.board-shell {
  display: grid;
  gap: var(--space-3);
}

.gem-board {
  display: grid;
  gap: var(--space-2);
  grid-template-columns: repeat(4, var(--board-cell-size));
  justify-content: center;
}

.gem-cell {
  align-items: center;
  aspect-ratio: 1;
  background: linear-gradient(145deg, #30394f, #171b26);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: center;
  min-width: 0;
  overflow: hidden;
  padding: var(--space-1);
}

.gem-image {
  display: block;
  height: 88%;
  image-rendering: auto;
  object-fit: contain;
  pointer-events: none;
  width: 88%;
}

.gem-cell.is-inactive {
  background: rgb(255 255 255 / 0.03);
  border-color: rgb(255 255 255 / 0.08);
  border-style: dashed;
  cursor: default;
}

.gem-cell.is-empty {
  background: linear-gradient(145deg, rgb(74 85 116 / 0.35), rgb(21 25 35 / 0.82));
  border-color: var(--color-accent);
  border-style: dotted;
  box-shadow: inset 0 0 0 2px rgb(255 255 255 / 0.04);
}

.resolution-summary {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0;
  min-height: 1.3em;
  text-align: center;
}

.gem-cell[data-command="TARGET_CELL"] {
  cursor: crosshair;
}

.gem-cell[data-command="TARGET_CELL"]:hover {
  border-color: var(--color-focus);
  transform: translateY(-1px);
}

.attack-summary {
  color: var(--color-text);
  font-size: 0.9rem;
  margin: 0;
  min-height: 1.3em;
  text-align: center;
}

.gem-cell.is-cleared,
.gem-cell.is-cascade-cleared {
  animation: gem-vanish-cell 520ms ease-out both;
  position: relative;
}

.gem-cell.is-cleared::after,
.gem-cell.is-cascade-cleared::after {
  animation: gem-vanish-burst 520ms ease-out both;
  border: 2px solid var(--color-focus);
  border-radius: inherit;
  content: "";
  inset: 14%;
  pointer-events: none;
  position: absolute;
}

.gem-cell.is-cascade-cleared::after {
  border-color: var(--color-accent-strong);
}

.gem-cell.is-settling .gem-image {
  animation: gem-settle 460ms cubic-bezier(0.2, 0.85, 0.25, 1.2) both;
}

@keyframes gem-vanish-cell {
  0% {
    background: radial-gradient(circle, rgb(253 230 138 / 0.42), rgb(48 57 79 / 0.72));
    transform: scale(1.04);
  }

  100% {
    transform: scale(1);
  }
}

@keyframes gem-vanish-burst {
  0% {
    opacity: 0.95;
    transform: scale(0.35) rotate(0deg);
  }

  100% {
    opacity: 0;
    transform: scale(1.65) rotate(35deg);
  }
}

@keyframes gem-settle {
  0% {
    opacity: 0.72;
    transform: translateY(calc(var(--board-cell-size) * -0.45)) scale(0.94);
  }

  70% {
    opacity: 1;
    transform: translateY(5%) scale(1.04);
  }

  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .gem-cell.is-cleared,
  .gem-cell.is-cascade-cleared,
  .gem-cell.is-cleared::after,
  .gem-cell.is-cascade-cleared::after,
  .gem-cell.is-settling .gem-image {
    animation: none;
  }
}