:root {
  color-scheme: light dark;
  --seo-bg: #ffffff;
  --seo-surface: #f8fafc;
  --seo-card: #ffffff;
  --seo-text: #0f172a;
  --seo-muted: #475569;
  --seo-border: #e2e8f0;
  --seo-blue: #2563eb;
  --seo-blue-dark: #1d4ed8;
  --seo-blue-soft: #eff6ff;
}

html.dark {
  --seo-bg: #0b1220;
  --seo-surface: #111c2e;
  --seo-card: #111c2e;
  --seo-text: #e6edf7;
  --seo-muted: #b3c1d5;
  --seo-border: #304159;
  --seo-blue: #93c5fd;
  --seo-blue-dark: #bfdbfe;
  --seo-blue-soft: #172f50;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--seo-bg);
  color: var(--seo-text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}
a { color: inherit; }

.seo-header {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 68px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--seo-border);
  background: color-mix(in srgb, var(--seo-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.seo-header-inner,
.seo-container,
.seo-wrap,
.seo-footer > p {
  width: min(1120px, calc(100% - 32px));
  margin-left: auto;
  margin-right: auto;
}

.seo-header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.seo-header > .brand {
  margin-left: max(16px, calc((100% - 1120px) / 2));
  min-height: 68px;
  display: inline-flex;
  align-items: center;
  font-size: 20px;
  font-weight: 850;
  letter-spacing: .04em;
  text-decoration: none;
}

.seo-header > .header-link {
  margin-left: auto;
  margin-right: max(16px, calc((100% - 1120px) / 2));
  font-size: 14px;
  font-weight: 700;
  color: var(--seo-muted);
  text-decoration: none;
}
.seo-header > .header-link:hover { color: var(--seo-blue); }

.seo-logo-light,
.seo-logo-dark { height: 38px; width: auto; display: block; }
.seo-logo-dark { display: none; }
html.dark .seo-logo-light { display: none; }
html.dark .seo-logo-dark { display: block; }

.seo-header-nav { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.seo-header-nav a { font-size: 14px; font-weight: 650; text-decoration: none; color: var(--seo-muted); }
.seo-header-nav a:hover { color: var(--seo-blue); }

.seo-hero {
  border-bottom: 1px solid var(--seo-border);
  background: linear-gradient(180deg, var(--seo-blue-soft), var(--seo-bg));
  padding: 64px 0 56px;
}

.seo-eyebrow,
.eyebrow {
  margin: 0 0 12px;
  color: var(--seo-blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(38px, 6vw, 64px);
  line-height: 1.06;
  letter-spacing: -.04em;
}

.seo-lead,
.lead {
  max-width: 800px;
  margin: 22px 0 0;
  color: var(--seo-muted);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.75;
}

.seo-actions,
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.seo-button,
.actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 11px 18px;
  border: 1px solid var(--seo-border);
  border-radius: 12px;
  background: var(--seo-card);
  color: var(--seo-text);
  font-weight: 750;
  text-decoration: none;
  transition: transform .16s ease, border-color .16s ease, background .16s ease;
}
.seo-button:hover,
.actions a:hover { transform: translateY(-1px); border-color: var(--seo-blue); }
.seo-button-primary,
.actions .primary { border-color: #2563eb; background: #2563eb; color: #fff; }
.seo-button-primary:hover,
.actions .primary:hover { background: #1d4ed8; }

.seo-highlights,
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  padding: 36px 0 10px;
}

.seo-highlight,
.stat,
.seo-list li,
.feature-list li,
.cards article,
.seo-faq details,
.content details,
.seo-related,
.related {
  border: 1px solid var(--seo-border);
  border-radius: 16px;
  background: var(--seo-surface);
}

.seo-highlight,
.stat { padding: 18px; }
.seo-highlight span,
.stat span { display: block; color: var(--seo-muted); font-size: 13px; }
.seo-highlight strong,
.stat strong { display: block; margin-top: 3px; font-size: 20px; }

.seo-content,
.content { padding: 38px 0 72px; }
.seo-section { margin-top: 46px; }
.seo-section:first-child { margin-top: 22px; }

h2 {
  margin: 0;
  font-size: clamp(26px, 4vw, 34px);
  line-height: 1.2;
  letter-spacing: -.025em;
}
.content > h2 { margin-top: 46px; }
.content > h2:first-child { margin-top: 22px; }

.seo-section p,
.content > p,
.cards article p,
.content details p {
  max-width: 880px;
  margin: 16px 0 0;
  color: var(--seo-muted);
}

.seo-list,
.feature-list,
.cards {
  list-style: none;
  padding: 0;
  margin: 20px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.seo-list li,
.feature-list li,
.cards article { padding: 16px 18px; color: var(--seo-muted); }
.seo-list strong,
.feature-list strong,
.cards article h3 { color: var(--seo-text); }
.cards article h3 { margin: 0; font-size: 18px; }
.cards article p { margin-top: 8px; }

.seo-faq { margin-top: 52px; }
.seo-faq details,
.content details { margin-top: 12px; padding: 17px 18px; }
.seo-faq summary,
.content details summary { cursor: pointer; font-weight: 750; color: var(--seo-text); }
.seo-faq p,
.content details p { margin: 12px 0 0; color: var(--seo-muted); }

.seo-related,
.related {
  margin-top: 52px;
  padding: 22px;
  background: var(--seo-blue-soft);
}
.seo-related h2 { font-size: 22px; }
.seo-related-links,
.related { display: flex; flex-wrap: wrap; gap: 10px; }
.seo-related-links { margin-top: 14px; }
.seo-related a,
.related a {
  border: 1px solid var(--seo-border);
  border-radius: 999px;
  background: var(--seo-card);
  color: var(--seo-blue-dark);
  padding: 8px 13px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}
.seo-related a:hover,
.related a:hover { border-color: var(--seo-blue); }

.seo-footer {
  border-top: 1px solid var(--seo-border);
  background: var(--seo-surface);
  padding: 30px 0;
  color: var(--seo-muted);
  font-size: 14px;
}
.seo-footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 18px; }
.seo-footer > p { margin-top: 0; margin-bottom: 0; }
.seo-footer a { color: var(--seo-blue-dark); }

@media (max-width: 800px) {
  .seo-header-inner { align-items: flex-start; padding: 14px 0; flex-direction: column; }
  .seo-header-nav { gap: 10px 14px; }
  .seo-header > .brand { margin-left: 16px; }
  .seo-header > .header-link { margin-right: 16px; }
  .seo-hero { padding: 44px 0; }
  .seo-highlights,
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .seo-list,
  .feature-list,
  .cards { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .seo-header-inner,
  .seo-container,
  .seo-wrap,
  .seo-footer > p { width: min(100% - 24px, 1120px); }
  .seo-highlights,
  .stats { grid-template-columns: 1fr 1fr; gap: 8px; }
  .seo-highlight,
  .stat { padding: 14px; }
  .seo-highlight strong,
  .stat strong { font-size: 17px; }
  .actions a { width: 100%; }
}