/*
 * Uses the --ls-* custom properties from reading-theme.css when present
 * (i.e. on an actual chapter page); falls back to sane neutrals so the
 * block doesn't look broken anywhere else it might get placed.
 */
.q52-ls-chapter-nav {
	--_ls-text: var(--ls-text, #2a2418);
	--_ls-muted: var(--ls-text-muted, #6b5f48);
	--_ls-accent: var(--ls-accent, #8a2418);
	--_ls-border: var(--ls-border, rgba(42, 36, 24, 0.16));
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
	color: var(--_ls-text);
}

.q52-ls-chapter-nav__prevnext {
	display: flex;
	gap: 1rem;
	border-top: 1px solid var(--_ls-border);
	border-bottom: 1px solid var(--_ls-border);
	padding: 0.9rem 0;
}

.q52-ls-chapter-nav__link,
.q52-ls-chapter-nav__link:visited {
	flex: 1 1 0;
	display: flex;
	flex-direction: column;
	gap: 0.25em;
	text-decoration: none;
	color: var(--_ls-text);
	padding: 0.5em 0.75em;
	border-radius: 4px;
}

.q52-ls-chapter-nav__link--next {
	text-align: right;
	align-items: flex-end;
}

.q52-ls-chapter-nav__link--disabled {
	color: var(--_ls-muted);
	opacity: 0.45;
}

.q52-ls-chapter-nav__link:not(.q52-ls-chapter-nav__link--disabled):hover {
	background: rgba(127, 127, 127, 0.08);
}

.q52-ls-chapter-nav__dir {
	font-size: 0.68rem;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--_ls-accent);
}

.q52-ls-chapter-nav__title {
	font-size: 0.88rem;
	color: var(--_ls-text);
}

.q52-ls-chapter-nav__browser {
	margin-top: 0.75rem;
}

.q52-ls-chapter-nav__summary {
	cursor: pointer;
	font-size: 0.8rem;
	letter-spacing: 0.03em;
	color: var(--_ls-muted);
	padding: 0.5em 0;
	list-style: none;
}

.q52-ls-chapter-nav__summary::-webkit-details-marker {
	display: none;
}

.q52-ls-chapter-nav__summary::before {
	content: "▸ ";
	display: inline-block;
	transition: transform 0.15s ease;
}

details[open] > .q52-ls-chapter-nav__summary::before {
	transform: rotate(90deg);
}

.q52-ls-chapter-nav__list {
	list-style: none;
	margin: 0.5em 0 0;
	padding: 0;
	max-height: 22em;
	overflow-y: auto;
	border: 1px solid var(--_ls-border);
	border-radius: 4px;
}

.q52-ls-chapter-nav__item + .q52-ls-chapter-nav__item {
	border-top: 1px solid var(--_ls-border);
}

.q52-ls-chapter-nav__item-link,
.q52-ls-chapter-nav__item-link:visited {
	display: flex;
	align-items: baseline;
	gap: 0.6em;
	padding: 0.5em 0.75em;
	text-decoration: none;
	color: var(--_ls-text);
	font-size: 0.85rem;
}

a.q52-ls-chapter-nav__item-link:hover {
	background: rgba(127, 127, 127, 0.08);
}

.q52-ls-chapter-nav__item--current .q52-ls-chapter-nav__item-link {
	background: rgba(138, 36, 24, 0.08);
	font-weight: 600;
}

.q52-ls-chapter-nav__item-num {
	font-variant-numeric: tabular-nums;
	color: var(--_ls-accent);
	min-width: 1.6em;
}

.q52-ls-chapter-nav__item-title {
	flex: 1 1 auto;
	color: var(--_ls-text);
}

.q52-ls-chapter-nav__item-thread {
	font-size: 0.72rem;
	color: var(--_ls-muted);
	white-space: nowrap;
}

@media (max-width: 480px) {
	.q52-ls-chapter-nav__prevnext {
		flex-direction: column;
	}
	.q52-ls-chapter-nav__link--next {
		text-align: left;
		align-items: flex-start;
	}
	.q52-ls-chapter-nav__item-thread {
		display: none;
	}
}