/* roulang page: index */
:root {
            --primary: #FF4500;
            --bg: #1A1A1A;
            --surface: #252525;
            --text-main: #FFFFFF;
            --text-muted: #E0E0E0;
            --border: #333333;
            --radius: 4px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif; background-color: var(--bg); color: var(--text-main); line-height: 1.6; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Nav */
        header { padding: 20px 0; border-bottom: 1px solid var(--border); position: sticky; top: 0; background: rgba(26, 26, 26, 0.95); z-index: 1000; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 24px; font-weight: 800; color: var(--primary); text-decoration: none; }
        .nav-links { display: flex; gap: 20px; list-style: none; }
        .nav-links a { color: var(--text-muted); text-decoration: none; font-size: 14px; transition: color 0.3s; }
        .nav-links a:hover { color: var(--primary); }
        .cta-header { background: var(--primary); color: #fff; padding: 8px 20px; border-radius: var(--radius); text-decoration: none; font-weight: bold; }

        /* Hero */
        .hero { padding: 80px 0; display: flex; align-items: center; gap: 40px; }
        .hero-content { flex: 1; }
        .hero-content h1 { font-size: 56px; margin-bottom: 20px; line-height: 1.1; }
        .hero-content p { font-size: 18px; color: var(--text-muted); margin-bottom: 30px; }
        .hero-visual { flex: 1; }
        .hero-visual img { width: 100%; border-radius: var(--radius); }

        /* Sections */
        section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 50px; }
        .section-title h2 { font-size: 40px; margin-bottom: 15px; }
        
        /* Cards */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .card { background: var(--surface); padding: 30px; border: 1px solid var(--border); border-radius: var(--radius); transition: transform 0.3s, border-color 0.3s; }
        .card:hover { border-color: var(--primary); }
        .card h3 { margin-bottom: 15px; color: var(--primary); }

        /* Components */
        .btn-main { background: var(--primary); color: #fff; padding: 15px 30px; border: none; border-radius: var(--radius); cursor: pointer; font-size: 16px; font-weight: bold; display: inline-block; text-decoration: none; transition: background 0.3s; }
        .btn-main:hover { background: #e03d00; }
        .stats { display: flex; justify-content: space-around; background: var(--surface); padding: 40px; border-radius: var(--radius); }
        .stat-item { text-align: center; }
        .stat-val { font-size: 36px; font-weight: 800; color: var(--primary); display: block; }

        /* Footer */
        footer { padding: 40px 0; border-top: 1px solid var(--border); text-align: center; font-size: 14px; color: var(--text-muted); }

        @media (max-width: 768px) {
            .grid-3 { grid-template-columns: 1fr; }
            .hero { flex-direction: column; text-align: center; }
            .hero-content h1 { font-size: 36px; }
        }