/* @import url('https://fonts.googleapis.com/css2?family=Fascinate&display=swap'); */

@import url('https://fonts.googleapis.com/css2?family=Roboto+Mono&display=swap');

*, *::before, ::after {
    box-sizing: border-box;
    /* font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; */
    /* font-family: 'Fascinate', cursive; */
    font-family: 'Roboto Mono', monospace;
}

body {
    padding: 0;
    margin: 0;
    background: linear-gradient(to bottom right, #40DFEF, #FFBED8);
}

h1 {
    text-align: center;
    text-transform: uppercase;
    font-size: 3rem;
    /* margin-bottom: -10px; */
    color: rgba(0, 0, 0, 0.75);
    margin: auto;
}

.theme-change {
    display: flex;
    justify-content: center;
    text-align: center;
    /* height: 50px; */
}

.theme-change > button {
    text-decoration: none;
    border: none;
    cursor: pointer;
    border-radius: 50%;
    height: 75px;
    width: 75px;
    font-size: 1.2rem;
    font-weight: 600;
    color: white;
    background-color: rgba(0, 0, 0, 0.75);
}

.theme-change > button:hover {
    background-color: rgba(255, 255, 255, .5);
    color: black;
}

.calculator-grid {
    display: grid;
    justify-content: center;
    align-content: center;
    min-height: 100vh;
    grid-template-columns: repeat(4, 5rem);
    grid-template-rows: minmax(120px, auto) repeat(5, 5rem);
}

.calculator-grid > button {
    cursor: pointer;
    font-size: 1.8rem;
    border: 1px solid white;
    outline: none;
    background-color: rgba(255, 255, 255, .75);
}

.calculator-grid > button:hover {
    background-color: rgba(255, 255, 255, .9);
}

.span-two {
    grid-column: span 2;
}

.output {
    grid-column: 1 / -1;
    background-color: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    flex-direction: column;
    padding: 10px;
    word-wrap: break-word;
    word-break: break-all;
}

.output .previous-operand {
    color: rgba(255, 255, 255, .75);
    font-size: 1.5rem;
}

.output .current-operand {
    color: white;
    font-size: 2.5rem;
}