#main-nav {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 40;
	display: flex;
	justify-content: space-between;
	align-items: flex-start;
	padding-inline: 1em;
	/* padding-top: 0.2em; */
	background: transparent;
	user-select: none;
	/* Only holds the (non-interactive) page title now that the burger
	   lives outside of it — without this its box (sized to the large
	   title font) sits above the mega menu and blocks clicks on the
	   first link even while the title itself is invisible. */
	pointer-events: none;
}

.nav-site-title {
	font-size: var(--nav-scale);
	line-height: 1;
	letter-spacing: -0.04em;
	font-weight: 400;
	opacity: 1;
	transition: opacity 0.2s ease;
}

.nav-site-title.is-hidden {
	opacity: 0;
	pointer-events: none;
}

.nav-burger {
	--burger-w: calc(var(--nav-scale) * 0.75);
	--burger-h: calc(var(--nav-scale) * 0.55);
	--burger-gap: calc(var(--nav-scale) * 0.5);

	position: fixed;
	z-index: 41;
	top: calc(var(--burger-gap) / 1.5);
	right: calc(var(--burger-gap) / 1.5);

	width: var(--burger-w);
	height: var(--burger-h);
	background: none;
	border: none;
	cursor: pointer;
}

.nav-burger span {
	position: absolute;
	left: 0;
	width: 100%;
	height: calc(var(--burger-h) * 0.125);
	background: #000;
	transition:
		transform 0.3s ease,
		opacity 0.3s ease,
		top 0.3s ease;
}

.nav-burger span:nth-child(1) {
	top: 0;
}

.nav-burger span:nth-child(2) {
	top: calc(var(--burger-h) * 0.357);
}

.nav-burger span:nth-child(3) {
	top: calc(var(--burger-h) * 0.714);
}

.nav-burger.open span:nth-child(1) {
	top: calc(var(--burger-h) * 0.428);
	transform: rotate(45deg);
}

.nav-burger.open span:nth-child(2) {
	opacity: 0;
}

.nav-burger.open span:nth-child(3) {
	top: calc(var(--burger-h) * 0.428);
	transform: rotate(-45deg);
}