/* =============================================================================
   SUDOKU — game-specific styles (board, cells, digit pad).
   Shared section chrome lives in games.css; site tokens come from style.css.
   ============================================================================= */

.sudoku-wrap {
    max-width: 520px;
}

/* ---------------- Board ---------------- */

.sudoku-board {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    grid-template-rows: repeat(9, 1fr);
    width: 100%;
    aspect-ratio: 1;
    background: var(--color-white);
    border: 2px solid var(--color-gray-700);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
    margin-bottom: 1rem;
}

.sudoku-cell {
    appearance: none;
    -webkit-appearance: none;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    margin: 0;
    background: var(--color-white);
    border: none;
    border-right: 1px solid var(--color-gray-200);
    border-bottom: 1px solid var(--color-gray-200);
    font-family: var(--font-family);
    font-size: clamp(1rem, 4vw, 1.5rem);
    line-height: 1;
    color: var(--color-gray-700);
    cursor: pointer;
    transition: background-color 0.1s ease;
}

/* Bold 3x3 box separators (cells are laid out row-major, 1-indexed). */
.sudoku-cell:nth-child(9n + 3),
.sudoku-cell:nth-child(9n + 6) {
    border-right: 2px solid var(--color-gray-700);
}

.sudoku-cell:nth-child(n + 19):nth-child(-n + 27),
.sudoku-cell:nth-child(n + 46):nth-child(-n + 54) {
    border-bottom: 2px solid var(--color-gray-700);
}

.sudoku-cell:nth-child(9n) {
    border-right: none;
}

.sudoku-cell:nth-child(n + 73) {
    border-bottom: none;
}

/* Cell states */

.sudoku-cell.is-given {
    background: var(--color-gray-100);
    color: var(--color-gray-900);
    font-weight: 700;
    cursor: default;
}

.sudoku-cell.is-peer {
    background: var(--color-gray-100);
}

.sudoku-cell.is-same {
    background: var(--color-gray-200);
}

.sudoku-cell.is-selected {
    background: var(--color-gray-200);
    box-shadow: inset 0 0 0 2px var(--color-primary);
}

.sudoku-cell.is-conflict {
    background: var(--color-error-bg);
    color: var(--color-error);
}

.sudoku-cell:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
}

/* Pencil notes: mini 3x3 grid inside an empty cell */

.sudoku-notes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    width: 100%;
    height: 100%;
    font-size: clamp(0.45rem, 1.5vw, 0.62rem);
    font-weight: 600;
    line-height: 1;
    color: var(--color-gray-500);
    pointer-events: none;
}

.sudoku-notes span {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ---------------- Digit pad ---------------- */

.sudoku-pad {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 0.35rem;
}

.sudoku-pad-btn {
    appearance: none;
    -webkit-appearance: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0.25rem 0.1rem;
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--border-radius-sm);
    font-family: var(--font-family);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-gray-700);
    cursor: pointer;
    transition: var(--transition);
    touch-action: manipulation;
}

.sudoku-pad-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.sudoku-pad-btn[disabled] {
    opacity: 0.35;
    cursor: default;
    pointer-events: none;
}

.sudoku-pad-count {
    font-size: 0.62rem;
    font-weight: 400;
    line-height: 1;
    color: var(--color-gray-500);
    margin-top: 0.15rem;
}

.sudoku-pad-btn--erase,
.sudoku-pad-btn--notes {
    font-size: 0.88rem;
    font-weight: 600;
}

.sudoku-pad-btn--erase {
    grid-column: span 4;
}

.sudoku-pad-btn--notes {
    grid-column: span 5;
}

.sudoku-pad-btn--notes.is-active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.sudoku-pad-btn--notes.is-active .sudoku-pad-count {
    color: var(--color-white);
}

/* ---------------- Stats modal extras ---------------- */

.sudoku-best-title {
    margin: 1rem 0 0.35rem;
    font-size: 0.95rem;
    color: var(--color-gray-900);
}

.sudoku-best-list {
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.92rem;
    color: var(--color-gray-600);
}

.sudoku-best-list li {
    padding: 0.15rem 0;
}

.sudoku-best-daily {
    color: var(--color-gray-500);
    font-size: 0.85rem;
}

/* ---------------- Responsive ---------------- */

@media (max-width: 600px) {
    .sudoku-wrap {
        max-width: 100%;
    }

    .sudoku-pad {
        gap: 0.25rem;
    }

    .sudoku-pad-btn {
        min-height: 42px;
        font-size: 1rem;
    }

    .sudoku-pad-btn--erase,
    .sudoku-pad-btn--notes {
        font-size: 0.8rem;
    }
}