/* roulang page: index */
:root {
            --primary: #0F766E;
            --primary-hover: #115E59;
            --accent: #F97316;
            --night: #0F172A;
            --surface: #F8FAFC;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-line: #E2E8F0;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--text-body);
            background-color: var(--surface);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        h1, h2, h3, h4 {
            color: var(--text-main);
            line-height: 1.3;
        }
        .container-custom {
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        .section-padding {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        .card-custom {
            border-radius: 1rem;
            background: #ffffff;
            border: 1px solid var(--border-line);
            box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }
        .card-custom:hover {
            box-shadow: 0 12px 24px -6px rgba(15, 23, 42, 0.1);
            transform: translateY(-2px);
        }
        .scroll-mt-header {
            scroll-margin-top: 5.5rem;
        }