.polyomino-puzzle,
.polyomino-board-panel,
.polyomino-piece-tray {
  display: grid;
  gap: var(--spacing-md);
}

.polyomino-puzzle-heading,
.polyomino-board-heading,
.polyomino-piece-tray-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

.polyomino-puzzle-heading {
  align-items: flex-start;
}

.polyomino-puzzle {
  --puzzle-cell-fill: rgba(30, 41, 59, 0.86);
  --puzzle-cell-edge: rgba(15, 23, 42, 0.96);
  --puzzle-mini-cell-edge: rgba(15, 23, 42, 0.9);
}

.polyomino-puzzle-heading-actions {
  display: flex;
  flex: none;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--spacing-sm);
}

.polyomino-puzzle [data-polyomino-reset]:disabled,
.polyomino-puzzle [data-polyomino-reset]:disabled:hover {
  border-color: var(--accent-light);
  background: transparent;
  box-shadow: none;
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.polyomino-solve-toggle {
  min-inline-size: 7.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
}

.polyomino-puzzle[data-piece-puzzle-mode='solve-selection'] .polyomino-solve-toggle {
  color: #fff;
  border-color: #fbbf24;
  background: linear-gradient(135deg, #b45309 0%, #78350f 100%);
}

.polyomino-puzzle[data-piece-puzzle-mode='solve-selection']
  .polyomino-solve-toggle:hover:not(:disabled),
.polyomino-puzzle[data-piece-puzzle-mode='solve-selection']
  .polyomino-solve-toggle:focus-visible:not(:disabled) {
  color: #fff;
  border-color: #fde68a;
  background: linear-gradient(135deg, #c2410c 0%, #92400e 100%);
}

.polyomino-puzzle[data-piece-puzzle-mode='solve-selection'] .polyomino-solve-toggle:focus-visible {
  outline-color: #fde68a;
}

.polyomino-puzzle[data-piece-puzzle-mode='solve-selection'] .polyomino-solve-toggle:disabled,
.polyomino-puzzle[data-piece-puzzle-mode='solve-selection'] .polyomino-solve-toggle:disabled:hover {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.polyomino-puzzle[data-piece-puzzle-mode='solving'] .polyomino-solve-toggle:disabled {
  opacity: 0.65;
  cursor: wait;
  transform: none;
}

.polyomino-solve-toggle svg {
  width: 1.1rem;
  height: 1.1rem;
  flex: none;
}

.polyomino-solve-toggle svg[hidden] {
  display: none;
}

.polyomino-puzzle-heading h2,
.polyomino-board-heading h3,
.polyomino-piece-tray-heading h3,
.polyomino-instructions,
.polyomino-board-summary,
.polyomino-puzzle-status {
  margin: 0;
}

.polyomino-instructions,
.polyomino-board-summary,
.polyomino-puzzle-status {
  color: var(--text-secondary);
}

.polyomino-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(380px, 1.1fr);
  align-items: start;
  gap: var(--spacing-xl);
}

.polyomino-board-panel,
.polyomino-piece-tray {
  min-width: 0;
  padding: var(--spacing-lg);
  border: 1px solid rgba(148, 163, 184, 0.26);
  border-radius: var(--border-radius-lg);
  background: rgba(15, 23, 42, 0.82);
}

.polyomino-board-stage {
  position: relative;
  width: min(100%, 520px);
  margin: 1.5rem auto 0;
}

.polyomino-board {
  position: relative;
  width: 100%;
  display: grid;
  gap: 0;
  background: transparent;
}

.polyomino-board-cell {
  min-width: 0;
  min-height: 0;
  padding: 0;
  border: 1px solid var(--puzzle-cell-edge);
  border-radius: 1px;
  background: var(--puzzle-cell-fill);
  box-shadow: none;
  cursor: pointer;
  outline: none;
  touch-action: none;
}

.polyomino-board-cell:hover,
.polyomino-board-cell:focus-visible {
  transform: none;
  background: var(--accent);
  border-color: var(--accent-light);
  outline: none;
}

.polyomino-board-cell.is-occupied {
  border-color: color-mix(in srgb, var(--piece-color) 68%, white);
  background: var(--piece-color);
}

.polyomino-puzzle:not(.polyiamond-puzzle) .polyomino-board-cell.is-occupied {
  --piece-connect-top: 0;
  --piece-connect-right: 0;
  --piece-connect-bottom: 0;
  --piece-connect-left: 0;
  position: relative;
  isolation: isolate;
  z-index: 0;
}

.polyomino-puzzle:not(.polyiamond-puzzle) .polyomino-board-cell.is-occupied::before {
  content: '';
  position: absolute;
  top: var(--piece-connect-top);
  right: var(--piece-connect-right);
  bottom: var(--piece-connect-bottom);
  left: var(--piece-connect-left);
  z-index: -1;
  border-radius: 1px;
  background: var(--piece-color);
  pointer-events: none;
}

.polyomino-puzzle:not(.polyiamond-puzzle) .polyomino-board-cell.is-connected-up {
  --piece-connect-top: 0;
}

.polyomino-puzzle:not(.polyiamond-puzzle) .polyomino-board-cell.is-connected-right {
  --piece-connect-right: 0;
}

.polyomino-puzzle:not(.polyiamond-puzzle) .polyomino-board-cell.is-connected-down {
  --piece-connect-bottom: 0;
}

.polyomino-puzzle:not(.polyiamond-puzzle) .polyomino-board-cell.is-connected-left {
  --piece-connect-left: 0;
}

.polyomino-puzzle:not(.polyiamond-puzzle) .polyomino-board-cell.is-selected {
  z-index: 1;
  outline: none;
}

.polyomino-puzzle:not(.polyiamond-puzzle) .polyomino-piece-perimeter {
  position: absolute;
  inset: 0;
  z-index: 3;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.polyomino-puzzle:not(.polyiamond-puzzle) .polyomino-piece-perimeter line {
  fill: none;
  stroke: #fef08a;
  stroke-width: 3px;
  stroke-linecap: square;
  vector-effect: non-scaling-stroke;
}

.polyomino-board-cell.is-preview-valid {
  background: color-mix(in srgb, var(--preview-color) 62%, transparent);
  outline: 2px solid #86efac;
  outline-offset: -3px;
}

.polyomino-board-cell.is-preview-invalid {
  background: color-mix(in srgb, var(--preview-color) 48%, #7f1d1d);
  outline: 2px solid #fca5a5;
  outline-offset: -3px;
}

.polyiamond-puzzle .polyomino-board {
  display: block;
  overflow: visible;
  pointer-events: none;
}

.polyiamond-board-controls {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  touch-action: none;
}

.polyiamond-puzzle .polyiamond-board-cell-visual {
  fill: var(--puzzle-cell-fill);
  stroke: var(--puzzle-cell-edge);
  stroke-width: 2px;
  vector-effect: non-scaling-stroke;
}

.polyiamond-puzzle .polyiamond-board-cell {
  appearance: none;
  position: absolute;
  min-width: 0;
  min-height: 0;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  transform: none;
  -webkit-tap-highlight-color: transparent;
}

.polyiamond-puzzle .polyiamond-board-cell[data-orientation='^'] {
  clip-path: polygon(50% 0, 0 100%, 100% 100%);
}

.polyiamond-puzzle .polyiamond-board-cell[data-orientation='v'] {
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.polyiamond-puzzle .polyiamond-board-cell:focus {
  box-shadow: none;
  transform: none;
  outline: none;
}

.polyiamond-puzzle .polyiamond-board-cell:hover,
.polyiamond-puzzle .polyiamond-board-cell:focus-visible {
  background: rgba(96, 165, 250, 0.3);
  box-shadow: none;
  filter: drop-shadow(0 0 2px var(--accent-light));
  transform: none;
  outline: none;
}

.polyiamond-puzzle .polyiamond-board-cell:active {
  background: rgba(96, 165, 250, 0.45);
  box-shadow: none;
  transform: none;
}

.polyiamond-puzzle .polyiamond-board-cell-visual.is-occupied {
  fill: var(--piece-color);
  stroke: color-mix(in srgb, var(--piece-color) 68%, white);
}

.polyiamond-puzzle .polyiamond-board-cell-visual.is-selected {
  stroke: color-mix(in srgb, var(--piece-color) 68%, white);
  stroke-width: 2px;
}

.polyiamond-puzzle .polyiamond-piece-perimeter {
  pointer-events: none;
}

.polyiamond-puzzle .polyiamond-piece-perimeter line {
  fill: none;
  stroke: #fef08a;
  stroke-width: 3px;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
}

.polyiamond-puzzle .polyiamond-board-cell-visual.is-preview-valid {
  fill: color-mix(in srgb, var(--preview-color) 62%, transparent);
  stroke: #86efac;
  stroke-width: 0.08;
  outline: none;
}

.polyiamond-puzzle .polyiamond-board-cell-visual.is-preview-invalid {
  fill: color-mix(in srgb, var(--preview-color) 48%, #7f1d1d);
  stroke: #fca5a5;
  stroke-width: 0.08;
  outline: none;
}

.polyomino-puzzle:not(.polyiamond-puzzle) .polyomino-board-cell.is-solve-arriving {
  border-color: var(--puzzle-cell-edge);
  background: var(--puzzle-cell-fill);
}

.polyomino-puzzle:not(.polyiamond-puzzle)
  .polyomino-board-cell.is-solve-arriving.is-occupied::before {
  opacity: 0;
}

.polyiamond-puzzle .polyiamond-board-cell.is-solve-arriving {
  background: transparent;
}

.polyomino-piece-count {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
}

.polyomino-piece-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: var(--spacing-sm);
}

.polyomino-piece-region {
  min-width: 0;
  display: grid;
  align-self: start;
  gap: 0.25rem;
}

.polyomino-piece {
  min-height: 96px;
  display: grid;
  place-items: center;
  padding: 0.25rem 0.25rem;
  color: var(--text);
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(30, 41, 59, 0.84);
  touch-action: none;
}

.polyomino-piece:hover,
.polyomino-piece:focus-visible,
.polyomino-piece.is-selected {
  border-color: var(--accent-light);
  background: rgba(30, 64, 175, 0.32);
}

.polyomino-piece.is-selected {
  outline: 2px solid #fef08a;
  outline-offset: 1px;
}

.polyomino-piece.is-solve-selected {
  border-color: #fef08a;
}

.polyomino-puzzle[data-piece-puzzle-mode='solve-selection']
  .polyomino-piece:not(.is-solve-selected) {
  border-color: rgba(148, 163, 184, 0.18);
}

.polyomino-puzzle[data-piece-puzzle-mode='solve-selection']
  .polyomino-piece:not(.is-solve-selected):hover,
.polyomino-puzzle[data-piece-puzzle-mode='solve-selection']
  .polyomino-piece:not(.is-solve-selected):focus-visible {
  border-color: var(--accent-light);
  background: rgba(30, 64, 175, 0.24);
}

.polyomino-puzzle[data-piece-puzzle-mode='solve-selection'] .polyomino-piece.is-solve-selected {
  position: relative;
  z-index: 1;
  border-color: #fef08a;
  background: rgba(30, 64, 175, 0.42);
  box-shadow: 0 0 0 2px rgba(254, 240, 138, 0.2);
}

.polyomino-piece.is-picked-up,
.polyomino-board-cell.is-picked-up {
  opacity: 0.28;
}

.polyomino-piece-pickup {
  --pickup-size: 148px;
  position: fixed;
  left: 0;
  top: 0;
  z-index: 1000;
  width: var(--pickup-size);
  height: var(--pickup-size);
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.polyomino-piece-pickup[hidden] {
  display: none;
}

@keyframes polyomino-piece-pickup-open {
  from {
    opacity: 0;
    scale: 0.76;
  }

  to {
    opacity: 1;
    scale: 1;
  }
}

@keyframes polyomino-piece-pickup-close {
  from {
    opacity: 1;
    scale: 1;
  }

  to {
    opacity: 0;
    scale: 0.76;
  }
}

.polyomino-piece-pickup.is-opening {
  animation: polyomino-piece-pickup-open 180ms cubic-bezier(0.16, 1, 0.3, 1) both;
  will-change: opacity, scale;
}

.polyomino-piece-pickup.is-closing {
  animation: polyomino-piece-pickup-close 140ms ease-in both;
  will-change: opacity, scale;
}

.polyomino-piece-pickup.is-closing .polyomino-piece-pickup-surface,
.polyomino-piece-pickup.is-closing .polyomino-piece-actions button {
  pointer-events: none;
}

.polyomino-piece-pickup::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid rgba(226, 232, 240, 0.46);
  border-radius: 50%;
  background: rgba(30, 41, 59, 0.58);
  box-shadow: var(--box-shadow-lg);
  backdrop-filter: blur(1px);
  transition:
    border-color 120ms ease,
    background 120ms ease;
}

.polyomino-piece-pickup.is-snapping::before {
  border-color: #86efac;
  background: rgba(20, 83, 45, 0.3);
}

.polyomino-piece-pickup.is-dragging::before {
  background: rgba(30, 41, 59, 0.38);
}

.polyomino-piece-pickup-surface {
  position: absolute;
  inset: 2.75rem;
  z-index: 1;
  display: grid;
  place-items: center;
  cursor: grab;
  touch-action: none;
  pointer-events: auto;
}

.polyomino-piece-pickup-surface:active {
  cursor: grabbing;
}

.polyomino-piece-actions {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  transition: opacity 100ms ease;
}

.polyomino-piece-actions[hidden] {
  display: none;
}

.polyomino-piece-actions button {
  position: absolute;
  width: 2.75rem;
  min-width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  padding: 0;
  border-radius: 50%;
  color: var(--text);
  border: 2px solid rgba(226, 232, 240, 0.7);
  background: rgba(148, 163, 184, 0.8);
  box-shadow: var(--box-shadow);
  pointer-events: auto;
}

.polyomino-piece-actions button:hover,
.polyomino-piece-actions button:focus-visible {
  color: white;
  border-color: #fef08a;
  background: rgba(71, 85, 105, 0.96);
}

.polyomino-piece-actions [data-polyomino-rotate] {
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
}

.polyomino-piece-actions [data-polyomino-rotate-anticlockwise] {
  top: 50%;
  left: 0;
  transform: translate(-50%, -50%);
}

.polyomino-piece-actions [data-polyomino-flip] {
  top: 50%;
  right: 0;
  transform: translate(50%, -50%);
}

.polyomino-piece-actions [data-polyomino-flip-vertical] {
  bottom: 0;
  left: 50%;
  transform: translate(-50%, 50%);
}

.polyomino-piece-actions [data-polyomino-return] {
  top: 14.65%;
  right: 14.65%;
  transform: translate(50%, -50%);
}

.polyomino-piece-actions svg {
  width: 1.5rem;
  height: 1.5rem;
}

.polyomino-piece-pickup.is-dragging .polyomino-piece-actions {
  opacity: 0;
  pointer-events: none;
}

.polyomino-piece-pickup.is-dragging .polyomino-piece-actions button {
  pointer-events: none;
}

.polyomino-mini-shape {
  display: grid;
  gap: 0;
  place-self: center;
  opacity: 1;
  filter: none;
  transform: scale(1);
  transform-box: border-box;
  transform-origin: center;
  transition:
    opacity 160ms ease,
    filter 160ms ease,
    transform 160ms ease;
}

.polyomino-puzzle[data-piece-puzzle-mode='solve-selection']
  .polyomino-piece:not(.is-solve-selected)
  .polyomino-mini-shape {
  opacity: 0.72;
  filter: brightness(0.78) saturate(0.75);
}

.polyomino-puzzle[data-piece-puzzle-mode='solve-selection']
  .polyomino-piece.is-solve-selected
  .polyomino-mini-shape {
  opacity: 1;
  filter: none;
  transform: scale(1.06);
}

.polyomino-puzzle[data-piece-puzzle-mode='solve-selection'] .polyomino-mini-shape {
  pointer-events: none;
}

.polyomino-mini-cell {
  width: 0.8rem;
  height: 0.8rem;
  border: 1px solid var(--puzzle-mini-cell-edge);
  border-radius: 1px;
  background: var(--piece-color);
  box-shadow: none;
}

.polyiamond-puzzle .polyomino-mini-shape {
  display: block;
  max-width: none;
  overflow: visible;
}

.polyiamond-puzzle .polyiamond-mini-cell {
  fill: var(--piece-color);
  stroke: var(--puzzle-mini-cell-edge);
  stroke-width: 1px;
  vector-effect: non-scaling-stroke;
}

.polyomino-solve-movement-layer {
  position: fixed;
  inset: 0;
  z-index: 1100;
  overflow: visible;
  pointer-events: none;
}

@keyframes polyomino-solve-piece-move {
  from {
    opacity: 0.94;
    transform: translate(var(--solve-piece-from-x), var(--solve-piece-from-y))
      scale(var(--solve-piece-from-scale));
  }

  78% {
    opacity: 1;
  }

  to {
    opacity: 1;
    transform: translate(0, 0) scale(var(--solve-piece-to-scale));
  }
}

.polyomino-solve-moving-piece {
  position: absolute;
  display: grid;
  place-items: center;
  transform-box: border-box;
  transform-origin: center;
  animation: polyomino-solve-piece-move 460ms cubic-bezier(0.2, 0.72, 0.2, 1)
    var(--solve-piece-delay) both;
  will-change: opacity, transform;
}

.polyomino-solve-moving-shape {
  max-width: none;
  pointer-events: none;
  transition: none;
  filter: drop-shadow(0 0.45rem 0.5rem rgba(2, 6, 23, 0.5));
}

.polyomino-piece.is-solve-return-arriving .polyomino-mini-shape {
  visibility: hidden;
}

.polyomino-picked-shape {
  position: relative;
  z-index: 1;
  place-self: center;
  max-width: none;
  transform-box: border-box;
  transform-origin: center;
  filter: drop-shadow(0 0.4rem 0.45rem rgba(2, 6, 23, 0.48));
}

@keyframes polyomino-picked-shape-transform {
  from {
    transform: var(--piece-transform-from);
  }

  to {
    transform: none;
  }
}

.polyomino-picked-shape.is-transforming {
  animation: polyomino-picked-shape-transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
  will-change: transform;
}

.polyomino-puzzle-status {
  min-height: 1.5rem;
}

.polyomino-puzzle-status.error {
  color: #fca5a5;
}