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

.vector-toc {
	max-height: 75vh;
	box-sizing: border-box;
	overflow-y: auto;
	overflow-x: hidden;
	background-color: @background-color-page-container;

	.vector-feature-page-tools-disabled & {
		padding: @padding-top-tabs 12px 20px 27px;

		.vector-toc-pinnable-header {
			// Override default pinnable header styles
			padding: 0 0 12px 0;
			border: 0;
			line-height: initial;
		}
	}

	.vector-pinnable-header-label {
		// Override heading element styles in elements.less
		overflow: unset;
	}

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

	.vector-toc-toggle {
		// For no-js users, toggling is disabled and icon is hidden
		display: none;
		position: absolute;
		top: 1px; // visually center icon
		left: ~'calc( -1 * @{size-toc-subsection-toggle-icon} - 1px )'; // leaves 6px between icon + text
		width: @size-toc-subsection-toggle-icon; // ~22px @ 12
		height: @size-toc-subsection-toggle-icon;
		font-size: 0.75em; // reduces size of toggle icon to 12px @ 16
		transition: @transition-duration-base;
		color: transparent;
		cursor: pointer;

		.vector-feature-page-tools-enabled & {
			// Vertically center the icon with the text
			margin-top: 2px;
		}
	}

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

	// 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
			color: @color-base;
			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-item} )';
			}
		}
	}

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

	.vector-toc-text {
		.vector-feature-page-tools-disabled & {
			padding: 4px 0;
		}

		.vector-feature-page-tools-enabled & {
			// 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-feature-page-tools-disabled & {
			line-height: 18px;
		}
	}

	.vector-toc-list-item {
		display: block;
		position: relative;
		list-style-type: none;
		padding-left: 8px;

		.vector-feature-page-tools-enabled & {
			margin: 0;
		}

		&.vector-toc-level-1 {
			padding-left: 0;
		}

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

// 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-disabled body:not( .vector-sticky-header-visible ) .vector-page-titlebar &,
	.vector-feature-toc-pinned-disabled .vector-sticky-header-visible .vector-sticky-header &,
	.vector-feature-toc-pinned-enabled .mw-table-of-contents-container& {
		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-tablet ) {
		.client-js .vector-page-titlebar & {
			display: block;
		}

		.client-js .mw-table-of-contents-container& {
			display: none;
		}
	}
}