/* Sudoku specific styles */

/* Center align Difficulty Level option group */
.options .option-group {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
}

.options .option-group h2 {
    text-align: center;
    width: 100%;
    margin-bottom: 1rem;
    margin-top: 0;
}

.options .option-group .case-options {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* Sudoku Grid Styles */
.sudoku-grid {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    grid-template-rows: repeat(9, 1fr);
    gap: 0;
    border: 2px solid #000;
    width: 100%;
    max-width: 600px;
    margin-top: 20mm;
    margin-left: auto;
    margin-right: auto;
    aspect-ratio: 1;
    box-shadow: none !important;
    outline: none !important;
    border-collapse: collapse;
}

.sudoku-cell {
    border: none;
    border-right: 1px solid #666;
    border-bottom: 1px solid #666;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20pt;
    font-weight: bold;
    background: white !important;
    min-height: 45px;
    box-sizing: border-box;
    color: #000;
    box-shadow: none !important;
    outline: none !important;
    margin: 0 !important;
    padding: 0 !important;
}

/* Remove right border for last column */
.sudoku-cell:nth-child(9n) {
    border-right: none;
    background: white !important;
}

/* Remove bottom border for last row */
.sudoku-cell:nth-child(n+73) {
    border-bottom: none;
    background: white !important;
}

/* Thicker borders for 3x3 boxes - every 3rd column (columns 3, 6) */
.sudoku-cell:nth-child(3n):not(:nth-child(9n)) {
    border-right: 2px solid #000;
    background: white !important;
}

/* Thicker borders for 3x3 boxes - every 3rd row (rows 3, 6) */
.sudoku-cell:nth-child(n+19):nth-child(-n+27),
.sudoku-cell:nth-child(n+46):nth-child(-n+54) {
    border-bottom: 2px solid #000;
    background: white !important;
}

/* Given numbers (pre-filled) */
.sudoku-cell.given {
    color: #000 !important;
    font-weight: bold;
    background: white !important;
}

/* User input numbers (empty cells) */
.sudoku-cell.empty {
    color: #000 !important;
    background: white !important;
}

/* Answer numbers (when showing answers) */
.sudoku-cell.answer {
    color: #ff4444 !important;
    font-weight: bold;
    background: white !important;
}

/* Print Styles */
@media print {
    .sudoku-grid {
        max-width: 600px !important;
        margin: 20mm auto 0 auto !important;
        border: 2px solid #000 !important;
        box-shadow: none !important;
    }

    .sudoku-cell {
        font-size: 20pt !important;
        min-height: 45px !important;
        background: white !important;
        color: #000 !important;
        border-right: 1px solid #666 !important;
        border-bottom: 1px solid #666 !important;
        border-top: none !important;
        border-left: none !important;
        box-shadow: none !important;
    }

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

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

    .sudoku-cell:nth-child(3n):not(:nth-child(9n)) {
        border-right: 2px solid #000 !important;
    }

    .sudoku-cell:nth-child(n+19):nth-child(-n+27),
    .sudoku-cell:nth-child(n+46):nth-child(-n+54) {
        border-bottom: 2px solid #000 !important;
    }

    .sudoku-cell.given,
    .sudoku-cell.empty,
    .sudoku-cell.answer {
        background: white !important;
    }

    .sudoku-cell.answer {
        color: #ff4444 !important;
    }

    .copyright-footer {
        position: absolute !important;
        bottom: 5mm !important;
        left: 0 !important;
        right: 0 !important;
        text-align: center !important;
        font-size: 8pt !important;
        color: #666 !important;
        padding: 0 !important;
        margin: 0 !important;
        display: block !important;
    }

    #puzzle-preview {
        padding-bottom: 15mm !important;
    }
}

/* Hide copyright footer on screen */
.copyright-footer {
    display: none;
}