:root {
  --doc-rule-width: 74px;
  --doc-chapter-gap: clamp(76px, 10vw, 124px);
  --doc-copy-gap: 1.15em;
  --doc-index-size: 12px;
}

.doc-hero {
  position: relative;
  border-bottom: var(--line-hairline) solid var(--color-border);
}

.doc-hero::before {
  position: absolute;
  top: 0;
  right: max(var(--gutter), calc((100vw - var(--page-width)) / 2));
  width: min(34vw, 430px);
  height: 100%;
  border-right: var(--line-hairline) solid var(--color-accent-soft);
  border-left: var(--line-hairline) solid var(--color-accent-soft);
  content: "";
  background:
    repeating-linear-gradient(
      90deg,
      var(--color-transparent) 0,
      var(--color-transparent) 23px,
      var(--color-accent-faint) 24px
    );
  opacity: 0.72;
  pointer-events: none;
}

.doc-hero .content-wrap {
  position: relative;
  z-index: 1;
}

.doc-hero .eyebrow {
  margin-bottom: 24px;
}

.doc-hero h1 {
  max-width: 980px;
  font-size: clamp(54px, 8vw, 112px);
}

.doc-hero .lead {
  max-width: 880px;
}

.doc-hero .callout {
  max-width: 900px;
  margin-bottom: 0;
}

.doc-hero .callout a,
.doc-reading-note a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-dark);
  text-underline-offset: 4px;
}

.doc-stamps {
  display: flex;
  margin-top: 28px;
  gap: 8px;
  flex-wrap: wrap;
}

.doc-index {
  border-bottom: var(--line-hairline) solid var(--color-border);
  background: var(--color-bg-soft);
}

.doc-index .toc-tabs {
  margin-bottom: 24px;
}

.doc-reading-note {
  display: grid;
  padding: 18px 20px;
  border-left: var(--line-strong) solid var(--color-accent-dark);
  background: var(--color-bg-panel);
  grid-template-columns: minmax(120px, 0.25fr) minmax(0, 1fr);
  gap: 20px;
}

.doc-reading-note span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: var(--tracking-mono);
}

.doc-reading-note p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}

.doc-prose {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

.doc-chapter {
  position: relative;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.doc-chapter + .doc-chapter {
  margin-top: var(--doc-chapter-gap);
  padding-top: var(--doc-chapter-gap);
  border-top: var(--line-hairline) solid var(--color-border);
}

.doc-chapter + .doc-chapter::before {
  position: absolute;
  top: -1px;
  left: 0;
  width: var(--doc-rule-width);
  height: var(--line-strong);
  content: "";
  background: var(--color-accent);
}

.chapter-mark {
  display: inline-flex;
  min-height: 30px;
  margin-bottom: 20px;
  padding: 4px 12px;
  border: var(--line-hairline) solid var(--color-accent-medium);
  background: var(--color-accent-faint);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--doc-index-size);
  align-items: center;
  letter-spacing: var(--tracking-mono);
}

.doc-prose h2 {
  padding-top: 0;
}

.doc-prose h3 {
  margin-top: 1.8em;
  padding-top: 0;
  color: var(--color-text);
}

.doc-prose p {
  margin-bottom: var(--doc-copy-gap);
}

.doc-prose pre,
.doc-prose .table-wrap,
.doc-prose .callout {
  margin-top: 30px;
  margin-bottom: 34px;
}

.doc-prose .table-wrap {
  box-shadow: var(--shadow-card);
}

.doc-prose .data-table td:first-child {
  color: var(--color-text);
}

.doc-next-panel {
  position: relative;
  overflow: hidden;
}

.doc-next-panel::after {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 42px;
  height: 42px;
  border-top: var(--line-hairline) solid var(--color-accent);
  border-right: var(--line-hairline) solid var(--color-accent);
  content: "";
  pointer-events: none;
}

.doc-next-panel h3 {
  margin-top: 10px;
}

.doc-next-grid {
  display: grid;
  margin-top: 30px;
  border-top: var(--line-hairline) solid var(--color-border);
  border-left: var(--line-hairline) solid var(--color-border);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.doc-next-grid a {
  display: flex;
  min-width: 0;
  min-height: 132px;
  padding: 22px;
  border-right: var(--line-hairline) solid var(--color-border);
  border-bottom: var(--line-hairline) solid var(--color-border);
  background: var(--color-bg-panel);
  flex-direction: column;
  transition:
    background-color var(--motion-fast) ease,
    transform var(--motion-fast) ease;
}

.doc-next-grid a:hover,
.doc-next-grid a:focus-visible {
  background: var(--color-accent-faint);
  transform: translateY(-2px);
}

.doc-next-grid strong {
  margin-bottom: 8px;
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: 21px;
}

.doc-next-grid span {
  color: var(--color-text-muted);
  font-size: 14px;
}

@media (max-width: 760px) {
  .doc-hero::before {
    right: var(--gutter);
    width: 42vw;
  }

  .doc-reading-note {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .doc-next-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  :root {
    --doc-chapter-gap: 72px;
  }

  .doc-hero h1 {
    font-size: clamp(46px, 14vw, 66px);
  }

  .doc-hero::before {
    width: 34vw;
    opacity: 0.42;
  }

  .doc-stamps .chip {
    max-width: calc(50% - 4px);
  }

  .doc-prose pre {
    padding: 16px;
    font-size: 12px;
  }

  .doc-prose .callout {
    padding-right: 18px;
    padding-left: 22px;
  }

  .doc-next-grid a {
    min-height: 116px;
    padding: 18px;
  }
}