/* roulang page: index */
:root {
            --primary: #00C853;
            --black: #121212;
            --white: #FFFFFF;
            --gray-100: #F5F5F5;
            --gray-200: #E0E0E0;
            --gray-800: #212121;
            --transition: all 0.3s ease;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; line-height: 1.6; color: var(--gray-800); background-color: var(--white); }
        
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Header */
        header { position: fixed; top: 0; width: 100%; z-index: 1000; background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); border-bottom: 1px solid var(--gray-200); padding: 15px 0; transition: var(--transition); }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-weight: 700; font-size: 1.5rem; color: var(--black); text-decoration: none; }
        .nav-links { display: flex; gap: 30px; list-style: none; }
        .nav-links a { text-decoration: none; color: var(--gray-800); font-weight: 500; font-size: 0.95rem; transition: var(--transition); }
        .nav-links a:hover { color: var(--primary); }
        .btn-primary { background: var(--primary); color: var(--white); padding: 10px 24px; border-radius: 4px; text-decoration: none; font-weight: 600; }

        /* Hero */
        .hero { padding: 160px 0 100px; background: linear-gradient(135deg, #1a1a1a 0%, #000 100%); color: white; text-align: center; }
        .hero h1 { font-size: 3.5rem; margin-bottom: 20px; line-height: 1.2; }
        .hero p { font-size: 1.25rem; color: #ccc; max-width: 700px; margin: 0 auto 40px; }

        /* Sections */
        section { padding: 80px 0; }
        .section-header { text-align: center; margin-bottom: 50px; }
        .section-header h2 { font-size: 2.5rem; margin-bottom: 15px; }
        
        /* Grids & Cards */
        .grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { padding: 30px; border: 1px solid var(--gray-200); border-radius: 4px; transition: var(--transition); }
        .card:hover { border-color: var(--primary); transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
        .card h3 { margin-bottom: 15px; color: var(--black); }

        /* Footer */
        footer { background: var(--black); color: #888; padding: 60px 0; text-align: center; }
        .footer-links { margin-bottom: 20px; }
        .footer-links a { color: #fff; margin: 0 15px; text-decoration: none; }

        /* Utilities */
        .text-center { text-align: center; }
        .bg-gray { background-color: var(--gray-100); }
        
        @media (max-width: 768px) {
            .nav-links { display: none; }
            .hero h1 { font-size: 2.2rem; }
        }