/* roulang page: index */
/* ===== CSS 设计变量 ===== */
:root {
  --color-primary: #1e40af;
  --color-primary-light: #2563eb;
  --color-primary-dark: #1e3a8a;
  --color-secondary: #0d9488;
  --color-secondary-light: #14b8a6;
  --color-accent: #f59e0b;
  --color-bg: #f8fafc;
  --color-bg-alt: #f1f5f9;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-light: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-success: #10b981;
  --color-error: #ef4444;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 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), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 36px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
  --shadow-xl: 0 24px 48px rgba(0,0,0,0.12);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-width: 260px;
  --header-h: 0px;
}
/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  display: flex;
  min-height: 100vh;
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-light); }
a:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea, select { font-family: inherit; font-size: 1rem; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 600; color: var(--color-text); }
/* ===== 左侧导航 ===== */
.sidebar {
  position: fixed; top: 0; left: 0; width: var(--nav-width); height: 100vh;
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  color: #e2e8f0; z-index: 1000;
  display: flex; flex-direction: column; padding: 0; overflow-y: auto;
  border-right: 1px solid rgba(255,255,255,0.06);
  transition: transform var(--transition);
}
.sidebar-brand {
  padding: 28px 24px 20px; border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sidebar-brand .logo {
  font-size: 1.5rem; font-weight: 700; color: #ffffff; letter-spacing: -0.02em;
  display: flex; align-items: center; gap: 10px;
}
.sidebar-brand .logo i { color: var(--color-secondary-light); font-size: 1.6rem; }
.sidebar-brand .logo span { background: linear-gradient(135deg, #f8fafc 0%, #94a3b8 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.sidebar-nav { padding: 16px 0; flex: 1; }
.sidebar-nav .nav-item { display: block; }
.sidebar-nav .nav-link {
  display: flex; align-items: center; gap: 14px; padding: 12px 24px;
  color: #94a3b8; font-size: 0.95rem; font-weight: 500;
  transition: all var(--transition); border-left: 3px solid transparent;
  text-decoration: none;
}
.sidebar-nav .nav-link i { width: 20px; text-align: center; font-size: 1.1rem; }
.sidebar-nav .nav-link:hover { color: #ffffff; background: rgba(255,255,255,0.06); border-left-color: var(--color-secondary); }
.sidebar-nav .nav-link.active { color: #ffffff; background: rgba(255,255,255,0.08); border-left-color: var(--color-secondary-light); font-weight: 600; }
.sidebar-footer {
  padding: 20px 24px; border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 0.8rem; color: #64748b; text-align: center;
}
/* ===== 主内容区 ===== */
.main-content {
  margin-left: var(--nav-width); flex: 1; min-height: 100vh;
  display: flex; flex-direction: column; width: calc(100% - var(--nav-width));
}
/* ===== 容器 ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; width: 100%; }
/* ===== 板块通用 ===== */
.section { padding: 72px 0; }
.section-alt { background: var(--color-bg-alt); }
.section-title {
  font-size: 2rem; font-weight: 700; text-align: center; margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.section-subtitle {
  text-align: center; color: var(--color-text-secondary); font-size: 1.1rem;
  max-width: 640px; margin: 0 auto 48px; line-height: 1.6;
}
/* ===== Hero ===== */
.hero {
  position: relative; padding: 120px 0 100px; overflow: hidden;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 70%, #1e3a8a 100%);
}
.hero-bg {
  position: absolute; inset: 0; opacity: 0.25; z-index: 0;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
}
.hero .container { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-content h1 {
  font-size: 3rem; font-weight: 800; color: #ffffff; line-height: 1.15;
  letter-spacing: -0.02em; margin-bottom: 20px;
}
.hero-content h1 span { color: var(--color-secondary-light); }
.hero-content p {
  font-size: 1.15rem; color: #94a3b8; line-height: 1.7; margin-bottom: 32px;
  max-width: 520px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 10px; padding: 14px 32px;
  font-weight: 600; font-size: 1rem; border: none; border-radius: var(--radius-md);
  cursor: pointer; transition: all var(--transition); text-decoration: none;
  line-height: 1.2;
}
.btn-primary { background: var(--color-primary-light); color: #ffffff; }
.btn-primary:hover { background: var(--color-primary); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.35); color: #fff; }
.btn-secondary { background: rgba(255,255,255,0.10); color: #ffffff; border: 1px solid rgba(255,255,255,0.18); }
.btn-secondary:hover { background: rgba(255,255,255,0.18); transform: translateY(-2px); color: #fff; }
.hero-image { display: flex; justify-content: center; align-items: center; }
.hero-image img { border-radius: var(--radius-lg); box-shadow: var(--shadow-xl); max-height: 420px; object-fit: cover; width: 100%; }
/* ===== 品牌介绍 ===== */
.brand-intro { text-align: center; max-width: 800px; margin: 0 auto; }
.brand-intro .brand-icon { font-size: 3rem; color: var(--color-primary); margin-bottom: 16px; }
.brand-intro h2 { font-size: 2rem; margin-bottom: 16px; }
.brand-intro p { color: var(--color-text-secondary); font-size: 1.1rem; line-height: 1.8; }
.brand-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin-top: 48px; }
.stat-card { text-align: center; padding: 32px 16px; background: var(--color-surface); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); transition: all var(--transition); }
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.stat-card .num { font-size: 2.4rem; font-weight: 800; color: var(--color-primary); }
.stat-card .label { color: var(--color-text-secondary); margin-top: 6px; font-size: 0.95rem; }
/* ===== 分类入口 ===== */
.category-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.category-card {
  background: var(--color-surface); border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm); border: 1px solid var(--color-border);
  overflow: hidden; transition: all var(--transition); display: block; text-decoration: none; color: inherit;
}
.category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.category-card .card-img { height: 180px; overflow: hidden; }
.category-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.category-card:hover .card-img img { transform: scale(1.05); }
.category-card .card-body { padding: 24px; }
.category-card .card-body h3 { font-size: 1.25rem; margin-bottom: 8px; }
.category-card .card-body p { color: var(--color-text-secondary); font-size: 0.95rem; line-height: 1.6; }
.category-card .card-tag { display: inline-block; padding: 4px 12px; background: var(--color-bg-alt); border-radius: 20px; font-size: 0.8rem; color: var(--color-text-secondary); margin-top: 12px; }
/* ===== 最新资讯 ===== */
.post-list { display: grid; grid-template-columns: 1fr; gap: 20px; }
.post-item {
  display: grid; grid-template-columns: 200px 1fr; gap: 24px;
  background: var(--color-surface); border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm); border: 1px solid var(--color-border);
  overflow: hidden; transition: all var(--transition); padding: 0;
}
.post-item:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.post-item .post-img { height: 100%; min-height: 160px; overflow: hidden; }
.post-item .post-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.post-item:hover .post-img img { transform: scale(1.03); }
.post-item .post-body { padding: 24px 24px 24px 0; display: flex; flex-direction: column; justify-content: center; }
.post-item .post-body .post-cat { display: inline-block; padding: 3px 12px; background: var(--color-primary-light); color: #fff; border-radius: 20px; font-size: 0.75rem; font-weight: 500; margin-bottom: 8px; width: fit-content; }
.post-item .post-body h3 { font-size: 1.2rem; margin-bottom: 8px; }
.post-item .post-body h3 a { color: var(--color-text); text-decoration: none; }
.post-item .post-body h3 a:hover { color: var(--color-primary); }
.post-item .post-body .post-excerpt { color: var(--color-text-secondary); font-size: 0.95rem; line-height: 1.6; margin-bottom: 12px; }
.post-item .post-body .post-meta { display: flex; gap: 16px; font-size: 0.85rem; color: var(--color-text-light); }
.post-empty { text-align: center; padding: 48px 24px; color: var(--color-text-secondary); background: var(--color-surface); border-radius: var(--radius-md); border: 1px dashed var(--color-border); }
/* ===== 特色服务 ===== */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 28px; }
.feature-card { text-align: center; padding: 36px 24px; background: var(--color-surface); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); transition: all var(--transition); }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.feature-card .icon { font-size: 2.5rem; color: var(--color-primary); margin-bottom: 16px; }
.feature-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.feature-card p { color: var(--color-text-secondary); font-size: 0.95rem; line-height: 1.6; }
/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--color-surface); border-radius: var(--radius-md); border: 1px solid var(--color-border); overflow: hidden; transition: all var(--transition); }
.faq-item summary { padding: 20px 24px; font-weight: 600; font-size: 1.05rem; cursor: pointer; display: flex; align-items: center; gap: 12px; transition: background var(--transition); list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary i { color: var(--color-primary); font-size: 1.1rem; transition: transform var(--transition); }
.faq-item[open] summary i { transform: rotate(90deg); }
.faq-item[open] summary { background: var(--color-bg-alt); }
.faq-item .faq-answer { padding: 0 24px 20px; color: var(--color-text-secondary); line-height: 1.7; font-size: 0.95rem; }
/* ===== CTA ===== */
.cta-section { background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%); padding: 72px 0; text-align: center; color: #ffffff; }
.cta-section h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 16px; color: #fff; }
.cta-section p { font-size: 1.1rem; opacity: 0.85; margin-bottom: 32px; max-width: 600px; margin-left: auto; margin-right: auto; }
.cta-section .btn-primary { background: #ffffff; color: var(--color-primary); }
.cta-section .btn-primary:hover { background: #e2e8f0; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.20); color: var(--color-primary-dark); }
/* ===== 页脚 ===== */
.footer { background: #0f172a; color: #94a3b8; padding: 48px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand .logo { font-size: 1.3rem; font-weight: 700; color: #ffffff; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.footer-brand .logo i { color: var(--color-secondary-light); }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 320px; }
.footer-col h4 { color: #ffffff; font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #94a3b8; font-size: 0.9rem; transition: color var(--transition); }
.footer-col ul li a:hover { color: #ffffff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); margin-top: 40px; padding-top: 24px; text-align: center; font-size: 0.85rem; color: #64748b; }
/* ===== 移动端导航切换 ===== */
.nav-toggle { display: none; position: fixed; top: 16px; left: 16px; z-index: 1100; background: var(--color-primary); color: #fff; border: none; border-radius: var(--radius-sm); padding: 10px 14px; font-size: 1.3rem; cursor: pointer; box-shadow: var(--shadow-md); }
.nav-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 999; }
/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .hero-content p { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .post-item { grid-template-columns: 1fr; }
  .post-item .post-img { height: 200px; }
  .post-item .post-body { padding: 20px; }
}
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-overlay.active { display: block; }
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; width: 100%; }
  .container { padding: 0 20px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.6rem; }
  .hero { padding: 80px 0 60px; }
  .hero-content h1 { font-size: 2rem; }
  .brand-stats { grid-template-columns: 1fr; gap: 16px; }
  .category-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .post-item .post-img { height: 180px; }
}
@media (max-width: 520px) {
  .hero-content h1 { font-size: 1.6rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
  .section-title { font-size: 1.35rem; }
  .stat-card .num { font-size: 1.8rem; }
}

/* ===== 复用首页设计变量与基础样式 ===== */
:root {
  --color-primary: #1e40af; --color-primary-light: #2563eb; --color-primary-dark: #1e3a8a;
  --color-secondary: #0d9488; --color-secondary-light: #14b8a6; --color-accent: #f59e0b;
  --color-bg: #f8fafc; --color-bg-alt: #f1f5f9; --color-surface: #ffffff;
  --color-text: #1e293b; --color-text-secondary: #64748b; --color-text-light: #94a3b8;
  --color-border: #e2e8f0; --color-border-light: #f1f5f9;
  --radius-sm: 6px; --radius-md: 12px; --radius-lg: 20px; --radius-xl: 28px;
  --shadow-sm: 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), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 36px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-width: 260px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans); font-size: 16px; line-height: 1.7;
  color: var(--color-text); background: var(--color-bg);
  display: flex; min-height: 100vh;
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-light); }
a:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea, select { font-family: inherit; font-size: 1rem; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 600; color: var(--color-text); }
/* ===== 左侧导航 ===== */
.sidebar {
  position: fixed; top: 0; left: 0; width: var(--nav-width); height: 100vh;
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  color: #e2e8f0; z-index: 1000;
  display: flex; flex-direction: column; padding: 0; overflow-y: auto;
  border-right: 1px solid rgba(255,255,255,0.06);
  transition: transform var(--transition);
}
.sidebar-brand { padding: 28px 24px 20px; border-bottom: 1px solid rgba(255,255,255,0.06); }
.sidebar-brand .logo { font-size: 1.5rem; font-weight: 700; color: #ffffff; display: flex; align-items: center; gap: 10px; }
.sidebar-brand .logo i { color: var(--color-secondary-light); font-size: 1.6rem; }
.sidebar-brand .logo span { background: linear-gradient(135deg, #f8fafc 0%, #94a3b8 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.sidebar-nav { padding: 16px 0; flex: 1; }
.sidebar-nav .nav-link {
  display: flex; align-items: center; gap: 14px; padding: 12px 24px;
  color: #94a3b8; font-size: 0.95rem; font-weight: 500;
  transition: all var(--transition); border-left: 3px solid transparent;
  text-decoration: none;
}
.sidebar-nav .nav-link i { width: 20px; text-align: center; font-size: 1.1rem; }
.sidebar-nav .nav-link:hover { color: #ffffff; background: rgba(255,255,255,0.06); border-left-color: var(--color-secondary); }
.sidebar-nav .nav-link.active { color: #ffffff; background: rgba(255,255,255,0.08); border-left-color: var(--color-secondary-light); font-weight: 600; }
.sidebar-footer { padding: 20px 24px; border-top: 1px solid rgba(255,255,255,0.06); font-size: 0.8rem; color: #64748b; text-align: center; }
/* ===== 主内容区 ===== */
.main-content { margin-left: var(--nav-width); flex: 1; min-height: 100vh; display: flex; flex-direction: column; width: calc(100% - var(--nav-width)); }
.container { max-width: 800px; margin: 0 auto; padding: 0 32px; width: 100%; }
/* ===== 文章页 ===== */
.article-header { padding: 48px 0 24px; }
.article-header .breadcrumb { display: flex; gap: 8px; align-items: center; font-size: 0.9rem; color: var(--color-text-secondary); margin-bottom: 20px; }
.article-header .breadcrumb a { color: var(--color-text-secondary); }
.article-header .breadcrumb a:hover { color: var(--color-primary); }
.article-header .breadcrumb .sep { color: var(--color-text-light); }
.article-header h1 { font-size: 2.2rem; font-weight: 700; line-height: 1.25; margin-bottom: 16px; letter-spacing: -0.01em; }
.article-header .meta { display: flex; gap: 20px; flex-wrap: wrap; color: var(--color-text-secondary); font-size: 0.9rem; }
.article-header .meta span i { margin-right: 6px; }
.article-header .meta .cat { display: inline-block; padding: 3px 14px; background: var(--color-primary-light); color: #fff; border-radius: 20px; font-size: 0.8rem; font-weight: 500; }
.article-body { padding: 32px 0 48px; }
.article-body .content { font-size: 1.05rem; line-height: 1.85; color: var(--color-text); }
.article-body .content p { margin-bottom: 20px; }
.article-body .content h2, .article-body .content h3 { margin-top: 32px; margin-bottom: 12px; }
.article-body .content ul, .article-body .content ol { margin-bottom: 20px; padding-left: 24px; }
.article-body .content li { margin-bottom: 8px; list-style: disc; }
.article-body .content img { border-radius: var(--radius-md); margin: 24px 0; box-shadow: var(--shadow-sm); }
.article-body .content blockquote { border-left: 4px solid var(--color-primary); padding: 16px 20px; background: var(--color-bg-alt); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin-bottom: 20px; color: var(--color-text-secondary); }
.article-body .content a { color: var(--color-primary); text-decoration: underline; }
.article-footer { padding: 24px 0 48px; border-top: 1px solid var(--color-border); }
.article-footer .back-link { display: inline-flex; align-items: center; gap: 8px; color: var(--color-text-secondary); font-size: 0.95rem; }
.article-footer .back-link:hover { color: var(--color-primary); }
/* 文章未找到 */
.not-found { text-align: center; padding: 80px 20px; }
.not-found i { font-size: 3rem; color: var(--color-text-light); margin-bottom: 20px; display: block; }
.not-found h2 { font-size: 1.8rem; margin-bottom: 12px; }
.not-found p { color: var(--color-text-secondary); margin-bottom: 24px; }
.not-found .btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; background: var(--color-primary-light); color: #fff; border-radius: var(--radius-md); font-weight: 600; text-decoration: none; }
.not-found .btn:hover { background: var(--color-primary); color: #fff; }
/* 页脚 */
.footer { background: #0f172a; color: #94a3b8; padding: 48px 0 32px; margin-top: auto; }
.footer .container { max-width: 1200px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand .logo { font-size: 1.3rem; font-weight: 700; color: #ffffff; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.footer-brand .logo i { color: var(--color-secondary-light); }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 320px; }
.footer-col h4 { color: #ffffff; font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #94a3b8; font-size: 0.9rem; }
.footer-col ul li a:hover { color: #ffffff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); margin-top: 40px; padding-top: 24px; text-align: center; font-size: 0.85rem; color: #64748b; }
/* 移动端 */
.nav-toggle { display: none; position: fixed; top: 16px; left: 16px; z-index: 1100; background: var(--color-primary); color: #fff; border: none; border-radius: var(--radius-sm); padding: 10px 14px; font-size: 1.3rem; cursor: pointer; box-shadow: var(--shadow-md); }
.nav-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 999; }
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-overlay.active { display: block; }
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; width: 100%; }
  .container { padding: 0 20px; }
  .article-header h1 { font-size: 1.6rem; }
  .article-body .content { font-size: 1rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 520px) {
  .article-header h1 { font-size: 1.35rem; }
  .article-header .meta { flex-direction: column; gap: 8px; }
}

/* ===== 复用首页完整设计系统 ===== */
:root {
  --color-primary: #1e40af; --color-primary-light: #2563eb; --color-primary-dark: #1e3a8a;
  --color-secondary: #0d9488; --color-secondary-light: #14b8a6; --color-accent: #f59e0b;
  --color-bg: #f8fafc; --color-bg-alt: #f1f5f9; --color-surface: #ffffff;
  --color-text: #1e293b; --color-text-secondary: #64748b; --color-text-light: #94a3b8;
  --color-border: #e2e8f0; --color-border-light: #f1f5f9;
  --radius-sm: 6px; --radius-md: 12px; --radius-lg: 20px; --radius-xl: 28px;
  --shadow-sm: 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), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 36px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
  --shadow-xl: 0 24px 48px rgba(0,0,0,0.12);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-width: 260px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans); font-size: 16px; line-height: 1.7;
  color: var(--color-text); background: var(--color-bg);
  display: flex; min-height: 100vh;
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-light); }
a:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea, select { font-family: inherit; font-size: 1rem; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 600; color: var(--color-text); }
/* ===== 左侧导航 ===== */
.sidebar {
  position: fixed; top: 0; left: 0; width: var(--nav-width); height: 100vh;
  background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
  color: #e2e8f0; z-index: 1000;
  display: flex; flex-direction: column; padding: 0; overflow-y: auto;
  border-right: 1px solid rgba(255,255,255,0.06);
  transition: transform var(--transition);
}
.sidebar-brand { padding: 28px 24px 20px; border-bottom: 1px solid rgba(255,255,255,0.06); }
.sidebar-brand .logo { font-size: 1.5rem; font-weight: 700; color: #ffffff; display: flex; align-items: center; gap: 10px; }
.sidebar-brand .logo i { color: var(--color-secondary-light); font-size: 1.6rem; }
.sidebar-brand .logo span { background: linear-gradient(135deg, #f8fafc 0%, #94a3b8 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.sidebar-nav { padding: 16px 0; flex: 1; }
.sidebar-nav .nav-link {
  display: flex; align-items: center; gap: 14px; padding: 12px 24px;
  color: #94a3b8; font-size: 0.95rem; font-weight: 500;
  transition: all var(--transition); border-left: 3px solid transparent;
  text-decoration: none;
}
.sidebar-nav .nav-link i { width: 20px; text-align: center; font-size: 1.1rem; }
.sidebar-nav .nav-link:hover { color: #ffffff; background: rgba(255,255,255,0.06); border-left-color: var(--color-secondary); }
.sidebar-nav .nav-link.active { color: #ffffff; background: rgba(255,255,255,0.08); border-left-color: var(--color-secondary-light); font-weight: 600; }
.sidebar-footer { padding: 20px 24px; border-top: 1px solid rgba(255,255,255,0.06); font-size: 0.8rem; color: #64748b; text-align: center; }
/* ===== 主内容区 ===== */
.main-content { margin-left: var(--nav-width); flex: 1; min-height: 100vh; display: flex; flex-direction: column; width: calc(100% - var(--nav-width)); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; width: 100%; }
.section { padding: 64px 0; }
.section-alt { background: var(--color-bg-alt); }
.section-title { font-size: 2rem; font-weight: 700; text-align: center; margin-bottom: 12px; letter-spacing: -0.01em; }
.section-subtitle { text-align: center; color: var(--color-text-secondary); font-size: 1.1rem; max-width: 640px; margin: 0 auto 40px; line-height: 1.6; }
/* ===== Banner ===== */
.cat-banner {
  position: relative; padding: 80px 0 72px; overflow: hidden;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 60%, #1e3a8a 100%);
}
.cat-banner-bg { position: absolute; inset: 0; opacity: 0.20; z-index: 0; background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat; }
.cat-banner .container { position: relative; z-index: 1; text-align: center; }
.cat-banner h1 { font-size: 2.6rem; font-weight: 800; color: #ffffff; margin-bottom: 16px; letter-spacing: -0.02em; }
.cat-banner h1 i { color: var(--color-secondary-light); margin-right: 12px; }
.cat-banner p { font-size: 1.15rem; color: #94a3b8; max-width: 600px; margin: 0 auto; line-height: 1.7; }
/* ===== 分类内容卡片 ===== */
.content-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.content-card {
  background: var(--color-surface); border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm); border: 1px solid var(--color-border);
  overflow: hidden; transition: all var(--transition); display: flex; flex-direction: column;
}
.content-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.content-card .card-img { height: 180px; overflow: hidden; }
.content-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.content-card:hover .card-img img { transform: scale(1.05); }
.content-card .card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.content-card .card-body .tag { display: inline-block; padding: 3px 12px; background: var(--color-bg-alt); border-radius: 20px; font-size: 0.75rem; color: var(--color-text-secondary); margin-bottom: 10px; width: fit-content; }
.content-card .card-body h3 { font-size: 1.15rem; margin-bottom: 8px; }
.content-card .card-body p { color: var(--color-text-secondary); font-size: 0.95rem; line-height: 1.6; flex: 1; }
.content-card .card-body .card-link { margin-top: 16px; color: var(--color-primary); font-weight: 600; font-size: 0.9rem; display: flex; align-items: center; gap: 6px; }
.content-card .card-body .card-link:hover { gap: 10px; }
/* ===== 选购步骤 ===== */
.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 28px; counter-reset: step; }
.step-card { text-align: center; padding: 36px 20px; background: var(--color-surface); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); border: 1px solid var(--color-border); position: relative; transition: all var(--transition); }
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.step-card .step-num { width: 48px; height: 48px; border-radius: 50%; background: var(--color-primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; font-weight: 700; margin: 0 auto 16px; }
.step-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.step-card p { color: var(--color-text-secondary); font-size: 0.95rem; line-height: 1.6; }
/* ===== 对比表格 ===== */
.compare-wrapper { overflow-x: auto; }
.compare-table { width: 100%; border-collapse: collapse; background: var(--color-surface); border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-sm); }
.compare-table th, .compare-table td { padding: 14px 20px; text-align: left; border-bottom: 1px solid var(--color-border); font-size: 0.95rem; }
.compare-table th { background: var(--color-bg-alt); font-weight: 600; color: var(--color-text); }
.compare-table tr:hover td { background: var(--color-bg-alt); }
.compare-table .highlight { color: var(--color-primary); font-weight: 600; }
/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item { background: var(--color-surface); border-radius: var(--radius-md); border: 1px solid var(--color-border); overflow: hidden; }
.faq-item summary { padding: 20px 24px; font-weight: 600; font-size: 1.05rem; cursor: pointer; display: flex; align-items: center; gap: 12px; transition: background var(--transition); list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary i { color: var(--color-primary); font-size: 1.1rem; transition: transform var(--transition); }
.faq-item[open] summary i { transform: rotate(90deg); }
.faq-item[open] summary { background: var(--color-bg-alt); }
.faq-item .faq-answer { padding: 0 24px 20px; color: var(--color-text-secondary); line-height: 1.7; font-size: 0.95rem; }
/* ===== CTA ===== */
.cta-section { background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%); padding: 64px 0; text-align: center; color: #ffffff; }
.cta-section h2 { font-size: 2rem; font-weight: 700; margin-bottom: 16px; color: #fff; }
.cta-section p { font-size: 1.1rem; opacity: 0.85; margin-bottom: 28px; max-width: 500px; margin-left: auto; margin-right: auto; }
.cta-section .btn-primary { background: #ffffff; color: var(--color-primary); padding: 14px 36px; border-radius: var(--radius-md); font-weight: 600; display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.cta-section .btn-primary:hover { background: #e2e8f0; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.20); color: var(--color-primary-dark); }
/* ===== 页脚 ===== */
.footer { background: #0f172a; color: #94a3b8; padding: 48px 0 32px; margin-top: auto; }
.footer .container { max-width: 1200px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand .logo { font-size: 1.3rem; font-weight: 700; color: #ffffff; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.footer-brand .logo i { color: var(--color-secondary-light); }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 320px; }
.footer-col h4 { color: #ffffff; font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #94a3b8; font-size: 0.9rem; }
.footer-col ul li a:hover { color: #ffffff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); margin-top: 40px; padding-top: 24px; text-align: center; font-size: 0.85rem; color: #64748b; }
/* ===== 移动端 ===== */
.nav-toggle { display: none; position: fixed; top: 16px; left: 16px; z-index: 1100; background: var(--color-primary); color: #fff; border: none; border-radius: var(--radius-sm); padding: 10px 14px; font-size: 1.3rem; cursor: pointer; box-shadow: var(--shadow-md); }
.nav-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 999; }
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-overlay.active { display: block; }
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; width: 100%; }
  .container { padding: 0 20px; }
  .section { padding: 40px 0; }
  .section-title { font-size: 1.5rem; }
  .cat-banner h1 { font-size: 1.8rem; }
  .cat-banner { padding: 56px 0 48px; }
  .content-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 520px) {
  .cat-banner h1 { font-size: 1.4rem; }
  .section-title { font-size: 1.3rem; }
  .compare-table th, .compare-table td { padding: 10px 12px; font-size: 0.85rem; }
}

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #0f172a;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #1e293b;
            --text-light: #64748b;
            --text-lighter: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --sidebar-width: 220px;
            --header-height: 64px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
            --max-width: 1200px;
        }

        /* ===== 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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            display: flex;
            min-height: 100vh;
            flex-direction: column;
        }

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

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

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

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

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 600;
            color: var(--secondary);
        }

        h1 {
            font-size: 2.5rem;
            letter-spacing: -0.02em;
        }

        h2 {
            font-size: 2rem;
            letter-spacing: -0.01em;
        }

        h3 {
            font-size: 1.375rem;
        }

        h4 {
            font-size: 1.125rem;
        }

        p {
            margin-bottom: 1rem;
            color: var(--text-light);
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Layout: Sidebar + Main ===== */
        .layout-wrapper {
            display: flex;
            min-height: 100vh;
        }

        /* ===== Sidebar ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            padding: 0;
        }

        .sidebar-brand {
            padding: 24px 20px 20px;
            border-bottom: 1px solid var(--border-light);
        }

        .sidebar-brand .logo {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--secondary);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .sidebar-brand .logo i {
            color: var(--primary);
            font-size: 1.4rem;
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
            overflow-y: auto;
        }

        .sidebar-nav .nav-link {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-light);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition);
        }

        .sidebar-nav .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 1.1rem;
            flex-shrink: 0;
        }

        .sidebar-nav .nav-link:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }

        .sidebar-nav .nav-link.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }

        .sidebar-nav .nav-link.active:hover {
            background: var(--primary-dark);
            color: #fff;
        }

        .sidebar-footer {
            padding: 16px 20px 20px;
            border-top: 1px solid var(--border-light);
            font-size: 0.8rem;
            color: var(--text-lighter);
            text-align: center;
        }

        /* ===== Main Content ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: var(--bg);
            border-bottom: 1px solid var(--border);
            z-index: 999;
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            box-shadow: var(--shadow-sm);
        }

        .mobile-header .logo {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--secondary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .mobile-header .logo i {
            color: var(--primary);
        }

        .mobile-menu-toggle {
            display: flex;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }

        .mobile-menu-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: all var(--transition);
        }

        .mobile-menu-toggle:hover {
            background: var(--bg-alt);
        }

        /* Mobile overlay */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 998;
            backdrop-filter: blur(4px);
        }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            padding: 80px 0 64px;
            background: linear-gradient(135deg, var(--secondary) 0%, #1e3a5f 50%, var(--primary-dark) 100%);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }

        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }

        .page-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 20% 80%, rgba(37, 99, 235, 0.3) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 20%, rgba(245, 158, 11, 0.15) 0%, transparent 50%);
            pointer-events: none;
        }

        .page-banner .container {
            position: relative;
            z-index: 2;
        }

        .page-banner .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            color: #fff;
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 20px;
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .page-banner .banner-badge i {
            color: var(--accent);
        }

        .page-banner h1 {
            color: #fff;
            font-size: 2.75rem;
            font-weight: 700;
            margin-bottom: 16px;
            max-width: 720px;
        }

        .page-banner p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.1rem;
            max-width: 600px;
            margin-bottom: 0;
        }

        .page-banner .banner-stats {
            display: flex;
            gap: 40px;
            margin-top: 32px;
        }

        .page-banner .banner-stats .stat-item {
            color: #fff;
        }

        .page-banner .banner-stats .stat-number {
            font-size: 1.75rem;
            font-weight: 700;
            color: #fff;
        }

        .page-banner .banner-stats .stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 2px;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 16px 0;
            font-size: 0.9rem;
            color: var(--text-lighter);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-light);
        }

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

        .breadcrumb .sep {
            color: var(--text-lighter);
            font-size: 0.7rem;
        }

        .breadcrumb .current {
            color: var(--text);
            font-weight: 500;
        }

        /* ===== Section ===== */
        .section {
            padding: 72px 0;
        }

        .section-alt {
            background: var(--bg-alt);
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header h2 {
            margin-bottom: 12px;
        }

        .section-header p {
            max-width: 600px;
            margin: 0 auto;
            font-size: 1.05rem;
        }

        .section-header .section-tag {
            display: inline-block;
            background: var(--primary-bg);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        /* ===== Guide Steps ===== */
        .guide-steps {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            counter-reset: step;
        }

        .guide-step {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 36px 28px 32px;
            border: 1px solid var(--border);
            transition: all var(--transition);
            position: relative;
        }

        .guide-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }

        .guide-step .step-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-bg);
            line-height: 1;
            margin-bottom: 12px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .guide-step h3 {
            margin-bottom: 10px;
            font-size: 1.2rem;
        }

        .guide-step p {
            font-size: 0.95rem;
            margin-bottom: 0;
        }

        .guide-step .step-icon {
            width: 48px;
            height: 48px;
            background: var(--primary-bg);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.3rem;
            margin-bottom: 16px;
        }

        /* ===== Product Cards ===== */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .product-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }

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

        .product-card .card-img {
            height: 220px;
            background: var(--bg-alt);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            position: relative;
        }

        .product-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .product-card:hover .card-img img {
            transform: scale(1.05);
        }

        .product-card .card-img .card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--primary);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 50px;
        }

        .product-card .card-img .card-tag.hot {
            background: #ef4444;
        }

        .product-card .card-img .card-tag.best {
            background: var(--accent-dark);
        }

        .product-card .card-body {
            padding: 22px 24px 24px;
        }

        .product-card .card-body h3 {
            font-size: 1.1rem;
            margin-bottom: 8px;
        }

        .product-card .card-body .specs {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 14px;
        }

        .product-card .card-body .specs .spec {
            background: var(--bg-alt);
            padding: 2px 10px;
            border-radius: 4px;
            font-size: 0.8rem;
            color: var(--text-light);
        }

        .product-card .card-body .price {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 14px;
        }

        .product-card .card-body .price .original {
            font-size: 0.85rem;
            color: var(--text-lighter);
            text-decoration: line-through;
            font-weight: 400;
            margin-left: 8px;
        }

        .product-card .card-body .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 20px;
            border: 1px solid var(--primary);
            color: var(--primary);
            border-radius: 50px;
            font-weight: 500;
            font-size: 0.9rem;
            transition: all var(--transition);
        }

        .product-card .card-body .btn-outline:hover {
            background: var(--primary);
            color: #fff;
        }

        /* ===== Tips List ===== */
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .tip-item {
            display: flex;
            gap: 18px;
            background: var(--bg-card);
            padding: 24px 28px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }

        .tip-item:hover {
            box-shadow: var(--shadow);
            border-color: var(--primary-light);
        }

        .tip-item .tip-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            background: var(--primary-bg);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1.2rem;
        }

        .tip-item .tip-content h4 {
            font-size: 1.05rem;
            margin-bottom: 4px;
        }

        .tip-item .tip-content p {
            font-size: 0.92rem;
            margin-bottom: 0;
        }

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

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

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

        .faq-question {
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text);
            gap: 16px;
            user-select: none;
            transition: background var(--transition);
        }

        .faq-question:hover {
            background: var(--bg-alt);
        }

        .faq-question i {
            color: var(--primary);
            transition: transform var(--transition);
            flex-shrink: 0;
            font-size: 0.9rem;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        .faq-answer p {
            font-size: 0.95rem;
            margin-bottom: 0;
            color: var(--text-light);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--secondary) 0%, var(--primary-dark) 100%);
            padding: 72px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-section h2 {
            color: #fff;
            font-size: 2.2rem;
            margin-bottom: 16px;
        }

        .cta-section p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.1rem;
            max-width: 560px;
            margin: 0 auto 32px;
        }

        .cta-section .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: var(--accent);
            color: var(--secondary);
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.05rem;
            transition: all var(--transition);
            box-shadow: 0 4px 20px rgba(245, 158, 11, 0.35);
        }

        .cta-section .btn-cta:hover {
            background: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(245, 158, 11, 0.45);
            color: var(--secondary);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--secondary);
            color: rgba(255, 255, 255, 0.8);
            padding: 56px 0 0;
            margin-top: auto;
        }

        .footer .container {
            padding: 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-brand .logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }

        .footer-brand .logo i {
            color: var(--primary-light);
        }

        .footer-brand p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.92rem;
            margin-bottom: 0;
            line-height: 1.7;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-col ul li {
            margin-bottom: 10px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
        }

        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            transition: color var(--transition);
        }

        .footer-col ul li a:hover {
            color: var(--primary-light);
        }

        .footer-bottom {
            text-align: center;
            padding: 20px 0;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 2px 12px rgba(37, 99, 235, 0.2);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(37, 99, 235, 0.3);
            color: #fff;
        }

        .btn-outline {
            border: 1px solid var(--border);
            color: var(--text);
            background: transparent;
        }

        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-bg);
        }

        .btn-sm {
            padding: 6px 16px;
            font-size: 0.85rem;
        }

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

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

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

        @media (max-width: 768px) {
            :root {
                --sidebar-width: 0px;
            }

            .sidebar {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: var(--shadow-lg);
            }

            .sidebar.open {
                transform: translateX(0);
            }

            .sidebar-overlay.active {
                display: block;
            }

            .mobile-header {
                display: flex;
            }

            .main-content {
                margin-left: 0;
                padding-top: var(--header-height);
            }

            .page-banner {
                padding: 48px 0 40px;
                min-height: 240px;
            }

            .page-banner h1 {
                font-size: 1.75rem;
            }

            .page-banner p {
                font-size: 0.95rem;
            }

            .page-banner .banner-stats {
                gap: 24px;
                flex-wrap: wrap;
            }

            .page-banner .banner-stats .stat-number {
                font-size: 1.3rem;
            }

            .section {
                padding: 48px 0;
            }

            .section-header {
                margin-bottom: 32px;
            }

            .section-header h2 {
                font-size: 1.5rem;
            }

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

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

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

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .footer {
                padding: 40px 0 0;
            }

            .cta-section h2 {
                font-size: 1.5rem;
            }

            .cta-section .btn-cta {
                padding: 12px 28px;
                font-size: 0.95rem;
            }

            .breadcrumb {
                font-size: 0.8rem;
                padding: 12px 0;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .page-banner h1 {
                font-size: 1.4rem;
            }

            .page-banner .banner-stats {
                gap: 16px;
                flex-direction: column;
            }

            .guide-step {
                padding: 24px 20px;
            }

            .product-card .card-body {
                padding: 16px 18px 20px;
            }

            .tip-item {
                flex-direction: column;
                padding: 18px 20px;
            }

            .faq-question {
                padding: 16px 18px;
                font-size: 0.95rem;
            }

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

            .faq-item.active .faq-answer {
                padding: 0 18px 16px;
            }

            .footer-grid {
                gap: 20px;
            }
        }

        /* ===== Scrollbar ===== */
        .sidebar-nav::-webkit-scrollbar {
            width: 4px;
        }

        .sidebar-nav::-webkit-scrollbar-track {
            background: transparent;
        }

        .sidebar-nav::-webkit-scrollbar-thumb {
            background: var(--border);
            border-radius: 4px;
        }

        /* ===== Focus ===== */
        a:focus-visible,
        button:focus-visible,
        .nav-link:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-light: #3b82f6;
            --primary-dark: #1e40af;
            --primary-bg: #eff6ff;
            --secondary: #0f172a;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #1e293b;
            --text-light: #64748b;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --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 10px 30px rgba(0,0,0,0.1);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --nav-width: 240px;
            --header-height: 0px;
            --max-width: 1200px;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            display: flex;
            min-height: 100vh;
            flex-direction: column;
        }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--secondary); font-weight: 700; }
        h1 { font-size: 2.25rem; letter-spacing: -0.02em; }
        h2 { font-size: 1.75rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.35rem; }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1rem; }
        .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

        /* ===== Layout: Sidebar Nav + Main ===== */
        .app-wrapper {
            display: flex;
            min-height: 100vh;
        }

        /* ===== Sidebar Navigation ===== */
        .sidebar {
            width: var(--nav-width);
            background: var(--bg);
            border-right: 1px solid var(--border);
            padding: 28px 0 32px;
            position: fixed;
            top: 0;
            left: 0;
            height: 100vh;
            overflow-y: auto;
            z-index: 100;
            display: flex;
            flex-direction: column;
            transition: transform var(--transition);
        }
        .sidebar-brand {
            padding: 0 20px 24px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 16px;
        }
        .sidebar-brand .logo {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--secondary);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.01em;
        }
        .sidebar-brand .logo i { color: var(--primary); font-size: 1.3rem; }
        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 4px;
            padding: 0 12px;
            flex: 1;
        }
        .sidebar-nav .nav-link {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            color: var(--text-light);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition);
        }
        .sidebar-nav .nav-link i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .sidebar-nav .nav-link:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }
        .sidebar-nav .nav-link:hover i { color: var(--primary); }
        .sidebar-nav .nav-link.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 2px 8px rgba(26,86,219,0.25);
        }
        .sidebar-nav .nav-link.active i { color: #fff; }
        .sidebar-nav .nav-divider {
            height: 1px;
            background: var(--border);
            margin: 12px 14px;
        }
        .sidebar-footer {
            padding: 16px 20px 0;
            border-top: 1px solid var(--border);
            margin-top: auto;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* ===== Main Content Area ===== */
        .main-area {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            background: var(--bg-alt);
        }

        /* ===== Article Banner ===== */
        .article-banner {
            background: linear-gradient(135deg, var(--secondary) 0%, #1e293b 100%);
            padding: 48px 0 40px;
            position: relative;
            overflow: hidden;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.12;
            pointer-events: none;
        }
        .article-banner .container {
            position: relative;
            z-index: 1;
        }
        .article-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.6);
            margin-bottom: 16px;
        }
        .article-banner .breadcrumb a {
            color: rgba(255,255,255,0.7);
        }
        .article-banner .breadcrumb a:hover { color: #fff; }
        .article-banner .breadcrumb i { font-size: 0.75rem; }
        .article-banner h1 {
            color: #fff;
            font-size: 2rem;
            max-width: 800px;
            margin-bottom: 12px;
        }
        .article-banner .meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            color: rgba(255,255,255,0.65);
            font-size: 0.9rem;
        }
        .article-banner .meta i { margin-right: 6px; }
        .article-banner .meta .badge {
            display: inline-block;
            background: rgba(255,255,255,0.15);
            padding: 2px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            color: #fff;
        }

        /* ===== Article Content ===== */
        .article-content-wrap {
            padding: 40px 0 60px;
            flex: 1;
        }
        .article-content-wrap .container {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-body {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 40px 44px;
            box-shadow: var(--shadow);
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body .content p {
            margin-bottom: 1.25rem;
        }
        .article-body .content img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            box-shadow: var(--shadow-md);
        }
        .article-body .content h2, 
        .article-body .content h3 {
            margin-top: 32px;
            margin-bottom: 12px;
        }
        .article-body .content ul, 
        .article-body .content ol {
            margin-bottom: 1.25rem;
            padding-left: 24px;
        }
        .article-body .content li {
            margin-bottom: 6px;
            list-style: disc;
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            padding: 12px 20px;
            margin: 20px 0;
            background: var(--primary-bg);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
        }
        .article-body .content a { text-decoration: underline; }
        .article-not-found {
            text-align: center;
            padding: 60px 20px;
        }
        .article-not-found i {
            font-size: 3rem;
            color: var(--text-muted);
            margin-bottom: 16px;
        }
        .article-not-found h2 { font-size: 1.5rem; margin-bottom: 12px; }
        .article-not-found p { color: var(--text-light); margin-bottom: 24px; }
        .article-not-found .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        /* ===== Sidebar (Article) ===== */
        .article-sidebar > div {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 24px 28px;
            box-shadow: var(--shadow);
            margin-bottom: 24px;
        }
        .article-sidebar h4 {
            font-size: 1rem;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--secondary);
        }
        .article-sidebar h4 i { color: var(--primary); }
        .article-sidebar .related-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .article-sidebar .related-list li:last-child { border-bottom: none; }
        .article-sidebar .related-list a {
            color: var(--text);
            font-size: 0.95rem;
            display: flex;
            gap: 10px;
            align-items: flex-start;
        }
        .article-sidebar .related-list a:hover { color: var(--primary); }
        .article-sidebar .related-list .thumb {
            width: 60px;
            height: 60px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg-alt);
        }
        .article-sidebar .related-list .info { flex: 1; }
        .article-sidebar .related-list .info .title { font-weight: 600; font-size: 0.9rem; display: block; margin-bottom: 4px; }
        .article-sidebar .related-list .info .date { font-size: 0.8rem; color: var(--text-muted); }
        .article-sidebar .cat-list li {
            padding: 8px 0;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .article-sidebar .cat-list li:last-child { border-bottom: none; }
        .article-sidebar .cat-list a { color: var(--text); font-size: 0.95rem; }
        .article-sidebar .cat-list a:hover { color: var(--primary); }
        .article-sidebar .cat-list .count {
            background: var(--bg-alt);
            padding: 0 10px;
            border-radius: 20px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .article-sidebar .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-sidebar .tag-cloud .tag {
            display: inline-block;
            padding: 4px 14px;
            background: var(--bg-alt);
            border-radius: 20px;
            font-size: 0.85rem;
            color: var(--text-light);
            transition: all var(--transition);
        }
        .article-sidebar .tag-cloud .tag:hover {
            background: var(--primary);
            color: #fff;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 2px 8px rgba(26,86,219,0.2);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: 0 4px 16px rgba(26,86,219,0.3);
            transform: translateY(-1px);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-sm { padding: 6px 16px; font-size: 0.85rem; }
        .btn-lg { padding: 14px 32px; font-size: 1.05rem; }

        /* ===== Footer ===== */
        .footer {
            background: var(--secondary);
            color: rgba(255,255,255,0.7);
            padding: 48px 0 32px;
            margin-top: auto;
        }
        .footer .container { max-width: var(--max-width); }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 36px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo {
            font-size: 1.2rem;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
        }
        .footer-brand .logo i { color: var(--accent); }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.55); max-width: 320px; }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 10px;
            font-size: 0.9rem;
        }
        .footer-col ul li a {
            color: rgba(255,255,255,0.55);
            transition: color var(--transition);
        }
        .footer-col ul li a:hover { color: var(--accent); }
        .footer-bottom {
            text-align: center;
            padding-top: 24px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.35);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-content-wrap .container {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .article-sidebar > div { margin-bottom: 0; }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
                width: 260px;
                box-shadow: var(--shadow-lg);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .main-area {
                margin-left: 0;
            }
            .mobile-toggle {
                display: flex !important;
                position: fixed;
                top: 16px;
                left: 16px;
                z-index: 200;
                background: var(--bg);
                border: 1px solid var(--border);
                border-radius: var(--radius-sm);
                width: 40px;
                height: 40px;
                align-items: center;
                justify-content: center;
                cursor: pointer;
                box-shadow: var(--shadow);
                color: var(--text);
                font-size: 1.2rem;
            }
            .mobile-toggle:hover { background: var(--bg-alt); }
            .overlay {
                display: none;
                position: fixed;
                inset: 0;
                background: rgba(0,0,0,0.4);
                z-index: 99;
            }
            .overlay.show { display: block; }
            .article-banner { padding: 32px 0 28px; }
            .article-banner h1 { font-size: 1.5rem; }
            .article-body { padding: 24px 20px; }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 520px) {
            .article-banner h1 { font-size: 1.25rem; }
            .article-banner .meta { flex-direction: column; gap: 8px; }
            .article-body { padding: 16px; }
            .article-body .content { font-size: 1rem; }
            .footer-grid { grid-template-columns: 1fr; }
            .sidebar { width: 100%; max-width: 300px; }
        }

        /* ===== Mobile Toggle ===== */
        .mobile-toggle { display: none; }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-8 { margin-top: 32px; }
        .mb-8 { margin-bottom: 32px; }
        .gap-4 { gap: 16px; }
        .flex { display: flex; }
        .flex-wrap { flex-wrap: wrap; }
        .items-center { align-items: center; }

        /* ===== Print ===== */
        @media print {
            .sidebar, .mobile-toggle, .overlay, .footer, .article-sidebar { display: none; }
            .main-area { margin-left: 0; }
            .article-body { box-shadow: none; padding: 0; }
            .article-banner { background: #fff !important; padding: 20px 0; }
            .article-banner h1 { color: #000; }
            .article-banner .meta { color: #666; }
        }