// Make the div behave like a button
.btn-group,
.btn-group-vertical {
	position: relative;
	display: inline-flex;
	vertical-align: middle; // match .btn alignment given font-size hack above

	> .btn {
		position: relative;
		flex: 0 1 auto;

		// Bring the hover, focused, and "active" buttons to the front to overlay
		// the borders properly
		#hover({
			z-index: 1;
		});
		&:focus,
		&:active,
		&.active {
			z-index: 1;
		}
	}

	// Prevent double borders when buttons are next to each other
	.btn + .btn,
	.btn + .btn-group,
	.btn-group + .btn,
	.btn-group + .btn-group {
		margin-left: -@btn-border-width;
	}
}

// Optional: Group multiple button groups together for a toolbar
.btn-toolbar {
	display: flex;
	flex-wrap: wrap;
	justify-content: flex-start;

	.input-group {
		width: auto;
	}
}

.btn-group {
	> .btn:first-child {
		margin-left: 0;
	}

	// Reset rounded corners
	> .btn:not(:last-child):not(.dropdown-toggle),
	> .btn-group:not(:last-child) > .btn {
		#border-right-radius(0);
	}

	> .btn:not(:first-child),
	> .btn-group:not(:first-child) > .btn {
		#border-left-radius(0);
	}
}

// Sizing
//
// Remix the default button sizing classes into new ones for easier manipulation.

.btn-group-sm > .btn { &:extend(.btn-sm all); }
.btn-group-lg > .btn { &:extend(.btn-lg all); }


//
// Split button dropdowns
//

.dropdown-toggle-split {
	padding-right: (@btn-padding-x * 0.75);
	padding-left: (@btn-padding-x * 0.75);

	&::after,
	.dropup &::after,
	.dropright &::after {
		margin-left: 0;
	}

	.dropleft &::before {
		margin-right: 0;
	}
}

.btn-sm + .dropdown-toggle-split {
	padding-right: (@btn-padding-x-sm * 0.75);
	padding-left: (@btn-padding-x-sm * 0.75);
}

.btn-lg + .dropdown-toggle-split {
	padding-right: (@btn-padding-x-lg * 0.75);
	padding-left: (@btn-padding-x-lg * 0.75);
}


// The clickable button for toggling the menu
// Set the same inset shadow as the :active state
.btn-group.show .dropdown-toggle {
	#box-shadow(@btn-active-box-shadow);

	// Show no shadow for `.btn-link` since it has no other button styles.
	&.btn-link {
		#box-shadow(none);
	}
}


//
// Vertical button groups
//

.btn-group-vertical {
	flex-direction: column;
	align-items: flex-start;
	justify-content: center;

	.btn,
	.btn-group {
		width: 100%;
	}

	> .btn + .btn,
	> .btn + .btn-group,
	> .btn-group + .btn,
	> .btn-group + .btn-group {
		margin-top: -@btn-border-width;
		margin-left: 0;
	}

	// Reset rounded corners
	> .btn:not(:last-child):not(.dropdown-toggle),
	> .btn-group:not(:last-child) > .btn {
		#border-bottom-radius(0);
	}

	> .btn:not(:first-child),
	> .btn-group:not(:first-child) > .btn {
		#border-top-radius(0);
	}
}


// Checkbox and radio options
//
// In order to support the browser's form validation feedback, powered by the
// `required` attribute, we have to "hide" the inputs via `clip`. We cannot use
// `display: none;` or `visibility: hidden;` as that also hides the popover.
// Simply visually hiding the inputs via `opacity` would leave them clickable in
// certain cases which is prevented by using `clip` and `pointer-events`.
// This way, we ensure a DOM element is visible to position the popover from.
//
// See https://github.com/twbs/bootstrap/pull/12794 and
// https://github.com/twbs/bootstrap/pull/14559 for more information.

.btn-group-toggle {
	> .btn,
	> .btn-group > .btn {
		margin-bottom: 0; // Override default `<label>` value

		input[type="radio"],
		input[type="checkbox"] {
			position: absolute;
			clip: rect(0, 0, 0, 0);
			pointer-events: none;
		}
	}
}