.deepdoc-masthead {
  position: relative;
  padding-top: clamp(72px, 10vw, 124px);
  padding-bottom: clamp(54px, 8vw, 96px);
  overflow-x: clip;
  text-align: center;
}

.deepdoc-masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(to bottom, transparent, currentColor, transparent);
}

.deepdoc-masthead::after {
  content: "";
  position: absolute;
  top: 20%;
  left: 50%;
  width: min(78vw, 860px);
  height: 68%;
  pointer-events: none;
  border-radius: var(--radius-pill);
  background: radial-gradient(circle, var(--color-accent-pale), transparent 68%);
  transform: translateX(-50%);
  opacity: 0.72;
}

.deepdoc-masthead .reading-wrap {
  position: relative;
  z-index: 1;
}

.deepdoc-masthead .kicker {
  margin-inline: auto;
}

.deepdoc-masthead h1 {
  max-width: 760px;
  margin-inline: auto;
}

.deepdoc-lead {
  max-width: 720px;
  margin: 0 auto;
  color: var(--color-text-muted);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.75;
}

.deepdoc-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 9px;
  margin-top: 28px;
}

.doc-intro h2 {
  font-size: clamp(27px, 3vw, 36px);
}

.doc-intro p:last-child {
  margin-bottom: 0;
}

.doc-intro a,
.reference-links a {
  color: var(--color-accent-dark);
  font-weight: 700;
}

.deepdoc-toc-host {
  position: relative;
  z-index: 20;
}

.deepdoc-toc-host .toc-tabs {
  margin-top: 0;
  margin-bottom: 0;
}

.deepdoc-article {
  padding-top: 22px;
  padding-bottom: clamp(34px, 5vw, 64px);
}

.guide-section {
  position: relative;
  padding-top: clamp(72px, 9vw, 108px);
  padding-bottom: clamp(42px, 6vw, 72px);
  overflow-x: clip;
}

.guide-section:nth-child(even) {
  background: linear-gradient(90deg, transparent, var(--color-accent-faint), transparent);
}

.guide-section .eyebrow {
  margin-bottom: 18px;
}

.guide-section .prose h2 {
  margin-top: 0;
}

.guide-section .prose h3 {
  padding-top: 4px;
}

.guide-section .table-shell {
  margin: 32px 0;
}

.guide-section pre {
  margin: 28px 0;
}

.diagnostic-flow {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 32px 0;
}

.diagnostic-flow article {
  min-width: 0;
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-paper);
}

.diagnostic-flow h3 {
  margin: 7px 0 9px;
  font-size: 20px;
}

.diagnostic-flow p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.7;
}

.diagnostic-label {
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 720;
  letter-spacing: 0.04em;
}

.reference-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.55fr);
  align-items: center;
  gap: clamp(28px, 5vw, 64px);
  padding: clamp(26px, 5vw, 48px);
  border-radius: var(--radius-xl);
}

.reference-links h2 {
  margin-bottom: 12px;
  font-size: clamp(30px, 4vw, 42px);
}

.reference-links p {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.reference-link-list {
  display: grid;
  gap: 10px;
}

.reference-link-list a {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  box-shadow: var(--shadow-paper);
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.reference-link-list a:hover {
  transform: translateX(3px);
  box-shadow: var(--shadow-stage);
}

.reference-link-list span {
  flex: 0 0 auto;
  font-family: var(--font-mono);
}

@media (max-width: 768px) {
  .deepdoc-masthead {
    padding-top: 64px;
    padding-bottom: 58px;
  }

  .deepdoc-masthead::after {
    width: 100%;
  }

  .deepdoc-toc-host {
    padding-inline: var(--gutter);
  }

  .diagnostic-flow,
  .reference-links {
    grid-template-columns: 1fr;
  }

  .guide-section {
    padding-top: 72px;
    padding-bottom: 48px;
  }
}

@media (max-width: 640px) {
  .deepdoc-meta {
    align-items: stretch;
  }

  .deepdoc-meta .fact-chip {
    white-space: normal;
  }

  .diagnostic-flow {
    grid-template-columns: 1fr;
  }

  .reference-link-list a {
    width: 100%;
  }
}