:root {
            --primary-dark: #0f172a;
            --accent-gold: #c5a059;
            --soft-white: #ffffff;
            --text-gray: #4b5563;
            --bg-light: #f8fafc;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Montserrat', sans-serif; color: var(--primary-dark); background: var(--soft-white); line-height: 1.6; }

        /* --- SEO HERO SECTION --- */
        .hero {
            height: 100vh;
            background: linear-gradient(rgba(15, 23, 42, 0.7), rgba(15, 23, 42, 0.7)), 
                        url('https://upbg103.myueeshop.com/tmp/photo/2601/20/980nmlaservascularremovalfacialscene.webp');
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: var(--soft-white);
        }

        .hero-content { max-width: 900px; padding: 0 20px; }
        .hero-tag { font-weight: 600; letter-spacing: 4px; text-transform: uppercase; color: var(--accent-gold); font-size: 0.9rem; margin-bottom: 20px; display: block; }
        .hero h1 { font-family: 'Playfair Display', serif; font-size: 4rem; line-height: 1.1; margin-bottom: 30px; }
        .hero p { font-size: 1.2rem; font-weight: 300; margin-bottom: 40px; opacity: 0.9; }

        .btn-luxe {
            padding: 18px 45px;
            background: var(--accent-gold);
            color: white;
            text-decoration: none;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 2px;
            transition: 0.4s ease;
            display: inline-block;
        }
        .btn-luxe:hover { background: #b38e47; transform: translateY(-3px); }

        /* --- SECTIONS --- */
        section { padding: 100px 10%; }
        .section-title { font-family: 'Playfair Display', serif; font-size: 2.8rem; margin-bottom: 50px; text-align: center; }
        .section-title span { color: var(--accent-gold); font-style: italic; }

        /* --- PRINCIPE DE FONCTIONNEMENT --- */
        .grid-principle { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
        .principle-image img { width: 100%; border-radius: 5px; box-shadow: 20px 20px 0px var(--bg-light); }
        .principle-text h3 { font-family: 'Playfair Display', serif; font-size: 2rem; margin-bottom: 20px; }

        /* --- PARAMÈTRES TECHNIQUES --- */
        .specs-table { width: 100%; border-collapse: collapse; margin-top: 30px; }
        .specs-table tr { border-bottom: 1px solid #e5e7eb; }
        .specs-table td { padding: 20px; font-size: 1rem; }
        .specs-table td:first-child { font-weight: 600; color: var(--accent-gold); text-transform: uppercase; width: 40%; }

        /* --- AVANT / APRÈS --- */
        .ba-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
        .ba-card { text-align: center; background: var(--bg-light); padding: 10px; }
        .ba-card img { width: 100%; margin-bottom: 15px; }
        .ba-card p { font-weight: 600; font-size: 0.9rem; }

        /* --- FAQ --- */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item { margin-bottom: 15px; border: 1px solid #eee; border-radius: 4px; }
        summary { padding: 20px; font-weight: 600; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
        summary::after { content: '+'; color: var(--accent-gold); font-size: 1.5rem; }
        details[open] summary::after { content: '-'; }
        details p { padding: 0 20px 20px; color: var(--text-gray); }

        /* --- FOOTER --- */
        footer { background: var(--primary-dark); color: white; padding: 80px 10% 40px; text-align: center; }
        
        @media (max-width: 768px) {
            .hero h1 { font-size: 2.5rem; }
            .grid-principle, .ba-grid { grid-template-columns: 1fr; }
        }