/* roulang page: index */
:root {
            --primary: #005C8A;
            --secondary: #00A389;
            --accent: #D96B27;
            --darkSlate: #0D1F2D;
            --text-main: #0F172A;
            --text-sub: #475569;
            --border-color: #E2E8F0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #F8FAFC;
        }
        .container-custom {
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .tab-panel {
            display: none;
            opacity: 0;
            transition: opacity 0.25s ease-in-out;
        }
        .tab-panel.active {
            display: block;
            opacity: 1;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
        }
        .faq-item.open .faq-answer {
            max-height: 500px;
            transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
        }