:root {
  --ink: #f2fbff;
  --muted: rgba(221, 244, 255, 0.68);
  --cyan: #5ef6ff;
  --mint: #39e9ad;
  --pink: #ff4fd8;
  --gold: #ffd166;
  --panel: rgba(6, 20, 30, 0.82);
  --stroke: rgba(105, 239, 255, 0.26);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  color: var(--ink);
  background: #050912;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}

.demo-shell {
  position: fixed;
  inset: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 14%, rgba(94, 246, 255, 0.16), transparent 30%),
    linear-gradient(180deg, #07182b 0%, #06111d 48%, #04070e 100%);
}

#gameCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.hud {
  position: absolute;
  top: max(12px, env(safe-area-inset-top));
  left: 12px;
  right: 12px;
  z-index: 5;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  pointer-events: none;
}

.hud-card {
  min-width: 0;
  border: 1px solid var(--stroke);
  border-radius: 16px;
  padding: 9px 8px;
  text-align: center;
  background: linear-gradient(180deg, rgba(12, 38, 54, 0.88), rgba(4, 13, 21, 0.72));
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.28), inset 0 0 18px rgba(94, 246, 255, 0.06);
}

.hud-card span {
  display: block;
  color: var(--muted);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hud-card strong {
  display: block;
  margin-top: 2px;
  color: var(--gold);
  font-size: 1rem;
  line-height: 1.1;
}

.overlay {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: 18px;
  background: linear-gradient(180deg, rgba(3, 8, 15, 0.5), rgba(3, 8, 15, 0.82));
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.overlay-card {
  width: min(100%, 330px);
  border: 1px solid var(--stroke);
  border-radius: 26px;
  padding: 24px 18px 18px;
  text-align: center;
  background: linear-gradient(180deg, rgba(8, 27, 40, 0.96), rgba(4, 12, 20, 0.94));
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.48), inset 0 0 56px rgba(94, 246, 255, 0.06);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--cyan);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(2.25rem, 13vw, 3.6rem);
  line-height: 0.95;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-shadow: 0 0 28px rgba(94, 246, 255, 0.35);
}

#overlayText {
  margin: 0 auto 16px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.control-grid {
  display: grid;
  gap: 8px;
  margin: 0 0 18px;
}

.control-grid span {
  border: 1px solid rgba(105, 239, 255, 0.14);
  border-radius: 14px;
  padding: 9px 10px;
  color: rgba(242, 251, 255, 0.84);
  background: rgba(94, 246, 255, 0.06);
  font-size: 0.78rem;
  font-weight: 800;
}

button {
  width: 100%;
  min-height: 48px;
  border: 0;
  border-radius: 999px;
  color: #041016;
  background: linear-gradient(135deg, var(--cyan), var(--mint) 55%, var(--gold));
  box-shadow: 0 16px 34px rgba(57, 233, 173, 0.2);
  font: inherit;
  font-weight: 950;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
}

button:active {
  transform: translateY(1px) scale(0.99);
}

.fine-print,
.control-hint {
  color: rgba(221, 244, 255, 0.48);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.fine-print {
  margin: 13px 0 0;
}

.control-hint {
  position: absolute;
  left: 50%;
  bottom: max(12px, env(safe-area-inset-bottom));
  z-index: 4;
  width: min(90%, 330px);
  margin: 0;
  border: 1px solid rgba(105, 239, 255, 0.12);
  border-radius: 999px;
  padding: 9px 12px;
  text-align: center;
  background: rgba(3, 12, 20, 0.64);
  transform: translateX(-50%);
  pointer-events: none;
}

@media (max-width: 360px) {
  .hud {
    gap: 6px;
  }

  .hud-card {
    padding: 8px 4px;
  }

  .overlay-card {
    padding-inline: 14px;
  }
}