html {
    box-sizing: border-box;
}

*,
*:before,
*:after {
    box-sizing: inherit;
}

* {
    padding: 0;
    margin: 0;
}

:root {

    /***** THEME 1 *****/
    /*** Background */
    --main-background: hsl(222, 26%, 31%);
    --toggle-background: hsl(223, 31%, 20%);
    --screen-background: hsl(224, 36%, 15%);

    /*** Keys */
    --blue-key-background: hsl(225, 21%, 49%);
    --blue-key-shadow: hsl(224, 28%, 35%);
    --red-key-background-toggle: hsl(6, 63%, 50%);
    --Dark-red-key-shadow: hsl(6, 70%, 34%);
    --Light-grayish-orange-key-background: hsl(30, 25%, 89%);
    --Grayish-orange-key-shadow: hsl(28, 16%, 65%);

    /*** Text */
    --Very-dark-grayish-blue: hsl(221, 14%, 31%);
    --White: hsl(0, 0%, 100%);

    /***** THEME 2 *****/
    /*** Background */
    --Light-gray-main-background: hsl(0, 0%, 90%);
    --Grayish-red-toggle-background-keypad-background: hsl(0, 5%, 81%);
    --Very-light-gray-screen-background: hsl(0, 0%, 93%);

    /*** Keys */
    --Dark-moderate-cyan-key-background: hsl(185, 42%, 37%);
    --Very-dark-cyan-key-shadow: hsl(185, 58%, 25%);
    --Orange-key-background-toggle: hsl(25, 98%, 40%);
    --Dark-orange-key-shadow: hsl(25, 99%, 27%);
    --Light-grayish-yellow-key-background: hsl(45, 7%, 89%);
    --Dark-grayish-orange-key-shadow: hsl(35, 11%, 61%);

    /*** Text */
    --Very-dark-grayish-yellow: hsl(60, 10%, 19%);
    --White-text: hsl(0, 0%, 100%);

    /***** THEME 3 *****/
    /*** Background */
    --Very-dark-violet-main-background: hsl(268, 75%, 9%);
    --Very-dark-violet-toggle-background-keypad-background: hsl(268, 71%, 12%);


    /*** Keys */
    --Dark-violet-key-background: hsl(281, 89%, 26%);
    --Vivid-magenta-key-shadow: hsl(285, 91%, 52%);
    --Pure-cyan-key-background-toggle: hsl(176, 100%, 44%);
    --Soft-cyan-key-shadow: hsl(177, 92%, 70%);
    --Very-dark-violet-key-background: hsl(268, 47%, 21%);
    --Dark-magenta-key-shadow: hsl(290, 70%, 36%);

    /*** Text */
    -Light-yellow: hsl(52, 100%, 62%);
    --Very-dark-blue: hsl(198, 20%, 13%);
    --White-text: hsl(0, 0%, 100%);

}

body {
    font-family: 'Kumbh Sans',
        sans-serif;
    background-color: var(--main-background);
    width: 100%;
    height: 100vh;
    display: flex;
}

/*** UTILITIES */

.opacity-0 {
    opacity: 0 !important;
}

.opacity-1 {
    opacity: 1 !important;
}



.buttonToggle {
    background-color: #808080 !important;
}

.buttonToggle-two {
    background-color: #483d8b !important;
}

.buttonToggle-three {
    background-color: #ff8c00 !important;
}


.total {
    display: none;
    font-size: auto;
    width: 368px;
    max-width: 368px;
    min-width: 368px;
    justify-content: end;

}

.plus {
    display: none;
    font-size: 3rem;
    animation: keyAnimation 0.2s forwards;
    transition: cubic-bezier(0.075, 0.82, 0.165, 1);


}

.minus {
    display: none;
    font-size: 3rem;
    animation: keyAnimation 0.2s forwards;
    transition: cubic-bezier(0.075, 0.82, 0.165, 1);
}

.multi {
    display: none;
    font-size: 3rem;
    animation: keyAnimation 0.2s forwards;
    transition: cubic-bezier(0.075, 0.82, 0.165, 1);
}

.div {
    display: none;
    font-size: 3rem;
    animation: keyAnimation 0.2s forwards;
    transition: cubic-bezier(0.075, 0.82, 0.165, 1);
}

.error {
    font-size: 1rem;
    display: flex;
}

@keyframes keyAnimation {
    from {
        clip-path: polygon(0 100%, 100% 100%, 100% 100%, 0% 100%);
    }

    to {

        clip-path: polygon(0 100%, 100% 100%, 100% 0, 0 0);
    }
}




/*** MAIN */
.container {
    max-width: 1440px;
    width: 95%;
    margin: 0 auto;
    display: flex;
}

.calculator {
    background-color: var(--main-background);
    margin: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    color: white;
    min-width: 400px;
    max-width: 400px;
}

.calculator-header {
    padding: 0;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.calculator-header h1 {
    font-size: 1.5rem;
}

.calculator-theme__container {
    display: flex;
    gap: 1rem;
    align-items: end;
}

.title-theme {
    text-transform: uppercase;
    font-size: 0.7rem;
    font-weight: bold;
}

.toggle-theme {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
}

.toggle-theme__numbers {
    display: flex;
    justify-content: space-between;
    padding: 0.4rem;

}

.toggle-inputs {
    display: flex;
    background-color: var(--toggle-background);
    padding: 0.2rem;
    border-radius: 0.5rem;
    gap: 0.5rem;
    cursor: pointer;
}

.toggle-input__item {
    background-color: var(--Dark-red-key-shadow);
    cursor: pointer;
    width: 1rem;
    height: 1rem;
    clip-path: circle();
}

.toggle-input--one {
    opacity: 1;
}

.toggle-input--two {
    opacity: 0;
}

.toggle-input--three {
    opacity: 0;
}

.calculator-screen {
    display: flex;
    justify-content: end;
    background-color: var(--screen-background);
    padding: 1rem 1rem;
    border-radius: 0.5rem;
    height: 64px;
}

.result {
    display: flex;
    text-align: right;
    align-items: center;
    justify-content: end;
    width: 368px;
    max-width: 368px;
    min-width: 368px;


}

.calculator-buttons {
    background-color: var(--toggle-background);
    padding: 1rem;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(5, 1fr);
    gap: 0.5rem;
    text-align: center;
    border-radius: 0.5rem;
}

.calculator__number {
    padding: 1rem;
    border-radius: 0.5rem;
    cursor: pointer;
    user-select: none;
    font-weight: bold;
    background-color: var(--White);
    color: var(--Very-dark-grayish-blue);
    font-size: 1.5rem;
    box-shadow: 0 3px 0px 0px var(--Grayish-orange-key-shadow);
}



.calculator__number--seven {
    grid-column: 1/2;
    grid-row: 1/2;
}

.calculator__number--eight {
    grid-column: 2/3;
    grid-row: 1/2;
}

.calculator__number--nine {
    grid-column: 3/4;
    grid-row: 1/2;
}

.calculator__number--delete {
    grid-column: 4/5;
    grid-row: 1/2;
    text-transform: uppercase;
    background-color: var(--blue-key-background);
    color: var(--White);
    box-shadow: 0 3px 0px var(--blue-key-shadow);
    pointer-events: none;
}

.calculator__number--four {
    grid-column: 1/2;
    grid-row: 2/3;
}


.calculator__number--five {
    grid-column: 2/3;
    grid-row: 2/3;
}

.calculator__number--six {
    grid-column: 3/4;
    grid-row: 2/3;

}

.calculator__number--plus {
    grid-column: 4/5;
    grid-row: 2/3;
    pointer-events: none;
}

.calculator__number--one {
    grid-column: 1/2;
    grid-row: 3/4;
}

.calculator__number--two {
    grid-column: 2/3;
    grid-row: 3/4;
}

.calculator__number--three {
    grid-column: 3/4;
    grid-row: 3/4;
}

.calculator__number--minus {
    grid-column: 4/5;
    grid-row: 3/4;
    pointer-events: none;
}

.calculator__number--point {
    grid-column: 1/2;
    grid-row: 4/5;
    pointer-events: none;
}

.calculator__number--zero {
    grid-column: 2/3;
    grid-row: 4/5;
}

.calculator__number--slash {
    grid-column: 3/4;
    grid-row: 4/5;
    pointer-events: none;
}

.calculator__number--cross {
    grid-column: 4/5;
    grid-row: 4/5;
    pointer-events: none;
}

.calculator__number--span-reset {
    grid-column: 1/3;
    grid-row: 5/6;
    text-transform: uppercase;
    background-color: var(--blue-key-background);
    color: var(--White);
    box-shadow: 0 3px 0px 0px var(--blue-key-shadow);
}

.calculator__number--span-equal {
    grid-column: 3/5;
    grid-row: 5/6;
    background-color: var(--red-key-background-toggle);
    color: var(--White);
    pointer-events: none;
    box-shadow: 0 3px 0px 0px var(--Dark-red-key-shadow);
}

/* Events */
.toggle-input__item:hover {
    background-color: var(--red-key-background-toggle);
}

.calculator__number:hover {
    background-color: var(--Light-grayish-orange-key-background);
}

.calculator__number--delete:hover {
    background-color: skyblue;
}

.calculator__number--span-reset:hover {
    background-color: skyblue;
}

.calculator__number--span-equal:hover {
    background-color: tomato;
}