/* The game itself: the grid and its cells, and the number pad */

/* Sudoku Grid */
.sudoku-grid, .subgrid {
    display: grid;
    grid-template: repeat(3, 1fr) / repeat(3, 1fr);
    background-color: var(--background);
}

.sudoku-grid {
    margin: 0 auto;
    gap: 6px;
    padding: 10px;
    border-radius: 15px;
    box-shadow: 10px 10px 20px var(--shadow-dark), -10px -10px 20px var(--shadow-light);
}

.subgrid {
    gap: 3px;
    padding: 5px;
    border-radius: 10px;
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
}

/* Cells */
.cell {
    width: 40px;
    height: 40px;
    padding: 1px;
    font-size: 20px;
    font-weight: 500;
    text-align: center;
    border: none;
    border-radius: 10px;
    cursor: default;
    caret-color: transparent;
    color: var(--text-color);
    background-color: var(--background);
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
    transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
    appearance: textfield;
    -moz-appearance: textfield;
}

.cell {
    /* Remove spinner buttons from number input */
    &::-webkit-inner-spin-button, &::-webkit-outer-spin-button {
        -webkit-appearance: none;
    }

    /* Remove default outline, add custom focus styles */
    &:focus {
        outline: none;
        color: var(--primary) !important;
        box-shadow: inset 4px 4px 8px var(--shadow-dark), inset -4px -4px 8px var(--shadow-light);
        background-color: color-mix(in srgb, var(--shadow-dark) 20%, transparent);
    }

    /* Keyboard focus selection, add custom focus outline */
    &:focus.keyboard-selected {
        outline: 1px solid var(--primary);
    }

    /* Initial cells */
    &.initial {
        font-weight: 600;
        box-shadow: none;
    }

    /* Valid cells */
    &.valid {
        color: var(--valid);
    }

    /* Invalid cells */
    &.invalid {
        color: var(--invalid);
    }

    /* Same number cells */
    &.same-number {
        box-shadow: inset -2px 2px 5px var(--shadow-dark), inset 2px -2px 5px var(--shadow-light);
        background-color: color-mix(in srgb, var(--primary) 10%, transparent);
    }
}

/* Number Pad */
.number-pad {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 15px;
    padding: 15px;
    width: 100%;
    max-width: 440px;
    border-radius: 20px;
    background-color: var(--background);
    box-shadow: 5px 5px 10px var(--shadow-dark), -5px -5px 10px var(--shadow-light);
}

.num-btn {
    width: 100%;
    aspect-ratio: 1/1;
    font-size: 1.5rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    border-radius: 50%;

    &.erase {
        color: var(--invalid);
    }
}

/* Responsive styles */
@media (max-width: 600px) {
    .cell {
        width: 35px;
        height: 35px;
        font-size: 18px;
    }
}

@media (max-width: 400px) {
    .sudoku-grid {
        gap: 3px;
        padding: 5px;
    }

    .subgrid {
        gap: 0;
    }

    .cell {
        width: 30px;
        height: 30px;
        font-size: 16px;
    }

    .number-pad {
        gap: 8px;
        padding: 8px;
        max-width: 300px;
    }

    .num-btn {
        font-size: 1rem;
    }
}