/* roulang page: index */
:root {
            --bg-color: #0A0A0A;
            --text-main: #FFFFFF;
            --text-dim: #A1A1AA;
            --accent-cyan: #00F2FF;
            --accent-purple: #7B61FF;
            --card-bg: #161616;
            --border-color: #262626;
            --container-width: 1200px;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background-color: var(--bg-color); color: var(--text-main); line-height: 1.6; }
        
        .container { max-width: var(--container-width); margin: 0 auto; padding: 0 20px; }
        
        header { position: sticky; top: 0; z-index: 100; backdrop-filter: blur(10px); background: rgba(10, 10, 10, 0.8); border-bottom: 1px solid var(--border-color); padding: 15px 0; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 1.25rem; font-weight: bold; color: var(--accent-cyan); text-decoration: none; }
        .nav-links a { color: var(--text-main); text-decoration: none; font-size: 0.9rem; margin-left: 20px; transition: color 0.3s; }
        
        .hero { padding: 120px 0; background: linear-gradient(rgba(10,10,10,0.8), rgba(10,10,10,0.8)), url('/assets/images/d533a6fd10a3fb38.webp') no-repeat center center/cover; text-align: center; }
        .hero h1 { font-size: 3.5rem; margin-bottom: 20px; background: linear-gradient(to right, #00F2FF, #7B61FF); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .btn-primary { display: inline-block; padding: 15px 30px; background: var(--accent-cyan); color: #000; border-radius: 8px; font-weight: bold; text-decoration: none; margin-top: 30px; }
        
        .section { padding: 80px 0; border-bottom: 1px solid var(--border-color); }
        .section-title { font-size: 2.5rem; text-align: center; margin-bottom: 50px; }
        
        .grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: var(--card-bg); padding: 30px; border-radius: 12px; border: 1px solid var(--border-color); transition: transform 0.3s, border-color 0.3s; }
        .card:hover { border-color: var(--accent-cyan); transform: translateY(-5px); }
        
        .footer { padding: 40px 0; text-align: center; color: var(--text-dim); font-size: 0.85rem; }
        
        @media (max-width: 768px) {
            .hero h1 { font-size: 2rem; }
            .grid-3 { grid-template-columns: 1fr; }
        }