/* roulang page: index */
/* ===== 设计变量 ===== */
  :root {
    --primary: #2563EB;
    --primary-light: #EFF6FF;
    --primary-hover: #1D4ED8;
    --primary-border: #BFDBFE;
    --accent: #F97316;
    --accent-light: #FFF7ED;
    --bg: #F8FAFC;
    --card-bg: #FFFFFF;
    --footer-bg: #0F172A;
    --text-heading: #0F172A;
    --text-body: #334155;
    --text-muted: #64748B;
    --text-disabled: #94A3B8;
    --border: #E2E8F0;
    --radius-card: 14px;
    --radius-btn: 10px;
    --radius-pill: 999px;
    --shadow-card: 0 1px 3px rgba(15,23,42,0.06), 0 4px 12px rgba(15,23,42,0.05);
    --shadow-hover: 0 8px 24px rgba(37,99,235,0.12);
    --container-max: 1200px;
    --header-h: 70px;
    --space-section: 88px;
    --space-mobile: 56px;
  }

  /* ===== Reset / Base ===== */
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    background-color: var(--bg);
    color: var(--text-body);
    line-height: 1.7;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
  }
  a { text-decoration: none; color: inherit; transition: color .2s ease; }
  img { max-width: 100%; display: block; }
  button, input, select, textarea { font-family: inherit; font-size: inherit; line-height: inherit; border: none; outline: none; }
  h1, h2, h3, h4, h5 { color: var(--text-heading); font-weight: 700; line-height: 1.25; }

  /* ===== 通用容器 ===== */
  .container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }
  .section-pad { padding: var(--space-section) 0; }
  @media (max-width: 768px) {
    .section-pad { padding: var(--space-mobile) 0; }
  }

  /* ===== 导航 ===== */
  .site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    height: var(--header-h);
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(226,232,240,.72);
    transition: box-shadow .25s ease;
  }
  .site-header.scrolled { box-shadow: 0 4px 20px rgba(15,23,42,.06); }
  .nav-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
  .brand { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; color: var(--text-heading); }
  .brand-icon { background: linear-gradient(135deg,#2563EB,#1D4ED8); color: #fff; width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 18px; box-shadow: 0 4px 12px rgba(37,99,235,.3); }
  .brand-text { letter-spacing: .5px; }
  .nav-links { display: flex; align-items: center; gap: 4px; }
  .nav-links a {
    display: inline-flex; align-items: center; padding: 8px 16px;
    border-radius: var(--radius-pill); font-size: 14px; font-weight: 500;
    color: var(--text-body); transition: all .2s ease;
  }
  .nav-links a:hover { background: var(--primary-light); color: var(--primary); }
  .nav-links a.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
  .nav-cta { display: flex; align-items: center; gap: 12px; }
  .badge-online { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 500; color: #059669; background: #ECFDF5; padding: 4px 12px; border-radius: var(--radius-pill); border: 1px solid #A7F3D0; }
  .badge-online .dot { width: 7px; height: 7px; background: #10B981; border-radius: 50%; display: inline-block; position: relative; }
  .badge-online .dot::after { content: ''; position: absolute; inset: -4px; background: rgba(16,185,129,.25); border-radius: 50%; animation: pulse-dot 2s infinite; }
  @keyframes pulse-dot { 0%,100% { transform: scale(.7); opacity: 1; } 50% { transform: scale(1.3); opacity: .4; } }

  .btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 24px; border-radius: var(--radius-btn); font-size: 14px; font-weight: 600; cursor: pointer; transition: all .2s ease; border: 1px solid transparent; }
  .btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,.25); }
  .btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(37,99,235,.3); }
  .btn-accent { background: var(--accent); color: #fff; box-shadow: 0 4px 14px rgba(249,115,22,.25); }
  .btn-accent:hover { background: #EA580C; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(249,115,22,.3); }
  .btn-outline { background: #fff; border: 1px solid var(--border); color: var(--text-body); }
  .btn-outline:hover { border-color: var(--primary); color: var(--primary); }
  .btn-lg { padding: 14px 36px; font-size: 16px; border-radius: 12px; }
  .btn:focus-visible { outline: 2px solid #93C5FD; outline-offset: 2px; }
  .btn:disabled { background: #E2E8F0; color: #94A3B8; cursor: not-allowed; box-shadow: none; }

  /* 汉堡 */
  .hamburger { display: none; flex-direction: column; gap: 5px; background: none; cursor: pointer; padding: 8px; border-radius: 8px; }
  .hamburger span { width: 22px; height: 2px; background: var(--text-heading); border-radius: 2px; transition: all .3s ease; }
  .mobile-menu { display: none; position: fixed; top: var(--header-h); left: 0; right: 0; background: #fff; padding: 16px 24px 24px; box-shadow: 0 12px 32px rgba(15,23,42,.1); z-index: 999; border-bottom: 1px solid var(--border); }
  .mobile-menu.open { display: block; }
  .mobile-menu a { display: block; padding: 12px 16px; border-radius: 10px; font-size: 15px; font-weight: 500; color: var(--text-body); margin-bottom: 4px; }
  .mobile-menu a:hover { background: var(--primary-light); color: var(--primary); }

  /* ===== Hero ===== */
  .hero {
    position: relative; padding: calc(var(--header-h) + 72px) 0 88px;
    background: linear-gradient(135deg, #EEF2FF 0%, #EFF6FF 50%, #F0F9FF 100%);
    overflow: hidden;
  }
  .hero-bg { position: absolute; inset: 0; background-image: url('/assets/images/backpic/back-1.jpg'); background-size: cover; background-position: center; opacity: .18; }
  /* 可替换为 /assets/images/backpic */
  .hero-bg::after { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(255,255,255,.92) 0%, rgba(255,255,255,.75) 60%, rgba(239,246,255,.8) 100%); }
  .hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1.1fr .9fr; gap: 60px; align-items: center; }
  .hero-badge { display: inline-flex; align-items: center; gap: 8px; background: var(--primary-light); border: 1px solid var(--primary-border); color: var(--primary); font-size: 13px; font-weight: 600; padding: 6px 16px; border-radius: var(--radius-pill); margin-bottom: 20px; }
  .hero-badge::before { content: '●'; font-size: 8px; color: var(--accent); }
  .hero h1 { font-size: clamp(30px, 4.2vw, 44px); font-weight: 800; line-height: 1.2; margin-bottom: 18px; color: var(--text-heading); letter-spacing: -0.5px; }
  .hero h1 .highlight { color: var(--primary); position: relative; }
  .hero-desc { font-size: 16px; line-height: 1.8; color: var(--text-body); margin-bottom: 28px; max-width: 540px; }
  .hero-btns { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 40px; }
  .hero-stats { display: flex; gap: 40px; padding-top: 28px; border-top: 1px solid rgba(226,232,240,.8); }
  .hero-stat-item { text-align: left; }
  .hero-stat-item .num { display: block; font-size: 28px; font-weight: 800; color: var(--text-heading); line-height: 1.2; }
  .hero-stat-item .num span { color: var(--accent); }
  .hero-stat-item .label { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

  .hero-visual { position: relative; }
  .hero-visual-card { background: #fff; border-radius: var(--radius-card); box-shadow: var(--shadow-hover); padding: 24px; position: relative; overflow: hidden; border: 1px solid var(--primary-border); }
  .hero-visual-card .cover-img { border-radius: 10px; height: 240px; object-fit: cover; width: 100%; margin-bottom: 16px; }
  .hero-visual-tag { position: absolute; top: 16px; left: 16px; background: var(--accent); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: var(--radius-pill); box-shadow: 0 4px 12px rgba(249,115,22,.3); }
  .hero-visual-list { display: flex; flex-direction: column; gap: 10px; }
  .hero-visual-item { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--text-body); }
  .hero-visual-item i { color: var(--primary); font-size: 14px; }
  .hero-visual-footer { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--text-muted); }

  /* ===== 指标看板 ===== */
  .metrics { padding: 60px 0; background: #fff; border-bottom: 1px solid var(--border); }
  .metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
  .metric-card { text-align: center; background: #F8FAFC; border: 1px solid #EEF2F7; border-radius: var(--radius-card); padding: 30px 20px; transition: all .25s ease; }
  .metric-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--primary-border); background: #fff; }
  .metric-card .number { font-size: 40px; font-weight: 800; color: var(--primary); line-height: 1.1; }
  .metric-card .number span { font-size: 18px; font-weight: 600; color: var(--text-muted); }
  .metric-card .title { font-size: 15px; font-weight: 600; color: var(--text-heading); margin-top: 6px; }
  .metric-card .desc { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

  /* ===== 服务矩阵 ===== */
  .services { padding: var(--space-section) 0; }
  .section-head { text-align: center; max-width: 640px; margin: 0 auto 52px; }
  .section-tag { display: inline-block; font-size: 13px; font-weight: 600; color: var(--primary); background: var(--primary-light); border: 1px solid var(--primary-border); padding: 4px 14px; border-radius: var(--radius-pill); margin-bottom: 12px; }
  .section-head h2 { font-size: clamp(26px, 3vw, 32px); font-weight: 800; margin-bottom: 12px; }
  .section-head p { font-size: 15px; color: var(--text-muted); line-height: 1.7; }
  .services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
  .service-card {
    background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-card);
    padding: 28px; box-shadow: var(--shadow-card); transition: all .25s ease; position: relative;
  }
  .service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); border-color: var(--primary-border); }
  .service-icon { width: 46px; height: 46px; background: var(--primary-light); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 20px; color: var(--primary); margin-bottom: 18px; transition: all .25s ease; }
  .service-card:hover .service-icon { background: var(--primary); color: #fff; }
  .service-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
  .service-card p { font-size: 14px; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; }
  .service-tags { display: flex; flex-wrap: wrap; gap: 8px; }
  .service-tags span { font-size: 12px; background: #F8FAFC; border: 1px solid var(--border); color: var(--text-muted); padding: 3px 10px; border-radius: var(--radius-pill); }

  /* ===== 结果对比 ===== */
  .comparison { padding: var(--space-section) 0; background: #fff; }
  .comparison-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
  .comparison-col { background: #fff; border-radius: var(--radius-card); padding: 32px; border: 1px solid var(--border); box-shadow: var(--shadow-card); }
  .comparison-col h3 { font-size: 18px; font-weight: 700; margin-bottom: 20px; display: flex; align-items: center; gap: 8px; }
  .comparison-col.left { border-left: 4px solid #94A3B8; }
  .comparison-col.right { border-left: 4px solid var(--primary); }
  .comparison-col h3 .icon { font-size: 20px; }
  .comparison-list { list-style: none; display: flex; flex-direction: column; gap: 14px; }
  .comparison-list li { display: flex; gap: 10px; font-size: 14px; line-height: 1.6; color: var(--text-body); }
  .comparison-list .mark { flex-shrink: 0; width: 20px; height: 20px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 11px; margin-top: 2px; }
  .comparison-list .mark.err { background: #FEF2F2; color: #EF4444; }
  .comparison-list .mark.ok { background: #ECFDF5; color: #10B981; }
  .comparison-banner { margin-top: 36px; background: linear-gradient(135deg, #EFF6FF, #F0F9FF); border: 1px solid var(--primary-border); border-radius: var(--radius-card); padding: 24px 32px; text-align: center; font-size: 16px; font-weight: 600; color: var(--text-heading); }

  /* ===== 套餐对比 ===== */
  .pricing { padding: var(--space-section) 0; }
  .pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
  .price-card { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 32px 28px; position: relative; box-shadow: var(--shadow-card); transition: all .25s ease; display: flex; flex-direction: column; }
  .price-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
  .price-card.recommended { border: 2px solid var(--primary); box-shadow: 0 12px 32px rgba(37,99,235,.15); }
  .price-card .rec-badge { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--primary); color: #fff; font-size: 13px; font-weight: 700; padding: 4px 20px; border-radius: var(--radius-pill); box-shadow: 0 4px 12px rgba(37,99,235,.35); }
  .price-name { font-size: 18px; font-weight: 700; color: var(--text-heading); }
  .price-amount { font-size: 36px; font-weight: 800; color: var(--text-heading); margin: 16px 0 4px; }
  .price-amount small { font-size: 14px; font-weight: 500; color: var(--text-muted); }
  .price-desc { font-size: 13px; color: var(--text-muted); margin-bottom: 20px; }
  .price-list { list-style: none; display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; flex-grow: 1; }
  .price-list li { display: flex; gap: 8px; font-size: 14px; color: var(--text-body); align-items: flex-start; }
  .price-list i { color: var(--primary); font-size: 14px; margin-top: 3px; flex-shrink: 0; }
  .price-list li.not { color: var(--text-disabled); }
  .price-list li.not i { color: var(--text-disabled); }

  /* ===== 资讯区 ===== */
  .news { padding: var(--space-section) 0; background: #fff; }
  .news-layout { display: grid; grid-template-columns: 2fr 1fr; gap: 48px; }
  .news-list { display: flex; flex-direction: column; gap: 10px; }
  .news-item { display: flex; gap: 20px; padding: 20px 0; border-bottom: 1px solid #F1F5F9; transition: background .2s ease; }
  .news-item:hover { background: #F8FAFC; border-radius: 10px; padding-left: 12px; padding-right: 12px; }
  .news-thumb { width: 180px; height: 110px; border-radius: 10px; object-fit: cover; flex-shrink: 0; overflow: hidden; }
  .news-item .cover { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
  .news-item:hover .cover { transform: scale(1.05); }
  .news-content { flex: 1; }
  .news-meta { display: flex; align-items: center; gap: 12px; font-size: 12px; color: var(--text-muted); margin-bottom: 4px; }
  .news-meta .tag { background: var(--primary-light); color: var(--primary); padding: 2px 8px; border-radius: 4px; font-weight: 500; }
  .news-item h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; line-height: 1.5; }
  .news-item h3 a { color: var(--text-heading); }
  .news-item h3 a:hover { color: var(--primary); }
  .news-item p { font-size: 13px; color: var(--text-muted); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
  .news-side { display: flex; flex-direction: column; gap: 20px; }
  .side-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-card); padding: 24px; }
  .side-card h4 { font-size: 15px; font-weight: 700; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
  .side-card h4 i { color: var(--accent); }
  .side-list { list-style: none; display: flex; flex-direction: column; gap: 10px; }
  .side-list li { font-size: 14px; line-height: 1.5; padding-left: 16px; position: relative; color: var(--text-body); }
  .side-list li::before { content: '›'; position: absolute; left: 0; color: var(--primary); font-weight: 700; }
  .side-list li a:hover { color: var(--primary); }

  /* ===== FAQ ===== */
  .faq { padding: var(--space-section) 0; }
  .faq-wrap { max-width: 820px; margin: 0 auto; background: #F8FAFC; border-radius: 20px; padding: 40px 40px; border: 1px solid var(--border); }
  .faq-item { background: #fff; border: 1px solid var(--border); border-radius: 12px; margin-bottom: 12px; overflow: hidden; transition: box-shadow .2s ease; }
  .faq-item.active { box-shadow: var(--shadow-card); border-color: var(--primary-border); }
  .faq-question { display: flex; align-items: center; justify-content: space-between; padding: 18px 22px; cursor: pointer; font-size: 15px; font-weight: 600; color: var(--text-heading); background: #fff; transition: background .2s; }
  .faq-question:hover { background: var(--primary-light); }
  .faq-item.active .faq-question { background: var(--primary-light); color: var(--primary); }
  .faq-arrow { font-size: 16px; color: var(--text-muted); transition: transform .2s ease; flex-shrink: 0; }
  .faq-item.active .faq-arrow { transform: rotate(180deg); color: var(--primary); }
  .faq-answer { max-height: 0; overflow: hidden; transition: max-height .2s ease; padding: 0 22px; }
  .faq-item.active .faq-answer { max-height: 300px; padding: 0 22px 18px; }
  .faq-answer p { font-size: 14px; color: var(--text-body); line-height: 1.7; }

  /* ===== 转化表单 ===== */
  .cta-section { padding: var(--space-section) 0; position: relative; }
  .cta-section::before { content: ''; position: absolute; inset: 0; background-image: url('/assets/images/backpic/back-2.jpg'); background-size: cover; background-position: center; opacity: .08; }
  /* 可替换为 /assets/images/backpic */
  .cta-inner { position: relative; z-index: 2; max-width: 720px; margin: 0 auto; background: #fff; border-radius: 20px; box-shadow: var(--shadow-hover); padding: 48px; border: 1px solid var(--border); }
  .cta-inner h2 { font-size: 28px; font-weight: 800; text-align: center; margin-bottom: 8px; }
  .cta-inner .sub { text-align: center; color: var(--text-muted); font-size: 14px; margin-bottom: 32px; }
  .form-group { margin-bottom: 20px; }
  .form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--text-heading); margin-bottom: 6px; }
  .form-group input, .form-group select, .form-group textarea {
    width: 100%; border: 1px solid var(--border); border-radius: 10px;
    padding: 11px 14px; font-size: 14px; background: #fff; color: var(--text-body);
    transition: border-color .2s, box-shadow .2s;
  }
  .form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1); outline: none;
  }
  .form-group textarea { min-height: 100px; resize: vertical; }
  .form-trust { display: flex; align-items: center; justify-content: center; gap: 8px; font-size: 13px; color: var(--text-muted); margin-top: 16px; }
  .form-trust i { color: var(--primary); }

  /* ===== 页脚 ===== */
  .site-footer { background: var(--footer-bg); color: #94A3B8; padding: 60px 0 24px; }
  .footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
  .footer-brand .brand { color: #fff; margin-bottom: 14px; }
  .footer-brand .brand-text { color: #fff; }
  .footer-brand .brand-icon { background: linear-gradient(135deg,#2563EB,#3B82F6); }
  .footer-brand p { font-size: 14px; line-height: 1.7; max-width: 320px; }
  .footer-col h5 { color: #fff; font-size: 15px; font-weight: 600; margin-bottom: 16px; }
  .footer-col a { display: block; padding: 4px 0; font-size: 14px; color: #94A3B8; transition: color .2s; }
  .footer-col a:hover { color: #fff; }
  .footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: #64748B; flex-wrap: wrap; gap: 12px; }

  /* ===== 浮动按钮 ===== */
  .float-bar { position: fixed; bottom: 24px; right: 24px; z-index: 900; display: flex; flex-direction: column; gap: 10px; }
  .float-btn { width: 48px; height: 48px; background: var(--primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 20px; box-shadow: 0 8px 24px rgba(37,99,235,.35); transition: all .2s; }
  .float-btn:hover { transform: scale(1.1); background: var(--primary-hover); }

  /* ===== 响应式 ===== */
  @media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero-visual { max-width: 600px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .comparison-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    .news-layout { grid-template-columns: 1fr; }
    .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  }
  @media (max-width: 768px) {
    .nav-links, .nav-cta .btn, .badge-online { display: none; }
    .hamburger { display: flex; }
    .hero { padding: calc(var(--header-h) + 40px) 0 56px; }
    .hero-stats { gap: 20px; flex-wrap: wrap; }
    .hero-stat-item .num { font-size: 22px; }
    .services-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .cta-inner { padding: 28px 20px; }
    .faq-wrap { padding: 24px 16px; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .container { padding: 0 16px; }
    .hero-btns .btn { flex: 1; justify-content: center; }
  }
  @media (max-width: 520px) {
    .metrics-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .metric-card { padding: 20px 12px; }
    .metric-card .number { font-size: 30px; }
    .news-item { flex-direction: column; gap: 12px; }
    .news-thumb { width: 100%; height: 160px; }
    .hero-visual-card .cover-img { height: 180px; }
    .cta-inner h2 { font-size: 24px; }
  }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563EB;
            --primary-light: #EFF6FF;
            --primary-hover: #1D4ED8;
            --primary-border: #BFDBFE;
            --accent: #F97316;
            --accent-light: #FFF7ED;
            --bg: #F8FAFC;
            --card-bg: #FFFFFF;
            --footer-bg: #0F172A;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --text-disabled: #94A3B8;
            --border: #E2E8F0;
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-pill: 999px;
            --shadow-card: 0 1px 3px rgba(15,23,42,0.06), 0 4px 12px rgba(15,23,42,0.05);
            --shadow-hover: 0 8px 24px rgba(37,99,235,0.12);
            --container-max: 1200px;
            --header-h: 70px;
            --space-section: 88px;
            --space-mobile: 56px;
        }

        html {
            scroll-behavior: smooth;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background-color: var(--bg);
            color: var(--text-body);
            line-height: 1.7;
            font-size: 15px;
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color .2s ease;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
        }
        ul,
        ol {
            list-style: none;
        }

        /* ===== 通用容器 ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-pad {
            padding: var(--space-section) 0;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid rgba(226, 232, 240, .72);
            transition: box-shadow .25s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(15, 23, 42, .06);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--header-h);
        }
        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--text-heading);
        }
        .brand-icon {
            background: linear-gradient(135deg, #2563EB, #1D4ED8);
            color: #fff;
            width: 36px;
            height: 36px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            box-shadow: 0 4px 12px rgba(37, 99, 235, .3);
        }
        .brand-text {
            letter-spacing: .5px;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-links a {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: var(--radius-pill);
            font-size: 14px;
            font-weight: 500;
            color: var(--text-body);
            transition: all .2s ease;
        }
        .nav-links a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .nav-links a.active {
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }
        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .badge-online {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 500;
            color: #059669;
            background: #ECFDF5;
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            border: 1px solid #A7F3D0;
        }
        .badge-online .dot {
            width: 7px;
            height: 7px;
            background: #10B981;
            border-radius: 50%;
            display: inline-block;
            position: relative;
        }
        .badge-online .dot::after {
            content: '';
            position: absolute;
            inset: -4px;
            background: rgba(16, 185, 129, .25);
            border-radius: 50%;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                transform: scale(1);
                opacity: 1;
            }
            50% {
                transform: scale(1.6);
                opacity: .4;
            }
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: all .2s ease;
            border: 1px solid transparent;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(37, 99, 235, .25);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(37, 99, 235, .3);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(249, 115, 22, .25);
        }
        .btn-accent:hover {
            background: #EA580C;
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(249, 115, 22, .3);
        }
        .btn-outline {
            background: #fff;
            border: 1px solid var(--border);
            color: var(--text-body);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
        }
        .btn-lg {
            padding: 14px 36px;
            font-size: 16px;
            border-radius: 12px;
        }
        .btn:focus-visible {
            outline: 2px solid #93C5FD;
            outline-offset: 2px;
        }
        .btn:disabled {
            background: #E2E8F0;
            color: #94A3B8;
            cursor: not-allowed;
            box-shadow: none;
        }

        /* 汉堡 */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
        }
        .hamburger span {
            width: 22px;
            height: 2px;
            background: var(--text-heading);
            border-radius: 2px;
            transition: all .3s ease;
        }
        .hamburger.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--header-h);
            left: 0;
            right: 0;
            background: #fff;
            padding: 16px 24px 24px;
            box-shadow: 0 12px 32px rgba(15, 23, 42, .1);
            z-index: 999;
            border-bottom: 1px solid var(--border);
        }
        .mobile-menu.open {
            display: block;
        }
        .mobile-menu a {
            display: block;
            padding: 12px 16px;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            margin-bottom: 4px;
        }
        .mobile-menu a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .mobile-menu a.active {
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }

        /* ===== 分类页 Hero（深色面板） ===== */
        .cat-hero {
            position: relative;
            padding: calc(var(--header-h) + 64px) 0 96px;
            background: linear-gradient(135deg, #0F172A 0%, #1E3A5F 55%, #16283F 100%);
            overflow: hidden;
            color: #E2E8F0;
        }
        .cat-hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.jpg');
            background-size: cover;
            background-position: center;
            opacity: .25;
            mix-blend-mode: luminosity;
        }
        /* 可替换为 /assets/images/backpic */
        .cat-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(255, 255, 255, .035) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, .035) 1px, transparent 1px);
            background-size: 36px 36px;
            z-index: 1;
        }
        .cat-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(15, 23, 42, .88) 0%, rgba(15, 23, 42, .62) 60%, rgba(30, 58, 95, .45) 100%);
            z-index: 1;
        }
        .cat-hero-inner {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1.05fr .95fr;
            gap: 60px;
            align-items: center;
        }
        .cat-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 500;
            color: #94A3B8;
            margin-bottom: 18px;
        }
        .cat-breadcrumb a {
            color: #94A3B8;
            transition: color .2s;
        }
        .cat-breadcrumb a:hover {
            color: #BFDBFE;
        }
        .cat-breadcrumb .sep {
            color: #64748B;
        }
        .cat-breadcrumb .current {
            color: #BFDBFE;
        }
        .cat-hero h1 {
            font-size: clamp(30px, 5vw, 44px);
            font-weight: 800;
            line-height: 1.2;
            color: #F8FAFC;
            margin-bottom: 20px;
            letter-spacing: .5px;
        }
        .cat-hero h1 .highlight {
            color: #93C5FD;
        }
        .cat-hero-desc {
            font-size: 15px;
            line-height: 1.75;
            color: #CBD5E1;
            max-width: 520px;
            margin-bottom: 32px;
        }
        .cat-hero-desc strong {
            color: #F8FAFC;
            font-weight: 600;
        }
        .cat-hero-btns {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .cat-hero-btns .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .cat-hero-btns .btn-glass {
            background: rgba(255, 255, 255, .08);
            border: 1px solid rgba(255, 255, 255, .18);
            color: #E2E8F0;
            backdrop-filter: blur(6px);
        }
        .cat-hero-btns .btn-glass:hover {
            background: rgba(255, 255, 255, .14);
            border-color: rgba(255, 255, 255, .3);
        }

        /* 数据榜单 */
        .data-board {
            background: rgba(255, 255, 255, .06);
            border: 1px solid rgba(255, 255, 255, .1);
            border-radius: 16px;
            padding: 28px;
            backdrop-filter: blur(8px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, .25);
        }
        .data-board-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 18px;
        }
        .data-board-header h3 {
            font-size: 16px;
            font-weight: 700;
            color: #F8FAFC;
        }
        .data-board-header span {
            font-size: 12px;
            color: #94A3B8;
            background: rgba(255, 255, 255, .08);
            padding: 3px 10px;
            border-radius: 999px;
        }
        .data-board-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 16px;
            border-radius: 12px;
            margin-bottom: 10px;
            background: rgba(255, 255, 255, .04);
            border: 1px solid rgba(255, 255, 255, .06);
            transition: all .25s ease;
        }
        .data-board-item:hover {
            background: rgba(255, 255, 255, .1);
            border-color: rgba(147, 197, 253, .3);
            transform: translateX(4px);
        }
        .data-board-rank {
            font-size: 13px;
            font-weight: 800;
            color: #93C5FD;
            background: rgba(37, 99, 235, .25);
            width: 34px;
            height: 34px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .data-board-info {
            flex: 1;
        }
        .data-board-info .name {
            font-size: 14px;
            font-weight: 600;
            color: #F1F5F9;
            display: block;
            line-height: 1.4;
        }
        .data-board-info .desc {
            font-size: 12px;
            color: #94A3B8;
            display: block;
            margin-top: 2px;
        }
        .data-board-item .value {
            font-size: 15px;
            font-weight: 700;
            color: #F97316;
            white-space: nowrap;
        }

        /* ===== 指标看板 ===== */
        .metric-board {
            margin-top: -44px;
            position: relative;
            z-index: 5;
        }
        .metric-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .metric-card {
            background: #fff;
            border-radius: var(--radius-card);
            padding: 24px 28px;
            box-shadow: var(--shadow-card);
            border: 1px solid #F1F5F9;
            text-align: center;
            transition: all .25s ease;
        }
        .metric-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .metric-card .number {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            letter-spacing: -1px;
        }
        .metric-card .number .unit {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-muted);
            margin-left: 2px;
        }
        .metric-card h4 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-heading);
            margin: 10px 0 4px;
        }
        .metric-card p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ===== 筛选标签行 ===== */
        .filter-row {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            padding: 24px 0 8px;
        }
        .filter-tag {
            display: inline-flex;
            align-items: center;
            padding: 8px 20px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-body);
            background: #fff;
            border: 1px solid var(--border);
            cursor: pointer;
            transition: all .2s ease;
        }
        .filter-tag:hover {
            background: var(--primary-light);
            border-color: var(--primary-border);
            color: var(--primary);
        }
        .filter-tag.active {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(37, 99, 235, .2);
        }

        /* ===== 分类内容布局 ===== */
        .category-layout {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 32px;
            padding: 32px 0 16px;
            align-items: start;
        }
        .card-list {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .video-card {
            display: flex;
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: all .25s ease;
            border: 1px solid #F1F5F9;
            cursor: pointer;
        }
        .video-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-border);
        }
        .video-card-media {
            width: 280px;
            flex-shrink: 0;
            position: relative;
            min-height: 180px;
            overflow: hidden;
        }
        .video-card-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }
        .video-card:hover .video-card-media img {
            transform: scale(1.04);
        }
        .video-card-media .type-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(15, 23, 42, .75);
            color: #F8FAFC;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            backdrop-filter: blur(4px);
        }
        .video-card-body {
            flex: 1;
            padding: 22px 26px;
            display: flex;
            flex-direction: column;
        }
        .video-card-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .video-card-body p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 14px;
        }
        .video-card-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-bottom: 14px;
        }
        .video-card-tags .tag {
            font-size: 12px;
            font-weight: 500;
            padding: 3px 10px;
            border-radius: 6px;
            background: var(--primary-light);
            color: var(--primary);
        }
        .video-card-tags .tag.gray {
            background: #F1F5F9;
            color: var(--text-muted);
        }
        .video-card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            transition: gap .2s ease;
            align-self: flex-start;
        }
        .video-card-link:hover {
            gap: 10px;
            color: var(--primary-hover);
        }
        .video-card-link svg {
            width: 14px;
            height: 14px;
        }

        /* 侧栏 */
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
            position: sticky;
            top: calc(var(--header-h) + 24px);
        }
        .side-card {
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border: 1px solid #F1F5F9;
            padding: 24px;
        }
        .side-card h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-heading);
            margin-bottom: 16px;
            position: relative;
            padding-bottom: 12px;
        }
        .side-card h4::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 32px;
            height: 3px;
            border-radius: 2px;
            background: var(--primary);
        }
        .advantage-item {
            display: flex;
            gap: 12px;
            padding: 10px 0;
            border-bottom: 1px dashed #E2E8F0;
            align-items: flex-start;
        }
        .advantage-item:last-child {
            border-bottom: none;
        }
        .advantage-item .icon {
            width: 28px;
            height: 28px;
            border-radius: 8px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 14px;
            font-weight: 700;
        }
        .advantage-item .txt {
            font-size: 14px;
            line-height: 1.6;
        }
        .advantage-item .txt strong {
            display: block;
            font-size: 14px;
            color: var(--text-heading);
            margin-bottom: 2px;
        }
        .advantage-item .txt span {
            font-size: 13px;
            color: var(--text-muted);
        }
        .hot-questions li {
            padding: 10px 0;
            border-bottom: 1px solid #F1F5F9;
        }
        .hot-questions li:last-child {
            border-bottom: none;
        }
        .hot-questions a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-body);
            font-weight: 500;
            transition: color .2s;
        }
        .hot-questions a:hover {
            color: var(--primary);
        }
        .hot-questions a::before {
            content: '›';
            color: var(--primary);
            font-size: 18px;
            font-weight: 700;
            line-height: 1;
        }

        /* ===== 分页条 ===== */
        .pagination {
            display: flex;
            justify-content: center;
            gap: 8px;
            padding: 40px 0 16px;
        }
        .page-item {
            min-width: 40px;
            height: 40px;
            padding: 0 8px;
            border-radius: 10px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-body);
            background: #fff;
            border: 1px solid var(--border);
            transition: all .2s ease;
        }
        .page-item:hover {
            background: var(--primary-light);
            border-color: var(--primary-border);
            color: var(--primary);
        }
        .page-item.active {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(37, 99, 235, .2);
        }
        .page-item.next {
            gap: 4px;
        }

        /* ===== 结果对比区 ===== */
        .compare-section {
            background: #fff;
            border-radius: 20px;
            padding: 48px 48px 40px;
            box-shadow: var(--shadow-card);
            border: 1px solid #F1F5F9;
        }
        .compare-title {
            text-align: center;
            margin-bottom: 32px;
        }
        .compare-title h2 {
            font-size: 28px;
            font-weight: 800;
            color: var(--text-heading);
            margin-bottom: 6px;
        }
        .compare-title p {
            font-size: 14px;
            color: var(--text-muted);
        }
        .compare-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
        }
        .compare-col h3 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .compare-col.pain h3 {
            color: #64748B;
        }
        .compare-col.win h3 {
            color: var(--primary);
        }
        .compare-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 12px 16px;
            border-radius: 10px;
            margin-bottom: 10px;
            font-size: 14px;
            line-height: 1.6;
            background: #F8FAFC;
        }
        .compare-col.pain .compare-item {
            color: #64748B;
        }
        .compare-col.win .compare-item {
            background: var(--primary-light);
            color: var(--text-heading);
            font-weight: 500;
        }
        .compare-item .sym {
            font-size: 14px;
            font-weight: 700;
            flex-shrink: 0;
            margin-top: 2px;
        }
        .compare-col.pain .sym {
            color: #94A3B8;
        }
        .compare-col.win .sym {
            color: #10B981;
        }
        .compare-summary {
            margin-top: 28px;
            background: linear-gradient(135deg, var(--primary-light), #F0F9FF);
            border: 1px solid var(--primary-border);
            border-radius: 12px;
            padding: 18px 24px;
            text-align: center;
            font-size: 15px;
            font-weight: 600;
            color: var(--text-heading);
        }
        .compare-summary span {
            color: var(--primary);
        }

        /* ===== FAQ区 ===== */
        .faq-section {
            padding: var(--space-section) 0;
        }
        .faq-inner {
            max-width: 860px;
            margin: 0 auto;
        }
        .faq-title {
            text-align: center;
            margin-bottom: 40px;
        }
        .faq-title h2 {
            font-size: 28px;
            font-weight: 800;
            color: var(--text-heading);
            margin-bottom: 8px;
        }
        .faq-title p {
            font-size: 14px;
            color: var(--text-muted);
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 14px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color .25s, box-shadow .25s;
        }
        .faq-item.active {
            border-color: var(--primary-border);
            box-shadow: 0 4px 16px rgba(37, 99, 235, .07);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            padding: 18px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-heading);
            background: transparent;
            cursor: pointer;
            text-align: left;
            transition: background .2s;
            gap: 16px;
        }
        .faq-question:hover {
            background: var(--primary-light);
        }
        .faq-icon {
            font-size: 20px;
            font-weight: 400;
            color: var(--primary);
            transition: transform .3s ease;
            flex-shrink: 0;
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
        }
        .faq-item.active .faq-icon {
            transform: rotate(135deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }
        .faq-answer p {
            padding: 0 24px 20px;
            font-size: 14px;
            line-height: 1.75;
            color: var(--text-body);
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
        }

        /* ===== 转化表单区 ===== */
        .cta-form {
            padding: 0 0 var(--space-section);
        }
        .form-box {
            max-width: 680px;
            margin: 0 auto;
            background: #fff;
            border-radius: 20px;
            box-shadow: var(--shadow-card);
            border: 1px solid #F1F5F9;
            padding: 44px 48px;
            position: relative;
            overflow: hidden;
        }
        .form-box::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
        }
        .form-header {
            text-align: center;
            margin-bottom: 28px;
        }
        .form-header h2 {
            font-size: 26px;
            font-weight: 800;
            color: var(--text-heading);
            margin-bottom: 8px;
        }
        .form-header p {
            font-size: 14px;
            color: var(--text-muted);
        }
        .form-fields {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
        }
        .form-field input,
        .form-field select,
        .form-field textarea {
            width: 100%;
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 12px 16px;
            font-size: 14px;
            background: #F8FAFC;
            color: var(--text-heading);
            transition: all .2s ease;
        }
        .form-field input:focus,
        .form-field select:focus,
        .form-field textarea:focus {
            border-color: var(--primary);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
        }
        .form-field input::placeholder,
        .form-field textarea::placeholder {
            color: #94A3B8;
        }
        .form-field textarea {
            min-height: 100px;
            resize: vertical;
        }
        .form-submit {
            margin-top: 8px;
            width: 100%;
        }
        .form-trust {
            text-align: center;
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
        }
        .form-trust svg {
            width: 14px;
            height: 14px;
            color: #10B981;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--footer-bg);
            color: #94A3B8;
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, .08);
        }
        .footer-brand .brand {
            color: #F8FAFC;
            margin-bottom: 14px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: #94A3B8;
            max-width: 360px;
        }
        .footer-col h5 {
            font-size: 15px;
            font-weight: 600;
            color: #F1F5F9;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: #94A3B8;
            padding: 6px 0;
            transition: color .2s;
        }
        .footer-col a:hover {
            color: #F8FAFC;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: #64748B;
            padding: 20px 0;
            flex-wrap: wrap;
            gap: 8px;
        }

        /* ===== 响应式 ===== */
        @media (max-width:1024px) {
            .cat-hero-inner {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            .cat-hero {
                padding-bottom: 70px;
            }
            .data-board {
                max-width: 640px;
            }
            .metric-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .category-layout {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .sidebar {
                position: static;
                flex-direction: row;
                flex-wrap: wrap;
                gap: 20px;
            }
            .side-card {
                flex: 1;
                min-width: 260px;
            }
            .compare-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .video-card-media {
                width: 240px;
            }
        }
        @media (max-width:768px) {
            :root {
                --space-section: 56px;
            }
            .nav-links,
            .nav-cta .badge-online {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .nav-cta .btn {
                padding: 8px 16px;
                font-size: 13px;
            }
            .cat-hero {
                padding: calc(var(--header-h) + 40px) 0 60px;
            }
            .cat-hero-inner {
                gap: 32px;
            }
            .cat-hero h1 {
                font-size: 30px;
                line-height: 1.25;
            }
            .cat-hero-btns .btn {
                width: calc(50% - 8px);
                padding: 12px 16px;
                font-size: 14px;
            }
            .data-board {
                padding: 20px;
            }
            .metric-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .metric-card {
                padding: 18px 14px;
            }
            .metric-card .number {
                font-size: 26px;
            }
            .video-card {
                flex-direction: column;
            }
            .video-card-media {
                width: 100%;
                min-height: 180px;
                height: 200px;
            }
            .video-card-body {
                padding: 18px 20px;
            }
            .compare-section {
                padding: 28px 20px;
            }
            .compare-grid {
                gap: 24px;
            }
            .form-box {
                padding: 32px 24px;
                border-radius: 16px;
            }
            .form-row {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .container {
                padding: 0 16px;
            }
        }
        @media (max-width:520px) {
            .metric-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
            .metric-card {
                padding: 14px 10px;
            }
            .metric-card .number {
                font-size: 22px;
            }
            .metric-card h4 {
                font-size: 13px;
            }
            .metric-card p {
                font-size: 12px;
            }
            .filter-row {
                gap: 8px;
                padding: 20px 0 4px;
            }
            .filter-tag {
                padding: 6px 14px;
                font-size: 13px;
            }
            .cat-hero-btns {
                flex-direction: column;
            }
            .cat-hero-btns .btn {
                width: 100%;
            }
            .data-board-item {
                padding: 12px;
                gap: 10px;
            }
            .compare-summary {
                font-size: 14px;
                padding: 16px;
            }
            .faq-question {
                padding: 15px 16px;
                font-size: 15px;
            }
            .faq-answer p {
                padding: 0 16px 16px;
            }
        }