/* Tile Matcher - interactive memory / matching game */
.tile-matcher {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.tile-matcher__grid {
  display: grid;
  grid-template-columns: repeat(var(--tm-cols, auto-fit), minmax(96px, 1fr));
  gap: var(--space-3);
}
.tile-matcher__tile {
  position: relative;
  aspect-ratio: 1;
  padding: 0;
  border: 0;
  background: transparent;
  perspective: 800px;
  cursor: pointer;
}
.tile-matcher__tile:disabled {
  cursor: default;
}
.tile-matcher__tile:focus-visible {
  outline: var(--focus-outline-width) solid var(--focus-outline-color);
  outline-offset: 2px;
}
.tile-matcher__inner {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform var(--dur-base) var(--ease-out);
}
.tile-matcher__tile[data-state='up'] .tile-matcher__inner,
.tile-matcher__tile[data-state='matched'] .tile-matcher__inner {
  transform: rotateY(180deg);
}
.tile-matcher__face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-3);
  border: var(--border-width-default) solid var(--foreground-quaternary);
  backface-visibility: hidden;
  font-size: var(--fs-md);
  font-weight: var(--fw-bold);
  line-height: var(--lh-snug);
  overflow: hidden;
}
.tile-matcher__face--back {
  background: var(--background-tertiary);
  color: var(--foreground-secondary);
}
.tile-matcher__face--front {
  background: var(--background-secondary);
  color: var(--foreground-primary);
  transform: rotateY(180deg);
}
.tile-matcher__cover {
  width: 40%;
  height: 40%;
  border: var(--border-width-thick) solid var(--foreground-quaternary);
  border-radius: 50%;
}
.tile-matcher__tile:hover:not(:disabled) .tile-matcher__face--back {
  border-color: var(--highlight-color);
  color: var(--foreground-primary);
}
.tile-matcher__tile[data-state='up'] .tile-matcher__face--front {
  border-color: var(--highlight-color);
  background: var(--highlight-background);
}
.tile-matcher__tile[data-state='matched'] .tile-matcher__face--front {
  border-color: var(--success-color);
  background: var(--success-background);
  color: var(--success-color);
}
.tile-matcher__face--front img,
.tile-matcher__face--front svg {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
/* No-flip mode: swap faces instantly, no 3D rotation. */
.tile-matcher--no-flip .tile-matcher__inner {
  transform: none;
  transition: none;
}
.tile-matcher--no-flip
  .tile-matcher__tile[data-state='up']
  .tile-matcher__inner,
.tile-matcher--no-flip
  .tile-matcher__tile[data-state='matched']
  .tile-matcher__inner {
  transform: none;
}
.tile-matcher--no-flip .tile-matcher__face--front {
  transform: none;
}
.tile-matcher--no-flip
  .tile-matcher__tile[data-state='down']
  .tile-matcher__face--front,
.tile-matcher--open
  .tile-matcher__tile[data-state='down']
  .tile-matcher__face--front {
  opacity: 0;
}
.tile-matcher--no-flip
  .tile-matcher__tile[data-state='down']
  .tile-matcher__face--back {
  opacity: 1;
}
/* Faces-shown mode: front always visible; back only masks the down state. */
.tile-matcher--open .tile-matcher__inner {
  transform: none;
}
.tile-matcher--open .tile-matcher__face--front {
  transform: none;
}
.tile-matcher--open
  .tile-matcher__tile[data-state='down']
  .tile-matcher__face--back {
  opacity: 0;
}
.tile-matcher__sr-status {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
@media (prefers-reduced-motion: reduce) {
  .tile-matcher__inner {
    transition: none;
  }
}