skins/Vector/resources/skins.vector.styles/components/TableOfContents.less
.vector-toc {
	.vector-pinnable-header {
		margin-left: @toc-list-item-padding-start;
	}

	.vector-pinnable-header-label {
		font-size: @font-size-reset; // Update font-size because the label is an <h2>
	}

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

	.vector-toc-toggle {
		// For no-js users, toggling is disabled and icon is hidden
		display: none;
		transition: @transition-duration-base;
		position: absolute;
		// Use `calc()` for negative calculation to not rely on Less, but standard CSS.
		left: calc( -1 * @size-toc-subsection-toggle / 2 );
		// Visual centering.
		top: 1px;
		// Override .cdx-button styles
		min-width: @size-toc-subsection-toggle; // ~22px @ 12
		min-height: @size-toc-subsection-toggle;
		padding: 0;
		font-size: @size-toc-subsection-toggle-icon;
	}

	.vector-toc-link {
		display: block;
		word-break: break-word;
	}

	// Highlight and bold active sections, active top sections that are unexpanded
	// and active top sections that are the only active element.
	.vector-toc-list-item-active,
	.vector-toc-level-1-active:not( .vector-toc-list-item-expanded ),
	.vector-toc-list-item-active.vector-toc-level-1-active {
		> .vector-toc-link {
			// Highlight active section
			.mixin-vector-selected-link();
			font-weight: bold;

			.vector-toc-text {
				// Increase width to prevent line wrapping due to bold text
				// Avoid applying on link element to avoid focus indicator changing size
				width: ~'calc( 100% + @{padding-horizontal-dropdown-menu} )';
			}
		}
	}

	// Highlight active top sections that contain an active section
	.vector-toc-level-1-active:not( .vector-toc-list-item-active ) > .vector-toc-link {
		.mixin-vector-selected-link();
	}

	.vector-toc-text {
		// Match .mixin-vector-dropdown-menu-item() vertical padding
		padding: @padding-vertical-dropdown-menu-item 0;
	}

	.vector-toc-contents,
	.vector-toc-list {
		margin: 0;
		list-style: none;
	}

	.vector-toc-list-item {
		position: relative;
		list-style-type: none;
		padding-left: @toc-list-item-padding-start;
		margin: 0;
	}
}

// Collapse ToC sections by default, excluding no-js
.client-js .vector-toc {
	.vector-toc-level-1 .vector-toc-list-item {
		display: none;
	}

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

	.vector-toc-toggle {
		display: block;
	}

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

.client-js body.ltr .vector-toc .vector-toc-toggle {
	transform: rotate( -90deg );
}

.client-js body.rtl .vector-toc .vector-toc-toggle {
	transform: rotate( 90deg );
}

// Ensure there is only 1 table of contents landmark at anytime
.vector-toc-landmark {
	display: none;
}

.vector-feature-toc-pinned-clientpref-0 body:not( .vector-sticky-header-visible ) .vector-page-titlebar,
.vector-feature-toc-pinned-clientpref-0 .vector-sticky-header-visible .vector-sticky-header-context-bar,
.vector-feature-toc-pinned-clientpref-1 .vector-column-start {
	.vector-toc-landmark {
		display: block;
	}
}

// On smaller viewports the TOC will always be moved to the page titlebar via JS
// regardless of the TOC pinned classes
@media ( max-width: @max-width-breakpoint-tablet ) {
	.client-js .vector-page-titlebar .vector-toc-landmark {
		display: block;
	}

	.client-js .mw-table-of-contents-container.vector-toc-landmark {
		display: none;
	}
}
