/* roulang page: index */
:root {
            --primary: #00F2FE;
            --secondary: #2D1B4E;
            --bg-dark: #0F0F12;
            --text-main: #FFFFFF;
            --text-muted: #A0A0A0;
            --border-color: #2D2D35;
            --radius-main: 12px;
            --shadow-glow: 0 0 20px rgba(0, 242, 254, 0.3);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Inter', 'Microsoft YaHei', sans-serif; background-color: var(--bg-dark); color: var(--text-main); line-height: 1.75; }
        
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Navigation */
        header { padding: 20px 0; border-bottom: 1px solid var(--border-color); background: rgba(15, 15, 18, 0.9); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 1000; }
        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: 30px; font-size: 0.95rem; transition: 0.3s; }
        .nav-links a:hover { color: var(--primary); }

        /* Hero Section */
        .hero { padding: 100px 0; display: flex; align-items: center; gap: 40px; background: linear-gradient(135deg, rgba(45, 27, 78, 0.5) 0%, rgba(15, 15, 18, 1) 100%); }
        .hero-content { flex: 5; }
        .hero-visual { flex: 7; position: relative; }
        .hero-visual img { width: 100%; border-radius: var(--radius-main); box-shadow: var(--shadow-glow); }
        h1 { font-size: 3.5rem; line-height: 1.2; margin-bottom: 20px; background: linear-gradient(90deg, #FFFFFF, var(--primary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .btn { display: inline-block; padding: 12px 30px; background: linear-gradient(90deg, var(--primary), #0077FF); color: #000; border-radius: 30px; font-weight: 600; text-decoration: none; transition: 0.3s; }
        .btn:hover { box-shadow: var(--shadow-glow); transform: translateY(-2px); }

        /* Sections */
        section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 60px; }
        .section-title h2 { font-size: 2.5rem; margin-bottom: 15px; }
        
        /* Grid Cards */
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: rgba(255, 255, 255, 0.03); border: 1px solid var(--border-color); padding: 30px; border-radius: var(--radius-main); transition: 0.3s; }
        .card:hover { border-color: var(--primary); transform: translateY(-10px); }
        .card h3 { color: var(--primary); margin-bottom: 15px; }

        /* Stats & Data */
        .stats-bar { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding: 40px; background: rgba(255,255,255,0.02); border-radius: 20px; text-align: center; }
        .stat-item { font-size: 2rem; font-weight: bold; color: var(--primary); }
        
        /* Footer */
        footer { padding: 40px 0; border-top: 1px solid var(--border-color); text-align: center; color: var(--text-muted); font-size: 0.9rem; }
        
        @media (max-width: 768px) {
            h1 { font-size: 2rem; }
            .hero { flex-direction: column; text-align: center; }
            .stats-bar { grid-template-columns: 1fr 1fr; }
        }