.manual-hero {
  position: relative;
  overflow: clip;
  padding-top: 72px;
  padding-bottom: 86px;
  text-align: center;
}

.manual-hero::before {
  position: absolute;
  top: -190px;
  right: -180px;
  left: -180px;
  height: 620px;
  background:
    radial-gradient(620px 330px at 32% 46%, var(--color-accent-wash), transparent 72%),
    radial-gradient(680px 350px at 72% 42%, var(--color-blue-wash), transparent 74%);
  content: "";
  pointer-events: none;
}

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

.manual-hero h1 {
  max-width: 840px;
  margin: 22px auto 0;
}

.manual-lead {
  max-width: 780px;
  margin: 20px auto 0;
  color: var(--color-ink-muted);
  font-size: 18px;
  line-height: 1.85;
}

.manual-entry-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 13px;
  margin-top: 30px;
}

.manual-relation {
  max-width: 760px;
  margin: 24px auto 0;
  color: var(--color-ink-muted);
  font-size: 14px;
}

.manual-relation a {
  color: var(--color-accent-deep);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--color-accent-wash);
  text-underline-offset: 3px;
}

.manual-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 58px;
  align-items: start;
  padding-top: 34px;
  padding-bottom: var(--section-space);
}

.manual-index {
  position: sticky;
  top: 18px;
  min-width: 0;
}

.manual-index-label {
  margin-bottom: 10px;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
}

.manual-index .toc {
  position: static;
  display: grid;
  width: 100%;
  padding: 12px;
  border-color: var(--color-line-soft);
  box-shadow: var(--shadow-card);
}

.manual-index .toc a {
  width: 100%;
}

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

.manual-chapter {
  min-width: 0;
  padding: 48px;
  border-radius: var(--radius-card);
  background: var(--color-panel);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
  scroll-margin-top: 24px;
}

.manual-chapter + .manual-chapter {
  margin-top: 54px;
}

.manual-chapter > h2 {
  margin-top: 12px;
  margin-bottom: 30px;
}

.manual-chapter > h3 {
  margin-top: 36px;
  margin-bottom: 13px;
  font-size: 22px;
}

.manual-chapter > p {
  color: var(--color-ink-muted);
}

.manual-chapter > p strong {
  color: var(--color-ink);
}

.manual-chapter .callout,
.manual-chapter .data-table-wrap,
.manual-chapter pre {
  margin-top: 28px;
  margin-bottom: 28px;
}

.chapter-number {
  display: inline-flex;
  max-width: 100%;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-soft);
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.manual-chapter pre {
  border-color: var(--color-line-soft);
}

.manual-chapter code {
  font-size: .92em;
}

.manual-chapter p code {
  padding: 2px 6px;
  border-radius: var(--radius-small);
  background: var(--color-panel-muted);
  color: var(--color-ink);
}

.manual-chapter .data-table {
  min-width: 640px;
}

@media (max-width: 960px) {
  .manual-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
  }

  .manual-index {
    position: static;
  }

  .manual-index .toc {
    display: flex;
    width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    box-shadow: var(--shadow-float);
    -webkit-overflow-scrolling: touch;
  }

  .manual-index .toc a {
    width: auto;
    flex-shrink: 0;
  }
}

@media (max-width: 640px) {
  .manual-hero {
    padding-top: 44px;
    padding-bottom: 58px;
  }

  .manual-lead {
    font-size: 16px;
    line-height: 1.75;
  }

  .manual-entry-links {
    gap: 10px;
  }

  .manual-entry-links .button {
    width: 100%;
  }

  .manual-layout {
    padding-top: 20px;
  }

  .manual-chapter {
    padding: 24px;
    border-radius: var(--radius-panel);
    scroll-margin-top: 12px;
  }

  .manual-chapter + .manual-chapter {
    margin-top: 34px;
  }

  .manual-chapter > h2 {
    margin-bottom: 24px;
  }

  .manual-chapter > h3 {
    margin-top: 30px;
    font-size: 20px;
  }

  .manual-chapter .callout {
    padding: 18px 18px 18px 21px;
  }
}