/* roulang page: index */
:root {
            --primary-blue: #0066FF;
            --accent-orange: #FF6600;
            --bg-dark: #1A1A1A;
            --bg-light: #F5F7FA;
            --text-main: #333333;
            --text-muted: #666666;
            --border-radius: 24px;
            --card-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --transition: all 0.3s ease;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; line-height: 1.6; color: var(--text-main); background: #fff; }
        
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Navigation */
        .header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); border-bottom: 1px solid #eee; }
        .nav { display: flex; justify-content: space-between; align-items: center; height: 80px; }
        .logo { font-size: 24px; font-weight: 800; color: var(--primary-blue); text-decoration: none; }
        .nav-links a { margin-left: 30px; text-decoration: none; color: var(--text-main); font-weight: 500; transition: var(--transition); }
        .nav-links a:hover { color: var(--primary-blue); }
        .cta-btn { background: linear-gradient(90deg, var(--primary-blue), #0052cc); color: #fff; padding: 12px 24px; border-radius: 50px; text-decoration: none; font-weight: 600; }

        /* Hero Section */
        .hero { position: relative; height: 80vh; display: flex; align-items: center; background: url('/assets/images/Data-Analytics-in-Sports-Game-Changing-Insight.jpg') center/cover no-repeat; }
        .hero::before { content: ''; position: absolute; inset: 0; background: rgba(0,0,0,0.6); }
        .hero-content { position: relative; z-index: 1; color: #fff; max-width: 800px; }
        .hero h1 { font-size: 64px; line-height: 1.2; margin-bottom: 20px; }
        .hero p { font-size: 20px; margin-bottom: 30px; opacity: 0.9; }

        /* Layout Blocks */
        section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 50px; }
        .section-title h2 { font-size: 40px; margin-bottom: 15px; }

        /* Cards */
        .card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: #fff; padding: 30px; border-radius: var(--border-radius); box-shadow: var(--card-shadow); transition: var(--transition); border: 1px solid #eee; }
        .card:hover { transform: translateY(-10px); border-color: var(--primary-blue); }

        /* Elements */
        .btn-gradient { background: linear-gradient(135deg, var(--primary-blue), var(--accent-orange)); color: #fff; padding: 15px 30px; border-radius: 12px; display: inline-block; text-decoration: none; font-weight: 600; }
        .badge { background: #eef5ff; color: var(--primary-blue); padding: 5px 12px; border-radius: 6px; font-weight: 700; font-family: monospace; }
        
        /* FAQ */
        .faq-item { border-bottom: 1px solid #eee; padding: 20px 0; cursor: pointer; }
        .faq-question { font-weight: 600; display: flex; justify-content: space-between; align-items: center; }

        /* Footer */
        .footer { background: var(--bg-dark); color: #999; padding: 60px 0; text-align: center; }
        .footer-links { margin-bottom: 20px; }
        .footer-links a { color: #fff; margin: 0 15px; text-decoration: none; }

        /* Responsive */
        @media (max-width: 768px) {
            .hero h1 { font-size: 40px; }
            .nav-links { display: none; }
        }