.handbook-hero {
  padding-bottom: clamp(40px, 6vw, 72px);
}

.handbook-hero h1 {
  max-width: 820px;
  margin-bottom: 22px;
}

.handbook-hero .lede {
  max-width: 820px;
}

.handbook-intro {
  display: grid;
  max-width: 900px;
  gap: 12px;
  margin-top: 30px;
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
}

.handbook-intro p {
  margin-bottom: 0;
  color: var(--color-muted);
}

.handbook-intro a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.diagnostic-strip {
  display: flex;
  max-width: 100%;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.diagnostic-strip span {
  display: inline-flex;
  max-width: 100%;
  min-height: 34px;
  align-items: center;
  padding: 6px 13px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: nowrap;
}

.diagnostic-strip span:first-child {
  border-color: var(--color-accent);
  color: var(--color-accent);
  box-shadow: inset 0 0 12px var(--color-accent-soft);
}

.handbook-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  padding-top: 12px;
  padding-bottom: 12px;
  background: var(--color-bg);
}

.handbook-body {
  display: grid;
  gap: clamp(70px, 10vw, 128px);
  padding-top: clamp(64px, 8vw, 104px);
  padding-bottom: var(--space-section);
}

.doc-chapter {
  scroll-margin-top: 92px;
  padding: clamp(26px, 5vw, 58px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
}

.chapter-heading {
  max-width: 820px;
  margin-bottom: 38px;
  padding-bottom: 25px;
  border-bottom: 1px solid var(--color-border);
}

.chapter-heading h2 {
  margin-bottom: 0;
}

.doc-chapter .prose {
  max-width: 900px;
}

.doc-chapter .prose > p {
  margin-bottom: 1.35em;
}

.doc-chapter .prose h3 {
  margin-bottom: 16px;
  padding-top: 4px;
}

.doc-chapter .prose pre {
  margin-top: 25px;
  margin-bottom: 25px;
  background: var(--color-bg);
}

.doc-chapter .table-scroll {
  margin-top: 28px;
  margin-bottom: 30px;
  border-radius: var(--radius-lg);
}

.doc-chapter table {
  min-width: 680px;
}

.doc-chapter th {
  font-family: var(--font-mono);
  font-size: 13px;
}

.doc-chapter td {
  color: var(--color-muted);
}

.check-flow {
  display: grid;
  gap: 12px;
  margin-top: 24px;
  margin-bottom: 28px;
  padding-left: 0;
  list-style: none;
  counter-reset: handbook-step;
}

.check-flow li {
  position: relative;
  min-height: 46px;
  padding: 11px 14px 11px 52px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel-raised);
  counter-increment: handbook-step;
}

.check-flow li::before {
  position: absolute;
  top: 11px;
  left: 14px;
  display: grid;
  width: 27px;
  height: 27px;
  place-items: center;
  border: 1px solid var(--color-accent-dark);
  border-radius: var(--radius-pill);
  color: var(--color-accent);
  content: counter(handbook-step);
  font-family: var(--font-mono);
  font-size: 11px;
}

@media (max-width: 760px) {
  .handbook-nav {
    top: 0;
  }

  .doc-chapter {
    padding: 24px;
  }

  .chapter-heading {
    margin-bottom: 28px;
  }

  .diagnostic-strip {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .diagnostic-strip span {
    justify-content: center;
  }
}

@media (max-width: 420px) {
  .diagnostic-strip {
    grid-template-columns: 1fr;
  }

  .doc-chapter {
    padding: 20px;
  }

  .check-flow li {
    padding-right: 12px;
  }
}