/* HUD — score / timer / lives */
.hud {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
  width: 100%;
  max-width: var(--board-max);
  margin-inline: auto;
}

.hud__cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-2);
  border: var(--border-width) solid var(--color-ink);
  background: var(--color-paper);
}

.hud__label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.hud__value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  min-width: 2ch;
  text-align: center;
}

.hud__value.is-pulse {
  animation: value-pulse var(--duration-base) var(--ease-pop);
}

.hud__value.is-warn {
  animation: value-warn 0.5s steps(2, end) infinite;
}

@keyframes value-pulse {
  0% { transform: scale(1); }
  40% { transform: scale(1.18); }
  100% { transform: scale(1); }
}

@keyframes value-warn {
  50% { opacity: 0.35; }
}