/* roulang page: index */
:root {
            --bg-dark: #050A15;
            --bg-card: rgba(255, 255, 255, 0.05);
            --primary: #00F2FF;
            --secondary: #7B2CBF;
            --text-main: #FFFFFF;
            --text-dim: #A0AEC0;
            --border: rgba(255, 255, 255, 0.1);
            --radius: 16px;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'PingFang SC', 'Microsoft YaHei', 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; }
        
        /* Navigation */
        header { position: sticky; top: 0; z-index: 1000; background: rgba(5, 10, 21, 0.8); backdrop-filter: blur(15px); border-bottom: 1px solid var(--border); padding: 15px 0; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 20px; font-weight: bold; color: var(--primary); text-decoration: none; }
        .nav-links { display: flex; gap: 24px; }
        .nav-links a { color: var(--text-main); text-decoration: none; font-size: 14px; transition: color 0.3s; }
        .nav-links a:hover { color: var(--primary); }

        /* Hero Section */
        .hero { padding: 100px 0; background: linear-gradient(rgba(5,10,21,0.8), rgba(5,10,21,0.8)), url('/assets/images/AI赋能加持_体育数据API携手人工智能会收获怎样的未来_---知乎.jpg') center/cover; text-align: center; }
        .hero h1 { font-size: 48px; margin-bottom: 20px; }
        .hero p { color: var(--text-dim); max-width: 600px; margin: 0 auto 30px; font-size: 18px; }
        .btn-primary { background: var(--primary); color: #000; padding: 12px 30px; border-radius: 50px; font-weight: bold; text-decoration: none; display: inline-block; transition: transform 0.3s, box-shadow 0.3s; }
        .btn-primary:hover { transform: scale(1.05); box-shadow: 0 0 20px rgba(0, 242, 255, 0.4); }

        /* Sections */
        section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 50px; }
        .section-title h2 { font-size: 36px; margin-bottom: 15px; }

        /* Grid Cards */
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: var(--bg-card); padding: 30px; border-radius: var(--radius); border: 1px solid var(--border); transition: 0.3s; }
        .card:hover { border-color: var(--primary); transform: translateY(-5px); }
        .card h3 { margin-bottom: 15px; color: var(--primary); }
        .card p { color: var(--text-dim); }

        /* Stats */
        .stats { display: flex; justify-content: space-around; background: var(--bg-card); padding: 40px; border-radius: var(--radius); margin-top: 40px; }
        .stat-item { text-align: center; }
        .stat-val { font-size: 32px; font-weight: bold; color: var(--primary); }

        /* Footer */
        footer { padding: 40px 0; border-top: 1px solid var(--border); text-align: center; color: var(--text-dim); font-size: 14px; }
        
        @media (max-width: 768px) {
            .nav-links { display: none; }
        }