/* roulang page: index */
:root {
            --brand-primary: #0D766E;
            --brand-accent: #0284C7;
            --brand-warning: #D97706;
            --bg-base: #F8FAFC;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-base);
            color: #334155;
            line-height: 1.75;
        }
        .hero-overlay {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(13, 118, 110, 0.82) 100%);
        }
        .dark-pattern-bg {
            background-color: #0F172A;
            background-image: radial-gradient(rgba(13, 118, 110, 0.25) 1px, transparent 1px);
            background-size: 24px 24px;
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] .arrow-icon {
            transform: rotate(180deg);
        }