/* roulang page: index */
:root {
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --accent: #0EA5E9;
  --bg-light: #EFF6FF;
  --success: #059669;
  --text: #1E293B;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --bg-white: #FFFFFF;
  --bg-mist: #F8FAFC;
  --border: #E2E8F0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 4px 12px rgba(0,0,0,.04);
  --shadow-lg: 0 8px 24px rgba(37,99,235,.10);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Inter, sans-serif;
  background: var(--bg-white);
  color: var(--text);
  line-height: 1.75;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
.container-x { max-width: 80rem; margin: 0 auto; padding: 0 1.25rem; }
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--primary); color: #fff; font-weight: 600; font-size: .95rem;
  padding: .75rem 1.5rem; border-radius: 8px; border: 1px solid transparent;
  transition: all .2s ease;
}
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 8px 20px rgba(37,99,235,.25); }
.btn-primary:active { transform: scale(.98); }
.btn-ghost {
  display: inline-flex; align-items: center; justify-content: center;
  background: #fff; color: var(--primary); font-weight: 600; font-size: .95rem;
  padding: .75rem 1.5rem; border-radius: 8px; border: 1.5px solid #CBD5E1;
  transition: all .2s ease;
}
.btn-ghost:hover { border-color: var(--primary); background: var(--bg-light); }
.btn-outline {
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent; color: var(--primary); font-weight: 600; font-size: .95rem;
  padding: .75rem 1.5rem; border-radius: 8px; border: 1.5px solid #CBD5E1;
  transition: all .2s ease;
}
.btn-outline:hover { border-color: var(--primary); background: var(--bg-light); }
.section-tag {
  display: inline-block; background: var(--bg-light); color: var(--primary);
  font-size: .85rem; font-weight: 600; padding: .25rem .875rem; border-radius: 999px;
}
.section-title { margin-top: .875rem; font-size: 2rem; font-weight: 700; color: var(--text); line-height: 1.3; letter-spacing: -0.01em; }
@media (min-width: 1024px) { .section-title { font-size: 2.25rem; } }
.badge {
  display: inline-flex; align-items: center; gap: .25rem;
  background: #F1F5F9; color: #475569; font-size: .875rem; font-weight: 500;
  padding: .25rem .875rem; border-radius: 999px;
}
.badge-blue { background: var(--bg-light); color: var(--primary); }
.feature-card {
  background: #fff; border: 1px solid var(--border); border-top: 4px solid var(--primary);
  border-radius: 12px; padding: 2rem; box-shadow: var(--shadow-sm);
  transition: all .2s ease; display: flex; flex-direction: column;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.feature-icon {
  width: 48px; height: 48px; background: var(--bg-light); color: var(--primary);
  border-radius: 12px; display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; flex-shrink: 0;
}
.read-more {
  display: inline-flex; align-items: center; color: var(--primary);
  font-size: .875rem; font-weight: 500; margin-top: auto; padding-top: 1rem;
}
.read-more:hover { text-decoration: underline; }
.step-dot {
  position: absolute; left: 0; top: 0; width: 40px; height: 40px; border-radius: 999px;
  background: var(--primary); color: #fff; display: flex; align-items: center;
  justify-content: center; font-weight: 700; box-shadow: 0 4px 12px rgba(37,99,235,.3);
}
.step-item { position: relative; padding-left: 3.5rem; }
.step-item::before {
  content: ''; position: absolute; left: 20px; top: 44px; bottom: -32px;
  width: 2px; background: var(--border);
}
.step-item:last-child::before { display: none; }
.stat-card {
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  padding: 1.75rem 1.5rem; text-align: center; box-shadow: var(--shadow-sm);
  transition: all .2s ease;
}
.stat-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.stat-num { font-size: 2.25rem; font-weight: 700; color: var(--primary); line-height: 1.2; }
.stat-label { margin-top: .5rem; font-size: .9rem; color: var(--text-secondary); }
.faq-item {
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden; transition: all .2s ease;
}
.faq-item.active { border-color: var(--primary); box-shadow: 0 4px 16px rgba(37,99,235,.08); }
.faq-toggle {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 1.125rem 1.5rem; font-size: 1rem; font-weight: 600; color: var(--text);
  background: transparent; border: none; text-align: left; transition: color .2s;
}
.faq-item.active .faq-toggle { color: var(--primary); }
.faq-icon {
  width: 24px; height: 24px; border-radius: 999px; background: var(--bg-light);
  color: var(--primary); display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; transition: transform .25s ease, background .25s ease, color .25s ease;
  flex-shrink: 0;
}
.faq-item.active .faq-icon { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-content { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-item.active .faq-content { max-height: 400px; }
.faq-content-inner { padding: 0 1.5rem 1.25rem; font-size: .925rem; color: var(--text-secondary); line-height: 1.8; }
.nav-link {
  position: relative; font-size: .95rem; font-weight: 500; color: var(--text-secondary);
  transition: color .2s; white-space: nowrap;
}
.nav-link:hover { color: var(--primary); }
.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-link.active::after {
  content: ''; position: absolute; left: 0; bottom: -.375rem; width: 100%;
  height: 2px; background: var(--primary); border-radius: 2px;
}
.line-clamp-2 {
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.price-check {
  width: 20px; height: 20px; border-radius: 999px; background: var(--bg-light);
  color: var(--success); display: inline-flex; align-items: center; justify-content: center;
  font-size: .75rem; font-weight: 700; flex-shrink: 0;
}
.card-hover { transition: all .2s ease; }
.card-hover:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.news-card {
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  padding: 1.25rem 1.5rem; box-shadow: var(--shadow-sm);
  transition: all .2s ease; display: block;
}
.news-card:hover {
  transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--primary);
}
.footer-link { color: var(--text-muted); font-size: .9rem; transition: color .2s; }
.footer-link:hover { color: #fff; }
.float-cta {
  position: fixed; bottom: 1.5rem; right: 1.5rem; z-index: 50;
  width: 56px; height: 56px; border-radius: 999px; background: var(--primary);
  color: #fff; font-weight: 700; font-size: .9rem; display: flex; align-items: center;
  justify-content: center; box-shadow: 0 12px 32px rgba(37,99,235,.35);
  transition: all .2s ease; border: none;
}
.float-cta:hover { background: var(--primary-hover); transform: scale(1.05); }
.float-panel {
  position: fixed; bottom: 6rem; right: 1.5rem; z-index: 50; width: 260px;
  background: #fff; border-radius: 16px; box-shadow: 0 16px 48px rgba(0,0,0,.12);
  border: 1px solid var(--border); padding: 1.25rem;
}
@keyframes float-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
.float-panel.show { animation: float-in .25s ease; }
@media (max-width: 640px) {
  .float-cta { width: 48px; height: 48px; bottom: 1rem; right: 1rem; }
  .float-panel { bottom: 4.75rem; right: 1rem; width: 240px; }
}

/* roulang page: category1 */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --accent: #0EA5E9;
  --accent-light: #EFF6FF;
  --ink: #1E293B;
  --muted: #64748B;
  --faint: #94A3B8;
  --surface: #F8FAFC;
  --border: #E2E8F0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
  --shadow-lg: 0 8px 24px rgba(37,99,235,0.10);
}
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", sans-serif;
  background: #fff;
  color: var(--ink);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
.container-x {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.section-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--ink);
}
@media (max-width: 640px) {
  .section-title { font-size: 26px; }
}
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: 8px;
  border: 1px solid var(--primary);
  transition: background .18s ease, box-shadow .18s ease, transform .18s ease;
}
.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 8px 20px rgba(37,99,235,0.25);
  transform: translateY(-1px);
}
.btn-primary:active { transform: scale(0.98); }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #fff;
  color: var(--primary);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: 8px;
  border: 1.5px solid #CBD5E1;
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
.btn-ghost:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 14px rgba(37,99,235,0.08);
  transform: translateY(-1px);
}
.btn-ghost:active { transform: scale(0.98); }
.btn-white {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: var(--primary);
  font-size: 15px;
  font-weight: 700;
  padding: 13px 30px;
  border-radius: 8px;
  transition: background .18s ease, box-shadow .18s ease, transform .18s ease;
}
.btn-white:hover { background: #F1F5F9; box-shadow: 0 8px 20px rgba(0,0,0,0.12); transform: translateY(-1px); }
.btn-outline-white {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 8px;
  border: 1.5px solid rgba(255,255,255,0.7);
  transition: background .18s ease, transform .18s ease;
}
.btn-outline-white:hover { background: rgba(255,255,255,0.1); transform: translateY(-1px); }
.nav-link {
  position: relative;
  font-size: 15px;
  font-weight: 500;
  color: #475569;
  padding: 6px 2px;
  transition: color .18s ease;
}
.nav-link:hover { color: var(--primary); }
.nav-link.active {
  color: var(--primary);
  font-weight: 600;
}
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}
.footer-link {
  font-size: 14px;
  color: #94A3B8;
  transition: color .18s ease;
}
.footer-link:hover { color: #fff; }
.badge-primary {
  display: inline-block;
  background: var(--accent-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
}
.badge-success {
  display: inline-block;
  background: #D1FAE5;
  color: #059669;
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
}
.icon-box {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  color: var(--primary);
  border-radius: 12px;
}
.text-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color .18s ease, gap .18s ease;
}
.text-link:hover { color: var(--primary-dark); gap: 8px; }
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.faq-item.active {
  border-color: var(--primary);
  box-shadow: 0 4px 16px rgba(37,99,235,0.08);
}
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  background: #fff;
  text-align: left;
  cursor: pointer;
  transition: background .18s ease;
}
.faq-q:hover { background: #F8FAFC; }
.faq-icon {
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--primary);
  font-size: 18px;
  line-height: 1;
  transition: transform .25s ease, background .25s ease;
}
.faq-item.active .faq-icon {
  background: var(--primary);
  color: #fff;
  transform: rotate(45deg);
}
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease;
}
.faq-item.active .faq-a { max-height: 300px; }
.faq-a-inner {
  padding: 0 22px 20px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.8;
}
.float-cta-wrap {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
}
.float-cta-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(37,99,235,0.35);
  border: none;
  cursor: pointer;
  transition: background .18s ease, transform .18s ease;
}
.float-cta-btn:hover { background: var(--primary-dark); transform: scale(1.04); }
.float-cta-card {
  display: none;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(15,23,42,0.15);
  padding: 14px;
  text-align: center;
  width: 160px;
}
.float-cta-wrap:hover .float-cta-card { display: block; }
@media (max-width: 640px) {
  .float-cta-btn { width: 48px; height: 48px; font-size: 17px; }
  .float-cta-wrap { bottom: 18px; right: 18px; }
}
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* roulang page: article */
:root {
    --primary: #2563EB;
    --primary-hover: #1D4ED8;
    --primary-light: #EFF6FF;
    --secondary: #0EA5E9;
    --success: #059669;
    --text-main: #1E293B;
    --text-sub: #64748B;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --bg-soft: #F8FAFC;
    --radius-card: 12px;
    --radius-btn: 8px;
    --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
    --shadow-hover: 0 8px 24px rgba(37,99,235,0.10);
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, sans-serif;
    color: var(--text-main);
    font-size: 15px;
    line-height: 1.75;
    background: #FFFFFF;
    -webkit-font-smoothing: antialiased;
  }

  img {
    max-width: 100%;
    height: auto;
    display: block;
  }

  a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
  }

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

  .container-x {
    width: 100%;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 20px;
    padding-right: 20px;
  }

  @media (min-width: 640px) {
    .container-x {
      padding-left: 24px;
      padding-right: 24px;
    }
  }

  @media (min-width: 1024px) {
    .container-x {
      padding-left: 32px;
      padding-right: 32px;
    }
  }

  /* ===== 导航 ===== */
  .nav-link {
    position: relative;
    font-size: 14px;
    font-weight: 500;
    color: #475569;
    padding: 8px 4px;
    white-space: nowrap;
    transition: color 0.2s ease;
  }

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

  .nav-link.active {
    color: var(--primary);
    font-weight: 600;
  }

  .nav-link.active::after {
    content: '';
    position: absolute;
    left: 4px;
    right: 4px;
    bottom: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
  }

  /* ===== 按钮 ===== */
  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: var(--primary);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    padding: 10px 20px;
    border-radius: 8px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
  }

  .btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.18);
  }

  .btn-primary:active {
    transform: scale(0.98);
  }

  .btn-primary:focus-visible {
    outline: 2px solid #93C5FD;
    outline-offset: 2px;
  }

  .btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: #FFFFFF;
    color: var(--primary);
    border: 1.5px solid #CBD5E1;
    font-size: 14px;
    font-weight: 500;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
  }

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

  .btn-outline:active {
    transform: scale(0.98);
  }

  /* ===== 徽章 ===== */
  .badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: #F1F5F9;
    color: #475569;
    font-size: 13px;
    font-weight: 500;
    padding: 4px 12px;
    border-radius: 999px;
    white-space: nowrap;
  }

  .badge-primary {
    background: var(--primary-light);
    color: var(--primary);
  }

  .badge-success {
    background: #D1FAE5;
    color: var(--success);
  }

  /* ===== 页脚链接 ===== */
  .footer-link {
    color: #94A3B8;
    font-size: 14px;
    transition: color 0.2s ease;
  }

  .footer-link:hover {
    color: #FFFFFF;
  }

  /* ===== 文章正文 ===== */
  .article-content {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-main);
    word-wrap: break-word;
  }

  .article-content h2 {
    font-size: 20px;
    font-weight: 700;
    color: #0F172A;
    margin-top: 36px;
    margin-bottom: 16px;
    line-height: 1.4;
  }

  .article-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: #0F172A;
    margin-top: 28px;
    margin-bottom: 12px;
  }

  .article-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: #0F172A;
    margin-top: 22px;
    margin-bottom: 10px;
  }

  .article-content p {
    margin-bottom: 18px;
  }

  .article-content a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 3px;
  }

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

  .article-content ul {
    list-style: none;
    padding-left: 0;
    margin: 20px 0;
  }

  .article-content ul > li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 8px;
  }

  .article-content ul > li::before {
    content: '';
    position: absolute;
    left: 2px;
    top: 11px;
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 999px;
  }

  .article-content ol {
    list-style: none;
    counter-reset: article-step;
    padding-left: 0;
    margin: 20px 0;
  }

  .article-content ol > li {
    position: relative;
    padding-left: 36px;
    margin-bottom: 10px;
    counter-increment: article-step;
  }

  .article-content ol > li::before {
    content: counter(article-step);
    position: absolute;
    left: 0;
    top: 3px;
    width: 22px;
    height: 22px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .article-content blockquote {
    border-left: 4px solid var(--primary);
    background: var(--primary-light);
    border-radius: 8px;
    padding: 16px 20px;
    margin: 24px 0;
    color: #475569;
    font-size: 15px;
  }

  .article-content img {
    border-radius: 8px;
    border: 1px solid var(--border);
    margin: 24px 0;
    width: auto;
  }

  .article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 14px;
  }

  .article-content table th,
  .article-content table td {
    border: 1px solid var(--border);
    padding: 10px 12px;
    text-align: left;
  }

  .article-content table th {
    background: var(--bg-soft);
    font-weight: 600;
  }

  .article-content hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 32px 0;
  }

  .article-content pre {
    background: #0F172A;
    color: #E2E8F0;
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    margin: 24px 0;
    font-size: 14px;
    line-height: 1.6;
  }

  .article-content code {
    background: #F1F5F9;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
  }

  .article-content pre code {
    background: transparent;
    padding: 0;
    color: inherit;
  }

  /* ===== 相关卡片 ===== */
  .article-card {
    transition: all 0.25s ease;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    background: #FFFFFF;
  }

  .article-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: #BFDBFE;
  }

  /* ===== 移动端菜单 ===== */
  .mobile-menu-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.28s ease;
  }

  .mobile-menu-panel.open {
    max-height: 360px;
  }

  /* ===== 响应式 ===== */
  @media (max-width: 768px) {
    .container-x {
      padding-left: 16px;
      padding-right: 16px;
    }

    .article-content {
      font-size: 15px;
      line-height: 1.75;
    }

    .article-content h2 {
      font-size: 18px;
      margin-top: 28px;
    }
  }

/* roulang page: category3 */
:root {
      --primary: #2563EB;
      --primary-hover: #1D4ED8;
      --accent: #0EA5E9;
      --accent-light: #EFF6FF;
      --success: #059669;
      --ink: #1E293B;
      --ink-secondary: #64748B;
      --ink-muted: #94A3B8;
      --line: #E2E8F0;
      --bg-soft: #F8FAFC;
      --radius: 12px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(37,99,235,0.10);
    }
    * {
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, sans-serif;
      color: var(--ink);
      background: #FFFFFF;
      line-height: 1.75;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }
    .container-x {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (min-width: 640px) {
      .container-x {
        padding-left: 32px;
        padding-right: 32px;
      }
    }
    @media (min-width: 1024px) {
      .container-x {
        padding-left: 40px;
        padding-right: 40px;
      }
    }
    .nav-link {
      position: relative;
      font-size: 15px;
      font-weight: 500;
      color: #475569;
      padding: 8px 14px;
      border-radius: 8px;
      text-decoration: none;
      transition: all 0.18s ease;
    }
    .nav-link:hover {
      color: var(--primary);
      background: #F1F5F9;
    }
    .nav-link.active {
      color: var(--primary);
      font-weight: 600;
      background: var(--accent-light);
    }
    .footer-link {
      color: #94A3B8;
      font-size: 14px;
      text-decoration: none;
      transition: color 0.18s ease, padding-left 0.18s ease;
    }
    .footer-link:hover {
      color: #FFFFFF;
      padding-left: 4px;
    }
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: var(--primary);
      color: #FFFFFF;
      font-weight: 600;
      font-size: 15px;
      padding: 13px 28px;
      border-radius: 8px;
      text-decoration: none;
      border: 1.5px solid transparent;
      transition: all 0.18s ease;
      box-shadow: 0 1px 3px rgba(37,99,235,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 8px 24px rgba(37,99,235,0.25);
    }
    .btn-primary:active {
      transform: scale(0.98);
    }
    .btn-ghost {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: #FFFFFF;
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
      padding: 13px 28px;
      border-radius: 8px;
      text-decoration: none;
      border: 1.5px solid #CBD5E1;
      transition: all 0.18s ease;
    }
    .btn-ghost:hover {
      border-color: var(--primary);
      background: #F8FAFC;
      transform: translateY(-1px);
    }
    .btn-ghost:active {
      transform: scale(0.98);
    }
    .badge {
      display: inline-flex;
      align-items: center;
      font-size: 14px;
      background: #F1F5F9;
      color: #475569;
      border-radius: 999px;
      padding: 4px 12px;
      font-weight: 500;
      white-space: nowrap;
    }
    .badge-blue {
      background: var(--accent-light);
      color: var(--primary);
    }
    .badge-green {
      background: #D1FAE5;
      color: var(--success);
    }
    .feature-card {
      background: #FFFFFF;
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-card);
      border-top: 4px solid var(--accent-light);
      transition: all 0.18s ease;
      height: 100%;
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
      border-top-color: var(--primary);
    }
    .step-item {
      position: relative;
      padding-left: 56px;
      padding-bottom: 40px;
    }
    .step-item:last-child {
      padding-bottom: 0;
    }
    .step-item .step-dot {
      position: absolute;
      left: 0;
      top: 0;
      width: 40px;
      height: 40px;
      background: var(--accent-light);
      border: 2px solid var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
      color: var(--primary);
    }
    .step-item::before {
      content: "";
      position: absolute;
      left: 19px;
      top: 48px;
      width: 2px;
      height: calc(100% - 24px);
      background: var(--line);
    }
    .step-item:last-child::before {
      display: none;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 24px 28px;
      transition: border-color 0.18s ease, box-shadow 0.18s ease;
    }
    .faq-item.active {
      border-color: var(--primary);
      box-shadow: var(--shadow-card);
      background: #F8FAFC;
    }
    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
      font-size: 16px;
      color: var(--ink);
      gap: 16px;
    }
    .faq-icon {
      width: 24px;
      height: 24px;
      flex-shrink: 0;
      border-radius: 50%;
      background: var(--accent-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      font-weight: 300;
      transition: transform 0.3s ease, background 0.3s ease;
      line-height: 1;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      background: var(--primary);
      color: #FFFFFF;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--ink-secondary);
      font-size: 14px;
      line-height: 1.8;
    }
    .faq-item.active .faq-answer {
      max-height: 500px;
      padding-top: 16px;
    }
    .floating-cta {
      position: fixed;
      bottom: 24px;
      right: 24px;
      z-index: 50;
    }
    .floating-cta .expand-card {
      opacity: 0;
      pointer-events: none;
      transform: translateY(12px);
      transition: all 0.2s ease;
    }
    .floating-cta:hover .expand-card,
    .floating-cta:focus-within .expand-card {
      opacity: 1;
      pointer-events: auto;
      transform: translateY(0);
    }
    @media (max-width: 640px) {
      .floating-cta {
        bottom: 16px;
        right: 16px;
      }
    }
    .hero-bg {
      background: linear-gradient(180deg, #EFF6FF 0%, #FFFFFF 100%);
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }
    .stat-card {
      background: #FFFFFF;
      border-radius: var(--radius);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: all 0.18s ease;
      border-bottom: 3px solid transparent;
    }
    .stat-card:hover {
      border-bottom-color: var(--primary);
      box-shadow: var(--shadow-hover);
    }
    .step-card {
      background: #FFFFFF;
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--primary);
      transition: all 0.18s ease;
    }
    .step-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateX(3px);
    }
    .list-check li {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      margin-bottom: 12px;
    }
    .list-check .check-icon {
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: #D1FAE5;
      color: var(--success);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      margin-top: 3px;
      font-size: 12px;
    }
    @media (max-width: 768px) {
      .step-item {
        padding-left: 48px;
      }
      .step-item .step-dot {
        width: 34px;
        height: 34px;
        font-size: 14px;
      }
      .step-item::before {
        left: 16px;
      }
    }

/* roulang page: category2 */
:root {
      --color-primary: #2563eb;
      --color-primary-hover: #1d4ed8;
      --color-secondary: #0ea5e9;
      --color-surface: #eff6ff;
      --color-success: #059669;
      --color-text: #1e293b;
      --color-text-secondary: #64748b;
      --color-text-muted: #94a3b8;
      --color-bg: #ffffff;
      --color-bg-alt: #f8fafc;
      --color-border: #e2e8f0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(37,99,235,0.10);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, sans-serif;
      color: var(--color-text);
      background: var(--color-bg);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    .container-x {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--color-text-secondary);
      padding: 0.375rem 0;
      border-bottom: 2px solid transparent;
      transition: color .18s ease, border-color .18s ease;
    }
    .nav-link:hover { color: var(--color-primary); }
    .nav-link.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: var(--color-primary);
      color: #fff;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 0.75rem 1.75rem;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: background .18s ease, box-shadow .18s ease, transform .18s ease;
      box-shadow: 0 2px 8px rgba(37,99,235,0.20);
    }
    .btn-primary:hover { background: var(--color-primary-hover); box-shadow: 0 6px 18px rgba(37,99,235,0.25); transform: translateY(-1px); }
    .btn-primary:active { transform: scale(0.98); }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: #fff;
      color: var(--color-primary);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 0.75rem 1.75rem;
      border-radius: var(--radius-btn);
      border: 1.5px solid #cbd5e1;
      cursor: pointer;
      transition: border-color .18s ease, color .18s ease, box-shadow .18s ease, transform .18s ease;
    }
    .btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); box-shadow: 0 4px 12px rgba(37,99,235,0.08); transform: translateY(-1px); }
    .btn-outline:active { transform: scale(0.98); }
    .btn-white {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      background: #fff;
      color: var(--color-primary);
      font-weight: 700;
      font-size: 1rem;
      padding: 0.875rem 2rem;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: background .18s ease, box-shadow .18s ease, transform .18s ease;
      box-shadow: 0 4px 16px rgba(0,0,0,0.10);
    }
    .btn-white:hover { background: #f8fafc; box-shadow: 0 8px 24px rgba(0,0,0,0.14); transform: translateY(-2px); }
    .card {
      background: #fff;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 2rem;
      border: 1px solid rgba(226, 232, 240, 0.6);
      transition: box-shadow .2s ease, transform .2s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .icon-box {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: var(--color-primary);
      background: var(--color-surface);
    }
    .badge {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 600;
      padding: 0.25rem 0.875rem;
      border-radius: 999px;
      background: var(--color-surface);
      color: var(--color-primary);
      letter-spacing: 0.02em;
    }
    .price-badge {
      background: linear-gradient(135deg, #f59e0b, #d97706);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.2rem 0.8rem;
      border-radius: 999px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      white-space: nowrap;
    }
    .footer-link {
      color: var(--color-text-muted);
      font-size: 0.875rem;
      transition: color .18s ease;
    }
    .footer-link:hover { color: #fff; }
    .search-input {
      width: 180px;
      height: 40px;
      border-radius: 999px;
      background: #f1f5f9;
      border: 1px solid transparent;
      padding: 0 1rem 0 2.5rem;
      font-size: 0.875rem;
      color: var(--color-text);
      outline: none;
      transition: border-color .18s ease, box-shadow .18s ease, width .2s ease;
    }
    .search-input:focus {
      border-color: var(--color-primary);
      box-shadow: 0 0 0 4px rgba(37,99,235,0.10);
      width: 220px;
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-card);
      padding: 1.25rem 1.5rem;
      cursor: pointer;
      transition: box-shadow .18s ease, border-color .18s ease;
    }
    .faq-item:hover { border-color: var(--color-primary); }
    .faq-item.open { border-color: var(--color-primary); box-shadow: var(--shadow-hover); }
    .faq-question {
      font-size: 1rem;
      font-weight: 600;
      color: var(--color-text);
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 1rem;
    }
    .faq-icon {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: var(--color-surface);
      color: var(--color-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9rem;
      transition: transform .25s ease, background .25s ease;
      flex-shrink: 0;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
      background: var(--color-primary);
      color: #fff;
    }
    .faq-answer { display: none; margin-top: 0.75rem; font-size: 0.925rem; color: var(--color-text-secondary); line-height: 1.8; }
    .faq-item.open .faq-answer { display: block; }
    .timeline-item { position: relative; padding-left: 2.5rem; padding-bottom: 2rem; }
    .timeline-item::before {
      content: "";
      position: absolute;
      left: 0.75rem;
      top: 1.75rem;
      bottom: 0;
      width: 2px;
      background: #e2e8f0;
    }
    .timeline-item:last-child::before { display: none; }
    .timeline-dot {
      position: absolute;
      left: 0;
      top: 0.25rem;
      width: 1.5rem;
      height: 1.5rem;
      border-radius: 50%;
      background: var(--color-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      box-shadow: 0 0 0 4px rgba(37,99,235,0.15);
    }
    .stat-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: box-shadow .2s ease, transform .2s ease;
    }
    .stat-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
    .stat-number {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--color-primary);
      line-height: 1.2;
    }
    .float-cta {
      position: fixed;
      right: 1.5rem;
      bottom: 1.5rem;
      z-index: 50;
    }
    .float-cta-main {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: var(--color-primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 0 8px 28px rgba(37,99,235,0.30);
      cursor: pointer;
      transition: background .18s ease, transform .18s ease, box-shadow .18s ease;
      border: none;
    }
    .float-cta-main:hover { background: var(--color-primary-hover); transform: scale(1.05); }
    .float-cta-main:active { transform: scale(0.96); }
    .float-cta-card {
      position: absolute;
      right: 4rem;
      bottom: 0;
      background: #fff;
      border-radius: 12px;
      box-shadow: 0 16px 48px rgba(0,0,0,0.14);
      padding: 1rem 1.25rem;
      width: 200px;
      display: none;
    }
    .float-cta:hover .float-cta-card { display: block; }
    @media (max-width: 768px) {
      .container-x { padding-left: 1rem; padding-right: 1rem; }
      .float-cta { right: 1rem; bottom: 1rem; }
      .float-cta-main { width: 48px; height: 48px; font-size: 0.8rem; }
      .float-cta-card { right: 3.5rem; width: 180px; }
      .search-desktop { display: none; }
    }
    .hero-bg {
      background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 55%, #ffffff 100%);
    }
    .cta-gradient {
      background: linear-gradient(135deg, var(--color-primary) 0%, #1d4ed8 100%);
    }
    .section-alt { background: var(--color-bg-alt); }
    .section-surface { background: var(--color-surface); }
    .feature-list li {
      display: flex;
      align-items: flex-start;
      gap: 0.625rem;
      font-size: 0.925rem;
      color: var(--color-text-secondary);
      padding: 0.35rem 0;
    }
    .feature-list li i { color: var(--color-success); margin-top: 0.25rem; }