.puzzle-grid {
    display: grid;
    --grid-gap: 6px;
    gap: var(--grid-gap);
    width: max-content;
    max-width: 100%;
    margin: 0 auto 16px;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
}

.puzzle-grid.solved {
    border-radius: 14px;
    animation: solved-board-glow 900ms ease-out both;
    box-shadow:
        0 0 0 3px rgb(37 180 107 / 18%),
        0 0 24px rgb(37 180 107 / 20%);
}

.puzzle-grid.solved .cell.cloud,
.puzzle-grid.solved .cell.cloud-rectangle {
    box-shadow: inset 0 0 0 1px rgb(255 255 255 / 36%);
}

.cell,
.clue,
.corner {
    width: var(--cell-size, 56px);
    height: var(--cell-size, 56px);
    border-radius: 10px;
    display: grid;
    place-items: center;
    font-weight: 700;
}

.cell {
    border: 1px solid var(--color-board-cell-border);
    background: var(--color-board-cell);
    cursor: pointer;
    font-size: 24px;
    -webkit-user-drag: none;
}

.cell:hover {
    background: var(--color-surface-muted);
}

.cell.cloud {
    background: var(--color-board-cloud);
    border-color: var(--color-accent-blue);
}

.cell.cloud-rectangle {
    background: var(--cloud-rectangle-background);
    border-color: color-mix(in srgb, var(--cloud-rectangle-background) 72%, var(--color-primary));
}

.cell.cloud-invalid {
    background: var(--color-surface-muted);
    border-color: var(--color-text-secondary);
}

.cell.empty {
    background: var(--color-board-empty);
    color: var(--color-board-empty-icon);
}

.clue {
    background: var(--color-clue-unsatisfied);
    color: var(--color-clue-text);
}

.clue.complete {
    background: var(--color-clue-satisfied);
}

.clue.invalid {
    background: var(--color-clue-invalid);
}

.clue.issue {
    outline: 3px solid var(--color-warning);
    outline-offset: 2px;
}

.corner {
    background: transparent;
}

.cell-icon {
    display: inline-flex;
    width: 14px;
    height: 14px;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
}

.fill-icon {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    background: currentColor;
}

.empty-icon {
    position: relative;
}

.empty-icon::before,
.empty-icon::after {
    content: "";
    position: absolute;
    width: 12px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
}

.empty-icon::before {
    transform: rotate(45deg);
}

.empty-icon::after {
    transform: rotate(-45deg);
}

@keyframes solved-board-glow {
    0% {
        box-shadow:
            0 0 0 0 rgb(37 180 107 / 0%),
            0 0 0 rgb(37 180 107 / 0%);
    }

    45% {
        box-shadow:
            0 0 0 4px rgb(37 180 107 / 24%),
            0 0 30px rgb(37 180 107 / 28%);
    }

    100% {
        box-shadow:
            0 0 0 3px rgb(37 180 107 / 18%),
            0 0 24px rgb(37 180 107 / 20%);
    }
}

@media (prefers-reduced-motion: reduce) {
    .puzzle-grid.solved {
        animation: none;
    }
}