/* roulang page: index */
:root {
            --primary: #0F766E;
            --primary-hover: #0D9488;
            --dark-section: #0A2524;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
            background-color: var(--bg-light);
            color: var(--text-body);
            line-height: 1.75;
        }

        .heading-tight {
            letter-spacing: -0.02em;
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, opacity 0.2s ease-out;
            opacity: 0;
        }

        .accordion-item.active .accordion-content {
            max-height: 280px;
            opacity: 1;
        }

        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }

        .custom-scrollbar::-webkit-scrollbar {
            height: 6px;
        }
        .custom-scrollbar::-webkit-scrollbar-thumb {
            background: #CBD5E1;
            border-radius: 9999px;
        }