:root {
    --color-bg-body: #3c444c;
    --color-container-bg: #efefef;
    --color-text: #3c444c;
    --color-accent: #0065F8;
    --color-button-border: #89939e7e;
    --color-operator-bg: rgba(255, 255, 255, 0.11);
}

.darkmode {
    --color-bg-body: #efefef;
    --color-container-bg: #3c444c;
    --color-text: #ffffff;
    --color-accent: #0065F8;
    --color-button-border: #89939e7e;
    --color-operator-bg: rgba(255, 255, 255, 0.11);
}

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body {
    font-family: "Poppins", sans-serif;
    background-color: var(--color-bg-body);
}

.container {
    width: 400px;
    min-height: 600px;
    height: 750px;
    background-color: var(--color-container-bg);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 15px;
    border-radius: 25px;
}

.nav {
    display: flex;
    flex-direction: row;
    gap: 15px;
    list-style-type: none; 
    padding: 15px; 
}

.nav a {
    text-decoration: none;
    color: var(--color-text);
    font-size: 25px;
    border-bottom: var(--color-accent) solid 3px;
    padding-bottom: 2px;
}

.result {
    width: 100%;
    height: 190px;
    border-radius: 15px;
    color: var(--color-text);
    font-size: 2rem;
    text-align: right;
    padding: 20px;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    overflow-x: auto;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    column-gap: 10px;
    row-gap: 20px;  
}

button {
    width: 80px;
    height: 70px;
    background-color: var(--color-container-bg);
    border: solid var(--color-button-border) 0.5px;
    border-radius: 15px;
    font-size: 25px;
    color: var(--color-text);
}

button:hover {
    background-color: var(--color-text);
    color: var(--color-container-bg);
}

button:active {
    transform: scale(0.95);
}

.equal {
    grid-column: span 2;
    width: 100%;
    background-color: var(--color-accent);
}

.operator {
    background-color: var(--color-operator-bg);
}

#theme-switch {
    height: 50px;
    width: 50px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background-color: var(--background);
    display: flex;
    justify-content: center;
    align-items: center;
    position: fixed;
    top: 20px;
    right: 20px;
}

#theme-switch svg{
    fill: var(--text-color);
}

#theme-switch svg:last-child{
    display: none;
}

.darkmode #theme-switch svg:first-child{
    display: none;
}

.darkmode #theme-switch svg:last-child{
    display: block;
}

body,
.container,
button,
.result,
.nav a {
    transition: background-color 0.3s ease, color 0.3s ease;
}

#theme-switch {
    transition: background-color 0.3s ease;
}
#theme-switch svg {
    transition: fill 0.3s ease;
}