.deepdoc-intro {
  padding-top: clamp(56px, 8vw, 104px);
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.deepdoc-heading {
  max-width: 900px;
}

.deepdoc-heading h1 {
  max-width: 860px;
}

.deepdoc-route {
  display: flex;
  max-width: 100%;
  margin-top: 36px;
  padding: 14px 16px;
  overflow-x: auto;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--color-accent-line);
  border-radius: var(--radius-m);
  background: var(--color-accent-wash);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: .78rem;
  scrollbar-width: thin;
}

.deepdoc-route span {
  min-width: max-content;
}

.deepdoc-route span[aria-hidden="true"] {
  color: var(--color-accent);
}

.deepdoc-preface {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr);
  margin-top: 40px;
  align-items: start;
  gap: clamp(24px, 5vw, 56px);
}

.deepdoc-preface > p {
  color: var(--color-muted);
  font-size: 1.05rem;
  line-height: 1.85;
}

.deepdoc-preface a,
.manual-chapter a {
  color: var(--color-accent);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--color-accent-line);
  text-underline-offset: .18em;
}

.deepdoc-preface .callout {
  margin-block: 0;
}

.deepdoc-intro .toc {
  position: relative;
  top: auto;
  margin-top: 48px;
  margin-bottom: 0;
}

.deepdoc-body {
  background: var(--color-bg);
}

.manual-chapter {
  scroll-margin-top: 20px;
  padding-top: clamp(72px, 9vw, 112px);
  padding-bottom: clamp(72px, 9vw, 112px);
  border-bottom: 1px solid var(--color-border);
}

.manual-chapter--panel {
  background: var(--color-panel);
}

.manual-chapter .prose {
  max-width: calc(var(--wrap-prose) + (var(--gutter) * 2));
}

.chapter-index {
  margin-bottom: 12px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .1em;
}

.manual-chapter h2 {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.manual-chapter h3 {
  margin-top: 42px;
}

.manual-chapter p {
  color: var(--color-muted);
}

.manual-chapter h2 + h3 {
  margin-top: 34px;
}

.manual-chapter pre {
  margin-top: 24px;
  margin-bottom: 24px;
}

.manual-chapter .data-table {
  margin-top: 30px;
  margin-bottom: 30px;
}

.manual-chapter .data-table th:first-child {
  min-width: 150px;
}

.manual-chapter .callout p {
  color: var(--color-text);
}

.deepdoc-close {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

.deepdoc-close-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(28px, 5vw, 64px);
  border-color: var(--color-accent-line);
  background: var(--color-accent-wash);
}

.deepdoc-close-panel h2 {
  margin-bottom: 12px;
}

.deepdoc-close-panel .button-row {
  justify-content: flex-end;
}

@media (max-width: 820px) {
  .deepdoc-preface,
  .deepdoc-close-panel {
    grid-template-columns: 1fr;
  }

  .deepdoc-close-panel .button-row {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .deepdoc-intro {
    padding-top: 48px;
  }

  .deepdoc-route {
    margin-top: 28px;
  }

  .deepdoc-preface {
    margin-top: 32px;
  }

  .deepdoc-intro .toc {
    margin-top: 36px;
  }

  .manual-chapter {
    padding-top: 68px;
    padding-bottom: 68px;
  }

  .manual-chapter h3 {
    margin-top: 34px;
  }

  .deepdoc-close-panel .button-row {
    width: 100%;
  }
}