:root {
  color-scheme: dark;
  --ink: #f4f0e7;
  --muted: #aaa89f;
  --acid: #d7ff38;
  --orange: #ff5c35;
  --panel: #171814;
  --line: #37392f;
  font-family: "Arial Narrow", "DIN Condensed", Impact, system-ui, sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: #0c0d0b; color: var(--ink); background-image: linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px); background-size: 34px 34px; }
button { font: inherit; }
.topbar { height: 78px; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; padding: 0 clamp(20px, 5vw, 72px); }
.brand { color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 13px; letter-spacing: .08em; font-size: 20px; }
.brand b { color: var(--acid); font-weight: 900; }
.brand-mark { width: 24px; height: 24px; background: var(--orange); clip-path: polygon(50% 0, 100% 100%, 0 100%); display: block; }
.score-button { background: transparent; color: var(--ink); border: 0; display: grid; grid-template-columns: auto auto; gap: 9px; align-items: baseline; cursor: pointer; }
.score-button span { font: 11px system-ui; color: var(--muted); letter-spacing: .15em; }
.score-button strong { font-size: 24px; color: var(--acid); }
main { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.intro { padding: clamp(54px, 9vh, 100px) 0 60px; }
.eyebrow { font: 700 11px system-ui; color: var(--acid); letter-spacing: .2em; }
h1 { font-size: clamp(64px, 10vw, 132px); line-height: .82; letter-spacing: -.035em; margin: 22px 0 32px; text-transform: uppercase; }
h1 em { font-style: normal; color: transparent; -webkit-text-stroke: 2px var(--ink); }
.lead { width: min(600px, 100%); font: 17px/1.8 system-ui; color: var(--muted); margin: 0 0 40px; }
.group-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); }
.group-card { min-height: 142px; color: var(--ink); background: rgba(23,24,20,.8); border: 0; border-right: 1px solid var(--line); padding: 24px; text-align: left; cursor: pointer; position: relative; transition: background .18s, color .18s; }
.group-card:last-child { border-right: 0; }
.group-card:hover { background: #22241d; }
.group-card.selected { background: var(--acid); color: #10110d; }
.group-card small { display: block; font: 11px system-ui; letter-spacing: .16em; opacity: .65; margin-bottom: 30px; }
.group-card strong { font-size: 25px; letter-spacing: .02em; }
.group-card span { position: absolute; right: 20px; top: 18px; font: 700 14px system-ui; }
.start-row { margin-top: 26px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.rules { display: flex; flex-wrap: wrap; gap: 12px 24px; color: var(--muted); font: 12px system-ui; }
.rules span::before { content: "•"; color: var(--acid); margin-right: 8px; }
.primary, .secondary { min-height: 58px; border: 0; padding: 0 25px; cursor: pointer; font-size: 18px; letter-spacing: .03em; }
.primary { background: var(--orange); color: white; display: flex; align-items: center; gap: 35px; }
.primary:hover { background: #ff704f; }
.primary:disabled { opacity: .45; cursor: not-allowed; }
.secondary { border: 1px solid var(--line); color: var(--ink); background: transparent; }
.hidden { display: none !important; }
.game { padding: 28px 0 60px; max-width: 920px; margin: auto; }
.game-head { display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; }
.text-button { background: none; color: var(--muted); border: 0; justify-self: start; cursor: pointer; padding: 10px 0; }
.progress-meta { text-align: center; font: 12px system-ui; color: var(--muted); }
.progress-meta b { color: var(--ink); margin-left: 12px; }
.streak { justify-self: end; display: flex; align-items: baseline; gap: 8px; }
.streak span { font: 10px system-ui; color: var(--muted); letter-spacing: .15em; }
.streak strong { font-size: 28px; color: var(--acid); }
.progress { height: 3px; background: var(--line); margin: 14px 0 22px; }
.progress i { display: block; height: 100%; width: 0; background: var(--acid); transition: width .25s; }
.arena { height: min(43vh, 380px); min-height: 280px; border: 1px solid var(--line); background: #e5e2d8; display: grid; place-items: center; position: relative; overflow: hidden; }
.arena::after { content: ""; position: absolute; inset: 0; pointer-events: none; background: repeating-linear-gradient(0deg, transparent 0 3px, rgba(0,0,0,.025) 3px 4px); }
#signCanvas { width: min(520px, 90%); height: min(340px, 90%); }
.timer-ring { z-index: 3; position: absolute; top: 16px; right: 16px; border: 1px solid #222; color: #222; width: 54px; height: 54px; display: grid; place-items: center; border-radius: 50%; font: 700 14px system-ui; background: rgba(229,226,216,.82); }
.flash-cover { position: absolute; inset: 0; z-index: 2; background: #151611; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.flash-cover span { color: var(--acid); font-size: clamp(35px, 6vw, 62px); }
.flash-cover small { color: var(--muted); font: 13px system-ui; margin-top: 10px; }
.prompt { text-align: center; font: 13px system-ui; color: var(--muted); margin: 22px 0 14px; }
.answers { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.answer { border: 1px solid var(--line); color: var(--ink); background: var(--panel); min-height: 76px; padding: 13px 18px; text-align: left; cursor: pointer; display: grid; grid-template-columns: 42px 1fr; align-items: center; gap: 14px; transition: border .15s, transform .15s; }
.answer:hover:not(:disabled) { border-color: var(--acid); transform: translateY(-2px); }
.answer:disabled { cursor: default; }
.answer.correct { background: var(--acid); color: #111; border-color: var(--acid); }
.answer.wrong { background: var(--orange); color: white; border-color: var(--orange); }
.mini-sign { width: 38px; height: 38px; display: grid; place-items: center; font: 900 17px system-ui; color: #111; background: #f0eee6; border: 3px solid currentColor; }
.mini-sign.circle { border-radius: 50%; }
.mini-sign.triangle { clip-path: polygon(50% 0, 100% 100%, 0 100%); padding-top: 11px; }
.mini-sign.diamond { transform: rotate(45deg) scale(.72); }
.mini-sign.diamond i { transform: rotate(-45deg); font-style: normal; }
.answer-text strong { display: block; font: 700 16px system-ui; }
.answer-text small { color: inherit; opacity: .62; font: 11px system-ui; }
.feedback { border-left: 4px solid var(--acid); margin-top: 12px; background: #1c1e18; padding: 13px 18px; font: 13px/1.5 system-ui; color: var(--muted); }
.feedback strong { color: var(--ink); }
.summary { text-align: center; max-width: 760px; margin: auto; padding: 70px 0; }
.summary-icon { margin: 0 auto 22px; width: 76px; height: 76px; border: 3px solid var(--acid); color: var(--acid); display: grid; place-items: center; font-size: 36px; transform: rotate(45deg); }
.summary-icon::first-letter { transform: rotate(-45deg); }
.summary h2 { font-size: clamp(46px, 8vw, 84px); margin: 12px 0 40px; }
.summary-metrics { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.summary-metrics div { padding: 25px 10px; border-right: 1px solid var(--line); }
.summary-metrics div:last-child { border: 0; }
.summary-metrics strong { display: block; color: var(--acid); font-size: 34px; }
.summary-metrics span { font: 11px system-ui; color: var(--muted); }
.wrong-summary { font: 13px/1.6 system-ui; color: var(--muted); padding: 24px; }
.summary-actions { display: flex; justify-content: center; gap: 10px; }
dialog { width: min(600px, calc(100% - 28px)); background: #151611; color: var(--ink); border: 1px solid var(--line); padding: 28px; }
dialog::backdrop { background: rgba(0,0,0,.78); }
.dialog-head { display: flex; justify-content: space-between; align-items: start; }
.dialog-head h2 { font-size: 40px; margin: 5px 0 25px; }
.dialog-head button { border: 0; background: none; color: var(--muted); font-size: 32px; cursor: pointer; }
.stat-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; padding: 16px 0; border-top: 1px solid var(--line); font: 13px system-ui; }
.stat-row small { display: block; color: var(--muted); margin-top: 5px; }
.stat-row strong { color: var(--acid); font-size: 20px; }
.mistakes { margin: 22px 0; font: 12px/1.8 system-ui; color: var(--muted); }
.danger { color: #ff8061; background: transparent; border: 1px solid #693224; padding: 10px 14px; cursor: pointer; width: 100%; }
.empty { color: var(--muted); font: 14px system-ui; padding: 30px 0; }

@media (max-width: 680px) {
  .topbar { height: 64px; }
  main { width: min(100% - 24px, 1120px); }
  .intro { padding-top: 45px; }
  h1 { font-size: clamp(55px, 18vw, 90px); }
  .group-grid { grid-template-columns: 1fr; }
  .group-card { min-height: 105px; border-right: 0; border-bottom: 1px solid var(--line); }
  .group-card:last-child { border-bottom: 0; }
  .group-card small { margin-bottom: 16px; }
  .start-row { align-items: stretch; flex-direction: column; }
  .primary { justify-content: space-between; }
  .game { padding-top: 15px; }
  .game-head { grid-template-columns: auto 1fr auto; gap: 10px; }
  .progress-meta span { display: none; }
  .arena { min-height: 240px; height: 36vh; }
  .answers { grid-template-columns: 1fr; }
  .answer { min-height: 64px; }
  .summary { padding-top: 42px; }
  .summary-metrics strong { font-size: 25px; }
  .summary-actions { flex-direction: column; }
  .summary-actions .primary { justify-content: center; }
}

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; } }