@import 'mediawiki.skin.variables.less';
@import 'mediawiki.mixins';

@baseFontSize: 1em;
@thumbWidth: 80px;
@cardBorder: 1px solid rgba( 0, 0, 0, 0.2 );

.ext-related-articles-card-list {
	.flex-display();
	flex-flow: row wrap;
	font-size: @baseFontSize;
	list-style: none;
	overflow: hidden;
	position: relative;
	padding-left: 0;

	h3 {
		@fontSize: 1em;
		@lineHeight: 1.3;
		@lineHeightEm: @lineHeight * @fontSize;
		font-family: inherit;
		font-size: @fontSize;
		// max 2 lines
		max-height: 2 * @lineHeightEm;
		line-height: @lineHeight;
		margin: 0;
		overflow: hidden;
		padding: 0;
		position: relative;
		font-weight: 500;

		a {
			color: @color-emphasized;
		}

		&::after {
			content: ' ';
			position: absolute;
			right: 0;
			bottom: 0;
			width: 25%;
			height: @lineHeightEm;
			background-color: transparent;
			background-image: linear-gradient( to right, rgba( 255, 255, 255, 0 ), rgba( 255, 255, 255, 1 ) 50% );
		}
	}

	// flex-item
	.ext-related-articles-card {
		background-color: @background-color-base;
		box-sizing: border-box;
		margin: 0;
		height: @thumbWidth;
		position: relative;
		width: 100%;
		border: @cardBorder;

		& + .ext-related-articles-card {
			border-top: 0;
		}

		// Apply radius to top & bottom cards when stacked
		&:first-child {
			border-radius: @border-radius-base @border-radius-base 0 0;
		}

		&:last-child {
			border-radius: 0 0 @border-radius-base @border-radius-base;
		}
	}

	.ext-related-articles-card > a {
		position: absolute;
		top: 0;
		right: 0;
		bottom: 0;
		left: 0;
		z-index: 1;

		&:hover {
			box-shadow: 0 1px 1px rgba( 0, 0, 0, 0.1 );
		}
	}

	.ext-related-articles-card-detail {
		// Vertically center the element using the technique described at
		// http://zerosixthree.se/vertical-align-anything-with-just-3-lines-of-css/.
		//
		// This technique is ideal because:
		// * it's easy to reason about,
		// * `position: relative` means that the element is laid out as if it weren't
		//   positioned, allowing for `text-overflow: ellipsis` to work (see below)
		// * it supports more browsers than flexbox does, and
		// * we don't deliver RelatedArticles assets to those browsers that don't
		//   support CSS 2D transforms
		position: relative;
		top: 50%;
		transform: translateY( -50% );
	}

	.ext-related-articles-card-extract {
		color: @color-subtle;
		font-size: 0.8em;
		white-space: nowrap;
		overflow: hidden;
		text-overflow: ellipsis;
		margin-top: 2px;
	}

	.ext-related-articles-card-thumb {
		background-color: #eaecf0;
		background-repeat: no-repeat;
		background-position: center center;
		background-size: cover;
		float: left;
		height: 100%;
		width: @thumbWidth;
		margin-right: 10px;
	}

	.ext-related-articles-card-thumb-placeholder {
		background-image: url( article.svg );
		background-size: 40px 40px;
	}
}

@media all and ( min-width: @min-width-breakpoint-tablet ) {
	.ext-related-articles-card-list {
		border-top: 0;

		.ext-related-articles-card {
			border: @cardBorder;
			@rightMargin: 1%;
			margin-right: @rightMargin;
			margin-bottom: 10px;
			// max space is 100-2/3
			width: ( 100 - ( 2 * @rightMargin ) ) / 3;

			// Individual border-radius when cards side by side (not stacked)
			&,
			&:first-child,
			&:last-child {
				border-radius: @border-radius-base;
			}

			&:last-child {
				margin-right: 0;
			}

			& + .ext-related-articles-card {
				border: @cardBorder;
			}

			// every 3rd child drop the right margin
			&:nth-child( 3n+3 ) {
				margin-right: 0;
			}
		}
	}
}