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

:root {
	--color-bg-light: #eafbff;
	--color-bg-dark: #5290f9;
	--color-white: #fff;
	--color-primary: #5290f9;
	--color-text: #000;
	--font-family: 'Muli', sans-serif;
	--spacing-padding: 20px;
	--nav-width-collapsed: 80px;
	--nav-width-expanded: 350px;
	--icon-size: 30px;
	--icon-line-width: 20px;
	--icon-line-height: 2px;
	--transition-time: 0.6s;
	--transition-timing: linear;
}

/* Basic CSS Reset */
*,
img,
picture,
video,
canvas,
svg,
input,
button,
textarea,
select,
p,
h1,
h2,
h3,
h4,
h5,
h6 {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
	font: inherit;
	overflow-wrap: break-word;
}

body {
	background-color: var(--color-bg-light);
	background-image: linear-gradient(
		to bottom,
		var(--color-bg-light) 0%,
		var(--color-bg-light) 50%,
		var(--color-bg-dark) 50%,
		var(--color-bg-dark) 100%
	);
	font-family: var(--font-family);
	display: flex;
	align-items: center;
	justify-content: center;
	height: 100vh;
}

img,
picture,
video,
canvas,
svg {
	display: block;
	max-width: 100%;
}

nav {
	background-color: var(--color-white);
	padding: var(--spacing-padding);
	width: var(--nav-width-collapsed);
	display: flex;
	align-items: center;
	justify-content: center;
	border-radius: 3px;
	box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
	overflow: hidden;
	transition: width var(--transition-time) var(--transition-timing);
}

nav.active {
	width: var(--nav-width-expanded);
}

nav ul {
	display: flex;
	list-style: none;
	width: 0;
	transition: width var(--transition-time) var(--transition-timing);
}

nav.active ul {
	width: 100%;
}

nav ul li {
	transform: rotateY(0deg);
	opacity: 0;
	transition: transform var(--transition-time) var(--transition-timing),
		opacity var(--transition-time) var(--transition-timing);
}

nav.active ul li {
	transform: rotateY(360deg);
	opacity: 1;
}

nav ul a {
	position: relative;
	color: var(--color-text);
	text-decoration: none;
	margin: 0 10px;
}

.icon {
	background-color: var(--color-white);
	border: none;
	cursor: pointer;
	position: relative;
	height: var(--icon-size);
	width: var(--icon-size);
}

.icon .line {
	background-color: var(--color-primary);
	height: var(--icon-line-height);
	width: var(--icon-line-width);
	position: absolute;
	left: 5px;
	transition: transform var(--transition-time) var(--transition-timing);
}

.icon .line1 {
	top: 10px;
}

.icon .line2 {
	bottom: 10px;
	top: auto;
}

nav.active .icon .line1 {
	transform: rotate(-765deg) translateY(5.5px);
}

nav.active .icon .line2 {
	transform: rotate(765deg) translateY(-5.5px);
}