/* roulang page: index */
:root {
            --primary: #0F2438;
            --accent: #D97706;
            --bg-light: #F8FAFC;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
        }
        body {
            font-family: PingFang SC, "Hiragino Sans GB", "Microsoft YaHei", Inter, sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }
        .tabular-num {
            font-variant-numeric: tabular-nums;
        }
        .hero-overlay {
            background: linear-gradient(135deg, rgba(15, 36, 56, 0.94) 0%, rgba(15, 23, 42, 0.88) 100%);
        }
        .card-hover {
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
        }
        .accordion-content {
            transition: max-height 0.3s ease-out, opacity 0.25s ease-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-content.active {
            max-height: 240px;
            opacity: 1;
        }
        .accordion-icon {
            transition: transform 0.3s ease;
        }
        .accordion-icon.rotated {
            transform: rotate(180deg);
        }