:root {
  --bg: #0e1116;
  --panel: #161b22;
  --panel-2: #1c2230;
  --line: #2a3240;
  --txt: #e6edf3;
  --muted: #8b96a5;
  --accent: #3fb950;
  --accent-2: #58a6ff;
  --warn: #d29922;
  --danger: #f85149;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--txt);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.hidden { display: none !important; }

.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px 24px;
  flex-wrap: wrap;
  padding: 14px 22px; background: var(--panel); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 12px; min-width: 0; }
.brand h1 { font-size: 18px; margin: 0; letter-spacing: .2px; }
.brand .src { color: var(--muted); font-size: 12px; }
.brand .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 3px rgba(63,185,80,.18); align-self: center; flex: none; }

.nav { display: flex; gap: 4px; }
.nav a { color: var(--muted); text-decoration: none; font-size: 13px; font-weight: 600;
  padding: 6px 12px; border-radius: 8px; }
.nav a:hover { color: var(--txt); background: var(--panel-2); }
.nav a.active { color: var(--accent-2); background: rgba(88,166,255,.14); }

.meter { display: flex; align-items: center; flex-wrap: wrap; gap: 12px 18px; }
.meter-cell { display: flex; flex-direction: column; align-items: flex-end; }
.meter-cell label { color: var(--muted); font-size: 10px; text-transform: uppercase; letter-spacing: .6px; }
.meter-cell strong { font-family: var(--mono); font-size: 14px; }
.meter-bar { width: 120px; height: 6px; background: var(--panel-2); border-radius: 4px; overflow: hidden; }
.meter-bar span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .3s; }

.banner { background: rgba(139,150,165,.08); color: var(--muted); border-bottom: 1px solid var(--line);
  padding: 7px 22px; font-size: 12px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.banner b { color: var(--txt); font-weight: 600; }
.banner-tag { font-family: var(--mono); font-size: 10px; font-weight: 700; letter-spacing: .6px;
  color: var(--warn); background: rgba(210,153,34,.14); border: 1px solid rgba(210,153,34,.3);
  padding: 1px 7px; border-radius: 999px; }
.banner code, .foot code { font-family: var(--mono); background: rgba(255,255,255,.06); padding: 1px 5px; border-radius: 4px; }
.alert { background: rgba(248,81,73,.12); color: #ffb3ae; border-bottom: 1px solid rgba(248,81,73,.35);
  padding: 8px 22px; font-size: 13px; }

main { max-width: 1180px; margin: 0 auto; padding: 22px; }

.controls { display: flex; gap: 14px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.grow { flex: 1; }
.field label { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: .5px; }
select, button {
  background: var(--panel-2); color: var(--txt); border: 1px solid var(--line);
  border-radius: 8px; padding: 9px 12px; font-size: 14px; min-width: 220px;
}
button {
  min-width: 150px; cursor: pointer; font-weight: 600; background: var(--accent-2);
  color: #06101f; border-color: transparent; transition: opacity .15s;
}
button:disabled { opacity: .45; cursor: not-allowed; }

.summary { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 18px; }
.metric { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.metric label { display: block; color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: .5px; }
.metric strong { font-size: 20px; font-family: var(--mono); }
.metric small { color: var(--muted); }

.models-toggle { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.models-toggle .lbl { color: var(--muted); font-size: 12px; }
.chip { font-size: 12px; padding: 5px 11px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line); background: var(--panel-2); color: var(--muted); user-select: none; }
.chip.on { background: rgba(88,166,255,.16); border-color: var(--accent-2); color: var(--accent-2); }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
thead th { background: var(--panel); color: var(--muted); font-weight: 600; text-align: right;
  padding: 9px 12px; border-bottom: 1px solid var(--line); white-space: nowrap; position: sticky; top: 0; }
thead th.grp { text-align: center; border-left: 1px solid var(--line); color: var(--txt); font-size: 11px;
  text-transform: uppercase; letter-spacing: .5px; }
thead tr.sub th { font-weight: 500; font-size: 11px; }
th.dog, td.dog { text-align: left; position: sticky; left: 0; background: var(--panel); }
tbody td { padding: 8px 12px; text-align: right; border-bottom: 1px solid var(--line); font-family: var(--mono); }
tbody tr:hover td { background: rgba(255,255,255,.02); }
tbody tr:hover td.dog { background: var(--panel-2); }
td.sep, th.sep { border-left: 1px solid var(--line); }
.muted { color: var(--muted); }
.pos { color: var(--accent); }
.neg { color: var(--danger); }
.empty { color: var(--muted); padding: 26px; text-align: center; }
.foot { color: var(--muted); font-size: 12px; margin-top: 16px; }

/* Methods explainer page */
.prose { max-width: 820px; margin: 0 auto; padding: 28px 22px 60px; }
.prose h2 { font-size: 22px; margin: 0 0 6px; }
.prose h3 { font-size: 16px; margin: 30px 0 8px; display: flex; align-items: baseline; gap: 10px; }
.prose h3 .tag { font-size: 11px; font-weight: 600; color: var(--accent-2);
  background: rgba(88,166,255,.14); padding: 2px 8px; border-radius: 999px; }
.prose .lead { color: var(--muted); font-size: 15px; margin-bottom: 8px; }
.prose p { color: var(--txt); }
.prose .muted { color: var(--muted); }
.prose .formula { font-family: var(--mono); background: var(--panel); border: 1px solid var(--line);
  border-left: 3px solid var(--accent-2); border-radius: 8px; padding: 12px 14px; margin: 10px 0;
  font-size: 13px; overflow-x: auto; white-space: pre-wrap; }
.prose .callout { background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 14px 16px; margin: 16px 0; }
.prose .callout.warn { border-color: rgba(210,153,34,.4); background: rgba(210,153,34,.08); }
.prose ul { padding-left: 20px; }
.prose li { margin: 4px 0; }
.prose code { font-family: var(--mono); background: rgba(255,255,255,.06); padding: 1px 5px; border-radius: 4px; font-size: 12.5px; }
.rank-table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 13px; }
.rank-table th, .rank-table td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--line); }
.rank-table th { color: var(--muted); font-weight: 600; }
.rank-table td.mono { font-family: var(--mono); }

/* ---- Responsive: collapse the header cleanly on narrow screens ---- */
@media (max-width: 640px) {
  .topbar {
    flex-direction: column; align-items: stretch; gap: 10px; padding: 12px 16px;
  }
  .brand { align-items: center; }
  .brand h1 { font-size: 16px; }
  .brand .src { flex-basis: 100%; font-size: 11px; line-height: 1.35; }
  .nav { order: 3; }
  .meter {
    order: 2; gap: 8px 14px; padding-top: 8px; border-top: 1px solid var(--line);
  }
  .meter-cell { align-items: flex-start; }
  .meter-cell strong { font-size: 13px; }
  .meter-bar { width: 100%; flex-basis: 100%; order: 9; }
  .banner { padding: 7px 16px; }
  main { padding: 16px; }
  select, button { min-width: 0; width: 100%; }
  .field { width: 100%; }
  .summary { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 380px) {
  .brand h1 { font-size: 15px; }
  .meter-cell label { font-size: 9px; }
}