/* Layout: flow, measure and responsive structure. */
* { box-sizing: border-box; }
html { scroll-behavior: auto; }
body { margin: 0; }
[hidden] { display: none !important; }
img { max-width: 100%; height: auto; }
.page-shell { overflow-wrap: anywhere; }
.page-masthead, .page-main, .page-footer { width: min(100% - 4rem, 78rem); margin-inline: auto; }
.page-masthead { position: relative; display: flex; align-items: start; justify-content: space-between; gap: 2rem; padding-block: 1.5rem; }
.page-brand { display: flex; align-items: center; gap: .9rem; min-height: 64px; padding-block: .25rem; }
.page-brand-sub { display: block; margin-top: .3rem; }
.page-brand-shape { flex: 0 0 28px; width: 28px; height: 28px; }
.page-menu { min-width: 10rem; }
.page-menu > summary { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 52px; padding: .6rem 1rem; }
.page-menu-grid { position: absolute; z-index: 5; left: 0; right: 0; top: 100%; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem 2rem; padding: 1.5rem; }
.page-menu:not([open]) .page-menu-grid, .page-menu-group:not([open]) > ul { display: none; }
.page-menu-group { min-width: 0; }
.page-menu-group summary { min-width: 40px; min-height: 48px; width: 100%; padding-block: .6rem; }
.page-menu-group ul { margin: 0; padding: 0; list-style: none; }
.page-menu-group a { display: flex; align-items: center; min-width: 40px; min-height: 48px; width: 100%; padding: .6rem .5rem; }
.page-intro { margin-block: 2.5rem 3.5rem; padding-top: 1rem; }
.page-intro h1 { max-width: 16ch; margin-block: .55rem 1.25rem; }
.page-intro-home { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); gap: 3rem; align-items: end; }
.page-intro-home h1 { max-width: 11ch; }
.page-lede { max-width: 62ch; margin: 0; }
.page-type-panel { position: relative; overflow: hidden; min-height: 25rem; padding: 2rem; display: flex; align-items: start; }
.page-type-panel p { position: relative; z-index: 1; margin: 0; }
.page-type-circle { position: absolute; inset: 0; clip-path: circle(10rem at calc(100% - 4rem) calc(100% - 3rem)); }
.page-reading-grid { display: grid; grid-template-columns: minmax(0, 15rem) minmax(0, 44rem); gap: 4rem; align-items: start; }
.page-margin { padding-top: 1rem; }
.page-margin dl, .page-margin dd { margin: 0; }
.page-margin dt { margin-bottom: .7rem; }
.page-margin dd + dt { margin-top: 1.5rem; }
.page-margin p { margin-block: 0 1rem; }
.page-copy { min-width: 0; }
.page-section { padding-block: 1.4rem 2rem; }
.page-section h2 { margin-block: 0 1.2rem; }
.page-section p { margin-block: 0 1rem; }
.page-list { margin-block: 1rem 1.5rem; padding-left: 1.4rem; }
.page-list li { padding-left: .3rem; margin-bottom: .8rem; }
.page-reading-links { display: grid; gap: 1rem; margin-block: 1rem 3rem; }
.page-reading-link { position: relative; display: grid; gap: .55rem; padding: 1.3rem 3.5rem 1.3rem 1.3rem; }
.page-reading-arrow { position: absolute; right: 1rem; top: 1.3rem; }
.page-evidence { padding-block: 1.4rem 2rem; }
.page-evidence h2 { margin-block: 0 1.2rem; }
.page-evidence-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; list-style: none; padding: 0; margin: 0; }
.page-evidence-card a { min-height: 76px; height: 100%; padding: 1rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.page-next { margin-block: 2rem 3.5rem; }
.page-next a { display: grid; grid-template-columns: 1fr auto; gap: .4rem 1rem; padding: 1.5rem; min-height: 100px; }
.page-next a > span:first-child { grid-column: 1 / -1; }
.page-next strong { font-weight: 600; }
.page-footer { display: grid; grid-template-columns: minmax(0, 40rem) 1fr; gap: 3rem; padding-block: 2rem 3rem; }
.page-footer p { margin: 0; }
.page-footer nav { display: flex; flex-wrap: wrap; gap: .5rem; justify-content: end; }
.page-footer a { display: flex; align-items: center; min-height: 48px; padding: .5rem .75rem; }
.page-skip { position: absolute; left: 1rem; top: -10rem; z-index: 10; padding: .75rem 1rem; min-height: 48px; }
.page-skip:focus { top: .5rem; }
.page-comparison { padding-block: 1.4rem 2rem; }
.page-comparison h2 { margin-top: 0; }
.page-compare-controls { display: flex; flex-wrap: wrap; gap: .5rem; margin-block: 1.5rem; }
.page-compare-controls button { min-height: 48px; padding: .7rem 1rem; }
.page-compare-status { width: 100%; margin: .5rem 0 0; }
.page-compare-part { padding-top: 1.25rem; margin-top: 1rem; }
.page-compare-part h3 { margin: 0 0 1rem; }
.page-compare-columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.page-compare-columns > div { padding: 1.25rem; }
.page-compare-columns h4 { margin: 0 0 .75rem; }
.page-compare-columns p { margin: 0; }
.page-emergency { padding: 1.3rem; }
@media (max-width: 760px) {
  .page-masthead, .page-main, .page-footer { width: calc(100% - 2.5rem); }
  .page-masthead { gap: .75rem; padding-block: 1rem; flex-wrap: wrap; }
  .page-menu { min-width: 8rem; margin-left: auto; }
  .page-menu-grid { position: static; grid-template-columns: 1fr; padding: 1rem; }
  .page-menu[open] { width: 100%; }
  .page-menu[open] > summary { max-width: 12rem; margin-left: auto; }
  .page-intro { margin-block: 1.5rem 2rem; }
  .page-intro-home { grid-template-columns: 1fr; gap: 1.5rem; }
  .page-type-panel { min-height: 10rem; padding: 1.25rem; }
  .page-type-circle { clip-path: circle(6.5rem at calc(100% - 1.5rem) calc(100% - 1.5rem)); }
  .page-reading-grid { grid-template-columns: minmax(0, 1fr); gap: 2rem; }
  .page-margin { padding: 1rem 1rem 0; }
  .page-margin dt { margin-bottom: .5rem; }
  .page-section { padding-bottom: 1.25rem; }
  .page-evidence-list, .page-compare-columns { grid-template-columns: minmax(0, 1fr); }
  .page-footer { grid-template-columns: 1fr; gap: 1.5rem; }
  .page-footer nav { justify-content: start; }
}
@media print {
  .page-masthead, .page-footer, .page-skip, .page-next, .page-compare-controls { display: none; }
  .page-main { width: 100%; }
  .page-reading-grid { grid-template-columns: 12rem 1fr; gap: 2rem; }
  .page-compare-part[hidden] { display: block !important; }
  .page-section, .page-evidence-card, .page-compare-part { break-inside: avoid; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}