/* roulang page: index */
:root {
            --primary: #FF5722;
            --secondary: #00E676;
            --text-dark: #1A1A1A;
            --text-gray: #666666;
            --bg-gray: #F5F5F5;
            --white: #FFFFFF;
            --radius: 16px;
            --shadow: 0 4px 12px rgba(0,0,0,0.05);
            --transition: all 0.3s ease;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--text-dark); line-height: 1.8; background: var(--white); }
        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 { padding: 20px 0; background: var(--white); border-bottom: 1px solid #eee; position: sticky; top: 0; z-index: 1000; }
        .nav-inner { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 24px; font-weight: 700; color: var(--primary); }
        .nav-links a { margin-left: 24px; font-weight: 500; color: var(--text-dark); }
        .nav-links a:hover { color: var(--primary); }

        /* Components */
        .btn { display: inline-block; padding: 12px 28px; border-radius: var(--radius); font-weight: 600; cursor: pointer; transition: var(--transition); border: none; }
        .btn-primary { background: var(--primary); color: var(--white); }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(255,87,34,0.3); }
        .section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 50px; }
        .section-title h2 { font-size: 36px; margin-bottom: 16px; }
        
        /* Hero */
        .hero { background: var(--text-dark); color: var(--white); padding: 100px 0; text-align: center; background-image: linear-gradient(rgba(26,26,26,0.8), rgba(26,26,26,0.8)), url('/assets/images/AI体育-NBA_足球_篮球_综合体育互动直播平台-AI体育官网.webp'); background-size: cover; background-position: center; }
        .hero h1 { font-size: 48px; margin-bottom: 24px; }
        .hero p { max-width: 600px; margin: 0 auto 32px; color: #ccc; }

        /* Grid Cards */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .card { padding: 30px; border-radius: var(--radius); background: var(--white); border: 1px solid #eee; transition: var(--transition); box-shadow: var(--shadow); }
        .card:hover { transform: translateY(-5px); box-shadow: 0 10px 24px rgba(0,0,0,0.1); }
        .card h3 { margin-bottom: 15px; font-size: 20px; }

        /* Countdown */
        .countdown-bar { background: var(--primary); color: var(--white); padding: 30px 0; text-align: center; }
        .countdown-item { font-size: 24px; font-weight: 700; }

        /* Footer */
        footer { background: var(--text-dark); color: #888; padding: 60px 0 20px; }
        .footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; margin-bottom: 40px; }
        .copyright { text-align: center; border-top: 1px solid #333; padding-top: 20px; }

        @media (max-width: 768px) {
            .grid-3 { grid-template-columns: 1fr; }
            .hero h1 { font-size: 32px; }
            .nav-links { display: none; }
        }