/* roulang page: index */
:root {
            --bg-color: #0a0a0a;
            --accent-color: #caff33;
            --text-main: #ffffff;
            --text-muted: #a0a0a0;
            --border-color: rgba(255, 255, 255, 0.1);
            --radius: 2px;
            --spacing-section: 120px;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { 
            background-color: var(--bg-color); 
            color: var(--text-main); 
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.6;
            font-size: 16px;
        }

        /* Layout */
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        section { padding: var(--spacing-section) 0; border-bottom: 1px solid var(--border-color); }
        
        /* Header */
        header { 
            position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
            background: rgba(10, 10, 10, 0.8); backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            padding: 20px 0;
        }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 20px; font-weight: bold; color: var(--accent-color); text-decoration: none; }
        .nav-links a { color: var(--text-main); text-decoration: none; margin-left: 30px; font-size: 14px; transition: color 0.3s; }
        .nav-links a:hover { color: var(--accent-color); }

        /* Hero */
        .hero { min-height: 80vh; display: flex; align-items: center; padding-top: 100px; background: url('/assets/images/backpic/back-1.jpg') no-repeat center/cover; position: relative; }
        .hero::before { content: ''; position: absolute; top:0; left:0; width:100%; height:100%; background: rgba(0,0,0,0.6); }
        .hero-content { position: relative; z-index: 1; max-width: 800px; }
        h1 { font-size: 64px; line-height: 1.1; margin-bottom: 20px; }
        .hero-p { font-size: 20px; color: var(--text-muted); margin-bottom: 40px; }
        .btn-main { background: var(--accent-color); color: #000; padding: 15px 30px; border-radius: var(--radius); text-decoration: none; font-weight: bold; display: inline-block; }

        /* Components */
        .grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .card { border: 1px solid var(--border-color); padding: 30px; transition: border-color 0.3s; }
        .card:hover { border-color: var(--accent-color); }
        .section-title { font-size: 36px; margin-bottom: 60px; text-align: center; }

        /* Stats */
        .stats-bar { display: flex; justify-content: space-around; padding: 40px 0; border: 1px solid var(--border-color); }
        .stat-item { text-align: center; }
        .stat-value { font-size: 48px; color: var(--accent-color); font-weight: bold; }

        /* Footer */
        footer { padding: 60px 0; text-align: center; color: var(--text-muted); font-size: 14px; }
        
        @media (max-width: 768px) {
            .grid { grid-template-columns: 1fr; }
            h1 { font-size: 40px; }
            .nav-links { display: none; }
        }