:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #5a6475;
  --line: #d8dee8;
  --surface: #f7f9fc;
  --accent: #165d8a;
  --accent-dark: #0f466b;
  --note: #eef5fb;
  --font-text: -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-underline-offset: .18em; }
a:hover { color: var(--accent-dark); }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 3px solid #58a6d9;
  outline-offset: 3px;
}
h1, h2, h3, h4 {
  color: #111827;
  font-family: var(--font-display);
  line-height: 1.2;
  letter-spacing: -.025em;
}
h1 { font-size: clamp(2.1rem, 5vw, 3.5rem); max-width: 18ch; margin: .25rem 0 1rem; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin: 2rem 0 .8rem; }
h3 { font-size: 1.2rem; margin: 0 0 1rem; }
h4 { font-size: 1.12rem; margin: .25rem 0 .65rem; }
p { margin: 0 0 1rem; }
ul, ol { padding-left: 1.4rem; margin: .5rem 0 1.25rem; }
li { padding-left: .2rem; margin: .35rem 0; }
.site-header { border-bottom: 1px solid var(--line); background: #fff; }
.header-inner, .footer-inner, .page-wrap { width: min(100% - 2rem, 62rem); margin-inline: auto; }
.header-inner { min-height: 4.25rem; display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.wordmark { color: var(--ink); font-weight: 700; text-decoration: none; letter-spacing: -.02em; }
nav[aria-label="Main navigation"] { display: flex; gap: 1.15rem; }
nav[aria-label="Main navigation"] a { color: var(--muted); text-decoration: none; font-size: .95rem; }
nav[aria-label="Main navigation"] a:hover { color: var(--ink); text-decoration: underline; }
.skip-link { position: absolute; left: -9999px; top: 0; z-index: 20; padding: .75rem 1rem; background: #fff; }
.skip-link:focus { left: 1rem; top: 1rem; }
.hero { padding-block: clamp(3rem, 8vw, 6.25rem); }
.hero .lead { max-width: 48rem; }
.lead { color: #3e4a5d; font-size: clamp(1.12rem, 2.2vw, 1.35rem); line-height: 1.55; }
.eyebrow { color: var(--accent); font-size: .78rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; margin-bottom: .4rem; }
.small, .updated, .search-help { color: var(--muted); font-size: .88rem; }
.updated { margin: .8rem 0 1rem; }
.hero-links { display: flex; flex-wrap: wrap; gap: .75rem 1.25rem; margin-top: 1.35rem; }
.search-box { padding: 1.2rem; margin: 1.4rem 0 1.8rem; background: var(--surface); border: 1px solid var(--line); border-radius: .75rem; }
.search-box label { display: block; font-weight: 650; margin-bottom: .45rem; }
.search-row { display: flex; gap: .6rem; }
.search-row input { flex: 1; min-width: 0; padding: .72rem .85rem; border: 1px solid #aab5c4; border-radius: .45rem; background: #fff; color: var(--ink); font: inherit; }
.search-row button { padding: .7rem 1rem; border: 0; border-radius: .45rem; background: var(--accent); color: #fff; font: inherit; font-weight: 650; cursor: pointer; }
.search-row button:hover { background: var(--accent-dark); }
.search-help { margin: .55rem 0 0; }
.section-intro { max-width: 48rem; margin-bottom: 2rem; }
.guide-group { padding-block: 1.5rem 2rem; border-top: 1px solid var(--line); }
.card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.guide-card { display: flex; flex-direction: column; align-items: flex-start; padding: 1.15rem; border: 1px solid var(--line); border-radius: .7rem; background: #fff; }
.guide-card p:not(.eyebrow) { color: var(--muted); margin-bottom: 1rem; }
.guide-card h4 a { color: var(--ink); text-decoration: none; }
.guide-card h4 a:hover { color: var(--accent); text-decoration: underline; }
.card-link { margin-top: auto; font-weight: 650; text-decoration: none; }
.method-band { margin-top: 2.5rem; padding-block: 1rem 2.5rem; background: var(--surface); border-block: 1px solid var(--line); }
.method-band h2 { margin-top: 1.6rem; }
.page-wrap { padding-block: 2.2rem 4rem; }
.breadcrumbs { display: flex; flex-wrap: wrap; align-items: center; gap: .55rem; margin-bottom: 1.4rem; color: var(--muted); font-size: .9rem; }
.breadcrumbs a { text-decoration: none; }
.article-header { border-bottom: 1px solid var(--line); padding-bottom: 1.25rem; }
.article-header .lead { max-width: 52rem; }
.tags { display: flex; flex-wrap: wrap; gap: .45rem; margin: .75rem 0 .25rem; }
.tag { padding: .2rem .55rem; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: .78rem; }
.article-content { max-width: 52rem; }
.article-section { margin: 2rem 0; }
.article-section h2 { margin-top: 0; }
.note { margin: 1.1rem 0; padding: .9rem 1rem; border-left: 4px solid var(--accent); background: var(--note); color: #27384a; }
.note-wide { margin-top: 2rem; }
.references { margin: 2rem 0; padding-top: 1rem; border-top: 1px solid var(--line); }
.references h2 { margin-top: .5rem; }
.source-list li { margin-block: .55rem; }
.search-results { display: grid; gap: .85rem; max-width: 52rem; }
.result-card { padding: 1rem; border: 1px solid var(--line); border-radius: .6rem; }
.result-card h2 { margin: .25rem 0 .45rem; font-size: 1.15rem; }
.result-card h2 a { color: var(--ink); text-decoration: none; }
.result-card h2 a:hover { color: var(--accent); text-decoration: underline; }
.result-card p { margin-bottom: .35rem; }
.result-category { color: var(--accent); font-size: .78rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
.search-status { color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); background: var(--surface); }
.footer-inner { padding-block: 1.4rem 2rem; }
.footer-inner p { margin-bottom: .45rem; }
.footer-inner a { margin-right: 1rem; }
.footer-inner .small { max-width: 48rem; }
@media (max-width: 640px) {
  .header-inner { align-items: flex-start; flex-direction: column; justify-content: center; padding-block: .8rem; }
  .card-grid { grid-template-columns: 1fr; }
  .search-row { flex-direction: column; }
  .search-row button { align-self: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}