:root {
  color-scheme: light;
  --ink: #000000;
  --paper: #ffffff;
  --signal: #ff0000;
  --link: #0000ff;
  --grey: #808080;
  --mark: #ffff00;
  --reading-font: Optima, Candara, "Segoe UI", "Trebuchet MS", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 24px; scroll-padding-bottom: 120px; }
body { margin: 0; padding: 24px 24px 144px; color: var(--ink); background: var(--paper); font: 400 16px/1.6 var(--reading-font); }
[hidden] { display: none !important; }
::selection { color: var(--ink); background: var(--mark); }
a { color: var(--link); text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 4px; }
a:hover { color: var(--ink); background: var(--mark); }
a, button, summary { -webkit-tap-highlight-color: var(--mark); }
:focus-visible { outline: 4px solid var(--link); outline-offset: 4px; }
main:focus { outline: none; }
.site-width { width: 100%; max-width: 1280px; margin-inline: auto; }
.masthead { display: grid; grid-template-columns: minmax(0, 1fr) auto; border: 4px solid var(--ink); }
.masthead p { margin: 0; padding: 16px 24px; }
.site-name { font-weight: 700; letter-spacing: 0.035em; }
.guide-label { border-left: 4px solid var(--ink); background: var(--mark); }
.brief-label { margin: 32px 0 16px; font-weight: 700; letter-spacing: 0.04em; }
h1, h2, h3, p, ul, dl, figure { margin-top: 0; }
h1, h2, h3 { font-weight: 700; line-height: 1.1; text-wrap: balance; }
h1 { margin-bottom: 24px; font-size: clamp(2.5rem, 5.2vw, 4rem); letter-spacing: -0.035em; }
h1 span { display: block; }
h2 { margin-bottom: 24px; font-size: clamp(1.75rem, 3vw, 2.5rem); letter-spacing: -0.02em; }
h3 { margin-bottom: 16px; font-size: 1.5rem; }
p { max-width: 72ch; margin-bottom: 16px; }
li, dd { font-size: 16px; }
ul { padding-left: 24px; }
li + li { margin-top: 8px; }
.lead { max-width: 60ch; font-size: 18px; }
.section-label { margin-bottom: 16px; font-weight: 700; letter-spacing: 0.04em; }
.question-heading { max-width: 36ch; }
.answer-copy { min-width: 0; }
.source-drawer { margin: 24px 0 0; border-top: 2px solid currentColor; max-width: 72ch; }
.source-drawer summary { display: list-item; min-height: 52px; padding: 12px 8px 12px 0; font-size: 16px; font-weight: 700; line-height: 1.6; cursor: pointer; overflow-wrap: anywhere; }
.source-drawer[open] summary { border-bottom: 2px solid currentColor; }
.source-links { margin: 0; padding: 8px 0 8px 24px; }
.source-links li { margin: 0; }
.source-link { display: inline-flex; align-items: center; gap: 8px; min-height: 48px; padding: 8px 0; max-width: 100%; }
.source-link span { flex: 0 0 auto; }
.next-link { display: inline-flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 56px; padding: 16px 24px; border: 3px solid var(--ink); background: var(--paper); font-weight: 700; font-size: 16px; max-width: 100%; }
.next-link span { flex: 0 0 auto; }
.page-turn { margin-top: 48px; }
.site-footer { margin-top: 64px; padding-top: 24px; border-top: 4px solid var(--ink); display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-start; gap: 16px 32px; }
.site-footer p { font-size: 16px; flex: 1 1 40ch; margin: 0; }
.text-link { display: inline-flex; align-items: center; min-height: 48px; padding: 8px 16px; border: 2px solid var(--ink); font-size: 16px; }
.bottom-dock { position: fixed; z-index: 10; bottom: 16px; left: 50%; transform: translateX(-50%); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); width: calc(100% - 32px); max-width: 720px; background: var(--paper); border: 4px solid var(--ink); box-shadow: 8px 8px 0 var(--grey); }
.bottom-dock a { display: flex; align-items: center; justify-content: center; padding: 16px 8px; min-height: 60px; text-align: center; font-size: 16px; font-weight: 700; line-height: 1.4; }
.bottom-dock a + a { border-left: 3px solid var(--ink); }
.bottom-dock a[aria-current="page"] { background: var(--ink); color: var(--paper); text-decoration-color: var(--mark); }
.bottom-dock a[aria-current="page"]:hover { background: var(--link); }
.skip-link { position: fixed; z-index: 20; inset: 8px auto auto 24px; transform: translateY(-160%); min-height: 48px; padding: 12px 16px; border: 3px solid var(--ink); color: var(--ink); background: var(--mark); }
.skip-link:focus { transform: none; }

@media (max-width: 680px) {
  .masthead { grid-template-columns: 1fr; }
  .masthead p { padding: 12px 16px; }
  .guide-label { border-left: 0; border-top: 3px solid var(--ink); }
  .brief-label { margin-top: 24px; letter-spacing: 0; }
  .site-footer { margin-top: 48px; }
  .next-link { padding: 12px 16px; gap: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

@media print {
  body { padding: 16px; }
  .bottom-dock, .skip-link, .myth-trigger { display: none !important; }
  .myth-answer[hidden] { display: block !important; }
  .site-footer { margin-top: 24px; }
  .source-drawer { break-inside: avoid; }
  h1 { font-size: 2.5rem; }
}