/* roulang page: index */
:root {
            --bg-color: #121212;
            --text-main: #E0E0E0;
            --text-muted: #A0A0A0;
            --primary: #00F2FF;
            --secondary: #2979FF;
            --card-bg: #1A1A1A;
            --border: #333333;
            --shadow: 0 4px 20px rgba(0,0,0,0.3);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'PingFang SC', 'Inter', sans-serif; background-color: var(--bg-color); color: var(--text-main); line-height: 1.7; }
        
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        ul { list-style: none; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Header */
        header { position: sticky; top: 0; z-index: 1000; background: rgba(18, 18, 18, 0.9); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
        .nav-inner { display: flex; justify-content: space-between; align-items: center; height: 80px; }
        .logo { font-size: 24px; font-weight: bold; color: var(--primary); }
        .nav-links { display: flex; gap: 30px; }
        .nav-links a { color: var(--text-main); font-size: 14px; font-weight: 500; }
        .nav-links a:hover { color: var(--primary); }
        .cta-btn { background: linear-gradient(90deg, var(--primary), var(--secondary)); padding: 10px 24px; border-radius: 4px; color: #000; font-weight: 600; }

        /* Hero */
        .hero { padding: 100px 0; display: flex; align-items: center; gap: 40px; min-height: 60vh; }
        .hero-content { flex: 5; }
        .hero-image { flex: 7; border-radius: 8px; overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--border); }
        .hero-image img { width: 100%; height: auto; display: block; object-fit: cover; }
        .hero-title { font-size: 48px; line-height: 1.2; margin-bottom: 20px; background: linear-gradient(to right, #fff, var(--primary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .hero-desc { font-size: 18px; color: var(--text-muted); margin-bottom: 30px; }

        /* Section */
        section { padding: 80px 0; }
        .section-header { text-align: center; margin-bottom: 60px; }
        .section-header h2 { font-size: 36px; margin-bottom: 15px; }
        .section-header p { color: var(--text-muted); max-width: 600px; margin: 0 auto; }

        /* Grid & Cards */
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: var(--card-bg); padding: 30px; border-radius: 8px; border: 1px solid var(--border); transition: var(--transition); }
        .card:hover { transform: translateY(-5px); border-color: var(--primary); box-shadow: var(--shadow); }
        .card h3 { font-size: 20px; margin-bottom: 15px; color: #fff; }
        .card p { color: var(--text-muted); font-size: 14px; }

        /* Stats */
        .stats-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; background: #000; padding: 40px; border-radius: 8px; margin: 40px 0; }
        .stat-item { text-align: center; }
        .stat-value { font-size: 32px; font-weight: 700; color: var(--primary); display: block; }
        .stat-label { font-size: 14px; color: var(--text-muted); }

        /* Footer */
        footer { padding: 60px 0; border-top: 1px solid var(--border); background: #0a0a0a; text-align: center; color: var(--text-muted); font-size: 14px; }
        
        @media (max-width: 768px) {
            .hero { flex-direction: column; text-align: center; padding: 50px 0; }
            .nav-links { display: none; }
            .stats-bar { grid-template-columns: 1fr 1fr; }
        }