/* roulang page: index */
:root {
            --primary: #00F2FF;
            --secondary: #2D1B4E;
            --bg-dark: #0B0E14;
            --bg-card: #1A1F29;
            --text-main: #FFFFFF;
            --text-dim: #A0AEC0;
            --accent-glow: 0 0 15px rgba(0, 242, 255, 0.3);
            --radius: 12px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Inter', 'PingFang SC', sans-serif; background-color: var(--bg-dark); color: var(--text-main); line-height: 1.6; }
        
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Header */
        header { position: sticky; top: 0; z-index: 1000; background: rgba(11, 14, 20, 0.9); backdrop-filter: blur(10px); border-bottom: 1px solid #2D3748; padding: 15px 0; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 1.5rem; font-weight: 800; color: var(--primary); text-decoration: none; }
        .nav-links a { color: var(--text-main); text-decoration: none; margin-left: 25px; font-size: 0.9rem; transition: var(--transition); }
        .nav-links a:hover { color: var(--primary); }

        /* Hero */
        .hero { padding: 100px 0; text-align: center; background: radial-gradient(circle at center, #2D1B4E 0%, #0B0E14 70%); }
        .hero h1 { font-size: 3.5rem; margin-bottom: 20px; line-height: 1.2; background: linear-gradient(to right, #fff, #00F2FF); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .hero p { max-width: 700px; margin: 0 auto 30px; color: var(--text-dim); font-size: 1.1rem; }
        .btn { display: inline-block; padding: 12px 30px; border-radius: var(--radius); background: var(--primary); color: var(--bg-dark); font-weight: 700; text-decoration: none; transition: var(--transition); box-shadow: var(--accent-glow); }
        .btn:hover { transform: translateY(-2px); filter: brightness(1.1); }

        /* Sections */
        section { padding: 80px 0; }
        .sec-title { text-align: center; margin-bottom: 50px; }
        .sec-title h2 { font-size: 2.2rem; margin-bottom: 15px; }
        
        .grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: var(--bg-card); padding: 30px; border-radius: var(--radius); border: 1px solid #2D3748; transition: var(--transition); }
        .card:hover { border-color: var(--primary); box-shadow: var(--accent-glow); }
        .card h3 { margin-bottom: 15px; color: var(--primary); }
        
        /* Specific Styles */
        .img-fluid { width: 100%; height: auto; border-radius: var(--radius); }
        .bg-alt { background: #11151d; }
        
        /* Footer */
        footer { padding: 50px 0; border-top: 1px solid #2D3748; text-align: center; color: var(--text-dim); font-size: 0.85rem; }
        .footer-links { margin-bottom: 20px; }
        .footer-links a { color: var(--text-dim); text-decoration: none; margin: 0 10px; }

        @media (max-width: 768px) {
            .hero h1 { font-size: 2.5rem; }
            .nav-links { display: none; }
        }