leecat.art/css/post-toc.css

#toc {
	float: right;
	margin: 1rem 0 1.5rem 1.5rem;
	/* 23rem is the width of the words 'table of contents' in my header font */
	/* yes, it's a bit hacky */
	width: min(calc(100% - 1.5rem), 23rem);
}

@media (max-width: 850px) {
	#toc {
		float: unset;
		margin-top: 2rem;
		margin-left: .5rem;
		width: calc(100% - .5rem);
	}
}

#toc details {
	border: thick solid var(--color-pink);
	border-radius: 1rem;
	margin-top: 1rem;
	background-color: var(--color-bg);
}

#toc summary {
	position: relative;
	top: -1.5rem;
	left: -.75rem;
	width: fit-content;
	background: var(--color-bg);
	border-radius: .5rem;
	cursor: pointer;
}

#toc summary:focus-visible {
	outline: .15rem solid var(--color-teal);
}

#toc summary::marker {
	font-size: 2.35rem;
}

#toc h2 {
	margin-top: 0;
	display: inline;
	line-height: normal;
}

#toc nav {
	position: relative;
	top: -1.25rem;
}

/* my baby my child my `tree` list style */
#toc ol,
#toc li {
	margin-block: 0;
}

#toc ol {
	margin-left: 0;
	list-style: none;
}

#toc li {
	border-left: .095rem solid var(--color-pink);
	line-height: 1.2;
	margin-left: 1.5rem;
}

#toc li::before {
	content: '├─';
	color: var(--color-pink);
	position: relative;
	left: -.34rem;
}

#toc li:last-child {
	border-left-color: transparent;
}

#toc li:last-child::before {
	/* Technically, we could use this content for all of them, but doing the full
	bar for the non-last-childs keeps the border a *smidge* more consistent for
	different levels of magnification */
	content: '└─';
}

/* underlines are unnecessary in this context */
#toc a {
	text-decoration: none;
	color: var(--color-blue);
	font-weight: bold;
}