/* roulang page: index */
:root {
            --primary: #1D4ED8;
            --primary-dark: #1E40AF;
            --accent: #06B6D4;
            --accent-orange: #F97316;
            --text-dark: #0F172A;
            --text-mid: #334155;
            --text-light: #64748B;
            --bg-light: #F8FAFC;
        }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-mid);
            line-height: 1.75;
            background-color: #FFFFFF;
        }
        .text-navy { color: var(--text-dark); }
        .hero-blackgold {
            background: linear-gradient(135deg, #0B0F19 0%, #172033 60%, #1E1B18 100%);
            border-bottom: 2px solid #D97706;
        }
        .gold-border { border-color: rgba(217, 119, 6, 0.4); }
        .gold-badge {
            background: linear-gradient(90deg, #F59E0B 0%, #D97706 100%);
            color: #FFFFFF;
        }
        .trans-all { transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
        .nav-fixed-top { position: sticky; top: 0; z-index: 50; }
        .accordion-content { transition: max-height 0.35s ease-out, opacity 0.3s ease; }