/* roulang page: index */
:root {
            --primary: #0F2942;
            --accent: #10B981;
            --highlight: #FF6B35;
            --bg-light: #FFFFFF;
            --bg-gray: #F8FAFC;
            --bg-dark: #0B192C;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-weak: #64748B;
            --border: #E2E8F0;
            --radius: 12px;
            --shadow: 0 4px 20px -2px rgba(15, 41, 66, 0.05);
            --transition: all 0.3s ease;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: "PingFang SC", "Microsoft YaHei", sans-serif; color: var(--text-body); line-height: 1.7; background: var(--bg-light); }
        h1, h2, h3 { color: var(--text-main); line-height: 1.3; }
        
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .btn { display: inline-flex; align-items: center; padding: 12px 24px; border-radius: 8px; font-weight: 600; text-decoration: none; transition: var(--transition); cursor: pointer; border: none; }
        .btn-primary { background: var(--accent); color: #fff; }
        .btn-primary:hover { background: #059669; }
        .btn-outline { border: 1px solid var(--border); color: var(--text-main); }
        .btn-outline:hover { background: var(--bg-gray); }

        header { position: sticky; top: 0; z-index: 1000; background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); padding: 15px 0; }
        .nav-inner { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 20px; font-weight: bold; color: var(--primary); text-decoration: none; }
        nav a { margin-left: 24px; text-decoration: none; color: var(--text-main); font-weight: 500; font-size: 14px; }
        nav a:hover { color: var(--accent); }

        #hero { padding: 80px 0; background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%); text-align: center; }
        #hero h1 { font-size: 3rem; margin-bottom: 20px; }
        .hero-desc { max-width: 700px; margin: 0 auto 30px; font-size: 1.1rem; color: var(--text-weak); }

        .section { padding: 80px 0; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .card { padding: 30px; border-radius: var(--radius); background: #fff; border: 1px solid var(--border); transition: var(--transition); }
        .card:hover { box-shadow: var(--shadow); transform: translateY(-5px); }

        .stats-bar { background: var(--primary); color: #fff; padding: 40px 0; }
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); text-align: center; }
        .stat-item { border-right: 1px solid rgba(255,255,255,0.1); }
        .stat-item:last-child { border: none; }
        .stat-num { font-size: 2.5rem; font-weight: bold; color: var(--accent); display: block; }
        
        footer { background: var(--primary); color: #94a3b8; padding: 60px 0 20px; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-title { color: #fff; margin-bottom: 15px; font-size: 16px; }

        @media (max-width: 768px) {
            .grid-3 { grid-template-columns: 1fr; }
            .hero-btns { flex-direction: column; gap: 10px; }
            #hero h1 { font-size: 2rem; }
            .footer-grid { grid-template-columns: 1fr; }
        }