/* roulang page: index */
:root {
            --color-pine: #0E5359;
            --color-pine-dark: #0A3B40;
            --color-bamboo: #147E84;
            --color-amber: #D97706;
            --color-ink-bg: #0A1C20;
            --color-body-bg: #F8FAFC;
            --color-text-main: #0F172A;
            --color-text-body: #334155;
            --color-text-muted: #64748B;
        }

        body {
            background-color: var(--color-body-bg);
            color: var(--color-text-body);
            font-family: system-ui, -apple-system, "PingFang SC", "Lantinghei SC", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }

        .hero-slide {
            transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .accordion-content {
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.35s ease;
        }

        .metric-glow {
            text-shadow: 0 0 20px rgba(20, 126, 132, 0.25);
        }

        .card-custom {
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }

        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 32px -8px rgba(14, 83, 89, 0.12);
        }

        /* 修复手风琴展开平滑度 */
        .faq-item.active .faq-chevron {
            transform: rotate(180deg);
        }
        .faq-item.active .faq-body {
            display: block;
        }