:root{
    --button-size-width: 55px;
    --button-size-height: 55px;
    --gap: 5px;

    --main-color: #2D2C2C;
    --secondary-color:#403E3B;
    --additional-color: #EF871F;
    --font-color: #E1DFDC;

    --hueMainColor: 0;
    --satMainColor: 1%;
    --lightMainColor: 17%;

    --hueSecondaryColor: 36;
    --satSecondaryColor: 4%;
    --lightSecondaryColor: 24%;

    --hueAdditionalColor: 30;
    --satAdditionalColor: 86%;
    --lightAdditionalColor: 53%;
}

button{
    color: inherit;
}

.app-wrap {
    margin: 0 auto;
    width: 98%;
    max-width: 1140px;
    margin-top: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    gap: 20px;
    color: var(--font-color);
}

.field {
    display: flex;
    gap: var(--gap);
    flex-direction: column;
    padding: 10px;
    background-color: #212120;
    width: calc(4 * var(--button-size-width));
    border: var(--main-color) 2px solid;
    border-radius: 15px;
}

.result-field {
    width: 100%;
    box-sizing: border-box;
    text-align: right;
    font-size: 2rem;
    background-color: var(--main-color);
    color: var(--font-color);
    border: black 2px solid;
    border-radius: 6px;
}

.buttons-wrap {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: var(--gap);
    align-items: center;
    width: 100%;
}

.main-block-wrap{
    display: flex;
    flex-wrap: wrap;
    gap: var(--gap);
    width: 75%;
}

.number-buttons-wrap {
    display: grid;
    gap: var(--gap);
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(4, 1fr);
    width: 100%;
    align-items: stretch;
    justify-items: stretch;
}

.last-button{
    display: block;
    grid-column: 1/3;
    grid-row: 4;
    width: 100%;
}

.operations-block-wrap {
    display: flex;
    flex-wrap: wrap;
    width: var(--button-size-width);
    gap: var(--gap);
}

.arithmetic-buttons-wrap{
    display: flex;
    flex-wrap: wrap;
    gap: var(--gap);
    justify-content: flex-start;
}

.calculator-button {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0;
    font-size: 1.8em;
    height: var(--button-size-height);
    width: 100%;
    border: black 2px solid;
    border-radius: 6px;
    cursor: pointer;
    box-shadow:
        inset 0 -2px 0 rgba(0, 0, 0, 0.4), 
        0 2px 4px rgba(0, 0, 0, 0.5);     
    transition: all 0.1s ease-in-out;
}

.calculator-button:active {
    box-shadow:
        inset 0 2px 0 rgba(0, 0, 0, 0.4), 
        0 1px 2px rgba(0, 0, 0, 0.2);     
    transform: translateY(1px);        
}

.calculator-button:hover {
    filter: brightness(85%);
}

.functional-buttons-wrap{
    display: flex;
    width: 100%;
    gap: var(--gap);
}

.functional-button {
    background: linear-gradient(to bottom,
        hsl(var(--hueMainColor), var(--satMainColor), calc(var(--lightMainColor) + 5%)),
        hsl(var(--hueMainColor), var(--satMainColor), var(--lightMainColor))
        );
}

.number-button {
    background: linear-gradient(to bottom,
        hsl(var(--hueSecondaryColor), var(--satSecondaryColor), calc(var(--lightSecondaryColor) + 5%)),
        hsl(var(--hueSecondaryColor), var(--satSecondaryColor), var(--lightSecondaryColor))
        );
}

.arithmetic-button {
    background-color: var(--additional-color);
}

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