/**
 * 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';

// Header

// Header sizes defined in the description of T246170 and comment T246170#5957100
@width-grid-column-one: 11em;
@padding-vertical-header: 0.125em;
@margin-top-header: 0.625em;
@margin-bottom-header: 0.3125em;
@height-header:
	@height-logo-icon +
	@margin-top-header +
	@margin-bottom-header +
	2 * @padding-vertical-header;
// 3.125em + 0.625em + 0.3125em + 0.25em = 4.3125em

// Menu button
@margin-horizontal-sidebar-button-icon: unit( 12px / @font-size-browser, em); // 0.75em @ 16

// Logo

// Logo sizes per specification in T245190.
@height-logo-icon: 3.125em;

// The logo is variable width but typically consists of:
// - a icon (50x50)
// - a wordmark (approx 120px)
@min-width-logo: unit( 180px / @font-size-browser, em ); // 11.25em @ 16

// Search

// Canonical version of spec: T270202
// This assumes the presence of variables inside screen.less. DO NOT import it separately.
// Assumes various variables defined there.
@min-width-search: unit( 150px / @font-size-browser / @font-size-base, em ); // 10.71428571em @ 16 & 0.875em
@min-width-search-tablet: unit( 350px / @font-size-browser / @font-size-base, em ); // 25em @ 16 & 0.875em
@max-width-search: unit( 500px / @font-size-browser / @font-size-base, em ); // 35.71428571em @ 16 & 0.875em
@margin-horizontal-search: unit( 40px / @font-size-browser / @font-size-base, em ); // 2.85714286em @ 16 & 0.875em

// Personal menu

@min-width-personal-tools: unit( 300px / @font-size-browser, em ); // 18.75 @ 16

// Sidebar

@margin-top-sidebar: 0.5em;

// 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

@max-width-page-container: unit( 1650px / @font-size-browser, em ); // 103.125em @ 16
@min-width-page-container--padded: @max-width-page-container + ( 2 * @padding-horizontal-page-container ); // 106.875em
@padding-horizontal-page-container: unit( 30px / @font-size-browser, em ); // 1.875em @ 16

// Content containers

@max-width-workspace-container: unit( 1440px / @font-size-browser, em ); // 90em @ 16
@max-width-content-container: unit( 960px / @font-size-browser, em ); // 60em @ 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 );
// 31.25em - 3.75em = 27.5em @ 16

// Width used to determine when to break the personal tools onto a separate line
// below the search box.
@width-comfortable:
	( 2 * @padding-horizontal-page-container ) +
	@size-sidebar-button +
	@margin-horizontal-sidebar-button-icon +
	@min-width-logo +
	( 2 * @margin-horizontal-search ) +
	@max-width-search +
	@min-width-personal-tools;
// 3.75em + 2.75em + 0.75em + 11.25em + 5.71428571em + 35.71428571em + 18.75em = 78.67857142em @ 16

@border-color-sidebar: @background-color-secondary--modern;
@background-color-secondary--modern: #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;
	padding: @padding-content;
}

.mw-body {
	border-top: @border-width-base @border-style-base @border-color-content;
	/* 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;
	}
}

.mw-header {
	// A min-height is set to account for projects where no icon is set.
	min-height: @height-logo-icon;
	margin: @margin-top-header 0 @margin-bottom-header;
	padding: @padding-vertical-header 0;
	// Vertical centering of header elements (IE>=11), requires flex.
	// Non-flex fallback for IE<=9: float rule on the child elements.
	.flex-display();
	flex-wrap: wrap;
	// https://caniuse.com/#search=align-items
	align-items: center;
	// allow z-index to apply so search results overlay article
	position: relative;
	z-index: @z-index-header;
}

/* Searchbox */
#p-search {
	float: left;
	margin: 0 0 0 @margin-horizontal-search;
	flex-grow: 1;
	z-index: @z-index-menu;
	flex-basis: @min-width-search;

	// #searchform is only a direct child of #p-search before wvui-loads. After
	// wvui loads, `.wvui-typeahead-search` becomes the direct child and is the
	// element where these styles should apply.
	> #searchform,
	.wvui-typeahead-search {
		// Border-box sizing is used for a smooth transition from legacy to Vue
		// search. The width of the container should stay the same before/after the
		// transition.
		.box-sizing( border-box );
		margin-left: 0;
		max-width: @max-width-search;
	}
}

/* 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();

	// TODO: Can be changed to `.mw-portlet-lang` when langauge-in-header feature is default.
	#p-lang-btn {
		// should be vertically aligned with heading.
		margin-top: ( ( @font-size-heading-1 * @line-height-heading ) - @height-lang-button ) / 2;
	}
}

// TODO: Can be changed to `.mw-body .mw-portlet-lang` when langauge-in-header feature is default.
.mw-body #p-lang-btn {
	float: right;
}

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

/* Hide, but keep accessible for screen-readers */
#mw-navigation h2 {
	position: absolute;
	top: -9999px;
}

/* Navigation Containers */
.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;
}

#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;
	}
}

#p-personal {
	flex-grow: 1;
	flex-basis: @min-width-personal-tools;
	margin-left: @margin-horizontal-search;
	// Support IE9: This is reset in @support query below if Flexbox is available.
	float: right;
}

#mw-sidebar-button {
	float: left; // Browser: IE9 support - button as flex-child fallback.
	margin-left: -@margin-horizontal-sidebar-button-icon;
	margin-right: @margin-horizontal-sidebar-button-icon; // Accidentally the same.
}

#mw-panel {
	background-image: linear-gradient( to bottom, @background-color-base 0%, @background-color-secondary--modern 10%, @background-color-secondary--modern 90%, @background-color-base 100% );
	position: absolute;
	// 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;
	width: @width-grid-column-one;
	.box-sizing( border-box );
	// To avoid the white part of the gradient colliding with the sidebar links
	// we apply top and bottom padding.
	padding: 8px 0 40px @padding-left-sidebar;
	z-index: @z-index-sidebar;
}

.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 {
	// 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;
	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;
}

.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 {
	max-width: @max-width-workspace-container;
	margin-left: auto;
	margin-right: auto;
	// The sidebar is absolutely positioned relative to the
	// mw-workspace-container.
	position: relative;

	&.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 {
	max-width: @max-width-content-container;
	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.
		max-width: none;
	}
}

.mw-sidebar-container {
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
}

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

// 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.
#mw-sidebar-checkbox:not( :checked ) ~ .mw-workspace-container .mw-sidebar {
	.transform( translateX( -( @max-width-page-container - @max-width-workspace-container ) / 2 ) );
}

// Responsive overrides.
@media ( min-width: @min-width-page-container--padded ) {
	.mw-page-container {
		border-left: 1px solid @border-color-sidebar;
		border-right: 1px solid @border-color-sidebar;
	}
}

// Adjusts the content when sidebar is open regardless of the viewport width.
.mw-checkbox-hack-checkbox:checked ~ .mw-workspace-container .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 ) {
	#p-search {
		// Support: IE 8, Firefox 18-, Chrome 19-, Safari 5.1-, Opera 19-, Android 4.4.4-.
		width: 13.2em;
		// Support: Modern browsers, responsive width.
		width: 20vw;
		max-width: 100%;
	}

	// Adjusts the content and mw-article-toolbar-container.
	.mw-checkbox-hack-checkbox:checked ~ .mw-workspace-container .mw-content-container,
	.mw-checkbox-hack-checkbox:checked ~ .mw-workspace-container .mw-article-toolbar-container {
		margin-left: @margin-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 );
	}
}

@media ( min-width: ( @max-width-workspace-container + ( 2 * @padding-horizontal-page-container ) ) ) {
	#mw-panel {
		background: @background-color-page-container;
		border-right: 1px solid @border-color-sidebar;
	}
}

// At low resolutions the search must be pushed to the right of the screen
// We use @width-comfortable to determine this threshold as we know it's not possible for
// personal tools to be on the same line at this resolution.
@media ( max-width: @width-comfortable ) {
	// #searchform is only a direct child of #p-search before wvui-loads. After
	// wvui loads, `.wvui-typeahead-search` becomes the direct child and is the
	// element where these styles should apply.
	#p-search > #searchform,
	#p-search .wvui-typeahead-search {
		margin-left: auto;
	}
}

@media ( min-width: @width-breakpoint-tablet ) {
	#p-search {
		min-width: @min-width-search-tablet;
	}

	.mw-page-container {
		padding-left: @padding-horizontal-page-container;
		padding-right: @padding-horizontal-page-container;
	}
}

/**
 * Makes the sidebar full screen at lower resolutions.
 */
@media ( max-width: @width-breakpoint-tablet ) {
	.mw-checkbox-hack-checkbox:checked ~ .mw-workspace-container {
		#mw-panel {
			width: 100%;
			position: relative;
			left: 0;
		}

		// !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,
		.mw-article-toolbar-container {
			// stylelint-disable-next-line declaration-no-important
			margin-left: 0 !important;
		}
	}
}