/* roulang page: index */
/* === 设计变量 === */
    :root {
        --primary: #0f2a3d;
        --primary-light: #1a3f57;
        --secondary: #2a7a8a;
        --accent: #3d9a8a;
        --accent-light: #5ab8a8;
        --bg: #f0f4f8;
        --bg-card: #ffffff;
        --bg-dark: #0a1a28;
        --text: #1a2a3a;
        --text-light: #5a6a7a;
        --text-muted: #8a9aaa;
        --border: #dce4ec;
        --radius: 12px;
        --radius-sm: 8px;
        --radius-lg: 20px;
        --shadow: 0 4px 20px rgba(10, 30, 50, 0.08);
        --shadow-hover: 0 12px 40px rgba(10, 30, 50, 0.15);
        --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        --max-width: 1200px;
        --header-height: 72px;
    }

    /* === Reset / 基础 === */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
    body {
        font-family: var(--font-family);
        background: var(--bg);
        color: var(--text);
        line-height: 1.6;
        font-size: 16px;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { color: var(--secondary); text-decoration: none; transition: var(--transition); }
    a:hover { color: var(--accent); }
    a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
    button { cursor: pointer; font-family: inherit; border: none; background: none; }
    input, textarea { font-family: inherit; font-size: 1rem; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--primary); }
    h1 { font-size: 2.75rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.375rem; }
    h4 { font-size: 1.125rem; }
    p { margin-bottom: 1rem; }
    .container {
        max-width: var(--max-width);
        margin: 0 auto;
        padding: 0 24px;
    }
    .section { padding: 80px 0; }
    .section-title {
        text-align: center;
        margin-bottom: 16px;
        font-size: 2rem;
        color: var(--primary);
    }
    .section-subtitle {
        text-align: center;
        color: var(--text-light);
        font-size: 1.125rem;
        max-width: 640px;
        margin: 0 auto 48px auto;
    }
    .section-divider {
        width: 60px;
        height: 4px;
        background: linear-gradient(90deg, var(--secondary), var(--accent));
        border-radius: 4px;
        margin: 12px auto 20px auto;
    }

    /* === 按钮 === */
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        padding: 14px 32px;
        border-radius: var(--radius-sm);
        font-weight: 600;
        font-size: 1rem;
        transition: var(--transition);
        border: 2px solid transparent;
        white-space: nowrap;
    }
    .btn-primary {
        background: var(--secondary);
        color: #fff;
        border-color: var(--secondary);
    }
    .btn-primary:hover {
        background: var(--accent);
        border-color: var(--accent);
        color: #fff;
        transform: translateY(-2px);
        box-shadow: 0 8px 24px rgba(42, 122, 138, 0.35);
    }
    .btn-primary:active { transform: translateY(0); box-shadow: 0 4px 12px rgba(42, 122, 138, 0.25); }
    .btn-outline {
        background: transparent;
        color: var(--secondary);
        border-color: var(--secondary);
    }
    .btn-outline:hover {
        background: var(--secondary);
        color: #fff;
        transform: translateY(-2px);
        box-shadow: 0 8px 24px rgba(42, 122, 138, 0.2);
    }
    .btn-outline:active { transform: translateY(0); }
    .btn-lg { padding: 18px 40px; font-size: 1.125rem; border-radius: var(--radius); }
    .btn-block { width: 100%; justify-content: center; }

    /* === Header / 导航 (桌面) === */
    .site-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        background: rgba(255, 255, 255, 0.96);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border-bottom: 1px solid var(--border);
        height: var(--header-height);
        transition: var(--transition);
    }
    .site-header .container {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 100%;
    }
    .logo {
        font-size: 1.5rem;
        font-weight: 800;
        color: var(--primary);
        letter-spacing: -0.5px;
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .logo i { color: var(--secondary); font-size: 1.75rem; }
    .logo span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
    .logo:hover span { -webkit-text-fill-color: var(--secondary); }
    .nav-desktop { display: flex; align-items: center; gap: 8px; }
    .nav-desktop a {
        padding: 8px 18px;
        border-radius: var(--radius-sm);
        font-weight: 500;
        color: var(--text);
        font-size: 0.95rem;
        position: relative;
        transition: var(--transition);
    }
    .nav-desktop a:hover { background: rgba(42, 122, 138, 0.08); color: var(--secondary); }
    .nav-desktop a.active {
        background: var(--secondary);
        color: #fff;
    }
    .nav-desktop a.active:hover { background: var(--accent); color: #fff; }
    .nav-toggle { display: none; font-size: 1.5rem; color: var(--primary); padding: 8px; }

    /* === 移动端底部 Tab 导航 === */
    .bottom-tab-nav {
        display: none;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 1001;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-top: 1px solid var(--border);
        padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
        box-shadow: 0 -4px 20px rgba(10, 30, 50, 0.06);
    }
    .bottom-tab-nav .tab-list {
        display: flex;
        justify-content: space-around;
        align-items: center;
        max-width: 480px;
        margin: 0 auto;
    }
    .bottom-tab-nav .tab-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 2px;
        padding: 6px 12px;
        border-radius: var(--radius-sm);
        color: var(--text-light);
        font-size: 0.7rem;
        font-weight: 500;
        transition: var(--transition);
        min-width: 64px;
    }
    .bottom-tab-nav .tab-item i { font-size: 1.25rem; transition: var(--transition); }
    .bottom-tab-nav .tab-item:hover { color: var(--secondary); background: rgba(42, 122, 138, 0.06); }
    .bottom-tab-nav .tab-item.active { color: var(--secondary); }
    .bottom-tab-nav .tab-item.active i { color: var(--secondary); }
    .bottom-tab-nav .tab-item span { line-height: 1.2; }

    /* === Hero 首屏 === */
    .hero {
        margin-top: var(--header-height);
        min-height: 88vh;
        display: flex;
        align-items: center;
        position: relative;
        background: linear-gradient(135deg, rgba(10, 30, 50, 0.85), rgba(26, 63, 87, 0.75)), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
        color: #fff;
        overflow: hidden;
    }
    .hero::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 120px;
        background: linear-gradient(to top, var(--bg), transparent);
    }
    .hero .container { position: relative; z-index: 2; width: 100%; }
    .hero-content { max-width: 720px; }
    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        background: rgba(255, 255, 255, 0.12);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
        padding: 8px 20px;
        border-radius: 40px;
        font-size: 0.85rem;
        font-weight: 500;
        color: rgba(255, 255, 255, 0.9);
        border: 1px solid rgba(255, 255, 255, 0.15);
        margin-bottom: 24px;
    }
    .hero-badge i { color: var(--accent-light); }
    .hero h1 {
        font-size: 3.25rem;
        font-weight: 800;
        color: #fff;
        line-height: 1.15;
        letter-spacing: -1px;
        margin-bottom: 20px;
    }
    .hero h1 span {
        background: linear-gradient(135deg, var(--accent-light), #8ad0c0);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .hero p {
        font-size: 1.2rem;
        color: rgba(255, 255, 255, 0.8);
        max-width: 580px;
        margin-bottom: 32px;
        line-height: 1.7;
    }
    .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
    .hero-actions .btn-primary {
        background: var(--accent);
        border-color: var(--accent);
    }
    .hero-actions .btn-primary:hover { background: var(--accent-light); border-color: var(--accent-light); box-shadow: 0 8px 28px rgba(61, 154, 138, 0.4); }
    .hero-actions .btn-outline {
        color: #fff;
        border-color: rgba(255, 255, 255, 0.4);
    }
    .hero-actions .btn-outline:hover { background: rgba(255, 255, 255, 0.12); border-color: #fff; color: #fff; }

    /* === 数据统计板块 === */
    .stats-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
    }
    .stat-card {
        background: var(--bg-card);
        border-radius: var(--radius);
        padding: 32px 24px;
        text-align: center;
        border: 1px solid var(--border);
        transition: var(--transition);
        box-shadow: var(--shadow);
    }
    .stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .stat-icon {
        width: 56px;
        height: 56px;
        border-radius: 14px;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 16px auto;
        font-size: 1.5rem;
        color: #fff;
    }
    .stat-icon.blue { background: linear-gradient(135deg, #2a7a8a, #3d9a8a); }
    .stat-icon.green { background: linear-gradient(135deg, #3d9a8a, #5ab8a8); }
    .stat-icon.teal { background: linear-gradient(135deg, #1a5a6a, #3a8a9a); }
    .stat-icon.cyan { background: linear-gradient(135deg, #2a8a7a, #4abaaa); }
    .stat-number {
        font-size: 2.5rem;
        font-weight: 800;
        color: var(--primary);
        line-height: 1.1;
    }
    .stat-number .suffix { font-size: 1.25rem; color: var(--secondary); }
    .stat-label { color: var(--text-light); font-size: 0.95rem; margin-top: 8px; }

    /* === 平台优势 === */
    .advantages-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }
    .advantage-card {
        background: var(--bg-card);
        border-radius: var(--radius);
        padding: 36px 28px;
        border: 1px solid var(--border);
        box-shadow: var(--shadow);
        transition: var(--transition);
        position: relative;
        overflow: hidden;
    }
    .advantage-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: linear-gradient(90deg, var(--secondary), var(--accent));
        opacity: 0;
        transition: var(--transition);
    }
    .advantage-card:hover::before { opacity: 1; }
    .advantage-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .advantage-card .adv-icon {
        width: 48px;
        height: 48px;
        border-radius: 12px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.25rem;
        color: #fff;
        margin-bottom: 16px;
        background: linear-gradient(135deg, var(--secondary), var(--accent));
    }
    .advantage-card h3 { margin-bottom: 12px; font-size: 1.25rem; }
    .advantage-card p { color: var(--text-light); font-size: 0.95rem; margin-bottom: 0; }

    /* === 分类入口 === */
    .categories-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 28px;
    }
    .category-card {
        position: relative;
        border-radius: var(--radius);
        overflow: hidden;
        box-shadow: var(--shadow);
        transition: var(--transition);
        background: var(--bg-card);
        border: 1px solid var(--border);
    }
    .category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .category-card .cat-img {
        width: 100%;
        height: 200px;
        object-fit: cover;
        transition: var(--transition);
    }
    .category-card:hover .cat-img { transform: scale(1.05); }
    .category-card .cat-overlay {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 200px;
        background: linear-gradient(to top, rgba(10, 30, 50, 0.6), transparent);
    }
    .category-card .cat-badge {
        position: absolute;
        top: 16px;
        left: 16px;
        background: rgba(255, 255, 255, 0.9);
        backdrop-filter: blur(8px);
        padding: 4px 14px;
        border-radius: 40px;
        font-size: 0.75rem;
        font-weight: 600;
        color: var(--primary);
    }
    .category-card .cat-info {
        padding: 20px 24px 24px;
    }
    .category-card .cat-info h3 { font-size: 1.125rem; margin-bottom: 8px; }
    .category-card .cat-info p { color: var(--text-light); font-size: 0.9rem; margin-bottom: 16px; }
    .category-card .cat-link {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-weight: 600;
        font-size: 0.9rem;
        color: var(--secondary);
    }
    .category-card .cat-link i { transition: var(--transition); }
    .category-card .cat-link:hover i { transform: translateX(4px); }

    /* === 最新资讯列表 === */
    .news-list {
        display: grid;
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .news-item {
        background: var(--bg-card);
        border-radius: var(--radius-sm);
        padding: 20px 24px;
        border: 1px solid var(--border);
        transition: var(--transition);
        display: flex;
        align-items: center;
        gap: 20px;
    }
    .news-item:hover { box-shadow: var(--shadow); border-color: var(--secondary); }
    .news-item .news-date {
        flex-shrink: 0;
        text-align: center;
        min-width: 60px;
    }
    .news-item .news-date .day {
        font-size: 1.5rem;
        font-weight: 800;
        color: var(--secondary);
        line-height: 1.1;
    }
    .news-item .news-date .mon {
        font-size: 0.75rem;
        color: var(--text-light);
    }
    .news-item .news-body { flex: 1; min-width: 0; }
    .news-item .news-body h4 {
        font-size: 1rem;
        margin-bottom: 4px;
        display: -webkit-box;
        -webkit-line-clamp: 1;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .news-item .news-body p {
        color: var(--text-light);
        font-size: 0.875rem;
        margin-bottom: 0;
        display: -webkit-box;
        -webkit-line-clamp: 1;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .news-item .news-tag {
        flex-shrink: 0;
        padding: 4px 14px;
        border-radius: 40px;
        font-size: 0.75rem;
        font-weight: 500;
        background: rgba(42, 122, 138, 0.1);
        color: var(--secondary);
    }
    .news-empty {
        text-align: center;
        padding: 40px 20px;
        color: var(--text-light);
        background: var(--bg-card);
        border-radius: var(--radius);
        border: 1px dashed var(--border);
    }
    .news-empty i { font-size: 2rem; color: var(--text-muted); margin-bottom: 12px; display: block; }

    /* === 注册流程 === */
    .steps-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
        counter-reset: step;
    }
    .step-card {
        background: var(--bg-card);
        border-radius: var(--radius);
        padding: 32px 24px;
        text-align: center;
        border: 1px solid var(--border);
        box-shadow: var(--shadow);
        transition: var(--transition);
        position: relative;
    }
    .step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
    .step-card .step-num {
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--secondary), var(--accent));
        color: #fff;
        font-weight: 800;
        font-size: 1.25rem;
        display: flex;
        align-items: center;
        justify-content: center;
        margin: 0 auto 16px auto;
    }
    .step-card h4 { margin-bottom: 8px; font-size: 1.125rem; }
    .step-card p { color: var(--text-light); font-size: 0.9rem; margin-bottom: 0; }
    .step-arrow {
        display: flex;
        align-items: center;
        justify-content: center;
        color: var(--text-muted);
        font-size: 1.5rem;
    }

    /* === FAQ === */
    .faq-list {
        max-width: 800px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        gap: 12px;
    }
    .faq-item {
        background: var(--bg-card);
        border-radius: var(--radius-sm);
        border: 1px solid var(--border);
        overflow: hidden;
        transition: var(--transition);
    }
    .faq-item:hover { border-color: var(--secondary); box-shadow: var(--shadow); }
    .faq-question {
        width: 100%;
        padding: 20px 24px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        font-size: 1rem;
        font-weight: 600;
        color: var(--primary);
        background: transparent;
        text-align: left;
        transition: var(--transition);
    }
    .faq-question:hover { background: rgba(42, 122, 138, 0.04); }
    .faq-question i { color: var(--secondary); transition: var(--transition); font-size: 1.125rem; flex-shrink: 0; }
    .faq-item.open .faq-question i { transform: rotate(180deg); }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease, padding 0.4s ease;
        padding: 0 24px;
        color: var(--text-light);
        font-size: 0.95rem;
        line-height: 1.7;
    }
    .faq-item.open .faq-answer {
        max-height: 300px;
        padding: 0 24px 20px 24px;
    }

    /* === CTA === */
    .cta-section {
        background: linear-gradient(135deg, var(--primary), var(--primary-light)), url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
        color: #fff;
        text-align: center;
        padding: 80px 0;
        position: relative;
    }
    .cta-section h2 { color: #fff; font-size: 2.25rem; margin-bottom: 16px; }
    .cta-section p { color: rgba(255, 255, 255, 0.75); max-width: 560px; margin: 0 auto 32px auto; font-size: 1.1rem; }
    .cta-section .btn-primary {
        background: var(--accent);
        border-color: var(--accent);
        font-size: 1.125rem;
        padding: 18px 44px;
    }
    .cta-section .btn-primary:hover { background: var(--accent-light); border-color: var(--accent-light); box-shadow: 0 8px 32px rgba(61, 154, 138, 0.4); }

    /* === 页脚 === */
    .site-footer {
        background: var(--bg-dark);
        color: rgba(255, 255, 255, 0.7);
        padding: 48px 0 100px 0;
    }
    .site-footer .container {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr;
        gap: 40px;
    }
    .site-footer .footer-brand .logo { color: #fff; margin-bottom: 16px; }
    .site-footer .footer-brand .logo i { color: var(--accent-light); }
    .site-footer .footer-brand .logo span { background: linear-gradient(135deg, #fff, var(--accent-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
    .site-footer .footer-brand p { font-size: 0.9rem; max-width: 360px; color: rgba(255, 255, 255, 0.5); }
    .site-footer h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
    .site-footer ul li { margin-bottom: 8px; }
    .site-footer ul a { color: rgba(255, 255, 255, 0.55); font-size: 0.9rem; }
    .site-footer ul a:hover { color: var(--accent-light); }
    .footer-bottom {
        border-top: 1px solid rgba(255, 255, 255, 0.08);
        margin-top: 32px;
        padding-top: 24px;
        text-align: center;
        font-size: 0.85rem;
        color: rgba(255, 255, 255, 0.35);
        grid-column: 1 / -1;
    }
    .footer-bottom a { color: rgba(255, 255, 255, 0.5); }
    .footer-bottom a:hover { color: var(--accent-light); }

    /* === 响应式 === */
    @media (max-width: 1024px) {
        h1 { font-size: 2.25rem; }
        .hero h1 { font-size: 2.5rem; }
        .stats-grid { grid-template-columns: repeat(2, 1fr); }
        .advantages-grid { grid-template-columns: repeat(2, 1fr); }
        .categories-grid { grid-template-columns: repeat(2, 1fr); }
        .steps-grid { grid-template-columns: repeat(2, 1fr); }
        .site-footer .container { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
        .nav-desktop { display: none; }
        .nav-toggle { display: block; }
        .bottom-tab-nav { display: block; }
        .site-footer { padding-bottom: 80px; }
        .hero { min-height: 75vh; }
        .hero h1 { font-size: 2rem; }
        .hero p { font-size: 1rem; }
        .hero-content { max-width: 100%; }
        .hero-actions { flex-direction: column; }
        .hero-actions .btn { width: 100%; justify-content: center; }
        .section { padding: 56px 0; }
        .section-title { font-size: 1.625rem; }
        .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
        .stat-card { padding: 24px 16px; }
        .stat-number { font-size: 2rem; }
        .advantages-grid { grid-template-columns: 1fr; }
        .categories-grid { grid-template-columns: 1fr; }
        .steps-grid { grid-template-columns: 1fr; gap: 16px; }
        .step-arrow { display: none; }
        .news-item { flex-direction: column; align-items: flex-start; gap: 12px; }
        .news-item .news-date { display: flex; gap: 8px; align-items: baseline; }
        .news-item .news-date .day { font-size: 1.25rem; }
        .news-item .news-tag { align-self: flex-start; }
        .site-footer .container { grid-template-columns: 1fr; gap: 28px; }
        .cta-section { padding: 56px 0; }
        .cta-section h2 { font-size: 1.75rem; }
        .faq-question { font-size: 0.95rem; padding: 16px 18px; }
        .faq-answer { font-size: 0.9rem; }
    }
    @media (max-width: 520px) {
        .container { padding: 0 16px; }
        .hero h1 { font-size: 1.75rem; }
        .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
        .stat-card { padding: 18px 12px; }
        .stat-number { font-size: 1.625rem; }
        .stat-label { font-size: 0.8rem; }
        .section { padding: 40px 0; }
        .btn { padding: 12px 24px; font-size: 0.9rem; }
        .btn-lg { padding: 14px 32px; font-size: 1rem; }
    }

    /* === 移动端抽屉菜单 (可选) === */
    .mobile-drawer {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(10, 30, 50, 0.6);
        backdrop-filter: blur(8px);
        z-index: 999;
        display: none;
        opacity: 0;
        transition: opacity 0.3s ease;
    }
    .mobile-drawer.open { display: block; opacity: 1; }
    .mobile-drawer-inner {
        position: absolute;
        top: 0;
        left: 0;
        bottom: 0;
        width: 280px;
        background: #fff;
        padding: 32px 24px;
        box-shadow: 4px 0 40px rgba(10, 30, 50, 0.2);
        transform: translateX(-100%);
        transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .mobile-drawer.open .mobile-drawer-inner { transform: translateX(0); }
    .mobile-drawer-inner .close-btn {
        position: absolute;
        top: 16px;
        right: 16px;
        font-size: 1.5rem;
        color: var(--text-light);
        padding: 8px;
    }
    .mobile-drawer-inner nav { margin-top: 40px; }
    .mobile-drawer-inner nav a {
        display: block;
        padding: 14px 0;
        font-size: 1.125rem;
        font-weight: 500;
        color: var(--text);
        border-bottom: 1px solid var(--border);
    }
    .mobile-drawer-inner nav a.active { color: var(--secondary); }
    .mobile-drawer-inner nav a:last-child { border-bottom: none; }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a5cff;
            --primary-dark: #0d3ea8;
            --primary-light: #e8eeff;
            --primary-gradient: linear-gradient(135deg, #1a5cff 0%, #0d3ea8 100%);
            --accent: #00c9a7;
            --accent-dark: #00a88b;
            --bg-body: #f8faff;
            --bg-card: #ffffff;
            --bg-dark: #0b1a33;
            --bg-section-alt: #f0f4fe;
            --text-primary: #0b1a33;
            --text-secondary: #4a5a72;
            --text-muted: #8a9bb5;
            --text-light: #ffffff;
            --border: #dce3ef;
            --border-light: #eef2f7;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 2px 8px rgba(10, 30, 60, 0.06);
            --shadow-md: 0 8px 30px rgba(10, 30, 60, 0.08);
            --shadow-lg: 0 20px 60px rgba(10, 30, 60, 0.12);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container: 1200px;
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--nav-height);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: 1rem;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.02);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            text-decoration: none;
        }
        .logo i {
            font-size: 1.5rem;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo span {
            -webkit-text-fill-color: var(--text-primary);
        }
        .logo:hover {
            opacity: 0.9;
        }

        /* Desktop Nav */
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-desktop a {
            display: inline-flex;
            align-items: center;
            padding: 8px 20px;
            border-radius: 100px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: background var(--transition), color var(--transition);
            text-decoration: none;
            position: relative;
        }
        .nav-desktop a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .nav-desktop a.active {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(26, 92, 255, 0.3);
        }
        .nav-desktop a.active:hover {
            background: var(--primary-dark);
        }

        /* Mobile Toggle */
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-light);
        }

        /* Mobile Menu Overlay */
        .mobile-overlay {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(11, 26, 51, 0.5);
            backdrop-filter: blur(4px);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
        }
        .mobile-overlay.open {
            opacity: 1;
        }
        .mobile-menu {
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            background: #fff;
            padding: 16px 24px 32px;
            border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            box-shadow: var(--shadow-lg);
            transform: translateY(-20px);
            opacity: 0;
            pointer-events: none;
            transition: transform var(--transition), opacity var(--transition);
            z-index: 1000;
        }
        .mobile-menu.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu a {
            display: block;
            padding: 14px 16px;
            font-size: 1.05rem;
            font-weight: 500;
            color: var(--text-primary);
            border-radius: var(--radius-sm);
            transition: background var(--transition), color var(--transition);
            text-decoration: none;
        }
        .mobile-menu a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .mobile-menu a.active {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
        }

        /* ===== Article Hero / Banner ===== */
        .article-hero {
            position: relative;
            padding: 80px 0 60px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 26, 51, 0.88) 0%, rgba(11, 26, 51, 0.72) 100%);
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .article-hero .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 18px;
            flex-wrap: wrap;
        }
        .article-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: color var(--transition);
        }
        .article-hero .breadcrumb a:hover {
            color: #fff;
        }
        .article-hero .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.4);
        }
        .article-hero .breadcrumb .current {
            color: #fff;
            font-weight: 500;
        }
        .article-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            max-width: 860px;
            line-height: 1.25;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
        }
        .article-hero .meta {
            display: flex;
            flex-wrap: wrap;
            gap: 18px 30px;
            color: rgba(255, 255, 255, 0.75);
            font-size: 0.95rem;
        }
        .article-hero .meta span {
            display: flex;
            align-items: center;
            gap: 7px;
        }
        .article-hero .meta i {
            font-size: 0.85rem;
            color: var(--accent);
        }
        .article-hero .meta .category-tag {
            display: inline-block;
            background: var(--accent);
            color: #0b1a33;
            padding: 3px 14px;
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }

        @media (max-width: 768px) {
            .article-hero {
                padding: 50px 0 40px;
                min-height: 220px;
            }
            .article-hero h1 {
                font-size: 1.6rem;
            }
            .article-hero .meta {
                font-size: 0.85rem;
                gap: 12px 20px;
            }
        }
        @media (max-width: 520px) {
            .article-hero h1 {
                font-size: 1.35rem;
            }
        }

        /* ===== Article Content ===== */
        .article-main {
            padding: 50px 0 70px;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
        }
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 40px;
            }
        }

        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 40px 44px;
            border: 1px solid var(--border-light);
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text-secondary);
        }
        .article-body .content p {
            margin-bottom: 1.4em;
        }
        .article-body .content h2 {
            font-size: 1.5rem;
            margin: 2em 0 0.8em;
            color: var(--text-primary);
        }
        .article-body .content h3 {
            font-size: 1.2rem;
            margin: 1.6em 0 0.6em;
            color: var(--text-primary);
        }
        .article-body .content ul,
        .article-body .content ol {
            margin: 1em 0 1.4em 1.6em;
        }
        .article-body .content li {
            margin-bottom: 0.5em;
            list-style: disc;
        }
        .article-body .content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-body .content a:hover {
            color: var(--primary-dark);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 24px;
            margin: 1.6em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-primary);
            font-style: italic;
        }
        .article-body .content img {
            border-radius: var(--radius-sm);
            margin: 1.6em auto;
            box-shadow: var(--shadow-sm);
        }
        .article-body .content .cms-code {
            background: #f0f2f5;
            padding: 16px 20px;
            border-radius: var(--radius-sm);
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.9rem;
            overflow-x: auto;
            margin: 1.2em 0;
            border: 1px solid var(--border);
        }
        .article-body .not-found {
            text-align: center;
            padding: 60px 20px;
        }
        .article-body .not-found i {
            font-size: 3.5rem;
            color: var(--text-muted);
            margin-bottom: 20px;
            display: block;
        }
        .article-body .not-found h2 {
            font-size: 1.6rem;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .article-body .not-found p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }
        .article-body .not-found .btn {
            display: inline-flex;
        }

        @media (max-width: 768px) {
            .article-body {
                padding: 24px 20px;
            }
            .article-body .content {
                font-size: 1rem;
            }
        }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            padding: 28px 24px;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-primary);
        }
        .sidebar-card h3 i {
            color: var(--primary);
            font-size: 1rem;
        }
        .sidebar-list li {
            padding: 12px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .sidebar-list li:last-child {
            border-bottom: none;
        }
        .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            color: var(--text-secondary);
            text-decoration: none;
            transition: color var(--transition);
            font-size: 0.95rem;
            line-height: 1.5;
        }
        .sidebar-list a:hover {
            color: var(--primary);
        }
        .sidebar-list a .num {
            flex-shrink: 0;
            width: 26px;
            height: 26px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.75rem;
            font-weight: 700;
            margin-top: 2px;
        }
        .sidebar-list a .num.top {
            background: var(--primary);
            color: #fff;
        }

        .sidebar-cta {
            background: var(--primary-gradient);
            color: #fff;
            padding: 32px 24px;
            text-align: center;
            border-radius: var(--radius-md);
        }
        .sidebar-cta h3 {
            color: #fff;
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .sidebar-cta p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 0.92rem;
            margin-bottom: 18px;
        }
        .sidebar-cta .btn-white {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            color: var(--primary);
            padding: 12px 28px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: transform var(--transition), box-shadow var(--transition);
            text-decoration: none;
        }
        .sidebar-cta .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
            color: var(--primary-dark);
        }

        @media (max-width: 1024px) {
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 640px) {
            .article-sidebar {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 0;
        }
        .site-footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px 48px;
        }
        .site-footer .footer-brand .logo {
            color: #fff;
            font-size: 1.25rem;
            margin-bottom: 14px;
        }
        .site-footer .footer-brand .logo i {
            -webkit-text-fill-color: transparent;
        }
        .site-footer .footer-brand .logo span {
            -webkit-text-fill-color: #fff;
        }
        .site-footer .footer-brand p {
            font-size: 0.92rem;
            line-height: 1.7;
            max-width: 380px;
            color: rgba(255, 255, 255, 0.6);
        }
        .site-footer h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .site-footer ul li {
            margin-bottom: 10px;
        }
        .site-footer ul a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            transition: color var(--transition);
            text-decoration: none;
        }
        .site-footer ul a:hover {
            color: #fff;
        }
        .footer-bottom {
            grid-column: 1 / -1;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
        }
        .footer-bottom a:hover {
            color: #fff;
        }
        @media (max-width: 768px) {
            .site-footer .container {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .site-footer .footer-brand p {
                max-width: 100%;
            }
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 100px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
            text-decoration: none;
        }
        .btn-primary {
            background: var(--primary-gradient);
            color: #fff;
            box-shadow: 0 4px 16px rgba(26, 92, 255, 0.3);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(26, 92, 255, 0.4);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Mobile Bottom Tab ===== */
        .mobile-bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1001;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-top: 1px solid var(--border-light);
            box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.04);
            padding: 6px 0 env(safe-area-inset-bottom, 6px);
        }
        .mobile-bottom-tab .tab-inner {
            display: flex;
            justify-content: space-around;
            align-items: center;
            max-width: 500px;
            margin: 0 auto;
        }
        .mobile-bottom-tab a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 6px 12px;
            font-size: 0.65rem;
            font-weight: 500;
            color: var(--text-muted);
            text-decoration: none;
            transition: color var(--transition);
            border-radius: var(--radius-sm);
            min-width: 60px;
        }
        .mobile-bottom-tab a i {
            font-size: 1.2rem;
        }
        .mobile-bottom-tab a.active {
            color: var(--primary);
        }
        .mobile-bottom-tab a.active i {
            font-weight: 900;
        }
        .mobile-bottom-tab a:hover {
            color: var(--primary);
        }

        /* ===== Responsive ===== */
        @media (max-width: 768px) {
            body {
                padding-bottom: 68px;
            }
            .nav-desktop {
                display: none;
            }
            .nav-toggle {
                display: block;
            }
            .mobile-bottom-tab {
                display: block;
            }
        }
        @media (max-width: 520px) {
            .site-header .container {
                padding: 0 12px;
            }
            .logo {
                font-size: 1.1rem;
            }
            .logo i {
                font-size: 1.2rem;
            }
            .article-hero h1 {
                font-size: 1.2rem;
            }
            .article-body {
                padding: 18px 14px;
            }
            .sidebar-card {
                padding: 20px 16px;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-body);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 8px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* ===== Selection ===== */
        ::selection {
            background: var(--primary);
            color: #fff;
        }

        /* ===== Focus visible ===== */
        :focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

/* roulang page: category1 */
:root {
            --primary: #1a56db;
            --primary-dark: #1340a0;
            --primary-light: #e8effd;
            --primary-gradient: linear-gradient(135deg, #1a56db 0%, #0f3a8a 100%);
            --accent: #f59e0b;
            --accent-light: #fef3c7;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-card: #ffffff;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-h);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            transition: background var(--transition), box-shadow var(--transition);
        }

        .site-header.scrolled {
            background: rgba(255, 255, 255, 0.98);
            box-shadow: var(--shadow-md);
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            transition: opacity var(--transition);
        }

        .logo i {
            font-size: 26px;
            color: var(--accent);
        }

        .logo:hover {
            opacity: 0.85;
            color: var(--primary);
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-desktop a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-light);
            transition: background var(--transition), color var(--transition);
            position: relative;
        }

        .nav-desktop a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        .nav-desktop a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }

        .nav-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }

        .nav-toggle {
            display: none;
            font-size: 24px;
            color: var(--text);
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }

        .nav-toggle:hover {
            background: var(--border-light);
        }

        /* ===== Mobile Nav Drawer ===== */
        .mobile-drawer {
            position: fixed;
            top: var(--header-h);
            left: 0;
            right: 0;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            padding: 16px 24px;
            display: none;
            flex-direction: column;
            gap: 4px;
            box-shadow: var(--shadow-lg);
            z-index: 999;
            animation: slideDown 0.3s ease;
        }

        .mobile-drawer.open {
            display: flex;
        }

        .mobile-drawer a {
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 16px;
            font-weight: 500;
            color: var(--text);
            transition: background var(--transition), color var(--transition);
        }

        .mobile-drawer a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }

        .mobile-drawer a.active {
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }

        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-12px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ===== Mobile Bottom Tab ===== */
        .bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: var(--bg-white);
            border-top: 1px solid var(--border);
            padding: 6px 0 env(safe-area-inset-bottom, 6px) 0;
            z-index: 999;
            justify-content: space-around;
            box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.06);
        }

        .bottom-tab a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 6px 12px;
            font-size: 11px;
            font-weight: 500;
            color: var(--text-light);
            transition: color var(--transition);
            border-radius: var(--radius-sm);
        }

        .bottom-tab a i {
            font-size: 20px;
            line-height: 1;
        }

        .bottom-tab a:hover,
        .bottom-tab a.active {
            color: var(--primary);
        }

        .bottom-tab a.active {
            font-weight: 600;
        }

        /* ===== Page Banner ===== */
        .page-banner {
            margin-top: var(--header-h);
            padding: 80px 0 60px;
            background: var(--primary-gradient);
            position: relative;
            overflow: hidden;
        }

        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }

        .page-banner .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }

        .page-banner h1 {
            font-size: 42px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .page-banner p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 640px;
            margin: 0 auto;
            line-height: 1.6;
        }

        .page-banner .breadcrumb {
            display: flex;
            justify-content: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 20px;
        }

        .page-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.85);
        }

        .page-banner .breadcrumb a:hover {
            color: #fff;
        }

        .page-banner .breadcrumb span {
            color: rgba(255, 255, 255, 0.9);
        }

        /* ===== Section Common ===== */
        section {
            padding: 80px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 52px;
        }

        .section-title h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.3px;
            margin-bottom: 12px;
        }

        .section-title p {
            font-size: 16px;
            color: var(--text-light);
            max-width: 560px;
            margin: 0 auto;
        }

        .section-title .tag {
            display: inline-block;
            padding: 4px 16px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 32px 28px;
            transition: transform var(--transition), box-shadow var(--transition);
        }

        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .card .icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--primary);
            background: var(--primary-light);
            margin-bottom: 18px;
        }

        .card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 10px;
        }

        .card p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.7;
        }

        .card .badge {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 12px;
            font-size: 12px;
            font-weight: 600;
            background: var(--accent-light);
            color: var(--accent);
            margin-bottom: 12px;
        }

        /* ===== Steps ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step-counter;
        }

        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 32px 24px;
            text-align: center;
            position: relative;
            transition: transform var(--transition), box-shadow var(--transition);
        }

        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .step-item .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: #fff;
            font-size: 20px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
        }

        .step-item h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 8px;
        }

        .step-item p {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
        }

        .step-item .arrow {
            position: absolute;
            right: -16px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 20px;
            color: var(--border);
        }

        .steps .step-item:last-child .arrow {
            display: none;
        }

        /* ===== Content Section ===== */
        .content-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .content-block .text h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 16px;
            letter-spacing: -0.3px;
        }

        .content-block .text p {
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.8;
            margin-bottom: 16px;
        }

        .content-block .text ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-top: 12px;
        }

        .content-block .text ul li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: var(--text);
        }

        .content-block .text ul li i {
            color: var(--primary);
            margin-top: 3px;
            font-size: 14px;
        }

        .content-block .image {
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }

        .content-block .image img {
            width: 100%;
            height: auto;
            display: block;
        }

        .content-block.reverse {
            direction: rtl;
        }

        .content-block.reverse .text,
        .content-block.reverse .image {
            direction: ltr;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: box-shadow var(--transition);
        }

        .faq-item:hover {
            box-shadow: var(--shadow);
        }

        .faq-question {
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
        }

        .faq-question:hover {
            background: var(--border-light);
        }

        .faq-question i {
            font-size: 16px;
            color: var(--text-light);
            transition: transform var(--transition);
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        .faq-answer {
            padding: 0 24px 18px;
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.7;
            display: none;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary-gradient);
            padding: 80px 0;
            text-align: center;
            position: relative;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }

        .cta-section .container {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: 34px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }

        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 540px;
            margin: 0 auto 28px;
        }

        .btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-size: 16px;
            font-weight: 600;
            transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
            border: none;
        }

        .btn-primary {
            background: #fff;
            color: var(--primary);
        }

        .btn-primary:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
            color: var(--primary);
        }

        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.5);
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            transform: translateY(-2px);
            color: #fff;
        }

        .btn-sm {
            padding: 10px 22px;
            font-size: 14px;
        }

        /* ===== Tags ===== */
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 28px;
        }

        .tag-item {
            padding: 6px 18px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            background: var(--bg-white);
            border: 1px solid var(--border);
            color: var(--text-light);
            transition: background var(--transition), color var(--transition), border-color var(--transition);
        }

        .tag-item:hover {
            background: var(--primary-light);
            color: var(--primary);
            border-color: var(--primary);
        }

        /* ===== Tips Box ===== */
        .tips-box {
            background: var(--primary-light);
            border-left: 4px solid var(--primary);
            border-radius: var(--radius-sm);
            padding: 24px 28px;
            margin: 24px 0;
        }

        .tips-box h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .tips-box p {
            font-size: 14px;
            color: var(--text);
            line-height: 1.7;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 30px;
        }

        .site-footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
        }

        .site-footer .logo {
            color: #fff;
            margin-bottom: 12px;
        }

        .site-footer .logo i {
            color: var(--accent);
        }

        .site-footer .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 360px;
        }

        .site-footer h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }

        .site-footer ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .site-footer ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            transition: color var(--transition);
        }

        .site-footer ul li a:hover {
            color: #fff;
        }

        .site-footer .footer-bottom {
            grid-column: 1 / -1;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            margin-top: 8px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
            text-align: center;
        }

        .site-footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
        }

        .site-footer .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .steps {
                grid-template-columns: repeat(2, 1fr);
            }

            .steps .step-item:nth-child(2) .arrow {
                display: none;
            }

            .content-block {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .content-block.reverse {
                direction: ltr;
            }
        }

        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }

            .nav-toggle {
                display: block;
            }

            .bottom-tab {
                display: flex;
            }

            .site-header .container {
                padding: 0 16px;
            }

            .page-banner {
                padding: 60px 0 40px;
            }

            .page-banner h1 {
                font-size: 28px;
            }

            .page-banner p {
                font-size: 15px;
            }

            section {
                padding: 56px 0;
            }

            .section-title h2 {
                font-size: 26px;
            }

            .card-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .steps {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .steps .step-item .arrow {
                display: none;
            }

            .site-footer .container {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .site-footer .footer-brand p {
                max-width: 100%;
            }

            .cta-section h2 {
                font-size: 26px;
            }

            .btn-group {
                flex-direction: column;
                align-items: center;
            }

            .content-block .text h2 {
                font-size: 22px;
            }

            section {
                padding: 48px 0;
            }

            .container {
                padding: 0 16px;
            }

            .page-banner .breadcrumb {
                font-size: 13px;
                flex-wrap: wrap;
            }
        }

        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 24px;
            }

            .card {
                padding: 24px 20px;
            }

            .step-item {
                padding: 24px 16px;
            }

            .faq-question {
                padding: 14px 18px;
                font-size: 14px;
            }

            .faq-answer {
                padding: 0 18px 14px;
                font-size: 14px;
            }

            .btn {
                padding: 12px 24px;
                font-size: 14px;
                width: 100%;
                justify-content: center;
            }

            .logo {
                font-size: 18px;
            }

            .logo i {
                font-size: 20px;
            }
        }

        /* ===== Utilities ===== */
        .text-center {
            text-align: center;
        }

        .mt-8 {
            margin-top: 8px;
        }

        .mt-16 {
            margin-top: 16px;
        }

        .mt-24 {
            margin-top: 24px;
        }

        .mt-32 {
            margin-top: 32px;
        }

        .mb-16 {
            margin-bottom: 16px;
        }

        .mb-24 {
            margin-bottom: 24px;
        }

        .gap-8 {
            gap: 8px;
        }

        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* Extra bottom padding for mobile tab */
        @media (max-width: 768px) {
            body {
                padding-bottom: 60px;
            }
            .site-footer {
                padding-bottom: 80px;
            }
        }