diff --git a/lib/pages/account/account_deactivate_logic.dart b/lib/pages/account/account_deactivate_logic.dart
new file mode 100644
index 0000000..bcb9d7e
--- /dev/null
+++ b/lib/pages/account/account_deactivate_logic.dart
@@ -0,0 +1,85 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+
+import '../../core/data/remote/api_client.dart';
+import '../../core/data/repositories/account_repository.dart';
+
+/// 注销申请与撤销状态。
+class AccountDeactivateLogic extends ChangeNotifier {
+  AccountDeactivateLogic(
+    this._repository, {
+    required this.clearSession,
+  });
+
+  static const maxReasonLength = 200;
+
+  final AccountRepository _repository;
+  final Future<void> Function() clearSession;
+  DateTime? scheduledAt;
+  bool requesting = false;
+  bool cancelling = false;
+  String? error;
+  String? actionMessage;
+  bool cancelSucceeded = false;
+  bool _disposed = false;
+
+  /// 申请注销；成功后立即清理本地会话。
+  Future<bool> request(String reason) async {
+    requesting = true;
+    error = null;
+    cancelSucceeded = false;
+    _notify();
+    try {
+      scheduledAt = await _repository.deactivate(
+        reason.trim().substring(
+          0,
+          reason.trim().length > maxReasonLength
+              ? maxReasonLength
+              : reason.trim().length,
+        ),
+      );
+      await clearSession();
+      return true;
+    } catch (failure) {
+      error = failure is ApiException
+          ? failure.message
+          : 'accountDeactivateFailed';
+      return false;
+    } finally {
+      requesting = false;
+      _notify();
+    }
+  }
+
+  /// 撤销待处理申请；失败时保留后端文案。
+  Future<bool> cancel() async {
+    cancelling = true;
+    actionMessage = null;
+    cancelSucceeded = false;
+    _notify();
+    try {
+      await _repository.cancelDeactivation();
+      cancelSucceeded = true;
+      return true;
+    } catch (failure) {
+      actionMessage = failure is ApiException
+          ? failure.message
+          : 'accountCancelFailed';
+      return false;
+    } finally {
+      cancelling = false;
+      _notify();
+    }
+  }
+
+  void _notify() {
+    if (!_disposed) notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
+}
diff --git a/lib/pages/account/account_devices_logic.dart b/lib/pages/account/account_devices_logic.dart
new file mode 100644
index 0000000..cbc1241
--- /dev/null
+++ b/lib/pages/account/account_devices_logic.dart
@@ -0,0 +1,45 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+
+import '../../core/data/models/account_device.dart';
+import '../../core/data/remote/api_client.dart';
+import '../../core/data/repositories/account_repository.dart';
+
+/// 只读登录设备列表状态。
+class AccountDevicesLogic extends ChangeNotifier {
+  AccountDevicesLogic(this._repository);
+
+  final AccountRepository _repository;
+  List<AccountDevice> devices = const [];
+  bool loading = false;
+  String? error;
+  bool _disposed = false;
+
+  /// 拉取当前账号的设备列表。
+  Future<void> load() async {
+    loading = true;
+    error = null;
+    _notify();
+    try {
+      devices = await _repository.devices();
+    } catch (failure) {
+      error = failure is ApiException
+          ? failure.message
+          : 'accountDevicesLoadFailed';
+    } finally {
+      loading = false;
+      _notify();
+    }
+  }
+
+  void _notify() {
+    if (!_disposed) notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
+}
diff --git a/lib/pages/account/account_export_logic.dart b/lib/pages/account/account_export_logic.dart
new file mode 100644
index 0000000..90546a0
--- /dev/null
+++ b/lib/pages/account/account_export_logic.dart
@@ -0,0 +1,54 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+
+import '../../core/data/models/account_export.dart';
+import '../../core/data/remote/api_client.dart';
+import '../../core/data/repositories/account_repository.dart';
+
+/// 账号数据导出状态与复制动作。
+class AccountExportLogic extends ChangeNotifier {
+  AccountExportLogic(this._repository, {required this.copyText});
+
+  final AccountRepository _repository;
+  final Future<void> Function(String text) copyText;
+  AccountExport? data;
+  bool loading = false;
+  String? error;
+  bool _disposed = false;
+
+  /// 加载完整导出数据。
+  Future<void> load() async {
+    loading = true;
+    error = null;
+    _notify();
+    try {
+      data = await _repository.export();
+    } catch (failure) {
+      error = failure is ApiException
+          ? failure.message
+          : 'accountExportLoadFailed';
+    } finally {
+      loading = false;
+      _notify();
+    }
+  }
+
+  /// 把后端下发的完整 JSON 写入剪贴板。
+  Future<bool> copy() async {
+    final current = data;
+    if (current == null) return false;
+    await copyText(current.rawJson);
+    return true;
+  }
+
+  void _notify() {
+    if (!_disposed) notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
+}
diff --git a/lib/pages/account/account_profile_logic.dart b/lib/pages/account/account_profile_logic.dart
new file mode 100644
index 0000000..84292cc
--- /dev/null
+++ b/lib/pages/account/account_profile_logic.dart
@@ -0,0 +1,91 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+
+import '../../core/data/models/account_profile.dart';
+import '../../core/data/remote/api_client.dart';
+import '../../core/data/repositories/account_repository.dart';
+
+/// 个人资料页状态与保存动作。
+class AccountProfileLogic extends ChangeNotifier {
+  AccountProfileLogic(this._repository, {required this.onProfileUpdated});
+
+  static const maxNicknameLength = 30;
+
+  final AccountRepository _repository;
+  final Future<void> Function(AccountProfile profile) onProfileUpdated;
+
+  AccountProfile? profile;
+  bool loading = false;
+  bool saving = false;
+  String? error;
+  String? fieldError;
+  bool _disposed = false;
+
+  /// 进入页面时加载当前资料。
+  Future<void> load() async {
+    loading = true;
+    error = null;
+    _notify();
+    try {
+      profile = await _repository.profile();
+    } catch (failure) {
+      error = _message(failure) ?? 'accountProfileLoadFailed';
+    } finally {
+      loading = false;
+      _notify();
+    }
+  }
+
+  /// 只提交本次改动；成功后同步登录态摘要。
+  Future<bool> save({
+    required String nickname,
+    required String gender,
+    String? birthday,
+  }) async {
+    final current = profile;
+    if (current == null) return false;
+    final trimmed = nickname.trim();
+    if (trimmed.isEmpty || trimmed.length > maxNicknameLength) {
+      fieldError = 'accountNicknameInvalid';
+      _notify();
+      return false;
+    }
+    final update = AccountProfileUpdate(
+      nickname: trimmed == current.nickname ? null : trimmed,
+      gender: gender.isEmpty || gender == current.gender ? null : gender,
+      birthday: birthday == null || birthday.isEmpty ? null : birthday,
+    );
+    if (update.toJson().isEmpty) return true;
+
+    saving = true;
+    error = null;
+    fieldError = null;
+    _notify();
+    try {
+      final next = await _repository.updateProfile(update);
+      profile = next;
+      await onProfileUpdated(next);
+      return true;
+    } catch (failure) {
+      error = _message(failure) ?? 'accountProfileSaveFailed';
+      return false;
+    } finally {
+      saving = false;
+      _notify();
+    }
+  }
+
+  String? _message(Object failure) =>
+      failure is ApiException ? failure.message : null;
+
+  void _notify() {
+    if (!_disposed) notifyListeners();
+  }
+
+  @override
+  void dispose() {
+    _disposed = true;
+    super.dispose();
+  }
+}
diff --git a/test/account/account_logic_test.dart b/test/account/account_logic_test.dart
new file mode 100644
index 0000000..47757a6
--- /dev/null
+++ b/test/account/account_logic_test.dart
@@ -0,0 +1,101 @@
+// Author: fruit.com.cn
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/data/models/account_device.dart';
+import 'package:fruitshorts/core/data/models/account_profile.dart';
+import 'package:fruitshorts/pages/account/account_deactivate_logic.dart';
+import 'package:fruitshorts/pages/account/account_devices_logic.dart';
+import 'package:fruitshorts/pages/account/account_export_logic.dart';
+import 'package:fruitshorts/pages/account/account_profile_logic.dart';
+
+import '../support/fake_account_repository.dart';
+
+void main() {
+  test('should_update_profile_and_notify_auth_when_saved', () async {
+    final repository = FakeAccountRepository();
+    AccountProfile? applied;
+    final logic = AccountProfileLogic(
+      repository,
+      onProfileUpdated: (profile) async => applied = profile,
+    );
+    await logic.load();
+
+    final ok = await logic.save(
+      nickname: '  Nadia Baru  ',
+      gender: 'unknown',
+      birthday: '1999-01-02',
+    );
+
+    expect(ok, isTrue);
+    expect(repository.lastUpdate?.nickname, 'Nadia Baru');
+    expect(repository.lastUpdate?.gender, 'unknown');
+    expect(repository.lastUpdate?.birthday, '1999-01-02');
+    expect(applied?.nickname, 'Nadia Baru');
+  });
+
+  test('should_load_devices_and_keep_the_page_read_only', () async {
+    final repository = FakeAccountRepository(
+      devices: const [
+        AccountDevice(
+          id: '1',
+          deviceId: 'd-device-1234',
+          platform: 'IOS',
+          deviceModel: 'iPhone 15',
+          status: 'active',
+        ),
+      ],
+    );
+    final logic = AccountDevicesLogic(repository);
+
+    await logic.load();
+
+    expect(logic.devices.single.deviceModel, 'iPhone 15');
+    expect(logic.loading, isFalse);
+    expect(logic.error, isNull);
+  });
+
+  test('should_copy_complete_export_json_when_requested', () async {
+    final repository = FakeAccountRepository();
+    String copied = '';
+    final logic = AccountExportLogic(
+      repository,
+      copyText: (value) async => copied = value,
+    );
+    await logic.load();
+
+    final ok = await logic.copy();
+
+    expect(ok, isTrue);
+    expect(copied, contains('"credentials"'));
+    expect(copied, contains('n***@example.com'));
+  });
+
+  test('should_clear_session_and_keep_schedule_when_deactivation_succeeds', () async {
+    final repository = FakeAccountRepository();
+    var cleared = false;
+    final logic = AccountDeactivateLogic(
+      repository,
+      clearSession: () async => cleared = true,
+    );
+
+    final ok = await logic.request('不再使用');
+
+    expect(ok, isTrue);
+    expect(repository.lastDeactivateReason, '不再使用');
+    expect(logic.scheduledAt, DateTime(2026, 11, 3, 9, 30));
+    expect(cleared, isTrue);
+  });
+
+  test('should_show_backend_message_when_cancel_deactivation_fails', () async {
+    final repository = FakeAccountRepository()..failCancel = true;
+    final logic = AccountDeactivateLogic(
+      repository,
+      clearSession: () async {},
+    );
+
+    final ok = await logic.cancel();
+
+    expect(ok, isFalse);
+    expect(logic.actionMessage, '没有待处理的注销申请');
+  });
+}
diff --git a/test/support/fake_account_repository.dart b/test/support/fake_account_repository.dart
new file mode 100644
index 0000000..d23f6e6
--- /dev/null
+++ b/test/support/fake_account_repository.dart
@@ -0,0 +1,127 @@
+// Author: fruit.com.cn
+
+import 'package:fruitshorts/core/data/models/account_device.dart';
+import 'package:fruitshorts/core/data/models/account_export.dart';
+import 'package:fruitshorts/core/data/models/account_profile.dart';
+import 'package:fruitshorts/core/data/repositories/account_repository.dart';
+import 'package:fruitshorts/core/data/remote/api_client.dart';
+
+/// 账号中心测试替身；可预置数据与失败文案。
+class FakeAccountRepository implements AccountRepository {
+  FakeAccountRepository({
+    AccountProfile? profile,
+    List<AccountDevice> devices = const [],
+    AccountExport? export,
+  }) : _profile = profile ?? defaultProfile,
+       _devices = [...devices],
+       _export = export ?? defaultExport;
+
+  static const defaultProfile = AccountProfile(
+    uid: 'U-K19',
+    nickname: 'Nadia',
+    avatarUrl: '',
+    gender: 'female',
+    countryCode: 'ID',
+    regionCode: 'JK',
+    language: 'id',
+    timezone: 'Asia/Jakarta',
+    currency: 'IDR',
+    status: 'normal',
+    maskedTarget: 'n***@example.com',
+    vipLevel: 0,
+  );
+
+  static const defaultExport = AccountExport(
+    profile: defaultProfile,
+    credentials: [
+      AccountCredential(
+        type: 'EMAIL',
+        masked: 'n***@example.com',
+        verified: true,
+      ),
+    ],
+    consentCount: 1,
+    devices: [],
+    raw: {
+      'profile': {'uid': 'U-K19', 'nickname': 'Nadia'},
+      'credentials': [
+        {'type': 'EMAIL', 'masked': 'n***@example.com', 'verified': true},
+      ],
+      'consents': [
+        {'scene': 'privacy'},
+      ],
+      'devices': [],
+    },
+  );
+
+  AccountProfile _profile;
+  List<AccountDevice> _devices;
+  AccountExport _export;
+  AccountProfileUpdate? lastUpdate;
+  String? lastDeactivateReason;
+  int profileCalls = 0;
+  int deviceCalls = 0;
+  int exportCalls = 0;
+  bool failProfile = false;
+  bool failDevices = false;
+  bool failExport = false;
+  bool failUpdate = false;
+  bool failDeactivate = false;
+  bool failCancel = false;
+
+  @override
+  Future<AccountProfile> profile() async {
+    profileCalls++;
+    if (failProfile) throw const ApiException(500, '资料加载失败');
+    return _profile;
+  }
+
+  @override
+  Future<AccountProfile> updateProfile(AccountProfileUpdate update) async {
+    lastUpdate = update;
+    if (failUpdate) throw const ApiException(400, '昵称不可用');
+    _profile = AccountProfile(
+      uid: _profile.uid,
+      nickname: update.nickname ?? _profile.nickname,
+      avatarUrl: _profile.avatarUrl,
+      gender: update.gender ?? _profile.gender,
+      countryCode: _profile.countryCode,
+      regionCode: _profile.regionCode,
+      language: _profile.language,
+      timezone: _profile.timezone,
+      currency: _profile.currency,
+      status: _profile.status,
+      maskedTarget: _profile.maskedTarget,
+      vipLevel: _profile.vipLevel,
+    );
+    return _profile;
+  }
+
+  @override
+  Future<List<AccountDevice>> devices() async {
+    deviceCalls++;
+    if (failDevices) throw const ApiException(500, '设备加载失败');
+    return [..._devices];
+  }
+
+  @override
+  Future<AccountExport> export() async {
+    exportCalls++;
+    if (failExport) throw const ApiException(500, '导出失败');
+    return _export;
+  }
+
+  @override
+  Future<DateTime?> deactivate(String reason) async {
+    lastDeactivateReason = reason;
+    if (failDeactivate) throw const ApiException(100009, '注销申请已在处理中');
+    return DateTime(2026, 11, 3, 9, 30);
+  }
+
+  @override
+  Future<void> cancelDeactivation() async {
+    if (failCancel) {
+      throw const ApiException(100009, '没有待处理的注销申请');
+    }
+  }
+}