* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'League Spartan', sans-serif;
}

input, .display {
    font-size: 32px;
}

:root {
    --body-bg: #3a4764;
    --keypad-bg: #232c43;
    --display-bg: #182034;

    --del-reset-bg: #637097;
    --del-reset-shadow: #637097;

    --equal-bg: #d03f2f;
    --equal-shadow: #d03f2f;

    --other-key-bg:#eae3dc;
    --other-key-shadow:#eae3dc;

    --display-header-color: #ffffff;
    --key-color: #444b5a;

    --equal-color: #ffffff;

    --gaps: 20px;
    --btn-gap: 15px;

    --hover-number: #ffffff;
    --hover-dr: #a2b3e1;
    --hover-equal: #f96c5b;

}

body {
    background-color: var(--body-bg);
}

.card {
    /* border: 2px solid green; */
    padding: var(--gaps);
    display: flex;
    flex-direction: column;
    gap: var(--gaps);
}
/* HEADER LAYER ATTRIBUTES */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    height: 2.5rem;
    margin-top: 20px;
}

header, .display {
    color: var(--display-header-color);
}

header .title {font-size: 28px;}

.theme {
    display: flex;
    text-align: center;
    align-items: center;
    gap: var(--gaps);
}
.slider {
    width: 80px;
    height: 30px;
    background-color: var(--keypad-bg);
    border-radius: 18px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5px 0 5px;
}

.slider button, .floater {
    border: none;
}

.slider button {
    width: 22px;
    height: 22px;
    position: relative;
    background-color: transparent;
}

.floater {
    width: 18px;
    height: 18px;
    position: absolute;
    background-color: var(--equal-bg);
    border-radius: 50%;
    transition: 0.7s;
}

.slider::before {
    content:'1 2 3';
    word-spacing: 18px;
    position: absolute;
    top: -20px;
    display: flex;
    justify-content: center;
    padding-left: 4px;
}

/* SECTIONS ATTRIBUTES */
section {    
    border-radius: 7px;
}

.display {
    height: 120px;
    background-color: var(--display-bg);
    text-align: right;
    padding: 15px 15px;
}
/* DISPLAY SCREEN CALCULATIONS!!! */
.typed {
    font-size: 1.2rem;
    height: 20px;
    /* white-space: 2px; */
    /* border: 1px solid green; */
}
.solution {
    font-size: 50px;
    /* border: 1px solid blue; */
}

.keypad {
    display: flex;
    padding: var(--gaps);
    flex-direction: column;
    background-color: var(--keypad-bg);
    gap: var(--btn-gap);
}

.keypad > span {
    display: flex;
    gap: var(--btn-gap);
}

.row input, .lastrow input{
    border-radius: 7px;
    height: 75px;
    display: flex;
    background-color: var(--other-key-bg);
    border: none;
    color: var(--key-color);
    /* box-shadow: var(--other-key-shadow); */
    box-shadow: 0px 9px 9px -8px var(--other-key-shadow);
    justify-content: center;
}

.row input{
    width: 25%;
    max-width: 10rem;
}

.lastrow input{
    width: 50%;
}

/* EDIT THE PROPERTIES OF SPECIFIC KEYS */

input[value="DEL"], input[value="RESET"] {
    background-color: var(--del-reset-bg);
    color: #ffffff;
    font-size: 1.5rem;
    box-shadow: 0px 9px 9px -8px var(--del-reset-shadow);

}
input[value="="]{
    font-size: 1.5rem;
    background-color: var(--equal-bg);
    color: var(--equal-color);
    box-shadow: 0px 9px 9px -8px var(--equal-shadow);
}

/* HOVER EFFECTS */
.number:hover {
    background-color: var(--hover-number);
}

#delete:hover, #reset:hover {
    background-color: var(--hover-dr);
}

#equal:hover {
    background-color: var(--hover-equal);
}


@media (min-width:800px) {
    :root {
        --btn-gap: 1.5rem;
        --gaps: 1.5rem;
    }
    .card {
        width: 40%;
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%)
    }

    .row input{
        height: 4rem;
    }
    
    .lastrow input{
        height: 3.5rem;
    }
}