.board {
  display: grid;
  gap: 8px;
  width: 100%;
  max-width: 480px;
  perspective: 800px;
}
.board.cols-4 { grid-template-columns: repeat(4, 1fr); }
.board.cols-6 { grid-template-columns: repeat(6, 1fr); }

.card {
  aspect-ratio: 1;
  position: relative;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.4s cubic-bezier(.5, -0.2, .5, 1.6);
}
.card.flipped, .card.matched {
  transform: rotateY(180deg);
}
.card.matched .card-front {
  box-shadow: 0 0 0 3px var(--accent), 0 0 24px rgba(237, 194, 46, 0.7);
}

.card-face {
  position: absolute;
  inset: 0;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: clamp(20px, 6vmin, 36px);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  user-select: none;
}
.card-back {
  background: linear-gradient(135deg, var(--btn-bg), #a08878);
  color: rgba(255, 255, 255, 0.4);
  background-image: repeating-linear-gradient(
    45deg,
    rgba(255,255,255,0.05) 0,
    rgba(255,255,255,0.05) 6px,
    transparent 6px,
    transparent 12px
  );
}
.card-front {
  transform: rotateY(180deg);
  color: #fff;
  font-size: 2.2rem;
  position: relative;
}
.card-emoji-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 10%;
  pointer-events: none;
}

.overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 100;
  animation: fadein .3s ease-in-out;
}
.overlay[hidden] { display: none; }
.overlay-text {
  font-size: clamp(36px, 8vmin, 56px);
  font-weight: 800;
  color: var(--text);
  text-align: center;
}
@keyframes fadein { from { opacity: 0; } to { opacity: 1; } }

/* SitePause: hide cards while paused */
.board.site-paused { visibility: hidden; }