/* roulang page: index */
:root {
            --primary: #0052CC;
            --accent: #A8FF35;
            --text-dark: #1A1E26;
            --text-light: #FFFFFF;
            --bg-light: #FFFFFF;
            --bg-dark: #1A1E26;
            --gray-100: #F4F5F7;
            --radius: 12px;
            --shadow: 0 4px 12px rgba(0,0,0,0.05);
            --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(--text-dark); background-color: var(--bg-light); }

        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        header { padding: 20px 0; background: #fff; position: sticky; top: 0; z-index: 1000; box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
        .nav-wrapper { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 24px; font-weight: 700; color: var(--primary); text-decoration: none; }
        .nav-links a { text-decoration: none; color: var(--text-dark); font-weight: 500; margin-left: 30px; transition: var(--transition); }
        .nav-links a:hover { color: var(--primary); }

        .btn { display: inline-block; padding: 12px 30px; border-radius: 50px; text-decoration: none; font-weight: 600; transition: var(--transition); cursor: pointer; text-align: center; }
        .btn-primary { background: var(--primary); color: #fff; }
        .btn-primary:hover { transform: scale(1.05); background: #0043a8; }
        .btn-accent { background: var(--accent); color: var(--text-dark); }

        section { padding: 80px 0; }
        .section-title { font-size: 36px; margin-bottom: 40px; text-align: center; position: relative; }
        
        .hero { background: var(--bg-dark); color: #fff; padding: 100px 0; display: flex; align-items: center; min-height: 600px; position: relative; overflow: hidden; }
        .hero-content { z-index: 1; max-width: 600px; }
        .hero h1 { font-size: 52px; margin-bottom: 20px; line-height: 1.2; }
        .hero p { font-size: 18px; margin-bottom: 40px; color: #ccc; }

        .grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { padding: 30px; border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); transition: var(--transition); border: 1px solid #eee; }
        .card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.1); }
        
        .stats-bar { background: var(--primary); color: #fff; padding: 40px 0; text-align: center; display: flex; justify-content: space-around; }
        .stat-item h3 { font-size: 48px; }

        .footer { background: var(--bg-dark); color: #999; padding: 60px 0 20px; }
        .footer-links { display: flex; justify-content: space-between; margin-bottom: 40px; }
        
        @media (max-width: 768px) {
            .nav-links { display: none; }
            .hero h1 { font-size: 36px; }
        }