diff --git a/public/index.html b/public/index.html
index b4c8df3..c6f0acd 100644
--- a/public/index.html
+++ b/public/index.html
@@ -4,411 +4,10 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Notes & Todos</title>
-    <style>
-        @import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600&display=swap');
-
-        :root {
-            /* Colors */
-            --bg-gradient: linear-gradient(to bottom right, #f8fafc, #f1f5f9);
-            --primary: #0ea5e9;
-            --primary-light: #e0f2fe;
-            --primary-dark: #0369a1;
-            --surface: #ffffff;
-            --text: #0f172a;
-            --text-light: #64748b;
-            --border: #e2e8f0;
-            --success: #10b981;
-            --error: #ef4444;
-            
-            /* Effects */
-            --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.05);
-            --shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.08);
-            --shadow-lg: 0 8px 24px -4px rgba(0, 0, 0, 0.12);
-            --glow: 0 0 0 3px rgba(14, 165, 233, 0.15);
-        }
-
-        * {
-            margin: 0;
-            padding: 0;
-            box-sizing: border-box;
-        }
-
-        body {
-            font-family: 'Plus Jakarta Sans', sans-serif;
-            background: var(--bg-gradient);
-            color: var(--text);
-            min-height: 100vh;
-            line-height: 1.6;
-            -webkit-font-smoothing: antialiased;
-        }
-
-        /* Top Navigation */
-        .top-nav {
-            background: var(--surface);
-            border-bottom: 1px solid var(--border);
-            padding: 0.75rem 1.5rem;
-            position: fixed;
-            top: 0;
-            left: 0;
-            right: 0;
-            z-index: 50;
-            display: flex;
-            justify-content: space-between;
-            align-items: center;
-            box-shadow: var(--shadow-sm);
-        }
-
-        .nav-brand {
-            font-size: 1.25rem;
-            font-weight: 600;
-            color: var(--text);
-            text-decoration: none;
-            display: flex;
-            align-items: center;
-            gap: 0.5rem;
-        }
-
-        .nav-brand svg {
-            width: 24px;
-            height: 24px;
-            color: var(--primary);
-        }
-
-        .user-menu {
-            display: flex;
-            align-items: center;
-            gap: 1rem;
-        }
-
-        .user-info {
-            display: flex;
-            align-items: center;
-            gap: 0.5rem;
-            padding: 0.5rem 1rem;
-            background: var(--primary-light);
-            border-radius: 8px;
-            color: var(--primary-dark);
-            font-weight: 500;
-        }
-
-        .user-info svg {
-            width: 18px;
-            height: 18px;
-        }
-
-        /* Layout */
-        .app {
-            display: grid;
-            grid-template-columns: 320px 1fr;
-            gap: 1rem;
-            height: 100vh;
-            padding-top: 4rem; /* Space for top nav */
-        }
-
-        /* Sidebar */
-        .sidebar {
-            background: var(--surface);
-            border-radius: 16px;
-            padding: 1.5rem;
-            display: flex;
-            flex-direction: column;
-            gap: 1.5rem;
-            box-shadow: var(--shadow);
-            height: calc(100vh - 5rem);
-            margin: 0.5rem;
-            border: 1px solid var(--border);
-        }
-
-        /* Main Content */
-        .main-content {
-            background: var(--surface);
-            border-radius: 16px;
-            padding: 2rem;
-            box-shadow: var(--shadow);
-            height: calc(100vh - 5rem);
-            margin: 0.5rem;
-            border: 1px solid var(--border);
-            overflow-y: auto;
-        }
-
-        /* Search */
-        .search-container {
-            position: relative;
-        }
-
-        .search-input {
-            width: 100%;
-            padding: 0.875rem 1rem 0.875rem 2.75rem;
-            border: 1px solid var(--border);
-            border-radius: 12px;
-            font-size: 0.9375rem;
-            background: var(--bg-gradient);
-            transition: all 0.2s ease;
-        }
-
-        .search-input:focus {
-            outline: none;
-            border-color: var(--primary);
-            box-shadow: var(--glow);
-            background: var(--surface);
-        }
-
-        /* Notes List */
-        .notes-list {
-            display: flex;
-            flex-direction: column;
-            gap: 0.75rem;
-            overflow-y: auto;
-            padding: 0.5rem;
-        }
-
-        .note-item {
-            padding: 1rem;
-            background: var(--bg-gradient);
-            border: 1px solid var(--border);
-            border-radius: 12px;
-            cursor: pointer;
-            transition: all 0.2s ease;
-        }
-
-        .note-item:hover {
-            transform: translateY(-2px);
-            border-color: var(--primary);
-            box-shadow: var(--shadow);
-        }
-
-        .note-item.active {
-            background: var(--primary-light);
-            border-color: var(--primary);
-        }
-
-        /* Editor */
-        .editor {
-            background: var(--surface);
-            border-radius: 12px;
-            border: 1px solid var(--border);
-            box-shadow: var(--shadow);
-        }
-
-        .editor-title {
-            width: 100%;
-            padding: 1.5rem;
-            font-size: 1.5rem;
-            font-weight: 600;
-            border: none;
-            border-bottom: 1px solid var(--border);
-            background: transparent;
-        }
-
-        .editor-content {
-            padding: 1.5rem;
-            min-height: 300px;
-        }
-
-        /* Admin Panel */
-        .admin-panel {
-            position: fixed;
-            inset: 0;
-            background: rgba(0, 0, 0, 0.5);
-            display: flex;
-            align-items: center;
-            justify-content: center;
-            z-index: 100;
-        }
-
-        .admin-content {
-            background: var(--surface);
-            border-radius: 16px;
-            padding: 2rem;
-            width: 600px;
-            max-width: 90vw;
-            max-height: 90vh;
-            overflow-y: auto;
-            box-shadow: var(--shadow-lg);
-            border: 1px solid var(--border);
-        }
-
-        .admin-header {
-            display: flex;
-            justify-content: space-between;
-            align-items: center;
-            margin-bottom: 2rem;
-            padding-bottom: 1rem;
-            border-bottom: 1px solid var(--border);
-        }
-
-        .user-list {
-            display: flex;
-            flex-direction: column;
-            gap: 1rem;
-        }
-
-        .user-card {
-            background: var(--bg-gradient);
-            border: 1px solid var(--border);
-            border-radius: 12px;
-            padding: 1rem;
-            display: flex;
-            justify-content: space-between;
-            align-items: center;
-        }
-
-        /* Buttons */
-        .btn {
-            padding: 0.75rem 1.5rem;
-            border-radius: 8px;
-            font-weight: 500;
-            font-size: 0.9375rem;
-            transition: all 0.2s ease;
-            border: 1px solid transparent;
-            cursor: pointer;
-            display: inline-flex;
-            align-items: center;
-            gap: 0.5rem;
-        }
-
-        .btn-primary {
-            background: var(--primary);
-            color: white;
-            border-color: var(--primary-dark);
-        }
-
-        .btn-primary:hover {
-            background: var(--primary-dark);
-            transform: translateY(-1px);
-            box-shadow: var(--shadow);
-        }
-
-        .btn-secondary {
-            background: var(--surface);
-            color: var(--text);
-            border-color: var(--border);
-        }
-
-        .btn-secondary:hover {
-            background: var(--bg-gradient);
-            border-color: var(--primary);
-        }
-
-        .btn-icon {
-            padding: 0.5rem;
-            border-radius: 8px;
-            color: var(--text-light);
-            border: 1px solid var(--border);
-            background: var(--surface);
-            transition: all 0.2s ease;
-        }
-
-        .btn-icon:hover {
-            background: var(--primary-light);
-            color: var(--primary);
-            border-color: var(--primary);
-        }
-
-        /* Responsive */
-        @media (max-width: 768px) {
-            .app {
-                grid-template-columns: 1fr;
-            }
-
-            .sidebar {
-                display: none;
-            }
-
-            .main-content {
-                margin: 0.5rem;
-            }
-        }
-    </style>
+    <link rel="stylesheet" href="/css/styles.css">
 </head>
 <body>
-    <!-- Top Navigation -->
-    <nav class="top-nav">
-        <a href="/" class="nav-brand">
-            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                <path d="M12 2L2 7l10 5 10-5-10-5zM2 17l10 5 10-5M2 12l10 5 10-5"></path>
-            </svg>
-            Notes App
-        </a>
-        <div class="user-menu">
-            <div class="user-info">
-                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"></path>
-                    <circle cx="12" cy="7" r="4"></circle>
-                </svg>
-                <span id="user-info">Utilisateur</span>
-            </div>
-            <button class="btn btn-secondary admin-btn" id="admin-btn">
-                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <path d="M12 2a10 10 0 0 0-7.743 16.33l-1.964 1.963A12 12 0 1 1 14.243 3.71L12 6"></path>
-                    <path d="M12 8v4l3 3"></path>
-                </svg>
-                Admin
-            </button>
-            <button class="btn btn-secondary" id="logout-btn">
-                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"></path>
-                    <polyline points="16 17 21 12 16 7"></polyline>
-                    <line x1="21" y1="12" x2="9" y2="12"></line>
-                </svg>
-                Déconnexion
-            </button>
-        </div>
-    </nav>
-
-    <!-- Main App -->
-    <div class="app">
-        <aside class="sidebar">
-            <div class="search-container">
-                <input type="text" class="search-input" placeholder="Rechercher une note...">
-            </div>
-            <button class="btn btn-primary" id="new-note-btn">
-                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <line x1="12" y1="5" x2="12" y2="19"></line>
-                    <line x1="5" y1="12" x2="19" y2="12"></line>
-                </svg>
-                Nouvelle Note
-            </button>
-            <div class="notes-list" id="notes-list">
-                <!-- Notes will be dynamically inserted here -->
-            </div>
-        </aside>
-
-        <main class="main-content">
-            <div class="editor">
-                <input type="text" class="editor-title" placeholder="Titre de la note" id="note-title">
-                <div class="editor-content" contenteditable="true" id="note-content"></div>
-            </div>
-        </main>
-    </div>
-
-    <!-- Admin Panel -->
-    <div id="admin-panel" class="admin-panel hidden">
-        <div class="admin-content">
-            <div class="admin-header">
-                <h2>Administration</h2>
-                <button class="btn-icon" id="close-admin-btn">
-                    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                        <line x1="18" y1="6" x2="6" y2="18"></line>
-                        <line x1="6" y1="6" x2="18" y2="18"></line>
-                    </svg>
-                </button>
-            </div>
-            <button class="btn btn-primary" id="add-user-btn">
-                <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                    <path d="M16 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"></path>
-                    <circle cx="8.5" cy="7" r="4"></circle>
-                    <line x1="20" y1="8" x2="20" y2="14"></line>
-                    <line x1="23" y1="11" x2="17" y2="11"></line>
-                </svg>
-                Ajouter un utilisateur
-            </button>
-            <div class="user-list" id="users-list">
-                <!-- Users will be dynamically inserted here -->
-            </div>
-        </div>
-    </div>
-
+    <div id="root"></div>
     <script src="/js/auth.js"></script>
     <script src="/js/notes.js"></script>
     <script src="/js/admin.js"></script>
diff --git a/public/js/admin.js b/public/js/admin.js
index a7b5aaf..4149579 100644
--- a/public/js/admin.js
+++ b/public/js/admin.js
@@ -7,6 +7,7 @@ class AdminService {
         this.closeAdminBtn = document.getElementById('close-admin-btn');
         this.addUserBtn = document.getElementById('add-user-btn');
         this.usersList = document.getElementById('users-list');
+        this.adminBtn = document.getElementById('admin-btn');
 
         if (this.adminPanel && this.closeAdminBtn && this.addUserBtn && this.usersList) {
             this.setupEventListeners();
@@ -20,6 +21,13 @@ class AdminService {
         if (this.addUserBtn) {
             this.addUserBtn.addEventListener('click', () => this.showAddUserForm());
         }
+        if (this.adminBtn) {
+            this.adminBtn.addEventListener('click', () => {
+                if (this.adminPanel) {
+                    this.adminPanel.classList.remove('hidden');
+                }
+            });
+        }
     }
 
     async loadUsers() {
diff --git a/public/js/auth.js b/public/js/auth.js
index afac4c3..640f9d5 100644
--- a/public/js/auth.js
+++ b/public/js/auth.js
@@ -5,6 +5,7 @@ class AuthService {
         this.loginForm = document.getElementById('login-form');
         this.logoutBtn = document.getElementById('logout-btn');
         this.userInfo = document.getElementById('user-info');
+        this.adminPanel = document.getElementById('admin-panel');
         
         this.setupEventListeners();
         this.updateUI();
@@ -63,7 +64,11 @@ class AuthService {
     updateUI() {
         const authContainer = document.getElementById('auth-container');
         const appContainer = document.getElementById('app-container');
-        const adminPanel = document.getElementById('admin-panel');
+        
+        // S'assurer que le panneau d'administration est caché au démarrage
+        if (this.adminPanel) {
+            this.adminPanel.classList.add('hidden');
+        }
 
         if (this.token && this.user) {
             if (authContainer) authContainer.classList.add('hidden');
@@ -78,7 +83,7 @@ class AuthService {
                     adminBtn.className = 'admin-btn ml-4 text-sm text-gray-600 hover:text-gray-900';
                     adminBtn.textContent = 'Admin';
                     adminBtn.onclick = () => {
-                        if (adminPanel) adminPanel.classList.remove('hidden');
+                        if (this.adminPanel) this.adminPanel.classList.remove('hidden');
                     };
                     this.userInfo.parentNode.insertBefore(adminBtn, this.logoutBtn);
                 }