.border-box() {
  background-clip: border-box;

  &,
  & * {
    box-sizing: border-box;
  }

  &:before,
  & *:before,
  &:after,
  & *:after, {
    box-sizing: border-box;
  }
}

.opacity(@opacity) {
  opacity: @opacity;
  @opacity-ie: (@opacity * 100);
  filter: ~"alpha(opacity=@{opacity-ie})";
}

.unstyled-list() {
  margin: 0;
  padding: 0;
  list-style: none;
}

.select-container(@padding) {
  padding-right: @padding;

  > .rw-select {
    width: @padding;
  }

  &.rw-rtl {
    padding-right: 0;
    padding-left: @padding;
  }
}


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

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

.state-hover(@bg: @state-bg-hover, @border-color: @state-border-hover, @color: @state-color-hover) {
  background-color: @bg;
  border-color:           @border-color;
  color:            @color;
}

.state-select(@bg: @state-bg-select, @border-color: @state-border-select, @color: @state-color-select) {
  &,
  &:hover {
    background-color: @bg;
    border-color:     @border-color;
    color:            @color;
  }
}

.state-focus(@bg: @state-bg-focus, @border-color: @state-border-focus, @color: @state-color-focus) {
  &,
  &:hover {
    background-color: @bg;
    border-color:     @border-color;
    color:            @color;
  }
}

.state-disabled() {
  box-shadow: none;
  cursor: not-allowed;
}


.disabled-color(@color) {
  color: lighten(@color, 40%);
  filter: alpha(opacity=7);
  opacity: .7;
}

.clearfix() {
  &:before,
  &:after {
    content: " ";
    display: table;
  }
  &:after {
    clear: both;
  }
}

.placeholder(@color: @input-color-placeholder) {
  // Firefox
  &::-moz-placeholder {
    color: @color;
    opacity: 1; // See https://github.com/twbs/bootstrap/pull/11526
  }
  &:-ms-input-placeholder { color: @color; } // Internet Explorer 10+
  &::-webkit-input-placeholder  { color: @color; } // Safari and Chrome
}

.height-calc(@total, @minus) {
  height: ~"calc(@{total} - @{minus})";

  /** ie8 fallback **/
  margin-top: ~"-@{minus}\9";
  height: ~"@{total}\9";
  /** --- **/
}

.make-btn-state(@hover-color: @btn-bg-hover, @active-shadow: @btn-active-box-shadow) {
  cursor: pointer;

  &:hover,
  &:active, {
    background-color: @btn-bg-hover;
  }

  &:active {
    box-shadow: @btn-active-box-shadow;
  }

  .rw-state-disabled &,
  .rw-state-readonly &,
  fieldset[disabled] & {
    &,
    &:hover,
    &:active {
      cursor: not-allowed;
      background-color: inherit;
      background-image: none;
      box-shadow: none;
    }
  }
}