/* Sudoku */

.sd-stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.85rem;
    user-select: none;
}

.sd-hud {
    display: flex;
    gap: 1.25rem;
    font-weight: 600;
    color: var(--color-text-light);
    font-variant-numeric: tabular-nums;
}

.sd-board {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    width: min(460px, 92vw);
    aspect-ratio: 1;
    border: 3px solid var(--color-text);
    border-radius: 4px;
    background: var(--color-card-bg);
    overflow: hidden;
}

.sd-cell {
    border: 1px solid var(--color-border);
    background: var(--color-card-bg);
    font-size: clamp(1rem, 4.4vw, 1.5rem);
    font-weight: 600;
    color: var(--cat-speed);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: transparent;
    position: relative;
}

/* Box seams. Drawn as thicker cell borders so they scale with the board. */
.sd-box-right { border-right: 3px solid var(--color-text); }
.sd-box-bottom { border-bottom: 3px solid var(--color-text); }

/* Givens are the puzzle; entries are the player's, so they read differently. */
.sd-cell.given {
    color: var(--color-text);
    background: var(--color-bg-secondary);
    cursor: default;
}

.sd-cell.entered { color: var(--cat-speed); }

.sd-cell.wrong {
    color: var(--color-accent);
    background: #ffe9e9;
}

.sd-cell.peer { background: var(--color-bg); }
.sd-cell.given.peer { background: var(--color-bg-secondary); }

/* Matching digits across the grid, which is how you scan for a number. */
.sd-cell.same-value {
    background: #fff2c2;
    box-shadow: inset 0 0 0 2px var(--color-primary-dark);
}

.sd-cell.selected {
    background: var(--color-primary);
    box-shadow: inset 0 0 0 3px var(--color-primary-dark);
}

.sd-cell:focus-visible {
    outline: 3px solid var(--color-text);
    outline-offset: -3px;
}

/* Pencil marks: a 3x3 micro-grid inside the cell. */
.sd-notes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    width: 100%;
    height: 100%;
    font-size: 0.5em;
    font-style: normal;
    font-weight: 500;
    color: var(--color-text-light);
    line-height: 1;
}

.sd-notes i {
    font-style: normal;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sd-pad {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 4px;
    width: min(460px, 92vw);
}

.sd-num {
    aspect-ratio: 1;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--color-primary);
    color: var(--color-text);
    font-size: clamp(0.95rem, 3.6vw, 1.25rem);
    font-weight: 700;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.sd-num:hover { background: var(--color-primary-dark); }
.sd-num:focus-visible {
    outline: 3px solid var(--color-text);
    outline-offset: 2px;
}

.sd-actions,
.sd-levels {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.sd-btn,
.sd-level {
    padding: 0.55rem 1.1rem;
    font-size: 0.95rem;
    font-weight: 600;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-card-bg);
    color: var(--color-text);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.sd-btn:hover,
.sd-level:hover { border-color: var(--color-primary-dark); }

.sd-btn:focus-visible,
.sd-level:focus-visible {
    outline: 3px solid var(--color-text);
    outline-offset: 2px;
}

.sd-btn.active,
.sd-level.active {
    background: var(--color-primary);
    border-color: var(--color-primary-dark);
}

.sd-feedback {
    min-height: 1.4em;
    margin: 0;
    font-weight: 600;
    color: var(--color-text-light);
    text-align: center;
}