/* roulang page: index */
:root {
            --primary-blue: #0A192F;
            --gold-accent: #FFD700;
            --silver-light: #E0E0E0;
            --text-dark: #333333;
            --text-gray: #666666;
            --bg-light: #F5F5F7;
            --white: #FFFFFF;
            --transition: all 0.3s ease;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; line-height: 1.6; color: var(--text-dark); background-color: var(--white); }
        
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Header & Nav */
        header { position: sticky; top: 0; z-index: 1000; background: var(--primary-blue); color: var(--white); padding: 15px 0; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 20px; font-weight: bold; color: var(--gold-accent); }
        .nav-links { display: flex; gap: 20px; }
        .nav-links a { color: var(--white); text-decoration: none; font-size: 14px; transition: var(--transition); }
        .nav-links a:hover { color: var(--gold-accent); }

        /* Hero Section */
        .hero { background: var(--primary-blue); color: var(--white); padding: 80px 0; text-align: center; background-image: linear-gradient(rgba(10,25,47,0.9), rgba(10,25,47,0.9)), url('/assets/images/backpic/back-1.jpg'); background-size: cover; background-position: center; }
        .hero h1 { font-size: 48px; margin-bottom: 20px; }
        .hero p { font-size: 18px; max-width: 800px; margin: 0 auto 30px; opacity: 0.9; }
        .btn-group { display: flex; gap: 15px; justify-content: center; }
        .btn { padding: 12px 30px; border-radius: 4px; font-weight: bold; text-decoration: none; cursor: pointer; transition: var(--transition); }
        .btn-primary { background: var(--gold-accent); color: var(--primary-blue); }
        .btn-secondary { background: transparent; border: 1px solid var(--white); color: var(--white); }
        .btn:hover { transform: translateY(-2px); opacity: 0.9; }

        /* Sections */
        section { padding: 80px 0; }
        .bg-gray { background-color: var(--bg-light); }
        .section-title { text-align: center; margin-bottom: 50px; }
        .section-title h2 { font-size: 32px; color: var(--primary-blue); margin-bottom: 10px; }

        /* Grid Components */
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: var(--white); padding: 30px; border-radius: 8px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); transition: var(--transition); }
        .card:hover { box-shadow: 0 10px 25px rgba(0,0,0,0.1); }
        .card img { width: 100%; height: 200px; object-fit: cover; border-radius: 4px; margin-bottom: 15px; }

        /* Stats Bar */
        .stats-bar { background: var(--primary-blue); color: var(--white); padding: 40px 0; text-align: center; display: flex; justify-content: space-around; }
        .stat-item h3 { font-size: 36px; color: var(--gold-accent); }

        /* Footer */
        footer { background: #000; color: #ccc; padding: 40px 0; text-align: center; font-size: 14px; }
        footer a { color: #fff; text-decoration: none; }

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