:root {
  color-scheme: light;
  --paper: #f4efe3;
  --ink: #171713;
  --muted: #625f56;
  --red: #a92d25;
  --red-bright: #d94a3c;
  --cork: #b9824e;
  --cork-dark: #79502f;
  --metal: #314149;
  --line: #8f897d;
  --page-width: 1120px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", "PingFang TC", sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--paper); scroll-behavior: smooth; }
body { min-width: 320px; margin: 0; overflow-x: hidden; color: var(--ink); background: var(--paper); }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
button:focus-visible, a:focus-visible, canvas:focus-visible, [tabindex="-1"]:focus-visible {
  outline: 3px solid var(--red);
  outline-offset: 4px;
}
main, footer { width: min(var(--page-width), calc(100% - 40px)); margin-inline: auto; }

.dart-hero {
  display: grid;
  padding: clamp(48px, 8vw, 96px) 0 clamp(34px, 6vw, 66px);
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, .5fr);
  gap: clamp(32px, 7vw, 88px);
  align-items: end;
}
.hero-code, .section-code {
  margin: 0 0 16px;
  color: var(--red);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .14em;
}
.dart-hero h1 {
  margin: 0;
  font-size: clamp(4.6rem, 10vw, 8.2rem);
  font-weight: 900;
  letter-spacing: -.09em;
  line-height: .84;
}
.hero-copy { padding: 16px 0 4px 18px; border-left: 1px solid var(--line); }
.hero-copy p { margin: 0; color: var(--muted); font-size: .9rem; line-height: 1.8; }
.hero-copy a {
  display: inline-flex;
  min-height: 44px;
  margin-top: 14px;
  padding: 10px 0 7px;
  align-items: center;
  border-bottom: 2px solid currentColor;
  color: var(--ink);
  font-size: .78rem;
  font-weight: 850;
  text-decoration: none;
}
.hero-copy a:hover { color: var(--red); }

.game-station { border: 2px solid var(--ink); background: var(--ink); box-shadow: 10px 10px 0 var(--cork-dark); }
.scoreboard {
  display: grid;
  min-height: 86px;
  padding: 16px clamp(16px, 3vw, 30px);
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  align-items: center;
  color: #f7f1e6;
}
.scoreboard div { display: flex; align-items: baseline; gap: 7px; }
.scoreboard div:nth-child(2) { justify-content: center; }
.scoreboard div:last-child { justify-content: end; }
.scoreboard span { color: #c3bdb1; font-size: .64rem; font-weight: 750; letter-spacing: .12em; }
.scoreboard strong { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: clamp(1.25rem, 3vw, 2.25rem); font-variant-numeric: tabular-nums; }
.scoreboard small { color: #c3bdb1; font-size: .65rem; }
.canvas-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-top: 1px solid #4c4a44;
  background: var(--cork);
}
#game-canvas { position: absolute; inset: 0; display: block; width: 100%; height: 100%; cursor: crosshair; touch-action: none; }
.game-overlay { position: absolute; inset: 0; display: grid; padding: 20px; place-items: center; background: rgb(23 23 19 / 38%); }
.game-overlay[hidden] { display: none; }
.overlay-panel {
  width: min(520px, calc(100% - 20px));
  padding: clamp(24px, 5vw, 48px);
  border: 2px solid var(--ink);
  background: #fffaf0;
  box-shadow: 10px 10px 0 var(--red);
  text-align: center;
}
.overlay-panel > p:first-child { margin: 0 0 13px; color: var(--red); font-size: .68rem; font-weight: 850; letter-spacing: .14em; }
.overlay-panel h2 { margin: 0; font-size: clamp(2.2rem, 6vw, 4.6rem); letter-spacing: -.06em; line-height: 1; }
.overlay-panel > p:not(:first-child) { margin: 20px 0 0; color: var(--muted); font-size: .82rem; line-height: 1.7; }
.overlay-panel button {
  min-height: 48px;
  margin-top: 24px;
  padding: 12px 22px;
  border: 2px solid var(--ink);
  border-radius: 0;
  color: #fff;
  background: var(--red);
  font-weight: 850;
  cursor: pointer;
  transition: background 100ms ease-out;
}
.overlay-panel button:hover { background: #85231e; }
.overlay-panel button:active { background: #681b17; }
.result-panel > p:first-child { color: var(--muted); letter-spacing: 0; }
.result-panel > p strong { color: var(--red); }
.result-actions { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.result-actions button:last-child { color: var(--ink); background: transparent; }
.result-actions button:last-child:hover { background: #eee5d7; }
.game-status { min-height: 49px; margin: 0; padding: 16px 20px; color: #c3bdb1; font-size: .72rem; text-align: center; }

.dart-content, .dart-faq {
  display: grid;
  padding: clamp(72px, 10vw, 118px) 0;
  grid-template-columns: minmax(130px, .3fr) minmax(0, 1fr);
  gap: clamp(30px, 7vw, 92px);
  border-bottom: 1px solid var(--line);
}
.section-code { margin-top: 8px; }
.dart-content h2, .dart-faq h2 { margin: 0 0 26px; font-size: clamp(2rem, 5vw, 4.4rem); letter-spacing: -.055em; line-height: 1.04; }
.dart-content > div > p { margin: 0; color: var(--muted); line-height: 1.9; }
.dart-content dl { display: grid; margin: 38px 0 0; grid-template-columns: repeat(3, 1fr); border-block: 1px solid var(--line); }
.dart-content dl div { padding: 18px; border-right: 1px solid var(--line); }
.dart-content dl div:last-child { border-right: 0; }
.dart-content dt { color: var(--muted); font-size: .68rem; }
.dart-content dd { margin: 8px 0 0; font-weight: 750; }
.dart-faq details { border-top: 1px solid var(--line); }
.dart-faq details:last-child { border-bottom: 1px solid var(--line); }
.dart-faq summary { min-height: 52px; padding: 16px 0; font-weight: 750; cursor: pointer; }
.dart-faq details p { margin: 0; padding: 0 0 20px; color: var(--muted); line-height: 1.8; }
footer { display: flex; padding: 34px 0 48px; justify-content: space-between; gap: 20px; color: var(--muted); font-size: .72rem; }
footer p { margin: 0; }
footer nav { display: flex; gap: 18px; }
footer a { min-height: 44px; color: inherit; text-underline-offset: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 720px) {
  main, footer { width: min(var(--page-width), calc(100% - 24px)); }
  .dart-hero { padding-top: 34px; grid-template-columns: 1fr; gap: 28px; }
  .dart-hero h1 { font-size: min(calc(13vw + .5rem), 5.5rem); }
  .hero-copy { padding: 14px 0 0; border-top: 1px solid var(--line); border-left: 0; }
  .game-station { box-shadow: 5px 5px 0 var(--cork-dark); }
  .scoreboard { min-height: 74px; padding-inline: 12px; gap: 8px; }
  .scoreboard div { display: grid; gap: 2px; text-align: left; }
  .scoreboard div:nth-child(2) { justify-content: center; }
  .scoreboard div:last-child { justify-content: end; text-align: right; }
  .scoreboard small { display: none; }
  .canvas-wrap { aspect-ratio: 4 / 5; }
  .game-overlay { padding: 10px; }
  .overlay-panel { padding: 24px 18px; box-shadow: 6px 6px 0 var(--red); }
  .overlay-panel h2 { font-size: min(calc(8vw + .75rem), 3.4rem); }
  .result-actions { display: grid; }
  .result-actions button { margin-top: 14px; }
  .dart-content, .dart-faq { grid-template-columns: 1fr; gap: 20px; }
  .dart-content h2, .dart-faq h2 { font-size: min(calc(6vw + .75rem), 3rem); }
  .dart-content dl { grid-template-columns: 1fr; }
  .dart-content dl div { border-right: 0; border-bottom: 1px solid var(--line); }
  .dart-content dl div:last-child { border-bottom: 0; }
  footer { display: grid; }
}

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