:root {
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --page: #f4f5f6;
  --paper: #fff;
  --ink: #17181a;
  --ink-body: #3c4046;
  --ink-2: #6b6f76;
  --ink-3: #8a8f96;
  --line: #e8eaec;
  --accent: #1d4a63;
  --accent-tint: #edf2f5;
  --accent-line: #c3d2db;
  --sand: #7a5b21;
  --sand-bg: #f7f0dd;
  --alert: #a54131;
  --alert-bg: #fff2ef;
  --ok: #266b4c;
  --ok-bg: #edf8f2;
  color-scheme: light;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

a:hover { text-decoration-thickness: 2px; }

a:focus-visible {
  outline: 3px solid var(--accent-line);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 8px;
  left: 8px;
  padding: 9px 12px;
  border-radius: 9px;
  background: var(--ink);
  color: #fff;
  transform: translateY(-150%);
}

.skip-link:focus { transform: none; }

.page {
  width: min(100%, 680px);
  min-height: 100vh;
  margin: 0 auto;
  border-inline: 1px solid var(--line);
  background: var(--paper);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: max(16px, env(safe-area-inset-top)) 20px 10px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 800;
  text-decoration: none;
}

.brand img { width: 32px; height: 32px; }

.back {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-body);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

main { padding: 12px 20px 54px; }

.hero {
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 7px;
  color: var(--accent);
  font: 700 11px/1.3 var(--font-ui);
  letter-spacing: .1em;
  text-transform: uppercase;
}

h1 {
  max-width: 19ch;
  margin: 0;
  font-size: clamp(29px, 8vw, 39px);
  line-height: 1.04;
  letter-spacing: -.035em;
  text-wrap: balance;
}

.lead {
  max-width: 56ch;
  margin: 14px 0 0;
  color: var(--ink-body);
  font-size: 15px;
  line-height: 1.58;
}

.meta {
  margin: 10px 0 0;
  color: var(--ink-3);
  font: 11.5px/1.5 var(--font-mono);
}

.notice {
  margin: 16px 0 0;
  padding: 13px 14px;
  border: 1px solid var(--accent-line);
  border-radius: 13px;
  background: var(--accent-tint);
  color: var(--ink-body);
  font-size: 13px;
  line-height: 1.5;
}

.notice strong { color: var(--ink); }
.notice.warning { border-color: #e5ce95; background: var(--sand-bg); }
.notice.danger { border-color: #efc4bb; background: var(--alert-bg); }
.notice.success { border-color: #bddfcf; background: var(--ok-bg); }

.toc {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 20px 0 6px;
}

.toc a {
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 11px;
  color: var(--ink-body);
  font-size: 12.5px;
  font-weight: 700;
  line-height: 1.3;
  text-decoration: none;
}

.doc-section {
  padding-top: 28px;
  scroll-margin-top: 10px;
}

.doc-section + .doc-section {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

h2 {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.16;
  letter-spacing: -.018em;
  text-wrap: balance;
}

h3 {
  margin: 22px 0 7px;
  font-size: 15px;
  line-height: 1.3;
}

p, li, dd, dt {
  color: var(--ink-body);
  font-size: 13.5px;
  line-height: 1.62;
}

p { margin: 8px 0; }
ul, ol { margin: 8px 0; padding-left: 21px; }
li + li { margin-top: 5px; }

dl {
  display: grid;
  grid-template-columns: minmax(120px, .7fr) minmax(0, 1.6fr);
  margin: 10px 0;
  border-top: 1px solid var(--line);
}

dt, dd {
  margin: 0;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

dt { padding-right: 14px; font-weight: 750; color: var(--ink); }

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin: 14px 0;
}

.card {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper);
}

.card .num {
  display: block;
  margin-bottom: 8px;
  color: var(--ink-3);
  font: 600 10px/1 var(--font-mono);
}

.card h3 { margin: 0 0 5px; }
.card p { margin: 0; font-size: 12.5px; }

.table-wrap { margin: 12px 0; overflow-x: auto; }

table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  border: 1px solid var(--line);
  font-size: 12.5px;
}

th, td {
  padding: 10px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-body);
  line-height: 1.48;
  text-align: left;
  vertical-align: top;
}

th { background: var(--accent-tint); color: var(--ink); font-weight: 750; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 47px;
  margin-top: 11px;
  padding: 0 17px;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
}

.button.secondary {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.sources {
  padding: 12px 14px;
  border-radius: 13px;
  background: var(--page);
}

.sources p, .sources li { font-size: 12px; }

.mono { font-family: var(--font-mono); }

footer {
  padding: 19px 20px calc(26px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 12px;
  line-height: 1.6;
}

.footer-links { display: flex; flex-wrap: wrap; gap: 7px 15px; margin-bottom: 8px; }
.footer-links a { color: var(--ink-2); }

@media (max-width: 480px) {
  .page { border-inline: 0; }
  .topbar { padding-inline: 16px; }
  main, footer { padding-inline: 16px; }
  .toc, .cards { grid-template-columns: 1fr; }
  dl { grid-template-columns: 1fr; }
  dt { padding-bottom: 0; border-bottom: 0; }
  dd { padding-top: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

@media print {
  :root { --page: #fff; }
  .page { width: 100%; border: 0; }
  .topbar, .toc, footer, .skip-link { display: none; }
  main { padding: 0; }
  a { color: inherit; }
  .doc-section { break-inside: avoid; }
}