.manual-hero {
  position: relative;
  max-width: 100%;
  overflow-x: clip;
  padding-top: 82px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(ellipse at 34% 0%, var(--color-paper-glow), transparent 56%),
    linear-gradient(to bottom, var(--color-honey-soft), var(--color-bg));
}

.manual-hero::after {
  position: absolute;
  inset: 0;
  opacity: 0.22;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 28px 28px;
  content: "";
  pointer-events: none;
  mask-image: linear-gradient(to bottom, var(--color-text), transparent);
}

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

.manual-hero h1 {
  max-width: 760px;
  margin-top: 22px;
  margin-bottom: 20px;
}

.manual-lede {
  max-width: 720px;
  color: var(--color-muted);
  font-size: 18px;
}

.manual-relations {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 32px;
}

.manual-relations > div {
  padding: 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.manual-relations strong {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-display);
  font-size: 16px;
}

.manual-relations p {
  margin: 0;
  color: var(--color-muted);
}

.manual-relations a,
.chapter-content a:not(.btn) {
  color: var(--color-accent);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.manual-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.manual-facts li {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  padding: 5px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
}

.manual-facts .counter-stat {
  min-width: 0;
  margin-right: 1px;
}

.manual-layout {
  position: relative;
  padding-top: 42px;
  padding-bottom: 104px;
}

.manual-layout .toc-tabs {
  margin-bottom: 48px;
}

.manual-chapter {
  position: relative;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 24px;
  max-width: 920px;
  margin-inline: auto;
  padding-top: 52px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--color-border);
}

.manual-chapter:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.chapter-mark {
  position: sticky;
  top: calc(var(--header-height) + 86px);
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  align-self: start;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background: var(--color-honey-soft);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 800;
  box-shadow: var(--shadow-card);
}

.chapter-content {
  min-width: 0;
}

.chapter-content h2 {
  max-width: 760px;
  margin-bottom: 34px;
}

.chapter-content h3 {
  margin-top: 38px;
  font-size: 23px;
}

.chapter-content p,
.chapter-content li {
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.9;
}

.chapter-content p {
  margin-bottom: 20px;
}

.chapter-content .eyebrow {
  margin-bottom: 8px;
  color: var(--color-accent);
  font-size: 11px;
  line-height: 1.5;
}

.chapter-content .callout {
  margin: 30px 0;
  color: var(--color-muted);
  line-height: 1.8;
}

.chapter-content pre {
  margin: 28px 0;
  color: var(--color-accent-dark);
  font-size: 13px;
  line-height: 1.75;
}

.chapter-content .table-scroll {
  margin: 28px 0 34px;
}

.chapter-content .data-table,
.chapter-content .compare-table {
  font-size: 14px;
}

.chapter-content .data-table td,
.chapter-content .compare-table td {
  color: var(--color-muted);
  line-height: 1.7;
}

.diagnostic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 26px 0 30px;
}

.diagnostic-card {
  padding: 19px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.diagnostic-card:nth-child(2) {
  background: var(--color-mint);
}

.diagnostic-card:nth-child(3) {
  background: var(--color-mist);
}

.diagnostic-card:nth-child(4) {
  background: var(--color-lilac);
}

.diagnostic-card strong {
  display: block;
  margin-bottom: 7px;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 16px;
}

.diagnostic-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

.manual-finish {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  margin-top: 48px;
  padding: 26px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel-soft);
  box-shadow: var(--shadow-panel);
}

.manual-finish strong {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-display);
  font-size: 21px;
}

.manual-finish p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

@media (max-width: 768px) {
  .manual-hero {
    padding-top: 58px;
    padding-bottom: 56px;
  }

  .manual-lede {
    font-size: 16px;
  }

  .manual-relations {
    grid-template-columns: 1fr;
  }

  .manual-layout {
    padding-top: 30px;
    padding-bottom: 76px;
  }

  .manual-chapter {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 16px;
    padding-top: 40px;
    padding-bottom: 58px;
  }

  .chapter-mark {
    width: 40px;
    height: 40px;
  }

  .chapter-content h3 {
    margin-top: 32px;
    font-size: 21px;
  }

  .chapter-content p,
  .chapter-content li {
    font-size: 15px;
    line-height: 1.85;
  }

  .diagnostic-grid {
    grid-template-columns: 1fr;
  }

  .manual-finish {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .manual-hero {
    padding-top: 44px;
    padding-bottom: 48px;
  }

  .manual-hero::after {
    background-size: 22px 22px;
  }

  .manual-relations > div {
    padding: 15px;
  }

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

  .manual-facts li {
    justify-content: center;
    text-align: center;
  }

  .manual-layout .toc-tabs {
    margin-bottom: 28px;
  }

  .manual-chapter {
    display: block;
    padding-top: 38px;
    padding-bottom: 52px;
  }

  .chapter-mark {
    position: static;
    width: 36px;
    height: 36px;
    margin-bottom: 18px;
  }

  .chapter-content h2 {
    margin-bottom: 28px;
  }

  .chapter-content h3 {
    font-size: 20px;
  }

  .chapter-content pre {
    padding: 14px;
    font-size: 12px;
  }

  .manual-finish {
    padding: 20px;
  }

  .manual-finish .btn {
    width: 100%;
  }
}

@media (max-width: 360px) {
  .manual-facts {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .chapter-mark {
    position: static;
  }
}