/* roulang page: index */
:root {
            --primary: #0f172a;
            --accent: #f97316;
            --bg-light: #f8fafc;
            --text-dark: #1e293b;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --radius-lg: 20px;
            --radius-md: 14px;
            --radius-sm: 8px;
            --shadow-card: 0 4px 24px rgba(15, 23, 42, 0.06);
            --shadow-hover: 0 12px 40px rgba(15, 23, 42, 0.12);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { background: var(--bg-light); color: var(--text-dark); font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif; line-height: 1.7; }
        a { text-decoration: none; color: inherit; }
        img { max-width: 100%; height: auto; display: block; }
        .nav-tabs-scroll { scrollbar-width: none; -ms-overflow-style: none; }
        .nav-tabs-scroll::-webkit-scrollbar { display: none; }
        .hero-background { background-image: url('/assets/images/backpic/back-1.png'); background-size: cover; background-position: center; }
        .section-divider { height: 1px; background: linear-gradient(to right, transparent, var(--border-light), transparent); }
        .hover-lift { transition: transform 0.3s ease, box-shadow 0.3s ease; }
        .hover-lift:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
        .btn-focus:focus-visible { outline: 3px solid rgba(249, 115, 22, 0.4); outline-offset: 2px; }
        .card-image-wrapper { overflow: hidden; position: relative; }
        .card-image-wrapper img { transition: transform 0.5s ease; }
        .card-image-wrapper:hover img { transform: scale(1.05); }
        .category-pill { transition: all 0.3s ease; }
        .category-pill:hover { background: var(--accent); color: #fff; border-color: var(--accent); transform: translateY(-2px); }
        .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
        .faq-item.open .faq-answer { max-height: 500px; }
        .faq-item.open .faq-icon { transform: rotate(45deg); }
        .faq-icon { transition: transform 0.3s ease; }
        .hero-content { position: relative; z-index: 2; }
        .hero-background::before { content: ''; position: absolute; inset: 0; background: linear-gradient(120deg, rgba(15, 23, 42, 0.92) 0%, rgba(15, 23, 42, 0.75) 50%, rgba(15, 23, 42, 0.45) 100%); z-index: 1; }

/* roulang page: article */
:root {
        --primary: #f97316;
        --primary-dark: #ea580c;
        --primary-light: #fff7ed;
        --dark: #0f172a;
        --text: #334155;
        --text-light: #64748b;
        --bg: #f8fafc;
        --border: #e2e8f0;
        --radius: 1rem;
        --radius-sm: 0.5rem;
        --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
        --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.03);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body { font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }
    img { max-width: 100%; height: auto; display: block; }
    a { color: inherit; text-decoration: none; }
    button { cursor: pointer; }
    input:focus, button:focus { outline: none; }
    .nav-tabs-scroll::-webkit-scrollbar { height: 0; }
    .article-content { font-size: 1.05rem; line-height: 1.9; color: var(--text); }
    .article-content p { margin-bottom: 1.5rem; }
    .article-content h2 { font-size: 1.5rem; font-weight: 700; color: var(--dark); margin: 2rem 0 1rem; }
    .article-content h3 { font-size: 1.2rem; font-weight: 600; color: var(--dark); margin: 1.5rem 0 0.75rem; }
    .article-content ul { margin: 1rem 0 1.5rem; padding-left: 1.5rem; list-style: disc; }
    .article-content ol { margin: 1rem 0 1.5rem; padding-left: 1.5rem; list-style: decimal; }
    .article-content li { margin-bottom: 0.5rem; }
    .article-content a { color: var(--primary); border-bottom: 1px solid transparent; }
    .article-content a:hover { border-bottom-color: var(--primary); }
    .article-content blockquote { border-left: 4px solid var(--primary); background: var(--primary-light); padding: 1rem 1.5rem; margin: 1.5rem 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
    .article-content img { border-radius: var(--radius-sm); margin: 1.5rem 0; }
    .article-content strong { color: var(--dark); }
    .btn-focus:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible { outline: 3px solid rgba(249, 115, 22, 0.4); outline-offset: 2px; }
    .article-hero { background: linear-gradient(135deg, rgba(15, 23, 42, 0.94), rgba(15, 23, 42, 0.78)), url('/assets/images/backpic/back-2.png') center/cover no-repeat; }
    .faq-item { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 1.25rem 1.5rem; background: white; transition: box-shadow 0.3s; }
    .faq-item:hover { box-shadow: var(--shadow); }
    .faq-item summary { cursor: pointer; font-weight: 600; color: var(--dark); list-style: none; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: '+'; float: right; font-size: 1.25rem; color: var(--primary); transition: transform 0.3s; }
    .faq-item[open] summary::after { content: '−'; }
    .faq-item p { margin-top: 0.75rem; color: var(--text-light); font-size: 0.95rem; }
    .sidebar-card { border: 1px solid var(--border); border-radius: var(--radius); background: white; box-shadow: var(--shadow); transition: transform 0.3s, box-shadow 0.3s; }
    .sidebar-card:hover { box-shadow: var(--shadow-lg); }
    .news-list-item { padding: 0.85rem 0; border-bottom: 1px solid #f1f5f9; transition: background 0.2s; }
    .news-list-item:last-child { border-bottom: none; }
    .news-list-item:hover .news-list-title { color: var(--primary); }
    .news-list-title { transition: color 0.2s; }
    .recommend-card { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: white; transition: transform 0.3s, box-shadow 0.3s; }
    .recommend-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
    .recommend-card .thumb { overflow: hidden; }
    .recommend-card .thumb img { transition: transform 0.5s; }
    .recommend-card:hover .thumb img { transform: scale(1.06); }
    .cta-section { background: linear-gradient(135deg, #0f172a 0%, #1e293b 40%, rgba(249, 115, 22, 0.3) 100%); }
    .tag-chip { display: inline-flex; align-items: center; background: #f1f5f9; color: var(--text-light); font-size: 0.8rem; padding: 0.35rem 0.9rem; border-radius: 9999px; transition: all 0.2s; }
    .tag-chip:hover { background: var(--primary-light); color: var(--primary); border-color: rgba(249, 115, 22, 0.3); }

/* roulang page: category1 */
:root {
            --primary: #0f172a;
            --accent: #f97316;
            --accent-dark: #ea580c;
            --surface: #ffffff;
            --surface-muted: #f8fafc;
            --text-main: #0f172a;
            --text-body: #475569;
            --text-weak: #94a3b8;
            --border-light: #e2e8f0;
            --radius-md: 0.75rem;
            --radius-lg: 1rem;
            --radius-xl: 1.5rem;
            --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.05);
            --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.10);
            --section-gap: 5rem;
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--surface-muted);
            color: var(--text-main);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
        }

        .nav-tabs-scroll::-webkit-scrollbar {
            display: none;
        }
        .nav-tabs-scroll {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }

        .category-pill {
            white-space: nowrap;
            flex-shrink: 0;
            transition: all .25s ease;
        }
        .category-pill:hover {
            border-color: var(--accent);
            color: var(--accent);
        }
        .category-pill.active {
            background-color: var(--primary);
            color: #fff;
            border-color: transparent;
            font-weight: 600;
        }

        .btn-focus:focus-visible {
            outline: 3px solid rgba(249, 115, 22, 0.45);
            outline-offset: 2px;
        }

        .hero-banner {
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.65)), url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
        }

        .section-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid rgba(226, 232, 240, 0.7);
            box-shadow: var(--shadow-card);
            transition: transform .3s ease, box-shadow .3s ease;
        }
        .section-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .cover-img-wrap {
            overflow: hidden;
            border-radius: 0.75rem 0.75rem 0 0;
        }
        .cover-img-wrap img {
            transition: transform .5s ease;
        }
        .section-card:hover .cover-img-wrap img {
            transform: scale(1.04);
        }

        .info-card {
            background: var(--surface-muted);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            transition: all .3s ease;
        }
        .info-card:hover {
            border-color: var(--accent);
            background: #fffaf5;
        }

        .step-line {
            position: relative;
        }
        .step-line::before {
            content: '';
            position: absolute;
            left: 24px;
            top: 60px;
            bottom: 0;
            width: 2px;
            background: linear-gradient(to bottom, rgba(249, 115, 22, 0.4), rgba(249, 115, 22, 0.08));
            border-radius: 999px;
        }

        .faq-item {
            border: 1px solid var(--border-light);
            background: #fff;
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color .25s;
        }
        .faq-item.open {
            border-color: rgba(249, 115, 22, 0.4);
        }
        .faq-question {
            cursor: pointer;
        }
        .faq-icon {
            transition: transform .3s ease;
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }

        .newsletter-input {
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            border-radius: 999px;
            padding: 0.8rem 1.2rem;
            font-size: 0.9rem;
            outline: none;
            transition: border-color .3s;
        }
        .newsletter-input::placeholder {
            color: rgba(255, 255, 255, 0.55);
        }
        .newsletter-input:focus {
            border-color: var(--accent);
        }

        .mobile-menu {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
        }
        .mobile-menu.open {
            max-height: 420px;
        }

        @media (max-width: 1024px) {
            :root {
                --section-gap: 4rem;
            }
        }
        @media (max-width: 768px) {
            .step-line::before {
                left: 18px;
            }
        }
        @media (max-width: 520px) {
            :root {
                --section-gap: 3rem;
            }
            .hero-title {
                font-size: 2.2rem !important;
            }
        }