:root {
  --bg: #111013;
  --panel: #1a191d;
  --line: rgba(212, 175, 55, 0.22);
  --gold: #d4af37;
  --gold-deep: #8a6a17;
  --text: #efe9dc;
  --hit: rgba(34, 160, 84, 0.72);
  --miss: rgba(196, 40, 40, 0.72);
  --coin: min(64vmin, 340px);
  --thick: calc(var(--coin) * 0.045);
  --flip-ms: 1700ms;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3efe6;
    --panel: #fbf8f2;
    --line: rgba(138, 106, 23, 0.28);
    --text: #231f18;
  }
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 500 1rem/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

main {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
  padding: 24px 16px;
}

.box {
  position: relative;
  width: calc(var(--coin) + 80px);
  max-width: 100%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
}

.stage {
  width: var(--coin);
  height: var(--coin);
  perspective: 1200px;
}

.stage.tossing { animation: toss var(--flip-ms) cubic-bezier(.3, .6, .4, 1); }

@keyframes toss {
  0%   { transform: translateY(0) scale(1); }
  45%  { transform: translateY(-4%) scale(1.06); }
  100% { transform: translateY(0) scale(1); }
}

.coin {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform var(--flip-ms) cubic-bezier(.25, .8, .25, 1);
}

.face, .rim {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
}

.face {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  user-select: none;
  -webkit-user-drag: none;
}

.heads { transform: translateZ(calc(var(--thick) / 2)); }
.tails { transform: rotateX(180deg) translateZ(calc(var(--thick) / 2)); }

.rim { background: radial-gradient(circle, var(--gold) 0 60%, var(--gold-deep) 100%); }

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  opacity: 0;
  transition: opacity 220ms ease;
  pointer-events: none;
}

.overlay span {
  color: #fff;
  font-size: clamp(1.6rem, 7vmin, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.45);
}

.box.hit .overlay  { background: var(--hit);  opacity: 1; }
.box.miss .overlay { background: var(--miss); opacity: 1; }

.calls {
  display: flex;
  gap: 14px;
  width: calc(var(--coin) + 80px);
  max-width: 100%;
}

.calls button {
  flex: 1;
  min-height: 52px;
  padding: 12px 16px;
  font: inherit;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  background: transparent;
  border: 1.5px solid var(--gold);
  border-radius: 12px;
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease, opacity 150ms ease;
}

.calls button:hover:not([aria-disabled="true"]),
.calls button[aria-pressed="true"] {
  background: var(--gold);
  color: #1a1407;
}

.calls button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.calls button[aria-disabled="true"] { cursor: default; opacity: 0.55; }
.calls button[aria-pressed="true"][aria-disabled="true"] { opacity: 1; }

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  :root { --flip-ms: 1ms; }
  .stage.tossing { animation: none; }
}