:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #14161f;
  --muted: #5b6075;
  --border: #dfe2ec;
  --primary: #4f46e5;
  --primary-text: #ffffff;
  --ok: #15803d;
  --bad: #b91c1c;
  --a0: #e11d48;
  --a1: #2563eb;
  --a2: #a16207;
  --a3: #16a34a;
  --shadow: 0 1px 2px rgb(20 22 31 / 6%), 0 8px 24px rgb(20 22 31 / 6%);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1018;
    --surface: #171a26;
    --text: #eef0f8;
    --muted: #a3a9c2;
    --border: #2a2f44;
    --primary: #818cf8;
    --primary-text: #0e1018;
    --ok: #4ade80;
    --bad: #f87171;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 8px 24px rgb(0 0 0 / 30%);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e1018;
  --surface: #171a26;
  --text: #eef0f8;
  --muted: #a3a9c2;
  --border: #2a2f44;
  --primary: #818cf8;
  --primary-text: #0e1018;
  --ok: #4ade80;
  --bad: #f87171;
  --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 8px 24px rgb(0 0 0 / 30%);
  color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
#app { min-height: 100vh; display: flex; flex-direction: column; }
.topbar { display: flex; justify-content: space-between; align-items: center; padding: 16px 24px; }
.brand { font-weight: 800; font-size: 1.25rem; letter-spacing: -0.02em; color: var(--text); text-decoration: none; }
.brand span { color: var(--primary); }
main { flex: 1; width: 100%; max-width: 880px; margin: 0 auto; padding: 8px 24px 32px; }
footer { padding: 16px 24px 24px; text-align: center; color: var(--muted); font-size: 0.875rem; }
footer a { color: inherit; }

h1 { font-size: 2.25rem; line-height: 1.15; letter-spacing: -0.03em; margin: 0 0 8px; }
h2 { font-size: 1.5rem; margin: 0 0 12px; letter-spacing: -0.02em; }
.lead { color: var(--muted); font-size: 1.125rem; margin: 0 0 24px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 24px; box-shadow: var(--shadow); }
.stack > * + * { margin-top: 16px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }

button, .linkbtn {
  font: inherit; font-weight: 600; border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); padding: 12px 20px; cursor: pointer; min-height: 48px;
}
button:hover:not(:disabled) { border-color: var(--primary); }
button:focus-visible, input:focus-visible, select:focus-visible, a:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }
button:disabled { opacity: 0.55; cursor: not-allowed; }
.primary, .cta { background: var(--primary); color: var(--primary-text); border-color: var(--primary); }
.primary:hover:not(:disabled), .cta:hover:not(:disabled) { filter: brightness(1.08); }
.quiet { background: transparent; border-color: transparent; color: var(--muted); padding: 8px 12px; min-height: 40px; }

label { display: block; font-weight: 600; margin-bottom: 6px; }
input, select {
  width: 100%; font: inherit; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); min-height: 48px;
}
.code-input { text-transform: uppercase; letter-spacing: 0.2em; font-weight: 700; }
.error { color: var(--bad); font-weight: 600; margin: 0; }

.code { font-size: 3rem; font-weight: 800; letter-spacing: 0.18em; font-variant-numeric: tabular-nums; margin: 0; }
.muted { color: var(--muted); }
.joinlink { word-break: break-all; font-size: 0.9375rem; }

.players { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; }
.player { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-radius: 12px; background: var(--bg); border: 2px solid var(--pc, var(--border)); font-weight: 600; }
.player .avatar { font-size: 1.5rem; }
.player.you { box-shadow: 0 0 0 2px var(--primary); }
.player.offline { opacity: 0.5; }

.progress { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; color: var(--muted); font-weight: 600; }
.timer { font-size: 1.5rem; font-weight: 800; color: var(--text); font-variant-numeric: tabular-nums; min-width: 3ch; text-align: right; }
.timer.low { color: var(--bad); }
.question { font-size: 1.75rem; line-height: 1.25; margin: 8px 0 24px; }
.answers { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.answer { display: flex; align-items: center; gap: 12px; text-align: left; color: #fff; border: 0; font-size: 1.0625rem; padding: 18px 20px; min-height: 76px; }
.answer:hover:not(:disabled) { filter: brightness(1.1); }
.answer .shape { font-size: 1.25rem; }
.answer.a0 { background: var(--a0); } .answer.a1 { background: var(--a1); }
.answer.a2 { background: var(--a2); } .answer.a3 { background: var(--a3); }
.answer.picked { outline: 4px solid var(--text); outline-offset: 2px; }
.answer.dim { background-image: linear-gradient(rgb(0 0 0 / 50%), rgb(0 0 0 / 50%)); }
.answer.right { outline: 4px solid var(--ok); outline-offset: 2px; }
.answer .count { margin-left: auto; font-weight: 800; }
.answers.plain { list-style: none; padding: 0; margin: 0; }
.status-line { margin-top: 16px; }
.verdict { font-size: 1.5rem; font-weight: 800; margin: 0 0 4px; }
.verdict.ok { color: var(--ok); } .verdict.bad { color: var(--bad); }

.board { list-style: none; padding: 0; margin: 0; }
.board li { display: flex; align-items: center; gap: 12px; padding: 10px 4px; border-bottom: 1px solid var(--border); }
.board .rank { width: 2ch; font-weight: 800; color: var(--muted); }
.board .name { flex: 1; font-weight: 600; }
.board .score { font-weight: 800; font-variant-numeric: tabular-nums; }
.board li.you { background: color-mix(in srgb, var(--primary) 12%, transparent); border-radius: 8px; }

.podium { display: flex; justify-content: center; align-items: flex-end; gap: 12px; margin: 16px 0 24px; }
.podium .step { flex: 1; max-width: 200px; text-align: center; }
.podium .block { border-radius: 12px 12px 0 0; padding: 12px 8px; background: var(--surface); border: 1px solid var(--border); border-bottom: 0; }
.podium .first .block { height: 150px; } .podium .second .block { height: 110px; } .podium .third .block { height: 80px; }
.podium .medal { font-size: 2rem; }
.podium .avatar { font-size: 2.5rem; }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (max-width: 640px) {
  h1 { font-size: 1.75rem; }
  .answers { grid-template-columns: 1fr; }
  .code { font-size: 2.25rem; }
  main { padding: 8px 16px 24px; }
}

.toolbar { display: flex; align-items: center; gap: 8px; }
.account { display: flex; align-items: center; gap: 4px; font-size: 0.9375rem; }
.qbox { border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin: 0; }
.qbox > * + * { margin-top: 12px; }
.qbox legend { font-weight: 700; padding: 0 8px; }
.answer-row { display: flex; align-items: center; gap: 10px; }
.answer-row input[type="radio"], .check input { width: 22px; min-height: 22px; height: 22px; flex: none; }
.check { display: flex; align-items: center; gap: 10px; }
.check label { margin: 0; }
.hint { margin: 0; font-size: 0.9375rem; }
@media (max-width: 640px) { .account .muted { display: none; } }