/* roulang page: index */
:root {
            --primary: #0F52BA;
            --secondary: #2563EB;
            --accent: #0284C7;
            --success: #10B981;
            --darkbg: #0B192C;
            --surface: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border-color: #E2E8F0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--surface);
            line-height: 1.6;
        }
        .hero-diagonal {
            clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
        }
        @media (max-width: 1024px) {
            .hero-diagonal {
                clip-path: none;
            }
        }
        .card-shadow {
            box-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-shadow:hover {
            box-shadow: 0 20px 25px -5px rgba(15, 82, 186, 0.1), 0 8px 10px -6px rgba(15, 82, 186, 0.08);
            transform: translateY(-4px);
        }
        details summary::-webkit-details-marker {
            display: none;
        }