/* roulang page: index */
:root {
            --primary-color: #FF6B00; /* 运动橙 */
            --dark-color: #1A1A1A;    /* 科技黑 */
            --text-color: #333333;    /* 深灰文字 */
            --light-bg: #F9F9F9;      /* 浅灰背景 */
            --white: #FFFFFF;
            --border-radius: 8px;
            --container-width: 1200px;
            --transition: all 0.3s ease;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; line-height: 1.6; color: var(--text-color); background-color: var(--white); }
        
        /* 基础布局 */
        .container { max-width: var(--container-width); margin: 0 auto; padding: 0 20px; }
        section { padding: 80px 0; }
        h1, h2, h3 { color: var(--dark-color); line-height: 1.2; }
        
        /* 导航 */
        header { position: sticky; top: 0; background: var(--white); z-index: 1000; box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
        .nav-inner { display: flex; justify-content: space-between; align-items: center; padding: 15px 0; height: 70px; }
        .logo { font-size: 24px; font-weight: 800; color: var(--primary-color); text-decoration: none; }
        .nav-links a { margin-left: 30px; text-decoration: none; color: var(--text-color); font-weight: 500; }
        .nav-links a:hover { color: var(--primary-color); }
        
        /* Hero区 */
        .hero { background: var(--dark-color); color: var(--white); padding: 120px 0; text-align: center; }
        .hero h1 { font-size: 3.5rem; color: var(--white); margin-bottom: 20px; }
        .hero p { font-size: 1.2rem; margin-bottom: 40px; opacity: 0.9; max-width: 800px; margin-left: auto; margin-right: auto; }
        .btn { display: inline-block; padding: 15px 35px; background: var(--primary-color); color: var(--white); border-radius: var(--border-radius); text-decoration: none; font-weight: 600; transition: var(--transition); }
        .btn:hover { background: #e66000; transform: translateY(-2px); }

        /* 内容板块样式 */
        .section-title { text-align: center; margin-bottom: 50px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .card { padding: 30px; background: var(--white); border-radius: var(--border-radius); box-shadow: 0 4px 15px rgba(0,0,0,0.05); border: 1px solid #eee; transition: var(--transition); }
        .card:hover { box-shadow: 0 10px 25px rgba(0,0,0,0.1); }
        
        /* 特定区块优化 */
        .bg-light { background: var(--light-bg); }
        .news-item { border-bottom: 1px solid #ddd; padding: 20px 0; }
        
        /* Footer */
        footer { background: var(--dark-color); color: #ccc; padding: 50px 0; text-align: center; }
        .footer-links { margin-bottom: 20px; }
        
        @media (max-width: 768px) {
            .hero h1 { font-size: 2.5rem; }
            .grid-3 { grid-template-columns: 1fr; }
            .nav-links { display: none; }
        }