:root {
  --bg: #f6f7f9; --card: #ffffff; --text: #1c2330; --muted: #64748b;
  --border: #e2e8f0; --accent: #2563eb;
  --ok: #2563eb; --bad: #dc2626; --base: #d97706; --ref: #94a3b8; --skip: #cbd5e1;
  --ok-bg: #eff6ff; --bad-bg: #fef2f2; --base-bg: #fffbeb;
  --code-bg: #eef1f5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141c; --card: #171e29; --text: #e5eaf2; --muted: #8b98ab;
    --border: #2a3441; --accent: #60a5fa;
    --ok: #60a5fa; --bad: #f87171; --base: #fbbf24; --ref: #64748b; --skip: #334155;
    --ok-bg: #1c2a44; --bad-bg: #3b1f24; --base-bg: #3a2e18;
    --code-bg: #101722;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 1000px; margin: 0 auto; padding: 1rem 1.25rem 4rem; }
header.hero { padding: 3rem 0 1rem; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 .5rem; }
h2 { font-size: 1.4rem; margin: 3rem 0 .75rem; padding-top: .5rem; border-top: 1px solid var(--border); }
h3 { font-size: 1.05rem; margin: 2rem 0 .25rem; }
p.lead { color: var(--muted); max-width: 46rem; margin-top: 0; }
p.hint { color: var(--muted); font-size: .85rem; margin: .35rem 0 0; }
a { color: var(--accent); }
code { background: var(--code-bg); padding: .1em .35em; border-radius: 4px; font-size: .875em; }
pre { background: var(--code-bg); padding: .9rem; border-radius: 8px; overflow-x: auto; font-size: .8rem; line-height: 1.5; }
pre code { background: none; padding: 0; }
table { border-collapse: collapse; width: 100%; font-size: .875rem; background: var(--card); border-radius: 8px; overflow: hidden; box-shadow: 0 1px 2px rgb(0 0 0 / .06); display: block; overflow-x: auto; white-space: nowrap; }
th, td { text-align: left; padding: .5rem .75rem; border-bottom: 1px solid var(--border); }
thead th { background: var(--code-bg); font-weight: 600; }
tbody tr:last-child td { border-bottom: none; }
td.ok { color: var(--ok); font-weight: 600; }
td.bad { color: var(--bad); font-weight: 600; }
td.num { text-align: right; font-variant-numeric: tabular-nums; }
td.muted { color: var(--muted); }
.badge { font-size: .68rem; font-weight: 600; padding: .12em .5em; border-radius: 99px; vertical-align: middle; white-space: nowrap; }
.badge.pass { background: var(--ok-bg); color: var(--ok); }
.badge.fail { background: var(--bad-bg); color: var(--bad); }
.badge.warn { background: var(--base-bg); color: var(--base); }
.badge.baseline { background: var(--code-bg); color: var(--muted); }
.chart .bar.warn { background: var(--base); }
.chart { background: var(--card); border-radius: 8px; padding: .9rem 1rem; box-shadow: 0 1px 2px rgb(0 0 0 / .06); }
.chart .row { display: grid; grid-template-columns: 15.5rem 1fr; gap: .75rem; align-items: center; padding: .18rem 0; }
.chart .row.dim { opacity: .55; }
.chart .label { font-size: .82rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chart .track { position: relative; display: flex; align-items: center; gap: .5rem; min-height: 1.1rem; }
.chart .bar { height: .85rem; border-radius: 3px; min-width: 2px; flex: none; }
.chart .bar.ok { background: var(--ok); }
.chart .bar.bad { background: var(--bad); }
.chart .bar.base { background: var(--base); }
.chart .bar.ref { background: var(--ref); }
.chart .bar.skip { background: var(--skip); }
.chart .value { font-size: .75rem; color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
details { margin: .6rem 0; }
details summary { cursor: pointer; color: var(--accent); font-size: .875rem; }
details ul { font-size: .85rem; }
details li { margin: .5rem 0; }
.zero-dep { color: var(--ok); font-weight: 600; }
.depth-grid td.depth { text-align: center; font-weight: 700; letter-spacing: .15em; white-space: nowrap; }
.depth-grid td.depth.pass { color: #16a34a; background: color-mix(in srgb, #16a34a 12%, transparent); }
.depth-grid td.depth.partial { color: var(--base); background: color-mix(in srgb, #d97706 14%, transparent); }
.depth-grid td.depth.fail { color: var(--bad); background: color-mix(in srgb, #dc2626 10%, transparent); }
table.filterable-rows tbody tr.hidden { display: none; }
details.deviation.hidden { display: none; }
.filter { display: flex; gap: .5rem; margin: .75rem 0 1.25rem; flex-wrap: wrap; }
.filter button {
  font: inherit; font-size: .82rem; padding: .3rem .9rem; border-radius: 99px;
  border: 1px solid var(--border); background: var(--card); color: var(--text); cursor: pointer;
}
.filter button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.row.hidden { display: none; }
.empty-note { color: var(--muted); font-size: .85rem; margin: .25rem 0; font-style: italic; }
nav.topnav {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.topnav-inner {
  max-width: 1000px; margin: 0 auto; padding: 0 1.25rem;
  display: flex; align-items: center; gap: 1.25rem;
  overflow-x: auto; scrollbar-width: none;
}
.topnav-inner::-webkit-scrollbar { display: none; }
.topnav .brand {
  font-weight: 700; font-size: .9rem; color: var(--text);
  text-decoration: none; white-space: nowrap; padding: .7rem 0;
}
.topnav .links { display: flex; gap: .25rem; }
.topnav .links a {
  color: var(--muted); text-decoration: none; font-size: .875rem;
  padding: .7rem .6rem; white-space: nowrap;
  border-bottom: 2px solid transparent;
}
.topnav .links a:hover { color: var(--text); }
.topnav .links a.active { color: var(--accent); border-bottom-color: var(--accent); }
.topnav .menu-toggle {
  display: none; margin-left: auto; font-size: 1.2rem; line-height: 1;
  padding: .45rem .6rem; border: 1px solid var(--border); border-radius: 6px;
  background: var(--card); color: var(--text); cursor: pointer;
}
.version-filter { position: relative; margin-left: auto; }
.version-toggle {
  font: inherit; font-size: .82rem; white-space: nowrap; cursor: pointer;
  padding: .4rem .7rem; border: 1px solid var(--border); border-radius: 6px;
  background: var(--card); color: var(--text);
}
.version-toggle .chev { font-size: .7em; margin-left: .15em; }
.version-filter.open .version-toggle { border-color: var(--accent); color: var(--accent); }
.version-panel {
  /* Fixed, not absolute: .topnav-inner sets overflow-x for the scrollable
     nav links, which per the CSS overflow spec forces overflow-y to "auto"
     too - an absolutely-positioned dropdown would be clipped by that. Fixed
     positioning escapes it; main.js sets top/right in pixels on open. */
  position: fixed; top: 0; right: 0; z-index: 1000;
  width: 15rem; max-height: 60vh; overflow-y: auto;
  background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  box-shadow: 0 8px 20px rgb(0 0 0 / .15); padding: .75rem;
}
.version-panel[hidden] { display: none; }
.version-panel-title { font-size: .78rem; color: var(--muted); margin: 0 0 .5rem; }
.version-options { display: flex; flex-direction: column; gap: .25rem; margin-bottom: .6rem; }
.version-options label { display: flex; align-items: center; gap: .5rem; font-size: .85rem; cursor: pointer; }
.version-panel-actions { display: flex; gap: .5rem; border-top: 1px solid var(--border); padding-top: .55rem; }
.version-panel-actions button {
  flex: 1; font: inherit; font-size: .75rem; padding: .35rem .5rem; cursor: pointer;
  border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--text);
}
@media (max-width: 640px) {
  .version-filter { margin-left: 0; order: 3; }
}
h2[id], h3[id] { scroll-margin-top: 3.6rem; }
@media (max-width: 640px) {
  /* position:sticky is unreliable on some mobile browsers once the dropdown
     styles apply, so pin the bar with fixed positioning and offset the body. */
  nav.topnav { position: fixed; top: 0; left: 0; right: 0; }
  body { padding-top: 3rem; }
  .topnav-inner { overflow: visible; justify-content: space-between; min-height: 3rem; }
  .topnav .menu-toggle { display: block; }
  .topnav .links {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 0; padding: .25rem 1.25rem .5rem;
    background: var(--card); border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 16px rgb(0 0 0 / .12);
  }
  .topnav.open .links { display: flex; }
  .topnav .links a { padding: .65rem 0; border-bottom: 1px solid var(--border); font-size: .95rem; }
  .topnav .links a:last-child { border-bottom: none; }
  .topnav .links a.active { border-bottom-color: var(--border); }
}
footer { margin-top: 4rem; padding-top: 1rem; border-top: 1px solid var(--border); color: var(--muted); font-size: .8rem; }
@media (max-width: 640px) {
  .chart .row { grid-template-columns: 1fr; gap: .1rem; padding: .35rem 0; }
}