buttons-computer/sass/_forms.scss

// Forms
.form-group {
  &:not(:last-child) {
    margin-bottom: $layout-spacing;
  }
}

fieldset {
  margin-bottom: $layout-spacing-lg;
}

legend {
  font-size: $font-size-lg;
  font-weight: 500;
  margin-bottom: $layout-spacing-lg;
}

// Form element: Label
.form-label {
  display: block;
  line-height: $line-height;
  padding: $control-padding-y + $border-width 0;
  margin-top: $layout-spacing-sm;

  &.label-sm {
    font-size: $font-size-sm;
    padding: $control-padding-y-sm + $border-width 0;
  }

  &.label-lg {
    font-size: $font-size-lg;
    padding: $control-padding-y-lg + $border-width 0;
  }
}

// Form element: Input
.form-input {
  appearance: none;
  background: $bg-color-light;
  background-image: none;
  border: $border-width solid $border-color-dark;
  border-radius: $border-radius;
  color: $body-font-color;
  display: block;
  font-size: $font-size;
  height: $control-size;
  line-height: $line-height;
  max-width: 100%;
  outline: none;
  padding: $control-padding-y $control-padding-x;
  position: relative;
  transition: background .2s, border .2s, box-shadow .2s, color .2s;
  width: 100%;
  &:focus {
    @include control-shadow();
    border-color: $primary-color;
  }
  &::placeholder {
    color: $gray-color;
  }

  // Input sizes
  &.input-sm {
    font-size: $font-size-sm;
    height: $control-size-sm;
    padding: $control-padding-y-sm $control-padding-x-sm;
  }

  &.input-lg {
    font-size: $font-size-lg;
    height: $control-size-lg;
    padding: $control-padding-y-lg $control-padding-x-lg;
  }

  &.input-inline {
    display: inline-block;
    vertical-align: middle;
    width: auto;
  }

  // Input types
  &[type="file"] {
    height: auto;
  }
}

// Form element: Textarea
textarea.form-input {
  &,
  &.input-lg,
  &.input-sm {
    height: auto;
  }
}

// Form element: Input hint
.form-input-hint {
  color: $gray-color;
  font-size: $font-size-sm;
  margin-top: $unit-1;

  .has-success &,
  .is-success + & {
    color: $success-color;
  }

  .has-error &,
  .is-error + & {
    color: $error-color;
  }
}

// Form element: Select
.form-select {
  appearance: none;
  border: $border-width solid $border-color-dark;
  border-radius: $border-radius;
  color: inherit;
  font-size: $font-size;
  height: $control-size;
  line-height: $line-height;
  outline: none;
  padding: $control-padding-y $control-padding-x;
  vertical-align: middle;
  width: 100%;
  background: $bg-color-light; 
  &:focus {
    @include control-shadow();
    border-color: $primary-color;
  }
  &::-ms-expand {
    display: none;
  }

  // Select sizes
  &.select-sm {
    font-size: $font-size-sm;
    height: $control-size-sm;
    padding: $control-padding-y-sm ($control-icon-size + $control-padding-x-sm) $control-padding-y-sm $control-padding-x-sm;
  }

  &.select-lg {
    font-size: $font-size-lg;
    height: $control-size-lg;
    padding: $control-padding-y-lg ($control-icon-size + $control-padding-x-lg) $control-padding-y-lg $control-padding-x-lg;
  }

  // Multiple select
  &[size],
  &[multiple] {
    height: auto;
    padding: $control-padding-y $control-padding-x;

    option {
      padding: $unit-h $unit-1;
    }
  }
  &:not([multiple]):not([size]) {
    background: $bg-color-light url("data:image/svg+xml;charset=utf8,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%204%205'%3E%3Cpath%20fill='%23667189'%20d='M2%200L0%202h4zm0%205L0%203h4z'/%3E%3C/svg%3E") no-repeat right .35rem center / .4rem .5rem;
    padding-right: $control-icon-size + $control-padding-x;
  }
}

// Form Icons
.has-icon-left,
.has-icon-right {
  position: relative;

  .form-icon {
    height: $control-icon-size;
    margin: 0 $control-padding-y;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: $control-icon-size;
    z-index: $zindex-0 + 1;
  }
}

.has-icon-left {
  .form-icon {
    left: $border-width;
  }

  .form-input {
    padding-left: $control-icon-size + $control-padding-y * 2;
  }
}

.has-icon-right {
  .form-icon {
    right: $border-width;
  }

  .form-input {
    padding-right: $control-icon-size + $control-padding-y * 2;
  }
}

// Form element: Checkbox and Radio
.form-checkbox,
.form-radio,
.form-switch {
  display: block;
  line-height: $line-height;
  margin: ($control-size - $control-size-sm) 0;
  min-height: $control-size-sm;
  padding: (($control-size-sm - $line-height) / 2) $control-padding-x (($control-size-sm - $line-height) / 2) ($control-icon-size + $control-padding-x);
  position: relative;

  input {
    clip: rect(0, 0, 0, 0);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    position: absolute;
    width: 1px;
    &:focus + .form-icon {
      @include control-shadow();
      border-color: $primary-color;
    }
    &:checked + .form-icon {
      background: $primary-color;
      border-color: $primary-color;
    }
  }

  .form-icon {
    border: $border-width solid $border-color-dark;
    cursor: pointer;
    display: inline-block;
    position: absolute;
    transition: background .2s, border .2s, box-shadow .2s, color .2s;
  }

  // Input checkbox, radio and switch sizes
  &.input-sm {
    font-size: $font-size-sm;
    margin: 0;
  }

  &.input-lg {
    font-size: $font-size-lg;
    margin: ($control-size-lg - $control-size-sm) / 2 0;
  }
}

.form-checkbox,
.form-radio {
  .form-icon {
    background: $bg-color-light;
    height: $control-icon-size;
    left: 0;
    top: ($control-size-sm - $control-icon-size) / 2;
    width: $control-icon-size;
  }

  input {
    &:active + .form-icon {
      background: $bg-color-dark;
    }
  }
}
.form-checkbox {
  .form-icon {
    border-radius: $border-radius;
  }

  input {
    &:checked + .form-icon {
      &::before {
        background-clip: padding-box;
        border: $border-width solid $light-color;
        border-left-width: 0;
        border-top-width: 0;
        content: "";
        height: 9px;
        left: 50%;
        margin-left: -3px;
        margin-top: -6px;
        position: absolute;
        top: 50%;
        transform: rotate(45deg);
        width: 6px;
      }
    }
    &:indeterminate + .form-icon {
      background: $primary-color;
      border-color: $primary-color;
      &::before {
        background: $bg-color-light;
        content: "";
        height: 2px;
        left: 50%;
        margin-left: -5px;
        margin-top: -1px;
        position: absolute;
        top: 50%;
        width: 10px;
      }
    }
  }
}
.form-radio {
  .form-icon {
    border-radius: 50%;
  }

  input {
    &:checked + .form-icon {
      &::before {
        background: $bg-color-light;
        border-radius: 50%;
        content: "";
        height: 6px;
        left: 50%;
        position: absolute;
        top: 50%;
        transform: translate(-50%, -50%);
        width: 6px;
      }
    }
  }
}

// Form element: Switch
.form-switch {
  padding-left: ($unit-8 + $control-padding-x);

  .form-icon {
    background: $gray-color;
    background-clip: padding-box;
    border-radius: $unit-2 + $border-width;
    height: $unit-4 + $border-width * 2;
    left: 0;
    top: ($control-size-sm - $unit-4) / 2 - $border-width;
    width: $unit-8;
    &::before {
      background: $bg-color-light;
      border-radius: 50%;
      content: "";
      display: block;
      height: $unit-4;
      left: 0;
      position: absolute;
      top: 0;
      transition: background .2s, border .2s, box-shadow .2s, color .2s, left .2s;
      width: $unit-4;
    }
  }

  input {
    &:checked + .form-icon {
      &::before {
        left: 14px;
      }
    }
    &:active + .form-icon {
      &::before {
        background: $bg-color;
      }
    }
  }
}

// Form element: Input groups
.input-group {
  display: flex;

  .input-group-addon {
    background: $bg-color;
    border: $border-width solid $border-color-dark;
    border-radius: $border-radius;
    line-height: $line-height;
    padding: $control-padding-y $control-padding-x;
    white-space: nowrap;

    &.addon-sm {
      font-size: $font-size-sm;
      padding: $control-padding-y-sm $control-padding-x-sm;
    }

    &.addon-lg {
      font-size: $font-size-lg;
      padding: $control-padding-y-lg $control-padding-x-lg;
    }
  }

  .form-input,
  .form-select {
    flex: 1 1 auto;
    width: 1%;
  }

  .input-group-btn {
    z-index: $zindex-0;
  }

  .form-input,
  .form-select,
  .input-group-addon,
  .input-group-btn {
    &:first-child:not(:last-child) {
      border-bottom-right-radius: 0;
      border-top-right-radius: 0;
    }
    &:not(:first-child):not(:last-child) {
      border-radius: 0;
      margin-left: -$border-width;
    }
    &:last-child:not(:first-child) {
      border-bottom-left-radius: 0;
      border-top-left-radius: 0;
      margin-left: -$border-width;
    }
    &:focus {
      z-index: $zindex-0 + 1;
    }
  }

  .form-select {
    width: auto;
  }

  &.input-inline {
    display: inline-flex;
  }
}

// Form validation states
.form-input,
.form-select {
  .has-success &,
  &.is-success {
    background: lighten($success-color, 53%);
    border-color: $success-color;
    &:focus {
      @include control-shadow($success-color);
    }
  }

  .has-error &,
  &.is-error {
    background: lighten($error-color, 53%);
    border-color: $error-color;
    &:focus {
      @include control-shadow($error-color);
    }
  }
}

.form-checkbox,
.form-radio,
.form-switch {
  .has-error &,
  &.is-error {
    .form-icon {
      border-color: $error-color;
    }

    input {
      &:checked + .form-icon {
        background: $error-color;
        border-color: $error-color;
      }

      &:focus + .form-icon {
        @include control-shadow($error-color);
        border-color: $error-color;
      }
    }
  }
}

.form-checkbox {
  .has-error &,
  &.is-error {
    input {
      &:indeterminate + .form-icon {
        background: $error-color;
        border-color: $error-color;
      }
    }
  }
}

// validation based on :placeholder-shown (Edge doesn't support it yet)
.form-input {
  &:not(:placeholder-shown) {
    &:invalid {
      border-color: $error-color;
      &:focus {
        @include control-shadow($error-color);
        background: lighten($error-color, 53%);
      }

      & + .form-input-hint {
        color: $error-color;
      }
    }
  }
}

// Form disabled and readonly
.form-input,
.form-select {
  &:disabled,
  &.disabled {
    background-color: $bg-color-dark;
    cursor: not-allowed;
    opacity: .5;
    color: $black !important;
  }
}

.form-input {
  &[readonly] {
    background-color: $bg-color;
  }
}

input {
  &:disabled,
  &.disabled {
    & + .form-icon {
      background: $bg-color-dark;
      cursor: not-allowed;
      opacity: .5;
    }
  }
}

.form-switch {
  input {
    &:disabled,
    &.disabled {
      & + .form-icon::before {
        background: $bg-color-light;
      }
    }
  }
}

// Form horizontal
.form-horizontal {
  padding: $layout-spacing 0;

  .form-group {
    display: flex;
    flex-wrap: wrap;
  }
}

// Form inline
.form-inline {
  display: inline-block;
}