diff --git a/frontend/lib/screens/administrateurs/admin_dashboardScreen.dart b/frontend/lib/screens/administrateurs/admin_dashboardScreen.dart
index be288bd..ff67e5f 100644
--- a/frontend/lib/screens/administrateurs/admin_dashboardScreen.dart
+++ b/frontend/lib/screens/administrateurs/admin_dashboardScreen.dart
@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:p_tits_pas/services/configuration_service.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';
@@ -14,12 +15,34 @@ class AdminDashboardScreen extends StatefulWidget {
 }
 
 class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
+  /// null = chargement du statut setup, true/false = connu
+  bool? _setupCompleted;
+
   /// 0 = Gestion des utilisateurs, 1 = Paramètres
   int mainTabIndex = 0;
 
   /// Sous-onglet quand mainTabIndex == 0 : 0=Gestionnaires, 1=Parents, 2=AM, 3=Administrateurs
   int subIndex = 0;
 
+  @override
+  void initState() {
+    super.initState();
+    _loadSetupStatus();
+  }
+
+  Future<void> _loadSetupStatus() async {
+    try {
+      final completed = await ConfigurationService.getSetupStatus();
+      if (!mounted) return;
+      setState(() {
+        _setupCompleted = completed;
+        if (!completed) mainTabIndex = 1;
+      });
+    } catch (_) {
+      if (mounted) setState(() => _setupCompleted = true);
+    }
+  }
+
   void onMainTabChange(int index) {
     setState(() {
       mainTabIndex = index;
@@ -34,6 +57,11 @@ class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
 
   @override
   Widget build(BuildContext context) {
+    if (_setupCompleted == null) {
+      return const Scaffold(
+        body: Center(child: CircularProgressIndicator()),
+      );
+    }
     return Scaffold(
       appBar: PreferredSize(
         preferredSize: const Size.fromHeight(60.0),
@@ -46,6 +74,7 @@ class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
           child: DashboardAppBarAdmin(
             selectedIndex: mainTabIndex,
             onTabChange: onMainTabChange,
+            setupCompleted: _setupCompleted!,
           ),
         ),
       ),
@@ -67,7 +96,9 @@ class _AdminDashboardScreenState extends State<AdminDashboardScreen> {
 
   Widget _getBody() {
     if (mainTabIndex == 1) {
-      return const ParametresPanel();
+      return ParametresPanel(
+        onSetupCompleted: () => setState(() => _setupCompleted = true),
+      );
     }
     switch (subIndex) {
       case 0:
diff --git a/frontend/lib/widgets/admin/dashboard_admin.dart b/frontend/lib/widgets/admin/dashboard_admin.dart
index d19030a..c32644c 100644
--- a/frontend/lib/widgets/admin/dashboard_admin.dart
+++ b/frontend/lib/widgets/admin/dashboard_admin.dart
@@ -4,11 +4,14 @@ import 'package:flutter/material.dart';
 class DashboardAppBarAdmin extends StatelessWidget implements PreferredSizeWidget {
   final int selectedIndex;
   final ValueChanged<int> onTabChange;
+  /// Si false, l'onglet "Gestion des utilisateurs" est grisé et inaccessible.
+  final bool setupCompleted;
 
   const DashboardAppBarAdmin({
     Key? key,
     required this.selectedIndex,
     required this.onTabChange,
+    this.setupCompleted = true,
   }) : super(key: key);
 
   @override
@@ -32,9 +35,9 @@ class DashboardAppBarAdmin extends StatelessWidget implements PreferredSizeWidge
               child: Row(
                 mainAxisSize: MainAxisSize.min,
                 children: [
-                  _buildNavItem(context, 'Gestion des utilisateurs', 0),
+                  _buildNavItem(context, 'Gestion des utilisateurs', 0, enabled: setupCompleted),
                   const SizedBox(width: 24),
-                  _buildNavItem(context, 'Paramètres', 1),
+                  _buildNavItem(context, 'Paramètres', 1, enabled: true),
                 ],
               ),
             ),
@@ -74,23 +77,26 @@ class DashboardAppBarAdmin extends StatelessWidget implements PreferredSizeWidge
     );
   }
 
-  Widget _buildNavItem(BuildContext context, String title, int index) {
+  Widget _buildNavItem(BuildContext context, String title, int index, {bool enabled = true}) {
     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,
+      onTap: enabled ? () => onTabChange(index) : null,
+      child: Opacity(
+        opacity: enabled ? 1.0 : 0.5,
+        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,
+            ),
           ),
         ),
       ),
diff --git a/frontend/lib/widgets/admin/parametres_panel.dart b/frontend/lib/widgets/admin/parametres_panel.dart
index c50ecdd..c7c6fe0 100644
--- a/frontend/lib/widgets/admin/parametres_panel.dart
+++ b/frontend/lib/widgets/admin/parametres_panel.dart
@@ -3,7 +3,10 @@ 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});
+  /// Appelé après une sauvegarde réussie (pour débloquer le reste du dashboard si config initiale).
+  final VoidCallback? onSetupCompleted;
+
+  const ParametresPanel({super.key, this.onSetupCompleted});
 
   @override
   State<ParametresPanel> createState() => _ParametresPanelState();
@@ -104,6 +107,12 @@ class _ParametresPanelState extends State<ParametresPanel> {
     return payload;
   }
 
+  /// Enregistre en base sans marquer la config initiale comme terminée (utilisé avant test SMTP).
+  Future<void> _saveBulkOnly() async {
+    await ConfigurationService.updateBulk(_buildPayload());
+  }
+
+  /// Sauvegarde + marque la config initiale comme terminée + débloque les panneaux.
   Future<void> _save() async {
     setState(() {
       _message = null;
@@ -112,6 +121,9 @@ class _ParametresPanelState extends State<ParametresPanel> {
     try {
       await ConfigurationService.updateBulk(_buildPayload());
       if (!mounted) return;
+      await ConfigurationService.completeSetup();
+      if (!mounted) return;
+      widget.onSetupCompleted?.call();
       setState(() {
         _isSaving = false;
         _message = 'Configuration enregistrée.';
@@ -160,7 +172,7 @@ class _ParametresPanelState extends State<ParametresPanel> {
     if (email == null || !mounted) return;
     setState(() => _message = null);
     try {
-      await _save();
+      await _saveBulkOnly();
       if (!mounted) return;
       final msg = await ConfigurationService.testSmtp(email);
       if (!mounted) return;