/* roulang page: index */
:root {
  --nav-width: 260px;
  --color-dark: #0f1729;
  --color-darker: #0a0f1e;
  --color-accent: #f59e0b;
  --color-accent2: #dc2626;
  --color-light: #f8fafc;
  --color-muted: #64748b;
  --color-card: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #1e293b;
  --color-text-light: #475569;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --transition: all 0.25s ease;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'PingFang SC','Microsoft YaHei',system-ui,sans-serif; background: var(--color-light); color: var(--color-text); line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea { font-family: inherit; outline: none; border: none; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .container { padding: 0 16px; } }

/* 左侧导航布局 */
.layout-wrapper { display: flex; min-height: 100vh; }
.sidebar { width: var(--nav-width); position: fixed; left: 0; top: 0; bottom: 0; background: var(--color-dark); color: #fff; display: flex; flex-direction: column; z-index: 100; transition: var(--transition); overflow-y: auto; }
.main-content { margin-left: var(--nav-width); flex: 1; min-height: 100vh; }

/* 导航品牌 */
.sidebar-brand { padding: 28px 24px 20px; border-bottom: 1px solid rgba(255,255,255,0.06); }
.sidebar-brand .logo { font-size: 22px; font-weight: 700; color: #fff; letter-spacing: 0.5px; display: flex; align-items: center; gap: 10px; }
.sidebar-brand .logo .logo-icon { width: 36px; height: 36px; background: var(--color-accent); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 800; color: var(--color-dark); }

/* 导航链接 */
.sidebar-nav { padding: 16px 16px 24px; flex: 1; }
.sidebar-nav .nav-item { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-radius: 8px; color: rgba(255,255,255,0.65); font-size: 15px; font-weight: 500; margin-bottom: 4px; transition: var(--transition); cursor: pointer; }
.sidebar-nav .nav-item:hover { background: rgba(255,255,255,0.08); color: #fff; }
.sidebar-nav .nav-item.active { background: rgba(245,158,11,0.15); color: var(--color-accent); }
.sidebar-nav .nav-item .nav-icon { width: 20px; text-align: center; font-size: 16px; }
.sidebar-nav .nav-label { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: rgba(255,255,255,0.25); padding: 16px 16px 8px; font-weight: 600; }

/* 页脚在侧栏底部 */
.sidebar-footer { padding: 16px 24px 24px; border-top: 1px solid rgba(255,255,255,0.06); font-size: 12px; color: rgba(255,255,255,0.3); text-align: center; }

/* 顶部移动端导航 */
.mobile-header { display: none; background: var(--color-dark); padding: 12px 16px; position: sticky; top: 0; z-index: 200; }
.mobile-header .mobile-logo { font-size: 18px; font-weight: 700; color: #fff; display: flex; align-items: center; gap: 8px; }
.mobile-header .mobile-logo .logo-icon { width: 30px; height: 30px; background: var(--color-accent); border-radius: 6px; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 800; color: var(--color-dark); }
.mobile-header .hamburger { background: none; border: none; color: #fff; font-size: 24px; cursor: pointer; padding: 4px; }
.mobile-menu { display: none; background: var(--color-darker); padding: 8px 16px 16px; border-top: 1px solid rgba(255,255,255,0.06); }
.mobile-menu.open { display: block; }
.mobile-menu .mobile-nav-item { display: block; padding: 12px 16px; color: rgba(255,255,255,0.65); font-size: 15px; border-radius: 8px; margin-bottom: 2px; }
.mobile-menu .mobile-nav-item:hover { background: rgba(255,255,255,0.08); color: #fff; }
.mobile-menu .mobile-nav-item.active { color: var(--color-accent); background: rgba(245,158,11,0.12); }

/* Hero */
.hero-section { position: relative; min-height: 520px; display: flex; align-items: center; overflow: hidden; background: var(--color-dark); }
.hero-section .hero-bg { position: absolute; inset: 0; background-image: url('/assets/images/backpic/back-1.png'); background-size: cover; background-position: center; opacity: 0.4; }
.hero-section .hero-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,23,41,0.92) 0%, rgba(15,23,41,0.70) 100%); }
.hero-section .hero-content { position: relative; z-index: 2; padding: 80px 0; }
.hero-section .hero-badge { display: inline-block; padding: 6px 16px; background: rgba(245,158,11,0.15); color: var(--color-accent); border-radius: 20px; font-size: 13px; font-weight: 600; letter-spacing: 0.5px; margin-bottom: 20px; }
.hero-section h1 { font-size: 48px; font-weight: 800; color: #fff; line-height: 1.15; margin-bottom: 20px; }
.hero-section h1 span { color: var(--color-accent); }
.hero-section p { font-size: 18px; color: rgba(255,255,255,0.7); max-width: 560px; margin-bottom: 32px; line-height: 1.7; }
.hero-section .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-section .btn-primary { padding: 14px 36px; background: var(--color-accent); color: var(--color-dark); font-weight: 700; border-radius: 8px; font-size: 16px; transition: var(--transition); display: inline-block; }
.hero-section .btn-primary:hover { background: #d97706; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.3); }
.hero-section .btn-outline { padding: 14px 36px; border: 2px solid rgba(255,255,255,0.25); color: #fff; font-weight: 600; border-radius: 8px; font-size: 16px; transition: var(--transition); display: inline-block; }
.hero-section .btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent); background: rgba(245,158,11,0.08); }

/* 通用板块 */
.section { padding: 80px 0; }
.section-title { font-size: 32px; font-weight: 700; color: var(--color-text); margin-bottom: 12px; letter-spacing: -0.3px; }
.section-subtitle { font-size: 16px; color: var(--color-text-light); max-width: 600px; margin-bottom: 40px; line-height: 1.7; }
.section-header { margin-bottom: 48px; }
.section-header.centered { text-align: center; }
.section-header.centered .section-subtitle { margin-left: auto; margin-right: auto; }

/* 卡片 */
.card { background: var(--color-card); border-radius: var(--radius); box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); transition: var(--transition); overflow: hidden; }
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card .card-img { width: 100%; height: 200px; object-fit: cover; }
.card .card-body { padding: 20px 24px 24px; }
.card .card-tag { display: inline-block; padding: 4px 12px; background: rgba(245,158,11,0.10); color: #b45309; border-radius: 4px; font-size: 12px; font-weight: 600; margin-bottom: 10px; }
.card .card-title { font-size: 18px; font-weight: 600; color: var(--color-text); margin-bottom: 8px; line-height: 1.4; }
.card .card-title a:hover { color: var(--color-accent); }
.card .card-text { font-size: 14px; color: var(--color-text-light); line-height: 1.6; margin-bottom: 12px; }
.card .card-meta { font-size: 13px; color: var(--color-muted); display: flex; align-items: center; gap: 12px; }

/* 网格 */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* 统计块 */
.stat-block { text-align: center; padding: 32px 20px; }
.stat-block .stat-number { font-size: 42px; font-weight: 800; color: var(--color-accent); line-height: 1.1; }
.stat-block .stat-label { font-size: 15px; color: var(--color-text-light); margin-top: 8px; }

/* FAQ */
.faq-item { border-bottom: 1px solid var(--color-border); padding: 20px 0; }
.faq-item summary { font-size: 16px; font-weight: 600; color: var(--color-text); cursor: pointer; padding: 4px 0; display: flex; align-items: center; gap: 12px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item .faq-icon { width: 24px; height: 24px; flex-shrink: 0; border-radius: 50%; background: var(--color-accent); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 700; transition: var(--transition); }
.faq-item[open] .faq-icon { background: var(--color-accent2); }
.faq-item .faq-answer { padding: 12px 0 4px 36px; font-size: 15px; color: var(--color-text-light); line-height: 1.7; }

/* CTA */
.cta-section { background: var(--color-dark); padding: 64px 0; position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background-image: url('/assets/images/backpic/back-2.png'); background-size: cover; background-position: center; opacity: 0.10; }
.cta-section .cta-content { position: relative; z-index: 2; text-align: center; }
.cta-section h2 { font-size: 36px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.cta-section p { font-size: 17px; color: rgba(255,255,255,0.65); max-width: 520px; margin: 0 auto 28px; }
.cta-section .btn-cta { padding: 16px 44px; background: var(--color-accent); color: var(--color-dark); font-weight: 700; border-radius: 8px; font-size: 17px; transition: var(--transition); display: inline-block; }
.cta-section .btn-cta:hover { background: #d97706; transform: translateY(-2px); box-shadow: 0 8px 28px rgba(245,158,11,0.3); }

/* 页脚 */
.footer { background: var(--color-darker); color: rgba(255,255,255,0.5); padding: 40px 0 24px; font-size: 14px; }
.footer .footer-brand { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 8px; }
.footer .footer-desc { max-width: 360px; margin-bottom: 20px; color: rgba(255,255,255,0.4); line-height: 1.7; }
.footer .footer-links { display: flex; flex-wrap: wrap; gap: 16px 32px; margin-bottom: 20px; }
.footer .footer-links a { color: rgba(255,255,255,0.5); }
.footer .footer-links a:hover { color: var(--color-accent); }
.footer .footer-divider { border: none; border-top: 1px solid rgba(255,255,255,0.06); margin: 16px 0; }
.footer .footer-copy { font-size: 13px; color: rgba(255,255,255,0.25); }

/* 标签 */
.tag { display: inline-block; padding: 4px 14px; background: var(--color-light); border: 1px solid var(--color-border); border-radius: 20px; font-size: 13px; color: var(--color-text-light); transition: var(--transition); }
.tag:hover { border-color: var(--color-accent); color: var(--color-accent); background: rgba(245,158,11,0.05); }

/* 文章页 */
.article-header { padding: 48px 0 24px; }
.article-header h1 { font-size: 36px; font-weight: 700; line-height: 1.25; margin-bottom: 16px; }
.article-meta { display: flex; gap: 20px; color: var(--color-muted); font-size: 14px; flex-wrap: wrap; }
.article-body { font-size: 16px; line-height: 1.9; color: var(--color-text-light); }
.article-body p { margin-bottom: 20px; }
.article-body img { border-radius: var(--radius); margin: 24px 0; }

/* 分类页 */
.category-header { padding: 48px 0 24px; }
.category-header h1 { font-size: 36px; font-weight: 700; }
.category-header .category-desc { font-size: 16px; color: var(--color-text-light); max-width: 600px; margin-top: 8px; }

/* 响应式 */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-section h1 { font-size: 38px; }
}
@media (max-width: 768px) {
  .sidebar { display: none; }
  .mobile-header { display: flex; align-items: center; justify-content: space-between; }
  .main-content { margin-left: 0; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .hero-section { min-height: 400px; }
  .hero-section h1 { font-size: 30px; }
  .hero-section p { font-size: 16px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 26px; }
  .stat-block .stat-number { font-size: 32px; }
  .cta-section h2 { font-size: 28px; }
  .article-header h1 { font-size: 28px; }
  .category-header h1 { font-size: 28px; }
}
@media (max-width: 520px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .hero-section h1 { font-size: 26px; }
  .hero-section .hero-actions { flex-direction: column; }
  .hero-section .btn-primary, .hero-section .btn-outline { text-align: center; }
  .section-title { font-size: 22px; }
  .card .card-img { height: 160px; }
}

/* 空状态 */
.empty-state { padding: 40px 20px; text-align: center; color: var(--color-muted); font-size: 15px; background: var(--color-card); border-radius: var(--radius); border: 1px dashed var(--color-border); }

/* 按钮通用 */
.btn { display: inline-block; padding: 12px 28px; border-radius: 8px; font-weight: 600; font-size: 15px; transition: var(--transition); cursor: pointer; text-align: center; }
.btn-primary { background: var(--color-accent); color: var(--color-dark); }
.btn-primary:hover { background: #d97706; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(245,158,11,0.25); }
.btn-outline { border: 2px solid var(--color-border); color: var(--color-text); }
.btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* 分隔线 */
.divider { border: none; border-top: 1px solid var(--color-border); margin: 16px 0; }

/* 列表样式 */
.list-check { list-style: none; padding: 0; }
.list-check li { padding: 8px 0 8px 28px; position: relative; color: var(--color-text-light); font-size: 15px; }
.list-check li::before { content: '✓'; position: absolute; left: 0; color: var(--color-accent); font-weight: 700; }

/* 焦点状态 */
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; border-radius: 4px; }

/* roulang page: category1 */
:root {
            --primary: #dc2626;
            --primary-dark: #b91c1c;
            --accent: #1e3a5f;
            --accent-light: #2a4f7a;
            --dark-bg: #0f172a;
            --card-bg: #ffffff;
            --soft-bg: #f8fafc;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border-light: #e2e8f0;
            --radius: 0.75rem;
            --radius-lg: 1rem;
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
            background: var(--soft-bg);
            color: var(--text-primary);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            transition: var(--transition);
        }
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .sidebar-layout {
            display: flex;
            min-height: 100vh;
        }

        .sidebar {
            width: 240px;
            flex-shrink: 0;
            background: var(--dark-bg);
            color: #fff;
            padding: 32px 20px;
            display: flex;
            flex-direction: column;
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 100;
            overflow-y: auto;
            border-right: 1px solid rgba(255, 255, 255, 0.06);
        }

        .sidebar-brand {
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.5px;
            padding-bottom: 24px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-brand .brand-dot {
            width: 8px;
            height: 8px;
            background: var(--primary);
            border-radius: 50%;
            display: inline-block;
            flex-shrink: 0;
        }

        .sidebar .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: rgba(255, 255, 255, 0.35);
            margin: 20px 0 8px 8px;
            font-weight: 500;
        }

        .sidebar .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: 8px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
            font-weight: 400;
            transition: var(--transition);
            cursor: pointer;
            margin-bottom: 2px;
        }
        .sidebar .nav-item:hover {
            background: rgba(255, 255, 255, 0.06);
            color: #fff;
        }
        .sidebar .nav-item.active {
            background: rgba(220, 38, 38, 0.2);
            color: #fff;
            font-weight: 500;
            border-left: 3px solid var(--primary);
        }
        .sidebar .nav-item .nav-icon {
            font-size: 1.1rem;
            width: 24px;
            text-align: center;
            flex-shrink: 0;
        }

        .main-content {
            margin-left: 240px;
            flex: 1;
            min-width: 0;
        }

        .page-banner {
            position: relative;
            background: var(--dark-bg);
            padding: 80px 0 60px;
            overflow: hidden;
        }
        .page-banner .banner-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.25;
            z-index: 0;
        }
        .page-banner .banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 58, 95, 0.7) 100%);
            z-index: 1;
        }
        .page-banner .container {
            position: relative;
            z-index: 2;
        }
        .page-banner h1 {
            font-size: 2.4rem;
            font-weight: 900;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .page-banner h1 .highlight {
            color: var(--primary);
        }
        .page-banner p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 640px;
            line-height: 1.8;
        }
        .page-banner .breadcrumb {
            display: flex;
            gap: 8px;
            align-items: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            margin-bottom: 20px;
        }
        .page-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.6);
        }
        .page-banner .breadcrumb a:hover {
            color: #fff;
        }
        .page-banner .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.3);
        }

        .section {
            padding: 64px 0;
        }
        .section-title {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-sub {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin-bottom: 40px;
            line-height: 1.7;
        }
        .section-title .accent-bar {
            display: inline-block;
            width: 40px;
            height: 4px;
            background: var(--primary);
            border-radius: 2px;
            margin-right: 14px;
            vertical-align: middle;
        }

        .card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--border-light);
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 20px 24px 24px;
        }
        .card-body .tag {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            font-size: 0.7rem;
            font-weight: 500;
            padding: 2px 12px;
            border-radius: 20px;
            margin-bottom: 10px;
            letter-spacing: 0.3px;
        }
        .card-body h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
            color: var(--text-primary);
        }
        .card-body h3 a:hover {
            color: var(--primary);
        }
        .card-body p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .card-body .meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 14px;
            padding-top: 14px;
            border-top: 1px solid var(--border-light);
        }

        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            cursor: pointer;
            border: none;
            background: var(--primary);
            color: #fff;
        }
        .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(220, 38, 38, 0.3);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.85rem;
        }
        .btn-accent {
            background: var(--accent);
        }
        .btn-accent:hover {
            background: var(--accent-light);
            box-shadow: 0 8px 24px rgba(30, 58, 95, 0.3);
        }

        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 500;
            background: var(--border-light);
            color: var(--text-secondary);
        }
        .badge-primary {
            background: rgba(220, 38, 38, 0.1);
            color: var(--primary);
        }
        .badge-accent {
            background: rgba(30, 58, 95, 0.1);
            color: var(--accent);
        }

        .stat-block {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin: 40px 0;
        }
        .stat-item {
            text-align: center;
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 28px 16px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .stat-item .num {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-item .label {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-top: 4px;
        }

        .faq-item {
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            padding: 20px 24px;
            margin-bottom: 12px;
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: var(--primary);
        }
        .faq-item .faq-q {
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-primary);
        }
        .faq-item .faq-q .icon {
            font-size: 1.2rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .faq-item.active .faq-q .icon {
            transform: rotate(45deg);
        }
        .faq-item .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.8;
        }
        .faq-item.active .faq-a {
            max-height: 300px;
            padding-top: 14px;
        }

        .cta-section {
            background: var(--dark-bg);
            padding: 72px 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section .cta-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 0;
        }
        .cta-section .cta-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 58, 95, 0.8) 100%);
            z-index: 1;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.7);
            max-width: 520px;
            margin: 0 auto 32px;
            font-size: 1.05rem;
        }

        .footer {
            background: #0a0f1a;
            padding: 48px 0 32px;
            color: rgba(255, 255, 255, 0.6);
        }
        .footer .footer-brand {
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer .footer-brand .brand-dot {
            width: 8px;
            height: 8px;
            background: var(--primary);
            border-radius: 50%;
            display: inline-block;
        }
        .footer .footer-desc {
            font-size: 0.9rem;
            max-width: 420px;
            margin-bottom: 20px;
            line-height: 1.7;
        }
        .footer .footer-links {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }
        .footer .footer-links a {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
        }
        .footer .footer-links a:hover {
            color: #fff;
        }
        .footer .footer-divider {
            border: none;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            margin: 20px 0 16px;
        }
        .footer .footer-copy {
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer .footer-copy a {
            color: rgba(255, 255, 255, 0.45);
        }
        .footer .footer-copy a:hover {
            color: #fff;
        }

        .mobile-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 200;
            background: var(--dark-bg);
            color: #fff;
            border: none;
            border-radius: 8px;
            padding: 10px 14px;
            font-size: 1.3rem;
            cursor: pointer;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
        }
        .mobile-toggle:hover {
            background: #1a2438;
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 99;
        }

        @media (max-width: 1024px) {
            .sidebar {
                transform: translateX(-100%);
                transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay.open {
                display: block;
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-toggle {
                display: block;
            }
            .page-banner {
                padding: 64px 0 48px;
            }
            .page-banner h1 {
                font-size: 1.8rem;
            }
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .stat-block {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .container {
                padding: 0 20px;
            }
        }

        @media (max-width: 640px) {
            .grid-3 {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .stat-block {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item .num {
                font-size: 1.6rem;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .page-banner p {
                font-size: 0.95rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .section-sub {
                font-size: 0.9rem;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .btn {
                padding: 10px 22px;
                font-size: 0.85rem;
            }
            .container {
                padding: 0 16px;
            }
            .card-body {
                padding: 16px 18px 20px;
            }
            .faq-item {
                padding: 16px 18px;
            }
            .footer {
                padding: 32px 0 24px;
            }
        }

        @media (max-width: 400px) {
            .stat-block {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .stat-item {
                padding: 16px 8px;
            }
            .stat-item .num {
                font-size: 1.3rem;
            }
            .stat-item .label {
                font-size: 0.75rem;
            }
            .page-banner h1 {
                font-size: 1.3rem;
            }
        }

        .topic-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .topic-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 20px;
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            cursor: pointer;
        }
        .topic-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-card);
            transform: translateX(4px);
        }
        .topic-item .topic-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(220, 38, 38, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--primary);
            flex-shrink: 0;
        }
        .topic-item .topic-info {
            flex: 1;
        }
        .topic-item .topic-info h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-primary);
        }
        .topic-item .topic-info p {
            font-size: 0.8rem;
            color: var(--text-secondary);
        }
        .topic-item .topic-arrow {
            color: var(--text-muted);
            font-size: 1rem;
        }
        .topic-item:hover .topic-arrow {
            color: var(--primary);
            transform: translateX(4px);
        }

        .feature-card {
            padding: 32px 28px;
            text-align: center;
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-6px);
        }
        .feature-card .fc-icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: rgba(220, 38, 38, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--primary);
            margin: 0 auto 18px;
        }
        .feature-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .feature-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .img-card {
            border-radius: var(--radius-lg);
            overflow: hidden;
            position: relative;
        }
        .img-card img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
        }
        .img-card .img-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15, 23, 42, 0.8) 0%, transparent 60%);
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 24px;
            color: #fff;
        }
        .img-card .img-overlay h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .img-card .img-overlay p {
            font-size: 0.85rem;
            opacity: 0.8;
        }

/* roulang page: article */
:root {
      --brand: #dc2626;
      --brand-hover: #b91c1c;
      --accent: #525252;
      --bg-deep: #0a0a0a;
      --bg-surface: #141414;
      --bg-card: #1a1a1a;
      --border-color: #2a2a2a;
      --text-primary: #f5f5f5;
      --text-secondary: #a3a3a3;
      --text-muted: #6b7280;
      --radius: 12px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.6);
      --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
      background: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.75;
      display: flex;
      min-height: 100vh;
    }
    a { color: inherit; text-decoration: none; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius); }
    button, input, textarea { font-family: inherit; outline: none; }
    ::selection { background: var(--brand); color: #fff; }

    .sidebar {
      width: 260px;
      min-height: 100vh;
      background: var(--bg-surface);
      border-right: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      position: fixed;
      top: 0;
      left: 0;
      z-index: 100;
      padding: 0 0 24px 0;
      transition: transform var(--transition);
    }
    .sidebar-brand {
      padding: 28px 24px 20px;
      font-size: 1.35rem;
      font-weight: 700;
      color: #fff;
      letter-spacing: 0.5px;
      border-bottom: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .sidebar-brand .brand-dot {
      width: 10px; height: 10px; border-radius: 50%; background: var(--brand); display: inline-block;
      animation: pulse-dot 2s infinite;
    }
    @keyframes pulse-dot { 0%,100% { opacity:1; } 50% { opacity:0.4; } }
    .sidebar-nav { padding: 16px 12px; flex:1; overflow-y:auto; }
    .nav-label {
      font-size: 0.7rem;
      text-transform: uppercase;
      letter-spacing: 1.2px;
      color: var(--text-muted);
      padding: 16px 12px 8px;
      font-weight: 600;
    }
    .nav-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 10px 16px;
      border-radius: 8px;
      color: var(--text-secondary);
      font-size: 0.95rem;
      font-weight: 500;
      transition: var(--transition);
      margin-bottom: 2px;
    }
    .nav-item:hover { background: rgba(220,38,38,0.1); color: #fff; }
    .nav-item.active { background: rgba(220,38,38,0.18); color: var(--brand); font-weight: 600; }
    .nav-icon { font-size: 1.1rem; width: 24px; text-align: center; }

    .main-wrapper {
      margin-left: 260px;
      flex: 1;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    .mobile-header {
      display: none;
      background: var(--bg-surface);
      border-bottom: 1px solid var(--border-color);
      padding: 12px 20px;
      align-items: center;
      justify-content: space-between;
      position: sticky;
      top: 0;
      z-index: 99;
    }
    .mobile-header .mobile-brand { font-weight: 700; color: #fff; font-size: 1.1rem; }
    .menu-toggle {
      background: none; border: none; color: #fff; font-size: 1.6rem; cursor: pointer;
      padding: 4px 8px; border-radius: 6px; transition: var(--transition);
    }
    .menu-toggle:hover { background: rgba(255,255,255,0.08); }

    .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

    main { flex: 1; padding: 0 0 48px 0; }

    .article-hero {
      position: relative;
      padding: 48px 0 32px;
      background: linear-gradient(180deg, rgba(220,38,38,0.06) 0%, transparent 100%);
      border-bottom: 1px solid var(--border-color);
    }
    .article-hero .breadcrumb {
      display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 24px; flex-wrap: wrap;
    }
    .article-hero .breadcrumb a { color: var(--text-secondary); }
    .article-hero .breadcrumb a:hover { color: var(--brand); }
    .article-hero .breadcrumb .sep { color: var(--text-muted); }
    .article-hero .breadcrumb .current { color: var(--text-primary); }
    .article-hero .cat-badge {
      display: inline-block;
      background: rgba(220,38,38,0.2);
      color: var(--brand);
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 14px;
      border-radius: 20px;
      letter-spacing: 0.5px;
      margin-bottom: 16px;
    }
    .article-hero h1 {
      font-size: 2.4rem;
      font-weight: 700;
      line-height: 1.3;
      color: #fff;
      margin-bottom: 16px;
      max-width: 900px;
    }
    .article-hero .meta {
      display: flex; flex-wrap: wrap; gap: 16px 28px; color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 24px;
    }
    .article-hero .meta span { display: flex; align-items: center; gap: 6px; }
    .article-hero .meta i { color: var(--text-muted); font-size: 0.8rem; }
    .article-hero .summary {
      font-size: 1.1rem; color: var(--text-secondary); max-width: 800px; line-height: 1.7;
      padding: 16px 0 0; border-top: 1px solid var(--border-color);
    }
    .article-hero .cover-wrap {
      margin-top: 32px;
      border-radius: var(--radius);
      overflow: hidden;
      max-height: 480px;
      background: var(--bg-card);
    }
    .article-hero .cover-wrap img { width: 100%; height: 100%; object-fit: cover; }

    .article-body {
      padding: 48px 0;
    }
    .article-body .content {
      max-width: 860px;
      font-size: 1.05rem;
      line-height: 1.9;
      color: var(--text-primary);
    }
    .article-body .content p { margin-bottom: 1.2em; }
    .article-body .content h2 { font-size: 1.6rem; font-weight: 700; margin: 2em 0 0.8em; color: #fff; }
    .article-body .content h3 { font-size: 1.25rem; font-weight: 600; margin: 1.6em 0 0.6em; color: #fff; }
    .article-body .content ul, .article-body .content ol { padding-left: 1.6em; margin-bottom: 1.2em; }
    .article-body .content li { margin-bottom: 0.4em; }
    .article-body .content a { color: var(--brand); border-bottom: 1px solid rgba(220,38,38,0.3); }
    .article-body .content a:hover { border-bottom-color: var(--brand); }
    .article-body .content blockquote {
      border-left: 4px solid var(--brand);
      background: rgba(220,38,38,0.06);
      padding: 16px 24px;
      margin: 1.6em 0;
      border-radius: 0 var(--radius) var(--radius) 0;
      color: var(--text-secondary);
    }
    .article-body .content img { border-radius: var(--radius); margin: 1.6em 0; }

    .key-points {
      padding: 40px 0;
      background: var(--bg-surface);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .key-points .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
    .key-points .point-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px 20px;
      transition: var(--transition);
    }
    .key-points .point-card:hover { border-color: rgba(220,38,38,0.3); transform: translateY(-2px); box-shadow: var(--shadow-card); }
    .key-points .point-card .icon { font-size: 1.8rem; color: var(--brand); margin-bottom: 12px; }
    .key-points .point-card h4 { font-size: 1.05rem; font-weight: 600; color: #fff; margin-bottom: 8px; }
    .key-points .point-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

    .related-section {
      padding: 48px 0;
    }
    .related-section .section-title {
      font-size: 1.5rem; font-weight: 700; color: #fff; margin-bottom: 28px; display: flex; align-items: center; gap: 12px;
    }
    .related-section .section-title .accent-line { width: 40px; height: 3px; background: var(--brand); border-radius: 2px; }
    .related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
    .related-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      transition: var(--transition);
      display: flex; flex-direction: column;
    }
    .related-card:hover { transform: translateY(-3px); border-color: rgba(220,38,38,0.25); box-shadow: var(--shadow-card); }
    .related-card .thumb { height: 160px; overflow: hidden; background: var(--bg-surface); }
    .related-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
    .related-card:hover .thumb img { transform: scale(1.05); }
    .related-card .info { padding: 16px 18px 18px; flex: 1; display: flex; flex-direction: column; }
    .related-card .info .rcat { font-size: 0.7rem; color: var(--brand); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 6px; }
    .related-card .info h4 { font-size: 1rem; font-weight: 600; color: #fff; line-height: 1.4; margin-bottom: 8px; }
    .related-card .info p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; flex: 1; }
    .related-card .info .rmeta { font-size: 0.75rem; color: var(--text-muted); margin-top: 12px; display: flex; align-items: center; gap: 8px; }

    .cta-block {
      padding: 56px 0;
      background: linear-gradient(135deg, rgba(220,38,38,0.08) 0%, rgba(20,20,20,1) 70%);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .cta-block .cta-inner {
      max-width: 700px; margin: 0 auto; text-align: center;
    }
    .cta-block h3 { font-size: 1.8rem; font-weight: 700; color: #fff; margin-bottom: 12px; }
    .cta-block p { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 28px; }
    .cta-block .btn-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

    .faq-block {
      padding: 48px 0;
    }
    .faq-block .section-title { font-size: 1.5rem; font-weight: 700; color: #fff; margin-bottom: 28px; display: flex; align-items: center; gap: 12px; }
    .faq-block .section-title .accent-line { width: 40px; height: 3px; background: var(--brand); border-radius: 2px; }
    .faq-list { max-width: 800px; display: flex; flex-direction: column; gap: 12px; }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 0;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item:hover { border-color: rgba(220,38,38,0.2); }
    .faq-question {
      padding: 18px 20px;
      display: flex; align-items: center; justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
      color: #fff;
      font-size: 0.95rem;
      transition: var(--transition);
      user-select: none;
    }
    .faq-question:hover { background: rgba(220,38,38,0.05); }
    .faq-question .faq-toggle { font-size: 0.9rem; color: var(--text-muted); transition: var(--transition); }
    .faq-item.open .faq-toggle { transform: rotate(180deg); color: var(--brand); }
    .faq-answer {
      padding: 0 20px 18px;
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.7;
      display: none;
    }
    .faq-item.open .faq-answer { display: block; }

    .footer {
      background: var(--bg-surface);
      border-top: 1px solid var(--border-color);
      padding: 40px 0 32px;
      margin-top: auto;
    }
    .footer .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
    .footer-brand { font-size: 1.2rem; font-weight: 700; color: #fff; margin-bottom: 8px; }
    .footer-desc { font-size: 0.9rem; color: var(--text-secondary); max-width: 480px; line-height: 1.7; margin-bottom: 18px; }
    .footer-links { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 20px; }
    .footer-links a { font-size: 0.9rem; color: var(--text-secondary); }
    .footer-links a:hover { color: var(--brand); }
    .footer-divider { border: none; border-top: 1px solid var(--border-color); margin: 16px 0 20px; }
    .footer-copy { font-size: 0.8rem; color: var(--text-muted); }

    .btn {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 10px 28px; border-radius: 8px; font-weight: 600; font-size: 0.95rem;
      transition: var(--transition); cursor: pointer; border: none; line-height: 1.4;
    }
    .btn-primary { background: var(--brand); color: #fff; }
    .btn-primary:hover { background: var(--brand-hover); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(220,38,38,0.35); }
    .btn-outline { background: transparent; color: var(--text-primary); border: 1px solid var(--border-color); }
    .btn-outline:hover { border-color: var(--brand); color: var(--brand); background: rgba(220,38,38,0.06); }

    .not-found {
      padding: 80px 0; text-align: center;
    }
    .not-found .nf-icon { font-size: 4rem; color: var(--text-muted); margin-bottom: 20px; }
    .not-found h2 { font-size: 1.8rem; color: #fff; margin-bottom: 12px; }
    .not-found p { color: var(--text-secondary); margin-bottom: 24px; }

    /* overlay */
    .sidebar-overlay {
      display: none;
      position: fixed;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(0,0,0,0.6);
      z-index: 89;
    }

    @media (max-width: 1024px) {
      .sidebar { transform: translateX(-100%); }
      .sidebar.open { transform: translateX(0); }
      .sidebar-overlay.active { display: block; }
      .main-wrapper { margin-left: 0; }
      .mobile-header { display: flex; }
      .article-hero h1 { font-size: 1.8rem; }
    }
    @media (max-width: 768px) {
      .container { padding: 0 16px; }
      .article-hero { padding: 32px 0 24px; }
      .article-hero h1 { font-size: 1.5rem; }
      .article-hero .meta { gap: 10px 16px; font-size: 0.8rem; }
      .article-hero .summary { font-size: 0.95rem; }
      .article-body .content { font-size: 0.95rem; }
      .key-points .grid { grid-template-columns: 1fr; }
      .related-grid { grid-template-columns: 1fr; }
      .cta-block h3 { font-size: 1.4rem; }
      .faq-question { font-size: 0.9rem; padding: 14px 16px; }
      .footer { padding: 32px 0 24px; }
    }
    @media (max-width: 520px) {
      .article-hero h1 { font-size: 1.25rem; }
      .article-hero .breadcrumb { font-size: 0.75rem; }
      .btn { padding: 8px 20px; font-size: 0.85rem; }
      .cta-block .btn-group { flex-direction: column; align-items: center; }
    }