/* roulang page: index */
:root {
            --primary: #0D9488;
            --primary-hover: #0F766E;
            --secondary: #1E293B;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
        }
        body {
            font-family: Inter, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        .section-py {
            padding-top: 5.5rem;
            padding-bottom: 5.5rem;
        }
        @media (max-width: 768px) {
            .section-py {
                padding-top: 3.5rem;
                padding-bottom: 3.5rem;
            }
        }
        .hero-pattern {
            background-color: #0F172A;
            background-image: radial-gradient(rgba(13, 148, 136, 0.22) 1px, transparent 0);
            background-size: 24px 24px;
        }
        .card-subtle {
            transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            border: 1px solid rgba(226, 232, 240, 0.9);
        }
        .card-subtle:hover {
            transform: translateY(-4px);
            border-color: #0D9488;
            box-shadow: 0 16px 32px -8px rgba(13, 148, 136, 0.12);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-content.active {
            max-height: 300px;
        }