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+//

+// Input groups

+// --------------------------------------------------

+

+// Base styles

+// -------------------------

+.input-group {

+  position: relative; // For dropdowns

+  display: table;

+  border-collapse: separate; // prevent input groups from inheriting border styles from table cells when placed within a table

+

+  // Undo padding and float of grid classes

+  &[class*="col-"] {

+    float: none;

+    padding-left: 0;

+    padding-right: 0;

+  }

+

+  .form-control {

+    // Ensure that the input is always above the *appended* addon button for

+    // proper border colors.

+    position: relative;

+    z-index: 2;

+

+    // IE9 fubars the placeholder attribute in text inputs and the arrows on

+    // select elements in input groups. To fix it, we float the input. Details:

+    // https://github.com/twbs/bootstrap/issues/11561#issuecomment-28936855

+    float: left;

+

+    width: 100%;

+    margin-bottom: 0;

+  }

+}

+

+// Sizing options

+//

+// Remix the default form control sizing classes into new ones for easier

+// manipulation.

+

+.input-group-lg > .form-control,

+.input-group-lg > .input-group-addon,

+.input-group-lg > .input-group-btn > .btn {

+  .input-lg();

+}

+.input-group-sm > .form-control,

+.input-group-sm > .input-group-addon,

+.input-group-sm > .input-group-btn > .btn {

+  .input-sm();

+}

+

+

+// Display as table-cell

+// -------------------------

+.input-group-addon,

+.input-group-btn,

+.input-group .form-control {

+  display: table-cell;

+

+  &:not(:first-child):not(:last-child) {

+    border-radius: 0;

+  }

+}

+// Addon and addon wrapper for buttons

+.input-group-addon,

+.input-group-btn {

+  width: 1%;

+  white-space: nowrap;

+  vertical-align: middle; // Match the inputs

+}

+

+// Text input groups

+// -------------------------

+.input-group-addon {

+  padding: @padding-base-vertical @padding-base-horizontal;

+  font-size: @font-size-base;

+  font-weight: normal;

+  line-height: 1;

+  color: @input-color;

+  text-align: center;

+  background-color: @input-group-addon-bg;

+  border: 1px solid @input-group-addon-border-color;

+  border-radius: @input-border-radius;

+

+  // Sizing

+  &.input-sm {

+    padding: @padding-small-vertical @padding-small-horizontal;

+    font-size: @font-size-small;

+    border-radius: @input-border-radius-small;

+  }

+  &.input-lg {

+    padding: @padding-large-vertical @padding-large-horizontal;

+    font-size: @font-size-large;

+    border-radius: @input-border-radius-large;

+  }

+

+  // Nuke default margins from checkboxes and radios to vertically center within.

+  input[type="radio"],

+  input[type="checkbox"] {

+    margin-top: 0;

+  }

+}

+

+// Reset rounded corners

+.input-group .form-control:first-child,

+.input-group-addon:first-child,

+.input-group-btn:first-child > .btn,

+.input-group-btn:first-child > .btn-group > .btn,

+.input-group-btn:first-child > .dropdown-toggle,

+.input-group-btn:last-child > .btn:not(:last-child):not(.dropdown-toggle),

+.input-group-btn:last-child > .btn-group:not(:last-child) > .btn {

+  .border-right-radius(0);

+}

+.input-group-addon:first-child {

+  border-right: 0;

+}

+.input-group .form-control:last-child,

+.input-group-addon:last-child,

+.input-group-btn:last-child > .btn,

+.input-group-btn:last-child > .btn-group > .btn,

+.input-group-btn:last-child > .dropdown-toggle,

+.input-group-btn:first-child > .btn:not(:first-child),

+.input-group-btn:first-child > .btn-group:not(:first-child) > .btn {

+  .border-left-radius(0);

+}

+.input-group-addon:last-child {

+  border-left: 0;

+}

+

+// Button input groups

+// -------------------------

+.input-group-btn {

+  position: relative;

+  // Jankily prevent input button groups from wrapping with `white-space` and

+  // `font-size` in combination with `inline-block` on buttons.

+  font-size: 0;

+  white-space: nowrap;

+

+  // Negative margin for spacing, position for bringing hovered/focused/actived

+  // element above the siblings.

+  > .btn {

+    position: relative;

+    + .btn {

+      margin-left: -1px;

+    }

+    // Bring the "active" button to the front

+    &:hover,

+    &:focus,

+    &:active {

+      z-index: 2;

+    }

+  }

+

+  // Negative margin to only have a 1px border between the two

+  &:first-child {

+    > .btn,

+    > .btn-group {

+      margin-right: -1px;

+    }

+  }

+  &:last-child {

+    > .btn,

+    > .btn-group {

+      z-index: 2;

+      margin-left: -1px;

+    }

+  }

+}