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

.border-top-left-radius(@radius) {
  -webkit-border-top-left-radius: @radius;
  -moz-border-radius-topleft: @radius;
  border-top-left-radius: @radius;
}

.border-bottom-left-radius(@radius) {
  -webkit-border-bottom-left-radius: @radius;
  -moz-border-radius-bottomleft: @radius;
  border-bottom-left-radius: @radius;
}

.border-left-radius(@radius) {
  .border-top-left-radius(@radius);
  .border-bottom-left-radius(@radius);
}

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

// 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;
  -o-user-select: @select;
  user-select: @select;
}

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

// Gradient Bar Colors for buttons and alerts
.gradientBar(@primaryColor, @secondaryColor, @textColor: #fff, @textShadow: 0 -1px 0 rgba(0,0,0,.25)) {
  color: @textColor;
  text-shadow: @textShadow;
  #gradient > .vertical(@primaryColor, @secondaryColor);
  border-color: @secondaryColor @secondaryColor darken(@secondaryColor, 15%);
  border-color: rgba(0, 0, 0, .1) rgba(0, 0, 0, .1) fadein(rgba(0, 0, 0, .1), 15%);
}

// Gradients
#gradient {
  .horizontal(@startColor: #555, @endColor: #333) {
    background-color: @endColor;
    background-image: -moz-linear-gradient(left, @startColor, @endColor); // FF 3.6+
    background-image: -webkit-gradient(linear, 0 0, 100% 0, from(@startColor), to(@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
    background-image: linear-gradient(to right, @startColor, @endColor); // Standard, IE10
    background-repeat: repeat-x;
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@startColor), argb(@endColor))); // IE9 and down
  }
  .vertical(@startColor: #555, @endColor: #333) {
    background-color: mix(@startColor, @endColor, 60%);
    background-image: -moz-linear-gradient(top, @startColor, @endColor); // FF 3.6+
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), to(@endColor)); // Safari 4+, Chrome 2+
    background-image: -webkit-linear-gradient(top, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(top, @startColor, @endColor); // Opera 11.10
    background-image: linear-gradient(to bottom, @startColor, @endColor); // Standard, IE10
    background-repeat: repeat-x;
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor), argb(@endColor))); // IE9 and down
  }
  .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: -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); // Standard, IE10
  }
  .horizontal-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
    background-color: mix(@midColor, @endColor, 80%);
    background-image: -webkit-gradient(left, linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
    background-image: -webkit-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
    background-image: -moz-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
    background-image: -o-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
    background-image: linear-gradient(to right, @startColor, @midColor @colorStop, @endColor);
    background-repeat: no-repeat;
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor), argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
  }

  .vertical-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
    background-color: mix(@midColor, @endColor, 80%);
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
    background-image: -webkit-linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-image: -moz-linear-gradient(top, @startColor, @midColor @colorStop, @endColor);
    background-image: -o-linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-image: linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-repeat: no-repeat;
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor), argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
  }
  .radial(@innerColor: #555, @outerColor: #333) {
    background-color: @outerColor;
    background-image: -webkit-gradient(radial, center center, 0, center center, 460, from(@innerColor), to(@outerColor));
    background-image: -webkit-radial-gradient(circle, @innerColor, @outerColor);
    background-image: -moz-radial-gradient(circle, @innerColor, @outerColor);
    background-image: -o-radial-gradient(circle, @innerColor, @outerColor);
    background-repeat: no-repeat;
  }
  .striped(@color: #555, @angle: 45deg) {
    background-color: @color;
    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: -o-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
.reset-filter() {
  filter: e(%("progid:DXImageTransform.Microsoft.gradient(enabled = false)"));
}

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

// Horizontal dividers
// -------------------------
// Dividers (basically an hr) within dropdowns and nav lists
.nav-divider(@top: #e5e5e5, @bottom: @white) { // IE7 needs a set width since we gave a height. Restricting just
// to IE7 to keep the 1px left/right space in other browsers.
// It is unclear where IE is getting the extra space that we need
// to negative-margin away, but so it goes.
  *width: 100%;
  height: 1px;
  margin: ((@baseLineHeight / 2) - 1) 1px; // 8px 1px
  *margin: -5px 0 5px;
  overflow: hidden;
  background-color: @top;
  border-bottom: 1px solid @bottom;
}

// Button backgrounds
// ------------------
.buttonBackground(@startColor, @endColor, @textColor: #fff, @textShadow: 0 -1px 0 rgba(0,0,0,.25)) { // gradientBar will set the background to a pleasing blend of these, to support IE<=9
  .gradientBar(@startColor, @endColor, @textColor, @textShadow);
  *background-color: @endColor; /* Darken IE7 buttons by default so they stand out more given they won't have borders */
  .reset-filter(); // in these cases the gradient won't cover the background, so we override
  &:hover, &:focus, &:active, &.active, &.disabled, &[disabled] {
    color: @textColor;
    background-color: @endColor;
    *background-color: darken(@endColor, 5%);
  }

// IE 7 + 8 can't handle box-shadow to show active, so we darken a bit ourselves
  &:active,
  &.active {
    background-color: darken(@endColor, 10%) e("\9");
  }
}

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

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

// Centered container element
.container-fixed() {
  margin-right: auto;
  margin-left: auto;
  .clearfix();
}

// Table columns
.tableColumns(@columnSpan: 1) {
  float: none; // undo default grid column styles
  width: ((@gridColumnWidth) * @columnSpan) + (@gridGutterWidth * (@columnSpan - 1)) - 16; // 16 is total padding on left and right of table cells
  margin-left: 0; // undo default grid column styles
}

// Make a Grid
// Use .makeRow and .makeColumn to assign semantic layouts grid system behavior
.makeRow() {
  margin-left: @gridGutterWidth * -1;
  .clearfix();
}

.makeColumn(@columns: 1, @offset: 0) {
  float: left;
  margin-left: (@gridColumnWidth * @offset) + (@gridGutterWidth * (@offset - 1)) + (@gridGutterWidth * 2);
  width: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns - 1));
}

// The Grid
#grid {

  .core (@gridColumnWidth, @gridGutterWidth) {

    .spanX (@index) when (@index > 0) {
      .span@{index} { .span(@index);
      }
      .spanX(@index - 1);
    }
    .spanX (0) {
    }

    .offsetX (@index) when (@index > 0) {
      .offset@{index} { .offset(@index);
      }
      .offsetX(@index - 1);
    }
    .offsetX (0) {
    }

    .offset (@columns) {
      margin-left: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns + 1));
    }

    .span (@columns) {
      width: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns - 1));
    }

    .row {
      margin-left: @gridGutterWidth * -1;
      .clearfix();
    }

    [class*="span"] {
      float: left;
      min-height: 1px; // prevent collapsing columns
      margin-left: @gridGutterWidth;
    }

  // Set the container width, and override it for fixed navbars in media queries
    .container,
    .navbar-static-top .container,
    .navbar-fixed-top .container,
    .navbar-fixed-bottom .container { .span(@gridColumns);
    }

  // generate .spanX and .offsetX
    .spanX (@gridColumns);
    .offsetX (@gridColumns);

  }

  .fluid (@fluidGridColumnWidth, @fluidGridGutterWidth) {

    .spanX (@index) when (@index > 0) {
      .span@{index} { .span(@index);
      }
      .spanX(@index - 1);
    }
    .spanX (0) {
    }

    .offsetX (@index) when (@index > 0) {
      .offset@{index} { .offset(@index);
      }
      .offset@{index}:first-child { .offsetFirstChild(@index);
      }
      .offsetX(@index - 1);
    }
    .offsetX (0) {
    }

    .offset (@columns) {
      margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + (@fluidGridGutterWidth*2);
      *margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%) + (@fluidGridGutterWidth*2) - (.5 / @gridRowWidth * 100 * 1%);
    }

    .offsetFirstChild (@columns) {
      margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + (@fluidGridGutterWidth);
      *margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%) + @fluidGridGutterWidth - (.5 / @gridRowWidth * 100 * 1%);
    }

    .span (@columns) {
      width: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1));
      *width: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%);
    }

    .row-fluid {
      width: 100%;
      .clearfix();
      [class*="span"] {
        .input-block-level();
        float: left;
        margin-left: @fluidGridGutterWidth;
        *margin-left: @fluidGridGutterWidth - (.5 / @gridRowWidth * 100 * 1%);
      }
      [class*="span"]:first-child {
        margin-left: 0;
      }

    // Space grid-sized controls properly if multiple per line
      .controls-row [class*="span"] + [class*="span"] {
        margin-left: @fluidGridGutterWidth;
      }

    // generate .spanX and .offsetX
      .spanX (@gridColumns);
      .offsetX (@gridColumns);
    }

  }

  .input(@gridColumnWidth, @gridGutterWidth) {

    .spanX (@index) when (@index > 0) {
      input.span@{index}, textarea.span@{index}, .uneditable-input.span@{index} { .span(@index);
      }
      .spanX(@index - 1);
    }
    .spanX (0) {
    }

    .span(@columns) {
      width: ((@gridColumnWidth) * @columns) + (@gridGutterWidth * (@columns - 1)) - 14;
    }

    input,
    textarea,
    .uneditable-input {
      margin-left: 0; // override margin-left from core grid system
    }

  // Space grid-sized controls properly if multiple per line
    .controls-row [class*="span"] + [class*="span"] {
      margin-left: @gridGutterWidth;
    }

  // generate .spanX
    .spanX (@gridColumns);

  }
}