//
 // Button groups
 // --------------------------------------------------
 
 // Make the div behave like a button
 .btn-group,
 .btn-group-vertical {
   position: relative;
   display: inline-block;
   vertical-align: middle; // match .btn alignment given font-size hack above
   > .btn {
     position: relative;
     float: left;
     // Bring the "active" button to the front
     &:hover,
     &:focus,
     &:active,
     &.active {
       z-index: 2;
     }
   }
 }
 
 // Prevent double borders when buttons are next to each other
 .btn-group {
   .btn + .btn,
   .btn + .btn-group,
   .btn-group + .btn,
   .btn-group + .btn-group {
     margin-left: -1px;
   }
 }
 
 // Optional: Group multiple button groups together for a toolbar
 .btn-toolbar {
   margin-left: -5px; // Offset the first child's margin
   &:extend(.clearfix all);
 
   .btn,
   .btn-group,
   .input-group {
     float: left;
   }
   > .btn,
   > .btn-group,
   > .input-group {
     margin-left: 5px;
   }
 }
 
 .btn-group > .btn:not(:first-child):not(:last-child):not(.dropdown-toggle) {
   border-radius: 0;
 }
 
 // Set corners individual because sometimes a single button can be in a .btn-group and we need :first-child and :last-child to both match
 .btn-group > .btn:first-child {
   margin-left: 0;
   &:not(:last-child):not(.dropdown-toggle) {
     .border-right-radius(0);
   }
 }
 // Need .dropdown-toggle since :last-child doesn't apply given a .dropdown-menu immediately after it
 .btn-group > .btn:last-child:not(:first-child),
 .btn-group > .dropdown-toggle:not(:first-child) {
   .border-left-radius(0);
 }
 
 // Custom edits for including btn-groups within btn-groups (useful for including dropdown buttons within a btn-group)
 .btn-group > .btn-group {
   float: left;
 }
 .btn-group > .btn-group:not(:first-child):not(:last-child) > .btn {
   border-radius: 0;
 }
 .btn-group > .btn-group:first-child:not(:last-child) {
   > .btn:last-child,
   > .dropdown-toggle {
     .border-right-radius(0);
   }
 }
 .btn-group > .btn-group:last-child:not(:first-child) > .btn:first-child {
   .border-left-radius(0);
 }
 
 // On active and open, don't show outline
 .btn-group .dropdown-toggle:active,
 .btn-group.open .dropdown-toggle {
   outline: 0;
 }
 
 
 // Sizing
 //
 // Remix the default button sizing classes into new ones for easier manipulation.
 
 .btn-group-xs > .btn { &:extend(.btn-xs); }
 .btn-group-sm > .btn { &:extend(.btn-sm); }
 .btn-group-lg > .btn { &:extend(.btn-lg); }
 
 
 // Split button dropdowns
 // ----------------------
 
 // Give the line between buttons some depth
 .btn-group > .btn + .dropdown-toggle {
   padding-left: 8px;
   padding-right: 8px;
 }
 .btn-group > .btn-lg + .dropdown-toggle {
   padding-left: 12px;
   padding-right: 12px;
 }
 
 // The clickable button for toggling the menu
 // Remove the gradient and set the same inset shadow as the :active state
 .btn-group.open .dropdown-toggle {
   .box-shadow(inset 0 3px 5px rgba(0,0,0,.125));
 
   // Show no shadow for `.btn-link` since it has no other button styles.
   &.btn-link {
     .box-shadow(none);
   }
 }
 
 
 // Reposition the caret
 .btn .caret {
   margin-left: 0;
 }
 // Carets in other button sizes
 .btn-lg .caret {
   border-width: @caret-width-large @caret-width-large 0;
   border-bottom-width: 0;
 }
 // Upside down carets for .dropup
 .dropup .btn-lg .caret {
   border-width: 0 @caret-width-large @caret-width-large;
 }
 
 
 // Vertical button groups
 // ----------------------
 
 .btn-group-vertical {
   > .btn,
   > .btn-group,
   > .btn-group > .btn {
     display: block;
     float: none;
     width: 100%;
     max-width: 100%;
   }
 
   // Clear floats so dropdown menus can be properly placed
   > .btn-group {
     &:extend(.clearfix all);
     > .btn {
       float: none;
     }
   }
 
   > .btn + .btn,
   > .btn + .btn-group,
   > .btn-group + .btn,
   > .btn-group + .btn-group {
     margin-top: -1px;
     margin-left: 0;
   }
 }
 
 .btn-group-vertical > .btn {
   &:not(:first-child):not(:last-child) {
     border-radius: 0;
   }
   &:first-child:not(:last-child) {
     border-top-right-radius: @btn-border-radius-base;
     .border-bottom-radius(0);
   }
   &:last-child:not(:first-child) {
     border-bottom-left-radius: @btn-border-radius-base;
     .border-top-radius(0);
   }
 }
 .btn-group-vertical > .btn-group:not(:first-child):not(:last-child) > .btn {
   border-radius: 0;
 }
 .btn-group-vertical > .btn-group:first-child:not(:last-child) {
   > .btn:last-child,
   > .dropdown-toggle {
     .border-bottom-radius(0);
   }
 }
 .btn-group-vertical > .btn-group:last-child:not(:first-child) > .btn:first-child {
   .border-top-radius(0);
 }
 
 
 // Justified button groups
 // ----------------------
 
 .btn-group-justified {
   display: table;
   width: 100%;
   table-layout: fixed;
   border-collapse: separate;
   > .btn,
   > .btn-group {
     float: none;
     display: table-cell;
     width: 1%;
   }
   > .btn-group .btn {
     width: 100%;
   }
 
   > .btn-group .dropdown-menu {
     left: auto;
   }
 }
 
 
 // Checkbox and radio options
 //
 // In order to support the browser's form validation feedback, powered by the
 // `required` attribute, we have to "hide" the inputs via `clip`. We cannot use
 // `display: none;` or `visibility: hidden;` as that also hides the popover.
 // Simply visually hiding the inputs via `opacity` would leave them clickable in
 // certain cases which is prevented by using `clip` and `pointer-events`.
 // This way, we ensure a DOM element is visible to position the popover from.
 //
 // See https://github.com/twbs/bootstrap/pull/12794 and
 // https://github.com/twbs/bootstrap/pull/14559 for more information.
 
 [data-toggle="buttons"] {
   > .btn,
   > .btn-group > .btn {
     input[type="radio"],
     input[type="checkbox"] {
       position: absolute;
       clip: rect(0,0,0,0);
       pointer-events: none;
     }
   }
 }