/* matching.css — card grid + 3D flip. Grid dimensions and card size are set
   from JS (engine/responsive) so cards always fit both orientations. */

.board {
  display: grid;
  grid-template-columns: repeat(var(--cols, 4), var(--card-size, 64px));
  grid-auto-rows: var(--card-size, 64px);
  gap: var(--card-gap, 8px);
  place-content: center;
}

.card {
  width: var(--card-size, 64px);
  height: var(--card-size, 64px);
  perspective: 800px;
  cursor: pointer;
  background: none;
  border: 0;
  padding: 0;
  touch-action: manipulation;
}

.card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.4s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.card.is-flipped .card__inner,
.card.is-matched .card__inner { transform: rotateY(180deg); }

.card__face {
  position: absolute;
  inset: 0;
  border-radius: clamp(6px, 1.6vmin, 12px);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background-size: cover;
  background-position: center;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
  overflow: hidden;
}
.card__face--back {
  background-image: var(--img-card-back);
  background-color: var(--c-secondary);
}
/* fallback pattern when no card-back image is set */
.card__face--back::after {
  content: '';
  position: absolute;
  inset: 14%;
  border-radius: 8px;
  border: 2px dashed color-mix(in srgb, var(--c-text-on-primary) 70%, transparent);
  opacity: var(--card-back-fallback, 1);
}
.card__face--front {
  transform: rotateY(180deg);
  background-color: var(--c-surface);
  background-size: cover;
}
.card__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
/* label sits behind the art; only visible if the image is missing/broken */
.card__label {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 4px;
  color: var(--c-text);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(10px, 2.6vmin, 16px);
  word-break: break-word;
}

.card.is-matched { animation: matched 0.5s ease; }
.card.is-matched .card__inner { box-shadow: 0 0 0 3px var(--c-success); border-radius: clamp(6px, 1.6vmin, 12px); }
.card.is-wrong .card__inner { animation: shake 0.4s ease; }

@keyframes matched {
  0% { transform: scale(1); }
  40% { transform: scale(1.08); }
  100% { transform: scale(1); }
}
@keyframes shake {
  0%, 100% { transform: rotateY(180deg) translateX(0); }
  25% { transform: rotateY(180deg) translateX(-6px); }
  75% { transform: rotateY(180deg) translateX(6px); }
}

/* toolbar row (mute + restart) */
.toolbar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

/* in landscape, give the board more breathing room and shrink chrome */
html.is-landscape .brand { gap: 16px; }
html.is-landscape .brand__title { font-size: clamp(18px, 4.4vmin, 34px); }