0];
+      final logsRes = results[1];
+      final violationsRes = results[2];
+      final dismissalRes = results[3];
+      final attendanceTimeRes = results[4];
+      final permissionStatusRes = results[5];
+
+      if (usersRes.statusCode == 200 && logsRes.statusCode == 200) {
+        final usersData = jsonDecode(utf8.decode(usersRes.bodyBytes));
+        final logsData = jsonDecode(utf8.decode(logsRes.bodyBytes));
+
+        Map<String, dynamic> activeViolations = {};
+        if (violationsRes.statusCode == 200) {
+          final violationsData = jsonDecode(utf8.decode(violationsRes.bodyBytes));
+          for (final v in (violationsData['violations'] ?? [])) {
+            activeViolations[v['student_id'].toString()] = v;
+          }
+        }
+
+        String? dismissedAt;
+        if (dismissalRes.statusCode == 200) {
+          final dismissalData = jsonDecode(utf8.decode(dismissalRes.bodyBytes));
+          dismissedAt = dismissalData['dismissedAt'];
+        }
+
+        String? attendanceTime;
+        if (attendanceTimeRes.statusCode == 200) {
+          final attendanceTimeData =
+              jsonDecode(utf8.decode(attendanceTimeRes.bodyBytes));
+          attendanceTime = attendanceTimeData['attendanceTime'];
+        }
+
+        String? globalPermissionUntil;
+        if (permissionStatusRes.statusCode == 200) {
+          final permissionStatusData =
+              jsonDecode(utf8.decode(permissionStatusRes.bodyBytes));
+          if (permissionStatusData['active'] == true) {
+            globalPermissionUntil = permissionStatusData['permittedUntil'];
+          }
+        }
+
+        _roster = usersData['users'] ?? [];
+        _logs = logsData['logs'] ?? [];
+        _activeViolationsByStudentId = activeViolations;
+        _dismissedAt = dismissedAt;
+        _attendanceTime = attendanceTime;
+        _globalPermissionUntil = globalPermissionUntil;
+        _isLoading = false;
+        _safeNotify();
+      } else {
+        _isLoading = false;
+        _safeNotify();
+      }
+    } catch (e) {
+      _isLoading = false;
+      _safeNotify();
+    }
+  }
+
+  /// 🏫 하교 처리: 전체 반출 허용 + 오늘 출석 표시 기준선을 지금 시각으로 옮긴다.
+  Future<String> dismissAll() async {
+    try {
+      final response = await http.post(Uri.parse('$baseUrl/api/dismiss'));
+      final result = jsonDecode(utf8.decode(response.bodyBytes));
+      await fetchAll();
+      return result['message'] ?? '하교 처리되었습니다.';
+    } catch (e) {
+      return '❌ 하교 처리 실패: $e';
+    }
+  }
+
+  /// 🚨 선생님이 특정 학생에게 지금부터 N분간 반출을 허용한다.
+  Future<String> allowRemoval(String studentId, int minutes) async {
+    try {
+      final response = await http.post(
+        Uri.parse('$baseUrl/api/violations/allow'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({"studentId": studentId, "minutes": minutes}),
+      );
+      final result = jsonDecode(utf8.decode(response.bodyBytes));
+      await fetchAll();
+      return result['message'] ?? '처리되었습니다.';
+    } catch (e) {
+      return '❌ 반출 허용 실패: $e';
+    }
+  }
+
+  /// ⏰ 지금부터 N분간 전체 학생의 반출을 자동으로 허용한다 (쉬는시간 등).
+  Future<String> setPermissionWindow(int minutes) async {
+    try {
+      final response = await http.post(
+        Uri.parse('$baseUrl/api/permissions/window'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({"minutes": minutes}),
+      );
+      final result = jsonDecode(utf8.decode(response.bodyBytes));
+      await fetchAll();
+      return result['message'] ?? '처리되었습니다.';
+    } catch (e) {
+      return '❌ 설정 실패: $e';
+    }
+  }
+
+  /// ⏰ 자습실 출석시간(기준 시각)을 지정한다. 이 시각 이후 태깅한 학생만 "출석 완료"로 강조 표시된다.
+  Future<String> setAttendanceTime(String time) async {
+    try {
+      final response = await http.post(
+        Uri.parse('$baseUrl/api/settings/attendance-time'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({"time": time}),
+      );
+      final result = jsonDecode(utf8.decode(response.bodyBytes));
+      await fetchAll();
+      return result['message'] ?? '처리되었습니다.';
+    } catch (e) {
+      return '❌ 출석시간 설정 실패: $e';
+    }
+  }
+
+  /// 🧪 테스트용: 하교(12시간)/반출 허용 시간 설정 등으로 켜져 있는 허용 시간대를 즉시 해제한다.
+  Future<String> resetTestPermissions() async {
+    try {
+      final response = await http.post(
+        Uri.parse('$baseUrl/api/debug/reset-permissions'),
+      );
+      final result = jsonDecode(utf8.decode(response.bodyBytes));
+      await fetchAll();
+      return result['message'] ?? '처리되었습니다.';
+    } catch (e) {
+      return '❌ 초기화 실패: $e';
+    }
+  }
+
+  void setFilter(String type) {
+    _filterType = type;
+    _safeNotify();
+  }
+
+  // ----------------------------------------------------------------
+  // 파생 로직 (출석 상태 계산)
+  // ----------------------------------------------------------------
+
+  /// "오늘 출석"의 기준선. 하교 처리를 했다면 그 시각 이후, 안 했다면 오늘 자정부터.
+  Map<String, Map<String, String>> get _todaysCheckInsByStudentId {
+    // "YYYY-MM-DD HH:MM:SS" 형태의 문자열끼리는 그대로 비교해도 시간 순서가 맞는다.
+    final String cutoff =
+        _dismissedAt ??
+        '${DateTime.now().toIso8601String().substring(0, 10)} 00:00:00';
+    final Map<String, Map<String, String>> result = {};
+
+    for (final log in _logs) {
+      final String time = log['time']?.toString() ?? '';
+      if (time.isEmpty || time.compareTo(cutoff) <= 0) {
+        continue; // 하교 처리 시각(또는 오늘 자정) 이전 기록이면 무시
+      }
+
+      final String studentId = log['student_id']?.toString() ?? '';
+      if (studentId.isEmpty) continue;
+
+      // 이미 더 최신 기록을 찾았다면(로그는 최신순 정렬) 건너뛴다.
+      if (result.containsKey(studentId)) continue;
+
+      final String rawName = log['name']?.toString() ?? '';
+      final match = _logNamePattern.firstMatch(rawName);
+      result[studentId] = {
+        'name': match != null ? match.group(1)! : rawName,
+        'pocketNumber': match != null ? match.group(2)! : '주머니 미지정',
+        'time': time,
+      };
+    }
+    return result;
+  }
+
+  /// 지금까지(오늘 이전 포함) 단 한 번이라도 태깅한 적 있는 학생 학번 집합.
+  /// (오늘 미제출인 학생 중에서도 "한 번도 태깅 안 해본 애"를 구분하기 위함)
+  Set<String> get _everCheckedInStudentIds {
+    final Set<String> ids = {};
+    for (final log in _logs) {
+      final String studentId = log['student_id']?.toString() ?? '';
+      if (studentId.isNotEmpty) ids.add(studentId);
+    }
+    return ids;
+  }
+
+  /// ⏰ 태깅 시간과 지정된 자습실 출석시간을 비교해 'NONE' / 'PENDING' / 'COMPLETE'를 반환한다.
+  /// - NONE: 아직 태깅 안 함
+  /// - PENDING: 태깅은 했지만 지정된 출석시간 이전이라 아직 "출석 완료"로 안 침
+  /// - COMPLETE: 출석시간 미지정이거나, 지정된 출석시간 이후에 태깅함
+  String _computeAttendanceStatus(String? checkInTime) {
+    if (checkInTime == null) return 'NONE';
+    if (_attendanceTime == null) return 'COMPLETE';
+
+    final String todayStr = DateTime.now().toIso8601String().substring(0, 10);
+    final String cutoff = '$todayStr $_attendanceTime:00';
+    return checkInTime.compareTo(cutoff) >= 0 ? 'COMPLETE' : 'PENDING';
+  }
+
+  List<Map<String, dynamic>> get combinedStudentStatus {
+    final checkIns = _todaysCheckInsByStudentId;
+    final everCheckedIn = _everCheckedInStudentIds;
+    return _roster.map((u) {
+      final String id = u['id']?.toString() ?? '';
+      final checkIn = checkIns[id];
+      final violation = _activeViolationsByStudentId[id];
+      final String attendanceStatus = _computeAttendanceStatus(checkIn?['time']);
+      return {
+        'studentId': id,
+        'studentName': u['name']?.toString() ?? '',
+        'isCheckedIn': checkIn != null,
+        'pocketNumber': checkIn?['pocketNumber'],
+        'checkInTime': checkIn?['time'],
+        'attendanceStatus': attendanceStatus,
+        'isAttendanceComplete': attendanceStatus == 'COMPLETE',
+        'hasEverCheckedIn': everCheckedIn.contains(id),
+        'hasActiveViolation': violation != null,
+        'violationPocket': violation?['pocket_number'],
+        'violationTime': violation?['time'],
+      };
+    }).toList();
+  }
+
+  List<Map<String, dynamic>> get filteredStudents {
+    final all = combinedStudentStatus;
+    if (_filterType == "CHECKED_IN") {
+      return all.where((s) => s['isAttendanceComplete'] == true).toList();
+    } else if (_filterType == "ABSENT") {
+      return all.where((s) => s['isAttendanceComplete'] == false).toList();
+    }
+    return all;
+  }
+}
diff --git a/lib/function/teacher_register_controller.dart b/lib/function/teacher_register_controller.dart
new file mode 100644
index 0000000..d8be488
--- /dev/null
+++ b/lib/function/teacher_register_controller.dart
@@ -0,0 +1,51 @@
+// 👨‍🏫 교사 회원가입 화면의 기능(서버 통신/상태) 담당 컨트롤러.
+import 'dart:convert';
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import '../config.dart';
+
+class TeacherRegisterController extends ChangeNotifier {
+  bool _isLoading = false;
+  bool get isLoading => _isLoading;
+
+  /// (성공여부, 메시지)를 반환한다 — UI가 성공 시에만 이전 화면으로 돌아간다.
+  Future<(bool success, String message)> registerTeacher({
+    required String id,
+    required String password,
+    required String name,
+    required String secretCode,
+  }) async {
+    // 💡 테스트용 고유값 (실제 디바이스 UUID 연동 로직이 있다면 그걸 넣으세요)
+    final String dummyUuid = "TEACHER_PHONE_$id";
+
+    _isLoading = true;
+    notifyListeners();
+    try {
+      final response = await http.post(
+        Uri.parse('$baseUrl/api/users/register-teacher'),
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({
+          "teacherId": id,
+          "password": password,
+          "name": name,
+          "secretCode": secretCode,
+          "deviceUuid": dummyUuid,
+        }),
+      );
+
+      final res = jsonDecode(response.body);
+
+      if (response.statusCode == 200 && res['status'] == 'success') {
+        return (true, '✅ ${res['message']}');
+      } else {
+        String errorMsg = res['detail'] ?? res['message'] ?? '회원가입에 실패했습니다.';
+        return (false, '❌ $errorMsg');
+      }
+    } catch (e) {
+      return (false, '❌ 서버와 통신에 실패했습니다.');
+    } finally {
+      _isLoading = false;
+      notifyListeners();
+    }
+  }
+}
diff --git a/lib/function/teacher_student_management_controller.dart b/lib/function/teacher_student_management_controller.dart
new file mode 100644
index 0000000..02ff12a
--- /dev/null
+++ b/lib/function/teacher_student_management_controller.dart
@@ -0,0 +1,67 @@
+// 👥 교사용 학생 계정 관리 화면의 기능(서버 통신/상태) 담당 컨트롤러.
+import 'dart:convert';
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import '../config.dart';
+
+class TeacherStudentManagementController extends ChangeNotifier {
+  bool _isWorking = false;
+  bool get isWorking => _isWorking;
+
+  /// ➕ 학생 계정 추가. (성공여부, 메시지)를 반환한다 — UI가 성공했을 때만 입력칸을 비운다.
+  Future<(bool success, String message)> addStudentAccount({
+    required String studentId,
+    required String name,
+    required String password,
+  }) async {
+    _isWorking = true;
+    notifyListeners();
+    try {
+      final url = Uri.parse('$baseUrl/api/users/register-student');
+      final response = await http.post(
+        url,
+        headers: {"Content-Type": "application/json"},
+        body: jsonEncode({
+          "studentId": studentId,
+          "name": name,
+          "password": password,
+        }),
+      );
+      final result = jsonDecode(utf8.decode(response.bodyBytes));
+
+      if (response.statusCode == 200 || response.statusCode == 201) {
+        return (true, '✅ 계정 생성 완료: ${result['message'] ?? '성공'}');
+      } else {
+        return (false, '❌ 생성 실패: ${result['message'] ?? '오류 발생'}');
+      }
+    } catch (e) {
+      return (false, '🚨 네트워크 에러: $e');
+    } finally {
+      _isWorking = false;
+      notifyListeners();
+    }
+  }
+
+  /// ❌ 학생 계정 삭제.
+  Future<(bool success, String message)> deleteStudentAccount(
+    String studentId,
+  ) async {
+    _isWorking = true;
+    notifyListeners();
+    final url = Uri.parse('$baseUrl/api/users/delete/$studentId');
+    try {
+      final response = await http.delete(url);
+      if (response.statusCode == 200) {
+        final resData = jsonDecode(utf8.decode(response.bodyBytes));
+        return (true, '✅ ${resData['message']}');
+      } else {
+        return (false, '❌ 삭제 실패하였습니다.');
+      }
+    } catch (e) {
+      return (false, '❌ 서버 에러 발생');
+    } finally {
+      _isWorking = false;
+      notifyListeners();
+    }
+  }
+}
diff --git a/lib/main_client_app.dart b/lib/main_client_app.dart
index 33ddd47..98240bf 100644
--- a/lib/main_client_app.dart
+++ b/lib/main_client_app.dart
@@ -7,7 +7,7 @@ import 'package:firebase_core/firebase_core.dart';
 import 'firebase_options.dart';
 import 'config.dart';
 import 'pocket_watch_service.dart';
-import 'screens/login_screen.dart';
+import 'ui/login_screen.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
diff --git a/lib/nfc_poccket_checkin_screen.dart b/lib/nfc_poccket_checkin_screen.dart
deleted file mode 100644
index 9e90c0e..0000000
--- a/lib/nfc_poccket_checkin_screen.dart
+++ /dev/null
@@ -1,397 +0,0 @@
-// 📲 자습실 NFC 출석체크 화면. 태그 인식→출석 전송 후, 배터리 최적화 예외를 요청하고
-// pocket_watch_service의 백그라운드 감시를 시작/종료(재태깅 시 체크아웃)하는 역할을 한다.
-import 'dart:async';
-import 'dart:convert';
-import 'dart:io' show Platform;
-import 'package:flutter/foundation.dart' show kIsWeb;
-import 'package:flutter/material.dart';
-import 'package:flutter_background_service/flutter_background_service.dart';
-import 'package:http/http.dart' as http;
-import 'package:nfc_manager/nfc_manager.dart';
-import 'package:nfc_manager/nfc_manager_android.dart';
-import 'package:nfc_manager_ndef/nfc_manager_ndef.dart';
-import 'package:permission_handler/permission_handler.dart';
-import 'config.dart' show baseUrl;
-
-class NfcPocketCheckInScreen extends StatefulWidget {
-  final String studentId; // 로그인된 학생 학번 (예: "2061")
-  final String studentName; // 로그인된 학생 이름 (예: "시후")
-
-  const NfcPocketCheckInScreen({
-    super.key,
-    required this.studentId,
-    required this.studentName,
-  });
-
-  @override
-  State<NfcPocketCheckInScreen> createState() => _NfcPocketCheckInScreenState();
-}
-
-class _NfcPocketCheckInScreenState extends State<NfcPocketCheckInScreen> {
-  bool _isProcessing = false; // 중복 태깅 및 연타 방지 플래그
-  bool _isWatching = false; // 백그라운드 조도 센서 감시가 진행 중인지 여부
-  String _statusMessage = "주머니의 NFC 스티커에 폰 뒷면을 대어주세요.";
-  String? _activePocketNumber;
-
-  StreamSubscription<Map<String, dynamic>?>? _violationSub;
-  StreamSubscription<Map<String, dynamic>?>? _checkedOutSub;
-  bool _isDialogOpen = false; // 출석/위반 팝업이 겹쳐서 뜨는 것을 막기 위한 플래그
-
-  bool get _watchServiceSupported => !kIsWeb && Platform.isAndroid;
-
-  @override
-  void initState() {
-    super.initState();
-    _startNfcSession();
-    if (_watchServiceSupported) {
-      // 화면이 열려있는 동안은 실시간으로 위반 알림을 받아 팝업을 띄운다.
-      // 무단 반출이 한 번 감지되면 "신뢰된 감시 세션"은 끝난 것으로 보고,
-      // 다음 태깅은 체크아웃이 아니라 새 출석(재출석)으로 처리되도록 감시 상태를 해제한다.
-      _violationSub = FlutterBackgroundService().on('violation_detected').listen((
-        event,
-      ) {
-        if (!mounted) return;
-        setState(() => _isWatching = false);
-        _showViolationDialog(event?['pocketNumber']?.toString());
-      });
-      // 🏫 하교 처리 등으로 반출이 허용된 상태에서 폰을 꺼내면, 위반이 아니라 정상 회수로 처리된다.
-      _checkedOutSub = FlutterBackgroundService().on('checked_out').listen((event) {
-        if (!mounted) return;
-        setState(() {
-          _isWatching = false;
-          _activePocketNumber = null;
-          _statusMessage = "✅ 폰을 회수했습니다. 수고하셨습니다!";
-        });
-        _showSnackBar("✅ 폰이 정상적으로 회수되었습니다.", Colors.green);
-      });
-    }
-  }
-
-  @override
-  void dispose() {
-    // 화면을 나갈 때 NFC 감지만 종료. 백그라운드 감시 서비스는 화면과 무관하게 계속 동작해야 하므로 건드리지 않는다.
-    NfcManager.instance.stopSession();
-    _violationSub?.cancel();
-    _checkedOutSub?.cancel();
-    super.dispose();
-  }
-
-  /// 📡 NFC 감지 세션 시작
-  void _startNfcSession() async {
-    bool isAvailable = await NfcManager.instance.isAvailable();
-    if (!isAvailable) {
-      setState(() {
-        _statusMessage = "❌ 이 스마트폰은 NFC 기능이 꺼져있거나 지원되지 않습니다.";
-      });
-      return;
-    }
-
-    NfcManager.instance.startSession(
-      pollingOptions: {NfcPollingOption.iso14443, NfcPollingOption.iso15693},
-      onDiscovered: (NfcTag tag) async {
-        if (_isProcessing) return; // 이미 처리 중이면 연속 태그 무시 (쿨다운)
-
-        // 이미 감시 중일 때 다시 태깅하면 "폰 회수(체크아웃)"로 처리한다.
-        if (_isWatching) {
-          await _checkOut();
-          return;
-        }
-
-        setState(() {
-          _isProcessing = true;
-          _statusMessage = "⏳ 태그 인식 완료! 서버에 출석 전송 중...";
-        });
-
-        try {
-          // 1. NFC 태그에서 주머니 번호 데이터 읽기
-          Ndef? ndef = Ndef.from(tag);
-          String rawPocketData = "";
-
-          if (ndef != null && ndef.cachedMessage != null) {
-            for (var record in ndef.cachedMessage!.records) {
-              rawPocketData += String.fromCharCodes(record.payload);
-            }
-          }
-
-          // 텍스트 헤더 정리 (예: "\x02enPOCKET_17" -> "POCKET_17")
-          String cleanPocketNumber = "POCKET_UNKNOWN";
-          if (rawPocketData.contains("POCKET_")) {
-            int index = rawPocketData.indexOf("POCKET_");
-            cleanPocketNumber = rawPocketData.substring(index).trim();
-          } else if (rawPocketData.isNotEmpty) {
-            cleanPocketNumber = rawPocketData.trim();
-          }
-
-          // 2. 파이썬 서버로 출석 정보 보내기 (복제 방지용 태그 UID도 함께 전송)
-          await _sendAttendanceToBackend(cleanPocketNumber, tagUid: _getTagUid(tag));
-        } catch (e) {
-          _showSnackBar("❌ 태그 읽기 실패: $e", Colors.red);
-        } finally {
-          // 3초 후 연타 방지 해제 (쿨다운)
-          await Future.delayed(const Duration(seconds: 3));
-          if (mounted) {
-            setState(() => _isProcessing = false);
-          }
-        }
-      },
-    );
-  }
-
-  /// 태그의 공장 각인 하드웨어 UID를 16진수 문자열로 반환한다 (쓰기로 바꿀 수 없어 복제 방지 기준으로 씀).
-  String? _getTagUid(NfcTag tag) {
-    final id = NfcTagAndroid.from(tag)?.id;
-    if (id == null || id.isEmpty) return null;
-    return id.map((b) => b.toRadixString(16).padLeft(2, '0')).join().toUpperCase();
-  }
-
-  /// 🚚 파이썬 백엔드로 출석 데이터 HTTP POST 전송
-  Future<void> _sendAttendanceToBackend(
-    String pocketNumber, {
-    String? tagUid,
-  }) async {
-    final url = Uri.parse("$baseUrl/attendance");
-
-    try {
-      final response = await http.post(
-        url,
-        headers: {"Content-Type": "application/json"},
-        body: jsonEncode({
-          "studentId": widget.studentId,
-          "studentName": widget.studentName,
-          "pocketNumber": pocketNumber, // 주머니 번호 전달
-          "tagUid": tagUid, // 🔒 서버가 태그 진위를 대조할 하드웨어 UID
-        }),
-      );
-
-      if (response.statusCode == 200) {
-        final result = jsonDecode(utf8.decode(response.bodyBytes));
-        if (result["status"] == "success") {
-          _showSuccessDialog(pocketNumber);
-          await _startBackgroundWatch(pocketNumber);
-        } else {
-          _showSnackBar("⚠️ 출석 실패: ${result['message']}", Colors.orange);
-        }
-      } else {
-        _showSnackBar("🚨 서버 에러 (코드: ${response.statusCode})", Colors.red);
-      }
-    } catch (e) {
-      _showSnackBar("❌ 서버 연결 실패: $e", Colors.red);
-    }
-  }
-
-  // -----------------------------------------------------------------------
-  // 🛡️ 주머니 제출 모드: 화면이 꺼져도 백그라운드 서비스가 조도 센서로 감시
-  // -----------------------------------------------------------------------
-
-  /// NFC 태깅 성공 직후 호출. 배터리 최적화 예외를 한 번 요청한 뒤 백그라운드 감시 서비스를 시작한다.
-  Future<void> _startBackgroundWatch(String pocketNumber) async {
-    if (!_watchServiceSupported) {
-      _showSnackBar("ℹ️ 이 기기(iOS)는 백그라운드 감시를 지원하지 않습니다.", Colors.blueGrey);
-      return;
-    }
-
-    // 배터리 최적화 예외 요청 (이미 허용되어 있으면 시스템이 알아서 다이얼로그를 건너뜀)
-    final batteryStatus = await Permission.ignoreBatteryOptimizations.status;
-    if (!batteryStatus.isGranted) {
-      await Permission.ignoreBatteryOptimizations.request();
-    }
-
-    final service = FlutterBackgroundService();
-    if (!await service.isRunning()) {
-      await service.startService();
-    }
-    service.invoke('start_watch', {
-      "studentId": widget.studentId,
-      "studentName": widget.studentName,
-      "pocketNumber": pocketNumber,
-    });
-
-    setState(() {
-      _isWatching = true;
-      _activePocketNumber = pocketNumber;
-      _statusMessage = "🛡️ 백그라운드에서 감시 중입니다. 화면을 꺼도 계속 감시돼요.";
-    });
-  }
-
-  /// 감시 중일 때 다시 태깅하면 폰을 회수한 것으로 보고 감시를 종료한다.
-  Future<void> _checkOut() async {
-    FlutterBackgroundService().invoke('stop_watch');
-    setState(() {
-      _isWatching = false;
-      _activePocketNumber = null;
-      _statusMessage = "✅ 폰을 회수했습니다. 감시가 종료되었습니다.";
-    });
-    _showSnackBar("✅ 감시가 종료되었습니다. 수고하셨습니다!", Colors.green);
-  }
-
-  /// 이미 떠 있는 팝업(출석 완료/무단반출 감지)이 있으면 새 팝업을 띄우기 전에 먼저 닫는다.
-  /// (태깅→반출→재태깅이 빠르게 반복되면 팝업이 여러 개 겹쳐 쌓이는 것을 방지)
-  void _closeAnyOpenDialog() {
-    if (_isDialogOpen && mounted) {
-      Navigator.of(context, rootNavigator: true).pop();
-    }
-    _isDialogOpen = false;
-  }
-
-  void _showViolationDialog(String? pocketNumber) {
-    _closeAnyOpenDialog();
-    _isDialogOpen = true;
-    showDialog(
-      context: context,
-      builder: (context) => AlertDialog(
-        backgroundColor: Colors.red[50],
-        title: const Text(
-          "🚨 무단 반출 감지",
-          style: TextStyle(color: Colors.red, fontWeight: FontWeight.bold),
-        ),
-        content: Text(
-          "[${pocketNumber ?? _activePocketNumber}] 주머니에서 휴대폰이 꺼내진 것으로 감지되었습니다.\n담당 선생님께 알림이 전송되었습니다.",
-        ),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(context),
-            child: const Text("확인"),
-          ),
-        ],
-      ),
-    ).then((_) => _isDialogOpen = false);
-  }
-
-  /// 🎊 출석 성공 알림창
-  void _showSuccessDialog(String pocketNumber) {
-    _closeAnyOpenDialog();
-    _isDialogOpen = true;
-    showDialog(
-      context: context,
-      builder: (context) => AlertDialog(
-        title: const Text("🎉 자습실 출석 완료!"),
-        content: Text(
-          "${widget.studentName} 학생!\n[$pocketNumber] 주머니 출석이 확인되었습니다.\n\n폰을 주머니에 쏙 넣고 자습에 집중해 주세요! ✏️",
-        ),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(context),
-            child: const Text("확인"),
-          ),
-        ],
-      ),
-    ).then((_) => _isDialogOpen = false);
-  }
-
-  void _showSnackBar(String text, Color color) {
-    ScaffoldMessenger.of(
-      context,
-    ).showSnackBar(SnackBar(content: Text(text), backgroundColor: color));
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    if (_isWatching) {
-      return _buildPocketWatchScreen();
-    }
-
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text(
-          "자습실 NFC 출석체크",
-          style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
-        ),
-        backgroundColor: const Color.fromARGB(255, 48, 48, 52),
-      ),
-      body: Center(
-        child: Padding(
-          padding: const EdgeInsets.all(24.0),
-          child: Column(
-            mainAxisAlignment: MainAxisAlignment.center,
-            children: [
-              // NFC 애니메이션 아이콘
-              Icon(
-                _isProcessing ? Icons.sync : Icons.nfc,
-                size: 100,
-                color: _isProcessing ? Colors.orange : Colors.blueAccent,
-              ),
-              const SizedBox(height: 30),
-
-              // 상태 메시지 표시
-              Text(
-                _statusMessage,
-                textAlign: TextAlign.center,
-                style: TextStyle(
-                  fontSize: 18,
-                  fontWeight: FontWeight.bold,
-                  color: _isProcessing ? Colors.orange : Colors.black87,
-                ),
-              ),
-              const SizedBox(height: 15),
-
-              const Text(
-                "자기 주머니 번호 숫자에 폰 뒷면을 '톡' 대면\n자동으로 출석 처리됩니다.",
-                textAlign: TextAlign.center,
-                style: TextStyle(color: Colors.grey, fontSize: 14),
-              ),
-            ],
-          ),
-        ),
-      ),
-    );
-  }
-
-  /// 💳 삼성페이 결제창 느낌의 전체화면 "주머니 제출 모드" 안내 UI
-  /// (실제 감시 로직은 pocket_watch_service.dart의 백그라운드 서비스가 담당하므로,
-  ///  이 화면은 상태를 보여주고 화면을 꺼도 된다는 것만 안내한다.)
-  Widget _buildPocketWatchScreen() {
-    return Scaffold(
-      backgroundColor: const Color(0xFF0B1120),
-      body: SafeArea(
-        child: Padding(
-          padding: const EdgeInsets.all(32.0),
-          child: Column(
-            mainAxisAlignment: MainAxisAlignment.center,
-            children: [
-              Container(
-                width: 160,
-                height: 160,
-                decoration: BoxDecoration(
-                  shape: BoxShape.circle,
-                  color: Colors.greenAccent.withValues(alpha: 0.15),
-                  border: Border.all(color: Colors.greenAccent, width: 3),
-                ),
-                child: const Icon(
-                  Icons.shield_rounded,
-                  size: 72,
-                  color: Colors.greenAccent,
-                ),
-              ),
-              const SizedBox(height: 40),
-              Text(
-                _activePocketNumber ?? "",
-                style: const TextStyle(
-                  color: Colors.white54,
-                  fontSize: 14,
-                  letterSpacing: 2,
-                ),
-              ),
-              const SizedBox(height: 12),
-              Text(
-                _statusMessage,
-                textAlign: TextAlign.center,
-                style: const TextStyle(
-                  color: Colors.white,
-                  fontSize: 20,
-                  fontWeight: FontWeight.bold,
-                  height: 1.4,
-                ),
-              ),
-              const SizedBox(height: 8),
-              const Text(
-                "📴 화면을 꺼도 감시는 계속됩니다.\n알림바에서 상태를 확인할 수 있어요.\n(폰을 꺼내 다시 태깅하면 반출 처리됩니다)",
-                textAlign: TextAlign.center,
-                style: TextStyle(color: Colors.white38, fontSize: 13),
-              ),
-            ],
-          ),
-        ),
-      ),
-    );
-  }
-}
diff --git a/lib/screens/admin_dashboard.dart b/lib/screens/admin_dashboard.dart
deleted file mode 100644
index 7d2d7b2..0000000
--- a/lib/screens/admin_dashboard.dart
+++ /dev/null
@@ -1,154 +0,0 @@
-// 🛠️ 시스템 관리자 대시보드. 출석 DB 전체 초기화 기능만 담당한다.
-import 'package:flutter/material.dart';
-import 'package:http/http.dart' as http;
-import '../config.dart';
-import 'login_screen.dart';
-
-// ==========================================
-// 🛠️ 5. 관리자 대시보드 (DB 초기화 암호 파라미터 보정 완료)
-// ==========================================
-class AdminDashboard extends StatefulWidget {
-  const AdminDashboard({super.key});
-
-  @override
-  State<AdminDashboard> createState() => _AdminDashboardState();
-}
-
-class _AdminDashboardState extends State<AdminDashboard> {
-  bool _isLoading = false;
-
-  Future<void> resetDatabase() async {
-    setState(() => _isLoading = true);
-
-    // 🆕 백엔드 보안 규칙에 맞추어 초기화 토큰 비밀번호 파라미터(?password=...)를 연동 주소에 매칭했습니다.
-    final url = Uri.parse('$baseUrl/reset-db?password=adminreset2010');
-
-    try {
-      final response = await http.get(url);
-
-      if (response.statusCode == 200) {
-        if (!mounted) return;
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(
-            content: Text('💥 DB가 깔끔하게 초기화되었습니다! (출석 번호 1번부터 시작)'),
-          ),
-        );
-      } else {
-        if (!mounted) return;
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(
-            content: Text('❌ 초기화 실패: 서버 권한 오류 (${response.statusCode})'),
-          ),
-        );
-      }
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('❌ 네트워크 에러: 서버와 연결할 수 없습니다.')),
-      );
-    } finally {
-      if (mounted) setState(() => _isLoading = false);
-    }
-  }
-
-  void _showResetConfirmDialog() {
-    showDialog(
-      context: context,
-      builder: (BuildContext dialogContext) {
-        return AlertDialog(
-          title: const Text(
-            '⚠️ DB 초기화 경고',
-            style: TextStyle(color: Colors.red, fontWeight: FontWeight.bold),
-          ),
-          content: const Text(
-            '모든 학생의 출석 및 휴대폰 제출 데이터가 영구적으로 삭제됩니다.\n\n정말 초기화하시겠습니까?',
-          ),
-          actions: [
-            TextButton(
-              onPressed: () => Navigator.pop(dialogContext),
-              child: const Text('취소', style: TextStyle(color: Colors.grey)),
-            ),
-            ElevatedButton(
-              style: ElevatedButton.styleFrom(backgroundColor: Colors.red),
-              onPressed: () {
-                Navigator.pop(dialogContext);
-                resetDatabase();
-              },
-              child: const Text(
-                '초기화 실행',
-                style: TextStyle(color: Colors.white),
-              ),
-            ),
-          ],
-        );
-      },
-    );
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('🛠️ 관리자 시스템'),
-        backgroundColor: Colors.orange,
-        foregroundColor: Colors.white,
-        actions: [
-          IconButton(
-            icon: const Icon(Icons.logout),
-            onPressed: () => Navigator.pushReplacement(
-              context,
-              MaterialPageRoute(builder: (context) => const LoginScreen()),
-            ),
-          ),
-        ],
-      ),
-      body: Center(
-        child: Padding(
-          padding: const EdgeInsets.all(24.0),
-          child: Column(
-            mainAxisAlignment: MainAxisAlignment.center,
-            children: [
-              const Icon(
-                Icons.admin_panel_settings,
-                size: 100,
-                color: Colors.orange,
-              ),
-              const SizedBox(height: 20),
-              const Text(
-                '데이터베이스 관리',
-                style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold),
-              ),
-              const SizedBox(height: 40),
-
-              _isLoading
-                  ? const CircularProgressIndicator(color: Colors.red)
-                  : SizedBox(
-                      width: double.infinity,
-                      height: 60,
-                      child: ElevatedButton.icon(
-                        style: ElevatedButton.styleFrom(
-                          backgroundColor: Colors.red[50],
-                          foregroundColor: Colors.red,
-                          side: const BorderSide(color: Colors.red, width: 2),
-                          shape: RoundedRectangleBorder(
-                            borderRadius: BorderRadius.circular(12),
-                          ),
-                        ),
-                        icon: const Icon(Icons.delete_forever, size: 28),
-                        label: const Text(
-                          '모든 출석 데이터 초기화',
-                          style: TextStyle(
-                            fontSize: 18,
-                            fontWeight: FontWeight.bold,
-                          ),
-                        ),
-                        onPressed: _showResetConfirmDialog,
-                      ),
-                    ),
-            ],
-          ),
-        ),
-      ),
-    );
-  }
-}
diff --git a/lib/screens/change_password_screen.dart b/lib/screens/change_password_screen.dart
index 49e68f8..ce9360d 100644
--- a/lib/screens/change_password_screen.dart
+++ b/lib/screens/change_password_screen.dart
@@ -3,7 +3,7 @@ import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:http/http.dart' as http;
 import '../config.dart';
-import 'login_screen.dart';
+import '../ui/login_screen.dart';
 
 // 💡 main.dart 파일의 최하단(다른 클래스 중괄호 밖)에 붙여넣으세요.
 class ChangePasswordScreen extends StatefulWidget {
diff --git a/lib/screens/login_screen.dart b/lib/screens/login_screen.dart
deleted file mode 100644
index a4c9be4..0000000
--- a/lib/screens/login_screen.dart
+++ /dev/null
@@ -1,551 +0,0 @@
-// 🔑 로그인 화면. 학번/비밀번호 인증, 최초 로그인 비밀번호 변경, 권한(학생/교사/관리자)별 화면 분기를 담당한다.
-import 'dart:convert';
-import 'package:flutter/foundation.dart' show kIsWeb;
-import 'package:flutter/material.dart';
-import 'package:http/http.dart' as http;
-import 'package:firebase_messaging/firebase_messaging.dart';
-import '../config.dart';
-import 'student_dashboard.dart';
-import 'teacher_dashboard.dart';
-import 'admin_dashboard.dart';
-import 'teacher_register_screen.dart';
-
-// -------------------------------------------------------------
-// 1. 로그인 화면 (LoginScreen)
-// -------------------------------------------------------------
-
-class LoginScreen extends StatefulWidget {
-  const LoginScreen({super.key});
-
-  @override
-  State<LoginScreen> createState() => _LoginScreenState();
-}
-
-class _LoginScreenState extends State<LoginScreen> {
-  final TextEditingController _idController = TextEditingController();
-  final TextEditingController _pwController = TextEditingController();
-  bool _isLoading = false;
-
-  Future<void> _login() async {
-    String currentInputId = _idController.text.trim();
-    String currentInputPw = _pwController.text.trim();
-
-    if (currentInputId.isEmpty || currentInputPw.isEmpty) {
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(const SnackBar(content: Text('⚠️ 학번과 비밀번호를 모두 입력해 주세요.')));
-      return;
-    }
-
-    // 🔥 [개발자 마스터 계정]
-    if (currentInputId == "2061") {
-      if (currentInputPw == "happy9642!") {
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(content: Text('👑 개발자 최고 권한으로 로그인되었습니다.')),
-        );
-        Navigator.pushReplacement(
-          context,
-          MaterialPageRoute(
-            builder: (context) => const StudentDashboard(
-              studentId: "2061",
-              studentName: "훗춧가룻",
-              isDeviceMatched: true, // 🆕 [수정] 마스터 계정은 언제나 프리패스이므로 true 변경!
-            ),
-          ),
-        );
-        return;
-      } else {
-        _showErrorDialog('개발자 계정의 마스터 비밀번호가 올바르지 않습니다.');
-        return;
-      }
-    }
-
-    setState(() => _isLoading = true);
-
-    try {
-      String deviceUuid = await getDeviceUuid();
-      String fcmToken = "";
-
-      try {
-        fcmToken = kIsWeb
-            ? await FirebaseMessaging.instance.getToken(
-                    vapidKey: webVapidKey,
-                  ) ??
-                  ""
-            : await FirebaseMessaging.instance.getToken() ?? "";
-        print("발급된 FCM 토큰: $fcmToken");
-      } catch (e) {
-        print("FCM 토큰 가져오기 실패 (파이어베이스 미설정): $e");
-      }
-
-      final response = await http.post(
-        Uri.parse('$baseUrl/login'),
-        headers: {"Content-Type": "application/json"},
-        body: jsonEncode({
-          "studentId": currentInputId,
-          "password": currentInputPw,
-          "deviceUuid": deviceUuid,
-          "fcmToken": fcmToken,
-        }),
-      );
-
-      final resData = jsonDecode(utf8.decode(response.bodyBytes));
-
-      if (response.statusCode == 200) {
-        print("🚨 서버 응답 데이터: $resData");
-
-        String role = '';
-        String name = '';
-        String studentId = '';
-        int isFirstLogin = 0;
-
-        var userObj = resData['user'];
-        if (userObj != null) {
-          role = userObj['role']?.toString() ?? '';
-          name =
-              userObj['name']?.toString() ??
-              userObj['studentName']?.toString() ??
-              userObj['student_name']?.toString() ??
-              '';
-          studentId =
-              userObj['studentId']?.toString() ??
-              userObj['student_id']?.toString() ??
-              currentInputId;
-
-          var rawFirst = userObj['isFirstLogin'] ?? userObj['is_first_login'];
-          isFirstLogin = (rawFirst is bool)
-              ? (rawFirst ? 1 : 0)
-              : (int.tryParse(rawFirst.toString()) ?? 0);
-        } else {
-          role = resData['role']?.toString() ?? '';
-          name =
-              resData['name']?.toString() ??
-              resData['studentName']?.toString() ??
-              '';
-          studentId = resData['studentId']?.toString() ?? currentInputId;
-
-          var rawFirst = resData['isFirstLogin'] ?? resData['is_first_login'];
-          isFirstLogin = (rawFirst is bool)
-              ? (rawFirst ? 1 : 0)
-              : (int.tryParse(rawFirst.toString()) ?? 0);
-        }
-
-        if (name.trim().isEmpty) {
-          name = "알수없음";
-        }
-
-        // 🆕 [추가] 서버 응답 데이터에서 기기 일치 여부 추출하기
-        // (서버가 주는 Key 이름에 맞춰서 데이터를 가져옵니다. 아래 항목 중 맞는 게 알아서 들어감)
-        bool isDeviceMatched =
-            resData['isDeviceMatched'] ??
-            resData['isUuidMatched'] ??
-            resData['is_matched'] ??
-            (userObj != null
-                ? (userObj['isDeviceMatched'] ?? userObj['is_matched'] ?? false)
-                : false);
-
-        if (isFirstLogin == 1) {
-          _showFirstLoginPasswordDialog(
-            studentId,
-            name,
-            role,
-            isDeviceMatched,
-          ); // 🆕 매개변수 추가
-          return;
-        }
-
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('✅ $name님 환영합니다!')));
-        _navigateBasedOnRole(
-          role,
-          studentId,
-          name,
-          isDeviceMatched,
-        ); // 🆕 [수정] 기기 인증 결과 전달
-      } else {
-        String errorMsg = '로그인에 실패했습니다.';
-        if (resData is Map) {
-          errorMsg =
-              resData['detail']?.toString() ??
-              resData['message']?.toString() ??
-              errorMsg;
-        }
-        _showErrorDialog(errorMsg);
-      }
-    } catch (e) {
-      _showErrorDialog('서버와 연결할 수 없습니다. 서버 상태를 확인하세요!\n($e)');
-    } finally {
-      setState(() => _isLoading = false);
-    }
-  }
-
-  // 🛠️ 초기 비밀번호 변경 팝업창 (기기 매칭 데이터 파라미터 추가)
-  void _showFirstLoginPasswordDialog(
-    String studentId,
-    String name,
-    String role,
-    bool isDeviceMatched, // 🆕 추가
-  ) {
-    final TextEditingController newPwController = TextEditingController();
-
-    showDialog(
-      context: context,
-      barrierDismissible: false,
-      builder: (BuildContext dialogContext) {
-        bool isUpdating = false;
-
-        return StatefulBuilder(
-          builder: (context, setDialogState) {
-            return AlertDialog(
-              title: const Text(
-                '🔒 초기 비밀번호 변경',
-                style: TextStyle(fontWeight: FontWeight.bold),
-              ),
-              content: Column(
-                mainAxisSize: MainAxisSize.min,
-                children: [
-                  const Text(
-                    '보안을 위해 새로운 비밀번호를 설정해 주세요.',
-                    style: TextStyle(color: Colors.redAccent),
-                  ),
-                  const SizedBox(height: 16),
-                  TextField(
-                    controller: newPwController,
-                    obscureText: true,
-                    decoration: const InputDecoration(
-                      labelText: '새 비밀번호',
-                      border: OutlineInputBorder(),
-                      prefixIcon: Icon(Icons.lock_reset),
-                    ),
-                  ),
-                ],
-              ),
-              actions: [
-                isUpdating
-                    ? const Padding(
-                        padding: EdgeInsets.only(right: 20.0),
-                        child: CircularProgressIndicator(),
-                      )
-                    : ElevatedButton(
-                        style: ElevatedButton.styleFrom(
-                          backgroundColor: Colors.indigo,
-                          foregroundColor: Colors.white,
-                        ),
-                        onPressed: () async {
-                          String newPassword = newPwController.text.trim();
-                          if (newPassword.isEmpty) {
-                            ScaffoldMessenger.of(context).showSnackBar(
-                              const SnackBar(
-                                content: Text('⚠️ 새 비밀번호를 입력해 주세요.'),
-                              ),
-                            );
-                            return;
-                          }
-
-                          setDialogState(() => isUpdating = true);
-
-                          try {
-                            final response = await http.post(
-                              Uri.parse('$baseUrl/api/users/change-password'),
-                              headers: {"Content-Type": "application/json"},
-                              body: jsonEncode({
-                                "studentId": studentId,
-                                "newPassword": newPassword,
-                              }),
-                            );
-
-                            final resData = jsonDecode(
-                              utf8.decode(response.bodyBytes),
-                            );
-                            setDialogState(() => isUpdating = false);
-
-                            if (response.statusCode == 200 &&
-                                resData['status'] == 'success') {
-                              Navigator.pop(dialogContext);
-                              ScaffoldMessenger.of(context).showSnackBar(
-                                const SnackBar(
-                                  content: Text('✅ 비밀번호가 변경되었습니다!'),
-                                ),
-                              );
-                              _navigateBasedOnRole(
-                                role,
-                                studentId,
-                                name,
-                                isDeviceMatched,
-                              ); // 🆕 수정
-                            } else {
-                              ScaffoldMessenger.of(context).showSnackBar(
-                                SnackBar(
-                                  content: Text('❌ 실패: ${resData['message']}'),
-                                ),
-                              );
-                            }
-                          } catch (e) {
-                            setDialogState(() => isUpdating = false);
-                            ScaffoldMessenger.of(context).showSnackBar(
-                              SnackBar(content: Text('서버 에러 발생: $e')),
-                            );
-                          }
-                        },
-                        child: const Text('변경하고 시작하기'),
-                      ),
-              ],
-            );
-          },
-        );
-      },
-    );
-  }
-
-  // 🆕 [수정] 권한별 화면 이동시 기기 일치 여부 파라미터(`isDeviceMatched`) 수신 및 대시보드 전달
-  void _navigateBasedOnRole(
-    String role,
-    String studentId,
-    String name,
-    bool isDeviceMatched,
-  ) {
-    if (role == 'teacher') {
-      Navigator.pushReplacement(
-        context,
-        MaterialPageRoute(
-          builder: (context) =>
-              TeacherDashboard(teacherId: studentId, teacherName: name),
-        ),
-      );
-    } else if (role == 'admin') {
-      Navigator.pushReplacement(
-        context,
-        MaterialPageRoute(builder: (context) => const AdminDashboard()),
-      );
-    } else {
-      Navigator.pushReplacement(
-        context,
-        MaterialPageRoute(
-          builder: (context) => StudentDashboard(
-            studentId: studentId,
-            studentName: name,
-            isDeviceMatched:
-                isDeviceMatched, // 🆕 [수정] 더이상 false 고정이 아니라 서버 판단 결과 전송!
-          ),
-        ),
-      );
-    }
-  }
-
-  void _showErrorDialog(String message) {
-    showDialog(
-      context: context,
-      builder: (ctx) => AlertDialog(
-        title: const Text(
-          '⚠️ 인증 실패',
-          style: TextStyle(fontWeight: FontWeight.bold),
-        ),
-        content: Text(message),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(ctx),
-            child: const Text('확인'),
-          ),
-        ],
-      ),
-    );
-  }
-
-  void _showLegacyPasswordDialog(
-    String title,
-    String correctPassword,
-    Widget nextPage,
-  ) {
-    final TextEditingController passwordController = TextEditingController();
-    showDialog(
-      context: context,
-      barrierDismissible: false,
-      builder: (BuildContext dialogContext) {
-        return AlertDialog(
-          title: Text('🔒 $title 권한 인증 (기존 방식)'),
-          content: TextField(
-            controller: passwordController,
-            obscureText: true,
-            keyboardType: TextInputType.number,
-            textInputAction: TextInputAction.done,
-            onSubmitted: (value) {
-              if (value == correctPassword) {
-                Navigator.pop(dialogContext);
-                Navigator.push(
-                  context,
-                  MaterialPageRoute(builder: (context) => nextPage),
-                );
-              } else {
-                ScaffoldMessenger.of(context).showSnackBar(
-                  const SnackBar(content: Text('❌ 비밀번호가 올바르지 않습니다.')),
-                );
-              }
-            },
-            decoration: const InputDecoration(
-              hintText: '비밀번호 4자리를 입력하세요',
-              border: OutlineInputBorder(),
-            ),
-          ),
-          actions: [
-            TextButton(
-              onPressed: () => Navigator.pop(dialogContext),
-              child: const Text('취소', style: TextStyle(color: Colors.grey)),
-            ),
-            ElevatedButton(
-              onPressed: () {
-                if (passwordController.text == correctPassword) {
-                  Navigator.pop(dialogContext);
-                  Navigator.push(
-                    context,
-                    MaterialPageRoute(builder: (context) => nextPage),
-                  );
-                } else {
-                  ScaffoldMessenger.of(context).showSnackBar(
-                    const SnackBar(content: Text('❌ 비밀번호가 올바르지 않습니다.')),
-                  );
-                }
-              },
-              child: const Text('인증하기'),
-            ),
-          ],
-        );
-      },
-    );
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      backgroundColor: Colors.grey[50],
-      body: Center(
-        child: SingleChildScrollView(
-          padding: const EdgeInsets.all(24.0),
-          child: ConstrainedBox(
-            constraints: const BoxConstraints(maxWidth: 420),
-            child: Column(
-              mainAxisAlignment: MainAxisAlignment.center,
-              children: [
-                const Icon(Icons.school, size: 80, color: Colors.indigo),
-                const SizedBox(height: 16),
-                const Text(
-                  '백산고등학교 모니터',
-                  style: TextStyle(
-                    fontSize: 26,
-                    fontWeight: FontWeight.bold,
-                    color: Colors.indigo,
-                  ),
-                ),
-                const SizedBox(height: 8),
-                const Text(
-                  '학생 편의 및 학교생활 도우미',
-                  style: TextStyle(color: Colors.grey, fontSize: 15),
-                ),
-                const SizedBox(height: 40),
-                TextField(
-                  controller: _idController,
-                  textInputAction: TextInputAction.next,
-                  decoration: const InputDecoration(
-                    labelText: '학번 또는 교직원 번호',
-                    border: OutlineInputBorder(),
-                    prefixIcon: Icon(Icons.person),
-                  ),
-                ),
-                const SizedBox(height: 16),
-                TextField(
-                  controller: _pwController,
-                  obscureText: true,
-                  textInputAction: TextInputAction.done,
-                  onSubmitted: (_) => _login(),
-                  decoration: const InputDecoration(
-                    labelText: '비밀번호',
-                    border: OutlineInputBorder(),
-                    prefixIcon: Icon(Icons.lock),
-                  ),
-                ),
-                const SizedBox(height: 24),
-                _isLoading
-                    ? const CircularProgressIndicator()
-                    : SizedBox(
-                        width: double.infinity,
-                        height: 55,
-                        child: ElevatedButton(
-                          style: ElevatedButton.styleFrom(
-                            backgroundColor: Colors.indigo,
-                            foregroundColor: Colors.white,
-                            shape: RoundedRectangleBorder(
-                              borderRadius: BorderRadius.circular(12),
-                            ),
-                          ),
-                          onPressed: _login,
-                          child: const Text(
-                            '로그인',
-                            style: TextStyle(
-                              fontSize: 18,
-                              fontWeight: FontWeight.bold,
-                            ),
-                          ),
-                        ),
-                      ),
-                const SizedBox(height: 4),
-                TextButton(
-                  onPressed: () => Navigator.push(
-                    context,
-                    MaterialPageRoute(
-                      builder: (context) => const TeacherRegisterScreen(),
-                    ),
-                  ),
-                  child: const Text(
-                    '👨‍🏫 선생님이신가요? 교사 회원가입 하기',
-                    style: TextStyle(
-                      color: Colors.indigo,
-                      fontWeight: FontWeight.bold,
-                    ),
-                  ),
-                ),
-                const Divider(height: 40),
-                Row(
-                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
-                  children: [
-                    TextButton.icon(
-                      icon: const Icon(
-                        Icons.gavel,
-                        size: 18,
-                        color: Colors.grey,
-                      ),
-                      label: const Text(
-                        '교사 간편인증',
-                        style: TextStyle(color: Colors.grey),
-                      ),
-                      onPressed: () => _showLegacyPasswordDialog(
-                        '선생님',
-                        '1234',
-                        const TeacherDashboard(),
-                      ),
-                    ),
-                    TextButton.icon(
-                      icon: const Icon(
-                        Icons.settings,
-                        size: 18,
-                        color: Colors.grey,
-                      ),
-                      label: const Text(
-                        '관리자 간편인증',
-                        style: TextStyle(color: Colors.grey),
-                      ),
-                      onPressed: () => _showLegacyPasswordDialog(
-                        '시스템 관리자',
-                        '4936',
-                        const AdminDashboard(),
-                      ),
-                    ),
-                  ],
-                ),
-              ],
-            ),
-          ),
-        ),
-      ),
-    );
-  }
-}
diff --git a/lib/screens/nfc_tag_writer_screen.dart b/lib/screens/nfc_tag_writer_screen.dart
deleted file mode 100644
index bc61ecd..0000000
--- a/lib/screens/nfc_tag_writer_screen.dart
+++ /dev/null
@@ -1,204 +0,0 @@
-// 🏷️ (관리자용) 주머니 NFC 스티커 초기 설정 화면. 빈 태그에 "POCKET_번호" 텍스트를 써넣는다.
-import 'dart:convert';
-import 'dart:typed_data';
-import 'package:flutter/material.dart';
-import 'package:http/http.dart' as http;
-import 'package:nfc_manager/nfc_manager.dart';
-import 'package:nfc_manager/nfc_manager_android.dart';
-import 'package:nfc_manager/ndef_record.dart';
-import 'package:nfc_manager_ndef/nfc_manager_ndef.dart';
-import '../config.dart';
-
-class NfcTagWriterScreen extends StatefulWidget {
-  const NfcTagWriterScreen({super.key});
-
-  @override
-  State<NfcTagWriterScreen> createState() => _NfcTagWriterScreenState();
-}
-
-class _NfcTagWriterScreenState extends State<NfcTagWriterScreen> {
-  final TextEditingController _numberController = TextEditingController(
-    text: "1",
-  );
-  bool _isWriting = false;
-  String _statusMessage = "주머니 번호를 입력하고 '쓰기 시작'을 눌러주세요.";
-
-  @override
-  void dispose() {
-    NfcManager.instance.stopSession();
-    _numberController.dispose();
-    super.dispose();
-  }
-
-  void _startWriteSession() async {
-    final String number = _numberController.text.trim();
-    if (number.isEmpty) {
-      _showSnackBar("⚠️ 주머니 번호를 입력해주세요.", Colors.orange);
-      return;
-    }
-    final String pocketLabel = "POCKET_$number";
-
-    bool isAvailable = await NfcManager.instance.isAvailable();
-    if (!isAvailable) {
-      _showSnackBar("❌ NFC가 꺼져있거나 지원되지 않습니다.", Colors.red);
-      return;
-    }
-
-    setState(() {
-      _isWriting = true;
-      _statusMessage = "📡 [$pocketLabel] 쓸 준비 완료! 스티커에 폰 뒷면을 대주세요.";
-    });
-
-    NfcManager.instance.startSession(
-      pollingOptions: {NfcPollingOption.iso14443, NfcPollingOption.iso15693},
-      onDiscovered: (NfcTag tag) async {
-        try {
-          final ndef = Ndef.from(tag);
-          if (ndef == null) {
-            _showSnackBar("❌ 이 태그는 NDEF 쓰기를 지원하지 않는 종류입니다.", Colors.red);
-            return;
-          }
-          if (!ndef.isWritable) {
-            _showSnackBar("❌ 이 태그는 쓰기 잠금(read-only) 상태입니다.", Colors.red);
-            return;
-          }
-
-          await ndef.write(
-            message: NdefMessage(records: [_createTextRecord(pocketLabel)]),
-          );
-
-          // 🔒 태그 복제 방지: 하드웨어 UID를 서버에 등록해서 이 물리 태그만 [pocketLabel]로 인정되게 한다.
-          final String? tagUid = _getTagUid(tag);
-          if (tagUid != null) {
-            await _registerTagUid(tagUid, pocketLabel);
-          }
-
-          if (mounted) {
-            _showSnackBar(
-              tagUid != null
-                  ? "✅ [$pocketLabel] 쓰기 + UID 등록 성공!"
-                  : "⚠️ [$pocketLabel] 쓰기는 성공했지만 UID를 못 읽어 등록은 안 됐습니다.",
-              tagUid != null ? Colors.green : Colors.orange,
-            );
-            // 다음 스티커를 연달아 쓰기 편하도록 번호를 자동으로 1 올려준다.
-            final int? n = int.tryParse(number);
-            setState(() {
-              if (n != null) _numberController.text = (n + 1).toString();
-              _statusMessage = "다음 번호를 확인하고 '쓰기 시작'을 다시 눌러주세요.";
-            });
-          }
-        } catch (e) {
-          _showSnackBar("❌ 쓰기 실패: $e", Colors.red);
-        } finally {
-          await NfcManager.instance.stopSession();
-          if (mounted) setState(() => _isWriting = false);
-        }
-      },
-    );
-  }
-
-  /// 태그의 공장 각인 하드웨어 UID를 16진수 문자열로 반환한다 (쓰기로 바꿀 수 없어 복제 방지 기준으로 씀).
-  String? _getTagUid(NfcTag tag) {
-    final id = NfcTagAndroid.from(tag)?.id;
-    if (id == null || id.isEmpty) return null;
-    return id.map((b) => b.toRadixString(16).padLeft(2, '0')).join().toUpperCase();
-  }
-
-  /// 서버에 "이 UID는 이 주머니 번호다"를 등록한다.
-  Future<void> _registerTagUid(String tagUid, String pocketLabel) async {
-    try {
-      await http.post(
-        Uri.parse("$baseUrl/api/pockets/register"),
-        headers: {"Content-Type": "application/json"},
-        body: jsonEncode({"tagUid": tagUid, "pocketNumber": pocketLabel}),
-      );
-    } catch (e) {
-      _showSnackBar("❌ 서버에 UID 등록 실패: $e", Colors.red);
-    }
-  }
-
-  /// NFC Forum Text Record Type Definition에 맞춰 "언어코드+텍스트" 페이로드를 만든다.
-  NdefRecord _createTextRecord(String text) {
-    const languageCode = 'en';
-    final languageBytes = utf8.encode(languageCode);
-    final textBytes = utf8.encode(text);
-    final payload = Uint8List.fromList([
-      languageBytes.length, // 상태 바이트: UTF-8 + 언어코드 길이
-      ...languageBytes,
-      ...textBytes,
-    ]);
-    return NdefRecord(
-      typeNameFormat: TypeNameFormat.wellKnown,
-      type: Uint8List.fromList([0x54]), // 'T' = Text Record
-      identifier: Uint8List(0),
-      payload: payload,
-    );
-  }
-
-  void _showSnackBar(String text, Color color) {
-    if (!mounted) return;
-    ScaffoldMessenger.of(
-      context,
-    ).showSnackBar(SnackBar(content: Text(text), backgroundColor: color));
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text("🏷️ NFC 주머니 태그 쓰기"),
-        backgroundColor: Colors.deepPurple,
-        foregroundColor: Colors.white,
-      ),
-      body: Padding(
-        padding: const EdgeInsets.all(24.0),
-        child: Column(
-          mainAxisAlignment: MainAxisAlignment.center,
-          children: [
-            TextField(
-              controller: _numberController,
-              keyboardType: TextInputType.number,
-              enabled: !_isWriting,
-              decoration: const InputDecoration(
-                labelText: "주머니 번호",
-                prefixText: "POCKET_",
-                border: OutlineInputBorder(),
-              ),
-            ),
-            const SizedBox(height: 32),
-            Icon(
-              _isWriting ? Icons.nfc : Icons.edit_note_rounded,
-              size: 80,
-              color: _isWriting ? Colors.orange : Colors.deepPurple,
-            ),
-            const SizedBox(height: 16),
-            Text(
-              _statusMessage,
-              textAlign: TextAlign.center,
-              style: const TextStyle(fontSize: 15),
-            ),
-            const SizedBox(height: 32),
-            SizedBox(
-              width: double.infinity,
-              height: 55,
-              child: ElevatedButton(
-                style: ElevatedButton.styleFrom(
-                  backgroundColor: Colors.deepPurple,
-                  foregroundColor: Colors.white,
-                ),
-                onPressed: _isWriting ? null : _startWriteSession,
-                child: Text(
-                  _isWriting ? "태그를 기다리는 중..." : "쓰기 시작",
-                  style: const TextStyle(
-                    fontSize: 16,
-                    fontWeight: FontWeight.bold,
-                  ),
-                ),
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
diff --git a/lib/screens/student_dashboard.dart b/lib/screens/student_dashboard.dart
deleted file mode 100644
index 6e28926..0000000
--- a/lib/screens/student_dashboard.dart
+++ /dev/null
@@ -1,496 +0,0 @@
-// 🎓 학생 대시보드. NFC 주머니 체크인 진입, 실시간 학교 상황 안내,
-// 개발자 마스터 계정 전용 관리 메뉴(현황/DB제어/계정관리/삭제)를 담당한다.
-import 'dart:convert';
-import 'package:flutter/material.dart';
-import 'package:http/http.dart' as http;
-import '../config.dart';
-import '../nfc_poccket_checkin_screen.dart';
-import 'login_screen.dart';
-import 'teacher_attendance_page.dart';
-import 'admin_dashboard.dart';
-import 'student_management_screen.dart';
-import 'nfc_tag_writer_screen.dart';
-
-// -------------------------------------------------------------
-// 2. 학생 대시보드 (StudentDashboard)
-// -------------------------------------------------------------
-
-class StudentDashboard extends StatefulWidget {
-  final String studentId;
-  final String studentName;
-  final bool isDeviceMatched; // 🆕 [변경] 기기 UUID가 매칭되었는지 확인하는 변수 추가
-
-  const StudentDashboard({
-    super.key,
-    required this.studentId,
-    required this.studentName,
-    required this.isDeviceMatched, // 🆕 [변경] 필수 매개변수로 등록
-  });
-
-  @override
-  State<StudentDashboard> createState() => _StudentDashboardState();
-}
-
-class _StudentDashboardState extends State<StudentDashboard> {
-  bool _isLoading = false;
-
-  // 1️⃣ NFC 태그 카드 → 실제 NFC 주머니 체크인 화면으로 이동
-  void _openPocketCheckIn(BuildContext context) {
-    Navigator.push(
-      context,
-      MaterialPageRoute(
-        builder: (context) => NfcPocketCheckInScreen(
-          studentId: widget.studentId,
-          studentName: widget.studentName,
-        ),
-      ),
-    );
-  }
-
-  // 2️⃣ [기존 동일] 마스터 계정 전용 회원 삭제 API 호출 함수
-  Future<void> _deleteUser(BuildContext context, String userId) async {
-    setState(() => _isLoading = true);
-    final url = Uri.parse('$baseUrl/api/users/delete/$userId');
-
-    try {
-      final response = await http.delete(url);
-
-      if (response.statusCode == 200) {
-        final responseData = jsonDecode(response.body);
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('✅ ${responseData['message']}')));
-      } else {
-        final errorData = jsonDecode(response.body);
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(
-            content: Text('❌ 삭제 실패: ${errorData['detail'] ?? '알 수 없는 오류'}'),
-          ),
-        );
-      }
-    } catch (e) {
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('❌ 서버와 연결할 수 없습니다. (네트워크 에러)')),
-      );
-    } finally {
-      setState(() => _isLoading = false);
-    }
-  }
-
-  // 3️⃣ [기존 동일] 학번/교직원 번호를 입력받는 모던 팝업창(Dialog)
-  void _showDeleteUserDialog(BuildContext context) {
-    final TextEditingController idController = TextEditingController();
-
-    showDialog(
-      context: context,
-      builder: (context) {
-        return AlertDialog(
-          shape: RoundedRectangleBorder(
-            borderRadius: BorderRadius.circular(24),
-          ),
-          title: const Row(
-            children: [
-              Icon(Icons.warning_amber_rounded, color: Colors.redAccent),
-              SizedBox(width: 10),
-              Text(
-                '계정 강제 삭제',
-                style: TextStyle(fontWeight: FontWeight.bold, fontSize: 18),
-              ),
-            ],
-          ),
-          content: Column(
-            mainAxisSize: MainAxisSize.min,
-            crossAxisAlignment: CrossAxisAlignment.start,
-            children: [
-              const Text(
-                '학생의 학번 또는 교사의 교직원 번호를 입력하세요.\nDB에서 해당 계정과 토큰이 즉시 삭제됩니다.',
-                style: TextStyle(
-                  color: Colors.black54,
-                  fontSize: 13,
-                  height: 1.4,
-                ),
-              ),
-              const SizedBox(height: 16),
-              TextField(
-                controller: idController,
-                decoration: InputDecoration(
-                  labelText: '학번 또는 교직원 번호',
-                  hintText: '예: 201101 또는 T1001',
-                  labelStyle: TextStyle(color: Colors.red[400]),
-                  focusedBorder: OutlineInputBorder(
-                    borderRadius: BorderRadius.circular(16),
-                    borderSide: BorderSide(color: Colors.red[400]!, width: 2),
-                  ),
-                  border: OutlineInputBorder(
-                    borderRadius: BorderRadius.circular(16),
-                  ),
-                  prefixIcon: const Icon(Icons.person_remove_alt_1_rounded),
-                ),
-              ),
-            ],
-          ),
-          actions: [
-            TextButton(
-              onPressed: () => Navigator.pop(context),
-              child: const Text(
-                '취소',
-                style: TextStyle(
-                  color: Colors.grey,
-                  fontWeight: FontWeight.bold,
-                ),
-              ),
-            ),
-            ElevatedButton(
-              onPressed: () {
-                final inputId = idController.text.trim();
-                if (inputId.isNotEmpty) {
-                  Navigator.pop(context);
-                  _deleteUser(context, inputId);
-                }
-              },
-              style: ElevatedButton.styleFrom(
-                backgroundColor: Colors.redAccent,
-                foregroundColor: Colors.white,
-                shape: RoundedRectangleBorder(
-                  borderRadius: BorderRadius.circular(12),
-                ),
-                elevation: 0,
-              ),
-              child: const Text(
-                '삭제 실행',
-                style: TextStyle(fontWeight: FontWeight.bold),
-              ),
-            ),
-          ],
-        );
-      },
-    );
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    final bool isDeveloper = widget.studentId == "2061";
-
-    return Scaffold(
-      backgroundColor: Colors.grey[100],
-      appBar: AppBar(
-        title: Text(
-          isDeveloper ? '👑 MASTER CONTROL' : '🎓 STUDENT PORTAL',
-          style: const TextStyle(
-            fontWeight: FontWeight.bold,
-            letterSpacing: 1.2,
-          ),
-        ),
-        centerTitle: true,
-        backgroundColor: isDeveloper
-            ? Colors.deepPurple[700]
-            : Colors.indigo[700],
-        foregroundColor: Colors.white,
-        elevation: 0,
-        actions: [
-          IconButton(
-            icon: const Icon(Icons.logout_rounded),
-            onPressed: () => Navigator.pushReplacement(
-              context,
-              MaterialPageRoute(builder: (context) => const LoginScreen()),
-            ),
-          ),
-        ],
-      ),
-      body: SingleChildScrollView(
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Container(
-              width: double.infinity,
-              padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 28),
-              decoration: BoxDecoration(
-                color: isDeveloper
-                    ? Colors.deepPurple[700]
-                    : Colors.indigo[700],
-                borderRadius: const BorderRadius.only(
-                  bottomLeft: Radius.circular(32),
-                  bottomRight: Radius.circular(32),
-                ),
-              ),
-              child: Row(
-                children: [
-                  Container(
-                    padding: const EdgeInsets.all(4),
-                    decoration: const BoxDecoration(
-                      color: Colors.white,
-                      shape: BoxShape.circle,
-                    ),
-                    child: CircleAvatar(
-                      radius: 30,
-                      backgroundColor: isDeveloper
-                          ? Colors.deepPurple[50]
-                          : Colors.indigo[50],
-                      child: Icon(
-                        isDeveloper
-                            ? Icons.admin_panel_settings_rounded
-                            : Icons.school_rounded,
-                        size: 32,
-                        color: isDeveloper ? Colors.deepPurple : Colors.indigo,
-                      ),
-                    ),
-                  ),
-                  const SizedBox(width: 18),
-                  Column(
-                    crossAxisAlignment: CrossAxisAlignment.start,
-                    children: [
-                      Text(
-                        '${widget.studentName} 님',
-                        style: const TextStyle(
-                          fontSize: 22,
-                          fontWeight: FontWeight.bold,
-                          color: Colors.white,
-                        ),
-                      ),
-                      const SizedBox(height: 4),
-                      Text(
-                        isDeveloper
-                            ? '최고 관리 권한 활성화됨'
-                            : '학번: ${widget.studentId} | 인증 완료',
-                        style: TextStyle(
-                          color: Colors.white.withValues(alpha: 0.8),
-                          fontSize: 14,
-                        ),
-                      ),
-                    ],
-                  ),
-                ],
-              ),
-            ),
-            const SizedBox(height: 32),
-            Padding(
-              padding: const EdgeInsets.symmetric(horizontal: 24.0),
-              child: Row(
-                children: [
-                  Container(
-                    width: 4,
-                    height: 18,
-                    decoration: BoxDecoration(
-                      color: isDeveloper ? Colors.deepPurple : Colors.indigo,
-                      borderRadius: BorderRadius.circular(2),
-                    ),
-                  ),
-                  const SizedBox(width: 10),
-                  const Text(
-                    '스마트 관리 시스템 메뉴',
-                    style: TextStyle(
-                      fontSize: 18,
-                      fontWeight: FontWeight.bold,
-                      color: Colors.black87,
-                    ),
-                  ),
-                ],
-              ),
-            ),
-            const SizedBox(height: 16),
-            Padding(
-              padding: const EdgeInsets.symmetric(horizontal: 24.0),
-              child: GridView.count(
-                shrinkWrap: true,
-                physics: const NeverScrollableScrollPhysics(),
-                crossAxisCount: 2,
-                crossAxisSpacing: 16,
-                mainAxisSpacing: 16,
-                childAspectRatio: 0.95,
-                children: [
-                  // 🆕 [변경 지점] 기기가 일치하면 정상 활성화, 일치하지 않으면 자물쇠Lock 처리
-                  if (isDeveloper || widget.studentId != "2061")
-                    _buildModernCard(
-                      icon: widget.isDeviceMatched
-                          ? Icons.contactless_rounded
-                          : Icons.lock_rounded,
-                      title: 'NFC 태그',
-                      subtitle: widget.isDeviceMatched
-                          ? '출석 및 폰 수거 완료'
-                          : '⚠️ 본인 인증 기기 전용',
-                      color: widget.isDeviceMatched
-                          ? Colors.blue
-                          : Colors.grey[400]!,
-                      onTap: widget.isDeviceMatched
-                          ? () => _openPocketCheckIn(context)
-                          : () {
-                              ScaffoldMessenger.of(context).showSnackBar(
-                                const SnackBar(
-                                  content: Text(
-                                    '🚨 대리 출석 방지를 위해 등록된 본인 스마트폰에서만 출석 가능합니다.',
-                                  ),
-                                ),
-                              );
-                            },
-                      isActionButton: widget.isDeviceMatched,
-                      isLoading: _isLoading,
-                    ),
-
-                  // 🆕 [추가 지점] 기기 일치 여부 상관없이 태블릿에서도 누구나 확인 가능한 학교 상황판 카드
-                  _buildModernCard(
-                    icon: Icons.fastfood_rounded,
-                    title: '실시간 학교 상황',
-                    subtitle: '급식실 줄 & 매점 재고 확인',
-                    color: Colors.orange[700]!,
-                    onTap: () {
-                      ScaffoldMessenger.of(context).showSnackBar(
-                        const SnackBar(
-                          content: Text('🍔 실시간 학교 상황 페이지로 이동합니다.'),
-                        ),
-                      );
-                    },
-                  ),
-
-                  if (isDeveloper)
-                    _buildModernCard(
-                      icon: Icons.monitor_heart_rounded,
-                      title: '실시간 현황',
-                      subtitle: '교사용 수거 모니터링',
-                      color: Colors.teal,
-                      onTap: () => Navigator.push(
-                        context,
-                        MaterialPageRoute(
-                          builder: (context) => const TeacherAttendancePage(),
-                        ),
-                      ),
-                    ),
-                  if (isDeveloper)
-                    _buildModernCard(
-                      icon: Icons.terminal_rounded,
-                      title: '서버 DB 제어',
-                      subtitle: '시스템 원격 초기화',
-                      color: Colors.amber[800]!,
-                      onTap: () => Navigator.push(
-                        context,
-                        MaterialPageRoute(
-                          builder: (context) => const AdminDashboard(),
-                        ),
-                      ),
-                    ),
-                  if (isDeveloper)
-                    _buildModernCard(
-                      icon: Icons.add_moderator_rounded,
-                      title: '학생 계정 관리',
-                      subtitle: 'UUID 리셋 및 승인',
-                      color: Colors.purple,
-                      onTap: () => Navigator.push(
-                        context,
-                        MaterialPageRoute(
-                          builder: (context) => const StudentManagementScreen(),
-                        ),
-                      ),
-                    ),
-                  if (isDeveloper)
-                    _buildModernCard(
-                      icon: Icons.delete_sweep_rounded,
-                      title: '계정 강제 삭제',
-                      subtitle: '학생 및 교사 DB 삭제',
-                      color: Colors.red[600]!,
-                      onTap: () => _showDeleteUserDialog(context),
-                    ),
-                  if (isDeveloper)
-                    _buildModernCard(
-                      icon: Icons.edit_note_rounded,
-                      title: 'NFC 태그 쓰기',
-                      subtitle: '주머니 스티커 초기 설정',
-                      color: Colors.deepPurple,
-                      onTap: () => Navigator.push(
-                        context,
-                        MaterialPageRoute(
-                          builder: (context) => const NfcTagWriterScreen(),
-                        ),
-                      ),
-                    ),
-                ],
-              ),
-            ),
-            const SizedBox(height: 32),
-          ],
-        ),
-      ),
-    );
-  }
-
-  // 5️⃣ [카드 디자인 위젯] - 기존 형태 완전 보존
-  Widget _buildModernCard({
-    required IconData icon,
-    required String title,
-    required String subtitle,
-    required Color color,
-    required VoidCallback onTap,
-    bool isActionButton = false,
-    bool isLoading = false,
-  }) {
-    return InkWell(
-      onTap: isLoading ? null : onTap,
-      borderRadius: BorderRadius.circular(24),
-      child: Ink(
-        padding: const EdgeInsets.all(20),
-        decoration: BoxDecoration(
-          color: Colors.white,
-          borderRadius: BorderRadius.circular(24),
-          boxShadow: [
-            BoxShadow(
-              color: Colors.black.withValues(alpha: 0.04),
-              blurRadius: 16,
-              offset: const Offset(0, 4),
-            ),
-          ],
-        ),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          mainAxisAlignment: MainAxisAlignment.spaceBetween,
-          children: [
-            Container(
-              padding: const EdgeInsets.all(12),
-              decoration: BoxDecoration(
-                color: color.withValues(alpha: 0.1),
-                borderRadius: BorderRadius.circular(16),
-              ),
-              child: Icon(icon, color: color, size: 28),
-            ),
-            Column(
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: [
-                Row(
-                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
-                  children: [
-                    Text(
-                      title,
-                      style: const TextStyle(
-                        fontSize: 16,
-                        fontWeight: FontWeight.bold,
-                        color: Colors.black87,
-                      ),
-                    ),
-                    if (isLoading)
-                      const SizedBox(
-                        width: 16,
-                        height: 16,
-                        child: CircularProgressIndicator(strokeWidth: 2),
-                      )
-                    else if (isActionButton)
-                      Icon(
-                        Icons.touch_app_rounded,
-                        size: 16,
-                        color: color.withValues(alpha: 0.5),
-                      ),
-                  ],
-                ),
-                const SizedBox(height: 4),
-                Text(
-                  subtitle,
-                  style: TextStyle(
-                    fontSize: 12,
-                    color: Colors.grey[500],
-                    height: 1.2,
-                  ),
-                ),
-              ],
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
diff --git a/lib/screens/student_management_screen.dart b/lib/screens/student_management_screen.dart
deleted file mode 100644
index a2a6706..0000000
--- a/lib/screens/student_management_screen.dart
+++ /dev/null
@@ -1,338 +0,0 @@
-// 🔐 (마스터 계정용) 학생 계정 및 기기 관리 화면. 기기 UUID 초기화와 계정 삭제를 담당한다.
-import 'dart:convert';
-import 'package:flutter/material.dart';
-import 'package:http/http.dart' as http;
-import '../config.dart';
-
-// ==========================================
-// 🔐 6. 학생 계정 및 기기 관리 화면 (기기 리셋 + 계정 삭제 완본)
-// ==========================================
-class StudentManagementScreen extends StatefulWidget {
-  const StudentManagementScreen({super.key});
-
-  @override
-  State<StudentManagementScreen> createState() =>
-      _StudentManagementScreenState();
-}
-
-class _StudentManagementScreenState extends State<StudentManagementScreen> {
-  List<dynamic> realStudents = [];
-  bool _isLoading = true;
-
-  @override
-  void initState() {
-    super.initState();
-    _fetchStudents();
-  }
-
-  // 🌐 서버에서 전체 학생 목록 불러오기
-  Future<void> _fetchStudents() async {
-    setState(() => _isLoading = true);
-    try {
-      final response = await http.get(Uri.parse('$baseUrl/api/users'));
-      if (response.statusCode == 200) {
-        final data = jsonDecode(utf8.decode(response.bodyBytes));
-        setState(() {
-          realStudents = data['users'] ?? [];
-          _isLoading = false;
-        });
-      }
-    } catch (e) {
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(SnackBar(content: Text('데이터 불러오기 실패: $e')));
-      setState(() => _isLoading = false);
-    }
-  }
-
-  // 🌐 서버로 기기 초기화(리셋) 명령 보내기
-  Future<void> _resetDevice(String studentId, String studentName) async {
-    showDialog(
-      context: context,
-      builder: (ctx) => AlertDialog(
-        title: const Text(
-          '⚠️ 기기 잠금 해제',
-          style: TextStyle(fontWeight: FontWeight.bold, color: Colors.purple),
-        ),
-        content: Text('$studentName 학생의 스마트폰 기기 등록을 초기화하시겠습니까?'),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(ctx),
-            child: const Text('취소', style: TextStyle(color: Colors.grey)),
-          ),
-          ElevatedButton(
-            style: ElevatedButton.styleFrom(
-              backgroundColor: Colors.purple,
-              foregroundColor: Colors.white,
-            ),
-            onPressed: () async {
-              Navigator.pop(ctx);
-              try {
-                final response = await http.post(
-                  Uri.parse('$baseUrl/api/users/reset'),
-                  headers: {"Content-Type": "application/json"},
-                  body: jsonEncode({"studentId": studentId}),
-                );
-                if (response.statusCode == 200) {
-                  ScaffoldMessenger.of(context).showSnackBar(
-                    SnackBar(content: Text('✅ $studentName 학생 기기 초기화 완료!')),
-                  );
-                  _fetchStudents();
-                }
-              } catch (e) {
-                ScaffoldMessenger.of(
-                  context,
-                ).showSnackBar(const SnackBar(content: Text('❌ 초기화 통신 실패')));
-              }
-            },
-            child: const Text('초기화 승인'),
-          ),
-        ],
-      ),
-    );
-  }
-
-  // 🌐 [새 기능] 서버로 계정 완전 삭제 명령 보내기 함수
-  Future<void> _deleteUser(String studentId, String studentName) async {
-    showDialog(
-      context: context,
-      builder: (ctx) => AlertDialog(
-        title: const Text(
-          '🚨 계정 완전 삭제 경고',
-          style: TextStyle(fontWeight: FontWeight.bold, color: Colors.red),
-        ),
-        content: Text(
-          '정말로 $studentName ($studentId) 학생의 계정을 시스템에서 탈퇴(삭제)시키겠습니까?\n\n이 작업은 되돌릴 수 없으며, 해당 학생은 다시 회원가입을 진행해야 합니다.',
-        ),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(ctx),
-            child: const Text('취소', style: TextStyle(color: Colors.grey)),
-          ),
-          ElevatedButton(
-            style: ElevatedButton.styleFrom(
-              backgroundColor: Colors.red,
-              foregroundColor: Colors.white,
-            ),
-            onPressed: () async {
-              Navigator.pop(ctx);
-              try {
-                // 💡 http.delete 함수를 사용하여 서버에 계정 삭제 요청 발송!
-                final response = await http.delete(
-                  Uri.parse('$baseUrl/api/users/delete'),
-                  headers: {"Content-Type": "application/json"},
-                  body: jsonEncode({"studentId": studentId}),
-                );
-
-                if (response.statusCode == 200) {
-                  ScaffoldMessenger.of(context).showSnackBar(
-                    SnackBar(
-                      content: Text('💥 $studentName 학생의 계정이 영구 삭제되었습니다.'),
-                    ),
-                  );
-                  _fetchStudents(); // 성공하면 목록 새로고침!
-                }
-              } catch (e) {
-                ScaffoldMessenger.of(
-                  context,
-                ).showSnackBar(const SnackBar(content: Text('❌ 계정 삭제 통신 실패')));
-              }
-            },
-            child: const Text('영구 삭제'),
-          ),
-        ],
-      ),
-    );
-  }
-
-  // 💡 _StudentManagementScreenState 클래스 내부에 붙여넣으세요.
-  void _showCreateUserDialog() {
-    final idController = TextEditingController();
-    final nameController = TextEditingController();
-
-    showDialog(
-      context: context,
-      builder: (context) => AlertDialog(
-        title: const Text('👤 신규 학생 계정 추가'),
-        content: Column(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            TextField(
-              controller: idController,
-              decoration: const InputDecoration(labelText: '학번 입력 (예: 20101)'),
-              keyboardType: TextInputType.number,
-            ),
-            const SizedBox(height: 8),
-            TextField(
-              controller: nameController,
-              decoration: const InputDecoration(labelText: '학생 이름 입력'),
-            ),
-          ],
-        ),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(context),
-            child: const Text('취소'),
-          ),
-          ElevatedButton(
-            onPressed: () async {
-              String studentId = idController.text.trim();
-              String name = nameController.text.trim();
-
-              if (studentId.isEmpty || name.isEmpty) {
-                ScaffoldMessenger.of(context).showSnackBar(
-                  const SnackBar(content: Text('⚠️ 학번과 이름을 모두 입력하세요.')),
-                );
-                return;
-              }
-
-              try {
-                // ⚠️ 여기도 훗춧가룻님의 프로젝트 전역 baseUrl 변수명으로 맞춰주세요!
-                final response = await http.post(
-                  Uri.parse('$baseUrl/api/users/create'),
-                  headers: {"Content-Type": "application/json"},
-                  body: jsonEncode({"studentId": studentId, "name": name}),
-                );
-
-                final res = jsonDecode(response.body);
-                if (res['status'] == 'success') {
-                  Navigator.pop(context); // 팝업 닫기
-                  ScaffoldMessenger.of(context).showSnackBar(
-                    SnackBar(content: Text('✅ ${res['message']}')),
-                  );
-                  _fetchStudents(); // 🔄 추가 완료 후 목록 새로고침 (기존 함수명 확인 필요)
-                } else {
-                  ScaffoldMessenger.of(context).showSnackBar(
-                    SnackBar(content: Text('❌ ${res['message']}')),
-                  );
-                }
-              } catch (e) {
-                ScaffoldMessenger.of(context).showSnackBar(
-                  const SnackBar(content: Text('❌ 학생 등록 실패 (통신 에러)')),
-                );
-              }
-            },
-            child: const Text('생성'),
-          ),
-        ],
-      ),
-    );
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      backgroundColor: Colors.grey[50],
-      appBar: AppBar(
-        title: const Text(
-          '학생 계정 및 기기 관리',
-          style: TextStyle(fontWeight: FontWeight.bold),
-        ),
-        backgroundColor: Colors.purple,
-        foregroundColor: Colors.white,
-        actions: [
-          IconButton(
-            icon: const Icon(Icons.person_add_alt_1_rounded),
-            onPressed: () => _showCreateUserDialog(), // 팝업 띄우는 함수 제작하여 연결
-          ),
-          IconButton(
-            icon: const Icon(Icons.refresh),
-            onPressed: _fetchStudents,
-          ),
-        ],
-      ),
-      body: _isLoading
-          ? const Center(child: CircularProgressIndicator(color: Colors.purple))
-          : realStudents.isEmpty
-          ? const Center(
-              child: Text(
-                '가입된 학생 계정이 없습니다.',
-                style: TextStyle(color: Colors.grey, fontSize: 16),
-              ),
-            )
-          : ListView.builder(
-              padding: const EdgeInsets.all(16),
-              itemCount: realStudents.length,
-              itemBuilder: (context, index) {
-                final student = realStudents[index];
-                final bool needsReset = student['device'] == "초기화 필요";
-
-                return Card(
-                  elevation: 2,
-                  margin: const EdgeInsets.only(bottom: 12),
-                  shape: RoundedRectangleBorder(
-                    borderRadius: BorderRadius.circular(16),
-                  ),
-                  child: ListTile(
-                    contentPadding: const EdgeInsets.symmetric(
-                      horizontal: 16,
-                      vertical: 12,
-                    ),
-                    leading: CircleAvatar(
-                      backgroundColor: needsReset
-                          ? Colors.red[50]
-                          : Colors.purple[50],
-                      child: Icon(
-                        needsReset ? Icons.lock_reset : Icons.person,
-                        color: needsReset ? Colors.red : Colors.purple,
-                      ),
-                    ),
-                    title: Text(
-                      '${student['name']} (${student['id']})',
-                      style: const TextStyle(
-                        fontWeight: FontWeight.bold,
-                        fontSize: 16,
-                      ),
-                    ),
-                    subtitle: Text(
-                      needsReset ? '기기 초기화 승인 대기중' : '정상 등록 상태',
-                      style: TextStyle(
-                        color: needsReset ? Colors.red : Colors.grey,
-                        fontWeight: needsReset
-                            ? FontWeight.bold
-                            : FontWeight.normal,
-                      ),
-                    ),
-                    // 🕹️ 오른쪽 끝에 [기기 리셋] 버튼과 [쓰레기통(삭제)] 버튼을 나란히 배치하는 Row 레이아웃 기획
-                    trailing: Row(
-                      mainAxisSize: MainAxisSize.min, // 콤팩트하게 뭉치기
-                      children: [
-                        if (!needsReset)
-                          OutlinedButton(
-                            style: OutlinedButton.styleFrom(
-                              foregroundColor: Colors.purple,
-                              side: BorderSide(
-                                color: Colors.purple.withValues(alpha: 0.5),
-                              ),
-                              shape: RoundedRectangleBorder(
-                                borderRadius: BorderRadius.circular(8),
-                              ),
-                            ),
-                            onPressed: () =>
-                                _resetDevice(student['id'], student['name']),
-                            child: const Text('기기 리셋'),
-                          )
-                        else
-                          const Icon(Icons.check_circle, color: Colors.green),
-
-                        const SizedBox(width: 8),
-
-                        // 🔴 [새 버튼] 최고권한 마스터 전용 계정 영구 삭제 쓰레기통 버튼!
-                        IconButton(
-                          icon: const Icon(
-                            Icons.delete_forever_rounded,
-                            color: Colors.redAccent,
-                          ),
-                          tooltip: '계정 영구 삭제',
-                          onPressed: () =>
-                              _deleteUser(student['id'], student['name']),
-                        ),
-                      ],
-                    ),
-                  ),
-                );
-              },
-            ),
-    );
-  }
-}
diff --git a/lib/screens/teacher_register_screen.dart b/lib/screens/teacher_register_screen.dart
deleted file mode 100644
index d199398..0000000
--- a/lib/screens/teacher_register_screen.dart
+++ /dev/null
@@ -1,152 +0,0 @@
-// 👨‍🏫 교사 회원가입 화면. 교사 인증 코드 확인 후 신규 교사 계정을 생성한다.
-import 'dart:convert';
-import 'package:flutter/material.dart';
-import 'package:http/http.dart' as http;
-import '../config.dart';
-
-class TeacherRegisterScreen extends StatefulWidget {
-  const TeacherRegisterScreen({super.key});
-
-  @override
-  State<TeacherRegisterScreen> createState() => _TeacherRegisterScreenState();
-}
-
-class _TeacherRegisterScreenState extends State<TeacherRegisterScreen> {
-  final _idController = TextEditingController();
-  final _pwController = TextEditingController();
-  final _nameController = TextEditingController();
-  final _secretController = TextEditingController();
-  bool _isLoading = false;
-
-  Future<void> _registerTeacher() async {
-    String id = _idController.text.trim();
-    String pw = _pwController.text.trim();
-    String name = _nameController.text.trim();
-    String secret = _secretController.text.trim();
-
-    // 💡 테스트용 고유값 (실제 디바이스 UUID 연동 로직이 있다면 그걸 넣으세요)
-    String dummyUuid = "TEACHER_PHONE_$id";
-
-    if (id.isEmpty || pw.isEmpty || name.isEmpty || secret.isEmpty) {
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(const SnackBar(content: Text('⚠️ 모든 빈칸을 입력해 주세요.')));
-      return;
-    }
-
-    setState(() => _isLoading = true);
-    try {
-      final response = await http.post(
-        Uri.parse('$baseUrl/api/users/register-teacher'),
-        headers: {"Content-Type": "application/json"},
-        body: jsonEncode({
-          "teacherId": id,
-          "password": pw,
-          "name": name,
-          "secretCode": secret,
-          "deviceUuid": dummyUuid,
-        }),
-      );
-
-      final res = jsonDecode(response.body);
-
-      if (response.statusCode == 200 && res['status'] == 'success') {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('✅ ${res['message']}')));
-        Navigator.pop(context); // 가입 성공 시 로그인 화면으로 복귀
-      } else {
-        // 백엔드에서 보낸 에러 메시지(detail 혹은 message) 출력
-        String errorMsg = res['detail'] ?? res['message'] ?? '회원가입에 실패했습니다.';
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('❌ $errorMsg')));
-      }
-    } catch (e) {
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(const SnackBar(content: Text('❌ 서버와 통신에 실패했습니다.')));
-    } finally {
-      setState(() => _isLoading = false);
-    }
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('교사 회원가입'),
-        backgroundColor: Colors.indigo,
-        foregroundColor: Colors.white,
-      ),
-      body: SingleChildScrollView(
-        padding: const EdgeInsets.all(24.0),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            const Text(
-              '👨‍🏫 교직원 전용 인증',
-              style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
-            ),
-            const SizedBox(height: 4),
-            const Text(
-              '학교에서 발급한 교사 가입 비밀코드가 필요합니다.',
-              style: TextStyle(color: Colors.grey),
-            ),
-            const SizedBox(height: 24),
-            TextField(
-              controller: _secretController,
-              obscureText: true,
-              decoration: const InputDecoration(
-                labelText: '🔑 교사 인증 비밀코드 입력',
-                border: OutlineInputBorder(),
-              ),
-            ),
-            const SizedBox(height: 16),
-            const Divider(),
-            const SizedBox(height: 16),
-            TextField(
-              controller: _idController,
-              decoration: const InputDecoration(
-                labelText: '교직원 번호 (ID로 사용)',
-                border: OutlineInputBorder(),
-              ),
-            ),
-            const SizedBox(height: 12),
-            TextField(
-              controller: _nameController,
-              decoration: const InputDecoration(
-                labelText: '선생님 성함',
-                border: OutlineInputBorder(),
-              ),
-            ),
-            const SizedBox(height: 12),
-            TextField(
-              controller: _pwController,
-              obscureText: true,
-              decoration: const InputDecoration(
-                labelText: '사용할 비밀번호 입력',
-                border: OutlineInputBorder(),
-              ),
-            ),
-            const SizedBox(height: 24),
-            SizedBox(
-              width: double.infinity,
-              height: 50,
-              child: ElevatedButton(
-                style: ElevatedButton.styleFrom(
-                  backgroundColor: Colors.indigo,
-                  foregroundColor: Colors.white,
-                ),
-                onPressed: _isLoading ? null : _registerTeacher,
-                child: _isLoading
-                    ? const CircularProgressIndicator(color: Colors.white)
-                    : const Text('교사 계정 생성하기'),
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
diff --git a/lib/screens/teacher_student_management_page.dart b/lib/screens/teacher_student_management_page.dart
deleted file mode 100644
index cd519cb..0000000
--- a/lib/screens/teacher_student_management_page.dart
+++ /dev/null
@@ -1,363 +0,0 @@
-// 👥 교사용 학생 계정 관리 화면. 신규 학생 계정 추가와 계정 강제 삭제를 담당한다.
-import 'dart:convert';
-import 'package:flutter/material.dart';
-import 'package:http/http.dart' as http;
-import '../config.dart';
-
-// -----------------------------------------------------------------------------
-// 👥 [서브 화면 2] 학생 계정 관리 란 (추가 양식 폼 + 강제 삭제 다이얼로그 완전 내장)
-// -----------------------------------------------------------------------------
-class TeacherStudentManagementPage extends StatefulWidget {
-  const TeacherStudentManagementPage({super.key});
-
-  @override
-  State<TeacherStudentManagementPage> createState() =>
-      _TeacherStudentManagementPageState();
-}
-
-class _TeacherStudentManagementPageState
-    extends State<TeacherStudentManagementPage> {
-  final TextEditingController _addIdController = TextEditingController();
-  final TextEditingController _addNameController = TextEditingController();
-  final TextEditingController _addPwController = TextEditingController();
-  bool _isWorking = false;
-
-  // ➕ [학생 추가 API 연동용 함수]
-  
-  Future<void> _addStudentAccount() async {
-    final sId = _addIdController.text.trim();
-    final sName = _addNameController.text.trim();
-    final sPw = _addPwController.text.trim();
-
-    if (sId.isEmpty || sName.isEmpty || sPw.isEmpty) {
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(const SnackBar(content: Text('⚠️ 모든 입력란을 채워주세요.')));
-      return;
-    }
-
-    setState(() => _isWorking = true);
-    try {
-      final url = Uri.parse('$baseUrl/api/users/register-student');
-      final response = await http.post(
-        url,
-        headers: {"Content-Type": "application/json"},
-        body: jsonEncode({"studentId": sId, "name": sName, "password": sPw}),
-      );
-      final result = jsonDecode(utf8.decode(response.bodyBytes));
-
-      if (response.statusCode == 200 || response.statusCode == 201) {
-        _addIdController.clear();
-        _addNameController.clear();
-        _addPwController.clear();
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('✅ 계정 생성 완료: ${result['message'] ?? '성공'}')),
-        );
-      } else {
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('❌ 생성 실패: ${result['message'] ?? '오류 발생'}')),
-        );
-      }
-    } catch (e) {
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(SnackBar(content: Text('🚨 네트워크 에러: $e')));
-    } finally {
-      setState(() => _isWorking = false);
-    }
-  }
-  
-  // ❌ [학생 삭제 API 연동용 함수]
-  Future<void> _deleteStudentAccount(String studentId) async {
-    setState(() => _isWorking = true);
-    final url = Uri.parse('$baseUrl/api/users/delete/$studentId');
-
-    try {
-      final response = await http.delete(url);
-      if (response.statusCode == 200) {
-        final resData = jsonDecode(utf8.decode(response.bodyBytes));
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('✅ ${resData['message']}')));
-      } else {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(const SnackBar(content: Text('❌ 삭제 실패하였습니다.')));
-      }
-    } catch (e) {
-      ScaffoldMessenger.of(
-        context,
-      ).showSnackBar(const SnackBar(content: Text('❌ 서버 에러 발생')));
-    } finally {
-      setState(() => _isWorking = false);
-    }
-  }
-
-  // 🚨 계정 삭제 확인 팝업창 모달
-  void _showDeleteDialog() {
-    final TextEditingController deleteIdController = TextEditingController();
-    showDialog(
-      context: context,
-      builder: (context) {
-        return AlertDialog(
-          shape: RoundedRectangleBorder(
-            borderRadius: BorderRadius.circular(24),
-          ),
-          title: Row(
-            children: [
-              Icon(Icons.warning_amber_rounded, color: Colors.orange[700]),
-              const SizedBox(width: 10),
-              const Text(
-                '학생 계정 강제 삭제',
-                style: TextStyle(fontWeight: FontWeight.bold, fontSize: 18),
-              ),
-            ],
-          ),
-          content: Column(
-            mainAxisSize: MainAxisSize.min,
-            children: [
-              const Text(
-                '영구 삭제할 학생의 학번을 정확하게 입력하세요.',
-                style: TextStyle(color: Colors.black54, fontSize: 13),
-              ),
-              const SizedBox(height: 16),
-              TextField(
-                controller: deleteIdController,
-                keyboardType: TextInputType.number,
-                decoration: InputDecoration(
-                  labelText: '학번 입력',
-                  labelStyle: TextStyle(color: Colors.orange[700]),
-                  focusedBorder: OutlineInputBorder(
-                    borderRadius: BorderRadius.circular(16),
-                    borderSide: BorderSide(
-                      color: Colors.orange[700]!,
-                      width: 2,
-                    ),
-                  ),
-                  border: OutlineInputBorder(
-                    borderRadius: BorderRadius.circular(16),
-                  ),
-                  prefixIcon: const Icon(Icons.no_accounts_rounded),
-                ),
-              ),
-            ],
-          ),
-          actions: [
-            TextButton(
-              onPressed: () => Navigator.pop(context),
-              child: const Text('취소', style: TextStyle(color: Colors.grey)),
-            ),
-            ElevatedButton(
-              onPressed: () {
-                final inputId = deleteIdController.text.trim();
-                if (inputId.isNotEmpty) {
-                  Navigator.pop(context);
-                  _deleteStudentAccount(inputId);
-                }
-              },
-              style: ElevatedButton.styleFrom(
-                backgroundColor: Colors.orange[700],
-                foregroundColor: Colors.white,
-                shape: RoundedRectangleBorder(
-                  borderRadius: BorderRadius.circular(12),
-                ),
-              ),
-              child: const Text(
-                '삭제 확정',
-                style: TextStyle(fontWeight: FontWeight.bold),
-              ),
-            ),
-          ],
-        );
-      },
-    );
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      backgroundColor: Colors.grey[100],
-      appBar: AppBar(
-        title: const Text(
-          '⚙️ 학생 통합 관리 센터',
-          style: TextStyle(fontWeight: FontWeight.bold),
-        ),
-        backgroundColor: Colors.orange,
-        foregroundColor: Colors.white,
-        elevation: 0,
-      ),
-      body: SingleChildScrollView(
-        padding: const EdgeInsets.all(24.0),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            // 🏷️ 인디케이터 바 1 (추가 메뉴)
-            Row(
-              children: [
-                Container(
-                  width: 4,
-                  height: 16,
-                  decoration: BoxDecoration(
-                    color: Colors.orange,
-                    borderRadius: BorderRadius.circular(2),
-                  ),
-                ),
-                const SizedBox(width: 8),
-                const Text(
-                  '신규 학생 계정 추가',
-                  style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
-                ),
-              ],
-            ),
-            const SizedBox(height: 16),
-
-            // 📝 학생 추가 컨테이너 폼
-            Container(
-              padding: const EdgeInsets.all(20),
-              decoration: BoxDecoration(
-                color: Colors.white,
-                borderRadius: BorderRadius.circular(24),
-                boxShadow: [
-                  BoxShadow(
-                    color: Colors.black.withValues(alpha: 0.04),
-                    blurRadius: 16,
-                  ),
-                ],
-              ),
-              child: Column(
-                children: [
-                  TextField(
-                    controller: _addIdController,
-                    keyboardType: TextInputType.number,
-                    decoration: const InputDecoration(
-                      labelText: '학번',
-                      prefixIcon: Icon(Icons.badge),
-                    ),
-                  ),
-                  const SizedBox(height: 12),
-                  TextField(
-                    controller: _addNameController,
-                    decoration: const InputDecoration(
-                      labelText: '이름',
-                      prefixIcon: Icon(Icons.person),
-                    ),
-                  ),
-                  const SizedBox(height: 12),
-                  TextField(
-                    controller: _addPwController,
-                    obscureText: true,
-                    decoration: const InputDecoration(
-                      labelText: '초기 비밀번호',
-                      prefixIcon: Icon(Icons.lock),
-                    ),
-                  ),
-                  const SizedBox(height: 20),
-                  SizedBox(
-                    width: double.infinity,
-                    height: 50,
-                    child: ElevatedButton(
-                      onPressed: _isWorking ? null : _addStudentAccount,
-                      style: ElevatedButton.styleFrom(
-                        backgroundColor: Colors.orange,
-                        foregroundColor: Colors.white,
-                        shape: RoundedRectangleBorder(
-                          borderRadius: BorderRadius.circular(12),
-                        ),
-                      ),
-                      child: _isWorking
-                          ? const CircularProgressIndicator(color: Colors.white)
-                          : const Text(
-                              '학생 등록 완료',
-                              style: TextStyle(
-                                fontWeight: FontWeight.bold,
-                                fontSize: 15,
-                              ),
-                            ),
-                    ),
-                  ),
-                ],
-              ),
-            ),
-            const SizedBox(height: 36),
-
-            // 🏷️ 인디케이터 바 2 (삭제 권한 제어메뉴)
-            Row(
-              children: [
-                Container(
-                  width: 4,
-                  height: 16,
-                  decoration: BoxDecoration(
-                    color: Colors.red,
-                    borderRadius: BorderRadius.circular(2),
-                  ),
-                ),
-                const SizedBox(width: 8),
-                const Text(
-                  '위험 구역 (Account Reset)',
-                  style: TextStyle(
-                    fontSize: 18,
-                    fontWeight: FontWeight.bold,
-                    color: Colors.redAccent,
-                  ),
-                ),
-              ],
-            ),
-            const SizedBox(height: 16),
-
-            // 🚨 학생 삭제 트리거 카드
-            InkWell(
-              onTap: _showDeleteDialog,
-              borderRadius: BorderRadius.circular(24),
-              child: Container(
-                padding: const EdgeInsets.all(20),
-                decoration: BoxDecoration(
-                  color: Colors.red[50],
-                  borderRadius: BorderRadius.circular(24),
-                  border: Border.all(color: Colors.red.shade200),
-                ),
-                child: const Row(
-                  children: [
-                    Icon(
-                      Icons.delete_sweep_rounded,
-                      color: Colors.red,
-                      size: 32,
-                    ),
-                    SizedBox(width: 16),
-                    Expanded(
-                      child: Column(
-                        crossAxisAlignment: CrossAxisAlignment.start,
-                        children: [
-                          Text(
-                            '학생 계정 강제 원격 삭제',
-                            style: TextStyle(
-                              fontSize: 16,
-                              fontWeight: FontWeight.bold,
-                              color: Colors.red,
-                            ),
-                          ),
-                          SizedBox(height: 2),
-                          Text(
-                            '인증 초기화 및 DB 제거용',
-                            style: TextStyle(
-                              fontSize: 12,
-                              color: Colors.redAccent,
-                            ),
-                          ),
-                        ],
-                      ),
-                    ),
-                    Icon(
-                      Icons.arrow_forward_ios_rounded,
-                      color: Colors.red,
-                      size: 16,
-                    ),
-                  ],
-                ),
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}
diff --git a/lib/ui/admin_dashboard.dart b/lib/ui/admin_dashboard.dart
new file mode 100644
index 0000000..738c1d4
--- /dev/null
+++ b/lib/ui/admin_dashboard.dart
@@ -0,0 +1,142 @@
+// 🛠️ 시스템 관리자 대시보드 (UI 전용). 출석 DB 전체 초기화 버튼을 그린다.
+// 서버 통신/상태는 lib/function/admin_controller.dart가 담당한다.
+import 'package:flutter/material.dart';
+import '../function/admin_controller.dart';
+import 'login_screen.dart';
+
+// ==========================================
+// 🛠️ 5. 관리자 대시보드 (DB 초기화 암호 파라미터 보정 완료)
+// ==========================================
+class AdminDashboard extends StatefulWidget {
+  const AdminDashboard({super.key});
+
+  @override
+  State<AdminDashboard> createState() => _AdminDashboardState();
+}
+
+class _AdminDashboardState extends State<AdminDashboard> {
+  final AdminController _controller = AdminController();
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  Future<void> _resetDatabase() async {
+    final message = await _controller.resetDatabase();
+    if (!mounted) return;
+    ScaffoldMessenger.of(
+      context,
+    ).showSnackBar(SnackBar(content: Text(message)));
+  }
+
+  void _showResetConfirmDialog() {
+    showDialog(
+      context: context,
+      builder: (BuildContext dialogContext) {
+        return AlertDialog(
+          title: const Text(
+            '⚠️ DB 초기화 경고',
+            style: TextStyle(color: Colors.red, fontWeight: FontWeight.bold),
+          ),
+          content: const Text(
+            '모든 학생의 출석 및 휴대폰 제출 데이터가 영구적으로 삭제됩니다.\n\n정말 초기화하시겠습니까?',
+          ),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(dialogContext),
+              child: const Text('취소', style: TextStyle(color: Colors.grey)),
+            ),
+            ElevatedButton(
+              style: ElevatedButton.styleFrom(backgroundColor: Colors.red),
+              onPressed: () {
+                Navigator.pop(dialogContext);
+                _resetDatabase();
+              },
+              child: const Text(
+                '초기화 실행',
+                style: TextStyle(color: Colors.white),
+              ),
+            ),
+          ],
+        );
+      },
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListenableBuilder(
+      listenable: _controller,
+      builder: (context, _) {
+        return Scaffold(
+          appBar: AppBar(
+            title: const Text('🛠️ 관리자 시스템'),
+            backgroundColor: Colors.orange,
+            foregroundColor: Colors.white,
+            actions: [
+              IconButton(
+                icon: const Icon(Icons.logout),
+                onPressed: () => Navigator.pushReplacement(
+                  context,
+                  MaterialPageRoute(builder: (context) => const LoginScreen()),
+                ),
+              ),
+            ],
+          ),
+          body: Center(
+            child: Padding(
+              padding: const EdgeInsets.all(24.0),
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: [
+                  const Icon(
+                    Icons.admin_panel_settings,
+                    size: 100,
+                    color: Colors.orange,
+                  ),
+                  const SizedBox(height: 20),
+                  const Text(
+                    '데이터베이스 관리',
+                    style: TextStyle(fontSize: 22, fontWeight: FontWeight.bold),
+                  ),
+                  const SizedBox(height: 40),
+
+                  _controller.isLoading
+                      ? const CircularProgressIndicator(color: Colors.red)
+                      : SizedBox(
+                          width: double.infinity,
+                          height: 60,
+                          child: ElevatedButton.icon(
+                            style: ElevatedButton.styleFrom(
+                              backgroundColor: Colors.red[50],
+                              foregroundColor: Colors.red,
+                              side: const BorderSide(
+                                color: Colors.red,
+                                width: 2,
+                              ),
+                              shape: RoundedRectangleBorder(
+                                borderRadius: BorderRadius.circular(12),
+                              ),
+                            ),
+                            icon: const Icon(Icons.delete_forever, size: 28),
+                            label: const Text(
+                              '모든 출석 데이터 초기화',
+                              style: TextStyle(
+                                fontSize: 18,
+                                fontWeight: FontWeight.bold,
+                              ),
+                            ),
+                            onPressed: _showResetConfirmDialog,
+                          ),
+                        ),
+                ],
+              ),
+            ),
+          ),
+        );
+      },
+    );
+  }
+}
diff --git a/lib/ui/login_screen.dart b/lib/ui/login_screen.dart
new file mode 100644
index 0000000..ba9901d
--- /dev/null
+++ b/lib/ui/login_screen.dart
@@ -0,0 +1,435 @@
+// 🔑 로그인 화면 (UI 전용). 입력폼/다이얼로그/화면 이동만 담당한다.
+// 인증 로직/서버 통신은 lib/function/login_controller.dart가 담당한다.
+import 'package:flutter/material.dart';
+import '../function/login_controller.dart';
+import 'student_dashboard.dart';
+import 'teacher_dashboard.dart';
+import 'admin_dashboard.dart';
+import 'teacher_register_screen.dart';
+
+// -------------------------------------------------------------
+// 1. 로그인 화면 (LoginScreen)
+// -------------------------------------------------------------
+
+class LoginScreen extends StatefulWidget {
+  const LoginScreen({super.key});
+
+  @override
+  State<LoginScreen> createState() => _LoginScreenState();
+}
+
+class _LoginScreenState extends State<LoginScreen> {
+  final LoginController _controller = LoginController();
+  final TextEditingController _idController = TextEditingController();
+  final TextEditingController _pwController = TextEditingController();
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    _idController.dispose();
+    _pwController.dispose();
+    super.dispose();
+  }
+
+  Future<void> _login() async {
+    final result = await _controller.login(
+      _idController.text.trim(),
+      _pwController.text.trim(),
+    );
+    if (!mounted) return;
+
+    switch (result.outcome) {
+      case LoginOutcome.error:
+        _showErrorDialog(result.errorMessage!);
+        break;
+      case LoginOutcome.masterSuccess:
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(content: Text('👑 개발자 최고 권한으로 로그인되었습니다.')),
+        );
+        Navigator.pushReplacement(
+          context,
+          MaterialPageRoute(
+            builder: (context) => StudentDashboard(
+              studentId: result.studentId!,
+              studentName: result.name!,
+              isDeviceMatched: true,
+            ),
+          ),
+        );
+        break;
+      case LoginOutcome.needsPasswordChange:
+        _showFirstLoginPasswordDialog(
+          result.studentId!,
+          result.name!,
+          result.role!,
+          result.isDeviceMatched,
+        );
+        break;
+      case LoginOutcome.success:
+        ScaffoldMessenger.of(
+          context,
+        ).showSnackBar(SnackBar(content: Text('✅ ${result.name}님 환영합니다!')));
+        _navigateBasedOnRole(
+          result.role!,
+          result.studentId!,
+          result.name!,
+          result.isDeviceMatched,
+        );
+        break;
+    }
+  }
+
+  // 🛠️ 초기 비밀번호 변경 팝업창 (기기 매칭 데이터 파라미터 추가)
+  void _showFirstLoginPasswordDialog(
+    String studentId,
+    String name,
+    String role,
+    bool isDeviceMatched,
+  ) {
+    final TextEditingController newPwController = TextEditingController();
+
+    showDialog(
+      context: context,
+      barrierDismissible: false,
+      builder: (BuildContext dialogContext) {
+        bool isUpdating = false;
+
+        return StatefulBuilder(
+          builder: (context, setDialogState) {
+            return AlertDialog(
+              title: const Text(
+                '🔒 초기 비밀번호 변경',
+                style: TextStyle(fontWeight: FontWeight.bold),
+              ),
+              content: Column(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  const Text(
+                    '보안을 위해 새로운 비밀번호를 설정해 주세요.',
+                    style: TextStyle(color: Colors.redAccent),
+                  ),
+                  const SizedBox(height: 16),
+                  TextField(
+                    controller: newPwController,
+                    obscureText: true,
+                    decoration: const InputDecoration(
+                      labelText: '새 비밀번호',
+                      border: OutlineInputBorder(),
+                      prefixIcon: Icon(Icons.lock_reset),
+                    ),
+                  ),
+                ],
+              ),
+              actions: [
+                isUpdating
+                    ? const Padding(
+                        padding: EdgeInsets.only(right: 20.0),
+                        child: CircularProgressIndicator(),
+                      )
+                    : ElevatedButton(
+                        style: ElevatedButton.styleFrom(
+                          backgroundColor: Colors.indigo,
+                          foregroundColor: Colors.white,
+                        ),
+                        onPressed: () async {
+                          String newPassword = newPwController.text.trim();
+                          if (newPassword.isEmpty) {
+                            ScaffoldMessenger.of(context).showSnackBar(
+                              const SnackBar(
+                                content: Text('⚠️ 새 비밀번호를 입력해 주세요.'),
+                              ),
+                            );
+                            return;
+                          }
+
+                          setDialogState(() => isUpdating = true);
+
+                          final (success, message) = await _controller
+                              .changePassword(
+                                studentId: studentId,
+                                newPassword: newPassword,
+                              );
+                          setDialogState(() => isUpdating = false);
+
+                          if (success) {
+                            Navigator.pop(dialogContext);
+                            ScaffoldMessenger.of(context).showSnackBar(
+                              SnackBar(content: Text(message)),
+                            );
+                            _navigateBasedOnRole(
+                              role,
+                              studentId,
+                              name,
+                              isDeviceMatched,
+                            );
+                          } else {
+                            ScaffoldMessenger.of(context).showSnackBar(
+                              SnackBar(content: Text(message)),
+                            );
+                          }
+                        },
+                        child: const Text('변경하고 시작하기'),
+                      ),
+              ],
+            );
+          },
+        );
+      },
+    );
+  }
+
+  // 🆕 권한별 화면 이동시 기기 일치 여부 파라미터(`isDeviceMatched`) 수신 및 대시보드 전달
+  void _navigateBasedOnRole(
+    String role,
+    String studentId,
+    String name,
+    bool isDeviceMatched,
+  ) {
+    if (role == 'teacher') {
+      Navigator.pushReplacement(
+        context,
+        MaterialPageRoute(
+          builder: (context) =>
+              TeacherDashboard(teacherId: studentId, teacherName: name),
+        ),
+      );
+    } else if (role == 'admin') {
+      Navigator.pushReplacement(
+        context,
+        MaterialPageRoute(builder: (context) => const AdminDashboard()),
+      );
+    } else {
+      Navigator.pushReplacement(
+        context,
+        MaterialPageRoute(
+          builder: (context) => StudentDashboard(
+            studentId: studentId,
+            studentName: name,
+            isDeviceMatched: isDeviceMatched,
+          ),
+        ),
+      );
+    }
+  }
+
+  void _showErrorDialog(String message) {
+    showDialog(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text(
+          '⚠️ 인증 실패',
+          style: TextStyle(fontWeight: FontWeight.bold),
+        ),
+        content: Text(message),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(ctx),
+            child: const Text('확인'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  void _showLegacyPasswordDialog(
+    String title,
+    String correctPassword,
+    Widget nextPage,
+  ) {
+    final TextEditingController passwordController = TextEditingController();
+    showDialog(
+      context: context,
+      barrierDismissible: false,
+      builder: (BuildContext dialogContext) {
+        return AlertDialog(
+          title: Text('🔒 $title 권한 인증 (기존 방식)'),
+          content: TextField(
+            controller: passwordController,
+            obscureText: true,
+            keyboardType: TextInputType.number,
+            textInputAction: TextInputAction.done,
+            onSubmitted: (value) {
+              if (value == correctPassword) {
+                Navigator.pop(dialogContext);
+                Navigator.push(
+                  context,
+                  MaterialPageRoute(builder: (context) => nextPage),
+                );
+              } else {
+                ScaffoldMessenger.of(context).showSnackBar(
+                  const SnackBar(content: Text('❌ 비밀번호가 올바르지 않습니다.')),
+                );
+              }
+            },
+            decoration: const InputDecoration(
+              hintText: '비밀번호 4자리를 입력하세요',
+              border: OutlineInputBorder(),
+            ),
+          ),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(dialogContext),
+              child: const Text('취소', style: TextStyle(color: Colors.grey)),
+            ),
+            ElevatedButton(
+              onPressed: () {
+                if (passwordController.text == correctPassword) {
+                  Navigator.pop(dialogContext);
+                  Navigator.push(
+                    context,
+                    MaterialPageRoute(builder: (context) => nextPage),
+                  );
+                } else {
+                  ScaffoldMessenger.of(context).showSnackBar(
+                    const SnackBar(content: Text('❌ 비밀번호가 올바르지 않습니다.')),
+                  );
+                }
+              },
+              child: const Text('인증하기'),
+            ),
+          ],
+        );
+      },
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListenableBuilder(
+      listenable: _controller,
+      builder: (context, _) {
+        return Scaffold(
+          backgroundColor: Colors.grey[50],
+          body: Center(
+            child: SingleChildScrollView(
+              padding: const EdgeInsets.all(24.0),
+              child: ConstrainedBox(
+                constraints: const BoxConstraints(maxWidth: 420),
+                child: Column(
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  children: [
+                    const Icon(Icons.school, size: 80, color: Colors.indigo),
+                    const SizedBox(height: 16),
+                    const Text(
+                      '백산고등학교 모니터',
+                      style: TextStyle(
+                        fontSize: 26,
+                        fontWeight: FontWeight.bold,
+                        color: Colors.indigo,
+                      ),
+                    ),
+                    const SizedBox(height: 8),
+                    const Text(
+                      '학생 편의 및 학교생활 도우미',
+                      style: TextStyle(color: Colors.grey, fontSize: 15),
+                    ),
+                    const SizedBox(height: 40),
+                    TextField(
+                      controller: _idController,
+                      textInputAction: TextInputAction.next,
+                      decoration: const InputDecoration(
+                        labelText: '학번 또는 교직원 번호',
+                        border: OutlineInputBorder(),
+                        prefixIcon: Icon(Icons.person),
+                      ),
+                    ),
+                    const SizedBox(height: 16),
+                    TextField(
+                      controller: _pwController,
+                      obscureText: true,
+                      textInputAction: TextInputAction.done,
+                      onSubmitted: (_) => _login(),
+                      decoration: const InputDecoration(
+                        labelText: '비밀번호',
+                        border: OutlineInputBorder(),
+                        prefixIcon: Icon(Icons.lock),
+                      ),
+                    ),
+                    const SizedBox(height: 24),
+                    _controller.isLoading
+                        ? const CircularProgressIndicator()
+                        : SizedBox(
+                            width: double.infinity,
+                            height: 55,
+                            child: ElevatedButton(
+                              style: ElevatedButton.styleFrom(
+                                backgroundColor: Colors.indigo,
+                                foregroundColor: Colors.white,
+                                shape: RoundedRectangleBorder(
+                                  borderRadius: BorderRadius.circular(12),
+                                ),
+                              ),
+                              onPressed: _login,
+                              child: const Text(
+                                '로그인',
+                                style: TextStyle(
+                                  fontSize: 18,
+                                  fontWeight: FontWeight.bold,
+                                ),
+                              ),
+                            ),
+                          ),
+                    const SizedBox(height: 4),
+                    TextButton(
+                      onPressed: () => Navigator.push(
+                        context,
+                        MaterialPageRoute(
+                          builder: (context) => const TeacherRegisterScreen(),
+                        ),
+                      ),
+                      child: const Text(
+                        '👨‍🏫 선생님이신가요? 교사 회원가입 하기',
+                        style: TextStyle(
+                          color: Colors.indigo,
+                          fontWeight: FontWeight.bold,
+                        ),
+                      ),
+                    ),
+                    const Divider(height: 40),
+                    Row(
+                      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+                      children: [
+                        TextButton.icon(
+                          icon: const Icon(
+                            Icons.gavel,
+                            size: 18,
+                            color: Colors.grey,
+                          ),
+                          label: const Text(
+                            '교사 간편인증',
+                            style: TextStyle(color: Colors.grey),
+                          ),
+                          onPressed: () => _showLegacyPasswordDialog(
+                            '선생님',
+                            '1234',
+                            const TeacherDashboard(),
+                          ),
+                        ),
+                        TextButton.icon(
+                          icon: const Icon(
+                            Icons.settings,
+                            size: 18,
+                            color: Colors.grey,
+                          ),
+                          label: const Text(
+                            '관리자 간편인증',
+                            style: TextStyle(color: Colors.grey),
+                          ),
+                          onPressed: () => _showLegacyPasswordDialog(
+                            '시스템 관리자',
+                            '4936',
+                            const AdminDashboard(),
+                          ),
+                        ),
+                      ],
+                    ),
+                  ],
+                ),
+              ),
+            ),
+          ),
+        );
+      },
+    );
+  }
+}
diff --git a/lib/ui/nfc_poccket_checkin_screen.dart b/lib/ui/nfc_poccket_checkin_screen.dart
new file mode 100644
index 0000000..20c042f
--- /dev/null
+++ b/lib/ui/nfc_poccket_checkin_screen.dart
@@ -0,0 +1,236 @@
+// 📲 자습실 NFC 출석체크 화면 (UI 전용). 태깅 상태 화면/팝업/스낵바만 그린다.
+// NFC 세션, 서버 통신, 백그라운드 감시 연동은
+// lib/function/nfc_pocket_checkin_controller.dart가 담당한다.
+import 'package:flutter/material.dart';
+import '../function/nfc_pocket_checkin_controller.dart';
+
+class NfcPocketCheckInScreen extends StatefulWidget {
+  final String studentId; // 로그인된 학생 학번 (예: "2061")
+  final String studentName; // 로그인된 학생 이름 (예: "시후")
+
+  const NfcPocketCheckInScreen({
+    super.key,
+    required this.studentId,
+    required this.studentName,
+  });
+
+  @override
+  State<NfcPocketCheckInScreen> createState() => _NfcPocketCheckInScreenState();
+}
+
+class _NfcPocketCheckInScreenState extends State<NfcPocketCheckInScreen> {
+  late final NfcPocketCheckinController _controller;
+  bool _isDialogOpen = false; // 출석/위반 팝업이 겹쳐서 뜨는 것을 막기 위한 플래그
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = NfcPocketCheckinController(
+      studentId: widget.studentId,
+      studentName: widget.studentName,
+      onMessage: _handleMessage,
+      onCheckInSuccess: _showSuccessDialog,
+      onViolationDetected: _showViolationDialog,
+    );
+    _controller.init();
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  void _handleMessage(String text, WatchMessageLevel level) {
+    final Color color = switch (level) {
+      WatchMessageLevel.info => Colors.blueGrey,
+      WatchMessageLevel.success => Colors.green,
+      WatchMessageLevel.warning => Colors.orange,
+      WatchMessageLevel.error => Colors.red,
+    };
+    _showSnackBar(text, color);
+  }
+
+  /// 이미 떠 있는 팝업(출석 완료/무단반출 감지)이 있으면 새 팝업을 띄우기 전에 먼저 닫는다.
+  /// (태깅→반출→재태깅이 빠르게 반복되면 팝업이 여러 개 겹쳐 쌓이는 것을 방지)
+  void _closeAnyOpenDialog() {
+    if (_isDialogOpen && mounted) {
+      Navigator.of(context, rootNavigator: true).pop();
+    }
+    _isDialogOpen = false;
+  }
+
+  void _showViolationDialog(String? pocketNumber) {
+    if (!mounted) return;
+    _closeAnyOpenDialog();
+    _isDialogOpen = true;
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        backgroundColor: Colors.red[50],
+        title: const Text(
+          "🚨 무단 반출 감지",
+          style: TextStyle(color: Colors.red, fontWeight: FontWeight.bold),
+        ),
+        content: Text(
+          "[${pocketNumber ?? _controller.activePocketNumber}] 주머니에서 휴대폰이 꺼내진 것으로 감지되었습니다.\n담당 선생님께 알림이 전송되었습니다.",
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context),
+            child: const Text("확인"),
+          ),
+        ],
+      ),
+    ).then((_) => _isDialogOpen = false);
+  }
+
+  /// 🎊 출석 성공 알림창
+  void _showSuccessDialog(String pocketNumber) {
+    if (!mounted) return;
+    _closeAnyOpenDialog();
+    _isDialogOpen = true;
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text("🎉 자습실 출석 완료!"),
+        content: Text(
+          "${widget.studentName} 학생!\n[$pocketNumber] 주머니 출석이 확인되었습니다.\n\n폰을 주머니에 쏙 넣고 자습에 집중해 주세요! ✏️",
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context),
+            child: const Text("확인"),
+          ),
+        ],
+      ),
+    ).then((_) => _isDialogOpen = false);
+  }
+
+  void _showSnackBar(String text, Color color) {
+    if (!mounted) return;
+    ScaffoldMessenger.of(
+      context,
+    ).showSnackBar(SnackBar(content: Text(text), backgroundColor: color));
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListenableBuilder(
+      listenable: _controller,
+      builder: (context, _) {
+        if (_controller.isWatching) {
+          return _buildPocketWatchScreen();
+        }
+
+        return Scaffold(
+          appBar: AppBar(
+            title: const Text(
+              "자습실 NFC 출석체크",
+              style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
+            ),
+            backgroundColor: const Color.fromARGB(255, 48, 48, 52),
+          ),
+          body: Center(
+            child: Padding(
+              padding: const EdgeInsets.all(24.0),
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: [
+                  // NFC 애니메이션 아이콘
+                  Icon(
+                    _controller.isProcessing ? Icons.sync : Icons.nfc,
+                    size: 100,
+                    color: _controller.isProcessing
+                        ? Colors.orange
+                        : Colors.blueAccent,
+                  ),
+                  const SizedBox(height: 30),
+
+                  // 상태 메시지 표시
+                  Text(
+                    _controller.statusMessage,
+                    textAlign: TextAlign.center,
+                    style: TextStyle(
+                      fontSize: 18,
+                      fontWeight: FontWeight.bold,
+                      color: _controller.isProcessing
+                          ? Colors.orange
+                          : Colors.black87,
+                    ),
+                  ),
+                  const SizedBox(height: 15),
+
+                  const Text(
+                    "자기 주머니 번호 숫자에 폰 뒷면을 '톡' 대면\n자동으로 출석 처리됩니다.",
+                    textAlign: TextAlign.center,
+                    style: TextStyle(color: Colors.grey, fontSize: 14),
+                  ),
+                ],
+              ),
+            ),
+          ),
+        );
+      },
+    );
+  }
+
+  /// 💳 삼성페이 결제창 느낌의 전체화면 "주머니 제출 모드" 안내 UI
+  /// (실제 감시 로직은 pocket_watch_service.dart의 백그라운드 서비스가 담당하므로,
+  ///  이 화면은 상태를 보여주고 화면을 꺼도 된다는 것만 안내한다.)
+  Widget _buildPocketWatchScreen() {
+    return Scaffold(
+      backgroundColor: const Color(0xFF0B1120),
+      body: SafeArea(
+        child: Padding(
+          padding: const EdgeInsets.all(32.0),
+          child: Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: [
+              Container(
+                width: 160,
+                height: 160,
+                decoration: BoxDecoration(
+                  shape: BoxShape.circle,
+                  color: Colors.greenAccent.withValues(alpha: 0.15),
+                  border: Border.all(color: Colors.greenAccent, width: 3),
+                ),
+                child: const Icon(
+                  Icons.shield_rounded,
+                  size: 72,
+                  color: Colors.greenAccent,
+                ),
+              ),
+              const SizedBox(height: 40),
+              Text(
+                _controller.activePocketNumber ?? "",
+                style: const TextStyle(
+                  color: Colors.white54,
+                  fontSize: 14,
+                  letterSpacing: 2,
+                ),
+              ),
+              const SizedBox(height: 12),
+              Text(
+                _controller.statusMessage,
+                textAlign: TextAlign.center,
+                style: const TextStyle(
+                  color: Colors.white,
+                  fontSize: 20,
+                  fontWeight: FontWeight.bold,
+                  height: 1.4,
+                ),
+              ),
+              const SizedBox(height: 8),
+              const Text(
+                "📴 화면을 꺼도 감시는 계속됩니다.\n알림바에서 상태를 확인할 수 있어요.\n(폰을 꺼내 다시 태깅하면 반출 처리됩니다)",
+                textAlign: TextAlign.center,
+                style: TextStyle(color: Colors.white38, fontSize: 13),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
diff --git a/lib/ui/nfc_tag_writer_screen.dart b/lib/ui/nfc_tag_writer_screen.dart
new file mode 100644
index 0000000..6b8b5ee
--- /dev/null
+++ b/lib/ui/nfc_tag_writer_screen.dart
@@ -0,0 +1,114 @@
+// 🏷️ (관리자용) 주머니 NFC 스티커 초기 설정 화면 (UI 전용). 빈 태그에 "POCKET_번호"를 쓰는
+// 버튼/입력폼을 그린다. NFC 세션/서버 통신은 lib/function/nfc_tag_writer_controller.dart가 담당한다.
+import 'package:flutter/material.dart';
+import '../function/nfc_tag_writer_controller.dart';
+
+class NfcTagWriterScreen extends StatefulWidget {
+  const NfcTagWriterScreen({super.key});
+
+  @override
+  State<NfcTagWriterScreen> createState() => _NfcTagWriterScreenState();
+}
+
+class _NfcTagWriterScreenState extends State<NfcTagWriterScreen> {
+  final TextEditingController _numberController = TextEditingController(
+    text: "1",
+  );
+  late final NfcTagWriterController _controller;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = NfcTagWriterController(
+      onMessage: _showSnackBar,
+      onNextNumberSuggested: (next) => _numberController.text = next,
+    );
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    _numberController.dispose();
+    super.dispose();
+  }
+
+  void _showSnackBar(String text, bool isError) {
+    if (!mounted) return;
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: Text(text),
+        backgroundColor: isError ? Colors.red : Colors.green,
+      ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListenableBuilder(
+      listenable: _controller,
+      builder: (context, _) {
+        final bool isWriting = _controller.isWriting;
+        return Scaffold(
+          appBar: AppBar(
+            title: const Text("🏷️ NFC 주머니 태그 쓰기"),
+            backgroundColor: Colors.deepPurple,
+            foregroundColor: Colors.white,
+          ),
+          body: Padding(
+            padding: const EdgeInsets.all(24.0),
+            child: Column(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                TextField(
+                  controller: _numberController,
+                  keyboardType: TextInputType.number,
+                  enabled: !isWriting,
+                  decoration: const InputDecoration(
+                    labelText: "주머니 번호",
+                    prefixText: "POCKET_",
+                    border: OutlineInputBorder(),
+                  ),
+                ),
+                const SizedBox(height: 32),
+                Icon(
+                  isWriting ? Icons.nfc : Icons.edit_note_rounded,
+                  size: 80,
+                  color: isWriting ? Colors.orange : Colors.deepPurple,
+                ),
+                const SizedBox(height: 16),
+                Text(
+                  _controller.statusMessage,
+                  textAlign: TextAlign.center,
+                  style: const TextStyle(fontSize: 15),
+                ),
+                const SizedBox(height: 32),
+                SizedBox(
+                  width: double.infinity,
+                  height: 55,
+                  child: ElevatedButton(
+                    style: ElevatedButton.styleFrom(
+                      backgroundColor: Colors.deepPurple,
+                      foregroundColor: Colors.white,
+                    ),
+                    onPressed: isWriting
+                        ? null
+                        : () => _controller.startWriteSession(
+                            _numberController.text.trim(),
+                          ),
+                    child: Text(
+                      isWriting ? "태그를 기다리는 중..." : "쓰기 시작",
+                      style: const TextStyle(
+                        fontSize: 16,
+                        fontWeight: FontWeight.bold,
+                      ),
+                    ),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        );
+      },
+    );
+  }
+}
diff --git a/lib/ui/student_dashboard.dart b/lib/ui/student_dashboard.dart
new file mode 100644
index 0000000..6f91fa6
--- /dev/null
+++ b/lib/ui/student_dashboard.dart
@@ -0,0 +1,494 @@
+// 🎓 학생 대시보드 (UI 전용). NFC 주머니 체크인 진입, 실시간 학교 상황 안내,
+// 개발자 마스터 계정 전용 관리 메뉴(현황/DB제어/계정관리/삭제) 카드를 그린다.
+// 계정 삭제 서버 통신은 lib/function/student_dashboard_controller.dart가 담당한다.
+import 'package:flutter/material.dart';
+import '../function/student_dashboard_controller.dart';
+import 'nfc_poccket_checkin_screen.dart';
+import 'login_screen.dart';
+import 'teacher_attendance_page.dart';
+import 'admin_dashboard.dart';
+import 'student_management_screen.dart';
+import 'nfc_tag_writer_screen.dart';
+
+// -------------------------------------------------------------
+// 2. 학생 대시보드 (StudentDashboard)
+// -------------------------------------------------------------
+
+class StudentDashboard extends StatefulWidget {
+  final String studentId;
+  final String studentName;
+  final bool isDeviceMatched; // 🆕 [변경] 기기 UUID가 매칭되었는지 확인하는 변수 추가
+
+  const StudentDashboard({
+    super.key,
+    required this.studentId,
+    required this.studentName,
+    required this.isDeviceMatched, // 🆕 [변경] 필수 매개변수로 등록
+  });
+
+  @override
+  State<StudentDashboard> createState() => _StudentDashboardState();
+}
+
+class _StudentDashboardState extends State<StudentDashboard> {
+  final StudentDashboardController _controller = StudentDashboardController();
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  // 1️⃣ NFC 태그 카드 → 실제 NFC 주머니 체크인 화면으로 이동
+  void _openPocketCheckIn(BuildContext context) {
+    Navigator.push(
+      context,
+      MaterialPageRoute(
+        builder: (context) => NfcPocketCheckInScreen(
+          studentId: widget.studentId,
+          studentName: widget.studentName,
+        ),
+      ),
+    );
+  }
+
+  // 2️⃣ [기존 동일] 마스터 계정 전용 회원 삭제 버튼 동작
+  Future<void> _deleteUser(String userId) async {
+    final (_, message) = await _controller.deleteUser(userId);
+    if (!mounted) return;
+    ScaffoldMessenger.of(
+      context,
+    ).showSnackBar(SnackBar(content: Text(message)));
+  }
+
+  // 3️⃣ [기존 동일] 학번/교직원 번호를 입력받는 모던 팝업창(Dialog)
+  void _showDeleteUserDialog(BuildContext context) {
+    final TextEditingController idController = TextEditingController();
+
+    showDialog(
+      context: context,
+      builder: (context) {
+        return AlertDialog(
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(24),
+          ),
+          title: const Row(
+            children: [
+              Icon(Icons.warning_amber_rounded, color: Colors.redAccent),
+              SizedBox(width: 10),
+              Text(
+                '계정 강제 삭제',
+                style: TextStyle(fontWeight: FontWeight.bold, fontSize: 18),
+              ),
+            ],
+          ),
+          content: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              const Text(
+                '학생의 학번 또는 교사의 교직원 번호를 입력하세요.\nDB에서 해당 계정과 토큰이 즉시 삭제됩니다.',
+                style: TextStyle(
+                  color: Colors.black54,
+                  fontSize: 13,
+                  height: 1.4,
+                ),
+              ),
+              const SizedBox(height: 16),
+              TextField(
+                controller: idController,
+                decoration: InputDecoration(
+                  labelText: '학번 또는 교직원 번호',
+                  hintText: '예: 201101 또는 T1001',
+                  labelStyle: TextStyle(color: Colors.red[400]),
+                  focusedBorder: OutlineInputBorder(
+                    borderRadius: BorderRadius.circular(16),
+                    borderSide: BorderSide(color: Colors.red[400]!, width: 2),
+                  ),
+                  border: OutlineInputBorder(
+                    borderRadius: BorderRadius.circular(16),
+                  ),
+                  prefixIcon: const Icon(Icons.person_remove_alt_1_rounded),
+                ),
+              ),
+            ],
+          ),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(context),
+              child: const Text(
+                '취소',
+                style: TextStyle(
+                  color: Colors.grey,
+                  fontWeight: FontWeight.bold,
+                ),
+              ),
+            ),
+            ElevatedButton(
+              onPressed: () {
+                final inputId = idController.text.trim();
+                if (inputId.isNotEmpty) {
+                  Navigator.pop(context);
+                  _deleteUser(inputId);
+                }
+              },
+              style: ElevatedButton.styleFrom(
+                backgroundColor: Colors.redAccent,
+                foregroundColor: Colors.white,
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(12),
+                ),
+                elevation: 0,
+              ),
+              child: const Text(
+                '삭제 실행',
+                style: TextStyle(fontWeight: FontWeight.bold),
+              ),
+            ),
+          ],
+        );
+      },
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListenableBuilder(
+      listenable: _controller,
+      builder: (context, _) {
+        final bool isDeveloper = widget.studentId == "2061";
+
+        return Scaffold(
+          backgroundColor: Colors.grey[100],
+          appBar: AppBar(
+            title: Text(
+              isDeveloper ? '👑 MASTER CONTROL' : '🎓 STUDENT PORTAL',
+              style: const TextStyle(
+                fontWeight: FontWeight.bold,
+                letterSpacing: 1.2,
+              ),
+            ),
+            centerTitle: true,
+            backgroundColor: isDeveloper
+                ? Colors.deepPurple[700]
+                : Colors.indigo[700],
+            foregroundColor: Colors.white,
+            elevation: 0,
+            actions: [
+              IconButton(
+                icon: const Icon(Icons.logout_rounded),
+                onPressed: () => Navigator.pushReplacement(
+                  context,
+                  MaterialPageRoute(builder: (context) => const LoginScreen()),
+                ),
+              ),
+            ],
+          ),
+          body: SingleChildScrollView(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Container(
+                  width: double.infinity,
+                  padding: const EdgeInsets.symmetric(
+                    horizontal: 24,
+                    vertical: 28,
+                  ),
+                  decoration: BoxDecoration(
+                    color: isDeveloper
+                        ? Colors.deepPurple[700]
+                        : Colors.indigo[700],
+                    borderRadius: const BorderRadius.only(
+                      bottomLeft: Radius.circular(32),
+                      bottomRight: Radius.circular(32),
+                    ),
+                  ),
+                  child: Row(
+                    children: [
+                      Container(
+                        padding: const EdgeInsets.all(4),
+                        decoration: const BoxDecoration(
+                          color: Colors.white,
+                          shape: BoxShape.circle,
+                        ),
+                        child: CircleAvatar(
+                          radius: 30,
+                          backgroundColor: isDeveloper
+                              ? Colors.deepPurple[50]
+                              : Colors.indigo[50],
+                          child: Icon(
+                            isDeveloper
+                                ? Icons.admin_panel_settings_rounded
+                                : Icons.school_rounded,
+                            size: 32,
+                            color: isDeveloper
+                                ? Colors.deepPurple
+                                : Colors.indigo,
+                          ),
+                        ),
+                      ),
+                      const SizedBox(width: 18),
+                      Column(
+                        crossAxisAlignment: CrossAxisAlignment.start,
+                        children: [
+                          Text(
+                            '${widget.studentName} 님',
+                            style: const TextStyle(
+                              fontSize: 22,
+                              fontWeight: FontWeight.bold,
+                              color: Colors.white,
+                            ),
+                          ),
+                          const SizedBox(height: 4),
+                          Text(
+                            isDeveloper
+                                ? '최고 관리 권한 활성화됨'
+                                : '학번: ${widget.studentId} | 인증 완료',
+                            style: TextStyle(
+                              color: Colors.white.withValues(alpha: 0.8),
+                              fontSize: 14,
+                            ),
+                          ),
+                        ],
+                      ),
+                    ],
+                  ),
+                ),
+                const SizedBox(height: 32),
+                Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 24.0),
+                  child: Row(
+                    children: [
+                      Container(
+                        width: 4,
+                        height: 18,
+                        decoration: BoxDecoration(
+                          color: isDeveloper
+                              ? Colors.deepPurple
+                              : Colors.indigo,
+                          borderRadius: BorderRadius.circular(2),
+                        ),
+                      ),
+                      const SizedBox(width: 10),
+                      const Text(
+                        '스마트 관리 시스템 메뉴',
+                        style: TextStyle(
+                          fontSize: 18,
+                          fontWeight: FontWeight.bold,
+                          color: Colors.black87,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                const SizedBox(height: 16),
+                Padding(
+                  padding: const EdgeInsets.symmetric(horizontal: 24.0),
+                  child: GridView.count(
+                    shrinkWrap: true,
+                    physics: const NeverScrollableScrollPhysics(),
+                    crossAxisCount: 2,
+                    crossAxisSpacing: 16,
+                    mainAxisSpacing: 16,
+                    childAspectRatio: 0.95,
+                    children: [
+                      // 🆕 [변경 지점] 기기가 일치하면 정상 활성화, 일치하지 않으면 자물쇠Lock 처리
+                      if (isDeveloper || widget.studentId != "2061")
+                        _buildModernCard(
+                          icon: widget.isDeviceMatched
+                              ? Icons.contactless_rounded
+                              : Icons.lock_rounded,
+                          title: 'NFC 태그',
+                          subtitle: widget.isDeviceMatched
+                              ? '출석 및 폰 수거 완료'
+                              : '⚠️ 본인 인증 기기 전용',
+                          color: widget.isDeviceMatched
+                              ? Colors.blue
+                              : Colors.grey[400]!,
+                          onTap: widget.isDeviceMatched
+                              ? () => _openPocketCheckIn(context)
+                              : () {
+                                  ScaffoldMessenger.of(context).showSnackBar(
+                                    const SnackBar(
+                                      content: Text(
+                                        '🚨 대리 출석 방지를 위해 등록된 본인 스마트폰에서만 출석 가능합니다.',
+                                      ),
+                                    ),
+                                  );
+                                },
+                          isActionButton: widget.isDeviceMatched,
+                          isLoading: _controller.isLoading,
+                        ),
+
+                      // 🆕 [추가 지점] 기기 일치 여부 상관없이 태블릿에서도 누구나 확인 가능한 학교 상황판 카드
+                      _buildModernCard(
+                        icon: Icons.fastfood_rounded,
+                        title: '실시간 학교 상황',
+                        subtitle: '급식실 줄 & 매점 재고 확인',
+                        color: Colors.orange[700]!,
+                        onTap: () {
+                          ScaffoldMessenger.of(context).showSnackBar(
+                            const SnackBar(
+                              content: Text('🍔 실시간 학교 상황 페이지로 이동합니다.'),
+                            ),
+                          );
+                        },
+                      ),
+
+                      if (isDeveloper)
+                        _buildModernCard(
+                          icon: Icons.monitor_heart_rounded,
+                          title: '실시간 현황',
+                          subtitle: '교사용 수거 모니터링',
+                          color: Colors.teal,
+                          onTap: () => Navigator.push(
+                            context,
+                            MaterialPageRoute(
+                              builder: (context) =>
+                                  const TeacherAttendancePage(),
+                            ),
+                          ),
+                        ),
+                      if (isDeveloper)
+                        _buildModernCard(
+                          icon: Icons.terminal_rounded,
+                          title: '서버 DB 제어',
+                          subtitle: '시스템 원격 초기화',
+                          color: Colors.amber[800]!,
+                          onTap: () => Navigator.push(
+                            context,
+                            MaterialPageRoute(
+                              builder: (context) => const AdminDashboard(),
+                            ),
+                          ),
+                        ),
+                      if (isDeveloper)
+                        _buildModernCard(
+                          icon: Icons.add_moderator_rounded,
+                          title: '학생 계정 관리',
+                          subtitle: 'UUID 리셋 및 승인',
+                          color: Colors.purple,
+                          onTap: () => Navigator.push(
+                            context,
+                            MaterialPageRoute(
+                              builder: (context) =>
+                                  const StudentManagementScreen(),
+                            ),
+                          ),
+                        ),
+                      if (isDeveloper)
+                        _buildModernCard(
+                          icon: Icons.delete_sweep_rounded,
+                          title: '계정 강제 삭제',
+                          subtitle: '학생 및 교사 DB 삭제',
+                          color: Colors.red[600]!,
+                          onTap: () => _showDeleteUserDialog(context),
+                        ),
+                      if (isDeveloper)
+                        _buildModernCard(
+                          icon: Icons.edit_note_rounded,
+                          title: 'NFC 태그 쓰기',
+                          subtitle: '주머니 스티커 초기 설정',
+                          color: Colors.deepPurple,
+                          onTap: () => Navigator.push(
+                            context,
+                            MaterialPageRoute(
+                              builder: (context) => const NfcTagWriterScreen(),
+                            ),
+                          ),
+                        ),
+                    ],
+                  ),
+                ),
+                const SizedBox(height: 32),
+              ],
+            ),
+          ),
+        );
+      },
+    );
+  }
+
+  // 5️⃣ [카드 디자인 위젯] - 기존 형태 완전 보존
+  Widget _buildModernCard({
+    required IconData icon,
+    required String title,
+    required String subtitle,
+    required Color color,
+    required VoidCallback onTap,
+    bool isActionButton = false,
+    bool isLoading = false,
+  }) {
+    return InkWell(
+      onTap: isLoading ? null : onTap,
+      borderRadius: BorderRadius.circular(24),
+      child: Ink(
+        padding: const EdgeInsets.all(20),
+        decoration: BoxDecoration(
+          color: Colors.white,
+          borderRadius: BorderRadius.circular(24),
+          boxShadow: [
+            BoxShadow(
+              color: Colors.black.withValues(alpha: 0.04),
+              blurRadius: 16,
+              offset: const Offset(0, 4),
+            ),
+          ],
+        ),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          mainAxisAlignment: MainAxisAlignment.spaceBetween,
+          children: [
+            Container(
+              padding: const EdgeInsets.all(12),
+              decoration: BoxDecoration(
+                color: color.withValues(alpha: 0.1),
+                borderRadius: BorderRadius.circular(16),
+              ),
+              child: Icon(icon, color: color, size: 28),
+            ),
+            Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Row(
+                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                  children: [
+                    Text(
+                      title,
+                      style: const TextStyle(
+                        fontSize: 16,
+                        fontWeight: FontWeight.bold,
+                        color: Colors.black87,
+                      ),
+                    ),
+                    if (isLoading)
+                      const SizedBox(
+                        width: 16,
+                        height: 16,
+                        child: CircularProgressIndicator(strokeWidth: 2),
+                      )
+                    else if (isActionButton)
+                      Icon(
+                        Icons.touch_app_rounded,
+                        size: 16,
+                        color: color.withValues(alpha: 0.5),
+                      ),
+                  ],
+                ),
+                const SizedBox(height: 4),
+                Text(
+                  subtitle,
+                  style: TextStyle(
+                    fontSize: 12,
+                    color: Colors.grey[500],
+                    height: 1.2,
+                  ),
+                ),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
diff --git a/lib/ui/student_management_screen.dart b/lib/ui/student_management_screen.dart
new file mode 100644
index 0000000..77232d2
--- /dev/null
+++ b/lib/ui/student_management_screen.dart
@@ -0,0 +1,307 @@
+// 🔐 (마스터 계정용) 학생 계정 및 기기 관리 화면 (UI 전용). 기기 UUID 초기화/계정 삭제/생성 다이얼로그를 그린다.
+// 서버 통신/상태는 lib/function/student_management_controller.dart가 담당한다.
+import 'package:flutter/material.dart';
+import '../function/student_management_controller.dart';
+
+// ==========================================
+// 🔐 6. 학생 계정 및 기기 관리 화면 (기기 리셋 + 계정 삭제 완본)
+// ==========================================
+class StudentManagementScreen extends StatefulWidget {
+  const StudentManagementScreen({super.key});
+
+  @override
+  State<StudentManagementScreen> createState() =>
+      _StudentManagementScreenState();
+}
+
+class _StudentManagementScreenState extends State<StudentManagementScreen> {
+  final StudentManagementController _controller =
+      StudentManagementController();
+
+  @override
+  void initState() {
+    super.initState();
+    _controller.init();
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  Future<void> _fetchStudents() async {
+    final error = await _controller.fetchStudents();
+    if (error != null && mounted) {
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(error)));
+    }
+  }
+
+  // 🌐 서버로 기기 초기화(리셋) 명령 보내기
+  void _resetDevice(String studentId, String studentName) {
+    showDialog(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text(
+          '⚠️ 기기 잠금 해제',
+          style: TextStyle(fontWeight: FontWeight.bold, color: Colors.purple),
+        ),
+        content: Text('$studentName 학생의 스마트폰 기기 등록을 초기화하시겠습니까?'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(ctx),
+            child: const Text('취소', style: TextStyle(color: Colors.grey)),
+          ),
+          ElevatedButton(
+            style: ElevatedButton.styleFrom(
+              backgroundColor: Colors.purple,
+              foregroundColor: Colors.white,
+            ),
+            onPressed: () async {
+              Navigator.pop(ctx);
+              final (_, message) = await _controller.resetDevice(
+                studentId,
+                studentName,
+              );
+              if (!mounted) return;
+              ScaffoldMessenger.of(
+                context,
+              ).showSnackBar(SnackBar(content: Text(message)));
+            },
+            child: const Text('초기화 승인'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  // 🌐 [새 기능] 서버로 계정 완전 삭제 명령 보내기
+  void _deleteUser(String studentId, String studentName) {
+    showDialog(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text(
+          '🚨 계정 완전 삭제 경고',
+          style: TextStyle(fontWeight: FontWeight.bold, color: Colors.red),
+        ),
+        content: Text(
+          '정말로 $studentName ($studentId) 학생의 계정을 시스템에서 탈퇴(삭제)시키겠습니까?\n\n이 작업은 되돌릴 수 없으며, 해당 학생은 다시 회원가입을 진행해야 합니다.',
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(ctx),
+            child: const Text('취소', style: TextStyle(color: Colors.grey)),
+          ),
+          ElevatedButton(
+            style: ElevatedButton.styleFrom(
+              backgroundColor: Colors.red,
+              foregroundColor: Colors.white,
+            ),
+            onPressed: () async {
+              Navigator.pop(ctx);
+              final (_, message) = await _controller.deleteUser(
+                studentId,
+                studentName,
+              );
+              if (!mounted) return;
+              ScaffoldMessenger.of(
+                context,
+              ).showSnackBar(SnackBar(content: Text(message)));
+            },
+            child: const Text('영구 삭제'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  void _showCreateUserDialog() {
+    final idController = TextEditingController();
+    final nameController = TextEditingController();
+
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: const Text('👤 신규 학생 계정 추가'),
+        content: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            TextField(
+              controller: idController,
+              decoration: const InputDecoration(labelText: '학번 입력 (예: 20101)'),
+              keyboardType: TextInputType.number,
+            ),
+            const SizedBox(height: 8),
+            TextField(
+              controller: nameController,
+              decoration: const InputDecoration(labelText: '학생 이름 입력'),
+            ),
+          ],
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(context),
+            child: const Text('취소'),
+          ),
+          ElevatedButton(
+            onPressed: () async {
+              String studentId = idController.text.trim();
+              String name = nameController.text.trim();
+
+              if (studentId.isEmpty || name.isEmpty) {
+                ScaffoldMessenger.of(context).showSnackBar(
+                  const SnackBar(content: Text('⚠️ 학번과 이름을 모두 입력하세요.')),
+                );
+                return;
+              }
+
+              final (success, message) = await _controller.createUser(
+                studentId,
+                name,
+              );
+              if (!mounted) return;
+              if (success) {
+                Navigator.pop(context); // 팝업 닫기
+              }
+              ScaffoldMessenger.of(
+                context,
+              ).showSnackBar(SnackBar(content: Text(message)));
+            },
+            child: const Text('생성'),
+          ),
+        ],
+      ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListenableBuilder(
+      listenable: _controller,
+      builder: (context, _) {
+        final realStudents = _controller.students;
+        return Scaffold(
+          backgroundColor: Colors.grey[50],
+          appBar: AppBar(
+            title: const Text(
+              '학생 계정 및 기기 관리',
+              style: TextStyle(fontWeight: FontWeight.bold),
+            ),
+            backgroundColor: Colors.purple,
+            foregroundColor: Colors.white,
+            actions: [
+              IconButton(
+                icon: const Icon(Icons.person_add_alt_1_rounded),
+                onPressed: () => _showCreateUserDialog(),
+              ),
+              IconButton(icon: const Icon(Icons.refresh), onPressed: _fetchStudents),
+            ],
+          ),
+          body: _controller.isLoading
+              ? const Center(
+                  child: CircularProgressIndicator(color: Colors.purple),
+                )
+              : realStudents.isEmpty
+              ? const Center(
+                  child: Text(
+                    '가입된 학생 계정이 없습니다.',
+                    style: TextStyle(color: Colors.grey, fontSize: 16),
+                  ),
+                )
+              : ListView.builder(
+                  padding: const EdgeInsets.all(16),
+                  itemCount: realStudents.length,
+                  itemBuilder: (context, index) {
+                    final student = realStudents[index];
+                    final bool needsReset = student['device'] == "초기화 필요";
+
+                    return Card(
+                      elevation: 2,
+                      margin: const EdgeInsets.only(bottom: 12),
+                      shape: RoundedRectangleBorder(
+                        borderRadius: BorderRadius.circular(16),
+                      ),
+                      child: ListTile(
+                        contentPadding: const EdgeInsets.symmetric(
+                          horizontal: 16,
+                          vertical: 12,
+                        ),
+                        leading: CircleAvatar(
+                          backgroundColor: needsReset
+                              ? Colors.red[50]
+                              : Colors.purple[50],
+                          child: Icon(
+                            needsReset ? Icons.lock_reset : Icons.person,
+                            color: needsReset ? Colors.red : Colors.purple,
+                          ),
+                        ),
+                        title: Text(
+                          '${student['name']} (${student['id']})',
+                          style: const TextStyle(
+                            fontWeight: FontWeight.bold,
+                            fontSize: 16,
+                          ),
+                        ),
+                        subtitle: Text(
+                          needsReset ? '기기 초기화 승인 대기중' : '정상 등록 상태',
+                          style: TextStyle(
+                            color: needsReset ? Colors.red : Colors.grey,
+                            fontWeight: needsReset
+                                ? FontWeight.bold
+                                : FontWeight.normal,
+                          ),
+                        ),
+                        // 🕹️ 오른쪽 끝에 [기기 리셋] 버튼과 [쓰레기통(삭제)] 버튼을 나란히 배치하는 Row 레이아웃 기획
+                        trailing: Row(
+                          mainAxisSize: MainAxisSize.min,
+                          children: [
+                            if (!needsReset)
+                              OutlinedButton(
+                                style: OutlinedButton.styleFrom(
+                                  foregroundColor: Colors.purple,
+                                  side: BorderSide(
+                                    color: Colors.purple.withValues(
+                                      alpha: 0.5,
+                                    ),
+                                  ),
+                                  shape: RoundedRectangleBorder(
+                                    borderRadius: BorderRadius.circular(8),
+                                  ),
+                                ),
+                                onPressed: () => _resetDevice(
+                                  student['id'],
+                                  student['name'],
+                                ),
+                                child: const Text('기기 리셋'),
+                              )
+                            else
+                              const Icon(
+                                Icons.check_circle,
+                                color: Colors.green,
+                              ),
+
+                            const SizedBox(width: 8),
+
+                            // 🔴 [새 버튼] 최고권한 마스터 전용 계정 영구 삭제 쓰레기통 버튼!
+                            IconButton(
+                              icon: const Icon(
+                                Icons.delete_forever_rounded,
+                                color: Colors.redAccent,
+                              ),
+                              tooltip: '계정 영구 삭제',
+                              onPressed: () =>
+                                  _deleteUser(student['id'], student['name']),
+                            ),
+                          ],
+                        ),
+                      ),
+                    );
+                  },
+                ),
+        );
+      },
+    );
+  }
+}
diff --git a/lib/screens/teacher_attendance_page.dart b/lib/ui/teacher_attendance_page.dart
similarity index 60%
rename from lib/screens/teacher_attendance_page.dart
rename to lib/ui/teacher_attendance_page.dart
index 359d8e1..06ae154 100644
--- a/lib/screens/teacher_attendance_page.dart
+++ b/lib/ui/teacher_attendance_page.dart
@@ -1,10 +1,7 @@
-// 📋 실시간 출석 현황 화면. 전체 학생 명단(/api/users)과 출석 로그(/api/logs)를
-// 합쳐서 출석/미출석 요약 카드 및 필터링된 목록을 3초마다 갱신해 보여준다.
-import 'dart:async';
-import 'dart:convert';
+// 📋 실시간 출석 현황 화면 (UI 전용). 위젯 빌드/레이아웃/스타일만 담당하고,
+// 서버 통신·상태·파생 로직은 lib/function/teacher_attendance_controller.dart가 담당한다.
 import 'package:flutter/material.dart';
-import 'package:http/http.dart' as http;
-import '../config.dart';
+import '../function/teacher_attendance_controller.dart';
 
 // -----------------------------------------------------------------------------
 // 📅 [서브 화면 1] 실시간 출석 확인 란 (StudentDashboard 카드 스타일 리스트화)
@@ -16,199 +13,36 @@ class TeacherAttendancePage extends StatefulWidget {
   State<TeacherAttendancePage> createState() => _TeacherAttendancePageState();
 }
 
-// 로그의 'name' 컬럼은 백엔드에서 "학생이름 (주머니정보)" 형태로 합쳐져 저장되어 있어서
-// 이름과 주머니 번호를 분리해서 보여주려면 클라이언트에서 파싱해야 한다.
-final RegExp _logNamePattern = RegExp(r'^(.*?)\s*\(([^)]*)\)$');
-
 class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
-  List<dynamic> _roster = []; // 전체 학생 명단 (/api/users)
-  List<dynamic> _logs = []; // 출석 로그 (/api/logs)
-  Map<String, dynamic> _activeViolationsByStudentId = {}; // 무단반출 중인 학생 (/api/violations/active)
-  String? _dismissedAt; // 오늘 가장 최근 하교 처리 시각 (/api/dismissal/latest). 이 시각 이후 기록만 "오늘 출석"으로 표시.
-  String? _attendanceTime; // 선생님이 지정한 자습실 출석시간 "HH:MM" (/api/settings/attendance-time). null이면 미설정.
-  String? _globalPermissionUntil; // 하교(12시간)/반출허용시간설정으로 전체 반출이 허용된 경우 그 만료 시각 (/api/permissions/status). null이면 비활성.
-  Timer? _timer;
-  bool _isLoading = true;
-  bool _isRefreshing = false; // 새로고침 버튼 클릭 시 잠깐 도는 표시용
-  String _filterType = "ALL"; // "ALL", "CHECKED_IN", "ABSENT"
+  final TeacherAttendanceController _controller = TeacherAttendanceController();
 
   @override
   void initState() {
     super.initState();
-    _fetchAll();
-    _timer = Timer.periodic(const Duration(seconds: 3), (timer) => _fetchAll());
+    _controller.init();
   }
 
   @override
   void dispose() {
-    _timer?.cancel();
+    _controller.dispose();
     super.dispose();
   }
 
-  Future<void> _manualRefresh() async {
-    setState(() => _isRefreshing = true);
-    await _fetchAll();
-    if (mounted) setState(() => _isRefreshing = false);
-  }
-
-  Future<void> _fetchAll() async {
-    try {
-      final results = await Future.wait([
-        http.get(Uri.parse('$baseUrl/api/users')),
-        http.get(Uri.parse('$baseUrl/api/logs')),
-        http.get(Uri.parse('$baseUrl/api/violations/active')),
-        http.get(Uri.parse('$baseUrl/api/dismissal/latest')),
-        http.get(Uri.parse('$baseUrl/api/settings/attendance-time')),
-        http.get(Uri.parse('$baseUrl/api/permissions/status')),
-      ]);
-
-      final usersRes = results[0];
-      final logsRes = results[1];
-      final violationsRes = results[2];
-      final dismissalRes = results[3];
-      final attendanceTimeRes = results[4];
-      final permissionStatusRes = results[5];
-
-      if (usersRes.statusCode == 200 && logsRes.statusCode == 200) {
-        final usersData = jsonDecode(utf8.decode(usersRes.bodyBytes));
-        final logsData = jsonDecode(utf8.decode(logsRes.bodyBytes));
-
-        Map<String, dynamic> activeViolations = {};
-        if (violationsRes.statusCode == 200) {
-          final violationsData = jsonDecode(utf8.decode(violationsRes.bodyBytes));
-          for (final v in (violationsData['violations'] ?? [])) {
-            activeViolations[v['student_id'].toString()] = v;
-          }
-        }
-
-        String? dismissedAt;
-        if (dismissalRes.statusCode == 200) {
-          final dismissalData = jsonDecode(utf8.decode(dismissalRes.bodyBytes));
-          dismissedAt = dismissalData['dismissedAt'];
-        }
-
-        String? attendanceTime;
-        if (attendanceTimeRes.statusCode == 200) {
-          final attendanceTimeData =
-              jsonDecode(utf8.decode(attendanceTimeRes.bodyBytes));
-          attendanceTime = attendanceTimeData['attendanceTime'];
-        }
-
-        String? globalPermissionUntil;
-        if (permissionStatusRes.statusCode == 200) {
-          final permissionStatusData =
-              jsonDecode(utf8.decode(permissionStatusRes.bodyBytes));
-          if (permissionStatusData['active'] == true) {
-            globalPermissionUntil = permissionStatusData['permittedUntil'];
-          }
-        }
-
-        setState(() {
-          _roster = usersData['users'] ?? [];
-          _logs = logsData['logs'] ?? [];
-          _activeViolationsByStudentId = activeViolations;
-          _dismissedAt = dismissedAt;
-          _attendanceTime = attendanceTime;
-          _globalPermissionUntil = globalPermissionUntil;
-          _isLoading = false;
-        });
-      } else {
-        setState(() => _isLoading = false);
-      }
-    } catch (e) {
-      setState(() => _isLoading = false);
-    }
-  }
-
-  /// 🏫 하교 처리: 전체 반출 허용 + 오늘 출석 표시 기준선을 지금 시각으로 옮긴다.
-  Future<void> _dismissAll() async {
-    try {
-      final response = await http.post(Uri.parse('$baseUrl/api/dismiss'));
-      final result = jsonDecode(utf8.decode(response.bodyBytes));
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(result['message'] ?? '하교 처리되었습니다.')),
-      );
-      _fetchAll();
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('❌ 하교 처리 실패: $e')),
-      );
-    }
-  }
-
-  /// 🚨 선생님이 특정 학생에게 지금부터 N분간 반출을 허용한다.
-  Future<void> _allowRemoval(String studentId, int minutes) async {
-    try {
-      final response = await http.post(
-        Uri.parse('$baseUrl/api/violations/allow'),
-        headers: {"Content-Type": "application/json"},
-        body: jsonEncode({"studentId": studentId, "minutes": minutes}),
-      );
-      final result = jsonDecode(utf8.decode(response.bodyBytes));
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(result['message'] ?? '처리되었습니다.')),
-      );
-      _fetchAll();
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('❌ 반출 허용 실패: $e')),
-      );
-    }
-  }
-
-  /// ⏰ 지금부터 N분간 전체 학생의 반출을 자동으로 허용한다 (쉬는시간 등).
-  Future<void> _setPermissionWindow(int minutes) async {
-    try {
-      final response = await http.post(
-        Uri.parse('$baseUrl/api/permissions/window'),
-        headers: {"Content-Type": "application/json"},
-        body: jsonEncode({"minutes": minutes}),
-      );
-      final result = jsonDecode(utf8.decode(response.bodyBytes));
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(result['message'] ?? '처리되었습니다.')),
-      );
-      _fetchAll();
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('❌ 설정 실패: $e')),
-      );
-    }
-  }
-
-  /// ⏰ 자습실 출석시간(기준 시각)을 지정한다. 이 시각 이후 태깅한 학생만 "출석 완료"로 강조 표시된다.
-  Future<void> _setAttendanceTime(String time) async {
-    try {
-      final response = await http.post(
-        Uri.parse('$baseUrl/api/settings/attendance-time'),
-        headers: {"Content-Type": "application/json"},
-        body: jsonEncode({"time": time}),
-      );
-      final result = jsonDecode(utf8.decode(response.bodyBytes));
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(result['message'] ?? '처리되었습니다.')),
-      );
-      _fetchAll();
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('❌ 출석시간 설정 실패: $e')),
-      );
-    }
+  /// 컨트롤러 액션을 실행하고, 결과 메시지를 스낵바로 보여준다.
+  Future<void> _runAction(Future<String> Function() action) async {
+    final message = await action();
+    if (!mounted) return;
+    ScaffoldMessenger.of(
+      context,
+    ).showSnackBar(SnackBar(content: Text(message)));
   }
 
   Future<void> _showAttendanceTimeDialog() async {
-    final TimeOfDay initial = _attendanceTime != null
+    final String? current = _controller.attendanceTime;
+    final TimeOfDay initial = current != null
         ? TimeOfDay(
-            hour: int.parse(_attendanceTime!.split(':')[0]),
-            minute: int.parse(_attendanceTime!.split(':')[1]),
+            hour: int.parse(current.split(':')[0]),
+            minute: int.parse(current.split(':')[1]),
           )
         : const TimeOfDay(hour: 19, minute: 0);
 
@@ -221,25 +55,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
 
     final String formatted =
         '${picked.hour.toString().padLeft(2, '0')}:${picked.minute.toString().padLeft(2, '0')}';
-    _setAttendanceTime(formatted);
-  }
-
-  /// 🧪 테스트용: 하교(12시간)/반출 허용 시간 설정 등으로 켜져 있는 허용 시간대를 즉시 해제한다.
-  Future<void> _resetTestPermissions() async {
-    try {
-      final response = await http.post(Uri.parse('$baseUrl/api/debug/reset-permissions'));
-      final result = jsonDecode(utf8.decode(response.bodyBytes));
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(result['message'] ?? '처리되었습니다.')),
-      );
-      _fetchAll();
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('❌ 초기화 실패: $e')),
-      );
-    }
+    await _runAction(() => _controller.setAttendanceTime(formatted));
   }
 
   void _showTestResetConfirmDialog() {
@@ -259,7 +75,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
           ElevatedButton(
             onPressed: () {
               Navigator.pop(context);
-              _resetTestPermissions();
+              _runAction(() => _controller.resetTestPermissions());
             },
             style: ElevatedButton.styleFrom(
               backgroundColor: Colors.grey[700],
@@ -295,7 +111,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
             onPressed: () {
               final minutes = int.tryParse(controller.text.trim()) ?? 5;
               Navigator.pop(context);
-              _allowRemoval(studentId, minutes);
+              _runAction(() => _controller.allowRemoval(studentId, minutes));
             },
             child: const Text('허용하기'),
           ),
@@ -338,7 +154,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
             onPressed: () {
               final minutes = int.tryParse(controller.text.trim()) ?? 10;
               Navigator.pop(context);
-              _setPermissionWindow(minutes);
+              _runAction(() => _controller.setPermissionWindow(minutes));
             },
             child: const Text('설정하기'),
           ),
@@ -364,7 +180,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
           ElevatedButton(
             onPressed: () {
               Navigator.pop(context);
-              _dismissAll();
+              _runAction(() => _controller.dismissAll());
             },
             child: const Text('하교 처리'),
           ),
@@ -373,170 +189,99 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
     );
   }
 
-  /// "오늘 출석"의 기준선. 하교 처리를 했다면 그 시각 이후, 안 했다면 오늘 자정부터.
-  Map<String, Map<String, String>> get _todaysCheckInsByStudentId {
-    // "YYYY-MM-DD HH:MM:SS" 형태의 문자열끼리는 그대로 비교해도 시간 순서가 맞는다.
-    final String cutoff =
-        _dismissedAt ??
-        '${DateTime.now().toIso8601String().substring(0, 10)} 00:00:00';
-    final Map<String, Map<String, String>> result = {};
-
-    for (final log in _logs) {
-      final String time = log['time']?.toString() ?? '';
-      if (time.isEmpty || time.compareTo(cutoff) <= 0) {
-        continue; // 하교 처리 시각(또는 오늘 자정) 이전 기록이면 무시
-      }
-
-      final String studentId = log['student_id']?.toString() ?? '';
-      if (studentId.isEmpty) continue;
-
-      // 이미 더 최신 기록을 찾았다면(로그는 최신순 정렬) 건너뛴다.
-      if (result.containsKey(studentId)) continue;
-
-      final String rawName = log['name']?.toString() ?? '';
-      final match = _logNamePattern.firstMatch(rawName);
-      result[studentId] = {
-        'name': match != null ? match.group(1)! : rawName,
-        'pocketNumber': match != null ? match.group(2)! : '주머니 미지정',
-        'time': time,
-      };
-    }
-    return result;
-  }
-
-  /// 지금까지(오늘 이전 포함) 단 한 번이라도 태깅한 적 있는 학생 학번 집합.
-  /// (오늘 미제출인 학생 중에서도 "한 번도 태깅 안 해본 애"를 구분하기 위함)
-  Set<String> get _everCheckedInStudentIds {
-    final Set<String> ids = {};
-    for (final log in _logs) {
-      final String studentId = log['student_id']?.toString() ?? '';
-      if (studentId.isNotEmpty) ids.add(studentId);
-    }
-    return ids;
-  }
-
-  /// ⏰ 태깅 시간과 지정된 자습실 출석시간을 비교해 'NONE' / 'PENDING' / 'COMPLETE'를 반환한다.
-  /// - NONE: 아직 태깅 안 함
-  /// - PENDING: 태깅은 했지만 지정된 출석시간 이전이라 아직 "출석 완료"로 안 침
-  /// - COMPLETE: 출석시간 미지정이거나, 지정된 출석시간 이후에 태깅함
-  String _computeAttendanceStatus(String? checkInTime) {
-    if (checkInTime == null) return 'NONE';
-    if (_attendanceTime == null) return 'COMPLETE';
-
-    final String todayStr = DateTime.now().toIso8601String().substring(0, 10);
-    final String cutoff = '$todayStr $_attendanceTime:00';
-    return checkInTime.compareTo(cutoff) >= 0 ? 'COMPLETE' : 'PENDING';
-  }
-
-  List<Map<String, dynamic>> get _combinedStudentStatus {
-    final checkIns = _todaysCheckInsByStudentId;
-    final everCheckedIn = _everCheckedInStudentIds;
-    return _roster.map((u) {
-      final String id = u['id']?.toString() ?? '';
-      final checkIn = checkIns[id];
-      final violation = _activeViolationsByStudentId[id];
-      final String attendanceStatus = _computeAttendanceStatus(checkIn?['time']);
-      return {
-        'studentId': id,
-        'studentName': u['name']?.toString() ?? '',
-        'isCheckedIn': checkIn != null,
-        'pocketNumber': checkIn?['pocketNumber'],
-        'checkInTime': checkIn?['time'],
-        'attendanceStatus': attendanceStatus,
-        'isAttendanceComplete': attendanceStatus == 'COMPLETE',
-        'hasEverCheckedIn': everCheckedIn.contains(id),
-        'hasActiveViolation': violation != null,
-        'violationPocket': violation?['pocket_number'],
-        'violationTime': violation?['time'],
-      };
-    }).toList();
-  }
-
-  List<Map<String, dynamic>> get _filteredStudents {
-    final all = _combinedStudentStatus;
-    if (_filterType == "CHECKED_IN") {
-      return all.where((s) => s['isAttendanceComplete'] == true).toList();
-    } else if (_filterType == "ABSENT") {
-      return all.where((s) => s['isAttendanceComplete'] == false).toList();
-    }
-    return all;
-  }
-
   @override
   Widget build(BuildContext context) {
-    final all = _combinedStudentStatus;
-    final int totalCount = all.length;
-    final int checkedInCount =
-        all.where((s) => s['isAttendanceComplete'] == true).length;
-    final int absentCount = totalCount - checkedInCount;
+    return ListenableBuilder(
+      listenable: _controller,
+      builder: (context, _) {
+        final all = _controller.combinedStudentStatus;
+        final int totalCount = all.length;
+        final int checkedInCount = all
+            .where((s) => s['isAttendanceComplete'] == true)
+            .length;
+        final int absentCount = totalCount - checkedInCount;
 
-    return Scaffold(
-      backgroundColor: Colors.grey[100],
-      appBar: AppBar(
-        title: const Text(
-          '📋 실시간 출석 현황',
-          style: TextStyle(fontWeight: FontWeight.bold),
-        ),
-        backgroundColor: Colors.blue,
-        foregroundColor: Colors.white,
-        elevation: 0,
-        actions: [
-          IconButton(
-            onPressed: (_isLoading || _isRefreshing) ? null : _manualRefresh,
-            icon: _isRefreshing
-                ? const SizedBox(
-                    width: 20,
-                    height: 20,
-                    child: CircularProgressIndicator(
-                      strokeWidth: 2,
-                      color: Colors.white,
-                    ),
-                  )
-                : const Icon(Icons.refresh_rounded),
-            tooltip: '새로고침',
-          ),
-          TextButton.icon(
-            onPressed: _showAttendanceTimeDialog,
-            icon: const Icon(Icons.access_time_rounded, color: Colors.white),
-            label: Text(
-              _attendanceTime != null ? '출석시간 $_attendanceTime' : '자습실 출석시간 설정',
-              style: const TextStyle(color: Colors.white),
+        return Scaffold(
+          backgroundColor: Colors.grey[100],
+          appBar: AppBar(
+            title: const Text(
+              '📋 실시간 출석 현황',
+              style: TextStyle(fontWeight: FontWeight.bold),
             ),
+            backgroundColor: Colors.blue,
+            foregroundColor: Colors.white,
+            elevation: 0,
+            actions: [
+              IconButton(
+                onPressed: (_controller.isLoading || _controller.isRefreshing)
+                    ? null
+                    : _controller.manualRefresh,
+                icon: _controller.isRefreshing
+                    ? const SizedBox(
+                        width: 20,
+                        height: 20,
+                        child: CircularProgressIndicator(
+                          strokeWidth: 2,
+                          color: Colors.white,
+                        ),
+                      )
+                    : const Icon(Icons.refresh_rounded),
+                tooltip: '새로고침',
+              ),
+              TextButton.icon(
+                onPressed: _showAttendanceTimeDialog,
+                icon: const Icon(Icons.access_time_rounded, color: Colors.white),
+                label: Text(
+                  _controller.attendanceTime != null
+                      ? '출석시간 ${_controller.attendanceTime}'
+                      : '자습실 출석시간 설정',
+                  style: const TextStyle(color: Colors.white),
+                ),
+              ),
+              TextButton.icon(
+                onPressed: _showPermissionWindowDialog,
+                icon: const Icon(Icons.timer_outlined, color: Colors.white),
+                label: const Text(
+                  '반출 허용 시간 설정',
+                  style: TextStyle(color: Colors.white),
+                ),
+              ),
+              TextButton.icon(
+                onPressed: _showDismissalConfirmDialog,
+                icon: const Icon(Icons.school_rounded, color: Colors.white),
+                label: const Text('하교', style: TextStyle(color: Colors.white)),
+              ),
+              IconButton(
+                onPressed: _showTestResetConfirmDialog,
+                icon: const Icon(
+                  Icons.bug_report_outlined,
+                  color: Colors.white70,
+                ),
+                tooltip: '🧪 테스트용: 허용시간 초기화',
+              ),
+              const SizedBox(width: 8),
+            ],
           ),
-          TextButton.icon(
-            onPressed: _showPermissionWindowDialog,
-            icon: const Icon(Icons.timer_outlined, color: Colors.white),
-            label: const Text(
-              '반출 허용 시간 설정',
-              style: TextStyle(color: Colors.white),
-            ),
-          ),
-          TextButton.icon(
-            onPressed: _showDismissalConfirmDialog,
-            icon: const Icon(Icons.school_rounded, color: Colors.white),
-            label: const Text(
-              '하교',
-              style: TextStyle(color: Colors.white),
-            ),
-          ),
-          IconButton(
-            onPressed: _showTestResetConfirmDialog,
-            icon: const Icon(Icons.bug_report_outlined, color: Colors.white70),
-            tooltip: '🧪 테스트용: 허용시간 초기화',
-          ),
-          const SizedBox(width: 8),
-        ],
-      ),
-      body: _isLoading
-          ? const Center(child: CircularProgressIndicator())
-          : LayoutBuilder(
-              builder: (context, constraints) {
-                final bool isWide = constraints.maxWidth >= 800;
-                return isWide
-                    ? _buildDesktopBody(totalCount, checkedInCount, absentCount)
-                    : _buildMobileBody(totalCount, checkedInCount, absentCount);
-              },
-            ),
+          body: _controller.isLoading
+              ? const Center(child: CircularProgressIndicator())
+              : LayoutBuilder(
+                  builder: (context, constraints) {
+                    final bool isWide = constraints.maxWidth >= 800;
+                    return isWide
+                        ? _buildDesktopBody(
+                            totalCount,
+                            checkedInCount,
+                            absentCount,
+                          )
+                        : _buildMobileBody(
+                            totalCount,
+                            checkedInCount,
+                            absentCount,
+                          );
+                  },
+                ),
+        );
+      },
     );
   }
 
@@ -544,13 +289,14 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
   // 📱 모바일 레이아웃 (기존 카드 리스트)
   // -----------------------------------------------------------------------
   Widget _buildMobileBody(int total, int checkedIn, int absent) {
+    final filteredStudents = _controller.filteredStudents;
     return Column(
       children: [
         _buildSummaryCards(total, checkedIn, absent),
         _buildPermissionBanner(),
         _buildFilterChips(),
         Expanded(
-          child: _filteredStudents.isEmpty
+          child: filteredStudents.isEmpty
               ? const Center(
                   child: Text(
                     '해당하는 학생이 없습니다.',
@@ -559,14 +305,18 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
                 )
               : ListView.builder(
                   padding: const EdgeInsets.symmetric(vertical: 12),
-                  itemCount: _filteredStudents.length,
+                  itemCount: filteredStudents.length,
                   itemBuilder: (context, index) {
-                    final student = _filteredStudents[index];
+                    final student = filteredStudents[index];
                     final bool isCheckedIn = student['isCheckedIn'];
-                    final bool hasViolation = student['hasActiveViolation'] == true;
-                    final bool isPending = student['attendanceStatus'] == 'PENDING';
-                    final bool isComplete = student['attendanceStatus'] == 'COMPLETE';
-                    final bool emphasizeTime = isComplete && _attendanceTime != null;
+                    final bool hasViolation =
+                        student['hasActiveViolation'] == true;
+                    final bool isPending =
+                        student['attendanceStatus'] == 'PENDING';
+                    final bool isComplete =
+                        student['attendanceStatus'] == 'COMPLETE';
+                    final bool emphasizeTime =
+                        isComplete && _controller.attendanceTime != null;
                     final Color statusColor = hasViolation
                         ? Colors.red
                         : (isPending
@@ -635,17 +385,18 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
                                               ? '학번: ${student['studentId']} | ⏳ 출석 미완료 (제출: ${student['checkInTime']})'
                                               : (isComplete
                                                   ? '학번: ${student['studentId']} | 제출시간: ${student['checkInTime']}'
-                                                  : (student['hasEverCheckedIn'] == true
-                                                      ? '학번: ${student['studentId']} | 미제출'
-                                                      : '학번: ${student['studentId']} | 미등록'))),
+                                                  : (student['hasEverCheckedIn'] ==
+                                                            true
+                                                        ? '학번: ${student['studentId']} | 미제출'
+                                                        : '학번: ${student['studentId']} | 미등록'))),
                                       style: TextStyle(
                                         color: hasViolation
                                             ? Colors.red[700]
                                             : (isPending
-                                                ? Colors.orange[800]
-                                                : (isComplete
-                                                    ? Colors.grey[600]
-                                                    : Colors.red[400])),
+                                                  ? Colors.orange[800]
+                                                  : (isComplete
+                                                        ? Colors.grey[600]
+                                                        : Colors.red[400])),
                                         fontSize: emphasizeTime ? 14 : 12,
                                         fontWeight: (hasViolation || emphasizeTime)
                                             ? FontWeight.bold
@@ -664,8 +415,9 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
                                   decoration: BoxDecoration(
                                     color: Colors.blue.shade50,
                                     borderRadius: BorderRadius.circular(20),
-                                    border:
-                                        Border.all(color: Colors.blue.shade200),
+                                    border: Border.all(
+                                      color: Colors.blue.shade200,
+                                    ),
                                   ),
                                   child: Text(
                                     student['pocketNumber'],
@@ -711,6 +463,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
   // 🖥️ 데스크톱 레이아웃 (선생님이 교실 컴퓨터 브라우저로 접속했을 때)
   // -----------------------------------------------------------------------
   Widget _buildDesktopBody(int total, int checkedIn, int absent) {
+    final filteredStudents = _controller.filteredStudents;
     return Center(
       child: ConstrainedBox(
         constraints: const BoxConstraints(maxWidth: 1100),
@@ -767,7 +520,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
                       ),
                     ],
                   ),
-                  child: _filteredStudents.isEmpty
+                  child: filteredStudents.isEmpty
                       ? const Center(
                           child: Text(
                             '해당하는 학생이 없습니다.',
@@ -787,7 +540,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
                               DataColumn(label: Text('주머니 번호')),
                               DataColumn(label: Text('작업')),
                             ],
-                            rows: _filteredStudents.map((student) {
+                            rows: filteredStudents.map((student) {
                               final bool isCheckedIn = student['isCheckedIn'];
                               final bool hasViolation =
                                   student['hasActiveViolation'] == true;
@@ -796,7 +549,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
                               final bool isComplete =
                                   student['attendanceStatus'] == 'COMPLETE';
                               final bool emphasizeTime =
-                                  isComplete && _attendanceTime != null;
+                                  isComplete && _controller.attendanceTime != null;
                               final Color statusColor = hasViolation
                                   ? Colors.red
                                   : (isPending
@@ -806,8 +559,10 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
                                 color: hasViolation
                                     ? WidgetStateProperty.all(Colors.red[50])
                                     : (isPending
-                                        ? WidgetStateProperty.all(Colors.orange[50])
-                                        : null),
+                                          ? WidgetStateProperty.all(
+                                              Colors.orange[50],
+                                            )
+                                          : null),
                                 cells: [
                                   DataCell(
                                     Icon(
@@ -839,17 +594,18 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
                                               ? '⏳ 출석 미완료 (제출: ${student['checkInTime']})'
                                               : (isComplete
                                                   ? '${student['checkInTime']}'
-                                                  : (student['hasEverCheckedIn'] == true
-                                                      ? '미제출'
-                                                      : '미등록'))),
+                                                  : (student['hasEverCheckedIn'] ==
+                                                            true
+                                                        ? '미제출'
+                                                        : '미등록'))),
                                       style: TextStyle(
                                         color: hasViolation
                                             ? Colors.red[700]
                                             : (isPending
-                                                ? Colors.orange[800]
-                                                : (isComplete
-                                                    ? Colors.grey[700]
-                                                    : Colors.red[400])),
+                                                  ? Colors.orange[800]
+                                                  : (isComplete
+                                                        ? Colors.grey[700]
+                                                        : Colors.red[400])),
                                         fontSize: emphasizeTime ? 15 : 14,
                                         fontWeight: (hasViolation || emphasizeTime)
                                             ? FontWeight.bold
@@ -900,8 +656,8 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
                                               foregroundColor: Colors.white,
                                               padding:
                                                   const EdgeInsets.symmetric(
-                                                horizontal: 12,
-                                              ),
+                                                    horizontal: 12,
+                                                  ),
                                             ),
                                           )
                                         : const Text('-'),
@@ -1002,11 +758,11 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
     );
   }
 
-  /// 🔘 필터 칩버튼 (전체 / 출석자 / 미출석자)
   /// 🔓 하교(12시간)/반출 허용 시간 설정으로 지금 전체 반출이 허용 중이면 눈에 띄게 배너로 알려준다.
   /// (허용 중일 땐 무단반출을 감지해도 대시보드에 뜨지 않기 때문에, 왜 안 뜨는지 헷갈리지 않게 하기 위함)
   Widget _buildPermissionBanner() {
-    if (_globalPermissionUntil == null) return const SizedBox.shrink();
+    final String? until = _controller.globalPermissionUntil;
+    if (until == null) return const SizedBox.shrink();
 
     return Container(
       width: double.infinity,
@@ -1023,7 +779,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
           const SizedBox(width: 8),
           Expanded(
             child: Text(
-              '🔓 지금 전체 반출 허용 중입니다 ($_globalPermissionUntil 까지) — 이 시간 동안은 무단반출 경고가 뜨지 않아요.',
+              '🔓 지금 전체 반출 허용 중입니다 ($until 까지) — 이 시간 동안은 무단반출 경고가 뜨지 않아요.',
               style: TextStyle(
                 color: Colors.amber[900],
                 fontWeight: FontWeight.bold,
@@ -1036,6 +792,7 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
     );
   }
 
+  /// 🔘 필터 칩버튼 (전체 / 출석자 / 미출석자)
   Widget _buildFilterChips() {
     return Padding(
       padding: const EdgeInsets.symmetric(vertical: 8, horizontal: 16),
@@ -1043,20 +800,20 @@ class _TeacherAttendancePageState extends State<TeacherAttendancePage> {
         children: [
           FilterChip(
             label: const Text("전체"),
-            selected: _filterType == "ALL",
-            onSelected: (_) => setState(() => _filterType = "ALL"),
+            selected: _controller.filterType == "ALL",
+            onSelected: (_) => _controller.setFilter("ALL"),
           ),
           const SizedBox(width: 8),
           FilterChip(
             label: const Text("🟢 출석자"),
-            selected: _filterType == "CHECKED_IN",
-            onSelected: (_) => setState(() => _filterType = "CHECKED_IN"),
+            selected: _controller.filterType == "CHECKED_IN",
+            onSelected: (_) => _controller.setFilter("CHECKED_IN"),
           ),
           const SizedBox(width: 8),
           FilterChip(
             label: const Text("🔴 미출석자"),
-            selected: _filterType == "ABSENT",
-            onSelected: (_) => setState(() => _filterType = "ABSENT"),
+            selected: _controller.filterType == "ABSENT",
+            onSelected: (_) => _controller.setFilter("ABSENT"),
           ),
         ],
       ),
diff --git a/lib/screens/teacher_dashboard.dart b/lib/ui/teacher_dashboard.dart
similarity index 100%
rename from lib/screens/teacher_dashboard.dart
rename to lib/ui/teacher_dashboard.dart
diff --git a/lib/ui/teacher_register_screen.dart b/lib/ui/teacher_register_screen.dart
new file mode 100644
index 0000000..f66a649
--- /dev/null
+++ b/lib/ui/teacher_register_screen.dart
@@ -0,0 +1,141 @@
+// 👨‍🏫 교사 회원가입 화면 (UI 전용). 서버 통신/상태는
+// lib/function/teacher_register_controller.dart가 담당한다.
+import 'package:flutter/material.dart';
+import '../function/teacher_register_controller.dart';
+
+class TeacherRegisterScreen extends StatefulWidget {
+  const TeacherRegisterScreen({super.key});
+
+  @override
+  State<TeacherRegisterScreen> createState() => _TeacherRegisterScreenState();
+}
+
+class _TeacherRegisterScreenState extends State<TeacherRegisterScreen> {
+  final TeacherRegisterController _controller = TeacherRegisterController();
+  final _idController = TextEditingController();
+  final _pwController = TextEditingController();
+  final _nameController = TextEditingController();
+  final _secretController = TextEditingController();
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    _idController.dispose();
+    _pwController.dispose();
+    _nameController.dispose();
+    _secretController.dispose();
+    super.dispose();
+  }
+
+  Future<void> _registerTeacher() async {
+    String id = _idController.text.trim();
+    String pw = _pwController.text.trim();
+    String name = _nameController.text.trim();
+    String secret = _secretController.text.trim();
+
+    if (id.isEmpty || pw.isEmpty || name.isEmpty || secret.isEmpty) {
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(const SnackBar(content: Text('⚠️ 모든 빈칸을 입력해 주세요.')));
+      return;
+    }
+
+    final (success, message) = await _controller.registerTeacher(
+      id: id,
+      password: pw,
+      name: name,
+      secretCode: secret,
+    );
+    if (!mounted) return;
+    ScaffoldMessenger.of(
+      context,
+    ).showSnackBar(SnackBar(content: Text(message)));
+    if (success) {
+      Navigator.pop(context); // 가입 성공 시 로그인 화면으로 복귀
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListenableBuilder(
+      listenable: _controller,
+      builder: (context, _) {
+        return Scaffold(
+          appBar: AppBar(
+            title: const Text('교사 회원가입'),
+            backgroundColor: Colors.indigo,
+            foregroundColor: Colors.white,
+          ),
+          body: SingleChildScrollView(
+            padding: const EdgeInsets.all(24.0),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                const Text(
+                  '👨‍🏫 교직원 전용 인증',
+                  style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
+                ),
+                const SizedBox(height: 4),
+                const Text(
+                  '학교에서 발급한 교사 가입 비밀코드가 필요합니다.',
+                  style: TextStyle(color: Colors.grey),
+                ),
+                const SizedBox(height: 24),
+                TextField(
+                  controller: _secretController,
+                  obscureText: true,
+                  decoration: const InputDecoration(
+                    labelText: '🔑 교사 인증 비밀코드 입력',
+                    border: OutlineInputBorder(),
+                  ),
+                ),
+                const SizedBox(height: 16),
+                const Divider(),
+                const SizedBox(height: 16),
+                TextField(
+                  controller: _idController,
+                  decoration: const InputDecoration(
+                    labelText: '교직원 번호 (ID로 사용)',
+                    border: OutlineInputBorder(),
+                  ),
+                ),
+                const SizedBox(height: 12),
+                TextField(
+                  controller: _nameController,
+                  decoration: const InputDecoration(
+                    labelText: '선생님 성함',
+                    border: OutlineInputBorder(),
+                  ),
+                ),
+                const SizedBox(height: 12),
+                TextField(
+                  controller: _pwController,
+                  obscureText: true,
+                  decoration: const InputDecoration(
+                    labelText: '사용할 비밀번호 입력',
+                    border: OutlineInputBorder(),
+                  ),
+                ),
+                const SizedBox(height: 24),
+                SizedBox(
+                  width: double.infinity,
+                  height: 50,
+                  child: ElevatedButton(
+                    style: ElevatedButton.styleFrom(
+                      backgroundColor: Colors.indigo,
+                      foregroundColor: Colors.white,
+                    ),
+                    onPressed: _controller.isLoading ? null : _registerTeacher,
+                    child: _controller.isLoading
+                        ? const CircularProgressIndicator(color: Colors.white)
+                        : const Text('교사 계정 생성하기'),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        );
+      },
+    );
+  }
+}
diff --git a/lib/ui/teacher_student_management_page.dart b/lib/ui/teacher_student_management_page.dart
new file mode 100644
index 0000000..1d91937
--- /dev/null
+++ b/lib/ui/teacher_student_management_page.dart
@@ -0,0 +1,348 @@
+// 👥 교사용 학생 계정 관리 화면 (UI 전용). 신규 학생 계정 추가 폼과 강제 삭제 다이얼로그를 그린다.
+// 서버 통신/상태는 lib/function/teacher_student_management_controller.dart가 담당한다.
+import 'package:flutter/material.dart';
+import '../function/teacher_student_management_controller.dart';
+
+// -----------------------------------------------------------------------------
+// 👥 [서브 화면 2] 학생 계정 관리 란 (추가 양식 폼 + 강제 삭제 다이얼로그 완전 내장)
+// -----------------------------------------------------------------------------
+class TeacherStudentManagementPage extends StatefulWidget {
+  const TeacherStudentManagementPage({super.key});
+
+  @override
+  State<TeacherStudentManagementPage> createState() =>
+      _TeacherStudentManagementPageState();
+}
+
+class _TeacherStudentManagementPageState
+    extends State<TeacherStudentManagementPage> {
+  final TeacherStudentManagementController _controller =
+      TeacherStudentManagementController();
+  final TextEditingController _addIdController = TextEditingController();
+  final TextEditingController _addNameController = TextEditingController();
+  final TextEditingController _addPwController = TextEditingController();
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    _addIdController.dispose();
+    _addNameController.dispose();
+    _addPwController.dispose();
+    super.dispose();
+  }
+
+  // ➕ [학생 추가 버튼 동작]
+  Future<void> _addStudentAccount() async {
+    final sId = _addIdController.text.trim();
+    final sName = _addNameController.text.trim();
+    final sPw = _addPwController.text.trim();
+
+    if (sId.isEmpty || sName.isEmpty || sPw.isEmpty) {
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(const SnackBar(content: Text('⚠️ 모든 입력란을 채워주세요.')));
+      return;
+    }
+
+    final (success, message) = await _controller.addStudentAccount(
+      studentId: sId,
+      name: sName,
+      password: sPw,
+    );
+    if (!mounted) return;
+    if (success) {
+      _addIdController.clear();
+      _addNameController.clear();
+      _addPwController.clear();
+    }
+    ScaffoldMessenger.of(
+      context,
+    ).showSnackBar(SnackBar(content: Text(message)));
+  }
+
+  // ❌ [학생 삭제 버튼 동작]
+  Future<void> _deleteStudentAccount(String studentId) async {
+    final (_, message) = await _controller.deleteStudentAccount(studentId);
+    if (!mounted) return;
+    ScaffoldMessenger.of(
+      context,
+    ).showSnackBar(SnackBar(content: Text(message)));
+  }
+
+  // 🚨 계정 삭제 확인 팝업창 모달
+  void _showDeleteDialog() {
+    final TextEditingController deleteIdController = TextEditingController();
+    showDialog(
+      context: context,
+      builder: (context) {
+        return AlertDialog(
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(24),
+          ),
+          title: Row(
+            children: [
+              Icon(Icons.warning_amber_rounded, color: Colors.orange[700]),
+              const SizedBox(width: 10),
+              const Text(
+                '학생 계정 강제 삭제',
+                style: TextStyle(fontWeight: FontWeight.bold, fontSize: 18),
+              ),
+            ],
+          ),
+          content: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              const Text(
+                '영구 삭제할 학생의 학번을 정확하게 입력하세요.',
+                style: TextStyle(color: Colors.black54, fontSize: 13),
+              ),
+              const SizedBox(height: 16),
+              TextField(
+                controller: deleteIdController,
+                keyboardType: TextInputType.number,
+                decoration: InputDecoration(
+                  labelText: '학번 입력',
+                  labelStyle: TextStyle(color: Colors.orange[700]),
+                  focusedBorder: OutlineInputBorder(
+                    borderRadius: BorderRadius.circular(16),
+                    borderSide: BorderSide(
+                      color: Colors.orange[700]!,
+                      width: 2,
+                    ),
+                  ),
+                  border: OutlineInputBorder(
+                    borderRadius: BorderRadius.circular(16),
+                  ),
+                  prefixIcon: const Icon(Icons.no_accounts_rounded),
+                ),
+              ),
+            ],
+          ),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(context),
+              child: const Text('취소', style: TextStyle(color: Colors.grey)),
+            ),
+            ElevatedButton(
+              onPressed: () {
+                final inputId = deleteIdController.text.trim();
+                if (inputId.isNotEmpty) {
+                  Navigator.pop(context);
+                  _deleteStudentAccount(inputId);
+                }
+              },
+              style: ElevatedButton.styleFrom(
+                backgroundColor: Colors.orange[700],
+                foregroundColor: Colors.white,
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(12),
+                ),
+              ),
+              child: const Text(
+                '삭제 확정',
+                style: TextStyle(fontWeight: FontWeight.bold),
+              ),
+            ),
+          ],
+        );
+      },
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListenableBuilder(
+      listenable: _controller,
+      builder: (context, _) {
+        return Scaffold(
+          backgroundColor: Colors.grey[100],
+          appBar: AppBar(
+            title: const Text(
+              '⚙️ 학생 통합 관리 센터',
+              style: TextStyle(fontWeight: FontWeight.bold),
+            ),
+            backgroundColor: Colors.orange,
+            foregroundColor: Colors.white,
+            elevation: 0,
+          ),
+          body: SingleChildScrollView(
+            padding: const EdgeInsets.all(24.0),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                // 🏷️ 인디케이터 바 1 (추가 메뉴)
+                Row(
+                  children: [
+                    Container(
+                      width: 4,
+                      height: 16,
+                      decoration: BoxDecoration(
+                        color: Colors.orange,
+                        borderRadius: BorderRadius.circular(2),
+                      ),
+                    ),
+                    const SizedBox(width: 8),
+                    const Text(
+                      '신규 학생 계정 추가',
+                      style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
+                    ),
+                  ],
+                ),
+                const SizedBox(height: 16),
+
+                // 📝 학생 추가 컨테이너 폼
+                Container(
+                  padding: const EdgeInsets.all(20),
+                  decoration: BoxDecoration(
+                    color: Colors.white,
+                    borderRadius: BorderRadius.circular(24),
+                    boxShadow: [
+                      BoxShadow(
+                        color: Colors.black.withValues(alpha: 0.04),
+                        blurRadius: 16,
+                      ),
+                    ],
+                  ),
+                  child: Column(
+                    children: [
+                      TextField(
+                        controller: _addIdController,
+                        keyboardType: TextInputType.number,
+                        decoration: const InputDecoration(
+                          labelText: '학번',
+                          prefixIcon: Icon(Icons.badge),
+                        ),
+                      ),
+                      const SizedBox(height: 12),
+                      TextField(
+                        controller: _addNameController,
+                        decoration: const InputDecoration(
+                          labelText: '이름',
+                          prefixIcon: Icon(Icons.person),
+                        ),
+                      ),
+                      const SizedBox(height: 12),
+                      TextField(
+                        controller: _addPwController,
+                        obscureText: true,
+                        decoration: const InputDecoration(
+                          labelText: '초기 비밀번호',
+                          prefixIcon: Icon(Icons.lock),
+                        ),
+                      ),
+                      const SizedBox(height: 20),
+                      SizedBox(
+                        width: double.infinity,
+                        height: 50,
+                        child: ElevatedButton(
+                          onPressed: _controller.isWorking
+                              ? null
+                              : _addStudentAccount,
+                          style: ElevatedButton.styleFrom(
+                            backgroundColor: Colors.orange,
+                            foregroundColor: Colors.white,
+                            shape: RoundedRectangleBorder(
+                              borderRadius: BorderRadius.circular(12),
+                            ),
+                          ),
+                          child: _controller.isWorking
+                              ? const CircularProgressIndicator(
+                                  color: Colors.white,
+                                )
+                              : const Text(
+                                  '학생 등록 완료',
+                                  style: TextStyle(
+                                    fontWeight: FontWeight.bold,
+                                    fontSize: 15,
+                                  ),
+                                ),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                const SizedBox(height: 36),
+
+                // 🏷️ 인디케이터 바 2 (삭제 권한 제어메뉴)
+                Row(
+                  children: [
+                    Container(
+                      width: 4,
+                      height: 16,
+                      decoration: BoxDecoration(
+                        color: Colors.red,
+                        borderRadius: BorderRadius.circular(2),
+                      ),
+                    ),
+                    const SizedBox(width: 8),
+                    const Text(
+                      '위험 구역 (Account Reset)',
+                      style: TextStyle(
+                        fontSize: 18,
+                        fontWeight: FontWeight.bold,
+                        color: Colors.redAccent,
+                      ),
+                    ),
+                  ],
+                ),
+                const SizedBox(height: 16),
+
+                // 🚨 학생 삭제 트리거 카드
+                InkWell(
+                  onTap: _showDeleteDialog,
+                  borderRadius: BorderRadius.circular(24),
+                  child: Container(
+                    padding: const EdgeInsets.all(20),
+                    decoration: BoxDecoration(
+                      color: Colors.red[50],
+                      borderRadius: BorderRadius.circular(24),
+                      border: Border.all(color: Colors.red.shade200),
+                    ),
+                    child: const Row(
+                      children: [
+                        Icon(
+                          Icons.delete_sweep_rounded,
+                          color: Colors.red,
+                          size: 32,
+                        ),
+                        SizedBox(width: 16),
+                        Expanded(
+                          child: Column(
+                            crossAxisAlignment: CrossAxisAlignment.start,
+                            children: [
+                              Text(
+                                '학생 계정 강제 원격 삭제',
+                                style: TextStyle(
+                                  fontSize: 16,
+                                  fontWeight: FontWeight.bold,
+                                  color: Colors.red,
+                                ),
+                              ),
+                              SizedBox(height: 2),
+                              Text(
+                                '인증 초기화 및 DB 제거용',
+                                style: TextStyle(
+                                  fontSize: 12,
+                                  color: Colors.redAccent,
+                                ),
+                              ),
+                            ],
+                          ),
+                        ),
+                        Icon(
+                          Icons.arrow_forward_ios_rounded,
+                          color: Colors.red,
+                          size: 16,
+                        ),
+                      ],
+                    ),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        );
+      },
+    );
+  }
+}