/* roulang page: index */
:root {
            --primary: #0A192F;
            --accent: #D4AF37;
            --accent-dark: #C59B27;
            --bg-paper: #F8F9FA;
            --slate-dark: #0B0F19;
            --text-main: #0F172A;
            --text-sub: #334155;
            --text-muted: #64748B;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            color: var(--text-main);
            background-color: var(--bg-paper);
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            letter-spacing: 0.02em;
            line-height: 1.75;
        }
        .num-font {
            font-variant-numeric: tabular-nums;
            letter-spacing: -0.02em;
        }
        .hero-banner-bg {
            background-image: linear-gradient(135deg, rgba(10, 25, 47, 0.94) 0%, rgba(11, 15, 25, 0.92) 100%), url('/assets/images/b91686730a030854.png');
            background-size: cover;
            background-position: center;
        }
        .dark-section-bg {
            background-image: linear-gradient(180deg, rgba(11, 15, 25, 0.98) 0%, rgba(10, 25, 47, 0.96) 100%), url('/assets/images/91c256fcaa9ceb82.png');
            background-size: cover;
            background-position: center;
        }
        .badge-amber {
            background: rgba(212, 175, 55, 0.12);
            color: #D4AF37;
            border: 1px solid rgba(212, 175, 55, 0.35);
        }
        .card-custom {
            transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px -4px rgba(10, 25, 47, 0.12);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }
        .accordion-item.active .accordion-content {
            max-height: 240px;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }