/**
 * Vector modern layout styles for screen
 *
 * Layout rules divide the page into sections and how VectorComponents should be arranged in the skin.
 * The rules here should only define the layout, not color or typography.
 */

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

@selector-workspace-container-sidebar-open: ~'#mw-sidebar-checkbox:checked ~ .mw-workspace-container';
@selector-workspace-container-sidebar-closed: ~'#mw-sidebar-checkbox:not( :checked ) ~ .mw-workspace-container';
@selector-sidebar-container-sidebar-closed: ~'#mw-sidebar-checkbox:not( :checked ) ~ .vector-sidebar-container';
@selector-sidebar-no-toc-sidebar-closed: ~'#mw-sidebar-checkbox:not( :checked ) ~ .vector-sidebar-container-no-toc';

// Sidebar
@width-grid-column-one: 11em;

// Adjust the left position of the sidebar to align it with the sidebar menu button,
// in the header, while ensuring the background gradient still extends to the edge of the screen.
// note: the 1px comes from the transparent border of the sidebar button.
@padding-left-sidebar:
	@margin-horizontal-sidebar-button-icon +
	unit( @border-width-base / @font-size-browser, em );

// Layout containers

// Page container

@min-width-page-container--padded: @max-width-page-container + ( 2 * @padding-horizontal-page-container ); // 106.875em

// Content container

@max-width-workspace-container: unit( 1514px / @font-size-browser, em ); // 99.75em @ 16

// Note this uses variables defined in mediawiki.skin.variables so that VisualEditor can read them
// see T259331.
@padding-content: @padding-top-content @padding-horizontal-content 1.5em;
// We want ~60px of space between the end of the sidebar and the start of the
// content container for aesthetic reasons. The sidebar is already displaced
// -30px so we simply add 30px of space to the width of the sidebar.
@margin-start-content: @width-grid-column-one + unit( 8px / @font-size-browser, em ); // 11.5em @ 16

// Tabs

@height-tabs: 2.5em; // Keep in sync with .vector-menu-tabs height.

// Breakpoints

// This determines the maximum width breakpoint at which
// the content will have a fixed start margin applied to it when the sidebar
// is open. The content can shift its position when the sidebar is open/closed
// at or below this breakpoint and will maintain its position above this breakpoint.
@max-width-margin-start-content:
	(2 * @margin-start-content ) +
	( 2 * @padding-horizontal-page-container ) +
	@max-width-content-container;
// 23em + 3.75em + 60em = 86.75em @ 16

// Defines the minimum viewport width, at which point the layout will not get any
// smaller and will start horizontal scrolling instead.
@min-width-supported:
	unit( 500px / @font-size-browser, em ) -
	( 2 * @padding-horizontal-page-container-wide );
// 31.25em - 3.75em = 27.5em @ 16
@background-color-secondary--modern: #f8f9fa;
@border-color-sidebar: #f8f9fa;
@background-color-page-container: @background-color-base;

body {
	background-color: @background-color-secondary--modern;
	color: @color-base;
	// Vertical scrollbar always visible.
	overflow-y: scroll;
}

.mw-body,
.parsoid-body {
	direction: ltr;

	.vector-layout-legacy & {
		padding: @padding-content;
	}
}

.mw-body {
	border-top: @border-width-base @border-style-base transparent;
	/* Merge the border with tabs' one (in their background image) */
	margin-top: -@border-width-base;
	padding: @padding-content;

	.firstHeading {
		/* Change the default from mediawiki.skinning CSS to let indicators float into heading area */
		overflow: visible;
		margin-bottom: 0;
	}
}

.mw-body-subheader {
	// avoid margin collapsing by setting a border-bottom and margin-top as this will sometimes
	// be empty if no indicators.
	// The total of margin-top and height should be 16px. Since we're using relative units 1em=14px
	// We need to set both height and margin so that the margin is not ignored.
	margin-top: 1em;
	border-bottom: 2px @border-style-base transparent;
}

.mw-header {
	// allow z-index to apply so search results overlay article
	position: relative;
	z-index: @z-index-header;
}

/* Main column */
.mw-body,
#mw-data-after-content,
#left-navigation,
.mw-footer {
	margin-left: 0;
}

/* Content */
.mw-indicators {
	z-index: @z-index-indicators;
}

.mw-body-header {
	.mixin-clearfix();
}

.mw-body .mw-portlet-lang {
	float: right;
}

.vector-body {
	position: relative;
	z-index: @z-index-base;
}

/* Navigation Containers */
.vector-layout-legacy .mw-article-toolbar-container {
	// Clear the floats on #left-navigation and #right-navigation.
	.mixin-clearfix();
	// We want to keep the max-width of the article-toolbar-container the
	// same max-width as the article page's content container in order to
	// prevent it from moving when going from an article page to a
	// history/special page.
	max-width: @max-width-content-container;
	margin-left: auto;
	margin-right: auto;

	.skin-vector-disable-max-width & {
		max-width: none;
	}
}

#left-navigation {
	float: left;
}

#right-navigation {
	float: right;

	// Any dropdowns inside the right navigation in modern Vector (e.g. "more" menu).
	// should be right-aligned to prevent horizontal scrolling.
	.vector-menu-content {
		left: auto;
		right: -@border-width-base;
	}
}

.vector-layout-legacy #mw-panel {
	position: absolute;
	top: 0;
	// Sidebar is displaced from the workspace container so that the
	// sidebar is flush with the edge of the screen at small widths.
	left: -@padding-horizontal-page-container;
	z-index: @z-index-sidebar;

	@media ( min-width: @min-width-desktop-wide ) {
		left: -@padding-horizontal-page-container-wide;
	}
}

// Update positioning when TOC is enabled
.vector-toc-enabled .vector-layout-legacy #mw-panel {
	position: static;
	float: none;
}

// Add float at higher resolutions
@media ( min-width: @min-width-desktop ) {
	.vector-toc-enabled .vector-layout-legacy #mw-panel {
		float: left;
	}
}

.mw-table-of-contents-container {
	// stylelint-disable-next-line plugin/no-unsupported-browser-features
	position: sticky;
	top: 0;
	// Needed for Grid-based layout
	align-self: start;

	.vector-layout-legacy & {
		float: left;
		clear: both;
		// To ensure the TOC is 1.5em (24px) from the top of the viewport when sticky
		// we account for the TOC's top margin
		top: ~'calc( 1.5em - @{margin-top-sidebar-toc_title_inline} )'; // top: -2em
	}
	.vector-layout-legacy @{selector-workspace-container-sidebar-open} & {
		// When main menu is open the TOC's top margin is reduced
		top: ~'calc( 1.5em - @{margin-top-sidebar-toc} )'; // top: 0
	}
}

.parsoid-body {
	padding: @padding-content;
}

#p-namespaces {
	background-image: none;
	padding-left: 0;
}

.mw-footer {
	border-top: @border-base;
	padding: 0.75em;
}

// Container logic.
.mw-page-container {
	// Setting position and z-index is important as it allows overlays appended to the body tag
	// to position themselves over the Vector interface. This forms another stacking context for
	// elements placed inside this element
	position: relative;
	z-index: 0;
	max-width: @max-width-page-container;
	// Fill the viewport even if the content height is small. This also helps
	// mitigate a long sidebar overflowing the page container (T257518).
	min-height: 100%;
	margin-left: auto;
	margin-right: auto;
	// Use non-zero padding to disable margin collapse.
	// Be careful not to use overflow-y: scroll here (see T270146 and T271868)
	padding: 0.05px ( @padding-horizontal-page-container / 2 );
	background-color: @background-color-page-container;
	// Set a min-width to make explicit we do not support anything below this threshold.
	// For devices too small, they should be more useable with horizontal scrolling.
	// e.g. Portrait on an iPad
	min-width: @min-width-supported;

	@media ( min-width: @min-width-desktop ) {
		padding-left: @padding-horizontal-page-container;
		padding-right: @padding-horizontal-page-container;
	}

	@media ( min-width: @min-width-desktop-wide ) {
		padding-left: @padding-horizontal-page-container-wide;
		padding-right: @padding-horizontal-page-container-wide;
	}
}

.skin--responsive .mw-page-container {
	min-width: auto;
}

// Used as a container for absolutely positioned elements.
.mw-page-container-inner {
	position: relative;
}

.mw-workspace-container {
	// The sidebar is absolutely positioned relative to the
	// mw-workspace-container.
	position: relative;

	.vector-layout-legacy & {
		max-width: @max-width-workspace-container;
		margin-left: auto;
		margin-right: auto;
	}

	&.mw-footer-container {
		// T264679: There are elements (e.g. discussion tool popovers) in the main
		// content container that we want to appear on top of the footer. We set the
		// footer container to have static positioning instead of relative
		// positioning (applied by .mw-workspace-container) to enable this.
		position: static;
	}
}

.mw-content-container {
	.vector-layout-legacy & {
		max-width: @max-width-content-container;
		display: flow-root;
		margin-left: auto;
		margin-right: auto;
	}

	// For container logic specific to special pages and history pages.
	.skin-vector-disable-max-width & {
		// Allow the max-width of content on history/special pages to be wider than
		// the max-width of content on article pages.
		// Note, we don't disable the max-width on .mw-article-toolbar-container intentionally
		// to support easier navigation between tabs.
		// See T293441 for further information on that.
		max-width: none;
	}
}

.vector-layout-legacy .mw-footer-container {
	padding-top: 50px;
	padding-bottom: 82px;
}

// FIXME: Delete when .vector-toc-enabled is removed (T310527)
// We want it to appear like the sidebar is going into/coming out of
// `.mw-page-container`, but we can't use `overflow: hidden` on
// `.mw-page-container` because that will cut off the sidebar. Therefore, we
// calculate the maximum distance from the start of `mw-page-container` to the
// start of the sidebar.
@{selector-workspace-container-sidebar-closed} .mw-sidebar {
	transform: translateX( -( @max-width-page-container - @max-width-workspace-container ) / 2 );
}

// Hide sidebar entirely when the checkbox is disabled and the TOC is enabled
.vector-toc-enabled @{selector-workspace-container-sidebar-closed} .mw-sidebar {
	display: none;
}

// Responsive overrides.
@media ( min-width: @min-width-page-container--padded ) {
	.mw-page-container {
		border-left: @border-width-base @border-style-base @border-color-sidebar;
		border-right: @border-width-base @border-style-base @border-color-sidebar;
	}
}

// Adjusts the content when sidebar is open regardless of the viewport width.
.vector-layout-legacy @{selector-workspace-container-sidebar-open} .mw-content-container {
	// For container logic specific to special pages and history pages.
	.skin-vector-disable-max-width & {
		margin-left: @margin-start-content;
	}
}

@media ( max-width: @max-width-margin-start-content ) {
	// Adjusts the content and mw-article-toolbar-container.
	.vector-layout-legacy @{selector-workspace-container-sidebar-open} .mw-content-container {
		margin-left: @margin-start-content;
	}

	// Increase margin when TOC is enabled
	.vector-toc-enabled .vector-layout-legacy @{selector-workspace-container-sidebar-open} .mw-content-container {
		margin-left: @margin-toc-start-content;
	}

	// Specificity needed to disable the default animations at lower resolutions.
	.vector-animations-ready .mw-sidebar {
		// Remove sidebar transition at smaller widths.
		transition: none;
	}
}

.skin-vector-toc-experiment-control .mw-table-of-contents-container,
.skin-vector-toc-experiment-unsampled .mw-table-of-contents-container {
	display: none;
}

// Cannot use display: none on legacy TOC because it needs to be accessible
// to scrollObserver for the TOC A/B test (T303297)
// Instead we hide the contents of the legacy TOC and reset it's styles
// See I3f247730fa1c399e6d2e4d866677703fc24e8c58
.skin-vector-toc-experiment-treatment #toc {
	padding: 0;
	border: 0;
}

.skin-vector-toc-experiment-treatment #toc > * {
	display: none;
}

// Update article page's content container when
// TOC is visible and when TOC is enabled and the sidebar is open.
//
// T306366: When the TOC AB test is enabled, both the old and new TOC are in the
// HTML but only one is actually visible. Prevent the left margin from undesirably
// applying if bucketed into the control or unsampled groups which won't show
// the new TOC.
.skin-vector-disable-max-width .vector-toc-enabled .vector-layout-legacy @{selector-workspace-container-sidebar-open} .mw-content-container,
body:not( .skin-vector-toc-experiment-control ):not( .skin-vector-toc-experiment-unsampled )  .vector-layout-legacy .vector-toc-visible .mw-workspace-container .mw-content-container,
.vector-toc-enabled .vector-layout-legacy @{selector-workspace-container-sidebar-open} .mw-content-container {
	@media ( min-width: @min-width-desktop ) {
		margin-left: @margin-toc-start-content;
	}

	@media ( min-width: @min-width-desktop-wide ) {
		margin-left: @margin-toc-start-content-wide;
	}
}

/**
 * Makes the sidebar full screen at lower resolutions.
 */
@media ( max-width: @max-width-tablet ) {
	@{selector-workspace-container-sidebar-open} {
		#mw-panel {
			width: 100%;
		}

		// !important as we always want to disable the margin-left on these elements
		// Using !important is cleaner than having to rely on specificity involved :checked elements
		.mw-content-container {
			// stylelint-disable-next-line declaration-no-important
			margin-left: 0 !important;
		}
	}
}

@import 'grid.less';