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+// 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,

+  .radio,

+  .checkbox,

+  .radio-inline,

+  .checkbox-inline,

+  &.radio label,

+  &.checkbox label,

+  &.radio-inline label,

+  &.checkbox-inline 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;

+  }

+  // Optional feedback icon

+  .form-control-feedback {

+    color: @text-color;

+  }

+}

+

+

+// Form control focus state

+//

+// Generate a customized focus state and for any input with the specified color,

+// which defaults to the `@input-border-focus` 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&,

+  select[multiple]& {

+    height: auto;

+  }

+}