:root {
    --dark-blue: hsl(220, 30%, 27%);
    --calc-display: hsl(218, 74%, 10%);
    --key-pad-background: hsl(218, 40%, 23%);
    --key-pad: hsl(0, 0%, 100%);
    --reset-del: hsl(221, 23%, 50%);
    --equals: hsl(358, 65%, 48%);
    --toggle-active: hsl(358, 85%, 58%);

}

* {
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
    background-color: var(--dark-blue);
}

html {
    font-size: 16px;
}


section {
    padding: 1rem 0;
}

.theme-toggle-container {
    width: 5rem;
}

.theme-toggle-container p {
    padding: 0 0 1.3rem 1rem;
}

.theme-toggle-container span {
    padding: 0 1.2rem;
}

input[type=range] {
    -webkit-appearance: none;
    width: inherit;
    background: transparent;
}

input[type=range]::-webkit-slider-runnable-track {
    height: 1rem;
    background-color: var(--calc-display);
    border-radius: 4px;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 1rem;
    width: 1rem;
    background: var(--equals);
    border-radius: 50%;
    cursor: pointer;
}

.calc-input input{
    color: var(--key-pad);
    text-align: right;
}

.display-switcher-btn {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    color: var(--key-pad);
    border: none;
    padding: .2rem;
}

.display-switcher-btn:hover {
    cursor: pointer;
}

.display-switcher-btn p {
    background-color: var(--calc-display);
    padding: .5rem;
    border-radius: .5rem;
}


[data-theme="grid"] {
    body {
        display: grid;
        align-items: center;
        justify-content: center;
    }

    .root-container {
        width: 40rem;
        height: fit-content;
        display: grid;
        grid-template-columns: 1fr;
        padding: 1rem;
        gap: 1rem;
        align-items: center;
        justify-content: center;
    }

    .calc-header {
        display: grid;
        grid-template-columns: 1fr 1fr;
        color: var(--key-pad);
        padding: 1rem;
    }

    .theme-switcher {
        display: grid;
        grid-template-columns: 1fr 1fr;
        align-content: center;
        justify-items: center;
        padding: 0 0 0 5rem;
    }

    .calc-input {
        width: 100%;
        height: 7rem;
        background-color: var(--calc-display);
        border-radius: .5rem;
        padding: 1rem;
    }

    .calc-input input {
        background-color: inherit;
        width: 100%;
        height: 100%;
        font-size: 5rem;
        border: none;
    }

    .calc-buttons {
        display: grid;
        grid-template-columns: 1fr 1fr 1fr 1fr;
        column-gap: 0;
        row-gap: 1rem;
        padding: 1rem;
        background-color: var(--key-pad-background);
        border-radius: .5rem;
        align-content: center;
        justify-items: center;

    }

    .calc-buttons button {
        font-size: 3rem;
        border: none;
        border-radius: .5rem;
        box-shadow: 0 0 .3rem .3rem var(--dark-blue);

    }

    .input-button {
        height: 6rem;
        width: 7rem;
        background-color: var(--key-pad);
    }

    .reset-button {
        grid-column: span 2;
        height: 6rem;
        width: 16rem;
        background-color: var(--reset-del);
        color: var(--key-pad);
    }

    .del-button {
        background-color: var(--reset-del);
        color: var(--key-pad);
    }

    .equals-button {
        grid-column: span 2;
        height: 6rem;
        width: 16rem;
        background-color: var(--equals);
        color: var(--key-pad);
    }
}

[data-theme="flex"] {
    body {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .root-container {
        display: flex;
        flex-direction: column;
        width: 35rem;
        padding: 1rem;
        gap: 1rem;
    }

    .calc-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        color: var(--key-pad);
        padding: 1rem;
    }

    .theme-switcher {
        display: inline-flex;
        gap: 2rem;
    }

    .calc-input {
        display: flex;
        align-items: center;
        justify-content: center;
        height: 7rem;
        background-color: var(--calc-display);
        border-radius: .5rem;
    }

    .calc-input input {
        width: 100%;
        height: 100%;
        font-size: 6rem;
        background-color: var(--calc-display);
        border: none;
    }

    .calc-buttons {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: center;
        gap: 1rem;
        background-color: var(--key-pad-background);
        border-radius: .5rem;
    }

    .calc-buttons button {
        font-size: 2.5rem;
        border: none;
        border-radius: .5rem;
        box-shadow: 0 0 .3rem .3rem var(--dark-blue);
    }

    .input-button {
        height: 5rem;
        width: 7rem;
        background-color: var(--key-pad);
    }

    .reset-button {
        height: 5rem;
        width: 15rem;
        background-color: var(--reset-del);
        color: var(--key-pad);
    }

    .del-button {
        background-color: var(--reset-del);
        color: var(--key-pad);
    }

    .equals-button {
        height: 5rem;
        width: 15rem;
        background-color: var(--equals);
    }

}