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+import '../core/network/api_client.dart';
+import '../core/network/api_exception.dart';
+import '../core/network/endpoints.dart';
+import '../models/user_model.dart';
+
+/// 认证服务（《03-接口文档》第 3 章）
+class AuthService {
+  AuthService._();
+
+  /// 3.1 发送短信验证码 scene: register/login/reset
+  static Future<void> sendSmsCode(String phone, String scene) async {
+    await ApiClient.I.post(Endpoints.smsSend, data: {'phone': phone, 'scene': scene});
+  }
+
+  /// 3.2 发送邮箱验证码
+  static Future<void> sendEmailCode(String email, String scene) async {
+    await ApiClient.I.post(Endpoints.emailSend, data: {'email': email, 'scene': scene});
+  }
+
+  /// 3.3 注册（type: phone/email，可带邀请码），返回 Token 对与用户信息
+  static Future<LoginResult> register({
+    required String type,
+    required String account,
+    required String code,
+    required String password,
+    String? nickname,
+    String? inviteCode,
+  }) async {
+    final data = await ApiClient.post<Map<String, dynamic>>(Endpoints.register, data: {
+      'type': type,
+      if (type == 'phone') 'phone': account else 'email': account,
+      'code': code,
+      'password': password,
+      if (nickname != null && nickname.isNotEmpty) 'nickname': nickname,
+      if (inviteCode != null && inviteCode.isNotEmpty) 'invite_code': inviteCode,
+    });
+    return _fromTokenData(data);
+  }
+
+  /// 3.4 登录（type: phone_password/phone_code/email_password）
+  static Future<LoginResult> login({
+    required String type,
+    String? phone,
+    String? email,
+    String? password,
+    String? code,
+  }) async {
+    final data = await ApiClient.post<Map<String, dynamic>>(Endpoints.login, data: {
+      'type': type,
+      if (phone != null) 'phone': phone,
+      if (email != null) 'email': email,
+      if (password != null) 'password': password,
+      if (code != null) 'code': code,
+    });
+    return _fromTokenData(data);
+  }
+
+  /// 3.6 退出登录
+  static Future<void> logout() async {
+    try {
+      await ApiClient.I.post(Endpoints.logout);
+    } on ApiException catch (e) {
+      // Token 已失效等情况忽略，本地照常清理
+      if (!e.isUnauthorized) rethrow;
+    }
+  }
+
+  /// 统一解析 Token 响应：access/refresh 入安全存储，user 转模型
+  static LoginResult _fromTokenData(Map<String, dynamic> data) {
+    final user = UserModel.fromJson((data['user'] as Map<String, dynamic>?) ?? const {});
+    final trial = data['trial_granted'] as Map<String, dynamic>?;
+    return LoginResult(
+      user: user,
+      trialPlanName: trial?['plan_name'] as String?,
+    );
+  }
+}
+
+/// 登录/注册结果
+class LoginResult {
+  LoginResult({required this.user, this.trialPlanName});
+
+  final UserModel user;
+
+  /// 注册赠送的体验会员名称（关闭赠送开关时为 null）
+  final String? trialPlanName;
+}