#toc {
	display: grid; list-style-type: none;
	grid-template-rows: repeat(3, 1fr);
	grid-template-columns: repeat(4, 1fr);
	grid-auto-flow: column;
	margin: 0; padding: 0;
}
#toc li {
	margin: 0; padding: 0 0.5em; list-style-type: none;
	text-indent: 0; display: block;
	border-left: 1px solid #ede;
}

@media (orientation: portrait) {
	#toc {
		grid-template-columns: repeat(2, 1fr);
		grid-template-rows: repeat(6, 1fr);
	}
	#toc li {
		padding: 0.5em;
	}
}