//
// Mixins
// --------------------------------------------------


// Utilities
// -------------------------

// Clearfix
// Source: http://nicolasgallagher.com/micro-clearfix-hack/
//
// For modern browsers
// 1. The space content is one way to avoid an Opera bug when the
//    contenteditable attribute is included anywhere else in the document.
//    Otherwise it causes space to appear at the top and bottom of elements
//    that are clearfixed.
// 2. The use of `table` rather than `block` is only necessary if using
//    `:before` to contain the top-margins of child elements.
.clearfix() {
	&:before,
	&:after {
		content: " "; /* 1 */
		display: table; /* 2 */
	}
	&:after {
		clear: both;
	}
}

// Webkit-style focus
.tab-focus() {
	// Default
	outline: thin dotted #333;
	// Webkit
	outline: 5px auto -webkit-focus-ring-color;
	outline-offset: -2px;
}

// Center-align a block level element
.center-block() {
	display: block;
	margin-left: auto;
	margin-right: auto;
}

// Sizing shortcuts
.size(@width; @height) {
	width: @width;
	height: @height;
}
.square(@size) {
	.size(@size; @size);
}

// Placeholder text
.placeholder(@color: @input-color-placeholder) {
	&:-moz-placeholder            { color: @color; } // Firefox 4-18
	&::-moz-placeholder           { color: @color; } // Firefox 19+
	&:-ms-input-placeholder       { color: @color; } // Internet Explorer 10+
	&::-webkit-input-placeholder  { color: @color; } // Safari and Chrome
}

// Text overflow
// Requires inline-block or block for proper styling
.text-overflow() {
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

// CSS image replacement
// Source: https://github.com/h5bp/html5-boilerplate/commit/aa0396eae757
.hide-text() {
	font: ~"0/0" a;
	color: transparent;
	text-shadow: none;
	background-color: transparent;
	border: 0;
}



// CSS3 PROPERTIES
// --------------------------------------------------

// Rounded
.rounded(@radius) {
	-webkit-border-radius: @radius;
	-moz-border-radius: @radius;
	border-radius: @radius;
}

// Borner radius
.border-radius(@topLeft: 0, @topRight: 0, @bottomRight: 0, @bottomLeft: 0) {
	// Top Left
	-webkit-border-top-left-radius: @topLeft;
	-moz-border-radius-topleft: @topLeft;
	border-top-left-radius: @topLeft;
	// Top Right
	-webkit-border-top-right-radius: @topRight;
	-moz-border-radius-topright: @topRight;
	border-top-right-radius: @topRight;
	// Bottom Right
	-webkit-border-bottom-right-radius: @bottomRight;
	-moz-border-radius-bottomright: @bottomRight;
	border-bottom-right-radius: @bottomRight;
	// Bottom Left
	-webkit-border-bottom-left-radius: @bottomLeft;
	-moz-border-radius-bottomleft: @bottomLeft;
	border-bottom-left-radius: @bottomLeft;
}

// Single side border-radius
.border-top-radius(@radius) {
	border-top-right-radius: @radius;
	border-top-left-radius: @radius;
}
.border-right-radius(@radius) {
	border-bottom-right-radius: @radius;
	border-top-right-radius: @radius;
}
.border-bottom-radius(@radius) {
	border-bottom-right-radius: @radius;
	border-bottom-left-radius: @radius;
}
.border-left-radius(@radius) {

	-webkit-border-bottom-left-radius: @radius;
	-moz-border-radius-bottomleft: @radius;
	border-bottom-left-radius: @radius;
	-webkit-border-top-left-radius: @radius;
	-moz-border-radius-topleft: @radius;
	border-top-left-radius: @radius;
}

// Drop shadows
.box-shadow(@shadow) {
	-webkit-box-shadow: @shadow; // iOS <4.3 & Android <4.1
	box-shadow: @shadow;
}

//Basic Box Shadow
.text-shadow (@color, @blur: 2px, @x: 0, @y: 0px ) {
	text-shadow: @x @y @blur @color;
	filter: Shadow(Color = @color, Direction= tan(@x/@y), Strength=4);
}

.text-shadowed (@x: 0px, @y: 1px, @blur: 2px, @alfa: 0.1 ) {
	text-shadow: @x @y @blur rgba(0, 0, 0, @alfa);
	filter: Shadow(Color = rgba(0, 0, 0, @alfa), Direction= tan(@x/@y), Strength=4);
}

// Transitions
.transition(@transition) {
	-webkit-transition: @transition;
	transition: @transition;
}
.transition-delay(@transition-delay) {
	-webkit-transition-delay: @transition-delay;
	transition-delay: @transition-delay;
}
.transition-duration(@transition-duration) {
	-webkit-transition-duration: @transition-duration;
	transition-duration: @transition-duration;
}
.transition-transform(@transition) {
	-webkit-transition: -webkit-transform @transition;
	-moz-transition: -moz-transform @transition;
	-o-transition: -o-transform @transition;
	transition: transform @transition;
}



// Transformations
.rotate(@degrees) {
	-webkit-transform: rotate(@degrees);
	-ms-transform: rotate(@degrees); // IE9+
	transform: rotate(@degrees);
}
.scale(@ratio) {
	-webkit-transform: scale(@ratio);
	-ms-transform: scale(@ratio); // IE9+
	transform: scale(@ratio);
}
.translate(@x; @y) {
	-webkit-transform: translate(@x, @y);
	-ms-transform: translate(@x, @y); // IE9+
	transform: translate(@x, @y);
}
.skew(@x; @y) {
	-webkit-transform: skew(@x, @y);
	-ms-transform: skewX(@x) skewY(@y); // See https://github.com/twbs/bootstrap/issues/4885; IE9+
	transform: skew(@x, @y);
}
.translate3d(@x; @y; @z) {
	-webkit-transform: translate3d(@x, @y, @z);
	transform: translate3d(@x, @y, @z);
}

// Backface visibility
// Prevent browsers from flickering when using CSS 3D transforms.
// Default value is `visible`, but can be changed to `hidden`
// See git pull https://github.com/dannykeane/bootstrap.git backface-visibility for examples
.backface-visibility(@visibility){
	-webkit-backface-visibility: @visibility;
	-moz-backface-visibility: @visibility;
	backface-visibility: @visibility;
}

// Box sizing
.box-sizing(@boxmodel) {
	-webkit-box-sizing: @boxmodel;
	-moz-box-sizing: @boxmodel;
	box-sizing: @boxmodel;
}

// User select
// For selecting text on the page
.user-select(@select) {
	-webkit-user-select: @select;
	-moz-user-select: @select;
	-ms-user-select: @select; // IE10+
	-o-user-select: @select;
	user-select: @select;
}

// Resize anything
.resizable(@direction) {
	resize: @direction; // Options: horizontal, vertical, both
	overflow: auto; // Safari fix
}

// CSS3 Content Columns
.content-columns(@column-count; @column-gap: @grid-gutter-width) {
	-webkit-column-count: @column-count;
	-moz-column-count: @column-count;
	column-count: @column-count;
	-webkit-column-gap: @column-gap;
	-moz-column-gap: @column-gap;
	column-gap: @column-gap;
}

// Optional hyphenation
.hyphens(@mode: auto) {
	word-wrap: break-word;
	-webkit-hyphens: @mode;
	-moz-hyphens: @mode;
	-ms-hyphens: @mode; // IE10+
	-o-hyphens: @mode;
	hyphens: @mode;
}

// Opacity
.opacity(@opacity) {
	opacity: @opacity;
	// IE8 filter
	@opacity-ie: (@opacity * 100);
	filter: ~"alpha(opacity=@{opacity-ie})";
}



// GRADIENTS
// --------------------------------------------------

#gradient {

	// Horizontal gradient, from left to right
	//
	// Creates two color stops, start and end, by specifying a color and position for each color stop.
	// Color stops are not available in IE9 and below.
	.horizontal(@start-color: #555; @end-color: #333; @start-percent: 0%; @end-percent: 100%) {
		background-image: -webkit-gradient(linear, @start-percent top, @end-percent top, from(@start-color), to(@end-color)); // Safari 4+, Chrome 2+
		background-image: -webkit-linear-gradient(left, color-stop(@start-color @start-percent), color-stop(@end-color @end-percent)); // Safari 5.1+, Chrome 10+
		background-image: -moz-linear-gradient(left, @start-color @start-percent, @end-color @end-percent); // FF 3.6+
		background-image:  linear-gradient(to right, @start-color @start-percent, @end-color @end-percent); // Standard, IE10
		background-repeat: repeat-x;
		filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@start-color),argb(@end-color))); // IE9 and down
	}

	// Vertical gradient, from top to bottom
	//
	// Creates two color stops, start and end, by specifying a color and position for each color stop.
	// Color stops are not available in IE9 and below.
	.vertical(@start-color: #555; @end-color: #333; @start-percent: 0%; @end-percent: 100%) {
		background-image: -webkit-gradient(linear, left @start-percent, left @end-percent, from(@start-color), to(@end-color)); // Safari 4+, Chrome 2+
		background-image: -webkit-linear-gradient(top, @start-color, @start-percent, @end-color, @end-percent); // Safari 5.1+, Chrome 10+
		background-image:  -moz-linear-gradient(top, @start-color @start-percent, @end-color @end-percent); // FF 3.6+
		background-image: linear-gradient(to bottom, @start-color @start-percent, @end-color @end-percent); // Standard, IE10
		background-repeat: repeat-x;
		filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@start-color),argb(@end-color))); // IE9 and down
	}

	.directional(@start-color: #555; @end-color: #333; @deg: 45deg) {
		background-repeat: repeat-x;
		background-image: -webkit-linear-gradient(@deg, @start-color, @end-color); // Safari 5.1+, Chrome 10+
		background-image: -moz-linear-gradient(@deg, @start-color, @end-color); // FF 3.6+
		background-image: linear-gradient(@deg, @start-color, @end-color); // Standard, IE10
	}
	.horizontal-three-colors(@start-color: #00b3ee; @mid-color: #7a43b6; @color-stop: 50%; @end-color: #c3325f) {
		background-image: -webkit-gradient(left, linear, 0 0, 0 100%, from(@start-color), color-stop(@color-stop, @mid-color), to(@end-color));
		background-image: -webkit-linear-gradient(left, @start-color, @mid-color @color-stop, @end-color);
		background-image: -moz-linear-gradient(left, @start-color, @mid-color @color-stop, @end-color);
		background-image: linear-gradient(to right, @start-color, @mid-color @color-stop, @end-color);
		background-repeat: no-repeat;
		filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@start-color),argb(@end-color))); // IE9 and down, gets no color-stop at all for proper fallback
	}
	.vertical-three-colors(@start-color: #00b3ee; @mid-color: #7a43b6; @color-stop: 50%; @end-color: #c3325f) {
		background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@start-color), color-stop(@color-stop, @mid-color), to(@end-color));
		background-image: -webkit-linear-gradient(@start-color, @mid-color @color-stop, @end-color);
		background-image: -moz-linear-gradient(top, @start-color, @mid-color @color-stop, @end-color);
		background-image: linear-gradient(@start-color, @mid-color @color-stop, @end-color);
		background-repeat: no-repeat;
		filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@start-color),argb(@end-color))); // IE9 and down, gets no color-stop at all for proper fallback
	}
	.radial(@inner-color: #555; @outer-color: #333) {
		background-image: -webkit-gradient(radial, center center, 0, center center, 460, from(@inner-color), to(@outer-color));
		background-image: -webkit-radial-gradient(circle, @inner-color, @outer-color);
		background-image: -moz-radial-gradient(circle, @inner-color, @outer-color);
		background-image: radial-gradient(circle, @inner-color, @outer-color);
		background-repeat: no-repeat;
	}
	.striped(@color: #555; @angle: 45deg) {
		background-image: -webkit-gradient(linear, 0 100%, 100% 0, color-stop(.25, rgba(255,255,255,.15)), color-stop(.25, transparent), color-stop(.5, transparent), color-stop(.5, rgba(255,255,255,.15)), color-stop(.75, rgba(255,255,255,.15)), color-stop(.75, transparent), to(transparent));
		background-image: -webkit-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
		background-image: -moz-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
		background-image: linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
	}
}

// Reset filters for IE
//
// When you need to remove a gradient background, do not forget to use this to reset
// the IE filter for IE9 and below.
.reset-filter() {
	filter: e(%("progid:DXImageTransform.Microsoft.gradient(enabled = false)"));
}



// Retina images
//
// Short retina mixin for setting background-image and -size

.img-retina(@file-1x; @file-2x; @width-1x; @height-1x) {
	background-image: url("@{file-1x}");

	@media
	only screen and (-webkit-min-device-pixel-ratio: 2),
	only screen and (   min--moz-device-pixel-ratio: 2),
	only screen and (     -o-min-device-pixel-ratio: 2/1),
	only screen and (        min-device-pixel-ratio: 2),
	only screen and (                min-resolution: 192dpi),
	only screen and (                min-resolution: 2dppx) {
		background-image: url("@{file-2x}");
		background-size: @width-1x @height-1x;
	}
}


// Responsive image
//
// Keep images from scaling beyond the width of their parents.

.img-responsive(@display: block;) {
	display: @display;
	max-width: 100%; // Part 1: Set a maximum relative to the parent
	height: auto; // Part 2: Scale the height according to the width, otherwise you get stretching
}


// COMPONENT MIXINS
// --------------------------------------------------

// Horizontal dividers
// -------------------------
// Dividers (basically an hr) within dropdowns and nav lists
.nav-divider(@color: #e5e5e5) {
	height: 1px;
	margin: ((@line-height-computed / 2) - 1) 0;
	overflow: hidden;
	background-color: @color;
}

// Panels
// -------------------------
.panel-variant(@border; @heading-text-color; @heading-bg-color; @heading-border;) {
	border-color: @border;
	& > .panel-heading {
		color: @heading-text-color;
		background-color: @heading-bg-color;
		border-color: @heading-border;
		+ .panel-collapse .panel-body {
			border-top-color: @border;
		}
	}
	& > .panel-footer {
		+ .panel-collapse .panel-body {
			border-bottom-color: @border;
		}
	}
}

// Alerts
// -------------------------
.alert-variant(@background; @border; @text-color) {
	background-color: @background;
	border-color: @border;
	color: @text-color;
	hr {
		border-top-color: darken(@border, 5%);
	}
	.alert-link {
		// color: darken(@text-color, 10%);
	}
}

// Tables
// -------------------------
.table-row-variant(@state; @background; @border) {
	// Exact selectors below required to override `.table-striped` and prevent
	// inheritance to nested tables.
	.table > thead > tr,
	.table > tbody > tr,
	.table > tfoot > tr {
		> td.@{state},
		> th.@{state},
		&.@{state} > td,
		&.@{state} > th {
			background-color: @background;
			border-color: @border;
		}
	}

	// Hover states for `.table-hover`
	// Note: this is not available for cells or rows within `thead` or `tfoot`.
	.table-hover > tbody > tr {
		> td.@{state}:hover,
		> th.@{state}:hover,
		&.@{state}:hover > td {
			background-color: darken(@background, 5%);
			border-color: darken(@border, 5%);
		}
	}
}

// Button variants
// -------------------------
// Easily pump out default styles, as well as :hover, :focus, :active,
// and disabled options for all buttons
.button-variant(@color; @background; @border) {
	color: @color;
	background-color: @background;
	border-color: @border;

	&:hover,
	&:focus,
	&:active,
	&.active,
	.open .dropdown-toggle& {
		color: @color;
		background-color: darken(@background, 8%);
		border-color: darken(@border, 12%);
	}
	&:active,
	&.active,
	.open .dropdown-toggle& {
		background-image: none;
	}
	&.disabled,
	&[disabled],
	fieldset[disabled] & {
		&,
		&:hover,
		&:focus,
		&:active,
		&.active {
			background-color: @background;
			border-color: @border
		}
	}
}

// Button sizes
// -------------------------
.button-size(@padding-vertical; @padding-horizontal; @font-size; @line-height; @border-radius) {
	padding: @padding-vertical @padding-horizontal;
	font-size: @font-size;
	line-height: @line-height;
	border-radius: @border-radius;
}

// Pagination
// -------------------------
.pagination-size(@padding-vertical; @padding-horizontal; @font-size; @border-radius) {
	> li {
		> a,
		> span {
			padding: @padding-vertical @padding-horizontal;
			font-size: @font-size;
		}
		&:first-child {
			> a,
			> span {
				.border-left-radius(@border-radius);
			}
		}
		&:last-child {
			> a,
			> span {
				.border-right-radius(@border-radius);
			}
		}
	}
}

// Labels
// -------------------------
.label-variant(@color) {
	background-color: @color;
	&[href] {
		&:hover,
		&:focus {
			background-color: darken(@color, 10%);
		}
	}
}

// Navbar vertical align
// -------------------------
// Vertically center elements in the navbar.
// Example: an element has a height of 30px, so write out `.navbar-vertical-align(30px);` to calculate the appropriate top margin.
.navbar-vertical-align(@element-height) {
	margin-top: ((@navbar-height - @element-height) / 2);
	margin-bottom: ((@navbar-height - @element-height) / 2);
}

// Progress bars
// -------------------------
.progress-bar-variant(@color) {
	background-color: @color;
	.progress-striped & {
		#gradient > .striped(@color);
	}
}

// Responsive utilities
// -------------------------
// More easily include all the states for responsive-utilities.less.
.responsive-visibility() {
	display: block !important;
	tr& { display: table-row !important; }
	th&,
	td& { display: table-cell !important; }
}

.responsive-invisibility() {
	display: none !important;
	tr& { display: none !important; }
	th&,
	td& { display: none !important; }
}

// Grid System
// -----------

// Centered container element
.container-fixed() {
	margin-right: auto;
	margin-left: auto;
	padding-left:  (@grid-gutter-width / 2);
	padding-right: (@grid-gutter-width / 2);
	.clearfix();
}

// Creates a wrapper for a series of columns
.make-row(@gutter: @grid-gutter-width) {
	margin-left:  (@gutter / -2);
	margin-right: (@gutter / -2);
	.clearfix();
}

// Generate the extra small columns
.make-xs-column(@columns; @gutter: @grid-gutter-width) {
	position: relative;
	float: left;
	width: percentage((@columns / @grid-columns));
	// Prevent columns from collapsing when empty
	min-height: 1px;
	// Inner gutter via padding
	padding-left:  (@gutter / 2);
	padding-right: (@gutter / 2);
}

// Generate the small columns
.make-sm-column(@columns; @gutter: @grid-gutter-width) {
	position: relative;
	// Prevent columns from collapsing when empty
	min-height: 1px;
	// Inner gutter via padding
	padding-left:  (@gutter / 2);
	padding-right: (@gutter / 2);

	// Calculate width based on number of columns available
	@media (min-width: @screen-sm) {
		float: left;
		width: percentage((@columns / @grid-columns));
	}
}

// Generate the small column offsets
.make-sm-column-offset(@columns) {
	@media (min-width: @screen-sm) {
		margin-left: percentage((@columns / @grid-columns));
	}
}
.make-sm-column-push(@columns) {
	@media (min-width: @screen-sm) {
		left: percentage((@columns / @grid-columns));
	}
}
.make-sm-column-pull(@columns) {
	@media (min-width: @screen-sm) {
		right: percentage((@columns / @grid-columns));
	}
}

// Generate the medium columns
.make-md-column(@columns; @gutter: @grid-gutter-width) {
	position: relative;
	// Prevent columns from collapsing when empty
	min-height: 1px;
	// Inner gutter via padding
	padding-left:  (@gutter / 2);
	padding-right: (@gutter / 2);

	// Calculate width based on number of columns available
	@media (min-width: @screen-md) {
		float: left;
		width: percentage((@columns / @grid-columns));
	}
}

// Generate the large column offsets
.make-md-column-offset(@columns) {
	@media (min-width: @screen-md) {
		margin-left: percentage((@columns / @grid-columns));
	}
}
.make-md-column-push(@columns) {
	@media (min-width: @screen-md) {
		left: percentage((@columns / @grid-columns));
	}
}
.make-md-column-pull(@columns) {
	@media (min-width: @screen-md) {
		right: percentage((@columns / @grid-columns));
	}
}

// Generate the large columns
.make-lg-column(@columns; @gutter: @grid-gutter-width) {
	position: relative;
	// Prevent columns from collapsing when empty
	min-height: 1px;
	// Inner gutter via padding
	padding-left:  (@gutter / 2);
	padding-right: (@gutter / 2);

	// Calculate width based on number of columns available
	@media (min-width: @screen-lg) {
		float: left;
		width: percentage((@columns / @grid-columns));
	}
}

// Generate the large column offsets
.make-lg-column-offset(@columns) {
	@media (min-width: @screen-lg) {
		margin-left: percentage((@columns / @grid-columns));
	}
}
.make-lg-column-push(@columns) {
	@media (min-width: @screen-lg) {
		left: percentage((@columns / @grid-columns));
	}
}
.make-lg-column-pull(@columns) {
	@media (min-width: @screen-lg) {
		right: percentage((@columns / @grid-columns));
	}
}


// Form validation states
//
// Used in forms.less to generate the form validation CSS for warnings, errors,
// and successes.

.form-control-validation(@text-color: #555; @border-color: #ccc; @background-color: #f5f5f5) {
	// Color the label and help text
	.help-block,
	.control-label {
		color: @text-color;
	}
	// Set the border and box shadow on specific inputs to match
	.form-control {
		border-color: @border-color;
		.box-shadow(inset 0 1px 1px rgba(0,0,0,.075)); // Redeclare so transitions work
		&:focus {
			border-color: darken(@border-color, 10%);
			@shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@border-color, 20%);
			.box-shadow(@shadow);
		}
	}
	// Set validation states also for addons
	.input-group-addon {
		color: @text-color;
		border-color: @border-color;
		background-color: @background-color;
	}
}

// Form control focus state
//
// Generate a customized focus state and for any input with the specified color,
// which defaults to the `@input-focus-border` variable.
//
// We highly encourage you to not customize the default value, but instead use
// this to tweak colors on an as-needed basis. This aesthetic change is based on
// WebKit's default styles, but applicable to a wider range of browsers. Its
// usability and accessibility should be taken into account with any change.
//
// Example usage: change the default blue border and shadow to white for better
// contrast against a dark gray background.

.form-control-focus(@color: @input-border-focus) {
	@color-rgba: rgba(red(@color), green(@color), blue(@color), .6);
	&:focus {
		border-color: @color;
		outline: 0;
		.box-shadow(~"inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px @{color-rgba}");
	}
}

// Form control sizing
//
// Relative text size, padding, and border-radii changes for form controls. For
// horizontal sizing, wrap controls in the predefined grid classes. `<select>`
// element gets special love because it's special, and that's a fact!

.input-size(@input-height; @padding-vertical; @padding-horizontal; @font-size; @line-height; @border-radius) {
	height: @input-height;
	padding: @padding-vertical @padding-horizontal;
	font-size: @font-size;
	line-height: @line-height;
	border-radius: @border-radius;

	select& {
		height: @input-height;
		line-height: @input-height;
	}

	textarea& {
		height: auto;
	}
}