_card.less

//
// Base styles
//

.card {
	position: relative;
	display: flex;
	flex-direction: column;
	min-width: 0; // See https://github.com/twbs/bootstrap/pull/22740#issuecomment-305868106
	// LESS PORT: Less doesn’t strip “empty” property values so we have to check for a value first.
	& when not (@card-height = ~"") { height: @card-height; }
	word-wrap: break-word;
	background-color: @card-bg;
	background-clip: border-box;
	border: @card-border-width solid @card-border-color;
	#border-radius(@card-border-radius);

	> hr {
		margin-right: 0;
		margin-left: 0;
	}

	> .list-group {
		border-top: inherit;
		border-bottom: inherit;

		&:first-child {
			border-top-width: 0;
			#border-top-radius(@card-inner-border-radius);
		}

		&:last-child  {
			border-bottom-width: 0;
			#border-bottom-radius(@card-inner-border-radius);
		}
	}

	// Due to specificity of the above selector (`.card > .list-group`), we must
	// use a child selector here to prevent double borders.
	> .card-header + .list-group,
	> .list-group + .card-footer {
		border-top: 0;
	}
}

.card-body {
	// Enable `flex-grow: 1` for decks and groups so that card blocks take up
	// as much space as possible, ensuring footers are aligned to the bottom.
	flex: 1 1 auto;
	// Workaround for the image size bug in IE
	// See: https://github.com/twbs/bootstrap/pull/28855
	min-height: 1px;
	padding: @card-spacer-x;
	// LESS PORT: Less doesn’t strip “empty” property values so we have to check for a value first.
	& when not (@card-color = ~"") { color: @card-color; }
}

.card-title {
	margin-bottom: @card-spacer-y;
}

.card-subtitle {
	margin-top: (-@card-spacer-y / 2);
	margin-bottom: 0;
}

.card-text:last-child {
	margin-bottom: 0;
}

.card-link {
	#hover({
		text-decoration: none;
	});

	+ .card-link {
		margin-left: @card-spacer-x;
	}
}

//
// Optional textual caps
//

.card-header {
	padding: @card-spacer-y @card-spacer-x;
	margin-bottom: 0; // Removes the default margin-bottom of <hN>
	// LESS PORT: Less doesn’t strip “empty” property values so we have to check for a value first.
	& when not (@card-cap-color = ~"") { color: @card-cap-color; }
	background-color: @card-cap-bg;
	border-bottom: @card-border-width solid @card-border-color;

	&:first-child {
		#border-radius(@card-inner-border-radius @card-inner-border-radius 0 0);
	}
}

.card-footer {
	padding: @card-spacer-y @card-spacer-x;
	& when not (@card-cap-color = ~"") { color: @card-cap-color; }
	background-color: @card-cap-bg;
	border-top: @card-border-width solid @card-border-color;

	&:last-child {
		#border-radius(0 0 @card-inner-border-radius @card-inner-border-radius);
	}
}


//
// Header navs
//

.card-header-tabs {
	margin-right: (-@card-spacer-x / 2);
	margin-bottom: -@card-spacer-y;
	margin-left: (-@card-spacer-x / 2);
	border-bottom: 0;
}

.card-header-pills {
	margin-right: (-@card-spacer-x / 2);
	margin-left: (-@card-spacer-x / 2);
}

// Card image
.card-img-overlay {
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
	padding: @card-img-overlay-padding;
	#border-radius(@card-inner-border-radius);
}

.card-img,
.card-img-top,
.card-img-bottom {
	flex-shrink: 0; // For IE: https://github.com/twbs/bootstrap/issues/29396
	width: 100%; // Required because we use flexbox and this inherently applies align-self: stretch
}

.card-img,
.card-img-top {
	#border-top-radius(@card-inner-border-radius);
}

.card-img,
.card-img-bottom {
	#border-bottom-radius(@card-inner-border-radius);
}


// Card deck

.card-deck {
	.card {
		margin-bottom: @card-deck-margin;
	}

	#media-breakpoint-up(sm, {
		display: flex;
		flex-flow: row wrap;
		margin-right: -@card-deck-margin;
		margin-left: -@card-deck-margin;

		.card {
			// Flexbugs #4: https://github.com/philipwalton/flexbugs#flexbug-4
			flex: 1 0 0%;
			margin-right: @card-deck-margin;
			margin-bottom: 0; // Override the default
			margin-left: @card-deck-margin;
		}
	});
}


//
// Card groups
//

.card-group {
	// The child selector allows nested `.card` within `.card-group`
	// to display properly.
	> .card {
		margin-bottom: @card-group-margin;
	}

	#media-breakpoint-up(sm, {
		display: flex;
		flex-flow: row wrap;
		// The child selector allows nested `.card` within `.card-group`
		// to display properly.
		> .card {
			// Flexbugs #4: https://github.com/philipwalton/flexbugs#flexbug-4
			flex: 1 0 0%;
			margin-bottom: 0;

			+ .card {
				margin-left: 0;
				border-left: 0;
			}

			// Handle rounded corners
			& when (@enable-rounded) {
				&:not(:last-child) {
					#border-right-radius(0);

					.card-img-top,
					.card-header {
						border-top-right-radius: 0;
					}
					.card-img-bottom,
					.card-footer {
						border-bottom-right-radius: 0;
					}
				}

				&:not(:first-child) {
					#border-left-radius(0);

					.card-img-top,
					.card-header {
						border-top-left-radius: 0;
					}
					.card-img-bottom,
					.card-footer {
						border-bottom-left-radius: 0;
					}
				}
			}
		}
	});
}


//
// Columns
//

.card-columns {
	.card {
		margin-bottom: @card-columns-margin;
	}

	#media-breakpoint-up(sm, {
		column-count: @card-columns-count;
		column-gap: @card-columns-gap;
		orphans: 1;
		widows: 1;

		.card {
			display: inline-block; // Don't let them vertically span multiple columns
			width: 100%; // Don't let their width change
		}
	});
}


//
// Accordion
//

.accordion {
	overflow-anchor: none;

	> .card {
		overflow: hidden;

		&:not(:last-of-type) {
			border-bottom: 0;
			#border-bottom-radius(0);
		}

		&:not(:first-of-type) {
			#border-top-radius(0);
		}

		> .card-header {
			#border-radius(0);
			margin-bottom: -@card-border-width;
		}
	}
}