feat(admin): panneau Paramètres - sauvegarde config + test SMTP

- Onglet Paramètres dans l'admin avec 3 sections (Email, Personnalisation, Avancé)
- Service ConfigurationService (GET config, PATCH bulk, POST test-smtp)
- Bouton Sauvegarder et bouton Tester SMTP (sauvegarde avant test)
- Endpoints api_config pour configuration

Closes #15

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/lib/screens/administrateurs/admin_dashboardScreen.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:p_tits_pas/widgets/admin/assistante_maternelle_management_widget.dart';
 import 'package:p_tits_pas/widgets/admin/gestionnaire_management_widget.dart';
 import 'package:p_tits_pas/widgets/admin/parent_managmant_widget.dart';
+import 'package:p_tits_pas/widgets/admin/parametres_panel.dart';
 import 'package:p_tits_pas/widgets/app_footer.dart';
 import 'package:p_tits_pas/widgets/admin/dashboard_admin.dart';
 
@@ -9,15 +10,25 @@ class AdminDashboardScreen extends StatefulWidget {
   const AdminDashboardScreen({super.key});
 
   @override
-  _AdminDashboardScreenState createState() => _AdminDashboardScreenState();
+  State<AdminDashboardScreen> createState() => _AdminDashboardScreenState();
 }
 
 class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
-  int selectedIndex = 0;
+  /// 0 = Gestion des utilisateurs, 1 = Paramètres
+  int mainTabIndex = 0;
 
-  void onTabChange(int index) {
+  /// Sous-onglet quand mainTabIndex == 0 : 0=Gestionnaires, 1=Parents, 2=AM, 3=Administrateurs
+  int subIndex = 0;
+
+  void onMainTabChange(int index) {
     setState(() {
-      selectedIndex = index;
+      mainTabIndex = index;
+    });
+  }
+
+  void onSubTabChange(int index) {
+    setState(() {
+      subIndex = index;
     });
   }
 
@@ -33,13 +44,18 @@ class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
             ),
           ),
           child: DashboardAppBarAdmin(
-            selectedIndex: selectedIndex,
-            onTabChange: onTabChange,
+            selectedIndex: mainTabIndex,
+            onTabChange: onMainTabChange,
           ),
         ),
       ),
       body: Column(
         children: [
+          if (mainTabIndex == 0)
+            DashboardUserManagementSubBar(
+              selectedSubIndex: subIndex,
+              onSubTabChange: onSubTabChange,
+            ),
           Expanded(
             child: _getBody(),
           ),
@@ -50,17 +66,20 @@ class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
   }
 
   Widget _getBody() {
-    switch (selectedIndex) {
+    if (mainTabIndex == 1) {
+      return const ParametresPanel();
+    }
+    switch (subIndex) {
       case 0:
-        return  const GestionnaireManagementWidget();
+        return const GestionnaireManagementWidget();
       case 1:
         return const ParentManagementWidget();
       case 2:
         return const AssistanteMaternelleManagementWidget();
       case 3:
-        return const Center(child: Text("👨‍💼 Administrateurs"));
+        return const Center(child: Text('👨‍💼 Administrateurs'));
       default:
-        return const Center(child: Text("Page non trouvée"));
+        return const Center(child: Text('Page non trouvée'));
     }
   }
 }

frontend/lib/services/api/api_config.dart

@@ -14,6 +14,13 @@ class ApiConfig {
   static const String userProfile = '/users/profile';
   static const String userChildren = '/users/children';
 
+  // Configuration (admin)
+  static const String configuration = '/configuration';
+  static const String configurationSetupStatus = '/configuration/setup/status';
+  static const String configurationSetupComplete = '/configuration/setup/complete';
+  static const String configurationTestSmtp = '/configuration/test-smtp';
+  static const String configurationBulk = '/configuration/bulk';
+
   // Dashboard endpoints
   static const String dashboard = '/dashboard';
   static const String events = '/events';

frontend/lib/services/configuration_service.dart

@@ -0,0 +1,139 @@
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+import 'api/api_config.dart';
+import 'api/tokenService.dart';
+
+/// Réponse GET /configuration (liste complète)
+class ConfigItem {
+  final String cle;
+  final String? valeur;
+  final String type;
+  final String? categorie;
+  final String? description;
+
+  ConfigItem({
+    required this.cle,
+    this.valeur,
+    required this.type,
+    this.categorie,
+    this.description,
+  });
+
+  factory ConfigItem.fromJson(Map<String, dynamic> json) {
+    return ConfigItem(
+      cle: json['cle'] as String,
+      valeur: json['valeur'] as String?,
+      type: json['type'] as String? ?? 'string',
+      categorie: json['categorie'] as String?,
+      description: json['description'] as String?,
+    );
+  }
+}
+
+/// Réponse GET /configuration/:category (objet clé -> { value, type, description })
+class ConfigValueItem {
+  final dynamic value;
+  final String type;
+  final String? description;
+
+  ConfigValueItem({required this.value, required this.type, this.description});
+
+  factory ConfigValueItem.fromJson(Map<String, dynamic> json) {
+    return ConfigValueItem(
+      value: json['value'],
+      type: json['type'] as String? ?? 'string',
+      description: json['description'] as String?,
+    );
+  }
+}
+
+class ConfigurationService {
+  static Future<Map<String, String>> _headers() async {
+    final token = await TokenService.getToken();
+    return token != null
+        ? ApiConfig.authHeaders(token)
+        : Map<String, String>.from(ApiConfig.headers);
+  }
+
+  /// GET /api/v1/configuration/setup/status
+  static Future<bool> getSetupStatus() async {
+    final response = await http.get(
+      Uri.parse('${ApiConfig.baseUrl}${ApiConfig.configurationSetupStatus}'),
+      headers: await _headers(),
+    );
+    if (response.statusCode != 200) return true;
+    final data = jsonDecode(response.body);
+    return data['data']?['setupCompleted'] as bool? ?? true;
+  }
+
+  /// GET /api/v1/configuration (toutes les configs)
+  static Future<List<ConfigItem>> getAll() async {
+    final response = await http.get(
+      Uri.parse('${ApiConfig.baseUrl}${ApiConfig.configuration}'),
+      headers: await _headers(),
+    );
+    if (response.statusCode != 200) {
+      throw Exception(
+        (jsonDecode(response.body) as Map)['message'] ?? 'Erreur chargement configuration',
+      );
+    }
+    final data = jsonDecode(response.body);
+    final list = data['data'] as List<dynamic>? ?? [];
+    return list.map((e) => ConfigItem.fromJson(e as Map<String, dynamic>)).toList();
+  }
+
+  /// GET /api/v1/configuration/:category
+  static Future<Map<String, ConfigValueItem>> getByCategory(String category) async {
+    final response = await http.get(
+      Uri.parse('${ApiConfig.baseUrl}${ApiConfig.configuration}/$category'),
+      headers: await _headers(),
+    );
+    if (response.statusCode != 200) {
+      throw Exception(
+        (jsonDecode(response.body) as Map)['message'] ?? 'Erreur chargement configuration',
+      );
+    }
+    final data = jsonDecode(response.body);
+    final map = data['data'] as Map<String, dynamic>? ?? {};
+    return map.map((k, v) => MapEntry(k, ConfigValueItem.fromJson(v as Map<String, dynamic>)));
+  }
+
+  /// PATCH /api/v1/configuration/bulk
+  static Future<void> updateBulk(Map<String, dynamic> body) async {
+    final response = await http.patch(
+      Uri.parse('${ApiConfig.baseUrl}${ApiConfig.configurationBulk}'),
+      headers: await _headers(),
+      body: jsonEncode(body),
+    );
+    if (response.statusCode != 200) {
+      final err = jsonDecode(response.body) as Map;
+      throw Exception(err['message'] ?? 'Erreur lors de la sauvegarde');
+    }
+  }
+
+  /// POST /api/v1/configuration/test-smtp
+  static Future<String> testSmtp(String testEmail) async {
+    final response = await http.post(
+      Uri.parse('${ApiConfig.baseUrl}${ApiConfig.configurationTestSmtp}'),
+      headers: await _headers(),
+      body: jsonEncode({'testEmail': testEmail}),
+    );
+    final data = jsonDecode(response.body) as Map;
+    if (response.statusCode == 200 && data['success'] == true) {
+      return data['message'] as String? ?? 'Test SMTP réussi.';
+    }
+    throw Exception(data['error'] ?? data['message'] ?? 'Échec du test SMTP');
+  }
+
+  /// POST /api/v1/configuration/setup/complete (après première config)
+  static Future<void> completeSetup() async {
+    final response = await http.post(
+      Uri.parse('${ApiConfig.baseUrl}${ApiConfig.configurationSetupComplete}'),
+      headers: await _headers(),
+    );
+    if (response.statusCode != 200) {
+      final err = jsonDecode(response.body) as Map;
+      throw Exception(err['message'] ?? 'Erreur finalisation configuration');
+    }
+  }
+}

frontend/lib/widgets/admin/dashboard_admin.dart

@@ -1,47 +1,47 @@
 import 'package:flutter/material.dart';
 
+/// Barre principale du dashboard admin : 2 onglets (Gestion des utilisateurs | Paramètres) + infos utilisateur.
 class DashboardAppBarAdmin extends StatelessWidget implements PreferredSizeWidget {
   final int selectedIndex;
   final ValueChanged<int> onTabChange;
 
-  const DashboardAppBarAdmin({Key? key, required this.selectedIndex, required this.onTabChange}) : super(key: key);
+  const DashboardAppBarAdmin({
+    Key? key,
+    required this.selectedIndex,
+    required this.onTabChange,
+  }) : super(key: key);
 
   @override
   Size get preferredSize => const Size.fromHeight(kToolbarHeight + 10);
 
   @override
   Widget build(BuildContext context) {
-    final isMobile = MediaQuery.of(context).size.width < 768;
     return AppBar(
       elevation: 0,
       automaticallyImplyLeading: false,
       title: Row(
         children: [
-          SizedBox(width: MediaQuery.of(context).size.width * 0.19),
-          const Text(
-            "P'tit Pas",
-            style: TextStyle(
-              color: Color(0xFF9CC5C0),
-              fontWeight: FontWeight.bold,
-              fontSize: 18,
+          const SizedBox(width: 24),
+          Image.asset(
+            'assets/images/logo.png',
+            height: 40,
+            fit: BoxFit.contain,
+          ),
+          Expanded(
+            child: Center(
+              child: Row(
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  _buildNavItem(context, 'Gestion des utilisateurs', 0),
+                  const SizedBox(width: 24),
+                  _buildNavItem(context, 'Paramètres', 1),
+                ],
+              ),
             ),
           ),
-          SizedBox(width: MediaQuery.of(context).size.width * 0.1),
-
-          // Navigation principale
-          _buildNavItem(context, 'Gestionnaires', 0),
-          const SizedBox(width: 24),
-          _buildNavItem(context, 'Parents', 1),
-          const SizedBox(width: 24),
-          _buildNavItem(context, 'Assistantes maternelles', 2),
-          const SizedBox(width: 24),
-          _buildNavItem(context, 'Administrateurs', 3),
         ],
       ),
-      actions: isMobile
-          ? [_buildMobileMenu(context)]
-          : [
-        // Nom de l'utilisateur
+      actions: [
         const Padding(
           padding: EdgeInsets.symmetric(horizontal: 16),
           child: Center(
@@ -55,8 +55,6 @@ class DashboardAppBarAdmin extends StatelessWidget implements PreferredSizeWidge
             ),
           ),
         ),
-        
-        // Bouton déconnexion
         Padding(
           padding: const EdgeInsets.only(right: 16),
           child: TextButton(
@@ -72,51 +70,30 @@ class DashboardAppBarAdmin extends StatelessWidget implements PreferredSizeWidge
             child: const Text('Se déconnecter'),
           ),
         ),
-        SizedBox(width: MediaQuery.of(context).size.width * 0.1),
       ],
     );
   }
 
   Widget _buildNavItem(BuildContext context, String title, int index) {
-  final bool isActive = index == selectedIndex;
-  return InkWell(
-    onTap: () => onTabChange(index),
-    child: Container(
-      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
-      decoration: BoxDecoration(
-        color: isActive ? const Color(0xFF9CC5C0) : Colors.transparent,
-        borderRadius: BorderRadius.circular(20),
-        border: isActive ? null : Border.all(color: Colors.black26),
-      ),
-      child: Text(
-        title,
-        style: TextStyle(
-          color: isActive ? Colors.white : Colors.black,
-          fontWeight: isActive ? FontWeight.w600 : FontWeight.normal,
-          fontSize: 14,
+    final bool isActive = index == selectedIndex;
+    return InkWell(
+      onTap: () => onTabChange(index),
+      child: Container(
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+        decoration: BoxDecoration(
+          color: isActive ? const Color(0xFF9CC5C0) : Colors.transparent,
+          borderRadius: BorderRadius.circular(20),
+          border: isActive ? null : Border.all(color: Colors.black26),
+        ),
+        child: Text(
+          title,
+          style: TextStyle(
+            color: isActive ? Colors.white : Colors.black,
+            fontWeight: isActive ? FontWeight.w600 : FontWeight.normal,
+            fontSize: 14,
+          ),
         ),
       ),
-    ),
-  );
-}
-
-
-  Widget _buildMobileMenu(BuildContext context) {
-    return PopupMenuButton<int>(
-      icon: const Icon(Icons.menu, color: Colors.white),
-      onSelected: (value) {
-        if (value == 4) {
-          _handleLogout(context);
-        }
-      },
-      itemBuilder: (context) => [
-        const PopupMenuItem(value: 0, child: Text("Gestionnaires")),
-        const PopupMenuItem(value: 1, child: Text("Parents")),
-        const PopupMenuItem(value: 2, child: Text("Assistantes maternelles")),
-        const PopupMenuItem(value: 3, child: Text("Administrateurs")),
-        const PopupMenuDivider(),
-        const PopupMenuItem(value: 4, child: Text("Se déconnecter")),
-      ],
     );
   }
 
@@ -143,3 +120,64 @@ class DashboardAppBarAdmin extends StatelessWidget implements PreferredSizeWidge
     );
   }
 }
+
+/// Sous-barre affichée quand "Gestion des utilisateurs" est actif : 4 onglets sans infos utilisateur.
+class DashboardUserManagementSubBar extends StatelessWidget {
+  final int selectedSubIndex;
+  final ValueChanged<int> onSubTabChange;
+
+  const DashboardUserManagementSubBar({
+    Key? key,
+    required this.selectedSubIndex,
+    required this.onSubTabChange,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      height: 48,
+      decoration: BoxDecoration(
+        color: Colors.grey.shade100,
+        border: Border(bottom: BorderSide(color: Colors.grey.shade300)),
+      ),
+      padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 6),
+      child: Center(
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            _buildSubNavItem(context, 'Gestionnaires', 0),
+            const SizedBox(width: 16),
+            _buildSubNavItem(context, 'Parents', 1),
+            const SizedBox(width: 16),
+            _buildSubNavItem(context, 'Assistantes maternelles', 2),
+            const SizedBox(width: 16),
+            _buildSubNavItem(context, 'Administrateurs', 3),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildSubNavItem(BuildContext context, String title, int index) {
+    final bool isActive = index == selectedSubIndex;
+    return InkWell(
+      onTap: () => onSubTabChange(index),
+      child: Container(
+        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 6),
+        decoration: BoxDecoration(
+          color: isActive ? const Color(0xFF9CC5C0) : Colors.transparent,
+          borderRadius: BorderRadius.circular(16),
+          border: isActive ? null : Border.all(color: Colors.black26),
+        ),
+        child: Text(
+          title,
+          style: TextStyle(
+            color: isActive ? Colors.white : Colors.black87,
+            fontWeight: isActive ? FontWeight.w600 : FontWeight.normal,
+            fontSize: 13,
+          ),
+        ),
+      ),
+    );
+  }
+}

frontend/lib/widgets/admin/parametres_panel.dart

@@ -0,0 +1,411 @@
+import 'package:flutter/material.dart';
+import 'package:p_tits_pas/services/configuration_service.dart';
+
+/// Panneau Paramètres / Configuration (ticket #15) : 3 sections sur une page.
+class ParametresPanel extends StatefulWidget {
+  const ParametresPanel({super.key});
+
+  @override
+  State<ParametresPanel> createState() => _ParametresPanelState();
+}
+
+class _ParametresPanelState extends State<ParametresPanel> {
+  final _formKey = GlobalKey<FormState>();
+  bool _isLoading = true;
+  String? _loadError;
+  bool _isSaving = false;
+  String? _message;
+
+  final Map<String, TextEditingController> _controllers = {};
+  bool _smtpSecure = false;
+  bool _smtpAuthRequired = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _createControllers();
+    _loadConfiguration();
+  }
+
+  void _createControllers() {
+    final keys = [
+      'smtp_host', 'smtp_port', 'smtp_user', 'smtp_password',
+      'email_from_name', 'email_from_address',
+      'app_name', 'app_url', 'app_logo_url',
+      'password_reset_token_expiry_days', 'jwt_expiry_hours', 'max_upload_size_mb',
+    ];
+    for (final k in keys) {
+      _controllers[k] = TextEditingController();
+    }
+  }
+
+  Future<void> _loadConfiguration() async {
+    setState(() {
+      _isLoading = true;
+      _loadError = null;
+    });
+    try {
+      final list = await ConfigurationService.getAll();
+      if (!mounted) return;
+      for (final item in list) {
+        final c = _controllers[item.cle];
+        if (c != null && item.valeur != null && item.valeur != '***********') {
+          c.text = item.valeur!;
+        }
+        if (item.cle == 'smtp_secure') {
+          _smtpSecure = item.valeur == 'true';
+        }
+        if (item.cle == 'smtp_auth_required') {
+          _smtpAuthRequired = item.valeur == 'true';
+        }
+      }
+      setState(() {
+        _isLoading = false;
+      });
+    } catch (e) {
+      if (mounted) {
+        setState(() {
+          _isLoading = false;
+          _loadError = e.toString().replaceAll('Exception: ', '');
+        });
+      }
+    }
+  }
+
+  @override
+  void dispose() {
+    for (final c in _controllers.values) {
+      c.dispose();
+    }
+    super.dispose();
+  }
+
+  Map<String, dynamic> _buildPayload() {
+    final payload = <String, dynamic>{};
+    payload['smtp_host'] = _controllers['smtp_host']!.text.trim();
+    final port = int.tryParse(_controllers['smtp_port']!.text.trim());
+    if (port != null) payload['smtp_port'] = port;
+    payload['smtp_secure'] = _smtpSecure;
+    payload['smtp_auth_required'] = _smtpAuthRequired;
+    payload['smtp_user'] = _controllers['smtp_user']!.text.trim();
+    final pwd = _controllers['smtp_password']!.text.trim();
+    if (pwd.isNotEmpty && pwd != '***********') payload['smtp_password'] = pwd;
+    payload['email_from_name'] = _controllers['email_from_name']!.text.trim();
+    payload['email_from_address'] = _controllers['email_from_address']!.text.trim();
+    payload['app_name'] = _controllers['app_name']!.text.trim();
+    payload['app_url'] = _controllers['app_url']!.text.trim();
+    payload['app_logo_url'] = _controllers['app_logo_url']!.text.trim();
+    final tokenDays = int.tryParse(_controllers['password_reset_token_expiry_days']!.text.trim());
+    if (tokenDays != null) payload['password_reset_token_expiry_days'] = tokenDays;
+    final jwtHours = int.tryParse(_controllers['jwt_expiry_hours']!.text.trim());
+    if (jwtHours != null) payload['jwt_expiry_hours'] = jwtHours;
+    final maxMb = int.tryParse(_controllers['max_upload_size_mb']!.text.trim());
+    if (maxMb != null) payload['max_upload_size_mb'] = maxMb;
+    return payload;
+  }
+
+  Future<void> _save() async {
+    setState(() {
+      _message = null;
+      _isSaving = true;
+    });
+    try {
+      await ConfigurationService.updateBulk(_buildPayload());
+      if (!mounted) return;
+      setState(() {
+        _isSaving = false;
+        _message = 'Configuration enregistrée.';
+      });
+    } catch (e) {
+      if (mounted) {
+        setState(() {
+          _isSaving = false;
+          _message = e.toString().replaceAll('Exception: ', '');
+        });
+      }
+    }
+  }
+
+  Future<void> _testSmtp() async {
+    final email = await showDialog<String>(
+      context: context,
+      builder: (ctx) {
+        final c = TextEditingController();
+        return AlertDialog(
+          title: const Text('Tester la connexion SMTP'),
+          content: TextField(
+            controller: c,
+            decoration: const InputDecoration(
+              labelText: 'Email pour recevoir le test',
+              hintText: 'admin@example.com',
+            ),
+            keyboardType: TextInputType.emailAddress,
+          ),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(ctx),
+              child: const Text('Annuler'),
+            ),
+            FilledButton(
+              onPressed: () {
+                final t = c.text.trim();
+                if (t.isNotEmpty) Navigator.pop(ctx, t);
+              },
+              child: const Text('Envoyer'),
+            ),
+          ],
+        );
+      },
+    );
+    if (email == null || !mounted) return;
+    setState(() => _message = null);
+    try {
+      await _save();
+      if (!mounted) return;
+      final msg = await ConfigurationService.testSmtp(email);
+      if (!mounted) return;
+      setState(() => _message = msg);
+    } catch (e) {
+      if (mounted) {
+        setState(() => _message = e.toString().replaceAll('Exception: ', ''));
+      }
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (_isLoading) {
+      return const Center(child: CircularProgressIndicator());
+    }
+    if (_loadError != null) {
+      return Center(
+        child: Padding(
+          padding: const EdgeInsets.all(24),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              Text(_loadError!, style: TextStyle(color: Colors.red.shade700)),
+              const SizedBox(height: 16),
+              FilledButton(
+                onPressed: _loadConfiguration,
+                child: const Text('Réessayer'),
+              ),
+            ],
+          ),
+        ),
+      );
+    }
+
+    final isSuccess = _message != null &&
+        (_message!.startsWith('Configuration') || _message!.startsWith('Connexion'));
+
+    return Form(
+      key: _formKey,
+      child: SingleChildScrollView(
+        padding: const EdgeInsets.all(24),
+        child: Center(
+          child: ConstrainedBox(
+            constraints: const BoxConstraints(maxWidth: 720),
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.stretch,
+              children: [
+                if (_message != null) ...[
+                  _MessageBanner(message: _message!, isSuccess: isSuccess),
+                  const SizedBox(height: 20),
+                ],
+                _buildSectionCard(
+                  context,
+                  icon: Icons.email_outlined,
+                  title: 'Configuration Email (SMTP)',
+                    child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      _buildField('smtp_host', 'Serveur SMTP', hint: 'mail.example.com'),
+                      const SizedBox(height: 14),
+                      _buildField('smtp_port', 'Port SMTP', keyboard: TextInputType.number, hint: '25, 465, 587'),
+                      const SizedBox(height: 14),
+                      Padding(
+                        padding: const EdgeInsets.only(bottom: 14),
+                        child: Row(
+                          children: [
+                            Checkbox(
+                              value: _smtpSecure,
+                              onChanged: (v) => setState(() => _smtpSecure = v ?? false),
+                              activeColor: const Color(0xFF9CC5C0),
+                            ),
+                            const Text('SSL/TLS (secure)'),
+                            const SizedBox(width: 24),
+                            Checkbox(
+                              value: _smtpAuthRequired,
+                              onChanged: (v) => setState(() => _smtpAuthRequired = v ?? false),
+                              activeColor: const Color(0xFF9CC5C0),
+                            ),
+                            const Text('Authentification requise'),
+                          ],
+                        ),
+                      ),
+                      _buildField('smtp_user', 'Utilisateur SMTP'),
+                      const SizedBox(height: 14),
+                      _buildField('smtp_password', 'Mot de passe SMTP', obscure: true),
+                      const SizedBox(height: 14),
+                      _buildField('email_from_name', 'Nom expéditeur'),
+                      const SizedBox(height: 14),
+                      _buildField('email_from_address', 'Email expéditeur', hint: 'no-reply@example.com'),
+                      const SizedBox(height: 18),
+                      Align(
+                        alignment: Alignment.centerRight,
+                        child: OutlinedButton.icon(
+                          onPressed: _isSaving ? null : _testSmtp,
+                          icon: const Icon(Icons.send_outlined, size: 18),
+                          label: const Text('Tester la connexion SMTP'),
+                          style: OutlinedButton.styleFrom(
+                            foregroundColor: const Color(0xFF2D6A4F),
+                            side: const BorderSide(color: Color(0xFF9CC5C0)),
+                            padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 12),
+                          ),
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+                const SizedBox(height: 24),
+                _buildSectionCard(
+                  context,
+                  icon: Icons.palette_outlined,
+                  title: 'Personnalisation',
+                    child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      _buildField('app_name', 'Nom de l\'application'),
+                      const SizedBox(height: 14),
+                      _buildField('app_url', 'URL de l\'application', hint: 'https://app.example.com'),
+                      const SizedBox(height: 14),
+                      _buildField('app_logo_url', 'URL du logo', hint: '/assets/logo.png'),
+                    ],
+                  ),
+                ),
+                const SizedBox(height: 24),
+                _buildSectionCard(
+                  context,
+                  icon: Icons.settings_outlined,
+                  title: 'Paramètres avancés',
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      _buildField('password_reset_token_expiry_days', 'Validité token MDP (jours)', keyboard: TextInputType.number),
+                      const SizedBox(height: 14),
+                      _buildField('jwt_expiry_hours', 'Validité session JWT (heures)', keyboard: TextInputType.number),
+                      const SizedBox(height: 14),
+                      _buildField('max_upload_size_mb', 'Taille max upload (MB)', keyboard: TextInputType.number),
+                    ],
+                  ),
+                ),
+                const SizedBox(height: 28),
+                SizedBox(
+                  height: 48,
+                  child: FilledButton(
+                    onPressed: _isSaving ? null : _save,
+                    style: FilledButton.styleFrom(
+                      backgroundColor: const Color(0xFF9CC5C0),
+                      foregroundColor: Colors.white,
+                    ),
+                    child: _isSaving
+                        ? const SizedBox(width: 24, height: 24, child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white))
+                        : const Text('Sauvegarder la configuration'),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildSectionCard(BuildContext context, {required IconData icon, required String title, required Widget child}) {
+    return Card(
+      elevation: 2,
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+      child: Padding(
+        padding: const EdgeInsets.all(24),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              children: [
+                Icon(icon, size: 22, color: const Color(0xFF9CC5C0)),
+                const SizedBox(width: 10),
+                Text(
+                  title,
+                  style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                        fontWeight: FontWeight.bold,
+                        color: const Color(0xFF2D6A4F),
+                      ),
+                ),
+              ],
+            ),
+            const SizedBox(height: 20),
+            child,
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildField(String key, String label, {bool obscure = false, TextInputType? keyboard, String? hint}) {
+    final c = _controllers[key];
+    if (c == null) return const SizedBox.shrink();
+    return TextFormField(
+      controller: c,
+      obscureText: obscure,
+      keyboardType: keyboard,
+      enabled: !_isSaving,
+      decoration: InputDecoration(
+        labelText: label,
+        hintText: hint,
+        border: const OutlineInputBorder(),
+        contentPadding: const EdgeInsets.symmetric(horizontal: 12, vertical: 12),
+      ),
+    );
+  }
+}
+
+class _MessageBanner extends StatelessWidget {
+  final String message;
+  final bool isSuccess;
+
+  const _MessageBanner({required this.message, required this.isSuccess});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
+      decoration: BoxDecoration(
+        color: isSuccess ? Colors.green.shade50 : Colors.red.shade50,
+        borderRadius: BorderRadius.circular(10),
+        border: Border.all(
+          color: isSuccess ? Colors.green.shade200 : Colors.red.shade200,
+        ),
+      ),
+      child: Row(
+        children: [
+          Icon(
+            isSuccess ? Icons.check_circle_outline : Icons.error_outline,
+            size: 22,
+            color: isSuccess ? Colors.green.shade700 : Colors.red.shade700,
+          ),
+          const SizedBox(width: 12),
+          Expanded(
+            child: Text(
+              message,
+              style: TextStyle(
+                color: isSuccess ? Colors.green.shade900 : Colors.red.shade900,
+                fontSize: 14,
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}