:root {
            --bg: #0b1220;
            --card: #111827;
            --accent: #06b6d4;
            --accent-2: #f59e0b;
            --text: #e5e7eb;
            --muted: #9ca3af;
            --glass: rgba(255,255,255,0.06);
            --border: rgba(255,255,255,0.08);
        }
        /* Global offset so content doesn't sit under fixed navbar */
        body { padding-top: 4.5rem; }
        .glass {
            background: var(--glass);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--border);
            box-shadow: 0 10px 30px rgba(0,0,0,0.35);
        }
        .fade-in {
            opacity: 0;
            transform: translateY(12px);
            transition: opacity .6s ease, transform .6s ease;
        }
        .fade-in.is-visible { opacity: 1; transform: translateY(0); }
        .floaty { transition: transform .25s ease, box-shadow .25s ease; }
        .floaty:hover { transform: translateY(-6px); box-shadow: 0 12px 24px rgba(0,0,0,.3); }
        .shimmer {
            position: relative; overflow: hidden;
        }
        .shimmer::after {
            content: ""; position: absolute; inset: 0; transform: translateX(-120%);
            background: linear-gradient(110deg, transparent 0%, rgba(255,255,255,.06) 40%, transparent 60%);
            animation: shimmer 2.2s infinite;
        }
        @keyframes shimmer { 100% { transform: translateX(120%); } }
        .soft-border { border: 1px solid var(--border); }
        .accent-gradient { background: linear-gradient(135deg, var(--accent), #0891b2); }
        .accent-amber { background: linear-gradient(135deg, var(--accent-2), #d97706); }

        .nav-link {
            position: relative;
            padding-bottom: 4px;
            overflow: hidden;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 2px;
            background-color: #38bdf8;
            bottom: 0;
            left: -100%;
            transition: left 0.3s ease-in-out;
        }
        .nav-link:hover::after {
            left: 0;
        }
        .nav-link:hover {
            color: #38bdf8;
            transform: translateY(-1px);
        }
        .nav-link.active {
            color: #f59e0b;
            font-weight: 600;
        }
        .nav-link.active::after {
            left: 0;
            background-color: #f59e0b;
        }
        /* Enhanced navbar */
        #navbar {
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            background: rgba(17, 24, 39, 0.8);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            transition: all 0.3s ease;
        }
        #navbar.scrolled {
            background: rgba(17, 24, 39, 0.95);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        .navbar-logo {
            background: linear-gradient(135deg, #06b6d4, #f59e0b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 800;
            letter-spacing: 1px;
        }
        .mobile-menu-btn {
            transition: all 0.3s ease;
        }
        .mobile-menu-btn:hover {
            transform: scale(1.1);
        }
        .mobile-menu-btn.active {
            transform: rotate(90deg);
        }
        .header-text {
            font-size: 2rem;
            font-weight: bold;
            color: #38bdf8;
            text-align: center;
            height: 50px;
            overflow: hidden;
            position: relative;
        }
        /* Style de la navbar fixée avec fond blanc */
        .navbar-fixed {
            background-color: white;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            transition: background-color 0.3s ease, box-shadow 0.3s ease;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
        }
        /* Buttons */
        .btn {
            position: relative;
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            padding: .75rem 1.25rem;
            border-radius: .75rem;
            border: 1px solid var(--border);
            color: var(--text);
            background: linear-gradient(180deg, rgba(17,24,39,.9), rgba(17,24,39,.7));
            transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
        }
        .btn:hover { transform: translateY(-2px); border-color: rgba(255,255,255,.18); box-shadow: 0 8px 20px rgba(0,0,0,.35); }
        .btn-accent { background: linear-gradient(135deg, var(--accent), #0891b2); border-color: transparent; }
        .btn-amber { background: linear-gradient(135deg, var(--accent-2), #d97706); border-color: transparent; }

        /* Cards */
        .card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: 1rem;
            box-shadow: 0 10px 25px rgba(0,0,0,.25);
        }
        .card-header { border-bottom: 1px solid var(--border); }

        /* Chatbot tweaks */
        #chatbot-panel { border-radius: 1rem; }
        #chatbot-messages { scrollbar-width: thin; }
        #chatbot-messages::-webkit-scrollbar { width: 6px; }
        #chatbot-messages::-webkit-scrollbar-thumb { background: rgba(255,255,255,.12); border-radius: 9999px; }

        /* Loading overlay polish */
        .loading-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.8);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 10000;
        }
        .loading-text {
            font-size: 2rem;
            color: #38bdf8;
            font-weight: bold;
        }