/* roulang page: index */
:root {
            --primary-dark: #0F172A;
            --accent-blue: #0284C7;
            --accent-gold: #D97706;
            --bg-light: #F8FAFC;
            --border-color: #E2E8F0;
        }
        body {
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: #F8FAFC;
            color: #334155;
            line-height: 1.75;
        }
        .tabular-nums {
            font-variant-numeric: tabular-nums;
        }
        .scroll-mt-header {
            scroll-margin-top: 88px;
        }
        .banner-slide {
            transition: opacity 0.8s ease-in-out;
        }
        .accordion-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
        }