:root {
            --primary: #007bff;
            --primary-dark: #0056b3;
            --text: #333;
            --bg-light: #f8f9fa;
        }

        body {
            font-family: 'Segoe UI', sans-serif;
            margin: 0;
            padding: 0;
            color: var(--text);
            line-height: 1.6;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        /* NAVIGATION */
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 5%;
            background: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text);
            margin-left: 20px;
            font-weight: 600;
        }

        .btn-nav {
            background: var(--primary);
            color: white !important;
            padding: 10px 20px;
            border-radius: 50px;
            transition: 0.3s;
        }

        .btn-nav:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }

        /* HERO SECTION */
        header.hero {
            background: linear-gradient(135deg, #f0f8ff 0%, #e6f2ff 100%);
            padding: 100px 5%;
            text-align: center;
            flex: 1; /* Pousse le footer vers le bas si peu de contenu */
        }

        h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            color: #1a1a1a;
        }

        .subtitle {
            font-size: 1.25rem;
            color: #666;
            max-width: 700px;
            margin: 0 auto 40px auto;
        }

        .btn-cta {
            display: inline-block;
            background: var(--primary);
            color: white;
            font-size: 1.2rem;
            font-weight: bold;
            padding: 18px 40px;
            border-radius: 50px;
            text-decoration: none;
            box-shadow: 0 10px 20px rgba(0,123,255,0.2);
            transition: 0.3s;
        }

        .btn-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 15px 30px rgba(0,123,255,0.3);
        }

        /* FEATURES GRID */
        .features {
            padding: 80px 5%;
            background: white;
            text-align: center;
        }

        .section-title {
            font-size: 2rem;
            margin-bottom: 60px;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 40px;
        }

        .card {
            background: white;
            padding: 30px;
            border-radius: 12px;
            border: 1px solid #eee;
            transition: 0.3s;
        }

        .card:hover {
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            transform: translateY(-5px);
            border-color: var(--primary);
        }

        .icon-box {
            width: 70px;
            height: 70px;
            background: #e6f2ff;
            color: var(--primary);
            font-size: 30px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px auto;
        }

        .card h3 { margin-bottom: 15px; }
        .card p { color: #666; font-size: 0.95rem; }

        /* PRIVACY / SECURITY */
        .privacy-section {
            background: var(--text);
            color: white;
            padding: 80px 5%;
            text-align: center;
        }
        
        .privacy-content {
            max-width: 800px;
            margin: 0 auto;
        }

        /* FOOTER BRANDED */
        footer {
            background: #111; /* Fond sombre pro */
            color: #aaa;
            padding: 50px 5% 30px 5%;
            text-align: center;
            border-top: 4px solid var(--primary);
        }

        .footer-logo {
            color: white;
            font-size: 1.2rem;
            font-weight: bold;
            margin-bottom: 10px;
            display: inline-block;
        }

        .footer-links {
            margin-bottom: 20px;
        }

        .footer-credits {
            font-size: 0.9rem;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid #333;
        }

        .oz-link {
            color: white;
            text-decoration: none;
            font-weight: 600;
            transition: color 0.2s;
        }

        .oz-link:hover {
            color: var(--primary);
            text-decoration: underline;
        }

        /* MOBILE */
        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            nav { flex-direction: column; gap: 15px; }
            .nav-links { margin-top: 10px; }
            .nav-links a { margin: 0 10px; }
        }