/* roulang page: index */
:root {
            --primary: #1e3a8a;
            --primary-accent: #2563eb;
            --highlight: #f59e0b;
            --bg-main: #f8fafc;
            --surface: #ffffff;
            --border-color: #e2e8f0;
        }
        body {
            background-color: var(--bg-main);
            color: #334155;
            -webkit-font-smoothing: antialiased;
        }
        .vs-card-left {
            background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
            border: 1px solid #e2e8f0;
        }
        .vs-card-right {
            background: linear-gradient(180deg, #ffffff 0%, #eff6ff 100%);
            border: 2px solid #2563eb;
        }
        .timeline-step::before {
            content: '';
            position: absolute;
            top: 24px;
            left: 20px;
            bottom: -24px;
            width: 2px;
            background: #cbd5e1;
        }
        .timeline-step:last-child::before {
            display: none;
        }

/* roulang page: article */
:root {
            --primary: #1e3a8a;
            --primary-accent: #2563eb;
            --highlight: #f59e0b;
            --bg-main: #f8fafc;
            --surface: #ffffff;
            --border-color: #e2e8f0;
        }
        body {
            background-color: var(--bg-main);
            color: #334155;
            -webkit-font-smoothing: antialiased;
        }
        .vs-card-left {
            background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
            border: 1px solid #e2e8f0;
        }
        .vs-card-right {
            background: linear-gradient(180deg, #ffffff 0%, #eff6ff 100%);
            border: 2px solid #2563eb;
        }
        .article-content h2 {
            font-size: 1.5rem;
            line-height: 2rem;
            font-weight: 700;
            color: #0f172a;
            margin-top: 2rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
        }
        .article-content h3 {
            font-size: 1.25rem;
            line-height: 1.75rem;
            font-weight: 600;
            color: #1e293b;
            margin-top: 1.5rem;
            margin-bottom: 0.75rem;
        }
        .article-content p {
            margin-bottom: 1.25rem;
            line-height: 1.85;
            color: #475569;
            font-size: 1.025rem;
        }
        .article-content blockquote {
            border-left: 4px solid #2563eb;
            background-color: #eff6ff;
            padding: 1rem 1.25rem;
            margin: 1.5rem 0;
            border-radius: 0 0.5rem 0.5rem 0;
            color: #1e40af;
            font-style: italic;
        }
        .article-content ul, .article-content ol {
            margin-bottom: 1.25rem;
            padding-left: 1.5rem;
            color: #475569;
        }
        .article-content ul {
            list-style-type: disc;
        }
        .article-content ol {
            list-style-type: decimal;
        }
        .article-content li {
            margin-bottom: 0.5rem;
            line-height: 1.7;
        }
        .article-content img {
            border-radius: 0.75rem;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            margin: 1.5rem auto;
            max-width: 100%;
            height: auto;
        }

/* roulang page: category1 */
:root {
            --primary: #1e3a8a;
            --primary-accent: #2563eb;
            --highlight: #f59e0b;
            --bg-main: #f8fafc;
            --surface: #ffffff;
            --border-color: #e2e8f0;
        }
        body {
            background-color: var(--bg-main);
            color: #334155;
            -webkit-font-smoothing: antialiased;
        }
        .vs-card-left {
            background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
            border: 1px solid #e2e8f0;
        }
        .vs-card-right {
            background: linear-gradient(180deg, #ffffff 0%, #eff6ff 100%);
            border: 2px solid #2563eb;
        }