/* Memory — page-specific styles */

.memory-grid {
  display: grid;
  grid-template-columns: repeat(var(--memory-columns, 4), 1fr);
  gap: 0.6rem;
  width: min(100%, 34rem);
  margin: 0 auto;
}

.memory-card {
  aspect-ratio: 3 / 4;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  perspective: 700px;
  border-radius: var(--radius-sm);
}

.memory-card:focus-visible {
  outline: 3px solid var(--color-coral);
  outline-offset: 3px;
}

.memory-card:disabled {
  cursor: default;
}

.memory-card-inner {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.4, 0.1, 0.2, 1);
}

.memory-card.is-flipped .memory-card-inner {
  transform: rotateY(180deg);
}

.memory-card-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  box-shadow: var(--shadow-soft);
}

.memory-card-back {
  background: linear-gradient(140deg, var(--color-purple), var(--color-sky));
  color: rgba(255, 255, 255, 0.9);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 5vw, 2.25rem);
  border: 3px solid rgba(255, 255, 255, 0.4);
}

.memory-card-front {
  background: var(--color-bg-alt);
  border: 3px solid #e8e2d8;
  font-size: clamp(1.75rem, 7vw, 2.75rem);
  line-height: 1;
  transform: rotateY(180deg);
}

.memory-card:hover:not(:disabled) .memory-card-back {
  filter: brightness(1.08);
}

.memory-card.is-matched .memory-card-front {
  background: #f2fbf3;
  border-color: var(--color-green);
  animation: memory-pop 0.45s ease;
}

@keyframes memory-pop {
  0% { transform: rotateY(180deg) scale(1); }
  45% { transform: rotateY(180deg) scale(1.1); }
  100% { transform: rotateY(180deg) scale(1); }
}

/* Themes are chosen often, so let that row breathe on wide screens. */
#theme-buttons {
  max-width: 30rem;
}

@media (prefers-reduced-motion: reduce) {
  .memory-card-inner {
    transition: none;
  }
  .memory-card.is-matched .memory-card-front {
    animation: none;
  }
}

@media (max-width: 640px) {
  .memory-grid {
    gap: 0.4rem;
  }
}