hugo-theme-paradox/assets/styles/components/nav-docs.scss

/* navigation menu toggle */

.toggle-menu {
	display: none;
}

.toggle-menu:not(:checked) ~ .menu {
	display: none;
}
.toggle-menu__label {
	display: flex;
	align-items: center;
	font-weight: 900;
	gap: 0.25rem;
	text-transform: uppercase;
}

/* navigation menu */

.docs-nav {
	padding: 1em 0;
	.menu {
		margin-top: 1em;
		> li, > details summary {
			margin-bottom: 1em;
		}
	}
	details {
		margin-bottom: 1em;
	}
	summary {
		font-weight: 700;
		cursor: pointer;
		&::marker {
			content: '';
		}
	}
	.sub-menu {
		margin-left: 1em;
		display: flex;
		flex-flow: column;
		gap: 0.5rem;
		li {
			line-height: 1.5;
		}
		.sub-menu {
			margin-top: 0.5rem;
		}
		li::marker {
			content: '→ ';
		}
		.sub-menu li::marker {
			content: '↳ ';
		}
	}
	.active > a {
		font-weight: 700;
		text-decoration: none;
		color: inherit;
	}
}

/* top of menu link should show only when focused */

#menu {margin-bottom: 1em;}
#menu:not(:focus) {
	clip: rect(0 0 0 0); 
	clip-path: inset(50%);
	height: 1px;
	overflow: hidden;
	position: absolute;
	white-space: nowrap; 
	width: 1px;
}