:root {
  --bg: #fbfaf7;
  --fg: #1c1b19;
  --muted: #5f5b54;
  --line: #d9d4ca;
  --accent: #b3202c;
  --on-accent: #ffffff;
  --ok: #1f6b3a;
  --bad: #9b1c1c;
  --card: #ffffff;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141312;
    --fg: #f1eee8;
    --muted: #b3ada3;
    --line: #37332e;
    --accent: #e0515c;
    --on-accent: #141312;
    --ok: #57c27c;
    --bad: #f07a7a;
    --card: #1d1c1a;
  }
}
* { box-sizing: border-box; }
/* `display: block` on labels would otherwise beat the hidden attribute (found in the browser check). */
[hidden] { display: none !important; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
}
main { max-width: 560px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.6rem; margin: 0.2rem 0; }
h2 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin: 1.5rem 0 0.5rem; }
.promise { color: var(--muted); margin: 0; }
section { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px 16px; margin-top: 14px; }
section h2 { margin-top: 0.2rem; }
label { display: block; font-size: 0.9rem; color: var(--muted); }
label.inline { display: flex; gap: 8px; align-items: center; margin-top: 8px; }
input[type="number"], select, textarea {
  display: block; width: 100%; margin-top: 4px; padding: 10px 12px;
  font: inherit; color: var(--fg); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px;
}
input[type="number"] { font-size: 1.3rem; font-variant-numeric: tabular-nums; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 12px; }
.rule { margin: 10px 0 4px; font-weight: 600; }
.sources { margin: 0; font-size: 0.8rem; color: var(--muted); }
.line { display: block; margin-top: 12px; padding: 12px; border-radius: 8px; background: var(--bg); border: 1px dashed var(--line); font-size: 1.15rem; font-weight: 600; font-variant-numeric: tabular-nums; }
button {
  margin-top: 12px; width: 100%; padding: 14px; font: inherit; font-weight: 700; font-size: 1.1rem;
  color: var(--on-accent); background: var(--accent); border: 0; border-radius: 10px; cursor: pointer;
}
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.result { margin-top: 14px; }
.headline { font-size: 2rem; font-weight: 800; margin: 0; }
.headline.pass { color: var(--ok); }
.headline.fail { color: var(--bad); }
.headline.neutral { color: var(--fg); }
.room { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 14px 20px; margin-top: 14px; }
.actions { display: grid; gap: 10px; margin-top: 14px; }
.actions button { margin-top: 0; }
#runoff-next { background: var(--card); color: var(--fg); border: 1px solid var(--line); }
input[type="text"] { display: block; width: 100%; margin-top: 4px; padding: 10px 12px; font: inherit; font-size: 1.3rem; font-variant-numeric: tabular-nums; color: var(--fg); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.result ul { margin: 6px 0 0; padding-left: 1.1rem; }
.error { color: var(--bad); font-weight: 600; }
footer { color: var(--muted); font-size: 0.85rem; margin: 18px 2px 40px; }
@media (max-width: 380px) { .grid { grid-template-columns: 1fr; } }