/* roulang page: index */
:root {
  --primary: #2B7DE9;
  --primary-dark: #1E62C8;
  --primary-light: #EAF1FB;
  --accent: #F59E0B;
  --success: #10B981;
  --bg: #F6F8FB;
  --card: #FFFFFF;
  --blue-bg: #F0F4FA;
  --text-title: #1E293B;
  --text-body: #475569;
  --text-muted: #94A3B8;
  --border: #E2E8F0;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow: 0 1px 3px rgba(15,23,42,0.06), 0 4px 12px rgba(15,23,42,0.04);
  --shadow-hover: 0 4px 8px rgba(15,23,42,0.08), 0 12px 24px rgba(15,23,42,0.06);
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--text-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226,232,240,0.8);
  transition: box-shadow .3s ease;
}
.site-header.scrolled { box-shadow: 0 4px 20px rgba(15,23,42,0.06); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 800; color: var(--text-title); letter-spacing: -0.01em; white-space: nowrap; }
.brand svg { color: var(--primary); flex-shrink: 0; }
.main-nav { display: flex; gap: 28px; align-items: center; }
.main-nav a { font-size: 15px; font-weight: 500; color: var(--text-body); padding: 6px 2px; border-bottom: 2px solid transparent; transition: all .2s ease; text-decoration: none; }
.main-nav a:hover { color: var(--primary); border-color: var(--primary); }
.main-nav a.active { color: var(--primary); border-color: var(--primary); font-weight: 600; }
.nav-cta { display: flex; gap: 12px; align-items: center; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font-weight: 600; border-radius: 999px; transition: all .25s ease;
  padding: 10px 22px; font-size: 14px; line-height: 1.2;
  border: none; cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:focus-visible { outline: 3px solid rgba(59,130,246,0.3); outline-offset: 2px; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-primary:active { transform: translateY(0); box-shadow: var(--shadow); }
.btn-secondary { background: #fff; color: var(--primary); border: 1px solid var(--primary); box-shadow: var(--shadow); }
.btn-secondary:hover { background: var(--primary-light); border-color: var(--primary-dark); }
.btn-lg { padding: 16px 40px; font-size: 16px; }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn-block { width: 100%; }
.nav-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--border);
  background: #fff; color: var(--text-title); cursor: pointer;
  transition: border-color .2s, background .2s;
}
.nav-toggle:hover { border-color: var(--primary); color: var(--primary); }
.nav-toggle:focus-visible { outline: 3px solid rgba(59,130,246,0.3); }
.mobile-panel {
  display: none;
  position: absolute; top: 72px; left: 0; right: 0;
  background: #fff; border-bottom: 1px solid var(--border);
  padding: 16px 24px; flex-direction: column; gap: 4px;
  box-shadow: var(--shadow-hover); z-index: 99;
}
.mobile-panel.open { display: flex; }
.mobile-panel a { padding: 12px 0; font-size: 15px; font-weight: 500; color: var(--text-body); text-decoration: none; border-bottom: 1px solid #F1F5F9; }
.mobile-panel a:last-child { border-bottom: none; }
.mobile-panel a.active { color: var(--primary); }
.section { padding: 80px 0; }
.section-title { font-size: 32px; font-weight: 800; color: var(--text-title); letter-spacing: -0.02em; }
.section-subtitle { font-size: 15px; color: var(--text-muted); margin-top: 12px; }
.hero-section {
  position: relative; padding: 88px 0 96px; overflow: hidden;
  background: linear-gradient(180deg, #F0F4FA 0%, #F6F8FB 100%);
}
.hero-dots {
  position: absolute; right: 4%; top: 10%;
  width: 140px; height: 140px;
  background-image: radial-gradient(circle, rgba(43,125,233,0.18) 2px, transparent 2px);
  background-size: 18px 18px;
  pointer-events: none; border-radius: 50%; z-index: 0;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  background: #fff; color: var(--primary);
  font-size: 13px; font-weight: 600; padding: 6px 14px;
  border-radius: 999px; border: 1px solid rgba(43,125,233,0.15);
  box-shadow: var(--shadow); margin-bottom: 20px;
}
.hero-visual {
  aspect-ratio: 4/5; border-radius: 18px; position: relative; overflow: hidden;
  box-shadow: var(--shadow-hover); border: 1px solid rgba(226,232,240,0.6);
}
.hero-visual img { width: 100%; height: 100%; object-fit: cover; display: block; }
.hero-visual::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(15,23,42,0.12) 100%);
  pointer-events: none;
}
.hero-badge {
  position: absolute; left: 16px; bottom: 16px; z-index: 2;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(4px);
  border-radius: 999px; padding: 6px 14px;
  font-size: 13px; font-weight: 600; color: var(--primary);
  box-shadow: var(--shadow); border: 1px solid rgba(43,125,233,0.1);
}
.trust-item { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-body); }
.trust-item svg { color: var(--success); flex-shrink: 0; }
.video-card {
  background: #fff; border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow); border: 1px solid var(--border);
  transition: all .3s ease; text-decoration: none; display: block;
}
.video-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); border-color: rgba(43,125,233,0.25); }
.video-cover { position: relative; aspect-ratio: 9/16; overflow: hidden; }
.video-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }
.video-cover::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(15,23,42,0.35) 100%);
  pointer-events: none;
}
.type-tag {
  position: absolute; top: 12px; left: 12px; z-index: 2;
  background: var(--primary-light); color: var(--primary);
  font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 999px;
}
.hot-badge {
  position: absolute; top: 12px; right: 12px; z-index: 2;
  background: var(--accent); color: #fff;
  font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 999px;
}
.seed-item {
  display: flex; gap: 16px; align-items: flex-start; padding: 20px;
  background: #fff; border-radius: var(--radius-lg);
  border: 1px solid var(--border); box-shadow: var(--shadow);
  transition: all .3s ease;
}
.seed-item:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); border-color: rgba(43,125,233,0.2); }
.seed-num {
  flex-shrink: 0; width: 40px; height: 40px; border-radius: 50%;
  background: var(--primary-light); color: var(--primary);
  font-weight: 700; font-size: 17px;
  display: flex; align-items: center; justify-content: center;
}
.seed-title { font-size: 16px; font-weight: 600; color: var(--text-title); }
.seed-desc { font-size: 13px; color: var(--text-muted); margin-top: 4px; line-height: 1.6; }
.comment-card {
  background: #fff; border-radius: var(--radius-lg); padding: 24px;
  border: 1px solid var(--border); box-shadow: var(--shadow);
  transition: all .3s ease; height: 100%;
}
.comment-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.comment-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), #93C5FD);
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 16px; flex-shrink: 0;
}
.stars { color: var(--accent); letter-spacing: 2px; font-size: 14px; }
.cta-box {
  position: relative; text-align: center;
  background: rgba(43,125,233,0.08);
  border-radius: 24px; padding: 64px 32px; overflow: hidden;
  border: 1px solid rgba(43,125,233,0.12);
}
.cta-dots {
  position: absolute; width: 220px; height: 220px; left: -40px; bottom: -60px;
  background-image: radial-gradient(circle, rgba(43,125,233,0.15) 2px, transparent 2px);
  background-size: 20px 20px; border-radius: 50%; pointer-events: none;
}
.news-card {
  display: flex; gap: 20px; padding: 20px;
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow);
  text-decoration: none; transition: all .3s ease;
}
.news-card:hover { box-shadow: var(--shadow-hover); border-color: rgba(43,125,233,0.35); transform: translateY(-2px); }
.news-thumb {
  flex-shrink: 0; width: 220px; height: 138px;
  border-radius: 12px; overflow: hidden; background: var(--primary-light);
}
.news-thumb img { width: 100%; height: 100%; object-fit: cover; }
.news-content { flex: 1; min-width: 0; display: flex; flex-direction: column; justify-content: center; }
.news-content h3 { font-size: 17px; font-weight: 600; color: var(--text-title); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.news-content p { font-size: 15px; color: var(--text-body); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-top: 6px; line-height: 1.6; }
.news-meta { display: flex; align-items: center; gap: 12px; margin-top: 12px; font-size: 14px; color: var(--text-muted); flex-wrap: wrap; }
.tag { background: var(--primary-light); color: var(--primary); font-size: 12px; font-weight: 600; padding: 2px 10px; border-radius: 999px; }
.read-more { color: var(--primary); font-size: 14px; font-weight: 500; }
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 48px 24px; gap: 12px;
  background: #fff; border: 1px dashed var(--border); border-radius: var(--radius-lg);
  color: var(--text-muted); font-size: 15px;
}
.faq-item {
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 24px;
  border-left: 4px solid var(--primary);
  box-shadow: var(--shadow); transition: box-shadow .3s ease, transform .3s ease;
}
.faq-item:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.faq-question {
  font-size: 16px; font-weight: 600; color: var(--text-title);
  cursor: pointer; display: flex; justify-content: space-between;
  align-items: center; gap: 16px;
}
.faq-answer { font-size: 15px; color: var(--text-body); line-height: 1.7; margin-top: 12px; display: none; }
.faq-item.open .faq-answer { display: block; }
.faq-icon { width: 24px; height: 24px; flex-shrink: 0; color: var(--primary); transition: transform .3s ease; }
.faq-item.open .faq-icon { transform: rotate(45deg); }
.site-footer { background: #0F172A; color: #94A3B8; padding: 56px 0 0; }
.site-footer a { color: #94A3B8; text-decoration: none; transition: color .2s ease; }
.site-footer a:hover { color: #fff; }
.footer-title { font-size: 14px; font-weight: 600; color: #E2E8F0; margin-bottom: 16px; letter-spacing: 0.02em; }
.footer-bottom {
  border-top: 1px solid rgba(148,163,184,0.15);
  margin-top: 40px; padding: 20px 0;
  font-size: 13px; color: #64748B;
}
.scrollbar-hide::-webkit-scrollbar { display: none; }
.scrollbar-hide { -ms-overflow-style: none; scrollbar-width: none; }
@media (max-width: 1023px) {
  .main-nav { gap: 16px; }
}
@media (max-width: 767px) {
  .section { padding: 48px 0; }
  .main-nav { display: none; }
  .container { padding: 0 16px; }
  .hero-section { padding: 56px 0 64px; }
  .hero-visual { margin-top: 28px; }
  .section-title { font-size: 26px; }
  .news-card { flex-direction: column; }
  .news-thumb { width: 100%; height: 180px; }
  .news-content h3 { white-space: normal; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
  .cta-box { padding: 48px 20px; }
  .cta-box .btn-lg { width: 100%; }
  .footer-links { flex-wrap: wrap; gap: 24px; }
}
@media (max-width: 520px) {
  .nav-cta .btn-secondary { display: none; }
}

/* roulang page: category1 */
:root {
    --brand: #2B7DE9;
    --brand-dark: #1D4ED8;
    --brand-light: #EFF6FF;
    --accent: #F59E0B;
    --success: #10B981;
    --bg: #F6F8FB;
    --card: #FFFFFF;
    --border: #E2E8F0;
    --text: #1E293B;
    --text-body: #475569;
    --text-muted: #94A3B8;
    --radius: 12px;
    --radius-lg: 16px;
    --shadow: 0 1px 3px rgba(15,23,42,0.06), 0 4px 12px rgba(15,23,42,0.04);
    --shadow-lg: 0 4px 8px rgba(15,23,42,0.08), 0 12px 24px rgba(15,23,42,0.06);
    --font: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    --container: 1200px;
  }

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

  html {
    scroll-behavior: smooth;
  }

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

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

  a {
    text-decoration: none;
    color: inherit;
  }

  button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
  }

  ul {
    list-style: none;
  }

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

  /* ===== Header / Nav ===== */
  .site-header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 20px;
  }

  .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 20px;
    color: var(--text);
    white-space: nowrap;
    transition: color .2s;
  }

  .logo:hover {
    color: var(--brand);
  }

  .logo svg {
    flex-shrink: 0;
    color: var(--brand);
  }

  .main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
  }

  .main-nav a {
    color: var(--text-body);
    font-weight: 500;
    font-size: 15px;
    padding: 8px 2px;
    border-bottom: 2px solid transparent;
    transition: color .2s, border-color .2s;
    border-radius: 2px;
  }

  .main-nav a:hover {
    color: var(--brand);
  }

  .main-nav a.active {
    color: var(--brand);
    border-bottom-color: var(--brand);
  }

  .main-nav a:focus-visible {
    outline: 2px solid var(--brand);
    outline-offset: 4px;
  }

  .header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--brand);
    color: #fff;
    font-weight: 600;
    font-size: 15px;
    padding: 12px 28px;
    border-radius: 999px;
    transition: all .25s ease;
    box-shadow: var(--shadow);
    white-space: nowrap;
  }

  .btn-primary:hover {
    background: var(--brand-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
  }

  .btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow);
  }

  .btn-primary:focus-visible {
    outline: 3px solid rgba(59, 130, 246, 0.3);
    outline-offset: 2px;
  }

  .btn-primary-sm {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: var(--brand);
    color: #fff;
    font-weight: 600;
    font-size: 14px;
    padding: 10px 22px;
    border-radius: 999px;
    transition: all .25s ease;
    box-shadow: var(--shadow);
    white-space: nowrap;
  }

  .btn-primary-sm:hover {
    background: var(--brand-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
  }

  .btn-primary-sm:focus-visible {
    outline: 3px solid rgba(59, 130, 246, 0.3);
    outline-offset: 2px;
  }

  .btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #fff;
    color: var(--brand);
    border: 1.5px solid var(--brand);
    font-weight: 600;
    font-size: 15px;
    padding: 12px 28px;
    border-radius: 999px;
    transition: all .25s ease;
    white-space: nowrap;
  }

  .btn-outline:hover {
    background: var(--brand-light);
    border-color: var(--brand-dark);
    color: var(--brand-dark);
    transform: translateY(-2px);
  }

  .btn-outline:active {
    transform: translateY(0);
  }

  .btn-outline:focus-visible {
    outline: 3px solid rgba(59, 130, 246, 0.3);
    outline-offset: 2px;
  }

  .btn-outline-sm {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    color: var(--brand);
    border: 1.5px solid var(--brand);
    font-weight: 600;
    font-size: 14px;
    padding: 9px 18px;
    border-radius: 999px;
    transition: all .25s ease;
    white-space: nowrap;
  }

  .btn-outline-sm:hover {
    background: var(--brand-light);
    color: var(--brand-dark);
    border-color: var(--brand-dark);
  }

  .btn-lg {
    padding: 16px 40px;
    font-size: 17px;
  }

  .menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    border-radius: 8px;
    transition: background .2s;
  }

  .menu-toggle:hover {
    background: var(--brand-light);
  }

  .menu-toggle span {
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all .3s ease;
  }

  .menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* ===== Breadcrumb ===== */
  .breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
    flex-wrap: wrap;
  }

  .breadcrumb a {
    color: var(--text-muted);
    transition: color .2s;
  }

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

  .breadcrumb .sep {
    color: var(--border);
    font-size: 13px;
  }

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

  /* ===== Hero ===== */
  .hero {
    background:
      radial-gradient(circle at 15% 20%, rgba(43, 125, 233, 0.08) 0, transparent 40%),
      radial-gradient(circle at 85% 80%, rgba(43, 125, 233, 0.06) 0, transparent 35%),
      linear-gradient(180deg, #F0F7FF 0%, #F6F8FB 100%);
    padding: 72px 0 88px;
    border-bottom: 1px solid var(--border);
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: "";
    position: absolute;
    top: 40px;
    right: 6%;
    width: 190px;
    height: 190px;
    background-image: radial-gradient(rgba(43, 125, 233, 0.18) 2px, transparent 2px);
    background-size: 20px 20px;
    border-radius: 50%;
    opacity: .45;
    pointer-events: none;
    z-index: 0;
  }

  .hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
    align-items: center;
    position: relative;
    z-index: 1;
  }

  .breadcrumb {
    margin-bottom: 20px;
  }

  .hero-content h1 {
    font-size: 44px;
    font-weight: 800;
    line-height: 1.25;
    color: var(--text);
    letter-spacing: -0.02em;
    margin: 16px 0 20px;
  }

  .hero-sub {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 16px;
  }

  .hero-desc {
    font-size: 16px;
    color: var(--text-body);
    max-width: 520px;
    margin-bottom: 32px;
    line-height: 1.8;
  }

  .hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 40px;
  }

  .hero-trust {
    display: flex;
    gap: 28px;
    flex-wrap: wrap;
  }

  .trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-body);
  }

  .trust-item svg {
    color: var(--success);
    flex-shrink: 0;
  }

  .hero-visual {
    position: relative;
  }

  .hero-card {
    aspect-ratio: 4 / 5;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    position: relative;
    background: #fff;
  }

  .hero-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }

  .hero-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    background: rgba(255, 255, 255, 0.92);
    color: var(--brand);
    font-size: 13px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 999px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(4px);
  }

  .hero-float-card {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    padding: 12px 18px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .hero-float-card .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.18);
  }

  .hero-float-card span {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
  }

  /* ===== Section Base ===== */
  .section-pad {
    padding: 88px 0;
  }

  .section-head {
    max-width: 640px;
    margin-bottom: 48px;
  }

  .section-tag {
    display: inline-block;
    background: var(--brand-light);
    color: var(--brand);
    font-size: 13px;
    font-weight: 600;
    padding: 4px 14px;
    border-radius: 999px;
    margin-bottom: 16px;
  }

  .section-head h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
    line-height: 1.3;
    letter-spacing: -0.01em;
  }

  .section-head p {
    font-size: 16px;
    color: var(--text-body);
    line-height: 1.7;
  }

  /* ===== Prep Cards ===== */
  .prep-section {
    background: #fff;
  }

  .prep-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .prep-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow);
    transition: all .3s ease;
  }

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

  .card-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: var(--brand-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--brand);
    margin-bottom: 20px;
  }

  .prep-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
  }

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

  /* ===== Flow Section ===== */
  .flow-section {
    background: #F0F4FA;
    padding: 88px 0;
  }

  .flow-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    counter-reset: flow;
  }

  .flow-card {
    position: relative;
    background: #fff;
    border-radius: var(--radius);
    padding: 32px 24px 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: all .3s ease;
  }

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

  .flow-num {
    font-size: 34px;
    font-weight: 800;
    color: var(--brand);
    opacity: .25;
    line-height: 1;
    margin-bottom: 14px;
    font-family: inherit;
  }

  .flow-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
  }

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

  /* ===== Method Section ===== */
  .method-section {
    background: #fff;
  }

  .method-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .method-card {
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 32px 28px;
    box-shadow: var(--shadow);
    transition: all .3s ease;
    position: relative;
    overflow: hidden;
  }

  .method-card::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--brand);
    opacity: .7;
  }

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

  .method-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--brand);
    background: var(--brand-light);
    border-radius: 999px;
    padding: 3px 12px;
    margin-bottom: 16px;
  }

  .method-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
  }

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

  /* ===== Safety Section ===== */
  .safety-section {
    background: #F0F4FA;
    padding: 88px 0;
  }

  .safety-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
  }

  .safety-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
  }

  .safety-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 16 / 11;
  }

  .safety-content .section-tag {
    margin-bottom: 16px;
  }

  .safety-content h2 {
    font-size: 30px;
    font-weight: 700;
    color: var(--text);
    line-height: 1.3;
    margin-bottom: 12px;
  }

  .safety-content .safety-desc {
    font-size: 15px;
    color: var(--text-body);
    line-height: 1.7;
    margin-bottom: 8px;
  }

  .safety-list {
    margin-top: 24px;
  }

  .safety-list li {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    padding: 14px 0;
    border-bottom: 1px dashed var(--border);
  }

  .safety-list li:last-child {
    border-bottom: none;
  }

  .check-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--success);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 12px;
    margin-top: 3px;
  }

  .safety-list strong {
    display: block;
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
  }

  .safety-list p {
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.6;
  }

  /* ===== FAQ Section ===== */
  .faq-section {
    padding: 88px 0;
    background: #fff;
  }

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

  .faq-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all .3s ease;
    position: relative;
  }

  .faq-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--brand);
    opacity: 0;
    transition: opacity .3s;
  }

  .faq-item.open::before,
  .faq-item:hover::before {
    opacity: 1;
  }

  .faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    transition: color .2s;
    background: transparent;
  }

  .faq-question:hover {
    color: var(--brand);
  }

  .faq-icon {
    font-size: 16px;
    color: var(--brand);
    transition: transform .3s;
    flex-shrink: 0;
    line-height: 1;
  }

  .faq-item.open .faq-icon {
    transform: rotate(45deg);
  }

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease;
    padding: 0 24px;
    color: var(--text-body);
    font-size: 15px;
    line-height: 1.7;
  }

  .faq-item.open .faq-answer {
    max-height: 300px;
    padding-bottom: 20px;
  }

  /* ===== CTA Section ===== */
  .cta-section {
    padding: 88px 0;
    background: rgba(43, 125, 233, 0.08);
    position: relative;
    overflow: hidden;
  }

  .cta-section::before {
    content: "";
    position: absolute;
    bottom: -60px;
    left: -40px;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 24px solid rgba(43, 125, 233, 0.08);
    pointer-events: none;
  }

  .cta-section::after {
    content: "";
    position: absolute;
    top: -50px;
    right: 8%;
    width: 140px;
    height: 140px;
    background-image: radial-gradient(rgba(43, 125, 233, 0.2) 2px, transparent 2px);
    background-size: 18px 18px;
    pointer-events: none;
    opacity: .5;
  }

  .cta-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    z-index: 1;
  }

  .cta-inner h2 {
    font-size: 34px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 12px;
    letter-spacing: -0.01em;
    line-height: 1.3;
  }

  .cta-inner p {
    font-size: 16px;
    color: var(--text-body);
    margin-bottom: 32px;
  }

  .cta-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 28px;
  }

  .cta-breadcrumb {
    justify-content: center;
  }

  /* ===== Footer ===== */
  .site-footer {
    background: #0F172A;
    color: #94A3B8;
    padding: 64px 0 24px;
  }

  .footer-links {
    margin-bottom: 40px;
  }

  .footer-title {
    color: #E2E8F0;
    font-weight: 600;
    font-size: 15px;
    margin-bottom: 16px;
  }

  .site-footer a {
    color: #94A3B8;
    transition: color .2s;
  }

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

  .footer-bottom {
    border-top: 1px solid rgba(148, 163, 184, 0.15);
    margin-top: 40px;
    padding-top: 24px;
    font-size: 13px;
    color: #64748B;
  }

  /* ===== Responsive ===== */
  @media (max-width: 1023px) {
    .menu-toggle {
      display: flex;
    }

    .main-nav {
      position: fixed;
      top: 72px;
      left: 0;
      right: 0;
      background: #fff;
      flex-direction: column;
      align-items: flex-start;
      gap: 0;
      padding: 16px 24px 24px;
      border-bottom: 1px solid var(--border);
      box-shadow: var(--shadow-lg);
      transform: translateY(-120%);
      opacity: 0;
      visibility: hidden;
      transition: all .3s ease;
      z-index: 99;
    }

    .main-nav.open {
      transform: translateY(0);
      opacity: 1;
      visibility: visible;
    }

    .main-nav a {
      width: 100%;
      padding: 14px 0;
      border-bottom: 1px solid var(--border);
      font-size: 16px;
    }

    .main-nav a.active {
      border-bottom-color: var(--brand);
    }

    .header-actions .btn-outline-sm {
      display: none;
    }

    .hero-grid {
      grid-template-columns: 1fr 0.8fr;
      gap: 40px;
    }

    .hero-content h1 {
      font-size: 36px;
    }

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

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

    .method-grid {
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }

    .method-card {
      padding: 26px 20px;
    }

    .safety-grid {
      gap: 40px;
    }
  }

  @media (max-width: 767px) {
    .container {
      padding: 0 18px;
    }

    .site-header .header-inner {
      height: 64px;
    }

    .main-nav {
      top: 64px;
    }

    .logo {
      font-size: 17px;
    }

    .header-actions .btn-primary-sm {
      padding: 8px 16px;
      font-size: 13px;
    }

    .hero {
      padding: 48px 0 64px;
    }

    .hero-grid {
      grid-template-columns: 1fr;
      gap: 40px;
    }

    .hero-content h1 {
      font-size: 30px;
    }

    .hero-sub {
      font-size: 16px;
    }

    .hero-trust {
      flex-direction: column;
      gap: 12px;
    }

    .hero-visual {
      max-width: 340px;
      margin: 0 auto;
      width: 100%;
    }

    .hero-card {
      aspect-ratio: 4 / 5;
    }

    .section-pad {
      padding: 56px 0;
    }

    .flow-section,
    .safety-section {
      padding: 56px 0;
    }

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

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

    .safety-content h2 {
      font-size: 26px;
    }

    .prep-grid,
    .flow-grid,
    .method-grid {
      grid-template-columns: 1fr;
      gap: 16px;
    }

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

    .faq-grid {
      grid-template-columns: 1fr;
      gap: 14px;
    }

    .faq-section,
    .faq-section {
      padding: 56px 0;
    }

    .cta-section {
      padding: 56px 0;
    }

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

    .cta-buttons {
      flex-direction: column;
      align-items: center;
    }

    .cta-buttons .btn-primary,
    .cta-buttons .btn-outline {
      width: 100%;
      max-width: 280px;
    }

    .site-footer {
      padding: 48px 0 20px;
    }

    .footer-links {
      gap: 32px !important;
    }
  }

  @media (max-width: 480px) {
    .hero-content h1 {
      font-size: 27px;
    }

    .hero-buttons {
      flex-direction: column;
      align-items: stretch;
    }

    .hero-buttons .btn-primary,
    .hero-buttons .btn-outline {
      text-align: center;
      justify-content: center;
    }
  }

/* roulang page: article */
:root {
            --primary: #2B7DE9;
            --primary-dark: #1E6DD9;
            --primary-light: #E8F0FE;
            --accent: #F59E0B;
            --safe: #10B981;
            --bg: #F6F8FB;
            --card: #FFFFFF;
            --section-blue: #F0F4FA;
            --text: #1E293B;
            --text-body: #475569;
            --text-muted: #94A3B8;
            --border: #E2E8F0;
            --radius: 12px;
            --radius-sm: 8px;
            --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 4px 12px rgba(15, 23, 42, 0.04);
            --shadow-hover: 0 4px 8px rgba(15, 23, 42, 0.08), 0 12px 24px rgba(15, 23, 42, 0.06);
            --container: 1200px;
            --font: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

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

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

        a {
            text-decoration: none;
            color: inherit;
        }

        button {
            font-family: inherit;
        }

        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        @media (max-width: 640px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            height: 72px;
        }

        .logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
            transition: opacity 0.2s;
        }

        .logo:hover {
            opacity: 0.85;
        }

        .logo-icon {
            width: 26px;
            height: 26px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            border-radius: 8px;
            color: var(--primary);
        }

        .logo-text {
            font-weight: 800;
            font-size: 18px;
            color: var(--text);
            white-space: nowrap;
            letter-spacing: -0.01em;
        }

        .nav-container {
            display: flex;
            align-items: center;
            gap: 20px;
            flex: 1;
            justify-content: center;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .main-nav a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            padding: 8px 2px;
            border-bottom: 2px solid transparent;
            transition: color 0.2s, border-color 0.2s;
            line-height: 1.4;
        }

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

        .main-nav a.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
            font-weight: 600;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            border-radius: 9999px;
            transition: all 0.25s ease;
            cursor: pointer;
            border: 1.5px solid transparent;
            text-decoration: none;
            line-height: 1.4;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            padding: 12px 28px;
            font-size: 15px;
            box-shadow: 0 2px 8px rgba(43, 125, 233, 0.25);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow);
        }

        .btn-primary:focus-visible {
            outline: 3px solid rgba(43, 125, 233, 0.3);
            outline-offset: 2px;
        }

        .btn-secondary {
            background: #fff;
            color: var(--primary);
            border-color: var(--primary);
            padding: 12px 24px;
            font-size: 15px;
        }

        .btn-secondary:hover {
            background: var(--primary-light);
            border-color: var(--primary-dark);
            color: var(--primary-dark);
        }

        .btn-secondary:focus-visible {
            outline: 3px solid rgba(43, 125, 233, 0.3);
            outline-offset: 2px;
        }

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

        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: background 0.2s;
        }

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

        .mobile-menu-btn:focus-visible {
            outline: 3px solid rgba(43, 125, 233, 0.3);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-wrap {
            padding-top: 28px;
        }

        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
        }

        .breadcrumb a {
            color: var(--text-muted);
            transition: color 0.2s;
        }

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

        .bc-sep {
            color: #CBD5E1;
            font-size: 13px;
        }

        .bc-current {
            color: var(--text-body);
            max-width: 320px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        /* ===== Post ===== */
        .post-container {
            max-width: 760px;
            margin: 0 auto;
            padding: 36px 0 56px;
        }

        .post-header {
            margin-bottom: 36px;
            padding-bottom: 28px;
            border-bottom: 1px solid var(--border);
        }

        .post-header h1 {
            font-size: 34px;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--text);
            line-height: 1.35;
            margin-bottom: 18px;
        }

        .post-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 14px 24px;
            font-size: 14px;
            color: var(--text-muted);
        }

        .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .meta-item svg {
            width: 16px;
            height: 16px;
            color: var(--text-muted);
            opacity: 0.8;
        }

        .post-cat-pill {
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 9999px;
            font-weight: 500;
            font-size: 13px;
            transition: background 0.2s, color 0.2s;
        }

        a.post-cat-pill:hover {
            background: var(--primary);
            color: #fff;
        }

        /* ===== Post Content ===== */
        .post-content {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-body);
        }

        .post-content p {
            margin-bottom: 1.5em;
        }

        .post-content h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text);
            margin: 2em 0 0.8em;
            padding-top: 0.4em;
            line-height: 1.4;
        }

        .post-content h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--text);
            margin: 1.8em 0 0.6em;
            line-height: 1.5;
        }

        .post-content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--section-blue);
            padding: 18px 22px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 1.5em 0;
            color: var(--text);
            font-weight: 400;
        }

        .post-content img {
            border-radius: var(--radius);
            border: 1px solid var(--border);
            margin: 1.6em 0;
            box-shadow: var(--shadow);
        }

        .post-content figure {
            margin: 1.6em 0;
        }

        .post-content figcaption {
            text-align: center;
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 8px;
        }

        .post-content ul,
        .post-content ol {
            margin: 1.2em 0;
            padding-left: 1.5em;
        }

        .post-content ul {
            list-style: disc;
        }

        .post-content ol {
            list-style: decimal;
        }

        .post-content li {
            margin-bottom: 0.5em;
        }

        .post-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
            transition: color 0.2s;
        }

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

        .post-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5em 0;
            font-size: 15px;
        }

        .post-content th,
        .post-content td {
            border: 1px solid var(--border);
            padding: 10px 14px;
            text-align: left;
        }

        .post-content th {
            background: var(--section-blue);
            font-weight: 600;
            color: var(--text);
        }

        /* ===== Post Nav ===== */
        .post-nav {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin: 44px 0 0;
            padding-top: 28px;
            border-top: 1px solid var(--border);
        }

        .post-nav a {
            display: block;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 16px 20px;
            transition: all 0.25s ease;
        }

        .post-nav a:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }

        .nav-prev {
            text-align: left;
        }

        .nav-next {
            text-align: right;
        }

        .nav-label {
            display: block;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 6px;
            font-weight: 500;
        }

        .nav-title {
            display: block;
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            line-height: 1.5;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .back-list-wrap {
            text-align: center;
            margin-top: 28px;
        }

        /* ===== Related ===== */
        .related-section {
            background: var(--bg);
            border-top: 1px solid var(--border);
            padding: 72px 0;
        }

        .section-title {
            font-size: 26px;
            font-weight: 700;
            color: var(--text);
            letter-spacing: -0.01em;
        }

        .more-link {
            font-size: 14px;
            font-weight: 500;
            color: var(--primary);
            transition: color 0.2s, transform 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

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

        .related-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            display: block;
            transition: all 0.3s ease;
        }

        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: #CBD5E1;
        }

        .related-thumb {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
        }

        .related-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .related-card:hover .related-thumb img {
            transform: scale(1.04);
        }

        .related-badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(255, 255, 255, 0.92);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 9999px;
            backdrop-filter: blur(4px);
        }

        .related-body {
            padding: 18px 20px 20px;
        }

        .related-body h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            line-height: 1.5;
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-time {
            font-size: 13px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 5px;
        }

        /* ===== Not Found ===== */
        .not-found-section {
            min-height: 60vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 100px 20px;
        }

        .not-found-icon {
            width: 72px;
            height: 72px;
            background: var(--primary-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: var(--primary);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0F172A;
            padding: 64px 0 32px;
            color: #94A3B8;
        }

        .site-footer a {
            color: #94A3B8;
            transition: color 0.2s;
        }

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

        .footer-title {
            color: #E2E8F0;
            font-weight: 600;
            font-size: 15px;
            margin-bottom: 16px;
        }

        .footer-links li {
            margin-bottom: 8px;
        }

        .footer-bottom {
            margin-top: 40px;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 13px;
            color: #64748B;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1023px) {
            .main-nav {
                gap: 20px;
            }

            .header-actions .btn-secondary {
                display: none;
            }
        }

        @media (max-width: 768px) {
            .mobile-menu-btn {
                display: flex;
                align-items: center;
                justify-content: center;
                order: 3;
            }

            .nav-container {
                position: absolute;
                top: 72px;
                left: 0;
                right: 0;
                background: #fff;
                border-bottom: 1px solid var(--border);
                flex-direction: column;
                align-items: flex-start;
                padding: 20px 24px 24px;
                gap: 18px;
                display: none;
                box-shadow: 0 16px 32px rgba(15, 23, 42, 0.08);
            }

            .nav-container.nav-open {
                display: flex;
            }

            .main-nav {
                flex-direction: column;
                align-items: flex-start;
                gap: 0;
                width: 100%;
            }

            .main-nav a {
                display: block;
                width: 100%;
                padding: 12px 0;
                border-bottom: 1px solid var(--border);
                font-size: 16px;
            }

            .main-nav a.active {
                border-bottom-color: var(--primary);
            }

            .header-actions {
                width: 100%;
                justify-content: flex-start;
                padding-top: 4px;
            }

            .header-actions .btn-primary {
                width: 100%;
            }

            .logo-text {
                font-size: 16px;
            }

            .breadcrumb-wrap {
                padding-top: 20px;
            }

            .post-container {
                padding: 24px 0 40px;
            }

            .post-header h1 {
                font-size: 26px;
            }

            .post-meta {
                gap: 10px 16px;
            }

            .post-nav {
                grid-template-columns: 1fr;
            }

            .related-section {
                padding: 56px 0;
            }

            .section-title {
                font-size: 22px;
            }

            .site-footer {
                padding: 48px 0 24px;
            }

            .footer-links {
                gap: 32px;
            }
        }

        @media (max-width: 480px) {
            .header-inner {
                height: 64px;
            }

            .nav-container {
                top: 64px;
            }

            .logo-icon {
                width: 24px;
                height: 24px;
            }

            .logo-text {
                font-size: 15px;
            }

            .post-header h1 {
                font-size: 23px;
            }

            .post-content {
                font-size: 15px;
            }

            .post-content h2 {
                font-size: 21px;
            }

            .post-content h3 {
                font-size: 18px;
            }

            .related-body h3 {
                font-size: 15px;
            }

            .btn-sm {
                padding: 9px 18px;
                font-size: 14px;
            }

            .bc-current {
                max-width: 180px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #2B7DE9;
            --primary-dark: #1E63C4;
            --primary-light: #E8F1FD;
            --accent: #F59E0B;
            --success: #10B981;
            --bg: #F6F8FB;
            --card: #FFFFFF;
            --section-blue: #F0F4FA;
            --text-dark: #1E293B;
            --text-body: #475569;
            --text-muted: #94A3B8;
            --border: #E2E8F0;
            --radius: 12px;
            --radius-lg: 16px;
            --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 4px 12px rgba(15, 23, 42, 0.04);
            --shadow-hover: 0 4px 8px rgba(15, 23, 42, 0.08), 0 12px 24px rgba(15, 23, 42, 0.06);
            --container: 1200px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg);
            color: var(--text-body);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color .2s ease;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 按钮 */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            padding: 12px 28px;
            border-radius: 999px;
            border: none;
            cursor: pointer;
            transition: all .25s ease;
            box-shadow: 0 2px 6px rgba(43, 125, 233, 0.25);
            line-height: 1.4;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }
        .btn-primary:focus-visible {
            outline: 3px solid rgba(59, 130, 246, 0.35);
            outline-offset: 2px;
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: var(--shadow);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            font-size: 15px;
            padding: 12px 28px;
            border-radius: 999px;
            border: 1px solid #BFDBFE;
            cursor: pointer;
            transition: all .25s ease;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            background: var(--primary-light);
        }
        .btn-secondary:focus-visible {
            outline: 3px solid rgba(59, 130, 246, 0.3);
            outline-offset: 2px;
        }
        .btn-lg {
            padding: 16px 42px;
            font-size: 17px;
        }
        .btn-sm {
            padding: 9px 22px;
            font-size: 14px;
        }

        /* 导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.96);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 1px 6px rgba(15, 23, 42, 0.04);
            backdrop-filter: blur(8px);
        }
        .header-inner {
            display: flex;
            align-items: center;
            gap: 12px;
            min-height: 72px;
        }
        .brand-logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            margin-right: auto;
            font-weight: 800;
            font-size: 17px;
            color: var(--text-dark);
            letter-spacing: -0.01em;
        }
        .brand-logo .logo-icon {
            width: 34px;
            height: 34px;
            flex-shrink: 0;
            background: var(--primary-light);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 6px;
        }
        .brand-logo .logo-icon svg {
            width: 100%;
            height: 100%;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .main-nav a {
            font-size: 15px;
            font-weight: 500;
            color: #334155;
            padding: 8px 16px;
            border-radius: 999px;
            transition: all .2s ease;
        }
        .main-nav a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .main-nav a.active {
            color: var(--primary);
            font-weight: 600;
            background: rgba(43, 125, 233, 0.08);
        }
        .header-cta {
            margin-left: 10px;
        }
        .nav-toggle {
            display: none;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            color: var(--text-dark);
            align-items: center;
            justify-content: center;
            transition: background .2s ease;
        }
        .nav-toggle:hover {
            background: var(--primary-light);
        }
        .nav-toggle:focus-visible {
            outline: 3px solid rgba(59, 130, 246, 0.3);
        }

        /* Hero */
        .hero {
            background: linear-gradient(180deg, #EDF3FD 0%, #F8FAFE 55%, #FFFFFF 100%);
            padding: 80px 0 72px;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: "";
            position: absolute;
            top: 40px;
            right: -80px;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            background: rgba(43, 125, 233, 0.06);
            pointer-events: none;
        }
        .hero::after {
            content: "";
            position: absolute;
            bottom: 20px;
            left: -60px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(43, 125, 233, 0.04);
            pointer-events: none;
        }
        .hero-inner {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 56px;
            align-items: center;
            position: relative;
            z-index: 2;
        }
        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(43, 125, 233, 0.08);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 999px;
            margin-bottom: 20px;
        }
        .hero h1 {
            font-size: 42px;
            line-height: 1.2;
            font-weight: 800;
            color: var(--text-dark);
            letter-spacing: -0.02em;
            margin-bottom: 16px;
        }
        .hero-sub {
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-body);
            max-width: 480px;
            margin-bottom: 28px;
        }
        .hero-btns {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 32px;
        }
        .hero-trust {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            font-size: 13px;
            color: #64748B;
        }
        .hero-trust span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .hero-trust span::before {
            content: "";
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--success);
        }
        .hero-visual {
            position: relative;
        }
        .hero-img {
            width: 100%;
            aspect-ratio: 4/5;
            object-fit: cover;
            border-radius: 20px;
            border: 4px solid rgba(255, 255, 255, 0.9);
            box-shadow: var(--shadow-hover);
        }
        .hero-badge {
            position: absolute;
            top: 18px;
            right: 18px;
            background: var(--accent);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 999px;
            box-shadow: 0 2px 8px rgba(245, 158, 11, 0.35);
        }
        .hero-dots {
            position: absolute;
            bottom: -14px;
            left: -14px;
            width: 70px;
            height: 70px;
            background-image: radial-gradient(rgba(43, 125, 233, 0.18) 2px, transparent 2px);
            background-size: 14px 14px;
            border-radius: 12px;
            pointer-events: none;
        }

        /* 面包屑 */
        .breadcrumb {
            font-size: 13px;
            color: var(--text-muted);
            padding: 14px 0 0;
        }
        .breadcrumb a {
            color: var(--text-muted);
            transition: color .2s ease;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            margin: 0 6px;
            color: #CBD5E1;
        }
        .breadcrumb .current {
            color: var(--text-body);
            font-weight: 500;
        }

        /* 通用section */
        .section {
            padding: 80px 0;
        }
        .section-white {
            background: #fff;
        }
        .section-blue {
            background: var(--section-blue);
        }
        .section-head {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-head h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-dark);
            letter-spacing: -0.01em;
            margin-bottom: 10px;
        }
        .section-head p {
            font-size: 15px;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto;
        }

        /* 亮点卡片 */
        .highlight-card {
            background: var(--card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 28px 24px;
            box-shadow: var(--shadow);
            transition: all .3s ease;
            height: 100%;
        }
        .highlight-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: #BFDBFE;
        }
        .highlight-card .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
            color: var(--primary);
        }
        .highlight-card .card-icon svg {
            width: 24px;
            height: 24px;
            stroke-width: 2;
        }
        .highlight-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .highlight-card p {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.7;
        }

        /* 功能详解 */
        .feature-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
            margin-bottom: 56px;
        }
        .feature-row:last-child {
            margin-bottom: 0;
        }
        .feature-row-reverse .feature-img {
            order: 2;
        }
        .feature-row-reverse .feature-text {
            order: 1;
        }
        .feature-text {
            max-width: 480px;
        }
        .feature-text .feature-num {
            font-size: 13px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 0.08em;
            text-transform: uppercase;
            margin-bottom: 8px;
            display: block;
        }
        .feature-text h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 14px;
            line-height: 1.4;
        }
        .feature-text p {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.8;
        }
        .feature-img {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
            background: #fff;
            border: 1px solid var(--border);
        }
        .feature-img img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            transition: transform .5s ease;
        }
        .feature-img:hover img {
            transform: scale(1.02);
        }
        .feature-img .feature-img-caption {
            padding: 12px 16px;
            font-size: 13px;
            color: var(--text-muted);
            border-top: 1px solid var(--border);
            background: #FAFBFD;
        }

        /* 场景卡片 */
        .scenario-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 26px 22px;
            transition: all .3s ease;
            position: relative;
            height: 100%;
            box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
        }
        .scenario-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: #BFDBFE;
        }
        .scenario-icon {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .scenario-icon svg {
            width: 22px;
            height: 22px;
            stroke-width: 2;
        }
        .scenario-card h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .scenario-card p {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.7;
        }

        /* 数据指标 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: #fff;
            border-radius: var(--radius);
            padding: 32px 20px;
            text-align: center;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: all .3s ease;
        }
        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .stat-num {
            font-size: 34px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            display: block;
            margin-bottom: 6px;
            letter-spacing: -0.02em;
        }
        .stat-label {
            font-size: 14px;
            color: var(--text-body);
        }

        /* FAQ */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .faq-item {
            background: #fff;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 22px 24px;
            padding-left: 20px;
            border-left: 4px solid var(--primary);
            box-shadow: var(--shadow);
            transition: box-shadow .3s ease;
            cursor: pointer;
        }
        .faq-item:hover {
            box-shadow: var(--shadow-hover);
        }
        .faq-question {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            user-select: none;
        }
        .faq-question .faq-icon {
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            color: var(--text-muted);
            transition: transform .3s ease;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.7;
            border-top: 0 solid transparent;
        }
        .faq-item.active .faq-answer {
            max-height: 320px;
            padding-top: 12px;
            margin-top: 12px;
            border-top: 1px solid var(--border);
        }

        /* CTA */
        .cta-section {
            background: rgba(43, 125, 233, 0.08);
            position: relative;
            overflow: hidden;
            padding: 80px 0;
        }
        .cta-section::before {
            content: "";
            position: absolute;
            top: -40px;
            right: -40px;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            border: 24px solid rgba(43, 125, 233, 0.06);
            pointer-events: none;
        }
        .cta-inner {
            text-align: center;
            position: relative;
            z-index: 2;
            max-width: 640px;
            margin: 0 auto;
        }
        .cta-inner h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--text-dark);
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .cta-inner p {
            font-size: 15px;
            color: var(--text-body);
            margin-bottom: 28px;
        }

        /* 页脚 */
        .site-footer {
            background: #0F172A;
            color: #94A3B8;
            padding: 56px 0 28px;
        }
        .footer-links {
            margin-bottom: 40px;
        }
        .footer-title {
            color: #E2E8F0;
            font-weight: 600;
            font-size: 15px;
            margin-bottom: 16px;
        }
        .footer-links li a {
            color: #94A3B8;
            transition: color .2s ease;
        }
        .footer-links li a:hover {
            color: #60A5FA;
        }
        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 22px;
            font-size: 13px;
            color: #64748B;
        }

        /* 响应式 */
        @media (max-width: 1023px) {
            .header-inner {
                flex-wrap: wrap;
                min-height: 64px;
            }
            .brand-logo {
                margin-right: auto;
            }
            .nav-toggle {
                display: inline-flex;
            }
            .main-nav {
                order: 5;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                padding: 8px 0 12px;
                display: none;
                gap: 2px;
                background: #fff;
                border-top: 1px solid var(--border);
                border-radius: 0 0 var(--radius) var(--radius);
                box-shadow: 0 12px 20px rgba(15, 23, 42, 0.05);
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 10px 12px;
                width: 100%;
                border-radius: 10px;
            }
            .header-cta {
                margin-left: 4px;
            }
            .hero {
                padding: 56px 0 48px;
            }
            .hero-inner {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .hero h1 {
                font-size: 32px;
            }
            .hero-sub {
                font-size: 15px;
            }
            .hero-visual {
                max-width: 420px;
                margin: 0 auto;
                width: 100%;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
            .feature-row {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .feature-row-reverse .feature-img {
                order: 1;
            }
            .feature-row-reverse .feature-text {
                order: 2;
            }
            .feature-text {
                max-width: 100%;
            }
        }
        @media (max-width: 767px) {
            .container {
                padding: 0 18px;
            }
            .section {
                padding: 56px 0;
            }
            .section-head {
                margin-bottom: 32px;
            }
            .section-head h2 {
                font-size: 24px;
            }
            .brand-logo {
                font-size: 15px;
                gap: 8px;
            }
            .brand-logo .logo-icon {
                width: 30px;
                height: 30px;
            }
            .header-cta .btn-sm {
                padding: 7px 16px;
                font-size: 13px;
            }
            .hero {
                padding: 40px 0 32px;
            }
            .hero h1 {
                font-size: 27px;
            }
            .hero-sub {
                font-size: 14px;
                margin-bottom: 22px;
            }
            .hero-btns {
                gap: 10px;
            }
            .hero-btns .btn-primary,
            .hero-btns .btn-secondary {
                padding: 10px 22px;
                font-size: 14px;
            }
            .hero-trust {
                gap: 12px;
                font-size: 12px;
            }
            .hero-img {
                border-radius: 14px;
            }
            .hero-badge {
                font-size: 12px;
                padding: 5px 12px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .stat-card {
                padding: 20px 12px;
            }
            .stat-num {
                font-size: 26px;
            }
            .cta-section {
                padding: 56px 0;
            }
            .cta-inner h2 {
                font-size: 24px;
            }
            .faq-item {
                padding: 18px 16px;
            }
            .faq-question {
                font-size: 15px;
            }
            .footer-links {
                gap: 24px !important;
            }
        }
        @media (max-width: 520px) {
            .hero-btns {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-btns .btn-primary,
            .hero-btns .btn-secondary {
                justify-content: center;
            }
            .hero-trust {
                justify-content: space-between;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .feature-text h3 {
                font-size: 19px;
            }
            .section-head h2 {
                font-size: 22px;
            }
        }