:root {
  --deepdoc-hero-width: 760px;
  --deepdoc-content-width: 1080px;
  --deepdoc-toc-width: 220px;
  --deepdoc-chapter-gap: clamp(72px, 9vw, 112px);
  --deepdoc-rule-size: 44px;
  --deepdoc-line-width: 1px;
}

.doc-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--deepdoc-line-width) solid var(--color-border);
  background: var(--color-page);
}

.doc-hero::after {
  position: absolute;
  top: 12%;
  right: -12%;
  width: min(46vw, 620px);
  height: min(46vw, 620px);
  border-radius: var(--radius-pill);
  background: radial-gradient(closest-side, var(--color-accent-glow-soft), transparent);
  content: "";
  pointer-events: none;
}

.doc-hero .reading-wrap {
  position: relative;
  z-index: 1;
  max-width: calc(var(--deepdoc-hero-width) + var(--gutter) * 2);
}

.doc-hero h1 {
  margin-top: 22px;
}

.doc-hero .fact-row {
  margin-top: 26px;
}

.doc-intro-note {
  margin-top: 32px;
  margin-bottom: 0;
}

.doc-intro-note a,
.doc-prose a {
  color: var(--color-accent-deep);
  font-weight: 650;
  text-decoration: underline;
  text-decoration-color: var(--color-accent-line);
  text-underline-offset: 3px;
}

.doc-content {
  display: grid;
  max-width: calc(var(--deepdoc-content-width) + var(--gutter) * 2);
  grid-template-columns: var(--deepdoc-toc-width) minmax(0, 1fr);
  gap: clamp(30px, 5vw, 68px);
  align-items: start;
}

.doc-content > .toc {
  flex-direction: column;
  border-radius: var(--radius-lg);
}

.doc-content > .toc a {
  width: 100%;
  flex: 0 0 auto;
  white-space: normal;
}

.doc-prose {
  min-width: 0;
}

.doc-chapter {
  position: relative;
  scroll-margin-top: calc(var(--header-height) + 28px);
}

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

.chapter-index {
  display: grid;
  width: var(--deepdoc-rule-size);
  height: var(--deepdoc-rule-size);
  margin-bottom: 18px;
  place-items: center;
  border: var(--deepdoc-line-width) solid var(--color-accent-line);
  border-radius: var(--radius-md);
  background: var(--color-accent-soft);
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 750;
}

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

.doc-prose h3 {
  margin-top: 2em;
  padding-left: 16px;
  border-left: 4px solid var(--color-accent);
}

.doc-prose p,
.doc-prose li {
  color: var(--color-muted);
}

.doc-prose table {
  margin-top: 28px;
  margin-bottom: 32px;
}

.doc-prose pre {
  margin-top: 24px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-soft);
}

.doc-prose .callout p {
  color: var(--color-text);
}

.doc-prose .callout > :last-child {
  margin-bottom: 0;
}

.doc-prose .end-store-card {
  margin-top: var(--deepdoc-chapter-gap);
}

@media (max-width: 920px) {
  .doc-content {
    grid-template-columns: 1fr;
  }

  .doc-content > .toc {
    flex-direction: row;
    border-radius: var(--radius-pill);
  }

  .doc-content > .toc a {
    width: auto;
    white-space: nowrap;
  }
}

@media (max-width: 640px) {
  .doc-hero::after {
    top: 30%;
    right: -48%;
    width: 420px;
    height: 420px;
  }

  .doc-prose h3 {
    padding-left: 12px;
  }

  .doc-chapter + .doc-chapter {
    margin-top: 64px;
    padding-top: 64px;
  }

  .doc-prose pre {
    padding: 16px;
    font-size: 11.5px;
  }
}