:root {
  --bg: #ffffff;
  --text: #1f2023;
  --muted: #62666d;
  --line: #d9d9d6;
  --bar: #ededea;
  --accent: #2b6a37;
  --link: #1a5fb4;
  --hover: #f4f7fb;
  --flash: #fff3c4;
  --tag-ink: #ffffff;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141517;
    --text: #e8e8e9;
    --muted: #a2a6ad;
    --line: #34363b;
    --bar: #222428;
    --accent: #7cc489;
    --link: #8ab4f8;
    --hover: #1c1f24;
    --flash: #3b3520;
    --tag-ink: #10140f;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #141517;
  --text: #e8e8e9;
  --muted: #a2a6ad;
  --line: #34363b;
  --bar: #222428;
  --accent: #7cc489;
  --link: #8ab4f8;
  --hover: #1c1f24;
  --flash: #3b3520;
  --tag-ink: #10140f;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { margin: 0; line-height: 1.25; font-weight: 600; }
p { margin: 0; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; background: var(--bg); padding: 8px 12px; z-index: 10; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; }

.draft { background: var(--bar); color: var(--muted); font-size: 0.8rem; text-align: center; padding: 4px 16px; }

/* ── Top bar ── */
.top { border-bottom: 2px solid var(--accent); }
.top-inner {
  max-width: 1200px; margin: 0 auto; padding: 12px 16px;
  display: flex; align-items: center; gap: 12px 24px; flex-wrap: wrap;
}
.brand { font-weight: 800; font-size: 1.3rem; color: var(--accent); letter-spacing: -0.01em; }
.brand:hover { text-decoration: none; }
.search { flex: 1 1 320px; max-width: 560px; }
.search input {
  width: 100%; font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--line); border-radius: 3px; padding: 8px 10px;
}
.search input:focus { outline: 2px solid var(--link); border-color: transparent; }
.top-link { margin-left: auto; font-size: 0.9rem; }

/* ── Sidebar + main ── */
.shell {
  max-width: 1200px; margin: 0 auto; padding: 0 16px;
  display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 28px;
}
#side { padding: 18px 0 40px; border-right: 1px solid var(--line); }
.side-toggle { display: none; }
.side-body { position: sticky; top: 12px; padding-right: 16px; }
.side-title { font-weight: 700; font-size: 0.95rem; padding-bottom: 6px; border-bottom: 1px solid var(--line); margin-bottom: 6px; }
.side-title a { color: var(--text); }
.side-list { list-style: none; margin: 0 0 18px; padding: 0; }
.side-list a { display: block; padding: 4px 0; font-size: 0.88rem; color: var(--text); line-height: 1.35; }
.side-list a:hover { color: var(--link); text-decoration: none; }
.side-list a[aria-current="page"] { color: var(--accent); font-weight: 700; }
.side-list .code { color: var(--muted); font-size: 0.8rem; margin-right: 4px; }
.side-back { display: inline-block; font-size: 0.85rem; margin-bottom: 12px; }

main { padding: 18px 0 56px; outline: none; min-width: 0; }

@media (max-width: 760px) {
  .shell { grid-template-columns: 1fr; gap: 0; }
  #side { border-right: 0; border-bottom: 1px solid var(--line); padding: 8px 0; }
  .side-toggle {
    display: flex; width: 100%; justify-content: space-between; align-items: center;
    font: inherit; font-weight: 600; color: var(--text); background: none; border: 0; padding: 6px 0; cursor: pointer;
  }
  .side-toggle::after { content: "▾"; color: var(--muted); }
  #side.open .side-toggle::after { content: "▴"; }
  .side-body { display: none; position: static; padding: 8px 0 0; }
  #side.open .side-body { display: block; }
  .top-link { margin-left: 0; }
}

/* ── Page heads ── */
.crumbs {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  font-size: 0.85rem; color: var(--muted); padding-bottom: 6px; border-bottom: 1px solid var(--line); margin-bottom: 10px;
}
.crumbs nav span[aria-hidden] { margin: 0 6px; }
h1 { font-size: 1.5rem; color: var(--accent); font-weight: 600; }
.sub { color: var(--muted); font-size: 0.9rem; margin-top: 2px; }
.now-line { margin-top: 10px; font-size: 0.95rem; }
.tag {
  display: inline-block; font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em;
  background: var(--accent); color: var(--tag-ink); padding: 1px 6px; border-radius: 2px; vertical-align: 2px; margin-left: 6px;
}
.muted { color: var(--muted); }
.todo { color: var(--muted); font-style: italic; }

/* ── Sections ── */
.section { margin-top: 22px; }
.bar { background: var(--bar); font-weight: 600; font-size: 0.95rem; padding: 5px 10px; margin-bottom: 4px; }
.hint { color: var(--muted); font-size: 0.85rem; padding: 4px 10px 8px; }

/* Home: every class with its units */
.cat { margin-top: 22px; }
.cat h2 { font-size: 1.2rem; }
.cat h2 a { color: var(--accent); }
.cat h2 .sub { display: inline; margin-left: 8px; font-weight: 400; }
.unit-links { list-style: none; margin: 8px 0 0; padding: 0; columns: 2 260px; column-gap: 32px; }
.unit-links li { break-inside: avoid; padding: 3px 0; font-size: 0.92rem; }
.unit-links .code { color: var(--muted); display: inline-block; min-width: 58px; }

/* ── Tables ── */
.spec { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.spec th {
  text-align: left; font-weight: 500; color: var(--muted); font-size: 0.8rem;
  padding: 4px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; vertical-align: bottom;
}
.spec td { padding: 6px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.spec tbody tr:hover { background: var(--hover); }
.spec tr.flash { background: var(--flash); }
.spec .link-col { white-space: nowrap; width: 1%; text-align: center; }
.spec th.link-col { text-align: center; }
.spec .code-col { white-space: nowrap; width: 1%; color: var(--muted); }
.spec .key a::before { content: "✓ "; color: var(--muted); }
.spec .soon { color: var(--muted); font-size: 0.8rem; }
.spec .na { color: var(--line); }
.spec .t { font-weight: 500; }
.spec .ican { color: var(--muted); font-size: 0.82rem; margin-top: 2px; }
.spec .ican li { margin: 1px 0; }
.spec .ican ul { margin: 0; padding-left: 16px; }
.spec a.row-link { color: var(--text); font-weight: 500; }
.spec a.row-link:hover { color: var(--link); }
.spec .when { white-space: nowrap; color: var(--muted); width: 1%; }
.spec .when.soonest { color: var(--accent); font-weight: 600; }

@media (max-width: 760px) {
  .spec thead { display: none; }
  .spec, .spec tbody, .spec tr { display: block; width: 100%; }
  .spec tr { border-bottom: 1px solid var(--line); padding: 8px 2px; }
  .spec td { display: inline-block; border: 0; padding: 2px 14px 2px 0; }
  .spec td.link-col { width: auto; text-align: left; }
  .spec td.main-col { display: block; }
  .spec .code-col, .spec .when { display: block; width: auto; }
  .spec td.na { display: none; }
  .spec td.link-col[data-label]::before { content: attr(data-label) " "; color: var(--muted); font-size: 0.8rem; }
  .spec .key a::before { content: ""; }
}

.pager { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 24px; font-size: 0.9rem; }

/* About */
.prose { max-width: 680px; }
.prose p, .prose li { font-size: 0.95rem; }
.prose ol, .prose ul { margin: 4px 0 0; padding-left: 22px; }
.prose li + li { margin-top: 3px; }
.prose .bar { margin-top: 20px; }

/* Footer */
.foot { border-top: 1px solid var(--line); }
.foot-inner {
  max-width: 1200px; margin: 0 auto; padding: 10px 16px 24px;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 20px; font-size: 0.82rem; color: var(--muted);
}
.foot a { color: var(--muted); }