/* Bricks Table of Contents — structural styles only. Cosmetics come from element controls. */
.snark-toc {
	--snark-toc-offset: 50px;
	display: block;
}

.snark-toc[data-snark-toc-empty] {
	display: none;
}

.snark-toc__inner {
	display: flex;
	flex-direction: column;
}

.snark-toc__header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 0.5em;
}

.snark-toc--mode-collapsed .snark-toc__header,
.snark-toc--mode-scroll .snark-toc__header {
	cursor: pointer;
}

.snark-toc__title {
	margin: 0;
}

.snark-toc__toggle {
	display: inline-flex;
	align-items: center;
	padding: 0;
	margin-inline-start: auto;
	background: none;
	border: 0;
	color: inherit;
	font: inherit;
	cursor: pointer;
}

.snark-toc__icon {
	display: inline-flex;
	transition: transform 0.2s ease;
}

.snark-toc.is-expanded .snark-toc__icon {
	transform: rotate(180deg);
}

/* Height animation without measuring: grid rows 1fr <-> 0fr. */
.snark-toc__body {
	display: grid;
	grid-template-rows: 1fr;
	transition: grid-template-rows 0.3s ease;
}

.snark-toc.is-collapsed:not(.is-hover-open) .snark-toc__body {
	grid-template-rows: 0fr;
}

.snark-toc__body-inner {
	min-height: 0;
	overflow: hidden;
}

.snark-toc__scroll {
	overflow-y: auto;
	overscroll-behavior: contain;
}

.snark-toc__list {
	display: flex;
	flex-direction: column;
	margin: 0;
	padding: 0;
	list-style: none;
}

.snark-toc__list .snark-toc__list {
	padding-inline-start: 1em;
}

.snark-toc__link {
	display: inline-block;
	text-decoration: none;
	color: inherit;
}

/* Numbering */
.snark-toc--numbering-native .snark-toc__list {
	padding-inline-start: 1.5em;
}

ol.snark-toc__list {
	list-style: none;
}

.snark-toc--numbering-native ol.snark-toc__list {
	list-style: decimal;
}

.snark-toc--numbering-native ul.snark-toc__list {
	list-style: disc;
}

.snark-toc--numbering-hierarchical .snark-toc__list {
	counter-reset: snark-toc;
}

.snark-toc--numbering-hierarchical .snark-toc__item {
	counter-increment: snark-toc;
}

.snark-toc--numbering-hierarchical .snark-toc__link::before {
	content: counters(snark-toc, ".") ". ";
}

@media (prefers-reduced-motion: reduce) {
	.snark-toc__body,
	.snark-toc__icon,
	.snark-toc__link {
		transition: none !important;
	}
}

.snark-toc .screen-reader-text {
	position: absolute;
	width: 1px;
	height: 1px;
	margin: -1px;
	padding: 0;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

/* Collapsed view: previous / current / next window. The list stays open; links outside the window fold away. */
.snark-toc.snark-toc--collapse-window.is-collapsed .snark-toc__body {
	grid-template-rows: 1fr;
}

.snark-toc--collapse-window .snark-toc__link {
	display: block;
	max-height: 10em;
	overflow: hidden;
	transition: max-height 0.38s ease, opacity 0.3s ease, padding 0.38s ease, margin 0.38s ease, color 0.18s ease;
}

.snark-toc--collapse-window.is-collapsed:not(.is-hover-open) .snark-toc__link.is-out-of-window {
	max-height: 0;
	opacity: 0;
	padding-top: 0;
	padding-bottom: 0;
	margin-top: 0;
	margin-bottom: 0;
	border-top-width: 0;
	border-bottom-width: 0;
}

.snark-toc--collapse-window.is-collapsed:not(.is-hover-open) .snark-toc__item.is-out-of-window {
	padding-top: 0;
	padding-bottom: 0;
	margin-top: 0;
	margin-bottom: 0;
	list-style: none;
}

/* Default muting for the neighbours; override under Style > Links: previous / next. */
.snark-toc--collapse-window.is-collapsed .snark-toc__link.is-adjacent {
	opacity: 0.6;
}

/* Headings receive programmatic focus after a TOC click (for screen readers); no visible ring. */
.snark-toc-target:focus {
	outline: none;
}