/* roulang page: index */
:root {
            --primary: #0A192F;
            --accent: #FF6B35;
            --cyan: #00D2D3;
            --bg-light: #F8F9FA;
            --white: #FFFFFF;
            --text-dark: #333333;
            --text-gray: #666666;
            --border: #E1E4E8;
            --radius: 8px;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; line-height: 1.6; color: var(--text-dark); background: var(--white); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Header */
        header { position: sticky; top: 0; z-index: 1000; background: var(--white); border-bottom: 1px solid var(--border); transition: 0.3s; }
        .top-bar { font-size: 12px; padding: 5px 0; background: var(--primary); color: var(--white); text-align: right; }
        .nav-main { display: flex; align-items: center; justify-content: space-between; height: 70px; }
        .logo { font-size: 20px; font-weight: bold; color: var(--primary); text-decoration: none; }
        .nav-menu { display: flex; gap: 24px; list-style: none; }
        .nav-menu a { text-decoration: none; color: var(--text-dark); font-weight: 500; font-size: 14px; transition: 0.3s; }
        .nav-menu a:hover { color: var(--accent); }
        .btn-cta { background: var(--accent); color: var(--white); padding: 8px 20px; border-radius: var(--radius); text-decoration: none; font-size: 14px; }

        /* Hero */
        .hero { height: 80vh; background: var(--primary); color: var(--white); display: flex; align-items: center; position: relative; overflow: hidden; }
        .hero-bg { position: absolute; width: 100%; height: 100%; object-fit: cover; opacity: 0.3; }
        .hero-content { position: relative; z-index: 2; max-width: 600px; }
        .hero h1 { font-size: 48px; margin-bottom: 20px; line-height: 1.2; }
        .hero p { font-size: 18px; margin-bottom: 30px; opacity: 0.9; }
        .btn-hero { display: inline-block; padding: 15px 30px; background: var(--accent); color: white; border-radius: var(--radius); text-decoration: none; font-weight: bold; }

        /* Section Global */
        section { padding: 80px 0; }
        .sec-title { text-align: center; font-size: 32px; margin-bottom: 50px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .card { padding: 30px; border-radius: 12px; background: var(--white); border: 1px solid var(--border); transition: 0.3s; }
        .card:hover { transform: translateY(-10px); box-shadow: 0 10px 30px rgba(0,0,0,0.1); }

        /* Stats */
        .stats-bar { background: var(--primary); color: var(--white); padding: 40px 0; text-align: center; }
        .stat-item { font-size: 24px; font-weight: bold; color: var(--accent); }

        /* Responsive */
        @media (max-width: 768px) {
            .grid-3 { grid-template-columns: 1fr; }
            .nav-menu { display: none; }
            .hero h1 { font-size: 32px; }
        }

        footer { background: var(--primary); color: #fff; padding: 40px 0; text-align: center; font-size: 14px; }
        .footer-links { margin-bottom: 20px; }
        .footer-links a { color: #ccc; margin: 0 10px; text-decoration: none; }