@import '../../common/variables.less';

@subcategory-indent: 8px;

.sidebar-toc {
	width: 200px;
	max-height: 90vh;
	overflow: auto;
	padding: 12px 12px 12px 26px;
	float: left;
	position: sticky;
	top: calc( @height-sticky-header + 1.5em );
	background-color: @background-color-base;
	border: @border-base;
	border-radius: @border-radius-base;

	.sidebar-toc-header {
		padding-bottom: 12px;
	}

	.sidebar-toc-title {
		font-weight: bold;
		font-size: @font-size-heading-3;
		margin: 0;
		padding: 0;
		border: 0;
	}

	.sidebar-toc-link > * {
		// Prevent click events on the link's contents so that we can use event
		// delegation and have the target be the anchor element instead.
		pointer-events: none;
	}

	.sidebar-toc-numb {
		display: none;
	}

	.sidebar-toc-text {
		padding-bottom: 5px;
	}

	#table-of-contents,
	.sidebar-toc-list {
		margin: 0;
		list-style: none;
		line-height: 18px;
	}

	.sidebar-toc-list-item {
		display: block;
		position: relative;
		list-style-type: none;
		padding-left: @subcategory-indent;

		a {
			color: @color-base;
			font-size: @font-size-base;
		}
	}

	.sidebar-toc-list-item.sidebar-toc-level-1 {
		padding-left: 0;

		& > a {
			color: @color-link;
		}
	}
}

// Hide TOC when sidebar is open
.mw-checkbox-hack-checkbox:checked ~ .mw-workspace-container .sidebar-toc {
	display: none;
}

// Highlight active section
.sidebar-toc .sidebar-toc-list-item-active > .sidebar-toc-link {
	font-weight: bold;
}

// For no-js users, toggling is disabled and icon is hidden
.sidebar-toc .sidebar-toc-toggle {
	display: none;
}

// Collapse ToC sections by default, excluding no-js or prefers-reduced-motion
@media ( prefers-reduced-motion: no-preference ) {
	.client-js .sidebar-toc {
		.sidebar-toc-level-1 .sidebar-toc-list-item {
			display: none;
		}

		.sidebar-toc-level-1.sidebar-toc-list-item-expanded .sidebar-toc-list-item {
			display: block;
		}

		.sidebar-toc-toggle {
			position: absolute;
			font-size: 0.7em; // reduces size of toggle icon (by an arbitrary amount)
			top: 4px; // visually center icon (at least at default font size)
			left: -18px;
			transform: rotate( -90deg );
		}

		.sidebar-toc-level-1 > .sidebar-toc-toggle {
			display: block;
		}

		.sidebar-toc-level-1 > .sidebar-toc-list:empty + .sidebar-toc-toggle {
			display: none;
		}

		.sidebar-toc-level-1.sidebar-toc-list-item-expanded .sidebar-toc-toggle {
			transform: rotate( 0deg );
		}
	}
}