/* Existing cool-white / blue site identity; reading pages add no scripts or motion. */
.reading-header .nav-shell { gap: 20px; }
.reading-header .main-nav { flex-wrap: wrap; }
.reading-shell { width: var(--shell); margin: 0 auto; }
.reading-intro { max-width: 900px; padding: 52px 0 32px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 14px; margin-bottom: 26px; }
.breadcrumbs a { text-underline-offset: 4px; }
.reading-intro h1 { margin: 0; font-size: clamp(30px, 3.6vw, 44px); line-height: 1.25; text-wrap: balance; }
.reading-intro .lead { max-width: 45em; font-size: 19px; color: var(--muted); margin: 20px 0; }
.article-meta { color: var(--muted); font-size: 14px; display: flex; flex-wrap: wrap; gap: 8px 24px; }
.reading-layout { display: grid; grid-template-columns: minmax(0, 800px) minmax(170px, 1fr); gap: clamp(32px, 5vw, 72px); align-items: start; padding-bottom: 72px; }
.reading-article { min-width: 0; }
.reading-article section { scroll-margin-top: 100px; padding: 32px 0 12px; }
.reading-article h2 { font-size: clamp(24px, 2.2vw, 30px); line-height: 1.35; margin: 0 0 20px; }
.reading-article h3 { font-size: 20px; line-height: 1.45; margin: 30px 0 12px; }
.reading-article p, .reading-article li { max-width: 44em; }
.reading-article p { margin: 12px 0 20px; }
.reading-article a { color: var(--accent-strong); text-underline-offset: 4px; }
.reading-article li { padding-left: 4px; margin: 10px 0; }
.reading-article ol, .reading-article ul { padding-left: 23px; }
.reading-article .scope-note { background: var(--surface-soft); border-radius: var(--radius); padding: 20px 24px; margin: 16px 0 28px; }
.reading-article .scope-note p:last-child { margin-bottom: 0; }
.reading-article .source-note { color: var(--muted); font-size: 14px; }
.reading-article figure { margin: 28px 0; }
.reading-article figure img { width: 100%; border: 1px solid var(--line); border-radius: var(--radius); }
.reading-article figcaption { margin-top: 10px; color: var(--muted); font-size: 14px; }
.reading-aside { position: sticky; top: 108px; font-size: 14px; padding-top: 30px; }
.reading-aside strong { display: block; font-size: 16px; margin-bottom: 12px; }
.reading-aside nav { display: grid; gap: 12px; margin-bottom: 30px; }
.reading-aside a { text-decoration: none; color: var(--muted); padding-block: 4px; }
.reading-aside a:hover { color: var(--accent-strong); text-decoration: underline; }
.table-wrap { max-width: 100%; overflow-x: auto; margin: 22px 0; border: 1px solid var(--line); border-radius: var(--radius); }
.reading-article table { border-collapse: collapse; width: 100%; font-size: 15px; }
.reading-article th { background: var(--surface-soft); text-align: left; font-weight: 700; }
.reading-article th, .reading-article td { padding: 16px; vertical-align: top; line-height: 1.65; }
.reading-article tbody tr+tr { border-top: 1px solid var(--line); }
.reading-article caption { text-align: left; padding: 12px 16px; color: var(--muted); background: var(--surface); font-size: 14px; }
.fact-list { display: grid; grid-template-columns: 115px minmax(0,1fr); margin: 24px 0; }
.fact-list dt, .fact-list dd { margin: 0; padding: 13px 0; border-bottom: 1px solid var(--line); }
.fact-list dt { color: var(--muted); }
.guide-list { list-style: none; padding: 0 !important; margin: 0; }
.guide-list li { margin: 0; padding: 24px 0; border-bottom: 1px solid var(--line); }
.guide-list h2 { font-size: 24px; margin-bottom: 10px; }
.guide-list p { margin-bottom: 8px; }
.reading-footer .footer-shell { display: block; }
.reading-footer .footer-links { margin-top: 18px; }
.reading-article .button { color: var(--on-accent); margin-top: 10px; }
@media (max-width: 900px) {
  .reading-header .main-nav a:not(.button) { display: inline; }
  .reading-header .nav-shell { align-items: flex-start; flex-direction: column; gap: 12px; padding-block: 14px; }
  .reading-header .main-nav { gap: 14px; font-size: 13px; }
  .reading-layout { grid-template-columns: 1fr; gap: 0; }
  .reading-aside { position: static; grid-row: 1; padding: 0 0 24px; border-bottom: 1px solid var(--line); }
  .reading-aside nav { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-bottom: 0; }
  .reading-aside .related-nav { display: none; }
  .reading-intro { padding-top: 30px; }
  .reading-article section { scroll-margin-top: 140px; }
}
@media (max-width: 640px) {
  .reading-intro .lead { font-size: 17px; }
  .reading-article th, .reading-article td { padding: 12px; min-width: 110px; }
  .fact-list { grid-template-columns: 85px minmax(0,1fr); font-size: 15px; }
  .reading-article .scope-note { padding: 18px; }
}