/* Floating TOC — fixed bottom-left */
#ftoc-nav.ftoc-nav {
	position: fixed;
	left: 20px;
	bottom: 20px;
	z-index: 9999;
	max-width: 320px;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
	font-size: 14px;
	line-height: 1.5;
	background: #fff;
	border: 1px solid #ddd;
	border-radius: 8px;
	box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
	overflow: hidden;
	transition: box-shadow 0.2s ease;
}

#ftoc-nav.ftoc-nav:hover,
#ftoc-nav.ftoc-nav.ftoc-open {
	box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

#ftoc-nav[hidden] {
	display: none;
}

/* Header — always visible */
#ftoc-nav .ftoc-header {
	display: flex;
	align-items: center;
	gap: 8px;
	padding: 10px 14px;
	cursor: pointer;
	user-select: none;
	background: #f7f7f7;
	border-bottom: 1px solid transparent;
}

#ftoc-nav.ftoc-open .ftoc-header {
	border-bottom-color: #eee;
}

#ftoc-nav .ftoc-toggle-icon {
	flex-shrink: 0;
	width: 18px;
	height: 18px;
	fill: #555;
	transition: transform 0.2s ease;
}

#ftoc-nav.ftoc-open .ftoc-toggle-icon {
	transform: rotate(180deg);
}

#ftoc-nav .ftoc-current-title {
	flex: 1;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
	color: #333;
	font-weight: 600;
}

/* List panel */
#ftoc-nav .ftoc-list-wrap {
	max-height: 0;
	overflow: hidden;
	transition: max-height 0.3s ease;
}

#ftoc-nav.ftoc-open .ftoc-list-wrap {
	max-height: 60vh;
	overflow-y: auto;
}

#ftoc-nav .ftoc-list {
	list-style: none;
	margin: 0;
	padding: 8px 0;
}

#ftoc-nav .ftoc-list li {
	margin: 0;
	padding: 0;
}

#ftoc-nav .ftoc-list a {
	display: block;
	padding: 5px 14px;
	color: #555;
	text-decoration: none;
	border-left: 3px solid transparent;
	transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

#ftoc-nav .ftoc-list a:hover {
	background: #f5f5f5;
	color: #111;
}

#ftoc-nav .ftoc-list a.ftoc-active {
	color: #0073aa;
	border-left-color: #0073aa;
	font-weight: 600;
	background: #f0f6fc;
}

/* Multi-level indent */
#ftoc-nav .ftoc-list a[data-level="3"] {
	padding-left: 28px;
}

#ftoc-nav .ftoc-list a[data-level="4"] {
	padding-left: 42px;
}

/* Desktop: hover to expand */
@media (min-width: 769px) {
	#ftoc-nav.ftoc-nav:hover .ftoc-list-wrap {
		max-height: 60vh;
		overflow-y: auto;
	}

	#ftoc-nav.ftoc-nav:hover .ftoc-toggle-icon {
		transform: rotate(180deg);
	}

	#ftoc-nav.ftoc-nav:hover .ftoc-header {
		border-bottom-color: #eee;
	}
}

/* Mobile: rely on .ftoc-open class toggled by click */
@media (max-width: 768px) {
	#ftoc-nav.ftoc-nav {
		left: 12px;
		bottom: 12px;
		max-width: calc(100vw - 24px);
		font-size: 13px;
	}
}