.doc-hero {
  padding-top: clamp(72px, 9vw, 128px);
  padding-bottom: clamp(54px, 7vw, 92px);
  border-bottom: 1px solid var(--color-line);
}

.doc-hero .reading-wrap {
  position: relative;
}

.doc-hero h1 {
  max-width: 11em;
}

.doc-hero-lede {
  max-width: 42em;
  margin-top: 24px;
  margin-bottom: 0;
  color: var(--color-ink-soft);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.85;
}

.doc-fact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 34px;
}

.doc-fact-row span {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  padding: 7px 13px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
}

.doc-layout {
  padding-top: clamp(46px, 6vw, 78px);
  padding-bottom: var(--space-section);
}

.doc-intro {
  margin-bottom: 34px;
  padding: clamp(22px, 4vw, 36px);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: 16px;
}

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

.doc-layout .toc-tabs {
  margin-bottom: clamp(58px, 8vw, 96px);
}

.handbook-prose {
  counter-reset: handbook-chapter;
}

.doc-chapter {
  position: relative;
  padding-top: clamp(52px, 7vw, 88px);
  padding-bottom: clamp(52px, 7vw, 88px);
  border-top: 1px solid var(--color-line);
  counter-increment: handbook-chapter;
}

.doc-chapter:first-child {
  padding-top: 0;
  border-top: 0;
}

.doc-chapter h2 {
  max-width: 14em;
  scroll-margin-top: var(--toc-offset);
}

.doc-chapter h2::before {
  display: inline-flex;
  min-width: 2.3em;
  margin-right: 0.35em;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.34em;
  letter-spacing: 0.08em;
  vertical-align: middle;
  content: counter(handbook-chapter, decimal-leading-zero);
}

.chapter-code {
  display: block;
  margin-bottom: 15px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.14em;
}

.handbook-prose h3 {
  position: relative;
  margin-top: 2em;
  padding-left: 18px;
  font-family: var(--font-display);
  font-weight: 400;
}

.handbook-prose h3::before {
  position: absolute;
  top: 0.18em;
  bottom: 0.18em;
  left: 0;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.handbook-prose p,
.handbook-prose li {
  overflow-wrap: anywhere;
}

.handbook-prose .table-scroll {
  margin-top: 32px;
  margin-bottom: 32px;
}

.handbook-prose pre {
  position: relative;
  margin-top: 28px;
  margin-bottom: 30px;
  padding-top: 52px;
}

.handbook-prose pre::before {
  position: absolute;
  top: 18px;
  left: 20px;
  width: 9px;
  height: 9px;
  border-radius: var(--radius-pill);
  background: var(--color-error);
  box-shadow:
    17px 0 0 var(--color-warning),
    34px 0 0 var(--color-success);
  content: "";
}

.handbook-prose pre::after {
  position: absolute;
  top: 13px;
  right: 20px;
  color: var(--color-code-white);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  content: "REFERENCE";
}

.handbook-prose .callout {
  margin-top: 34px;
  margin-bottom: 34px;
}

.handbook-prose .callout p {
  margin-bottom: 0;
}

.doc-endnote {
  margin-top: clamp(42px, 6vw, 72px);
  padding: clamp(28px, 5vw, 48px);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
  background: linear-gradient(135deg, var(--color-surface), var(--color-surface-strong));
}

.doc-endnote h3 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 400;
}

.doc-endnote p {
  max-width: 42em;
  color: var(--color-ink-soft);
}

.doc-endnote .button-row {
  margin-top: 24px;
}

@media (max-width: 768px) {
  .doc-hero {
    padding-top: 64px;
    padding-bottom: 54px;
  }

  .doc-fact-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .doc-fact-row span {
    width: 100%;
    border-radius: var(--radius-small);
  }

  .doc-layout {
    padding-top: 38px;
  }

  .doc-layout .toc-tabs {
    margin-bottom: 64px;
  }

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

  .doc-chapter h2 {
    max-width: none;
  }

  .handbook-prose h3 {
    padding-left: 15px;
  }
}

@media (max-width: 640px) {
  .doc-intro {
    padding: 20px;
  }

  .doc-chapter h2::before {
    display: block;
    margin-right: 0;
    margin-bottom: 9px;
  }

  .handbook-prose pre {
    padding: 50px 16px 18px;
    font-size: 13px;
  }

  .doc-endnote {
    padding: 24px 20px;
  }
}