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

html {
	font-size: 10px;
	font-family: Play, "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

header {
	width: 100%;
	height: 100vh;
	background-color: #000;
	position: relative;
}

.overlay {
	width: 100%;
	height: 100vh;
	background-color: rgba(0, 0, 0, 0.85);
	position: fixed;
	transform: scaleX(0);
	opacity: 0;
	transition: opacity 1s;
}

.menu {
	padding: 2rem 2.5rem;
	position: fixed;
	top: 1rem;
	right: 1rem;
	background-color: #fff;
	z-index: 9;
	border-radius: 3px;
	cursor: pointer;
	display: none;
}

.bar,
.bar::before,
.bar::after {
	content: "";
	position: absolute;
	width: 3rem;
	height: 2px;
	background-color: #8744ff;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	margin: auto;
	transition: all 650ms;
}

.bar::before {
	top: -2rem;
}
.bar::after {
	top: 2rem;
}

.open .bar {
	background-color: transparent;
}

.open .bar::before {
	transform: rotate(45deg);
}
.open .bar::after {
	transform: rotate(-45deg);
}

.open .bar::before,
.open .bar::after {
	top: 0;
}

nav {
	height: 6rem;
	width: 100%;
	line-height: 6rem;
	display: flex;
	justify-content: space-evenly;
	text-transform: uppercase;
	background-color: #fff;
	box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.2);
	overflow: hidden;
}

a {
	text-decoration: none;
}

.brand {
	font-size: 1.5rem;
	color: #fff;
	background-color: #8744ff;
	padding: 0 1rem;
}

nav ul {
	display: flex;
	list-style: none;
	justify-content: center;
}

.nav-link {
	font-size: 1.5rem;
	color: #8744ff;
	margin-right: 2rem;
	padding: 0 1rem;
	display: block;
	position: relative;
	transform-style: preserve-3d;
	transform-origin: top;
	transition: transform 250ms cubic-bezier(0.55, 0.55, 0.675, 0.19);
}

.nav-link:hover {
	transform: rotateX(90deg);
}

.nav-item:last-child .nav-link {
	margin-right: 0;
}

.nav-link::after {
	background-color: #8744ff;
	content: attr(data-text);
	position: absolute;
	left: 0;
	bottom: -100%;
	padding: inherit;
	color: #fff;
	transform: rotateX(-90deg);
	transform-origin: top;
}

.nav-item {
	animation: down 1s forwards;
}

/*---ANIMATIONS---*/
@keyframes up {
	from {
		transform: translateY(-100%);
		opacity: 0;
	}
	to {
		tranform: translateY(0);
		opacity: 1;
	}
}
@keyframes down {
	from {
		transform: translateY(100%);
		opacity: 0;
	}
	to {
		tranform: translateY(0);
		opacity: 1;
	}
}
/*---END ANIMATIONS---*/

/*---responsiveness---*/
@media screen and (max-width: 768px) {
	.brand {
		margin: 0 auto;
		animation: initial;
		border-radius: 100%;
		width: 10rem;
		height: 10rem;
		display: flex;
		align-items: center;
		justify-content: center;
	}

	header {
		perspective: 75rem;
		overflow: hidden;
	}

	nav {
		position: absolute;
		top: 0;
		left: 0;
		width: 30rem;
		height: 100vh;
		line-height: initial;
		flex-direction: column;
		box-shadow: none;
		text-align: center;
		transform: rotateY(180deg);
		transform-origin: top left;
		transition: transform 650ms cubic-bezier(0.55, 0.55, 0.675, 0.19);
	}

	nav ul {
		flex-direction: column;
		margin-top: -5rem;
	}

	.nav-item {
		animation: initial;
	}

	.nav-link {
		margin: 2rem 0;
	}

	header .open nav {
		transform: rotateY(0);
	}

	.menu {
		display: block;
	}

	.overlay .open {
		opacity: 1;
		transform: scaleX(1);
	}
}