/* roulang page: index */
:root {
            --primary: #0B2545;
            --primary-hover: #133966;
            --accent: #10B981;
            --accent-hover: #059669;
            --slate: #8DA9C4;
            --bg-dark: #0F172A;
            --bg-light: #F8FAFC;
            --text-main: #1E293B;
            --text-muted: #64748B;
        }
        body {
            background-color: var(--bg-light);
            color: var(--text-main);
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            -webkit-font-smoothing: antialiased;
        }
        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(11, 37, 69, 0.94) 0%, rgba(15, 23, 42, 0.90) 100%);
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary svg {
            transform: rotate(180deg);
        }
        .card-shadow {
            box-shadow: 0 4px 20px -2px rgba(11, 37, 69, 0.05), 0 2px 6px -1px rgba(11, 37, 69, 0.03);
        }
        .card-shadow:hover {
            box-shadow: 0 12px 28px -4px rgba(11, 37, 69, 0.12), 0 4px 10px -2px rgba(11, 37, 69, 0.04);
        }