/* roulang page: index */
:root {
            --primary: #004D40;
            --accent: #2E7D32;
            --highlight: #FF9800;
            --text: #333333;
            --light-text: #666666;
            --bg: #ffffff;
            --gray-bg: #f8f9fa;
            --border: #e0e0e0;
            --radius: 12px;
            --shadow: 0 4px 6px rgba(0,0,0,0.05);
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', 'Helvetica Neue', Helvetica, Arial, sans-serif; line-height: 1.6; color: var(--text); background-color: var(--bg); }
        
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Nav */
        header { padding: 20px 0; background: rgba(255,255,255,0.95); position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid var(--border); }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 20px; font-weight: 700; color: var(--primary); text-decoration: none; }
        .nav-links { display: flex; gap: 30px; }
        .nav-links a { text-decoration: none; color: var(--text); font-weight: 500; font-size: 14px; transition: color 0.3s; }
        .nav-links a:hover { color: var(--accent); }
        .cta-btn { background: var(--highlight); color: white; padding: 8px 20px; border-radius: 20px; text-decoration: none; font-weight: 600; }

        /* Sections */
        section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 50px; }
        .section-title h2 { font-size: 36px; color: var(--primary); margin-bottom: 15px; }
        .section-title p { color: var(--light-text); max-width: 600px; margin: 0 auto; }

        /* Hero */
        .hero { background: linear-gradient(rgba(0,77,64,0.8), rgba(0,77,64,0.8)), url('/assets/images/backpic/back-1.png') center/cover; color: white; padding: 120px 0; text-align: center; }
        .hero h1 { font-size: 48px; margin-bottom: 20px; }
        .hero p { font-size: 18px; margin-bottom: 30px; opacity: 0.9; max-width: 800px; margin-left: auto; margin-right: auto; }

        /* Grid */
        .grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { padding: 30px; border: 1px solid var(--border); border-radius: var(--radius); transition: transform 0.3s, shadow 0.3s; }
        .card:hover { transform: translateY(-5px); border-color: var(--accent); }
        .card h3 { margin-bottom: 15px; color: var(--primary); }

        /* Footer */
        footer { background: #1a1a1a; color: #ccc; padding: 50px 0; text-align: center; font-size: 14px; }
        footer a { color: #fff; text-decoration: none; margin: 0 10px; }

        @media (max-width: 768px) {
            .nav-links { display: none; }
            .hero h1 { font-size: 32px; }
        }