gtk2/gtk/theme/HighContrast/_common.scss

@function gtkalpha($c,$a) {
  @return unquote("alpha(#{$c},#{$a})");
}

$ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);

* {
  padding: 0;
  -GtkToolButton-icon-spacing: 4;
  -GtkTextView-error-underline-color: $error_color;
  -gtk-icon-style: symbolic; //force symbolic style icons

  // The size for scrollbars. The slider is 2px smaller, but we keep it
  // up so that the whole area is sensitive to button presses for the
  // slider. The stepper button is larger in both directions, the slider
  // only in the width

  -GtkScrolledWindow-scrollbar-spacing: 0;

  -GtkToolItemGroup-expander-size: 11;

  -GtkTreeView-horizontal-separator: 4;

  -GtkDialog-button-spacing: 4;
  -GtkDialog-action-area-border: 0;

  // We use the outline properties to signal the focus properties
  // to the adwaita engine: using real CSS properties is faster,
  // and we don't use any outlines for now.

  outline-color: currentColor;
  outline-style: dashed;
  outline-offset: -4px;
  outline-width: 2px;
  -gtk-outline-radius: 2px;

}


/***************
 * Base States *
 ***************/

.background {
    color: $fg_color;
    background-color: $bg_color;
}

.background:backdrop {
    text-shadow: none;
    -gtk-icon-shadow: none;

    color: lighten($fg_color,10%);
    background-color: $backdrop_bg_color;
}

/*
   These wildcard seems unavoidable, need to investigate.
   Wildcards are bad and troublesome, use them with care,
   or better, just don't.
   Everytime a wildcard is used a kitten dies, painfully.
*/



*:disabled {
    -gtk-icon-filter: opacity(0.5);
}

.gtkstyle-fallback {
  background-color: $bg_color;
  color: $fg_color;
  &:hover {
    background-color: lighten($bg_color, 10%);
    color: $fg_color;
  }
  &:active {
    background-color: darken($bg_color, 10%);
    color: $fg_color;
  }
  &:disabled {
    background-color: $insensitive_bg_color;
    color: $insensitive_fg_color;
  }
  &:selected {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
  }
}

.view {
  color: $fg_color;
  background-color: $base_color;
  &:backdrop {
    color: $backdrop_fg_color;
    background-color: $backdrop_base_color;
  }
  &:disabled {
    color: $insensitive_fg_color;
    background-color: $insensitive_bg_color;
  }
  &:selected,
  &:selected:focus,
  &:selected:hover { @extend %selected_items; }
}

textview text {
  @extend .view;

  selection,
  selection:focus,
  selection:hover {
    @extend %selected_items;
  }
}

iconview { @extend .view ;}

.rubberband,
rubberband {
  border: 1px solid $selected_bg_color;
  background-color: transparentize($selected_bg_color,0.8);
}

flowbox {
  & rubberband { @extend rubberband; }
  flowboxchild {
    padding: 3px;
    border-radius: 3px;
    &:selected {
      @extend %selected_items;
      outline-offset: -2px;
    }
  }
}

label {
  & selection,
  & selection:focus,
  & selection:hover,
  & selection:backdrop {
    @extend %selected_items;
  }
  &:disabled, &:backdrop:disabled {
    color: $insensitive_fg_color;
  }
}

%osd, .osd {
  color: $osd_fg_color;
  border: none;
  background-color: $osd_bg_color;
  background-clip: padding-box;
  //text-shadow: 0 1px black;
  //-gtk-icon-shadow: 0 1px black;

  &:backdrop {
    text-shadow: none;
    -gtk-icon-shadow: none;
  }
}

/*********************
 * Spinner Animation *
 *********************/

@keyframes spin {
    to { -gtk-icon-transform: rotate(1turn); }
}

spinner {
  background-image: none;
  opacity: 0; // non spinning spinner makes no sense
  -gtk-icon-source: -gtk-icontheme('process-working-symbolic');
  &:checked {
    opacity: 1;
    animation: spin 1s linear infinite;
    &:disabled {
      opacity: 0.5;
    }
  }
}

/****************
 * Text Entries *
 ****************/

%entry,
entry {
  %entry_basic, & {
    min-height: 32px;
    padding-left: 8px;
    padding-right: 8px;
    border: 1px solid;
    border-radius: 3px;
    transition: all 200ms $ease-out-quad;

    @include entry(normal);

    image { // icons inside the entry
      &.left { padding-left: 0; padding-right: 6px; }
      &.right { padding-left: 6px; padding-right: 0; }
    }

    undershoot {
      &.left { @include undershoot(left); }
      &.right { @include undershoot(right); }
    }

    &.flat {
      &:focus, & {
        min-height: 0;
        padding: 2px;
        background-image: none;
        border-color: transparent;
        border-radius: 0;
      }
    }

    &:focus { @include entry(focus); }

    &:disabled { @include entry(insensitive); }

    &:backdrop { @include entry(backdrop); }

    &:backdrop:disabled { @include entry(backdrop-insensitive); }

    selection { &:focus, & { @extend %selected_items; }}

    // entry error and warning style
    @each $e_type, $e_color in (error, $error_color),
                               (warning, $warning_color) {
      &.#{$e_type} {
        color: $e_color;
        border-color: entry_focus_border($e_color);

        &:focus { @include entry(focus, $e_color); }

        &:selected { &:focus, & { background-color: $e_color; }}
      }
    }

    & image { // entry icons colors
      color: mix($fg_color, $base_color, 80%);

      &:hover { color: $fg_color; }

      &:active { color: $selected_bg_color; }

      &:backdrop { color: mix($backdrop_fg_color, $backdrop_base_color, 80%); }
    }

    &:drop(active) {
      &:focus, & {
        border-color: $fg_color;
        box-shadow: inset 0 0 0 1px $fg_color;
      }
    }

    .osd & {
      @include entry(osd);

      &:focus { @include entry(osd-focus); }

      &:backdrop { @include entry(osd-backdrop); }

      &:disabled { @include entry(osd-insensitive); }
    }
  }

  progress {
    margin: 2px -6px;
    background-color: transparent;
    background-image: none;
    border-radius: 0;
    border-width: 0 0 2px;
    border-color: $selected_bg_color;
    border-style: solid;
    box-shadow: none;

    &:backdrop { background-color: transparent; }
  }

   // linked entries
  .linked:not(.vertical) > & { @extend %linked; }
  .linked:not(.vertical) > &:focus + &,
  .linked:not(.vertical) > &:focus + button,
  .linked:not(.vertical) > &:focus + combobox > box > button.combo { border-left-color: entry_focus_border(); }

  .linked:not(.vertical) > &:drop(active) + &,
  .linked:not(.vertical) > &:drop(active) + button,
  .linked:not(.vertical) > &:drop(active) + combobox > box > button.combo { border-left-color: $fg_color; }

  // Vertically linked entries
  // FIXME: take care of "colored" entries
  .linked.vertical > & {
    @extend %linked_vertical;

    // brighter border between linked entries
    &:not(:disabled) + entry:not(:disabled),
    &:not(:disabled) + %entry:not(:disabled) {
      border-top-color: mix($borders_color, $base_color, 30%);
      background-image: _solid($base_color);

      &:backdrop {
        border-top-color: mix($backdrop_borders_color, $backdrop_base_color, 30%);
        background-image: _solid($backdrop_base_color);
      }
    }

    // brighter border between linked insensitive entries
    &:disabled + %entry:disabled,
    &:disabled + entry:disabled { border-top-color: mix($borders_color, $base_color, 30%); }

    // color back the top border of a linked focused entry following another entry and add back the focus shadow.
    // :not(:only-child) is a specificity bump hack.
    + %entry:focus:not(:only-child),
    + entry:focus:not(:only-child) { border-top-color: entry_focus_border(); }

    + %entry:drop(active):not(:only-child),
    + entry:drop(active):not(:only-child) { border-top-color: $fg_color; }

    // this takes care of coloring the top border of the focused entry subsequent widget.
    // :not(:only-child) is a specificity bump hack.
    &:focus:not(:only-child) {
      + %entry,
      + entry,
      + button,
      + combobox > box > button.combo { border-top-color: entry_focus_border(); }
    }

    &:drop(active):not(:only-child) {
      + %entry,
      + entry,
      + button,
      + combobox > box > button.combo { border-top-color: $fg_color; }
    }
  }
}

/***********
 * Buttons *
 ***********/
// stuff for .needs-attention
$_dot_color: $selected_bg_color;

@keyframes needs_attention {
  from { background-image: radial-gradient($_dot_color 0%, transparentize($_dot_color, 1) 0%); }
  to { background-image: radial-gradient($_dot_color 68%, transparentize($_dot_color, 1) 70%); }
}


button {
  @at-root %button_basic, & {
    $_button_transition: all 200ms $ease-out-quad;

    min-height: 24px;
    min-width: 16px;
    padding: 4px 8px;
    border: 1px solid;
    border-radius: 3px;
    transition: $_button_transition;

    @include button(normal);

    &:disabled {
      @include button(insensitive);

      &:active,
      &:checked { @include button(insensitive-active); }
    }

    &:backdrop {
      @include button(backdrop);

      -gtk-icon-effect: none;

      &:active,
      &:checked { @include button(backdrop-active); }

      &:disabled {
        @include button(backdrop-insensitive);

        &:active,
        &:checked { @include button(backdrop-insensitive-active); }
      }
    }

    &.flat {
      @include button(undecorated);

      // to avoid adiacent buttons borders clashing when transitioning, the transition on the normal state is set
      // to none, while it's added back in the hover state, so the button decoration will fade in on hover, but
      // it won't fade out when the pointer leave the button allocation area. To make the transition more evident
      // in this case the duration is increased.
      transition: none;

      &:hover {
        transition: $_button_transition;
        transition-duration: 500ms;

        &:active { transition: $_button_transition; }
      }

      &:backdrop,
      &:disabled,
      &:backdrop:disabled {
        @include button(undecorated-insensitive);
      }
    }

    &:hover,
    &.flat:hover {
      @include button(hover);
      -gtk-icon-filter: brightness(1.2);
    }

    &:active,
    &:checked {
      @include button(active);

      transition-duration: 50ms;
    }

    &.image-button {
      min-width: 24px;
      padding-left: 4px;
      padding-right: 4px;
    }

    &.text-button {
      padding-left: 16px;
      padding-right: 16px;
    }

    &.text-button.image-button {
      padding-left: 8px;
      padding-right: 8px;

      label {
        padding-left: 8px;
        padding-right: 8px;
      }
    }

    &:drop(active) {
      color: $fg_color;
      border-color: $fg_color;
      box-shadow: inset 0 0 0 1px $fg_color;
    }
  }

  @at-root %button_selected, & {
    row:selected & {
      @if $variant == 'light' { border-color: $selected_borders_color; }

      &.flat:not(:active):not(:checked):not(:hover):not(disabled) {
        color: $selected_fg_color;
        border-color: transparent;

        &:backdrop { color: if($variant=='light', $backdrop_base_color, $backdrop_fg_color); }
      }
    }
  }


  // big standalone buttons like in Documents pager
  &.osd {
    &.image-button {
      min-height: 48px;
      min-width: 48px;
    }

    color: $osd_fg_color;
    border-radius: 5px;

    @include button(osd);

    border: none;
    box-shadow: none;

    &:hover {
      @include button(osd-hover);

      border: none;
      box-shadow: none;
    }

    &:active,
    &:checked {
      @include button(osd-active);

      border: none;
      box-shadow: none;
    }

    &:disabled {
      &:backdrop, & {
        @include button(osd-insensitive);

        border: none;
      }
    }

    &:backdrop {
      @include button(osd-backdrop);

      border: none;
    }
  }

  //overlay / OSD style
  @at-root %osd_button,
  .osd & {
    @include button(osd);

    &:hover { @include button(osd-hover); }

    &:active,
    &:checked { &:backdrop, & { @include button(osd-active); }}

    &:disabled { &:backdrop, & { @include button(osd-insensitive); }}

    &:backdrop { @include button(osd-backdrop); }

    &.flat {
      @include button(undecorated);

      box-shadow: none; //FIXME respect no edge on the button mixin
      text-shadow: 0 1px black;
      -gtk-icon-shadow: 0 1px black;

      &:hover { @include button(osd-hover); }

      &:disabled {
        @include button(osd-insensitive);
        background-image: none;
        border-color: transparent;
        box-shadow: none;
      }

      &:backdrop { @include button(undecorated); }

      &:active,
      &:checked { @include button(osd-active); }
    }
  }

  // Suggested and Destructive Action buttons
  @each $b_type, $b_color, $f_color in (suggested-action, $selected_bg_color, $selected_fg_color),
                             (destructive-action, $destructive_color, white) {
    &.#{$b_type} {
      @include button(normal, $b_color, $f_color);

      &.flat {
        @include button(undecorated);

        color: $b_color; //FIXME: does it work on the dark variant?
      }

      &:hover { @include button(hover, $b_color, $f_color); }

      &:active,
      &:checked { @include button(active, $b_color, $f_color); }

      &:backdrop,
      &.flat:backdrop {
        @include button(backdrop, $b_color, $f_color);

        &:active,
        &:checked { @include button(backdrop-active, $b_color, $f_color); }

        &:disabled {
          @include button(backdrop-insensitive);

          &:active,
          &:checked { @include button(backdrop-insensitive-active, $b_color, $f_color); }
        }
      }

      &.flat {
        &:backdrop, &:disabled, &:backdrop:disabled {
          @include button(undecorated);

          color: transparentize($b_color, 0.2);
        }
      }

      &:disabled {
        @include button(insensitive);

        &:active,
        &:checked { @include button(insensitive-active, $b_color, $f_color); }
      }

      .osd & {
        @include button(osd, $b_color);

        &:hover { @include button(osd-hover, $b_color); }

        &:active,
        &:checked { &:backdrop, & { @include button(osd-active, $b_color); }}

        &:disabled { &:backdrop, & { @include button(osd-insensitive, $b_color); }}

        &:backdrop { @include button(osd-backdrop, $b_color); }
      }
    }
  }

  .stack-switcher > & {
    // to position the needs attention dot, padding is added to the button
    // child, a label needs just lateral padding while an icon needs vertical
    // padding added too.

    outline-offset: -3px; // needs to be set or it gets overriden by GtkRadioButton outline-offset

    > label {
      padding-left: 6px;  // label padding
      padding-right: 6px; //
    }

    > image {
      padding-left: 6px;   // image padding
      padding-right: 6px;  //
      padding-top: 3px;    //
      padding-bottom: 3px; //
    }

    &.text-button {
      // compensate text-button paddings
      padding-left: 10px;
      padding-right: 10px;
    }

    &.image-button {
      // we want image buttons to have a 1:1 aspect ratio, so compensation
      // of the padding added to the GtkImage is needed
      padding-left: 2px;
      padding-right: 2px;
    }

    &.needs-attention {
      > label,
      > image { @extend %needs_attention; }

      &:active,
      &:checked {
        > label,
        > image {
          animation: none;
          background-image: none;
        }
      }
    }
  }

  //inline-toolbar buttons
  .inline-toolbar &, .inline-toolbar &:backdrop {
    border-radius: 2px;
    border-width: 1px;
    @extend %linked;
  }

  .primary-toolbar & { -gtk-icon-shadow: none; } // tango icons don't need shadows

  .linked > &,
  .linked > &:hover,
  .linked > &:active,
  .linked > &:checked,
  .linked > &:backdrop { @extend %linked; }

  .linked.vertical > &,
  .linked.vertical > &:hover,
  .linked.vertical > &:active,
  .linked.vertical > &:checked,
  .linked.vertical > &:backdrop { @extend %linked_vertical; }
}

%needs_attention {
  animation: needs_attention 150ms ease-in;
  background-image: radial-gradient($_dot_color 68%, transparentize($_dot_color,1 ) 70%);
  background-size: 6px 6px;
  background-repeat: no-repeat;

  background-position: right 3px;

  &:backdrop { background-size: 6px 6px;}

  &:dir(rtl) { background-position: left 3px; }
}


// all the following is for the +|- buttons on inline toolbars, that way
// should really be deprecated...
.inline-toolbar toolbutton > button { // redefining the button look is
                                      // needed since those are flat...
  @include button(normal);

  &:hover { @include button(hover); }

  &:active,
  &:checked{ @include button(active); }

  &:disabled {
    @include button(insensitive);

    &:active,
    &:checked { @include button(insensitive-active); }
  }

  &:backdrop {
    @include button(backdrop);

    &:active,
    &:checked { @include button(backdrop-active); }

    &:disabled {
      @include button(backdrop-insensitive);

      &:active,
      &:checked { @include button(backdrop-insensitive-active); }
    }
  }
}

// More inline toolbar buttons
toolbar.inline-toolbar toolbutton,
toolbar.inline-toolbar toolbutton:backdrop {
  & > button.flat { @extend %linked_middle; }

  &:first-child > button.flat { @extend %linked:first-child; }

  &:last-child > button.flat { @extend %linked:last-child; }

  &:only-child > button.flat { @extend %linked:only-child; }
}

%linked_middle {
  border-radius: 0;
  border-right-style: none;
}

%linked {
  @extend %linked_middle;

  &:first-child {
    border-top-left-radius: 3px;
    border-bottom-left-radius: 3px;
  }

  &:last-child {
    border-top-right-radius: 3px;
    border-bottom-right-radius: 3px;
    border-right-style: solid;
  }

  &:only-child {
    border-radius: 3px;
    border-style: solid;
  }
}

%linked_vertical_middle {
  border-style: solid solid none solid;
  border-radius: 0;
}

%linked_vertical{
  @extend %linked_vertical_middle;

  &:first-child {
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
  }

  &:last-child {
    border-bottom-left-radius: 3px;
    border-bottom-right-radius: 3px;
    border-style: solid;
  }

  &:only-child {
    border-radius: 3px;
    border-style: solid;
  }
}

%undecorated_button {
  background-color: transparent;
  background-image: none;
  border-color: transparent;
  box-shadow: inset 0 1px transparentize(white,1),
              0 1px transparentize(white, 1);
  text-shadow: none;
  -gtk-icon-shadow: none;
}

/* menu buttons */
modelbutton.flat,
.menuitem.button.flat {
  min-height: 26px;
  padding-left: 5px;
  padding-right: 5px;
  border-radius: 3px;
  outline-offset: -2px;

  @extend %undecorated_button;

  &:hover { background-color: $popover_hover_color; }

  &:selected { @extend %selected_items; }

  &:backdrop,
  &:backdrop:hover { @extend %undecorated_button; }

  // FIXME: remove the following when the checks/radios rewrite lands
  check:last-child,
  radio:last-child { margin-left: 8px; }

  check:first-child,
  radio:first-child { margin-right: 8px; }
}

modelbutton.flat arrow {
  background: none;

  &:hover { background: none; }

  &.left { -gtk-icon-source: -gtk-icontheme("pan-start-symbolic"); }

  &.right { -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); }
}

button.color {
  padding: 4px;

  colorswatch:only-child {
    &, overlay { border-radius: 0; }

    @if $variant == 'light' {
      &:disabled,
      &:backdrop { box-shadow: none; }
    }
  }
}


/*********
 * Links *
 *********/

*:link {
  color: $selected_bg_color; //FIXME use a proper color
  &:hover, &:active, &:visited {
    color: mix($fg_color, $selected_bg_color, 40%); //FIXME same here
  }
  &:backdrop, &:backdrop:hover {
    color: $selected_bg_color;
  }
}

button:link, button:visited {
  color: $suggested_color;
  font-weight: bold;
  @extend %undecorated_button;
  text-shadow: none;
  &:hover, &:active {
    @extend %undecorated_button;
    color: mix($fg_color, $selected_bg_color, 40%); //FIXME same here
    text-shadow: none;
  }
  &:backdrop {
    @extend %undecorated_button; //This shouldn't be needed but avoids
                                 //a weird transition which for some reason
                                 //makes borders blink on hover
    color: $selected_bg_color; //FIXME use a proper color
  }
}

/*****************
 * GtkSpinButton *
 *****************/
spinbutton {
   
  &:not(.vertical) {
    // in this horizontal configuration, the whole spinbutton
    // behaves as the entry, so we extend the entry styling
    // and nuke the style on the internal entry
    @extend %entry;
    border-width: 2px;
    border-color: $borders_color;
    box-shadow: none;
    padding: 0;
    
 
    entry {
      min-width: 28px;
      margin: 0;
      background: none;
      border: none;
      box-shadow: none;
    }

    button {
      min-height: 16px;
      margin: 0;
      padding-bottom: 0;
      padding-top: 0;
      color: mix($fg_color, $base_color, 90%);
      background-image: none;
      border-style: none none none solid;
      border-radius: 0;

      &:dir(rtl) { border-style: none solid none none; }

      &:hover {
        color: $fg_color;
        background-color: $bg_color;
      }

      &:disabled { color: transparentize($insensitive_fg_color, 0.7); }

      &:active {
        background-color: $osd_bg_color;
        color: $osd_fg_color;
      }

      &:backdrop {
        color: $backdrop_fg_color;
        background-color: transparent;
        border-color: transparentize($backdrop_borders_color, 0.7);
      }

      &:backdrop:disabled {
        color: $insensitive_bg_color;
        background-image: none;
        border-style: none none none solid; // It is needed or it gets overridden

        &:dir(rtl) { border-style: none solid none none; }
      }
    }
  }

  // OSD horizontal
  .osd &:not(.vertical) {
    border-color: $osd_borders_color;
    color: $fg_color;
    box-shadow: none;
    
    &:focus, &:active {
      border-color: opacify($osd_borders_color,0.5);
      box-shadow: inset 0 2px 3px -1px transparentize(black, 0.8);
    }
    
    entry {
      box-shadow: none;
      color: $fg_color;
      text-shadow: none;
      &:focus, &:active {
        box-shadow: inset 0 2px 3px -1px transparentize(black, 0.8);
      }
    }
    
    button {
      @include button(undecorated);

      color: $fg_color;
      border-style: none none none solid;
      border-color: transparentize($borders_color,0.8);
      border-radius: 0;
      box-shadow: none;

      &:dir(rtl) { border-style: none solid none none; }

      &:active {
        background-color: $osd_bg_color;
        color: $osd_fg_color;
      }
      &:hover {
        @include button(undecorated);
        
        border-style: none none none solid;
        border-color: transparentize($borders_color,0.8);
        background-color: transparentize($osd_fg_color, 0.9);
        box-shadow: none;
      }

      &:backdrop {
        @include button(undecorated);

        color: $insensitive_fg_color;
        border-color: transparentize($borders_color,0.9);
        box-shadow: none;
        border-style: none none none solid;
      }

      &:disabled {
        //@include button(undecorated);

        color: $insensitive_fg_color;
        border-color: transparentize($borders_color,0.9);
        border-style: none none none solid;
        box-shadow: none;
      }

      &:last-child { border-radius: 0 3px 3px 0; }

      &:dir(rtl):first-child { border-radius: 3px 0 0 3px; }
    }
  }

  // Vertical
  &.vertical {
    // in the vertical configuration, we treat the spinbutton
    // as a box, and tweak the style of the entry in the middle
    // so that it's linked

    // FIXME: this should not be set at all, but otherwise it gets the wrong
    // color
    border-width: 2px;
    border-color: $borders_color;
  
    &:disabled { color: $insensitive_fg_color; }
    &:backdrop:disabled { color: $insensitive_fg_color; }

    &:drop(active) {
      border-color: transparent;
      box-shadow: none;
    }

    entry {
      min-height: 32px;
      min-width: 32px;
      padding: 0;
      border-radius: 0;
      border-color: $borders_color;
    }

    button {
      min-height: 32px;
      min-width: 32px;
      padding: 0;

      &.up { @extend %top_button; }

      &.down { @extend %bottom_button; }
    }

    %top_button {
      border-radius: 3px 3px 0 0;
      border-style: solid solid none solid;
    }

    %bottom_button {
      border-radius: 0 0 3px 3px;
      border-style: none solid solid solid;
    }
  }

  // OSD vertical
  .osd &.vertical button:first-child {
    @include button(osd);

    &:hover { @include button(osd-hover);}

    &:active { @include button(osd-active); }

    &:disabled { @include button(osd-insensitive); }

    &:backdrop { @include button(osd-backdrop); }
  }

  // Misc
  treeview & {
    entry,
    entry:focus {
      padding: 1px;
      border-width: 1px 0;
      border-color: $selected_bg_color;
      border-radius: 0;
      box-shadow: none;
    }
  }
}

/**************
 * ComboBoxes *
 **************/
combobox {
  arrow {
    -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
    min-height: 16px;
    min-width: 16px;
  }

  &.linked {
    button:nth-child(2) {
      &:dir(ltr) { @extend %linked:last-child; }
      &:dir(rtl) { @extend %linked:first-child; }
    }
  }

  &:drop(active) { // FIXME: untested
    box-shadow: none;

    button.combo { @extend %button_basic:drop(active); }
  }
}

.linked > combobox > box > button.combo {
  // the combo is a composite widget so the way we do button linking doesn't
  // work, special case needed. See
  // https://bugzilla.gnome.org/show_bug.cgi?id=733979

  &:dir(ltr),
  &:dir(rtl) { @extend %linked_middle; } // specificity bump
}

.linked:not(.vertical) > combobox:first-child > box > button.combo { @extend %linked:first-child; }
.linked:not(.vertical) > combobox:last-child > box > button.combo { @extend %linked:last-child; }
.linked:not(.vertical) > combobox:only-child > box > button.combo { @extend %linked:only-child; }

.linked.vertical > combobox > box > button.combo { @extend %linked_vertical_middle; }
.linked.vertical > combobox:first-child > box > button.combo { @extend %linked_vertical:first-child;}
.linked.vertical > combobox:last-child > box > button.combo { @extend %linked_vertical:last-child; }
.linked.vertical > combobox:only-child > box > button.combo { @extend %linked_vertical:only-child; }


/************
 * Toolbars *
 ************/
toolbar { //FIXME: why is all this being ignored?
  padding: 6px;
  background-color: $bg_color;
  &.osd {
    background-color: $osd_bg_color;
    border-radius: 6px;
    padding: 12px;
    & label { color: $osd_fg_color; }
  }
  //searchbar & inline-toolbar
  &.inline-toolbar {
    @extend %inset-bar;
    border-width: 0 1px 1px;
    padding: 3px;
    border-radius: 0  0 4px 4px;
  }
  &.vertical {
    border-right: 1px solid $borders_color;
    &:dir(rtl) {
      border-right: none;
      border-left: 1px solid $borders_color;
    }
  }
}

searchbar {
  @extend toolbar;
  border-width: 0 0 1px;
  border-color: $borders_color;
  border-style: none none solid none;
  padding: 3px;
}

%inset-bar {
  border-style: solid;
  border-color: $borders_color;
  $_bg: mix($bg_color, $borders_color, 70%);
  background-color: $_bg;
  box-shadow: inset 0 2px 3px -1px mix($borders_color, $_bg, 60%);
  //FIXME edge would be nice, but doesn't work
  &:backdrop {
    border-color: $backdrop_borders_color;
    background-color: mix($backdrop_borders_color,$backdrop_bg_color, 35%);
    box-shadow: none;
  }
}

/***************
 * Header bars *
 ***************/

%titlebar,
headerbar {
  min-height: 46px;
  border-width: 0 0 1px;
  border-style: solid;
  border-color: $borders_color;
  border-radius: 7px 7px 0 0;

  background-color: transparent;
  background-image: linear-gradient(to bottom,
                                    lighten($bg_color,4%),
                                    $bg_color);
  box-shadow: inset 0 -1px mix($borders_color, $bg_color, 30%), // bottom shade
              inset 0 1px $borders_edge; // top highlight
  padding: 6px;

  &:backdrop {
    border-color: $backdrop_borders_color;
    background-color: $bg_color;
    background-image: none;
    box-shadow: none;
  }

  .title {
    font-weight: bold;
    padding: 0px 12px;
  }
  .subtitle {
    font-size: 80%;
    padding: 0 12px;
  }

  &.selection-mode {
    color: darken($selected_bg_color, 15%);
    text-shadow: 0 1px transparentize(black, 0.5);
    background-image: linear-gradient(to bottom,
                                    lighten($selected_bg_color,5%),
                                    lighten($selected_bg_color,2%));
    box-shadow: inset 0 -1px mix($borders_color,$bg_color, 30%), //bottom shade
                inset 0 1px mix($borders_edge,$selected_bg_color, 50%); //top highlight
    button {
      @include button(normal, $selected_bg_color, $selected_fg_color, $edge: none);
      &:hover { @include button(hover, $selected_bg_color, $selected_fg_color, $edge: none); }
      &:active { @include button(active, $selected_bg_color, $selected_fg_color, $edge: none); }
      &:disabled { @include button(insensitive, $selected_bg_color, $selected_fg_color, $edge: none); }
      &:backdrop {
        @include button(backdrop, $selected_bg_color, $selected_fg_color, $edge: none);
        border-color: darken($selected_bg_color, 15%);
      }
      &:backdrop:disabled { @include button(backdrop-insensitive, $selected_bg_color, $selected_fg_color, $edge: none); }
      &.suggested-action {
        @include button($t:normal, $edge: none);
        &:hover { @include button($t:hover,$edge: none); }
        &:active { @include button($t:active, $edge: none); }
        &:disabled { @include button($t:insensitive, $edge: none); }
        &:backdrop { @include button($t:backdrop, $edge: none); }
        &:backdrop:disabled { @include button($t:backdrop-insensitive, $edge: none); }
      }
    }
    .selection-menu {
      border-width: 0;
      background-image: none;
      box-shadow: none;
    }
  }

  // squared corners when the window is maximized, tiled, or fullscreen
  .tiled &,
  .maximized &,
  .fullscreen & {
    border-radius: 0;
  }

  &.default-decoration {
    min-height: 28px;
    padding: 4px;

    button.titlebutton {
      min-height: 26px;
      min-width: 26px;
      margin: 0;
      padding: 0;
    }
  }
}

.titlebar:not(headerbar) {
  window.csd > & {
    // in csd we assume every titlebar is a headerbar so reset anything, this is needed for split toolbars cases
    padding: 0;
    background-color: transparent;
    background-image: none;
    border-style: none;
    border-color: transparent;
    box-shadow: none;
  }

  @extend %titlebar;
}


/************
 * Pathbars *
 ************/

.path-bar button {
  padding: 5px 6px 6px;
  &:first-child { padding-left: 8px; }
  &:last-child { padding-right: 8px; }
  &:only-child {
    padding-left: 12px;
    padding-right: 12px;
  }

  // the following is for spacing the icon and the label inside the home button
  & label:last-child { padding-left: 2px; }
  & label:first-child { padding-right: 2px; }
  & label:only-child { padding-right: 0; padding-left: 0; }
  image { padding-top: 1px; }
}


/**************
 * Tree Views *
 **************/
treeview.view {
  -GtkTreeView-grid-line-width: 1;
  -GtkTreeView-grid-line-pattern: '';
  -GtkTreeView-tree-line-width: 1;
  -GtkTreeView-tree-line-pattern: '';
  -GtkTreeView-expander-size: 16;

  border-left-color: mix($fg_color, $base_color, 50%); // this is actually the tree lines color,
  border-top-color: $bg_color;                         // while this is the grid lines color, better then nothing

  & rubberband { @extend rubberband; } // to avoid borders being overridden by the previously set props

  &:selected {
    border-radius: 0;
    @extend %selected_items;
  }

  &:selected, &:backdrop:selected {
    border-left-color: mix($selected_fg_color, $selected_bg_color, 50%);
    border-top-color: transparentize($fg_color, 0.9); // doesn't work unfortunatelly
  }

  &:disabled {
    color: $insensitive_fg_color;
    &:selected {
      color: mix($selected_fg_color, $selected_bg_color, 40%);
      &:backdrop { color: mix($selected_fg_color, $selected_bg_color, 50%); }
    }
    &:backdrop { color: $insensitive_fg_color; }
  }

  &.separator:backdrop {
    min-height: 2px;
    color: transparentize(black, 0.9);
  }

  &:backdrop {
    color: $backdrop_fg_color;
    border-left-color: mix($backdrop_fg_color, $backdrop_bg_color, 50%);
    border-top: $backdrop_bg_color;
  }

  &.dnd {
    border-style: solid none;
    border-width: 1px;
    border-color: mix($fg_color, $selected_bg_color, 50%);
  }

  &.expander {
    -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
    &:dir(rtl) { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic-rtl'); }
    color: mix($fg_color, $base_color, 70%);
    &:hover { color: $fg_color; }
    &:selected {
      color: mix($selected_fg_color, $selected_bg_color, 70%);
      &:hover { color: $selected_fg_color; }
      &:backdrop { color: mix($selected_fg_color, $selected_bg_color, 70%); }
    }

    &:checked { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }

    &:backdrop { color: mix($backdrop_fg_color, $backdrop_base_color, 70%); }
  }

  &.progressbar { // progress bar in treeviews
    color: $base_color;

    border: 1px solid $selected_borders_color;
    border-radius: 4px;
    background-color: $fg_color;

    &:selected { color: $selected_bg_color; }
      
    &:backdrop {
      color: $selected_bg_color;
      border-color: $selected_borders_color; // otherwise it gets inherited by .view(?!?)  
      background-color: $backdrop_base_color;
    }
  }
  
  &.trough { // progress bar trough in treeviews
    background-color: transparentize($fg_color,0.9);
    border-radius: 4px;

    &:selected { 
      background-color: transparentize($selected_fg_color, 0.7);
      border-width: 1px 0;
      border-style: solid;
      border-color: $selected_bg_color;
    }
  }

  header {
    button {
      @extend %column_header_button;
      $_column_header_color: mix($fg_color,$base_color,50%);
      color: $_column_header_color;
      font-weight: bold;
      text-shadow: none;
      box-shadow: none;
      &:hover {
        @extend %column_header_button;
        color: mix($_column_header_color,$fg_color,50%);
        box-shadow: none;
      }
      &:active {
        @extend %column_header_button;
        color: $selected_fg_color;
      }
    }
    & button:last-child,
    & button:last-child:hover,
    & button:last-child:backdrop { //treeview-like derived widgets in Banshee and Evolution
      border-right-style: none;
    }
  }
}

%column_header_button {
  padding: 3px 6px;
  border-style: none solid solid none;
  border-radius: 0;
  border-width: 1px;
  background-image: none;
  border-color: mix($backdrop_fg_color, $backdrop_bg_color,50%);
  text-shadow: none;
  &:disabled {
    border-color: $bg_color;
    background-image: none;
  }
  &:backdrop {
    border-color: mix($backdrop_fg_color, $backdrop_bg_color,50%);
    border-style: none solid solid none;
    color: mix($backdrop_fg_color, $backdrop_bg_color,50%);
    background-image: none;
    background-color: $backdrop_base_color;
    &:disabled {
      border-color: $backdrop_bg_color;
      background-image: none;
    }
  }
}

treeview.view.progressbar { //Progressbar in treeview cells
  color: $base_color;
  border-radius: 4px;
  background-image: linear-gradient(to bottom,
                                    $selected_bg_color,
                                    darken($selected_bg_color,10%));
  &:selected {
    color: $selected_bg_color;
    background-image: linear-gradient(to bottom,
                                     $base_color,
                                     darken($base_color,10%));
    &:backdrop {
      color: $selected_bg_color;
      background-image: none;
      background-color: $backdrop_base_color;
    }
  }
  &:backdrop {
    color: $backdrop_base_color;
    background-image: none;
  }
}

/*********
 * Menus *
 *********/
menubar,
.menubar {
  padding: 0px;
  box-shadow: inset 0 -1px $borders_color;
  & > menuitem {
    padding: 4px 8px;
    &:hover { //Seems like it :hover even with keyboard focus
      box-shadow: inset 0 -3px $selected_bg_color;
      color: $selected_bg_color;
    }
    &:disabled {
      color: $insensitive_fg_color;
      box-shadow: none;
    }
  }
}

menu,
.menu {
  margin: 4px;
  padding: 0px;
  background-color: $base_color;
  border: 1px solid $borders_color;
  & menuitem {
    text-shadow: none;
    padding: 4px;
    min-width: 40px;
    &:hover {
      color: $selected_fg_color;
      background-color: $selected_bg_color;
    }
    &:disabled {
      color: $insensitive_fg_color;
      &:backdrop { color: $insensitive_fg_color; }
    }
    &:backdrop, &:backdrop:hover {
      color: $backdrop_fg_color;
      background-color: $backdrop_base_color;
    }
    //submenu indicators
    & arrow {
      min-height: 16px;
      min-width: 16px;
    }
    & arrow:dir(ltr) {
      -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
      margin-left: 10px;
    }
    & arrow:dir(rtl) {
      -gtk-icon-source: -gtk-icontheme('pan-end-symbolic-rtl');
      margin-right: 10px;
    }
  }
}

menuitem {
  & check,
  & radio {
    min-height: 16px;
    min-width: 16px;
    &:dir(ltr) { margin-right: 7px; }
    &:dir(rtl) { margin-left: 7px; }
  }
}

/***************
 * Popovers   *
 ***************/

popover.background {
  padding: 2px;
  border-radius: 5px;
  background-color: $popover_bg_color;

  &, .csd & { border: 1px solid $borders_color; }

  box-shadow: 0 1px 2px transparentize(black, 0.7);

  &:backdrop {
    background-color: $backdrop_bg_color;
    box-shadow: none;
  }

  > list,
  > .view,
  > toolbar {
    border-style: none;
    background-color: transparent;
  }

  &, .csd & {
    &.touch-selection,
    &.magnifier {
      @extend %osd;

      border: 1px solid transparentize(white, 0.9);

      button { @extend %osd_button };
    }

    &.osd { @extend %osd; }
  }

  separator { margin: 3px; }

  list separator { margin: 0px; }

  checkbutton,
  radiobutton { @extend modelbutton.flat; }
}

/*****************
 * Notebooks and *
 * Tabs          *
 *****************/

notebook {
  // Through me you go to the grief wracked city;
  // Through me you go to everlasting pain;
  // Through me you go a pass among lost souls.
  // ...
  // Abandon all hope — Ye Who Enter Here
  padding: 0;
  background-color: $base_color;
  transition: all 200ms ease-out;
  &:backdrop {
    background-color: $backdrop_base_color;
  }
  &.frame {
    border: 1px solid $borders_color;
    &:backdrop { border-color: $backdrop_borders_color; }
  }
  & header {
    // FIXME: double borders in some case, can't fix it w/o a class tho
    // FIXME: doesn't work on dark var
    background-color: mix($bg_color, $borders_color, 70%);

    // this is the shading of the header behind the tabs
    .frame & {
      border: 1px solid $borders_color;
      &.top { border-bottom-width: 0; }
      &.bottom { border-top-width: 0; }
      &.right { border-left-width: 0; }
      &.left { border-right-width: 0; }
      &:backdrop { border-color: $backdrop_borders_color; }
    }

    $_header_shade: inset 0 2px 3px -1px transparentize(black, 0.85);
    &.top {
      box-shadow: $_header_shade,
                  inset 0 -1px $borders_color; // border
      &:backdrop { box-shadow: inset 0 -1px $backdrop_borders_color; }
    }
    &.bottom {
      box-shadow: $_header_shade,
                  inset 0 1px $borders_color;
      &:backdrop { box-shadow: inset 0 1px $backdrop_borders_color; }
    }
    &.right {
      box-shadow: $_header_shade,
                  inset 1px 0 $borders_color;
      &:backdrop { box-shadow: inset 1px 0 $backdrop_borders_color; }
    }
    &.left {
      box-shadow: $_header_shade,
                  inset -1px 0 $borders_color;
      &:backdrop { box-shadow: inset -1px 0 $backdrop_borders_color; }
    }
    &:backdrop {
      // same color as backdrop pushed button
      background-color: mix($backdrop_borders_color,$backdrop_bg_color, 35%);
      box-shadow: none;
    }
    & tabs arrow {
      color: $insensitive_fg_color;
      &:hover { color: mix($fg_color, $insensitive_fg_color, 50%); }
      &:checked { color: $fg_color; }
      &:disabled { color: transparentize($insensitive_fg_color,0.7); }
      &:backdrop { color: transparentize($backdrop_fg_color,0.6); }
    }
  }
  //vertical tab sizing
  $vt_vpadding: 8px;
  $vt_hpadding: 20px;
  // horizontal tab sizing
  $ht_vpadding: 5px;
  $ht_hpadding: 20px;
  $tab_indicator_size: 3px;

  & header.top tab {
    padding: $vt_vpadding $vt_hpadding;
    border-bottom-width: $tab_indicator_size;
    &.reorderable-page {
      padding-left: 12px;  // for a nicer close button
      padding-right: 12px; // placement
      border-left-width: 1px;
      border-right-width: 1px;
    }
  }
  & header.bottom tab {
    padding: $vt_vpadding $vt_hpadding;
    border-top-width: $tab_indicator_size;
    &.reorderable-page {
      padding-left: 12px;  // for a nicer close button
      padding-right: 12px; // placement
      border-left-width: 1px;
      border-right-width: 1px;
    }
  }
  & header.left tab {
    padding: $ht_vpadding $ht_hpadding;
    border-right-width: $tab_indicator_size;
    &.reorderable-page {
      border-bottom-width: 1px;
      border-top-width: 1px;
    }
  }
  & header.right tab {
    padding: $ht_vpadding $ht_hpadding;
    border-left-width: $tab_indicator_size;
    &.reorderable-page {
      border-bottom-width: 1px;
      border-top-width: 1px;
    }
  }

  & tab {
    border-width: 0;
    border-style: solid;
    border-color: transparent;
    background-color: transparent;

    outline-offset: 0;

    //here's the interesting stuff
    &:hover {
      border-color: $borders_color;
    }
    &:checked, &:backdrop:checked {
      border-color: $selected_bg_color;
    }
    &:backdrop {
      background-color: transparent;
      border-color: transparent;
    }
    @each $_tab, $_border in (top, bottom),
                             (bottom, top),
                             (left, right),
                             (right, left) {
      .#{$_tab} &.reorderable-page {
        border-color: transparent;
        &:hover {
          border-color: transparentize($borders_color,0.7);
          border-#{$_border}-color: $borders_color;
          background-color: transparentize($bg_color,0.8);
        }
        &:checked {
          background-color: transparentize($bg_color,0.5);
          border-color: transparentize($borders_color,0.5);
          border-#{$_border}-color: $selected_bg_color;
          &:hover { background-color: transparentize($bg_color,0.3); }
          &:backdrop {
            border-color: $backdrop_borders_color;
            background-color: $backdrop_bg_color;
            border-#{$_border}-color: $selected_bg_color;
          }
        }
        &:backdrop {
          border-color: transparent;
          background-color: transparent;
        }
      }
    }
    label { //tab text
      padding: 0 2px; // needed for a nicer focus ring
      font-weight: bold;
      color: $insensitive_fg_color; /* color: inherit doesn't work here */
      &:backdrop {
        color: $insensitive_fg_color;
      }
    }
    &:hover label {
      // prelight tab text
      color: mix($fg_color, $insensitive_fg_color, 50%);
    }
    &:checked label {
      // active tab text
      color: $fg_color;
      &:backdrop { color: $backdrop_fg_color; }
    }
    button { //tab close button
      border: 2px solid transparent;
      @extend %undecorated_button;
      -gtk-icon-shadow: none;
      transition: none;
      color: transparentize($fg_color,0.7);
      &:hover {
        color:  $fg_color;
        @include button(hover, $edge: none);
        border-width: 2px;
        background-image: none;
        box-shadow: none;
      }
      &:checked {
        @include button(active, $edge: none);
        border-width: 2px;
      }
      &:backdrop, &:backdrop:hover {
        color: transparentize($backdrop_fg_color,0.7);
        border-color: transparent;
        border-width: 2px;
      }
      & > image { // this is a hack which makes tabs grow
        padding: 2px;
      }
    }
  }
}

//.notebook > .frame,
//.notebook > .view { border: none; }

/**************
 * Scrollbars *
 **************/
scrollbar {
  $_slider_min_length: 40px;

  // disable steppers
  @at-root * {
    -GtkScrollbar-has-backward-stepper: false;
    -GtkScrollbar-has-forward-stepper: false;
  }

  background-color: $scrollbar_bg_color;
  transition: 300ms $ease-out-quad;

  // scrollbar border
  &.top { border-bottom: 1px solid $borders_color; }
  &.bottom { border-top: 1px solid $borders_color; }
  &.left { border-right: 1px solid $borders_color; }
  &.right { border-left: 1px solid $borders_color; }

  &:backdrop {
    background-color: $backdrop_scrollbar_bg_color;
    border-color: $backdrop_borders_color;
  }

  // slider
  slider {
    min-width: 14px;
    min-height: 14px;
    margin: -1px;
    border: 4px solid transparent;
    border-radius: 12px;
    background-clip: padding-box;
    background-color: $scrollbar_slider_color;

    &:hover { background-color: $scrollbar_slider_hover_color; }

    &:hover:active { background-color: $scrollbar_slider_active_color; }

    &:backdrop { background-color: $backdrop_scrollbar_slider_color; }

    &:disabled { background-color: transparent; }
  }

  &.fine-tune {
    slider {
      min-width: 4px;
      min-height: 4px;
    }

    &.horizontal slider { border-width: 5px 4px; }
    &.vertical slider { border-width: 4px 5px; }
  }

  &.overlay-indicator {
    &:not(.dragging):not(.hovering) {
      border-color: transparent;
      opacity: 0.4;
      background-color: transparent;

      slider {
        margin: 0;
        min-width: 3px;
        min-height: 3px;
        background-color: $fg_color;
        border: 1px solid if($variant == 'light', white, black);
      }

      button {
        min-width: 5px;
        min-height: 5px;
        background-color: $fg_color;
        background-clip: padding-box;
        border-radius: 100%;
        border: 1px solid if($variant == 'light', white, black);
        -gtk-icon-source: none;
      }

      &.horizontal {
        slider {
          margin: 0 2px;
          min-width: $_slider_min_length;
        }

        button {
          margin: 1px 2px;
          min-width: 5px;
        }
      }

      &.vertical {
        slider {
          margin: 2px 0;
          min-height: $_slider_min_length;
        }

        button {
          margin: 2px 1px;
          min-height: 5px;
        }
      }
    }

    &.dragging,
    &.hovering { opacity: 0.8; }
  }

  &.horizontal slider { min-width: $_slider_min_length; }

  &.vertical slider { min-height: $_slider_min_length; }

  // button styling
  button {
    padding: 0;
    min-width: 12px;
    min-height: 12px;
    border-style: none;
    border-radius: 0;
    transition-property: min-height, min-width, color;

    @include button(undecorated);

    color: $scrollbar_slider_color;

    &:hover {
      @include button(undecorated);

      color: $scrollbar_slider_hover_color;
    }
    &:active, &:checked {
      @include button(undecorated);

      color: $scrollbar_slider_active_color;
    }
    &:disabled {
      @include button(undecorated);

      color: transparentize($scrollbar_slider_color, 0.8);
    }
    &:backdrop {
      @include button(undecorated);

      color: $backdrop_scrollbar_slider_color;

      &:disabled {
        @include button(undecorated);

        color: transparentize($backdrop_scrollbar_slider_color, 0.8);
      }
    }
  }

  // button icons
  &.vertical {
    button {
      &.down { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }

      &.up { -gtk-icon-source: -gtk-icontheme('pan-up-symbolic'); }
    }
  }

  &.horizontal {
    button {
      &.down { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic'); }

      &.up { -gtk-icon-source: -gtk-icontheme('pan-start-symbolic'); }
    }
  }
}

treeview ~ scrollbar.vertical {
  border-top: 1px solid $borders_color;
  margin-top: -1px;
}

/**********
 * Switch *
 **********/

switch {
    font-size: smaller;
    font-stretch: condensed;
    font-weight: bold;
    outline-offset: -4px;
    // similar to the .scale
    border-width: 1px;
    border-style: solid;
    border-radius: 3px;
    border-color: $borders_color;
    background-color: $dark_fill;
    box-shadow: inset 0 1px transparentize(black, 0.9); /*outset not working*/
    text-shadow: 0 1px transparentize(black, 0.9);
    &:active {
        color: $selected_fg_color;
        border-color: $selected_borders_color;
        background-color: $selected_bg_color;
        text-shadow: 0 0 2px white;
    }
    &:disabled {
        color: $insensitive_fg_color;
        border-color: $borders_color;
        background-color: $insensitive_bg_color;
        text-shadow: none;
    }
    &:backdrop {
        color: $backdrop_fg_color;
        border-color: $backdrop_borders_color;
        background-color: $backdrop_bg_color;
        box-shadow: none;
        text-shadow: none;
        &:checked {
          color: $selected_fg_color;
          border-color: $backdrop_borders_color;
          background-color: $backdrop_borders_color;
          box-shadow: none;
        }
        &:disabled, &:disabled:checked {
          background-color: $insensitive_bg_color;
          color: $insensitive_fg_color;
          border-color: $insensitive_fg_color;
        }
    }

    slider {
        margin: -1px;
        min-width: 45px;
        min-height: 27px;
        border: 2px solid;
        border-radius: 3px;
        @include button(normal);
    }

    &:hover slider { @include button(hover); }

    &:checked slider { border: 2px solid $selected_borders_color; }

    &:disabled slider { @include button(insensitive); }

    &:backdrop {
        slider { @include button(backdrop); }

        &:checked slider { border-color: if($variant == 'light', $selected_bg_color, $selected_borders_color); }

        &:disabled slider { @include button(backdrop-insensitive); }
    }
}

/*************************
 * Check and Radio items *
 *************************/
// draw regular check and radio items using our PNG assets
// all assets are rendered from assets.svg. never add pngs directly


checkbutton.text-button, radiobutton.text-button {
  // this is for a nice focus on check and radios text
  padding: 2px 0;
  outline-offset: 0;

  label:not(:only-child) {
    &:first-child { margin-left: 4px; }
    &:last-child { margin-right: 4px; }
  }

  &:disabled {
    &:active, &:indeterminate, & {
      // set insensitive color, which is overriden otherwise
      color: $insensitive_fg_color;

      &:backdrop { color: $insensitive_fg_color; }
    }
  }
}

check,
radio {
  margin: 0 4px;

  &:only-child { margin: 0; }

  min-height: 14px;
  min-width: 14px;
  border: 1px solid;
  -gtk-icon-source: none;

  @include button(normal);

  &:hover { @include button(hover); }
  &:active { @include button(active); }
  &:disabled { @include button(insensitive); }
  &:backdrop {
    @include button(backdrop);

    &:disabled { @include button(backdrop-insensitive); }
  }

  @if $variant == 'light' {
    // the borders of the light variant versions of checks and radios are too similar in luminosity to the selected background
    // color, hence we need special casing.
    row:selected & { border-color: $selected_borders_color; }
  }

  .osd & {
    @include button(osd);

    &:hover { @include button(osd); }
    &:active { @include button(osd-active); }
    &:backdrop { @include button(osd-backdrop); }
    &:disabled { @include button(osd-insensitive); }
  }

  menu menuitem & {
    margin: 0; // this is a workaround for a menu check/radio size allocation issue

    &, &:hover, &:disabled { //FIXME use button reset mixin
      min-height: 14px;
      min-width: 14px;
      background-image: none;
      background-color: transparent;
      box-shadow: none;
      -gtk-icon-shadow: none;
      color: inherit;
      border-color: currentColor;
      animation: none;
    }
  }
}

%check,
check {
  border-radius: 3px;

  &:checked { -gtk-icon-source: image(-gtk-recolor(url("assets/check-symbolic.svg")),
                                      -gtk-recolor(url("assets/check-symbolic.symbolic.png"))); }

  &:indeterminate { -gtk-icon-source: image(-gtk-recolor(url("assets/dash-symbolic.svg")),
                                            -gtk-recolor(url("assets/dash-symbolic.symbolic.png"))); }
}

%radio,
radio {
  border-radius: 100%;

  &:checked { -gtk-icon-source: image(-gtk-recolor(url("assets/bullet-symbolic.svg")),
                                      -gtk-recolor(url("assets/bullet-symbolic.symbolic.png"))); }

  &:indeterminate { -gtk-icon-source: image(-gtk-recolor(url("assets/dash-symbolic.svg")),
                                            -gtk-recolor(url("assets/dash-symbolic.symbolic.png"))); }
}

// let's animate things
@keyframes check_check {
  from { -gtk-icon-transform: translate(6px, -3px) rotate(-45deg) scaleY(0.2) rotate(45deg) scaleX(0); }
  to { -gtk-icon-transform: unset; }
}

@keyframes check_radio {
  from { -gtk-icon-transform: scale(0); }
  to { -gtk-icon-transform: unset; }
}

@keyframes check_indeterminate {
  from { -gtk-icon-transform: scale(0, 1); }
  to { -gtk-icon-transform: unset; }
}

check:not(:indeterminate):checked { animation: check_check 400ms; }

radio:not(:indeterminate):checked { animation: check_radio 400ms; }

check:indeterminate:checked, radio:indeterminate:checked { animation: check_indeterminate 400ms; }

// no animations in menus
menu menuitem {
  check:not(:indeterminate):checked,
  radio:not(:indeterminate):checked,
  check:indeterminate:checked:active,
  radio:indeterminate:checked { animation: none; }
}


// treeview stuff, let's the fun begin:
treeview.view check:selected {
  &:focus, &:backdrop, & {
    &:disabled, & {
      @extend %check;
    }
  }
}

treeview.view radio:selected {
  &:focus, &:backdrop, & {
    &:disabled, & {
      @extend %radio;
    }
  }
}

treeview.view check,
treeview.view radio {
  &:selected {
    &:focus, &:hover, & { color: $selected_fg_color; }

    &:backdrop {
      &:hover, & {
        color: $selected_fg_color;
        border-color: $selected_fg_color;
      }

      &:disabled {
        color: $insensitive_fg_color;
        border-color: $insensitive_fg_color;
      }
    }

    &:disabled { color: $insensitive_fg_color;}
  }
}



/************
 * GtkScale *
 ************/
%scale_trough {
  border: 2px solid $borders_color;
  border-radius: 4px;
  background-color: $dark_fill;
  box-shadow: none;

  &:disabled {
    border-color: $insensitive_borders_color;
    background-color: $insensitive_bg_color;
  }

  &:backdrop {
    background-color: $backdrop_dark_fill;
    border-color: $backdrop_borders_color;

    &:disabled { background-color: $insensitive_bg_color; border-color: $insensitive_borders_color; }
  }

  // ...on selected list rows
  row:selected & {
    &, &:disabled { border-color: $selected_borders_color; }
  }

  // OSD
  .osd & {
    border-color: $osd_borders_color;
    background-color: transparentize($osd_borders_color, 0.2);
    box-shadow: none;

    &:disabled { background-color: $insensitive_bg_color; }
  }
}

%scale_highlight {
  border: 2px solid $selected_borders_color;
  border-radius: 4px;
  background-color: $selected_bg_color;

  &:disabled {
    background-color: transparent;
    border-color: transparent;
  }

  &:backdrop {
    border-color: $backdrop_dark_fill;
    &:disabled {
      background-color: transparent;
      border-color: transparent;
    }
  }

  // ...on selected list rows
  row:selected & { &, &:disabled { border-color: $selected_borders_color; } }

  // OSD
  .osd & {
    border-color: $osd_borders_color;

    &:disabled { border-color: transparent; }
  }
}

scale {
  // sizing

  $_marks_length: 6px;
  $_marks_distance: 6px;

  min-height: 10px;
  min-width: 10px;
  padding: 12px;

  fill,
  highlight { margin: -1px; }

  slider {
    min-height: 18px;
    min-width: 18px;
    margin: -9px;
  }

  &.fine-tune {
    &.horizontal {
      padding-top: 9px;
      padding-bottom: 9px;
      min-height: 16px;
    }

    &.vertical {
      padding-left: 9px;
      padding-right: 9px;
      min-width: 16px;
    }

    slider { margin: -6px; }

    fill,
    highlight,
    trough {
      border-radius: 5px;
      -gtk-outline-radius: 7px;
    }
  }

  // the backing bit
  trough {
    @extend %scale_trough;

    outline-offset: 2px;
    -gtk-outline-radius: 5px;
  }

  // the colored part of the backing bit
  highlight { @extend %scale_highlight; }

  // this is another differently styled part of the backing bit, the most relevant use case is for example
  // in media player to indicate how much video stream as been cached
  fill {
    @extend %scale_trough;

    &, &:backdrop {
      background-color: $borders_color;
      box-shadow: none;
    }

    &:disabled {
      &, &:backdrop {
        border-color: transparent;
        background-color: transparent;
      }
    }

    // OSD
    .osd & {
      background-color: mix($osd_fg_color, $osd_borders_color, 25%);

      &:disabled {
        &, &:backdrop {
          border-color: transparent;
          background-color: transparent;
        }
      }
    }
  }

  slider {
    @include button(normal);

    border: 2px solid $borders_color;
    border-radius: 100%;

    &:hover { @include button(hover); }

    &:active { border-color: $selected_borders_color; }

    &:disabled { @include button (insensitive); }

    &:backdrop {
      @include button(backdrop);
      &:disabled { @include button(backdrop-insensitive); }
    }

    // ...on selected list rows
    row:selected & { &, &:disabled { border-color: $selected_borders_color; } }

    // OSD
    .osd & {
      @include button(osd);
      border-color: $osd_borders_color;
      background-color: opacify($osd_bg_color, 1); // solid background needed here

      &:hover { @include button(osd-hover); }

      &:active { @include button(osd-active); }

      &:disabled { @include button(osd-insensitive); }

      &:backdrop {
        @include button(osd-backdrop);

        &:disabled { @include button(osd-backdrop-insensitive); }
      }
    }
  }

  value { color: gtkalpha(currentColor, 0.4); }

  marks {
    color: gtkalpha(currentColor, 0.4);

    @each $marks_class, $marks_pos, $marks_margin in (top, top, bottom),
                                                     (bottom, bottom, top),
                                                     (top, left, right),
                                                     (bottom, right, left) {
      &.#{$marks_class} {
        margin-#{$marks_margin}: $_marks_distance;
        margin-#{$marks_pos}: -($_marks_distance + $_marks_length);
      }
    }
  }

  &.fine-tune marks {
    @each $marks_class, $marks_pos, $marks_margin in (top, top, bottom),
                                                     (bottom, bottom, top),
                                                     (top, left, right),
                                                     (bottom, right, left) {
      &.#{$marks_class} {
        margin-#{$marks_margin}: $_marks_distance;
        margin-#{$marks_pos}: -($_marks_distance + $_marks_length - 3px);
      }
    }
  }
  &.horizontal {
    indicator {
      min-height: $_marks_length;
      min-width: 1px;
    }

    &.fine-tune indicator { min-height: ($_marks_length - 3px); }
  }
  &.vertical {
    indicator {
      min-height: 1px;
      min-width: $_marks_length;
    }

    &.fine-tune indicator { min-width: ($_marks_length - 3px); }
  }
}


/*****************
 * Progress bars *
 *****************/

//FIXME it's a wip ok?

progressbar {
  padding: 0;
  font-size: 83%;
  color: $fg_color;

  &:backdrop {
    color: $insensitive_fg_color;
  }

  trough {
    border-width: 1px;
    border-style: solid;
    border-radius: 3px;
    border-color: $borders_color;
    background-color: mix($borders_color,$bg_color, 35%);
    box-shadow: inset 1px 1px transparentize(black, 0.9);
    &:backdrop {
      border-color: $backdrop_borders_color;
      background-color: mix($backdrop_borders_color,$backdrop_bg_color, 35%);
      box-shadow: 0 1px transparentize(white,1);
    }
  }
  &.osd trough {
    background-color: transparent;
    box-shadow: none;
    border-width: 0;
    //FIXME: there is a margin on top
  }
}

// moving bit
progressbar {
  &.horizontal {
    trough, progress { min-height: 2px; }
  }
  &.vertical {
    trough, progress { min-width: 2px; }
  }
  & progress {
    border-width: 1px;
    border-style: solid;
    border-radius: 3px;
    border-color: $selected_borders_color;
    background-color: $selected_bg_color;
    // I really prefer these flat w/o this shadow - Lapo
    box-shadow: inset 0 1px 0 transparentize($borders_edge,0.8);
    &.vertical {
      box-shadow: inset 1px 0 0 transparentize($borders_edge,0.8);
    }
    &:backdrop {
      border-color: $selected_bg_color;
      background-color: $selected_bg_color;
      box-shadow: none;
    }
    &.osd {
      border-width: 0;
      border-radius: 0;
    }
  }
  trough.empty progress { all: unset; } // make the progress indicator disappear when the fraction is 0
}

/*************
 * Level Bar *
 *************/

levelbar {
  & trough {
    // FIXME: outset not working
    padding: 2px;
    border-radius: 3px;
    @include entry(normal);
    &:backdrop {
      @include entry(backdrop);
    }
  }

  &.horizontal {
    block {
      min-height: 1px;
    }

    &.discrete block {
      margin: 0 1px;
      min-width: 32px;
    }
  }

  &.vertical {
    block {
      min-width: 1px;
    }

    &.discrete block {
      margin: 1px 0;
      min-height: 32px;
    }
  }

  & block.filled.low {
    border-color: darken($warning_color,10%);
    background-color: $warning_color;
    &:backdrop { border-color: $warning_color; };
  }
  & block.filled.high {
    border-width: 1px;
    border-style: solid;
    border-color: darken($selected_bg_color,10%);
    background-color: $selected_bg_color;
    box-shadow: 0 1px transparentize(black, 0.9);
    border-radius: 1px;
    &:backdrop {
      border-color: $selected_bg_color;
      box-shadow: none;
    }
  }
  & block.filled.full {
    border-color: darken($success_color,10%);
    background-color: $success_color;
    &:backdrop { border-color: $success_color; }
  }
  & block.empty {
    border-width: 1px;
    border-style: solid;
    background-color: transparent;
    border-color: transparentize($fg_color,0.8);
    border-radius: 1px;
    box-shadow: none;
    &:backdrop { border-color: transparentize($backdrop_fg_color,0.85); }
  }
}

// catch all extend :)

%selected_items {
  background-color: $selected_bg_color;
  color: $selected_fg_color;
  &:backdrop { background-color: $borders_color; color: $selected_fg_color; }
}

/**********
 * frames *
 **********/
frame,
.frame {
  border: 1px solid $borders_color;
  &.flat { border-style: none; }
  &:backdrop { border-color: $backdrop_borders_color; }
  padding: 0;
}

actionbar > revealer > box {
  padding: 6px;
  border-width: 1px 0 0;
  border-color: $borders_color;
  border-style: solid none none;
}

placessidebar,
scrolledwindow {
  .frame { border-radius: 2px; }
  viewport.frame { // avoid double borders when viewport inside scrolled window
    border-style: none;
  }
  // This is used when content is touch-dragged past boundaries.
  overshoot {
    &.top {
      @include overshoot(top);
      &:backdrop { @include overshoot(top, backdrop); }
    }
    &.bottom {
      @include overshoot(bottom);
      &:backdrop { @include overshoot(bottom, backdrop); }
    }
    &.left {
      @include overshoot(left);
      &:backdrop { @include overshoot(left, backdrop); }
    }
    &.right {
      @include overshoot(right);
      &:backdrop { @include overshoot(right, backdrop); }
    }
  }

  // works similarly to the overshoot, the size if fixed tho.
  undershoot {
    &.top {
      @include undershoot(top);
    }
    &.bottom {
      @include undershoot(bottom);
    }
    &.left {
      @include undershoot(left);
    }
    &.right {
      @include undershoot(right);
    }
  }

  junction { // the small square between two scrollbars
    border-color: transparent;
    background-color: darken($bg_color, 5%);
    &:backdrop { background-color: transparent; }
  }

}

//vbox and hbox separators
separator {
  background: $borders_color;
  min-width: 1px;
  min-height: 1px;
}

/*********
 * Lists *
 *********/

list {
  background-color: $base_color;
  border-color: $borders_color;
  &:backdrop {
    background-color: $backdrop_base_color;
    border-color: $backdrop_borders_color;
  }
  & row {
    padding: 2px;
  }
}

row.activatable,
row.activatable:backdrop,
row.activatable:backdrop:active,
row.activatable:backdrop:checked,
row.activatable:backdrop:disabled,
row.activatable:backdrop:disabled:active,
row.activatable:backdrop:disabled:checked,
row.activatable:disabled:active,
row.activatable:disabled:checked {
  // reset button inherited stuff
  @extend %undecorated_button;
  background-color: transparentize($base_color,1); // for the transition
  border-style: none; // I need no borders here
  border-radius: 0;   // and no rounded corners
  box-shadow: none;   // and no box-shadow
}

row {
  &.activatable {
    color: $fg_color;
    &:hover {
      background-color: mix($fg_color, $base_color, 5%);
    }
    &:active {
      box-shadow: inset 0 2px 2px -2px transparentize(black, 0.8);
    }
    &:selected {
      @extend %selected_items;
      background-color: $selected_bg_color;
      color: $selected_fg_color;
      &:active { box-shadow: inset 0 2px 3px -1px transparentize(black, 0.5); }
      &:hover {
        background-color: mix($fg_color, $selected_bg_color, 10%);
      }
      &:backdrop { background-color: $borders_color; }
      .button.flat { 
        color: $selected_fg_color;
        &:hover { color: $fg_color; }
        &:active { color: $selected_fg_color; }
      }
    }
  }
  .button.flat {
    color: $fg_color;
    &:active { color: $selected_fg_color; }
  }
}


// transition
row,
row.activatable {
  transition: all 300ms $ease-out-quad;
  &:hover { transition: none; }
}


/*********************
 * App Notifications *
 *********************/

.app-notification,
.app-notification.frame {
  padding: 10px;
  border-width: 0 1px 1px;
  border-style: solid;
  border-color: $borders_color;
  border-radius: 0 0 6px 6px;
  background-image: linear-gradient(to bottom, mix(black, $bg_color, 6%) 5%,
                              mix(black, $bg_color, 4%));
  // FIXME no space for outer shadow : box-shadow: 0 1px 1px rgba(0,0,0,.5);
  .button { padding: 6px; }
  border { border-width: 0; }
}

/*************
 * Expanders *
 *************/

expander {
  & arrow {
    min-width: 16px;
    min-height: 16px;
    -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
    &:dir(rtl) { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic-rtl'); }
    &:hover { color: lighten($fg_color,30%); } //only lightens the arrow
    &:checked { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }
  }
}

/************
 * Calendar *
 ***********/
calendar {
  border: 1px solid $borders_color;
  &:selected {
    @extend .view:selected;
  }
  &.button {
    @extend %undecorated_button;
    padding: 0 4px; //FIXME no effect on these pseudobuttons
    color: mix($fg_color, $base_color, 40%); //we need a dimmed stuff var
    &:hover {
      @extend %undecorated_button;
      color: $fg_color;
    }
    &:backdrop, &:backdrop:hover {
      @extend %undecorated_button;
      color: mix($backdrop_fg_color, $backdrop_base_color, 50%);
    }
  }
  &.view { border-radius: 2px; }
  &.header {
    background: linear-gradient(to bottom,
                                lighten($bg_color,2%),
                                darken($bg_color,2%));
    border-bottom-color: mix($borders_color,$bg_color,50%);
    &:backdrop {
      background-image: _solid($backdrop_bg_color);
      border-bottom-color: mix($backdrop_borders_color,$backdrop_bg_color,50%);
    }
  }

  &:indeterminate, &:indeterminate:backdrop { color: gtkalpha(currentColor, 0.55); }
  &.highlight, &.highlight:backdrop { color: $fg_color; }
}


/***********
 * Dialogs *
 ***********/

messagedialog .dialog-action-area button {
  padding: 8px;
}

messagedialog { // Message Dialog styling
  .titlebar {
    border-style: none;
    box-shadow: inset 0 1px $borders_edge;
  }

  &.csd { // rounded bottom border styling for csd version
    &.background {
      // bigger radius for better antialiasing
      border-bottom-left-radius: 9px;
      border-bottom-right-radius: 9px;
    }

    .dialog-action-area button {
      padding: 12px;
      border-radius: 0;

      @include button(normal, $edge: none);
      @extend %middle_button;

      &:hover {
        @include button(hover, $edge: none);
        @extend %middle_button;
      }

      &:active {
        @include button(active, $edge: none);
        @extend %middle_button;
      }

      &:disabled {
        @include button(insensitive, $edge: none);
        @extend %middle_button;
      }

      &:backdrop {
        @include button(backdrop, $edge: none);
        @extend %middle_button;
      }
      &:backdrop:disabled {
        @include button(backdrop-insensitive, $edge: none);
        @extend %middle_button;
      }

      @each $b_type, $b_color in (suggested-action, $suggested_color),
                                 (destructive-action, $destructive_color) {
        &.#{$b_type} {
          @include button(normal, $b_color, white, $edge: none);
          @extend %middle_button;

          &:hover {
            @include button(hover, $b_color, white, $edge: none);
            @extend %middle_button;
          }

          &:active {
            @include button(active, $b_color, white, $edge: none);
            @extend %middle_button;
          }

          &:backdrop {
            @include button(backdrop, $b_color, white);
            @extend %middle_button;

            &:disabled {
              @include button(backdrop-insensitive);
              @extend %middle_button;
            }
          }

          &:disabled {
            @include button(insensitive);
            @extend %middle_button;
          }
        }
      }

      &:first-child{ @extend %first_button; }
      &:last-child { @extend %last_button; }
    }

    %middle_button {
      border-right-style: none;
      border-bottom-style: none;
    }

    %last_button {
      border-bottom-right-radius: 7px;
      -gtk-outline-bottom-right-radius: 5px;
    }

    %first_button {
      border-left-style: none;
      border-bottom-left-radius: 7px;
      -gtk-outline-bottom-left-radius: 5px;
    }
  }
}

filechooser {
  .dialog-action-box {
    border-top: 1px solid $borders_color;

    &:backdrop { border-top-color: $backdrop_borders_color; }
  }

  #pathbarbox { border-bottom: 1px solid $bg_color; }
}

filechooserbutton:drop(active) {
  box-shadow: none;
  border-color: transparent;
}


/***********
 * Sidebar *
 ***********/

.sidebar {
  border: none;
  &:backdrop {
    background-color: $bg_color;
  }

  &:selected {
    @extend %selected_items;
  }

  & > scrolledwindow > .frame {
    border-right: 1px solid $borders_color;
    &:dir(rtl) {
      border-right: none;
      border-left: 1px solid $borders_color;
    }
  }
}

stacksidebar {
  & row {
    padding: 10px 4px;
    > label {
      padding-left: 6px;
      padding-right: 6px;
    }
    &.needs-attention > label {
      @extend %needs_attention;
      background-size: 6px 6px, 0 0;
    }
  }
}

/****************
 * File chooser *
 ****************/
$_placesidebar_icons_opacity: 0.7;

placessidebar {
  > viewport.frame { border-style: none; }

  row {
    // Needs overriding of the GtkListBoxRow padding
    min-height: 36px;
    padding: 0px;

    // Using margins/padding directly in the SidebarRow
    // will make the animation of the new bookmark row jump
    > revealer {
      padding: 0 14px;
    }

    & image.sidebar-icon {
      opacity: $_placesidebar_icons_opacity; // dim the device icons

      &:dir(ltr) { padding-right: 8px; }
      &:dir(rtl) { padding-left: 8px; }
    }

    & label.sidebar-label {
      &:dir(ltr) { padding-right: 2px; }
      &:dir(rtl) { padding-left: 2px; }
    }

    @at-root button.sidebar-button {
      @extend %button_basic.flat;

      @extend %button_selected.flat;

      min-height: 26px;
      min-width: 26px;
      margin-top: 3px;
      margin-bottom: 3px;
      padding: 0;
      border-radius: 100%;
      -gtk-outline-radius: 100%;

      &:not(:hover):not(:active),
      &:backdrop { > image { opacity: $_placesidebar_icons_opacity; }}
    }

    // in the sidebar case it makes no sense to click the selected row
    &:selected:active { box-shadow: none; }

    &.sidebar-placeholder-row {
      padding: 0 8px;
      min-height: 2px;
      background-image: _solid($fg_color);
      background-clip: content-box;
    }

    &.sidebar-new-bookmark-row { color: $selected_bg_color; }

    &:drop(active):not(:disabled) {
      color: $fg_color;
      box-shadow: inset 0 1px $fg_color,
                  inset 0 -1px $fg_color;

      &:selected {
        color: $selected_fg_color;
        background-color: $fg_color;
      }
    }
  }
}

placesview {
  .server-list-button > image {
    transition: 200ms $ease-out-quad;
    -gtk-icon-transform: rotate(0turn);
  }

  .server-list-button:checked > image {
    transition: 200ms $ease-out-quad;
    -gtk-icon-transform: rotate(-0.5turn);
  }

  row.activatable:hover { background-color: transparent; }
}


/*********
 * Paned *
 *********/


paned {
  separator {
    min-width: 1px;
    min-height: 1px;
    background-image: _solid($borders_color);
    &:backdrop {
      background-image: _solid($backdrop_borders_color);
    }
  }
   &:dir(ltr).horizontal separator {
    margin: 0 -8px 0 0;
    padding: 0 8px 0 0;
  }
  &:dir(rtl).horizontal separator {
    margin: 0 0 0 -8px;
    padding: 0 0 0 8px;
  }
  &.vertical separator {
    margin: 0 0 -8px 0;
    padding: 0 0 8px 0;
  }
  separator:selected {
    background-color: $selected_bg_color;
  }
  separator.wide {
    min-width: 5px;
    min-height: 5px;
    background-color: transparent;
    border-style: none solid;
    border-color: $borders_color;
    border-width: 1px;
  }
}

/**************
 * GtkInfoBar *
 **************/
infobar {
  border-width: 0;
  border-style: none;
}

.info,
.question,
.warning,
.error {
  background-color: $selected_bg_color;
  color: $selected_fg_color;
  text-shadow: 0 1px darken($selected_bg_color, 10%);
  border-color: darken($selected_bg_color, 10%);
  button {
    @include button(normal, $selected_bg_color, $selected_fg_color, $edge: none);
    &:hover { @include button(hover, $selected_bg_color, $selected_fg_color, $edge: none); }
    &:active { @include button(active, $selected_bg_color, $selected_fg_color, $edge: none); }
    &:disabled { @include button(insensitive, $selected_bg_color, $selected_fg_color, $edge: none); }
    &:backdrop { @include button(backdrop, $selected_bg_color, $selected_fg_color, $edge: none); }
    &:backdrop:disabled { @include button(backdrop-insensitive, $selected_bg_color, $selected_fg_color, $edge: none); }
  }
  label:selected,
  label:selected:focus,
  label:selected:hover {
    background-color: lighten($selected_bg_color, 20%);
  }
}

/************
 * Tooltips *
 ************/

tooltip {
  &.background {
    // background-color needs to be set this way otherwise it gets drawn twice
    // see https://bugzilla.gnome.org/show_bug.cgi?id=736155 for details.
    background-color: transparentize(black, 0.1);
    background-clip: padding-box;
    border: 1px solid $borders_color;
  }

  padding: 4px; /* not working */
  border-radius: 5px;
  box-shadow: none; // otherwise it gets inherited by windowframe.csd

  // FIXME: we need a border or tooltips vanish on black background.
  decoration { background-color: transparent; }

  * { // Yeah this is ugly
    padding: 4px;
    background-color: transparent;
    color: white;
  }
}


/*****************
 * Color Chooser *
 *****************/

colorswatch {
  // This widget is made of two boxes one on top of the other, the lower box is colorswatch {} the other one
  // is colorswatch overlay{}, GtkColorSwatch has the programmatically set background, so most of the style
  // is applied to the overlay box.

  $_colorswatch_shadow: inset 0 1px transparentize(black, 0.9), _widget_edge();

  box-shadow: $_colorswatch_shadow;

  // take care of colorswatches on selected elements
  :selected & {
    box-shadow: none;
    & overlay, & overlay:hover {
      border-color: $selected_fg_color;
    }
  }

  // we need to re-set the shadow here since it get axed by the previous bit
  &:selected { box-shadow: $_colorswatch_shadow; }

  // border rounding
  &.top {
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
  }
  &.bottom {
    border-bottom-left-radius: 6px;
    border-bottom-right-radius: 6px;
  }
  &.left, &:first-child:not(overlay):not(.top) {
    border-top-left-radius: 6px;
    border-bottom-left-radius: 6px;
  }
  &.right, &:last-child:not(overlay):not(.bottom) {
    border-top-right-radius: 6px;
    border-bottom-right-radius: 6px;
  }
  &:only-child:not(overlay) { border-radius: 6px; }

  // overlay corner rounding
  &.top > overlay {
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
  }
  &.bottom > overlay {
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
  }
  &:first-child:not(.top) > overlay {
    border-top-left-radius: 5px;
    border-bottom-left-radius: 5px;
  }
  &:last-child:not(.bottom) > overlay {
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
  }
  &:only-child > overlay { border-radius: 5px; }

  // nth-child is used for the custom colors row.
  // the :not() madness is needed since actually the overlay is selectable by GtkColorSwatch > .overlay
  // and GtkColorSwatch.overlay, I know it's weird, but this is gtk+.

  // hover effect
  &.activatable:hover,
  &.activatable:hover:selected {
    background-image: linear-gradient(135deg, transparentize(white, 0.3),
                                              transparentize(white, 1) 50%);
    box-shadow: inset 0 1px transparentize(white, 0.6),
                inset 0 -1px transparentize(black, 0.6);
  }
  &:backdrop,
  &:backdrop:selectedi,
  &.dark:backdrop,
  &.dark:backdrop:selected {
    background-image: none;
    box-shadow: none;
  }

  // indicator and keynav outline colors, color-dark is a color with luminosity lower then 50%
  &.dark {
    color: white;
    border: 1px solid transparentize(black, 0.7);
    &:hover { border-color: transparentize(black, 0.5); }
    &:backdrop { color: transparentize(white, 0.7); }
  }
  &.light {
    color: black;
    border: 1px solid transparentize(black, 0.7);
    &:hover { border-color: transparentize(black, 0.5); }
    &:backdrop { color: transparentize(black, 0.7); }
  }

  // border color
  & overlay,
  & overlay:selected {
    background: none;
    border: none;
  }

  // make the add color button looks like, well, a button
  &#add-color-button {
    @include button(normal);
    &:hover { @include button(hover); }
    &:backdrop { @include button(backdrop); }
    & overlay { border-width: 0; background: none; }
  }
}


/**********************
 * Window Decorations *
 *********************/

decoration {
  border-radius: 7px 7px 0 0;
  // lamefun trick to get rounded borders regardless of CSD use
  border-width: 0px;

  // this needs to be transparent
  // see bug #722563
  $_wm_border: transparentize($fg_color, 0.77);
  $_wm_border_backdrop: transparentize($fg_color, 0.82);

  box-shadow: 0 3px 9px 1px transparentize(black, 0.5),
              0 0 0 1px $_wm_border; //doing borders with box-shadow

  /* this is used for the resize cursor area */
  margin: 10px;

  &:backdrop {
    box-shadow: 0 2px 6px 2px transparentize(black, 0.8),
                0 3px 9px 1px transparent,
                0 0 0 1px $_wm_border_backdrop;
  }

  .tiled & {
    border-radius: 0;
  }

  .csd.popup & {
    border-radius: 0;
    box-shadow: 0 1px 2px transparentize(black, 0.8),
                0 0 0 1px transparentize($_wm_border,0.1);
  }

  tooltip.csd & {
    border-radius: 5px;
    box-shadow: none;
  }

  messagedialog.csd & {
    border-radius: 7px;
    box-shadow: 0 1px 2px transparentize(black, 0.8),
                0 0 0 1px transparentize($_wm_border, 0.1);
  }

  .solid-csd & {
    border-radius: 0;
    margin: 4px;
    background-color: $backdrop_bg_color;
    border: solid 1px $backdrop_borders_color;
    box-shadow: none;
  }
}

// Window Close button
button.titlebutton {
  @extend %button_basic;

  @extend %button_basic.flat;
}

/**********************
 * Touch Copy & Paste *
 *********************/

//touch selection handlebars for the Popover.osd above
cursor-handle {
  background-color: $bg_color;
  background-image: none;
  -gtk-icon-source: none;
  box-shadow: none;
  outline-style: none;
  outline-color: transparent;
  border: 2px solid $fg_color;
  @each $s,$as in ('',''),
                  (':hover','-hover'),
                  (':active','-active') { //no need for insensitive and backdrop
                    &.top#{$s}:dir(ltr), &.bottom#{$s}:dir(rtl) {
                      border-radius: 10px 0 0 0;
                      padding-left: 10px;
                    }
                    &.bottom#{$s}:dir(ltr), &.top#{$s}:dir(rtl) {
                      border-radius: 0 10px 0 0;
                      padding-right: 10px;
                    }
                    &.insertion-cursor#{$s}:dir(ltr), &.insertion-cursor#{$s}:dir(rtl) {
                      border-radius: 10px 10px 0 0;
                    }
  }
}

/* Decouple the font of context menus from their entry/textview */
.context-menu {
  font: initial;
}

.touch-selection {
  font: initial;
  color: $osd_fg_color;
  border: none;
  background-color: opacify($osd_bg_color,0.2);
  background-clip: padding-box;
  box-shadow: none;
  text-shadow: 0 1px black;
  -gtk-icon-shadow: 0 1px black;
  &:backdrop { text-shadow: none; }
  button {
    @include button(osd);
    &:hover { @include button(osd-hover); }
    &:active, &:checked { @include button(osd-active); }
    &:disabled, &:backdrop:disabled { @include button(osd-insensitive); }
    &:backdrop { @include button(osd-backdrop); }
  }
  // checkboxes and radios to use the -dark style for OSD style popovers
  @each $w,$a in ('check', 'checkbox'),
                 ('radio','radio') {
    @each $s,$as in ('','-unchecked'),
                  (':hover', '-unchecked-hover'),
                  (':active', '-unchecked-active'),
                  (':disabled','-unchecked-insensitive'),
                  (':indeterminate', '-mixed'),
                  (':indeterminate:hover', '-mixed-hover'),
                  (':indeterminate:selected', '-mixed-active'),
                  (':indeterminate:disabled', '-mixed-insensitive'),
                  (':checked', '-checked'),
                  (':checked:disabled','-checked-insensitive'),
                  (':checked:hover', '-checked-hover'),
                  (':checked:active', '-checked-active'),
                  (':backdrop:checked', '-checked-backdrop') {
    .#{$w}#{$s} {
      -gtk-icon-shadow: none;
      color: $osd_fg_color; 
      }
    }
  }
}

button.circular { // FIXME: aggregate to buttons
  border-radius: 20px;
  -gtk-outline-radius: 20px;

  label { padding: 0; }
  row:selected & { 
    color: $selected_fg_color; 
    &:hover { color: $fg_color; }
    &:active { color: $selected_fg_color; }
  }
}

// shortcut window keys
.keycap {
  min-width: 18px;
  min-height: 25px;
  margin-top: 3px;
  padding-bottom: 2px;
  padding-left: 6px;
  padding-right: 6px;

  color: $fg_color;
  background-color: $base_color;
  border: 2px solid;
  border-color: $borders_color;
  border-radius: 5px;
  box-shadow: inset 0 -3px mix($borders_color, $bg_color, 50%),
              inset 0 -2px $bg_color,
              inset 0 0 0 1px $base_color;
  font-size: smaller;
}

*:drop(active):focus,
*:drop(active) {
  border-color: $fg_color;
  box-shadow: inset 0 0 0 2px $fg_color;
}

stackswitcher button.text-button {
  min-width: 100px;
}

stackswitcher button.circular {
  min-width: 0px;
}


/*********
 * Emoji *
 ********/

popover.emoji-picker { padding-left: 0; padding-right: 0; }

button.emoji-section,
button.emoji-section:backdrop { /* Dodge stuff inherited from backdrop button */
  border-color: transparent;
  border-width: 3px;
  border-style: none none solid;
  border-radius: 0;

  margin: 2px 4px 2px 4px;
  padding: 3px 0 0;
  min-width: 32px;
  min-height: 28px;

  /* reset props inherited from the button style */
  background: none;
  box-shadow: none;
  text-shadow: none;

  outline-offset: -5px;

  &:backdrop:not(:checked) { border-color: transparent; }
  &:hover { border-color: $borders_color; }
  &:checked { border-color: $selected_bg_color; }

  label {
    padding: 0;

    opacity: 0.55;
  }

  &:hover label { opacity: 0.775; }

  &:checked label {
    opacity: 1;

    /* Dodge default inversion to white for non-flat, selected button */
    color: $fg_color;
  }
}

.emoji {
  font-size: x-large;
  padding: 6px;
  border-radius: 6px;

  :hover {
    background: $selected_bg_color;
    color: $selected_fg_color;
  }
}