:root {
  --bg: #ffffff;
  --fg: #1b1f24;
  --muted: #59636e;
  --border: #d1d9e0;
  --surface: #f6f8fa;
  --link: #0a58ca;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #9198a1;
    --border: #3d444d;
    --surface: #151b23;
    --link: #58a6ff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0 auto;
  max-width: 60rem;
  padding: 1.5rem 1rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--link); }
header nav { font-size: 0.9rem; margin-bottom: 1rem; }
h1 { margin: 0 0 0.5rem; line-height: 1.2; }
h2 { margin: 0 0 0.25rem; font-size: 1.25rem; }
main > h2 { margin-top: 2rem; }
h1 a, h2 a { color: inherit; text-decoration: none; }
code, pre { font: 0.875rem/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; }
pre {
  overflow-x: auto;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.muted, .meta { color: var(--muted); }
.meta { margin: 0 0 0.5rem; font-size: 0.9rem; }
.hash { overflow-wrap: anywhere; }
.example { border-top: 1px solid var(--border); padding-top: 1.5rem; margin-top: 1.5rem; }
dl { display: grid; grid-template-columns: max-content 1fr; gap: 0.25rem 1rem; }
dt { color: var(--muted); }
dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 40rem) {
  dl { grid-template-columns: 1fr; }
  dd { margin-bottom: 0.5rem; }
}
summary { cursor: pointer; color: var(--muted); }
.cards { list-style: none; padding: 0; display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); }
.cards a {
  display: block; height: 100%; padding: 1rem;
  border: 1px solid var(--border); border-radius: 8px;
  text-decoration: none; color: inherit;
}
.cards a:hover { border-color: var(--link); }
.cards span { display: block; color: var(--muted); margin-top: 0.25rem; }
.spec-form { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-top: 1.25rem; }
.spec-form label { font-weight: 600; }
.spec-form input {
  flex: 1 1 20rem; min-width: 0; padding: 0.4rem 0.6rem;
  font: 0.9rem ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--fg); background: var(--surface);
  border: 1px solid var(--border); border-radius: 6px;
}
.spec-form button {
  padding: 0.4rem 0.9rem; font: inherit; cursor: pointer;
  color: var(--fg); background: var(--surface);
  border: 1px solid var(--border); border-radius: 6px;
}
.spec-form button:hover { border-color: var(--link); }
.status { overflow-wrap: anywhere; }
.status.error { color: #cf222e; }
@media (prefers-color-scheme: dark) { .status.error { color: #ff7b72; } }

/* /diff/ (experimental) */
:root {
  --add-bg: #e6ffec; --add-mark: #abf2bc; --add-fg: #116329;
  --del-bg: #ffebe9; --del-mark: #ffcecb; --del-fg: #a40e26;
  --chg-bg: #fff8c5; --chg-fg: #7d4e00;
}
@media (prefers-color-scheme: dark) {
  :root {
    --add-bg: #12261e; --add-mark: #1f6f3c; --add-fg: #56d364;
    --del-bg: #2d1214; --del-mark: #8e1b24; --del-fg: #ff8182;
    --chg-bg: #2e2410; --chg-fg: #e3b341;
  }
}
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.diff-form { display: grid; grid-template-columns: max-content 1fr; }
.diff-form input { width: 100%; }
.diff-buttons { grid-column: 1 / -1; display: flex; gap: 0.5rem; justify-content: flex-end; }
.diff-options { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; margin: 0.75rem 0 0; padding: 0; border: 0; font-size: 0.9rem; }
.diff-options .option-group { display: inline-flex; gap: 0.75rem; }
.diff-options label { cursor: pointer; white-space: nowrap; }
.badge {
  display: inline-block; padding: 0 0.45rem; border-radius: 999px;
  font-size: 0.75rem; font-weight: 600; line-height: 1.6; vertical-align: 0.15em;
  border: 1px solid var(--border); color: var(--muted); white-space: nowrap;
}
.badge.added { background: var(--add-bg); color: var(--add-fg); border-color: transparent; }
.badge.removed { background: var(--del-bg); color: var(--del-fg); border-color: transparent; }
.badge.changed, .badge.experimental { background: var(--chg-bg); color: var(--chg-fg); border-color: transparent; }
.badge.moved { border-style: dashed; }
h1 .badge { font-size: 0.8rem; vertical-align: middle; }
.diff-summary { margin: 1.5rem 0 0.5rem; }
.diff-toc li { margin: 0.15rem 0; }
.stat-add { color: var(--add-fg); font: 0.8rem ui-monospace, SFMono-Regular, Menlo, monospace; }
.stat-remove { color: var(--del-fg); font: 0.8rem ui-monospace, SFMono-Regular, Menlo, monospace; }
.diff-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); }
table.diff { border-collapse: collapse; width: 100%; font: 0.8125rem/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; }
table.diff td { padding: 0 0.5rem; vertical-align: top; }
table.diff td.ln {
  width: 1%; min-width: 2.5rem; text-align: right; color: var(--muted);
  user-select: none; border-right: 1px solid var(--border);
}
table.diff td.sign { width: 1%; padding-right: 0; user-select: none; color: var(--muted); }
table.diff td.code { white-space: pre; }
table.diff tr.ins { background: var(--add-bg); }
table.diff tr.del { background: var(--del-bg); }
table.diff tr.ins td.sign { color: var(--add-fg); }
table.diff tr.del td.sign { color: var(--del-fg); }
table.diff tr.ins mark { background: var(--add-mark); color: inherit; border-radius: 2px; }
table.diff tr.del mark { background: var(--del-mark); color: inherit; border-radius: 2px; }
table.diff tr.gap td { color: var(--muted); padding: 0.15rem 0.5rem; font-style: italic; border-block: 1px solid var(--border); }
@media (max-width: 40rem) {
  .diff-form { grid-template-columns: 1fr; }
}