/* roulang page: index */
:root {
            --primary: #1D4ED8;
            --primary-dark: #0F172A;
            --accent: #0284C7;
            --surface-bg: #F8FAFC;
            --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.04), 0 8px 10px -6px rgba(15, 23, 42, 0.02);
            --card-shadow-hover: 0 20px 30px -10px rgba(15, 23, 42, 0.08), 0 12px 16px -8px rgba(15, 23, 42, 0.04);
        }
        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
        }
        body {
            background-color: #FFFFFF;
            color: #334155;
            overflow-x: hidden;
        }
        .hero-clip {
            clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
        }
        @media (max-width: 768px) {
            .hero-clip {
                clip-path: none;
            }
        }
        .custom-shadow {
            box-shadow: var(--card-shadow);
        }
        .custom-shadow:hover {
            box-shadow: var(--card-shadow-hover);
        }
        .tab-btn.active {
            background-color: #1D4ED8;
            color: #FFFFFF;
            border-color: #1D4ED8;
        }