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

/**
 * Checkbox hack used by collapsed TOC on narrow viewports for no JS users.
 * Although it's display:none, the :checked state is still affected when clicking
 * the associated label.
 */
#vector-toc-collapsed-checkbox {
	display: none;
}

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

	.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
		font-size: 0.75em; // reduces size of toggle icon to 12px @ 16
		transition: @transition-duration-base;
		color: transparent;
		cursor: pointer;
		// Vertically center the icon with the text
		margin-top: 2px;
		// Reset <button> default browser styles
		border: 0;
		background: none;
		// Override .cdx-button styles
		min-width: @spacing-subsection-toggle;
		min-height: @spacing-subsection-toggle;
		padding: 0;
	}

	.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 {
		// 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 {
		display: block;
		position: relative;
		list-style-type: none;
		padding-left: 8px;
		margin: 0;

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

		a {
			font-size: inherit;
		}
	}
}

// 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 .mw-page-container-inner {
	> .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-tablet ) {
	&.client-js .vector-page-titlebar .vector-toc-landmark {
		display: block;
	}

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