:root {
  --seo-navy: #102c3d;
  --seo-blue: #2864d7;
  --seo-muted: #5b6e7a;
  --seo-line: #d8e2e9;
  --seo-soft: #f2f7fc;
}

.seo-page {
  color: var(--seo-navy);
  background: #fff;
}

.seo-page .seo-shell {
  width: min(1120px, calc(100% - 44px));
  margin: 0 auto;
}

.seo-page .site-header {
  border-bottom: 1px solid var(--seo-line);
}

.seo-breadcrumbs {
  padding: 22px 0 0;
  color: var(--seo-muted);
  font-size: .86rem;
}

.seo-breadcrumbs a { color: var(--seo-blue); font-weight: 700; }

.seo-hero {
  padding: 58px 0 64px;
}

.seo-eyebrow {
  margin: 0 0 14px;
  color: var(--seo-blue);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.seo-hero h1 {
  max-width: 850px;
  margin: 0;
  color: var(--seo-navy);
  font-size: clamp(2.35rem, 5vw, 4.4rem);
  line-height: 1.03;
  letter-spacing: -.045em;
}

.seo-lead {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--seo-muted);
  font-size: 1.15rem;
  line-height: 1.7;
}

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

.seo-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 7px;
  background: var(--seo-blue);
  color: #fff !important;
  font-weight: 800;
  text-decoration: none;
}

.seo-button.secondary {
  border: 1px solid #bfd0e0;
  background: #fff;
  color: var(--seo-blue) !important;
}

.seo-button:disabled {
  cursor: not-allowed;
  opacity: .62;
}

.seo-pending-note {
  margin: 14px 0 0;
  color: var(--seo-muted);
  font-size: .88rem;
}

.seo-section {
  padding: 66px 0;
  border-top: 1px solid var(--seo-line);
}

.seo-section.soft { background: var(--seo-soft); }

.seo-section h2 {
  margin: 0 0 14px;
  color: var(--seo-navy);
  font-size: clamp(1.85rem, 3.3vw, 2.8rem);
  line-height: 1.1;
  letter-spacing: -.035em;
}

.seo-section h3 {
  margin: 26px 0 8px;
  color: var(--seo-navy);
  font-size: 1.25rem;
}

.seo-section p,
.seo-section li {
  color: var(--seo-muted);
  line-height: 1.7;
}

.seo-section a { color: var(--seo-blue); }

.seo-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 15px;
  margin-top: 28px;
}

.seo-feature-card {
  min-height: 150px;
  padding: 20px;
  border: 1px solid var(--seo-line);
  border-radius: 10px;
  background: #fff;
}

.seo-feature-card strong { display: block; margin-bottom: 7px; color: var(--seo-navy); }
.seo-feature-card p { margin: 0; font-size: .95rem; line-height: 1.55; }

.seo-callout {
  margin-top: 24px;
  padding: 18px 20px;
  border-left: 4px solid var(--seo-blue);
  background: #eef5ff;
  color: #456276;
}

.seo-callout strong { color: var(--seo-navy); }

.seo-example-grid {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 34px;
  align-items: start;
}

.seo-example-grid figure {
  min-width: 0;
  margin: 0;
}

.seo-example-grid img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: contain;
}

.seo-example-grid figcaption {
  margin-top: 10px;
  color: var(--seo-muted);
  font-size: .88rem;
  line-height: 1.5;
}

.seo-summary-preview {
  margin-top: 30px;
}

.seo-summary-preview h3 { margin-top: 0; }

.seo-parameter-table,
.reference-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 22px 0;
}

.seo-parameter-table th,
.seo-parameter-table td,
.reference-body th,
.reference-body td {
  padding: 10px 12px;
  border: 1px solid var(--seo-line);
  text-align: left;
  vertical-align: top;
}

.seo-parameter-table th,
.reference-body th { background: #f5f8fb; color: var(--seo-navy); }

.seo-report-note {
  padding: 20px;
  border: 1px dashed #b9c9d7;
  border-radius: 9px;
  background: #fbfdff;
}

.seo-report-note p { margin: 0; }

.seo-toc {
  padding: 20px 24px;
  border: 1px solid var(--seo-line);
  border-radius: 10px;
  background: var(--seo-soft);
}

.seo-toc h2 { font-size: 1.35rem; }
.seo-toc ol { columns: 2; margin: 0; padding-left: 22px; }
.seo-toc li { break-inside: avoid; margin: 6px 0; }

.reference-body {
  padding: 22px 0 68px;
}

.reference-body > section > h1 {
  display: none;
}

.reference-body h2 {
  scroll-margin-top: 20px;
  margin-top: 42px;
}

.reference-body h3 { margin-top: 26px; }

.reference-body .math {
  overflow-x: auto;
  padding: 8px 0;
  text-align: center;
}

.reference-body .code-ref,
.reference-body .note {
  margin: 18px 0;
  padding: 12px 16px;
  border-left: 4px solid #8fa8bd;
  background: #f6f9fb;
}

.reference-body .warning {
  border-left-color: #b05a5a;
  background: #fff7f7;
}

.seo-footer {
  padding: 24px 0;
  border-top: 1px solid var(--seo-line);
  color: #7590aa;
  font-size: .85rem;
}

.seo-footer a { color: var(--seo-blue); font-weight: 700; }

@media (max-width: 800px) {
  .seo-feature-grid,
  .seo-example-grid { grid-template-columns: 1fr; }
  .seo-toc ol { columns: 1; }
}

@media (max-width: 600px) {
  .seo-page .seo-shell { width: min(100% - 30px, 1120px); }
  .seo-hero { padding: 42px 0 50px; }
  .seo-section { padding: 48px 0; }
  .seo-actions .seo-button { width: 100%; }
}