/* roulang page: index */
:root {
            --primary: #0F172A;
            --accent: #10B981;
            --accent-hover: #059669;
            --secondary: #3B82F6;
            --bg-light: #F8FAFC;
            --border-color: #E2E8F0;
            --text-main: #0F172A;
            --text-muted: #64748B;
        }
        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
        }
        body {
            color: var(--text-main);
            background-color: #FFFFFF;
        }
        .hero-bg {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(11, 15, 25, 0.92)), url('/assets/images/985fe3d8dd18a483.jpg') center/cover no-repeat;
        }
        .section-alt {
            background-color: var(--bg-light);
        }
        .card-shadow {
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
            transition: all 0.3s ease;
        }
        .card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }
        .stat-num {
            font-variant-numeric: tabular-nums;
            letter-spacing: -0.03em;
        }
        details summary::-webkit-details-marker {
            display: none;
        }