.manual-hero {
  border-bottom: var(--border-heavy) solid var(--color-border);
  background-image:
    linear-gradient(var(--color-grid) var(--border-medium), var(--color-transparent) var(--border-medium)),
    linear-gradient(90deg, var(--color-grid) var(--border-medium), var(--color-transparent) var(--border-medium));
  background-size: 36px 36px;
}

.manual-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  border: var(--border-heavy) solid var(--color-border);
  background: var(--color-panel);
}

.manual-hero-copy {
  padding: clamp(28px, 5vw, 64px);
  border-right: var(--border-heavy) solid var(--color-border);
}

.manual-hero-copy .kicker {
  margin-top: 28px;
  margin-bottom: 14px;
}

.manual-hero-copy h1 {
  max-width: 800px;
  margin-bottom: 24px;
}

.manual-lead {
  max-width: 750px;
  margin-bottom: 28px;
  color: var(--color-muted);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.8;
}

.manual-route-board {
  padding: clamp(24px, 4vw, 42px);
  color: var(--color-light-ink);
  background: var(--color-border);
}

.manual-route-board .mono-label {
  color: var(--color-warn);
}

.manual-route-board > p {
  margin-top: 26px;
  margin-bottom: 0;
  color: var(--color-light-ink);
  opacity: 0.78;
}

.manual-route-list {
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  list-style: none;
}

.manual-route-list li {
  min-height: 64px;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  align-items: center;
  border-top: var(--border-medium) solid var(--color-muted);
}

.manual-route-list li:last-child {
  border-bottom: var(--border-medium) solid var(--color-muted);
}

.manual-route-list span {
  color: var(--color-warn);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 900;
}

.manual-route-list strong {
  color: var(--color-light-ink);
  font-family: var(--font-display);
  font-size: 1rem;
}

.manual-intro {
  max-width: 940px;
}

.manual-intro h3 {
  margin-top: 10px;
}

.manual-intro p {
  color: var(--color-muted);
}

.manual-prose {
  max-width: 920px;
  margin-inline: auto;
}

.doc-chapter {
  position: relative;
  padding-top: 30px;
  scroll-margin-top: 30px;
}

.doc-chapter + .doc-chapter {
  margin-top: clamp(76px, 9vw, 120px);
  padding-top: clamp(42px, 6vw, 68px);
  border-top: var(--border-heavy) solid var(--color-border);
}

.doc-chapter + .doc-chapter::before {
  content: "";
  position: absolute;
  top: calc(var(--border-heavy) * -1);
  left: 0;
  width: 116px;
  height: 12px;
  background: var(--color-accent);
}

.chapter-index {
  display: inline-block;
  margin-bottom: 14px;
  padding: 6px 10px;
  border: var(--border-medium) solid var(--color-border);
  color: var(--color-panel);
  background: var(--color-success);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.manual-prose h2 {
  margin-top: 0;
  scroll-margin-top: 24px;
}

.manual-prose h3 {
  padding-left: 15px;
  border-left: 8px solid var(--color-accent);
}

.manual-prose p,
.manual-prose li {
  text-align: justify;
}

.manual-prose .table-wrap {
  margin-top: 30px;
  margin-bottom: 32px;
}

.manual-prose .data-table {
  font-size: 0.92rem;
}

.manual-prose pre {
  margin-top: 28px;
  margin-bottom: 30px;
}

@media (max-width: 840px) {
  .manual-hero-grid {
    grid-template-columns: 1fr;
  }

  .manual-hero-copy {
    border-right: 0;
    border-bottom: var(--border-heavy) solid var(--color-border);
  }

  .manual-route-board {
    padding-top: 30px;
    padding-bottom: 30px;
  }
}

@media (max-width: 640px) {
  .manual-hero-copy {
    padding: 26px 20px;
  }

  .manual-hero-copy .kicker {
    margin-top: 22px;
  }

  .manual-lead {
    font-size: 16px;
    text-align: left;
  }

  .manual-route-board {
    padding: 24px 20px;
  }

  .manual-route-list li {
    grid-template-columns: 42px minmax(0, 1fr);
  }

  .manual-intro {
    padding: 22px 20px;
  }

  .manual-prose p,
  .manual-prose li {
    text-align: left;
  }

  .doc-chapter {
    scroll-margin-top: 18px;
  }

  .doc-chapter + .doc-chapter {
    margin-top: 70px;
    padding-top: 48px;
  }

  .manual-prose h3 {
    padding-left: 11px;
    border-left-width: 6px;
  }

  .manual-prose pre {
    padding: 16px;
    font-size: 0.78rem;
  }
}