.manual-hero {
  padding-top: clamp(56px, 8vw, 104px);
  padding-bottom: clamp(54px, 7vw, 92px);
  border-bottom: 1px solid var(--color-border);
}

.manual-hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(290px, 0.65fr);
  align-items: end;
  gap: clamp(42px, 7vw, 90px);
}

.manual-hero-copy h1 {
  max-width: 850px;
  margin-top: 18px;
  font-size: clamp(34px, 4vw, 48px);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.manual-hero-copy .lead {
  margin-top: 28px;
}

.manual-hero-copy .lead a {
  color: var(--color-text);
  font-weight: 750;
  text-decoration: underline;
  text-decoration-color: var(--color-accent-strong);
  text-underline-offset: 0.2em;
}

.manual-hero-copy .button-row {
  margin-top: 28px;
}

.manual-route {
  overflow: hidden;
  border: 1px solid var(--color-engine-line);
  border-radius: var(--radius-large);
  background: var(--color-engine);
  color: var(--color-engine-text);
}

.manual-route-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-engine-line);
  padding: 15px 18px;
  color: var(--color-engine-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.manual-route ol {
  list-style: none;
  padding: 8px 0;
}

.manual-route li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--color-engine-line);
  padding: 10px 18px;
}

.manual-route li:last-child {
  border-bottom: 0;
}

.manual-route li span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
}

.manual-route li strong {
  color: var(--color-engine-text);
  font-size: 13px;
  font-weight: 650;
}

.manual-content {
  padding-bottom: var(--space-section);
}

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

.manual-chapter {
  padding-top: clamp(76px, 9vw, 124px);
  scroll-margin-top: calc(var(--header-height) + 18px);
}

.manual-chapter + .manual-chapter {
  margin-top: clamp(34px, 5vw, 70px);
  border-top: 1px solid var(--color-border);
}

.manual-prose .manual-chapter > * + * {
  margin-top: 1.25em;
}

.chapter-heading {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
  margin-bottom: 42px;
}

.chapter-heading .chapter-number {
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 48px);
  font-weight: 800;
  line-height: 1;
}

.chapter-heading h2 {
  margin-top: 8px;
}

.manual-prose h3 {
  padding-top: 0.35em;
}

.manual-prose .table-wrap {
  margin-top: 30px;
  margin-bottom: 30px;
}

.manual-prose .callout {
  margin-top: 32px;
  margin-bottom: 32px;
}

.manual-prose pre {
  margin-top: 28px;
  margin-bottom: 28px;
}

@media (max-width: 860px) {
  .manual-hero-layout {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .manual-route {
    max-width: 560px;
  }
}

@media (max-width: 640px) {
  .manual-hero {
    padding-top: 42px;
    padding-bottom: 52px;
  }

  .manual-hero-copy h1 {
    font-size: clamp(24px, 7vw, 30px);
    line-height: 1.08;
  }

  .manual-route {
    width: 100%;
  }

  .chapter-heading {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 30px;
  }

  .chapter-heading .chapter-number {
    font-size: 28px;
  }

  .manual-chapter {
    padding-top: 72px;
  }

  .manual-chapter + .manual-chapter {
    margin-top: 30px;
  }
}