@mixin gradient($start-color, $end-color) {
  background: $start-color;
  background: -moz-linear-gradient(top, $start-color 0%, $end-color 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, $start-color), color-stop(100%, $end-color));
  background: -webkit-linear-gradient(top, $start-color 0%, $end-color 100%);
  background: -o-linear-gradient(top, $start-color 0%, $end-color 100%);
  background: -ms-linear-gradient(top, $start-color 0%, $end-color 100%);
  background: linear-gradient(to bottom, $start-color 0%, $end-color 100%);
  // filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='$start-color', endColorstr='$end-color', GradientType=0);
}
@mixin gradient-horizontal($start-color: #fff, $end-color: #eee, $start-percent: 0%, $end-percent: 100%) {
  background: $start-color;
  background-image: -webkit-linear-gradient(left, $start-color $start-percent, $end-color $end-percent); // Safari 5.1-6, Chrome 10+
  background-image: -o-linear-gradient(left, $start-color $start-percent, $end-color $end-percent); // Opera 12
  background-image: linear-gradient(to right, $start-color $start-percent, $end-color $end-percent); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+
  background-repeat: repeat-x;
  // filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#{ie-hex-str($start-color)}', endColorstr='#{ie-hex-str($end-color)}', GradientType=1); // IE9 and down
}
@mixin gradient-vertical($start-color: #fff, $end-color: #eee, $start-percent: 0%, $end-percent: 100%) {
  background: $start-color;
  background-image: -webkit-linear-gradient(top, $start-color $start-percent, $end-color $end-percent);  // Safari 5.1-6, Chrome 10+
  background-image: -o-linear-gradient(top, $start-color $start-percent, $end-color $end-percent);  // Opera 12
  background-image: linear-gradient(to bottom, $start-color $start-percent, $end-color $end-percent); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+
  background-repeat: repeat-x;
  // filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#{ie-hex-str($start-color)}', endColorstr='#{ie-hex-str($end-color)}', GradientType=0); // IE9 and down
}
@mixin gradient-directional($start-color: #fff, $end-color: #eee, $deg: 45deg) {
  background: $start-color;
  background-repeat: repeat-x;
  background-image: -webkit-linear-gradient($deg, $start-color, $end-color); // Safari 5.1-6, Chrome 10+
  background-image: -o-linear-gradient($deg, $start-color, $end-color); // Opera 12
  background-image: linear-gradient($deg, $start-color, $end-color); // Standard, IE10, Firefox 16+, Opera 12.10+, Safari 7+, Chrome 26+
}
@mixin gradient-horizontal-three-colors($start-color: #00b3ee, $mid-color: #7a43b6, $color-stop: 50%, $end-color: #c3325f) {
  background: $start-color;
  background-image: -webkit-linear-gradient(left, $start-color, $mid-color $color-stop, $end-color);
  background-image: -o-linear-gradient(left, $start-color, $mid-color $color-stop, $end-color);
  background-image: linear-gradient(to right, $start-color, $mid-color $color-stop, $end-color);
  background-repeat: no-repeat;
  // filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#{ie-hex-str($start-color)}', endColorstr='#{ie-hex-str($end-color)}', GradientType=1); // IE9 and down, gets no color-stop at all for proper fallback
}
@mixin gradient-vertical-three-colors($start-color: #00b3ee, $mid-color: #7a43b6, $color-stop: 50%, $end-color: #c3325f) {
  background: $start-color;
  background-image: -webkit-linear-gradient($start-color, $mid-color $color-stop, $end-color);
  background-image: -o-linear-gradient($start-color, $mid-color $color-stop, $end-color);
  background-image: linear-gradient($start-color, $mid-color $color-stop, $end-color);
  background-repeat: no-repeat;
  // filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#{ie-hex-str($start-color)}', endColorstr='#{ie-hex-str($end-color)}', GradientType=0); // IE9 and down, gets no color-stop at all for proper fallback
}
@mixin gradient-radial($inner-color: #fff, $outer-color: #eee) {
  background: $start-color;
  background-image: -webkit-radial-gradient(circle, $inner-color, $outer-color);
  background-image: radial-gradient(circle, $inner-color, $outer-color);
  background-repeat: no-repeat;
}
@mixin gradient-striped($color: rgba(255,255,255,.15), $angle: 45deg) {
  background: $start-color;
  background-image: -webkit-linear-gradient($angle, $color 25%, transparent 25%, transparent 50%, $color 50%, $color 75%, transparent 75%, transparent);
  background-image: -o-linear-gradient($angle, $color 25%, transparent 25%, transparent 50%, $color 50%, $color 75%, transparent 75%, transparent);
  background-image: linear-gradient($angle, $color 25%, transparent 25%, transparent 50%, $color 50%, $color 75%, transparent 75%, transparent);
}