Bootstrap/lib/preboot.less

/* Preboot.less
 * Variables and mixins to pre-ignite any new web development project
 * ------------------------------------------------------------------ */


// VARIABLES
// ---------

// Links
@linkColor:         #0069d6;
@linkColorHover:    darken(@linkColor, 10);

// Grays
@black:             #000;
@grayDark:          lighten(@black, 25%);
@gray:              lighten(@black, 50%);
@grayLight:         lighten(@black, 75%);
@grayLighter:       lighten(@black, 90%);
@white:             #fff;

// Accent Colors
@blue:              #049CDB;
@blueDark:          #0064CD;
@green:             #46a546;
@red:               #9d261d;
@yellow:            #ffc40d;
@orange:            #f89406;
@pink:              #c3325f;
@purple:            #7a43b6;

// Baseline grid
@basefont:          13px;
@baseline:          18px;

// Griditude
@gridColumns:       16;
@gridColumnWidth:   40px;
@gridGutterWidth:   20px;
@siteWidth:         (@gridColumns * @gridColumnWidth) + (@gridGutterWidth * (@gridColumns - 1));

// Color Scheme
@baseColor:         @blue;                  // Set a base color
@complement:        spin(@baseColor, 180);  // Determine a complementary color
@split1:            spin(@baseColor, 158);  // Split complements
@split2:            spin(@baseColor, -158);
@triad1:            spin(@baseColor, 135);  // Triads colors
@triad2:            spin(@baseColor, -135);
@tetra1:            spin(@baseColor, 90);   // Tetra colors
@tetra2:            spin(@baseColor, -90);
@analog1:           spin(@baseColor, 22);   // Analogs colors
@analog2:           spin(@baseColor, -22);


// MIXINS
// ------

// Clearfix for clearing floats like a boss h5bp.com/q
.clearfix {
  zoom: 1;
	&:before, &:after {
    display: table;
    content: "";
	}
	&:after {
    clear: both;
	}
}

// Center-align a block level element
.center-block {
	display: block;
  margin: 0 auto;
}

// Sizing shortcuts
.size(@height: 5px, @width: 5px) {
	height: @height;
	width: @width;
}
.square(@size: 5px) {
	.size(@size, @size);
}

// Input placeholder text
.placeholder(@color: @grayLight) {
  :-moz-placeholder {
    color: @color;
  }
  ::-webkit-input-placeholder {
    color: @color;
  }
}

// Font Stacks
#font {
  .shorthand(@weight: normal, @size: 14px, @lineHeight: 20px) {
    font-size: @size;
    font-weight: @weight;
    line-height: @lineHeight;
  }
  .sans-serif(@weight: normal, @size: 14px, @lineHeight: 20px) {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: @size;
    font-weight: @weight;
    line-height: @lineHeight;
  }
  .serif(@weight: normal, @size: 14px, @lineHeight: 20px) {
    font-family: "Georgia", Times New Roman, Times, serif;
    font-size: @size;
    font-weight: @weight;
    line-height: @lineHeight;
  }
  .monospace(@weight: normal, @size: 12px, @lineHeight: 20px) {
    font-family: "Monaco", Courier New, monospace;
    font-size: @size;
    font-weight: @weight;
    line-height: @lineHeight;
  }
}

// Grid System
.container {
  width: @siteWidth;
  margin: 0 auto;
  .clearfix();
}
.columns(@columnSpan: 1) {
  float: left;
  width: (@gridColumnWidth * @columnSpan) + (@gridGutterWidth * (@columnSpan - 1));
  margin-left: @gridGutterWidth;
  &:first-child {
    margin-left: 0;
  }
}
.offsetMath(@extraSpace: 40px) {
  margin-left: (@gridColumnWidth * @columnOffset) + (@gridGutterWidth * (@columnOffset - 1)) + @extraSpace !important;
}
.offset(@columnOffset: 1) {
  .offsetMath(40px);
  &:first-child {
    .offsetMath(20px);
  }
}

// Border Radius
.border-radius(@radius: 5px) {
  -webkit-border-radius: @radius;
  -moz-border-radius: @radius;
  border-radius: @radius;
}

// Drop shadows
.box-shadow(@shadow: 0 1px 3px rgba(0,0,0,.25)) {
  -webkit-box-shadow: @shadow;
  -moz-box-shadow: @shadow;
  box-shadow: @shadow;
}

// Transitions
.transition(@transition) {
	-webkit-transition: @transition;
	-moz-transition: @transition;
	transition: @transition;
}

// Background clipping
.background-clip(@clip) {
	-webkit-background-clip: @clip;
	-moz-background-clip: @clip;
	background-clip: @clip;
}

// CSS3 Content Columns
.content-columns(@columnCount, @columnGap: 20px) {
	-webkit-column-count: @columnCount;
	-webkit-column-gap: @columnGap;
	-moz-column-count: @columnCount;
	-moz-column-gap: @columnGap;
	column-count: @columnCount;
	column-gap: @columnGap;
}

// Buttons
.button(@color: #fff, @padding: 4px 14px, @textColor: #333, @textShadow: 0 1px 1px rgba(255,255,255,.75), @fontSize: 13px, @borderColor: rgba(0,0,0,.1), @borderRadius: 4px) {
  display: inline-block;
  #gradient > .vertical-three-colors(@color, @color, 0.25, darken(@color, 10%));
  padding: @padding;
  text-shadow: @textShadow;
  color: @textColor;
  font-size: @fontSize;
  line-height: @baseline;
  border: 1px solid @borderColor;
  border-bottom-color: fadein(@borderColor, 15%);
  .border-radius(@borderRadius);
  @shadow: inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05);
  .box-shadow(@shadow);
  &:hover {
    background-position: 0 -15px;
    color: @textColor;
    text-decoration: none;
  }
}

// Add an alphatransparency value to any background or border color (via Elyse Holladay)
#translucent {
  .background(@color: @white, @alpha: 1) {
    background-color: hsla(hue(@color), saturation(@color), lightness(@color), @alpha);
	}
	.border(@color: @white, @alpha: 1) {
		border-color: hsla(hue(@color), saturation(@color), lightness(@color), @alpha);
		background-clip: padding-box;
	}
}

// Gradients
#gradient {
  .horizontal (@startColor: #555, @endColor: #333) {
    background-color: @endColor;
    background-repeat: repeat-x;
    background-image: -khtml-gradient(linear, left top, right top, from(@startColor), to(@endColor)); // Konqueror
    background-image: -moz-linear-gradient(left, @startColor, @endColor); // FF 3.6+
    background-image: -ms-linear-gradient(left, @startColor, @endColor); // IE10
    background-image: -webkit-gradient(linear, left top, right top, color-stop(0%, @startColor), color-stop(100%, @endColor)); // Safari 4+, Chrome 2+
    background-image: -webkit-linear-gradient(left, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(left, @startColor, @endColor); // Opera 11.10
    -ms-filter: %("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",@startColor,@endColor); // IE8+
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",@startColor,@endColor)); // IE6 & IE7
    background-image: linear-gradient(left, @startColor, @endColor); // Le standard
  }
  .vertical (@startColor: #555, @endColor: #333) {
    background-color: @endColor;
    background-repeat: repeat-x;
    background-image: -khtml-gradient(linear, left top, left bottom, from(@startColor), to(@endColor)); // Konqueror
    background-image: -moz-linear-gradient(@startColor, @endColor); // FF 3.6+
    background-image: -ms-linear-gradient(@startColor, @endColor); // IE10
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, @startColor), color-stop(100%, @endColor)); // Safari 4+, Chrome 2+
    background-image: -webkit-linear-gradient(@startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(@startColor, @endColor); // Opera 11.10
    -ms-filter: %("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",@startColor,@endColor); // IE8+
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",@startColor,@endColor)); // IE6 & IE7
    background-image: linear-gradient(@startColor, @endColor); // The standard
  }
  .directional (@startColor: #555, @endColor: #333, @deg: 45deg) {
    background-color: @endColor;
    background-repeat: repeat-x;
    background-image: -moz-linear-gradient(@deg, @startColor, @endColor); // FF 3.6+
    background-image: -ms-linear-gradient(@deg, @startColor, @endColor); // IE10
    background-image: -webkit-linear-gradient(@deg, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(@deg, @startColor, @endColor); // Opera 11.10
    background-image: linear-gradient(@deg, @startColor, @endColor); // The standard
  }
  .vertical-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 0.5, @endColor: #c3325f) {
    background-color: @endColor;
    background-repeat: no-repeat;
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
    background-image: -webkit-linear-gradient(@startColor, color-stop(@colorStop, @midColor), @endColor);
    background-image: -moz-linear-gradient(@startColor, @midColor @colorStop*100%, @endColor);
    background-image: -ms-linear-gradient(@startColor, color-stop(@midColor, @colorStop), @endColor);
    background-image: -o-linear-gradient(@startColor, color-stop(@midColor, @colorStop), @endColor);
    background-image: linear-gradient(@startColor, color-stop(@midColor, @colorStop), @endColor);
  }
}

// Opacity
.opacity(@opacity: 100) {
	filter: e(%("alpha(opacity=%d)", @opacity));
	-khtml-opacity: @opacity / 100;
	-moz-opacity: @opacity / 100;
	opacity: @opacity / 100;
}