/* roulang page: index */
:root {
            --primary: #4B0082;
            --secondary: #00F5FF;
            --bg-dark: #050505;
            --bg-section: #121212;
            --text-main: #ffffff;
            --text-dim: #a0a0a0;
            --border-color: rgba(255, 255, 255, 0.1);
            --glass: rgba(255, 255, 255, 0.05);
            --radius: 12px;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, 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; }
        
        /* Nav */
        header { position: fixed; width: 100%; top: 0; z-index: 1000; background: rgba(5, 5, 5, 0.8); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border-color); }
        nav { display: flex; justify-content: space-between; align-items: center; height: 80px; }
        .logo { font-size: 20px; font-weight: 700; letter-spacing: -0.5px; color: var(--text-main); }
        .nav-links { display: flex; gap: 30px; }
        .nav-links a { color: var(--text-dim); text-decoration: none; font-size: 14px; transition: 0.3s; }
        .nav-links a:hover { color: var(--secondary); }
        
        /* Hero */
        .hero { min-height: 90vh; display: flex; align-items: center; padding-top: 80px; background: linear-gradient(rgba(5,5,5,0.7), rgba(5,5,5,0.7)), url('/assets/images/a775c792ba2c4eb9.webp') center/cover; }
        .hero-content { max-width: 800px; }
        h1 { font-size: 4rem; margin-bottom: 20px; line-height: 1.1; background: linear-gradient(to right, #fff, var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .btn { display: inline-block; padding: 15px 30px; border-radius: var(--radius); font-weight: 600; text-decoration: none; transition: 0.3s; cursor: pointer; }
        .btn-primary { background: linear-gradient(45deg, var(--primary), var(--secondary)); color: #fff; }
        .btn-primary:hover { filter: brightness(1.2); box-shadow: 0 0 20px rgba(0, 245, 255, 0.3); }

        /* Sections */
        section { padding: 100px 0; border-bottom: 1px solid var(--border-color); }
        h2 { font-size: 2.5rem; margin-bottom: 50px; text-align: center; }
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: var(--glass); padding: 30px; border-radius: var(--radius); border: 1px solid var(--border-color); transition: 0.3s; }
        .card:hover { border-color: var(--secondary); transform: translateY(-5px); }
        
        /* Footer */
        footer { padding: 50px 0; text-align: center; color: var(--text-dim); font-size: 14px; background: var(--bg-section); }
        
        /* Responsiveness */
        @media (max-width: 768px) {
            h1 { font-size: 2.5rem; }
            .nav-links { display: none; }
        }