:root {
  --manual-hero-space-top: 108px;
  --manual-hero-space-bottom: 82px;
  --manual-chapter-space: 96px;
  --manual-copy-size: 17px;
  --manual-copy-leading: 1.9;
  --manual-panel-padding: 32px;
  --manual-grid-gap: 34px;
  --manual-rule-width: 3px;
}

.manual-hero {
  position: relative;
  overflow-x: clip;
  padding-top: var(--manual-hero-space-top);
  padding-bottom: var(--manual-hero-space-bottom);
  border-bottom: 1px solid var(--color-border-soft);
}

.manual-hero::before {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--color-dot) 1px, transparent 1.5px);
  background-size: 28px 28px;
  content: "";
  pointer-events: none;
}

.manual-hero::after {
  position: absolute;
  top: -42%;
  right: -18%;
  width: min(70vw, 860px);
  height: min(70vw, 860px);
  background: radial-gradient(circle, var(--color-glow), transparent 64%);
  content: "";
  pointer-events: none;
}

.manual-hero .reading-wrap {
  position: relative;
  z-index: 1;
}

.manual-hero h1 {
  max-width: var(--reading-width);
  margin-top: 18px;
}

.manual-lead {
  max-width: var(--reading-width);
  font-size: 19px;
  line-height: 1.85;
}

.manual-fact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.manual-intro {
  padding-bottom: 72px;
}

.manual-intro-grid {
  display: grid;
  grid-template-columns: minmax(220px, .72fr) minmax(0, 1.28fr);
  gap: var(--manual-grid-gap);
  align-items: start;
}

.manual-intro h2 {
  font-size: clamp(28px, 3vw, 40px);
}

.manual-intro a,
.manual-article a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-dark);
  text-underline-offset: 3px;
}

.manual-article {
  border-top: 1px solid var(--color-border-soft);
  background: var(--color-bg);
}

.manual-article .toc-tabs {
  top: 10px;
  margin-top: 28px;
}

.manual-chapter {
  position: relative;
  padding-top: var(--manual-chapter-space);
  padding-bottom: var(--manual-chapter-space);
  border-bottom: 1px solid var(--color-border-soft);
}

.manual-chapter::before {
  position: absolute;
  top: var(--manual-chapter-space);
  left: -22px;
  width: var(--manual-rule-width);
  height: 44px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.chapter-label {
  margin-bottom: 12px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
}

.manual-chapter h2 {
  margin-top: 0;
  margin-bottom: 34px;
}

.manual-chapter h3 {
  margin-top: 48px;
  margin-bottom: 14px;
  font-size: clamp(21px, 2.2vw, 27px);
}

.manual-chapter p,
.manual-chapter li {
  font-size: var(--manual-copy-size);
  line-height: var(--manual-copy-leading);
}

.manual-chapter .callout,
.manual-chapter .table-scroll,
.manual-chapter pre {
  margin-top: 34px;
  margin-bottom: 34px;
}

.manual-chapter pre {
  background: var(--color-panel-raised);
}

.manual-chapter .table-scroll {
  background: var(--color-panel);
}

.manual-next {
  background: var(--color-panel);
}

.manual-next-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(220px, .75fr);
  gap: var(--manual-grid-gap);
  padding: var(--manual-panel-padding);
  background: var(--color-panel-raised);
}

.manual-next-panel h2 {
  margin-bottom: 10px;
  font-size: clamp(28px, 3vw, 40px);
}

.manual-link-list {
  display: grid;
  align-content: center;
  gap: 8px;
}

.manual-link-list a {
  display: flex;
  min-height: 48px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition:
    background var(--transition-fast),
    color var(--transition-fast);
}

.manual-link-list a:hover {
  background: var(--color-panel);
  color: var(--color-accent);
}

@media (max-width: 860px) {
  :root {
    --manual-hero-space-top: 82px;
    --manual-hero-space-bottom: 66px;
    --manual-chapter-space: 76px;
  }

  .manual-intro-grid,
  .manual-next-panel {
    grid-template-columns: 1fr;
  }

  .manual-chapter::before {
    left: 0;
    height: 34px;
  }

  .manual-chapter h2,
  .manual-chapter .chapter-label {
    padding-left: 16px;
  }
}

@media (max-width: 640px) {
  :root {
    --manual-hero-space-top: 64px;
    --manual-hero-space-bottom: 54px;
    --manual-chapter-space: 64px;
    --manual-copy-size: 16px;
    --manual-panel-padding: 22px;
  }

  .manual-lead {
    font-size: 17px;
  }

  .manual-fact-row {
    gap: 8px;
  }

  .manual-chapter h3 {
    margin-top: 38px;
  }

  .manual-next-panel {
    gap: 22px;
  }
}