.chapter-main { max-width: 1050px; padding-block: 26px 64px; }
.chapter-back { display: inline-flex; gap: 10px; align-items: center; min-height: 44px; font-size: .875rem; color: var(--muted); }
.chapter-back:hover { color: var(--red); }
.chapter-heading { margin-top: 24px; }
.chapter-heading .eyebrow { margin-bottom: 10px; }
.chapter-heading h1 { font-family: var(--font-display); font-size: clamp(38px, 5vw, 60px); line-height: 1.1; letter-spacing: -.5px; }
.chapter-switcher { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.chapter-switcher a { display: inline-flex; min-height: 44px; align-items: center; border: 1px solid var(--line); padding: 8px 22px; font-size: .875rem; border-radius: 2px; }
.chapter-switcher a[aria-current='page'] { background: var(--charcoal); border-color: var(--charcoal); color: white; }
.chapter-switcher a:hover { border-color: var(--red); }
.diagram-help { margin: 22px 0 10px; font-size: .875rem; color: var(--muted); }
.diagram-scroll { width: 100%; overflow: auto; background: #fff; border: 1px solid var(--line); color-scheme: light; }
.mxgraph { width: 100%; max-width: 100%; min-height: 240px; border: 0 !important; background: #fff; }
.diagram-notice { margin-block: 20px; padding: 16px; background: #f2e7e8; }
.chapter-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px 24px; margin-top: 22px; }
.chapter-bottom a { display: inline-flex; align-items: center; min-height: 44px; font-size: .875rem; color: var(--red); }
.chapter-bottom a:hover { text-decoration: underline; text-underline-offset: 4px; }
.chapter-quick-nav { display: flex; position: fixed; bottom: max(18px, env(safe-area-inset-bottom)); right: 22px; z-index: 20; background: var(--charcoal); color: white; border-radius: 4px; box-shadow: 0 3px 16px #11171930; }
.chapter-quick-nav a { min-height: 46px; padding: 10px 17px; font-size: .875rem; display: flex; align-items: center; }
.chapter-quick-nav a + a { border-left: 1px solid #667074; }
.chapter-page .site-footer { padding-bottom: 84px; }
@media (max-width: 760px) {
  .chapter-main { width: calc(100% - 32px); padding-top: 16px; padding-bottom: 36px; }
  .chapter-heading { margin-top: 18px; }
  .chapter-heading .eyebrow { letter-spacing: 1.5px; }
  .chapter-switcher { margin-top: 20px; }
  .diagram-help { font-size: .875rem; }
  .chapter-quick-nav { right: 16px; }
}
@media print {
  .chapter-back, .chapter-switcher, .diagram-help, .chapter-bottom, .chapter-quick-nav { display: none; }
  .chapter-main { width: 100%; padding: 0; }
  .chapter-heading { margin: 0 0 15px; }
  .diagram-scroll { border: 0; overflow: visible; }
}