#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;
}

/* `tree` style toc */
#toc nav > ol {
	margin-left: 1rem;
}

#toc ol {
	margin: 0;
}

#toc li {
	position: relative;
	padding-inline-start: 1em;
	list-style: none;
	margin-block: 0;
	margin-left: .35rem;
}

#toc li::before,
#toc li::after {
	display: block;
	position: absolute;
	box-sizing: border-box;
	inset-block: 0 auto;
	inset-inline: 0 auto;
	inline-size: .75em;
	border-inline-start: .1rem solid var(--color-pink);
}

#toc li::before {
	block-size: .5lh;
	border-block-end: .1rem solid var(--color-pink);
	content: "";
}

#toc li:not(:last-child)::after {
	block-size: 100%;
	content: "";
}

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

#toc a:focus-visible {
	outline-color: var(--color-pink);
}