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

$ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
$asset_suffix: if($variant=='dark', '-dark', ''); // use dark assets in dark variant
$darker_asset_suffix: if($darker=='true', '-dark', $asset_suffix);

* {
  background-clip: padding-box;
  -GtkToolButton-icon-spacing: 4;
  -GtkTextView-error-underline-color: $error_color;

  -GtkCheckButton-indicator-size: 16;
  -GtkCheckMenuItem-indicator-size: 16;

  -GtkScrolledWindow-scrollbar-spacing: 0;
  -GtkScrolledWindow-scrollbars-within-bevel: 1;

  -GtkToolItemGroup-expander-size: 11;
  -GtkExpander-expander-size: 16;
  -GtkTreeView-expander-size: 11;

  -GtkTreeView-horizontal-separator: 4;

  -GtkMenu-horizontal-padding: 0;
  -GtkMenu-vertical-padding: 0;

  -GtkWidget-link-color: $link_color;
  -GtkWidget-visited-link-color: $link_visited_color;

  -GtkWidget-focus-padding: 2;    // FIXME: do we still need these?
  -GtkWidget-focus-line-width: 1; //

  -GtkWidget-text-handle-width: 20;
  -GtkWidget-text-handle-height: 20;

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

  -GtkStatusbar-shadow-type: none;

  // We use the outline properties to signal the focus properties
  outline-color: transparentize($fg_color, 0.7);
  outline-style: dashed;
  outline-offset: -3px;
  outline-width: 1px;
  outline-radius: 2px;
}


//
// Base States
//
.background {
  color: $fg_color;
  background-color: if($transparency == 'true', transparentize($bg_color, 0.001), $bg_color); // without this headerbar transparency doesn't seem to work
}

*:insensitive {
  -gtk-image-effect: dim;
}

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

.view {
  color: $text_color;
  background-color: $base_color;

  &:selected,
  &:selected:focus,
  &:selected:hover {
    @extend %selected_items;
  }
  &.dim-label {
    color: transparentize($text_color, 0.45);

    &:selected, &:selected:focus {
      color: transparentize($selected_fg_color, 0.35);
      text-shadow: none;
    }
  }
}

.rubberband {
  border: 1px solid darken($selected_bg_color, 10%);
  background-color: transparentize(darken($selected_bg_color, 10%), 0.8);
}

.label {
  &.separator {
    color: $fg_color;
    @extend .dim-label;
  }
  &:selected,
  &:selected:focus,
  &:selected:hover {
    @extend %selected_items;
  }
  &:insensitive {
    color: $insensitive_fg_color;
  }
}

.dim-label {
  opacity: 0.55;
}

GtkAssistant {
  .sidebar {
    background-color: $base_color;
    border-top: 1px solid $borders_color;
    &:dir(ltr) { border-right: 1px solid $borders_color; }
    &:dir(rtl) { border-left: 1px solid $borders_color; }
  }
  &.csd .sidebar { border-top-style: none; }
  .sidebar .label {
    padding: 6px 12px;
  }
  .sidebar .label.highlight {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
  }
}

GtkTextView { // This will get overridden by .view, needed by gedit line numbers
  background-color: mix($bg_color, $base_color, 50%);
}

.grid-child {
  padding: 3px;
  border-radius: 3px;
  &:selected {
    @extend %selected_items;
    outline-offset: -2px;
  }
}

%osd, .osd {
  color: $osd_fg_color;
  border: none;
  background-color: $osd_bg_color;
  background-clip: padding-box;
  outline-color: transparentize($osd_fg_color, 0.7);
  box-shadow: none;
}

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

.spinner {
  background-image: none;
  background-color: blue;
  opacity: 0; // non spinning spinner makes no sense
  -gtk-icon-source: -gtk-icontheme('process-working-symbolic');

  &:active {
    opacity: 1;
    animation: spin 1s linear infinite;

    &:insensitive {
      opacity: 0.5;
    }
  }
}

$vert_padding: 5px;
//
// Text Entries
//
.entry {
  border: 1px solid;
  padding: $vert_padding 8px;

  border-radius: 3px;
  transition: all 200ms $ease-out-quad;
  @include entry(normal);

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

    &.left { padding-left: 0; }
    &.right { padding-right: 0; }
  }

  &.flat, &.flat:focus {
    padding: 2px;
    @include entry(normal);
    border: none;
    border-radius: 0;
  }

  &:focus {
    background-clip: border-box;
    @include entry(focus);
  }

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

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

  &.progressbar {
    margin: 2px 12px;
    border-radius: 0;
    border-width: 0 0 2px;
    border-color: $selected_bg_color;
    border-style: solid;
    background-image: none;
    background-color: transparent;
    box-shadow: none;
  }

  @each $e_type, $e_color, $e_fg_color in (warning, $warning_color, $warning_fg_color),
                                          (error, $error_color, $error_fg_color) {
    &.#{$e_type} {
      color: $selected_fg_color;
      border-color: if($variant=='light', $e_color, $entry_border);
      background-image: linear-gradient(to bottom, mix($e_color, $base_color, 60%));

      &:focus {
        color: $e_fg_color;
        background-image: linear-gradient(to bottom, $e_color);
        box-shadow: none;
      }
      &:selected, &:selected:focus {
        background-color: $e_fg_color;
        color: $e_color;
      }
    }
  }

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

  .linked:not(.vertical) > &,
  .linked:not(.vertical) > &:focus { @extend %linked; }

  .linked.vertical > &,
  .linked.vertical > &:focus { @extend %linked_vertical; }
}

GtkSearchEntry.entry { border-radius: 20px; }

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

@keyframes needs_attention {
  from {
    background-image: -gtk-gradient(radial,
                                    center center, 0,
                                    center center, 0.01,
                                    to($_dot_color),
                                    to(transparent));
  }
  to {
    background-image: -gtk-gradient(radial,
                                    center center, 0,
                                    center center, 0.5,
                                    to($selected_bg_color),
                                    to(transparent));
  }
}

.button {
  $_button_transition: all 200ms $ease-out-quad;

  transition: $_button_transition;
  border: 1px solid;
  border-radius: 3px;
  padding: $vert_padding 8px;

  @include button(normal);

  &.flat {
    @include button(undecorated);
    background-color: transparentize($button_bg, 1);
    border-color: transparentize($button_border, 1);
    // 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: 350ms;
      &:active { transition: $_button_transition; }
    }
  }
  &:hover {
    @include button(hover);
    -gtk-image-effect: highlight;
  }
  &:active, &:checked {
    background-clip: if($variant=='light', border-box, padding-box);
    @include button(active);
    transition-duration: 50ms;

    &:not(:insensitive) .label:insensitive { color: inherit; opacity: 0.6; }
  }

  //Webkitgtk workaround start
  &:active { color: $fg_color; }
  &:active:hover, &:checked { color: $selected_fg_color; }
  //Webkitgtk workaround end

  &.flat:insensitive {
    @include button(undecorated);
  }
  &:insensitive {
    @include button(insensitive);
    &:active, &:checked {
      @include button(insensitive-active);
    }
  }
  // big standalone buttons like in Documents pager
  &.osd {
    color: $osd_fg_color;
    outline-color: transparentize($osd_fg_color, 0.7);
    background-color: $osd_bg_color;
    border-color: darken($osd_bg_color, 8%);

    &.image-button { padding: 10px; }

    &:hover { color: $selected_bg_color; }
    &:active, &:checked { @include button(osd-active); }
    &:insensitive { @include button(osd-insensitive); }
  }

  //overlay / OSD style
  .osd & {
    @include button(osd);

    &:hover { @include button(osd-hover); }
    &:active, &:checked {
      background-clip: padding-box;
      @include button(osd-active);
    }
    &:insensitive { @include button(osd-insensitive); }

    &, &:hover, &:active, &:checked, &:insensitive { @extend %linked; }

    &.flat {
      @include button(undecorated);
      box-shadow: none;
      &:hover {
        @include button(osd-hover);
      }
      &:insensitive {
        @include button(osd-insensitive);
        background-image: none;
      }
      &:active, &:checked {
        @include button(osd-active);
      }
    }
  }
  .osd .linked:not(.vertical):not(.path-bar) > &:hover:not(:checked):not(:active):not(:only-child),
  .osd .linked:not(.vertical):not(.path-bar) > &:hover:not(:checked):not(:active) + &:not(:checked):not(:active) { box-shadow: none; }

  // Suggested and Destructive Action buttons
  @each $b_type, $b_color, $b_fg in (suggested-action, $suggested_color, $suggested_fg_color),
                                    (destructive-action, $destructive_color, $destructive_fg_color) {
    &.#{$b_type} {
      @include button(suggested_destructive, $b_color, $b_fg);

      &.flat {
        @include button(undecorated);
        color: $b_color;
        outline-color: transparentize($b_color, 0.7);
      }
      &:hover {
        @include button(suggested_destructive, lighten($b_color, 10%), $b_fg);
      }
      &:active, &:checked {
        @include button(suggested_destructive, darken($b_color, 10%), $b_fg);
      }
      &.flat:insensitive {
        @include button(undecorated);
        color: $insensitive_fg_color;
      }
      &:insensitive { @include button(insensitive); }
    }
  }

  &.image-button { padding: 2px + $vert_padding; }
  .header-bar &.image-button { padding: 2px + $vert_padding 10px; }

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

  &.text-button.image-button {
    // those buttons needs uneven horizontal padding, we want the icon side
    // to have the image-button padding, while the text side the text-button
    // one, so we're adding the missing padding to the label depending on
    // its position inside the button
    padding: $vert_padding 8px; // same as .button
    GtkLabel:first-child { padding-left: 8px; }
    GtkLabel:last-child { padding-right: 8px; }
  }

  .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 overridden by GtkRadioButton outline-offset

    > GtkLabel {
      padding-left: 6px;  // label padding
      padding-right: 6px; //
    }
    > GtkImage {
      padding-left: 6px;
      padding-right: 6px;
      padding-top: $vert_padding - 2px;
      padding-bottom: $vert_padding - 2px;
    }

    &.text-button { padding: $vert_padding 10px; }  // needed or it will get overridden

    &.image-button { padding: $vert_padding - 3px 4px; }

    &.needs-attention > .label,
    &.needs-attention > GtkImage { @extend %needs_attention; }
    &.needs-attention:active > .label,
    &.needs-attention:active > GtkImage,
    &.needs-attention:checked > .label,
    &.needs-attention:checked > GtkImage {
      animation: none;
      background-image: none;
    }
  }

  %needs_attention {
    animation: needs_attention 150ms ease-in;
    background-image: -gtk-gradient(radial,
                                    center center, 0,
                                    center center, 0.5,
                                    to($_dot_color),
                                    to(transparent));
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    @if $variant == 'light' { background-position: right 3px, right 4px; }
    @else { background-position: right 3px, right 2px; }
    &:dir(rtl) {
      @if $variant == 'light' { background-position: left 3px, left 4px; }
      @else { background-position: left 3px, left 2px; }
    }
  }

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

  .linked:not(.vertical) > &,
  .linked:not(.vertical) > &:hover,
  .linked:not(.vertical) > &:active,
  .linked:not(.vertical) > &:checked {
    @extend %linked;
  }

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

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

// More inline toolbar buttons
.inline-toolbar.toolbar GtkToolButton {
  & > .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; }
}

// Some crazy linking stuff
@mixin linking_rules($a:0.7, $var:$variant, $vert:'false', $entry_rules:'true', $button_rules:'true',
                     $e_border:$entry_border, $b_border:$button_border) {

  $_border: if($vert=='false', left, top);

  @if $entry_rules=='true' {
    > .entry + .entry { border-#{$_border}-color: transparentize($e_border, $a); }

    > .entry.error + .entry,
    > .entry + .entry.error { border-#{$_border}-color: if($var=='light', $error_color, transparentize($e_border, $a)); }

    > .entry.warning + .entry,
    > .entry + .entry.warning { border-#{$_border}-color: if($var=='light', $warning_color, transparentize($e_border, $a)); }

    > .entry.error + .entry.warning,
    > .entry.warning + .entry.error { border-#{$_border}-color: if($var=='light', mix($error_color, $warning_color, 50%), transparentize($e_border, $a));}

    @each $e_type, $e_color in ('',$selected_bg_color),
                               ('.warning', $warning_color),
                               ('.error', $error_color) {

      > .entry + .entry#{$e_type}:focus:not(:last-child),
      > .entry + .entry#{$e_type}:focus:last-child { border-#{$_border}-color: if($var=='light', $e_color, $e_border); }

      > .entry#{$e_type}:focus:not(:only-child) {
        + .entry, + .button,
        + GtkComboBox > .the-button-in-the-combobox,
        + GtkComboBoxText > .the-button-in-the-combobox { border-#{$_border}-color: if($var=='light', $e_color, $e_border); }
      }
    }
    > .button:active + .entry,
    > .button:checked + .entry { border-#{$_border}-color: if($var=='light', $selected_bg_color, $e_border); }
  }
  @if $button_rules=='true' {
    $_uncolored_button: '.button:not(:checked):not(:active):not(.suggested-action):not(.destructive-action)';

    > .button + .button { border-#{$_border}-style: none; }

    > #{$_uncolored_button}:hover:not(:only-child),
    > #{$_uncolored_button}:hover + #{$_uncolored_button} { box-shadow: inset if($vert=='false', 1px 0, 0 1px) $b_border; }

    > #{$_uncolored_button}:first-child:hover,
    > .button:active + #{$_uncolored_button}:hover,
    > .button:checked + #{$_uncolored_button}:hover,
    > .button.suggested-action + #{$_uncolored_button}:hover,
    > .button.destructive-action + #{$_uncolored_button}:hover,
    > .entry + #{$_uncolored_button}:hover:not(:only-child) { box-shadow: none; }
  }
}

// special case, because path-bars are bugged
@mixin pathbar_linking_rules($sep_color:if($variant=='light', transparentize($button_border, 0.6), transparentize($button_border, 0.5))) {

    > .button + .button { border-left-style: none; }

    > .button:hover:not(:checked):not(:active):not(:only-child) {

      &:hover {
        box-shadow: inset  1px 0 $sep_color,
                    inset -1px 0 $sep_color;
      }
      &:first-child:hover { box-shadow: inset -1px 0 $sep_color; }
      &:last-child:hover { box-shadow: inset 1px 0 $sep_color; }
    }
}

// Apply the rules defined above
.linked:not(.vertical) {
  &:not(.path-bar) { @include linking_rules(); }
  &.path-bar { @include pathbar_linking_rules(); }
}

.linked.vertical { @include linking_rules($vert:'true'); }

%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-radius: 0;
  border-bottom-style: none;
}

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

%undecorated_button {
  border-color: transparent;
  background-color: transparent;
  background-image: none;
  box-shadow: none;
}

// menu buttons
.menuitem.button.flat {
  transition: none;
  @extend %undecorated_button;
  outline-offset: -1px;
  border-radius: 2px;

  &:hover { background-color: if($variant=='light', mix($fg_color,$bg_color,5%), mix($fg_color,$bg_color,10%)); }
  &:active, &:selected {
    @extend %selected_items;
  }
  &:checked { color: $fg_color; }
}

//
// Links
//
*:link {
  color: $link_color;
  &:visited {
    color: $link_visited_color;
    *:selected & { color: mix($selected_fg_color, $selected_bg_color, 60%); }
  }
  &:hover {
    color: lighten($link_color,10%);
    *:selected & { color: mix($selected_fg_color, $selected_bg_color, 90%); }
  }
  &:active {
    color: $link_color;
    *:selected & { color: mix($selected_fg_color, $selected_bg_color, 80%); }
  }
  &:selected, *:selected & {
    color: mix($selected_fg_color, $selected_bg_color, 80%);
  }
}

.button:link, .button:visited {
  @extend %undecorated_button;
  @extend *:link;
  &:hover, &:active, &:checked {
    @extend %undecorated_button;
  }
  > .label { text-decoration-line: underline; }
}

//
// Spinbuttons
//
.spinbutton {
  border-radius: 3px;

  .button {
    background-image: none;
    border: 1px solid transparentize($borders_color,0.4);
    border-style: none none none solid;
    color: mix($fg_color,$base_color,95%);
    border-radius: 0;
    box-shadow: none;

    &:dir(rtl) { border-style: none solid none none; }
    &:first-child { color: red; }

    &:insensitive {
      color: $insensitive_fg_color;
    }
    &:active {
      background-color: $selected_bg_color;
      color: $selected_fg_color;
    }
  }

//  .osd & {
//    .button {
//      @include button(undecorated);
//      color: $osd_fg_color;
//      border-style: none none none solid;
//      border-color: transparentize($osd_borders_color, 0.3);
//      border-radius: 0;
//      box-shadow: none;
//      &:dir(rtl) { border-style: none solid none none; }
//      &:hover {
//        @include button(undecorated);
//        color: $osd_fg_color;
//        border-color: transparentize(opacify($osd_borders_color, 1), 0.5);
//        background-color: transparentize($osd_fg_color, 0.9);
//        box-shadow: none;
//      }
//      &:insensitive {
//        @include button(undecorated);
//        color: $osd_insensitive_fg_color;
//        border-color: transparentize(opacify($osd_borders_color, 1), 0.5);
//        box-shadow: none;
//      }
//      &:last-child { border-radius: 0 2px 2px 0; }
//      &:dir(rtl):first-child { border-radius: 2px 0 0 2px; }
//    }
//  }

  &.vertical, &.vertical:dir(rtl) {
    .button {
      &:first-child {
        @extend %top_button;
        @include button(normal);
        &:active {
          @extend %top_button;
          @include button(active);
        }
        &:hover {
          @extend %top_button;
          @include button(hover);
        }
        &:insensitive {
          @extend %top_button;
          @include button(insensitive);
        }
      }
      &:last-child {
        @extend %bottom_button;
        @include button(normal);
        &:active {
          @extend %bottom_button;
          @include button(active);
        }
        &:hover {
          @extend %bottom_button;
          @include button(hover);
        }
        &:insensitive {
          @extend %bottom_button;
          @include button(insensitive);
        }
      }
    }
    &.entry {
      border-radius: 0;
      padding-left: 5px;
      padding-right: 5px;
    }
    %top_button {
      border-radius: 2px 2px 0 0;
      border-style: solid solid none solid;
    }
    %bottom_button {
      border-radius: 0 0 2px 2px;
      border-style: none solid solid solid;
    }
  }
  GtkTreeView & {
    &.entry, &.entry:focus {
      padding: 1px;
      border-width: 1px 0;
      border-color: $selected_bg_color;
      border-radius: 0;
      box-shadow: none;
    }
  }
}

//
// Comboboxes
//
GtkComboBox {
  -GtkComboBox-arrow-scaling: 0.5;
  -GtkComboBox-shadow-type: none;

  > .the-button-in-the-combobox {                   // Otherwise combos
    padding-top: $vert_padding - 2px;               // are bigger than
    padding-bottom: $vert_padding - 2px;            // buttons
  }

  &:insensitive {
    color: $insensitive_fg_color;
  }
  .separator.vertical { -GtkWidget-wide-separators: true; }

  &.combobox-entry .entry {
    &:dir(ltr) {
      border-top-right-radius: 0;
      border-bottom-right-radius: 0;
      border-right-style: none;

      @if $variant=='light' { &:focus { box-shadow: 1px 0 $selected_bg_color; } }
    }
    &:dir(rtl) {
      border-top-left-radius: 0;
      border-bottom-left-radius: 0;
      border-left-style: none;

      @if $variant=='light' { &:focus { box-shadow: -1px 0 $selected_bg_color; } }
    }
  }
  &.combobox-entry .button {
    &:dir(ltr) {
      border-top-left-radius: 0;
      border-bottom-left-radius: 0;
    }
    &:dir(rtl) {
      border-top-right-radius: 0;
      border-bottom-right-radius: 0;
    }
  }
}

.linked > GtkComboBox > .the-button-in-the-combobox,
.linked > GtkComboBoxText > .the-button-in-the-combobox {
  // the combo is a composite widget so the way we do button linkind 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 > GtkComboBox:first-child > .the-button-in-the-combobox,
.linked > GtkComboBoxText:first-child > .the-button-in-the-combobox {
  @extend %linked:first-child;
}
.linked > GtkComboBox:last-child > .the-button-in-the-combobox,
.linked > GtkComboBoxText:last-child > .the-button-in-the-combobox {
  @extend %linked:last-child;
}
.linked > GtkComboBox:only-child > .the-button-in-the-combobox,
.linked > GtkComboBoxText:only-child > .the-button-in-the-combobox {
  @extend %linked:only-child;
}

.linked.vertical > GtkComboBoxText > .the-button-in-the-combobox,
.linked.vertical > GtkComboBox > .the-button-in-the-combobox { @extend %linked_vertical_middle; }
.linked.vertical > GtkComboBoxText:first-child > .the-button-in-the-combobox,
.linked.vertical > GtkComboBox:first-child > .the-button-in-the-combobox { @extend %linked_vertical:first-child; }
.linked.vertical > GtkComboBoxText:last-child > .the-button-in-the-combobox,
.linked.vertical > GtkComboBox:last-child > .the-button-in-the-combobox { @extend %linked_vertical:last-child; }
.linked.vertical > GtkComboBoxText:only-child > .the-button-in-the-combobox,
.linked.vertical > GtkComboBox:only-child > .the-button-in-the-combobox { @extend %linked_vertical:only-child; }

//
// Toolbars
//
.toolbar {
  -GtkWidget-window-dragging: true;
  padding: 4px;
  background-color: $bg_color;
  .osd &, &.osd {
    padding: 7px;
    border: 1px solid transparentize(black, 0.5);
    border-radius: 3px;
    background-color: transparentize($osd_bg_color, 0.1);
  }
}

.primary-toolbar {
  color: $header_fg;
  background-color: opacify($header_bg, 1);
  box-shadow: none;
  border-width: 0 0 1px 0;
  border-style: solid;
  border-image: linear-gradient(to bottom, opacify($header_bg, 1),
                                           darken($header_bg, 7%)) 1 0 1 0; //temporary hack for rhythmbox 3.1

  //&:backdrop { background-color: opacify($header_bg_backdrop, 1); }

  .separator { @extend %header_separator; }

  @extend %header_widgets;
}

.inline-toolbar {
  @extend .toolbar;
  background-color: darken($bg_color, 3%);
  border-style: solid;
  border-color: $borders_color;
  border-width: 0 1px 1px;
  padding: 3px;
  border-radius: 0  0 3px 3px;
}

.search-bar {
  background-color: $bg_color;
  border-style: solid;
  border-color: $borders_color;
  border-width: 0 0 1px;
  padding: 3px;
  //box-shadow: inset 0 1px 2px rgba(0,0,0,0.25);
}

.action-bar { background-color: darken($bg_color, 3%) }

//
// Headerbars
//
.header-bar {
  padding: 5px 5px 4px 5px;

  border-width: 0 0 1px;
  border-style: solid;
  border-radius: 0;
  border-color: opacify($header_border, 1);

  color: $header_fg;
  background-color: opacify($header_bg, 1);

  .csd & {  // Transparent header-bars only in csd windows
    background-color: $header_bg;
    border-color: $header_border;
  }

  &:backdrop { color: transparentize($header_fg, 0.3); }

  .title {
    padding-left: 12px;
    padding-right: 12px;
  }

  .subtitle {
    font-size: smaller;
    padding-left: 12px;
    padding-right: 12px;
    @extend .dim-label;
  }

  // Selectionmode
  &.selection-mode,
  &.titlebar.selection-mode {
    color: $selection_mode_fg;
    background-color: $selection_mode_bg;
    border-color: darken($selection_mode_bg, 4%);
    box-shadow: none;

    &:backdrop {
      background-color: $selection_mode_bg;
      color: transparentize($selection_mode_fg, 0.4);
    }

    .subtitle:link { @extend *:link:selected;  }

    .button {
      color: $selected_fg_color;
      outline-color: transparentize($selected_fg_color, 0.7);
      background-color: transparentize($selected_fg_color, 1);
      border-color: transparentize($selected_fg_color, 1);

      &.flat {
        @include button(undecorated);
        color: $selected_fg_color;
        background-color: transparentize($selected_fg_color, 1);
      }
      &:hover {
        color: $selected_fg_color;
        outline-color: transparentize($selected_fg_color, 0.7);
        background-color: transparentize($selected_fg_color, 0.95);
        border-color: transparentize($selected_fg_color, 0.5);
      }
      &:active, &:checked {
        color: $selection_mode_bg;
        outline-color: transparentize($selection_mode_bg, 0.7);
        background-color: $selected_fg_color;
        border-color: $selected_fg_color;
      }
      &:insensitive {
        color: transparentize($selected_fg_color, 0.6);
        background-color: transparentize($selected_fg_color, 1);
        border-color: transparentize($selected_fg_color, 1);

        &:active, &:checked {
          color: transparentize($selection_mode_bg, 0.6);
          background-color: transparentize($selected_fg_color, 0.85);
          border-color: transparentize($selected_fg_color, 0.85);
        }
      }
    }

    .selection-menu {
      box-shadow: none;
      padding-left: 10px;
      padding-right: 10px;
      GtkArrow { -GtkArrow-arrow-scaling: 1; }
      .arrow {
        -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
      }
    }
    .maximized & { background-color: opacify($selection_mode_bg, 1); }
  }

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

  .maximized & {
    background-color: opacify($header_bg, 1);
    border-color: opacify($header_border, 1);
  }

  &.default-decoration,
  .csd &.default-decoration,             // needed under wayland, since all gtk3 windows are csd windows
  &.default-decoration:backdrop,
  .csd &.default-decoration:backdrop {
    padding-top: 5px;
    padding-bottom: 5px;
    background-color: opacify($header_bg, 1);
    border-bottom-width: 0;

    .maximized & { background-color: opacify($header_bg, 1); }
  }
}

.titlebar {
  padding-left: 7px;
  padding-right: 7px;
  border-radius: if($darker=='false' and $variant=='light', 4px 4px 0 0, 3px 3px 0 0);
  color: $header_fg;
  background-color: opacify($header_bg, 1);
  box-shadow: inset 0  1px lighten($header_bg, 3%);

  .csd & { background-color: $header_bg; }

  &:backdrop {
    color: transparentize($header_fg, 0.3);
    background-color: opacify($header_bg_backdrop, 1);

    .csd & { background-color: $header_bg_backdrop; }
  }

  .maximized & {
    background-color: opacify($header_bg, 1);

    &:backdrop, .csd &:backdrop { background-color: opacify($header_bg_backdrop, 1); }
  }
}

.titlebar .titlebar,
.titlebar .titlebar:backdrop { background-color: transparent; }

// Only extending .header-bar avoids some problems (Gnome Documents searchbar)
.header-bar {
  .header-bar-separator,
  & > GtkBox > .separator.vertical { @extend %header_separator; }

  @extend %header_widgets;
}

.csd headerbar headerbar,
.csd headerbar headerbar:backdrop {
  background-color: transparent;
}

%header_separator {
  -GtkWidget-wide-separators: true;
  -GtkWidget-separator-width: 1px;
  border-width: 0 1px;
  border-image: linear-gradient(to bottom,
                                transparentize($header_fg, 1) 25%,
                                transparentize($header_fg, 0.65) 25%,
                                transparentize($header_fg, 0.65) 75%,
                                transparentize($header_fg, 1) 75%) 0 1/0 1px stretch;

  &:backdrop { opacity: 0.6; }
}

%header_widgets {
  // Headerbar Entries
  .entry {
    @include entry(header-normal);

    &:backdrop { opacity: 0.85; }

    &:focus {
      @include entry(header-focus);
      background-clip: if($darker=='false' and $variant=='light', border-box, padding-box);

      &.image { color: $selected_fg_color; }
    }
    &:insensitive { @include entry(header-insensitive); }

    &:selected:focus {
      background-color: $selected_fg_color;
      color: $selected_bg_color;
    }

    &.progressbar {
      border-color: $selected_bg_color;
      background-image: none;
      background-color: transparent;
    }

    @each $e_type, $e_color, $e_fg_color in (warning, $warning_color, $warning_fg_color),
                                            (error, $error_color, $error_fg_color) {
      &.#{$e_type} {
        color: $e_fg_color;
        border-color: if($darker=='false' and $variant=='light', $e_color, $header_entry_border);
        background-image: linear-gradient(to bottom, mix($e_color, $header_bg, 60%));

        &:focus {
          color: $e_fg_color;
          background-image: linear-gradient(to bottom, $e_color);
        }
        &:selected, &:selected:focus {
          background-color: $e_fg_color;
          color: $e_color;
        }
      }
    }
  }

  // Headerbar Buttons
  .button {

    @include button(header-normal);

    &:backdrop { opacity: 0.7; }

    &:hover { @include button(header-hover); }
    &:active, &:checked {
      @include button(header-active);
      background-clip: if($darker=='false' and $variant=='light', border-box, padding-box);
    }
    &:insensitive { @include button(header-insensitive); }
    &:insensitive:active, &:insensitive:checked { @include button(header-insensitive-active); }
  }

  // Linking stuff

  // Reset buttons
  .linked:not(.vertical):not(.path-bar) > .button {
    &, &:hover, &:active, &:checked, &:insensitive {
      border-radius: 3px;
      border-style: solid;
    }
  }
  .linked:not(.vertical):not(.path-bar) {
    $_uncolored_button: '.button:not(:checked):not(:active):not(.suggested-action):not(.destructive-action)';

    > #{$_uncolored_button}:hover:not(:only-child),
    > #{$_uncolored_button}:hover + #{$_uncolored_button} { box-shadow: none; }
  }

  // special case for path-bars and stack-switchers
  .linked:not(.vertical):not(.path-bar).stack-switcher,
  .linked:not(.vertical).path-bar {

    > .button {
      @include button(header-hover);

      &:hover { background-color: lighten($header_button_bg, 15%); }
      &:active, &:checked { @include button(header-active); }
      &:insensitive { color: transparentize($header_fg, 0.4); }

      &, &:hover, &:active, &:checked, &:insensitive { @extend %linked; }
    }

    @include pathbar_linking_rules($sep_color:$header_button_border);
  }
  // use linking rules for entries only
  .linked:not(.vertical):not(.path-bar) {
    @include linking_rules( $a:0.5,
                            $var:if($variant=='light' and $darker=='false', 'light', 'dark'),
                            $button_rules:'false',
                            $e_border:$header_entry_border,
                            $b_border:$header_button_border );
  }

  // Headerbar Suggested and Destructive Action buttons
  @each $b_type, $b_color, $b_fg in (suggested-action, $suggested_color, $suggested_fg_color),
                                    (destructive-action, $destructive_color, $destructive_fg_color) {
    .button.#{$b_type} {
      @include button(suggested_destructive, $b_color, $b_fg);

      &.flat {
        @include button(undecorated);
        color: $b_color;
        outline-color: transparentize($b_color, 0.7);
      }
      &:hover {
        @include button(suggested_destructive, lighten($b_color, 10%), $b_fg);
      }
      &:active, &:checked {
        @include button(suggested_destructive, darken($b_color, 10%), $b_fg);
      }
      &.flat:insensitive,
      &:insensitive { @include button(header-insensitive); }
    }
    .button.#{$b_type}:backdrop,
    .button.#{$b_type}:backdrop {
      opacity: 0.8;
    }
  }

  // Headerbar Spinbuttons
  & .spinbutton {

    &:focus .button {
      color: $selected_fg_color;

      &:hover { background-color: transparentize($selected_fg_color, 0.9); border-color: transparent; }
      &:insensitive { color: transparentize($selected_fg_color, 0.6); }
    }
    .button {
      color: $header_fg;

      &:hover { background-color: transparentize($header_fg, 0.75); border-color: transparent; }
      &:insensitive { color: transparentize($header_fg, 0.3); }
      &:active { background-color: rgba(0,0,0,0.1); }
    }
  }

  // Headerbar ComboBoxes
  & GtkComboBox{
    &:insensitive { color: transparentize($header_fg, 0.6); }

    &.combobox-entry .button {
      @include entry(header-normal);

      &:hover { @include entry(header-focus); box-shadow: none; }
      &:insensitive { @include entry(header-insensitive); }
    }
    &.combobox-entry .entry {
      &:dir(ltr) {
        border-right-style: none;

        &:focus { box-shadow: none; }
        @if $variant=='light' and $darker=='false' { &:focus { box-shadow: 1px 0 $selected_bg_color; } }
      }
      &:dir(rtl) {
        border-left-style: none;

        &:focus { box-shadow: none; }
        @if $variant=='light' and $darker=='false' { &:focus { box-shadow: -1px 0 $selected_bg_color; } }
      }
    }

  }

  // Headerbar Switches
  GtkSwitch {
    &:backdrop { opacity: 0.75; }
  }

  GtkProgressBar {

    &.trough { background-color: if($variant=='light' and $darker=='false', opacify($header_button_border, 0.05), $header_button_border); }

    &:backdrop { opacity: 0.75; }
  }

  // Headerbar Scale
  .scale {

    &:backdrop { opacity: 0.75; }

    &.trough {
      $_trough_bg: if($variant=='light' and $darker=='false', opacify($header_button_border, 0.05), $header_button_border);
      background-image: linear-gradient(to bottom, $_trough_bg);

      &:insensitive { background-image: linear-gradient(to bottom, if($variant=='light' and $darker=='false', transparentize($_trough_bg, 0.05), transparentize($_trough_bg, 0.1))); }
    }
    &.slider {
      $_slider_border: if($variant=='light' and $darker=='false', opacify($header_button_border, 0.2), opacify($header_button_border, 0.3));
      $_slider_bg: if($variant=='light' and $darker=='false', opacify($header_button_bg,1), lighten(opacify($header_bg,1), 10%));

      background-image: linear-gradient(to bottom, $_slider_bg);
      border-color: $_slider_border;

      &:hover {
        background-image: linear-gradient(to bottom, lighten($_slider_bg, 5%));
        border-color: $_slider_border;
      }
      &:active {
        background-image: linear-gradient(to bottom, $selected_bg_color);
        border-color: $selected_bg_color;
      }
      &:insensitive {
        background-image: linear-gradient(to bottom, mix($_slider_bg, $header_bg, 70%));
        border-color: $_slider_border;
      }
    }
  }
}

//
// Pathbars
//
.path-bar .button {
  padding: 5px 10px;

  &:first-child { padding-left: 10px; }
  &:last-child { padding-right: 10px; }
  &:only-child {
    padding-left: 14px;
    padding-right: 14px;
  }

  // the following is for spacing the icon and the label inside the home button
  GtkLabel:last-child { padding-left: 4px; }
  GtkLabel:first-child { padding-right: 4px; }
  GtkLabel:only-child, GtkLabel { padding-right: 0; padding-left: 0; }
  GtkImage { padding-top: 2px; padding-bottom: 1px; }
}

//
// Tree Views
//
GtkTreeView.view {                                      // treeview grid lines and expanders, unfortunatelly
                                                        // the tree lines color can't be set
  -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: transparentize($fg_color, 0.85);   // this is actually the tree lines color,
  border-top-color: transparentize(black, 0.9);         // 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;
    border-left-color: mix($selected_fg_color, $selected_bg_color, 50%);
    border-top-color: transparentize($fg_color, 0.9);   // doesn't work unfortunatelly
  }

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

  &.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, 50%);

    &:hover { color: $fg_color; }

    &:selected {
      color: mix($selected_fg_color, $selected_bg_color, 70%);
      &:hover { color: $selected_fg_color; }
    }

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

  &.progressbar, &.progressbar:focus { // progress bar in treeviews
    color: $selected_fg_color;
    border-radius: 3px;
    background-image: linear-gradient(to bottom, $selected_bg_color);

    &:selected, &:selected:focus {
      color: $selected_bg_color;
      box-shadow: none;
      background-image: linear-gradient(to bottom, $selected_fg_color);
    }
  }
  &.trough { // progress bar trough in treeviews
    color: $fg_color;
    background-image: linear-gradient(to bottom, $button_border);
    border-radius: 3px;
    border-width: 0;

    &:selected, &:selected:focus {
      color: $selected_fg_color;
      background-image: linear-gradient(to bottom, transparentize(black, 0.8));
      border-radius: 3px;
      border-width: 0;
    }
  }
}

column-header {
  .button {
    @extend %column_header_button;
    $_column_header_color: mix($fg_color,$base_color,80%);
    color: $_column_header_color;
    background-color: $base_color;
    &:hover {
      @extend %column_header_button;
      color: $selected_bg_color;
      box-shadow: none;
      transition: none; //I shouldn't need this
    }
    &:active {
      @extend %column_header_button;
      color: $fg_color;
      transition: none; //I shouldn't need this
    }
    &.dnd {
      @extend column-header.button.dnd;
    }
  }
  &:last-child .button,
  &:last-child.button { //treeview-like derived widgets in Banshee and Evolution
    border-right-style: none;
    border-image: none;
  }
}

column-header.button.dnd { // for treeview-like derive widgets
  transition: none;
  color: $selected_bg_color;
  box-shadow: inset 1px 1px 0 1px $selected_bg_color,
              inset -1px 0 0 1px $selected_bg_color,
              inset 1px 1px $base_color, inset -1px 0 $base_color;;
  &:active { @extend column-header.button.dnd; }
  &:selected { @extend column-header.button.dnd; }
  &:hover { @extend column-header.button.dnd; }
}

%column_header_button {
  padding: 3px 6px;
  background-image: none;
  border-style: none solid none none;
  border-radius: 0;
  border-image: linear-gradient(to bottom,
                                transparentize(if($variant == 'light', black, white), 1) 20%,
                                transparentize(if($variant == 'light', black, white), 0.89) 20%,
                                transparentize(if($variant == 'light', black, white), 0.89) 80%,
                                transparentize(if($variant == 'light', black, white), 1) 80%) 0 1 0 0 / 0 1px 0 0 stretch;

  &:active, &:hover { background-color: $base_color; }
  &:active:hover { color: $fg_color; }
  &:insensitive {
    border-color: $bg_color;
    background-image: none;
  }
}

//
// Menus
//
.menubar {
  -GtkWidget-window-dragging: true;
  padding: 0px;
  background-color: opacify($header_bg, 1);
  color: $header_fg;

  &:backdrop {
    color: transparentize($header_fg, 0.3);
    //background-color: opacify($header_bg_backdrop, 1);
  }

  & > .menuitem {
    padding: 4px 8px;
    border: solid transparent;
    border-width: 0;

    &:hover { //Seems like it :hover even with keyboard focus
      background-color: $selected_bg_color;
      color: $selected_fg_color;
    }
    &:insensitive {
      color: transparentize($header_fg, 0.6);
      border-color: transparent;
    }
  }
}

.menu {
  margin: 4px;
  padding: 0;
  border-radius: 0;
  background-color: if($variant=='light', $base_color, $bg_color);
  border: 1px solid $borders_color;

  .csd & {
    padding: 4px 0px;
    border-radius: 2px;
    border: none;
  }

  .menuitem {
    padding: 5px;
    &:hover {
      color: $selected_fg_color;
      background-color: $selected_bg_color;
    }
    &:insensitive {
      color: $insensitive_fg_color;
    }

    &.separator { color: transparentize($base_color, 1); }

    //submenu indicators
    &.arrow { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic'); }
    &.arrow:dir(rtl) {-gtk-icon-source:-gtk-icontheme('pan-end-symbolic-rtl'); }
  }
  &.button { // overlow buttons
    @extend %undecorated_button;
    border-style: none;
    border-radius: 0;
    &.top { border-bottom: 1px solid mix($fg_color, $base_color, 10%); }
    &.bottom { border-top: 1px solid mix($fg_color, $base_color, 10%); }
    &:hover { background-color: mix($fg_color, $base_color, 10%); }
    &:insensitive {
      color: transparent;
      background-color: transparent;
      border-color: transparent ;
    }
  }
}

.csd .popup { border-radius: 2px; }

.menuitem .accelerator { color: gtkalpha(currentColor,0.55); }

//
// Popovers
//
.popover {
  padding: 2px;
  border: 1px solid darken($borders_color, 5%);
  border-radius: 3px;
  background-clip: border-box;
  background-color: if($variant=='light', $base_color, $bg_color);

  box-shadow: 0 2px 6px 1px if($variant=='light', transparentize(black, 0.93), transparentize(black, 0.65));

  & .separator { color: transparentize($base_color, 1); }
  .label.separator { @extend .label.separator; } // Noice

  > .list,
  > .view,
  > .toolbar,
  &.osd > .toolbar {
    border-style: none;
    background-color: transparent;
  }
  &.osd { @extend %osd; }
}

//touch selection handlebars for the Popover.osd above
.entry.cursor-handle,
.cursor-handle {
  background-color: transparent;
  background-image: none;
  box-shadow: none;
  border-style: none;
  &.top { -gtk-icon-source: -gtk-icontheme('selection-start-symbolic'); }
  &.bottom { -gtk-icon-source: -gtk-icontheme('selection-end-symbolic'); }
}

//
// Notebooks and Tabs
//
.notebook {
  padding: 0;
  background-color: $base_color;
  -GtkNotebook-initial-gap: 4;
  -GtkNotebook-arrow-spacing: 5;
  -GtkNotebook-tab-curvature: 0;
  -GtkNotebook-tab-overlap: 1;
  -GtkNotebook-has-tab-gap: false;
  -GtkWidget-focus-padding: 0;
  -GtkWidget-focus-line-width: 0;
  transition: all 200ms $ease-out-quad;

  &.frame {
    border: 1px solid $borders_color;

    &.top { border-top-width: 0; }
    &.bottom { border-bottom-width: 0; }
    &.right { border-right-width: 0; }
    &.left { border-left-width: 0; }
  }
  &.header {
    background-color: $bg_color;

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

    $_header_border: $borders_color;
    &.top {    box-shadow: inset  0   -1px $_header_border; }
    &.bottom { box-shadow: inset  0    1px $_header_border; }
    &.right {  box-shadow: inset  1px  0   $_header_border; }
    &.left {   box-shadow: inset -1px  0   $_header_border; }
  }
  tab {
    border-width: 0;
    border-style: solid;
    border-color: transparent;
    background-color: transparent;
    outline-color: transparent;

    outline-offset: 0;

    // tab sizing
    $vpadding: 4px;
    $hpadding: 15px;

    //FIXME: we get double border in some cases, not considering the broken
    //notebook content frame...
    &.top, &.bottom { padding: $vpadding $hpadding; }
    &.left, &.right { padding: $vpadding $hpadding; }

    &.reorderable-page {
      &.top, &.bottom {
        padding-left: 12px;  // for a nicer close button
        padding-right: 12px; // placement
      }
    }
    @each $_tab in (top, bottom, right, left) {
      &.reorderable-page.#{$_tab}, &.#{$_tab} {

        @if $_tab==top or $_tab==bottom {
          padding-#{$_tab}: $vpadding + 2;
        }
        @else if $_tab==left or $_tab==right {
          padding-#{$_tab}: $hpadding + 2;
        }

        @if $_tab==top { border-radius: 3.5px 2px 0 0; }
        @else if $_tab==bottom { border-radius: 0 0 2px 3.5px; }
        @else if $_tab==left { border-radius: 3.5px 0 0 3.5px; }
        @else if $_tab==right { border-radius: 0 3.5px 3.5px 0; }

        border-width: 0;
        border-#{$_tab}-width: 2px;
        border-color: transparent;
        background-color: transparentize($base_color, 1);

        &:hover, &.prelight-page {
          background-color: transparentize($base_color, 0.5);
          box-shadow: inset 0 1px $borders_color,
                      inset 0 -1px $borders_color,
                      inset 1px 0 $borders_color,
                      inset -1px 0 $borders_color;
        }
        &:active, &.active-page, &.active-page:hover {
          background-color: $base_color;

          @if $_tab==top {
            box-shadow: inset 0 1px $borders_color,
                        inset 0 -1px $base_color,
                        inset 1px 0 $borders_color,
                        inset -1px 0 $borders_color;
          }
          @else if $_tab==bottom {
            box-shadow: inset 0 -1px $base_color,
                        inset 0 -1px $borders_color,
                        inset 1px 0 $borders_color,
                        inset -1px 0 $borders_color;
          }
          @else if $_tab==left {
            box-shadow: inset 0 1px $borders_color,
                        inset 0 -1px $borders_color,
                        inset 1px 0 $borders_color,
                        inset -1px 0 $base_color;
          }
          @else if $_tab==right {
            box-shadow: inset 0 1px $borders_color,
                        inset 0 -1px $borders_color,
                        inset 1px 0 $base_color,
                        inset -1px 0 $borders_color;
          }
        }
      }
    }
    GtkLabel { //tab text
      padding: 0 2px; // needed for a nicer focus ring
      color: $insensitive_fg_color;
    }
    .prelight-page GtkLabel, GtkLabel.prelight-page {
      // prelight tab text
      color: mix($fg_color, $insensitive_fg_color, 50%);
    }
    .active-page GtkLabel, GtkLabel.active-page {
      // active tab text
      color: $fg_color;
    }
    .button { //tab close button
      padding: 0;
      @extend %undecorated_button;
      color: mix($bg_color, $fg_color, 35%);

      &:hover {
        color: lighten(red, 15%);
      }
      &:active {
        color: $selected_bg_color;
      }
      & > GtkImage { // this is a hack which makes tabs grow
        padding: 2px;
      }
    }
  }
  &.arrow {
    color: $insensitive_fg_color;
    &:hover { color: mix($fg_color, $insensitive_fg_color, 50%); }
    &:active { color: $fg_color; }
    &:insensitive {
      color: transparentize($insensitive_fg_color,0.3);
    }
  }
}

//
// Scrollbars
//
$_scrollbar_bg_color: darken($base_color, 1%);

.scrollbar {
  -GtkRange-slider-width: 13;
  -GtkRange-trough-border: 0;
  -GtkScrollbar-has-backward-stepper: false;
  -GtkScrollbar-has-forward-stepper: false;
  -GtkScrollbar-min-slider-length: 42; // minimum size for the slider.
                                       // sadly can't be in '.slider'
                                       // where it belongs
  -GtkRange-stepper-spacing: 0;
  -GtkRange-trough-under-steppers: 1;

  $_slider_margin: 3px;
  $_slider_fine_tune_margin: 4px;

  .button {
    border: none;
  }

  &.overlay-indicator {
    &:not(.dragging):not(.hovering) { // Overlay scrolling indicator
      opacity: 0.4;

      -GtkRange-slider-width: 6px;

      .slider {
        margin: 0;
        background-color: mix($fg_color, $bg_color, 70%);
        border: 1px solid if($variant == 'light', transparentize(white, 0.4), transparentize(black, 0.7));
        background-clip: padding-box;
      }

      .trough {
        border-style: none;
        background-color: transparent;
      }

      // w/o the following margin tweaks the slider shrinks when hovering/dragging
      &.vertical .slider {
        margin-top: $_slider_margin - 1px;
        margin-bottom: $_slider_margin - 1px;
      }

      &.horizontal .slider {
        margin-left: $_slider_margin - 1px;
        margin-right: $_slider_margin - 1px;
      }

    }

    &.dragging,
    &.hovering { opacity: 0.99; }
  }

  // trough coloring
  .trough {
    background-color: $_scrollbar_bg_color;
    border: 1px none $borders_color;
  }

  // slider coloring
  .slider {
    background-color: mix($fg_color, $bg_color, 40%);

    &:hover { background-color: mix($fg_color, $bg_color, 30%); }

    &:prelight:active,
    &:active { background-color: $selected_bg_color;}

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

  // sizing
  .slider {
    border-radius: 100px;
    margin: $_slider_margin;
  }

  &.fine-tune .slider { margin: $_slider_fine_tune_margin; }

  &.vertical {

    .slider {
      margin-left: 1px + $_slider_margin;

      &:dir(rtl) {
        margin-left: $_slider_margin;
        margin-right: 1px + $_slider_margin;
      }
    }

    &.fine-tune .slider {
      margin-left: 1px + $_slider_fine_tune_margin;

      &:dir(rtl) {
        margin-left: $_slider_fine_tune_margin;
        margin-right: 1px + $_slider_fine_tune_margin;
      }
    }

    .trough {
      border-left-style: solid;

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

  &.horizontal {

    .slider { margin-top: 1px + $_slider_margin; }

    &.fine-tune .slider { margin-top: 1px + $_slider_fine_tune_margin; }

    .trough { border-top-style: solid; }
  }
}

.scrollbars-junction,
.scrollbars-junction.frame { // the small square between two scrollbars
  border-color: transparent;
  // the border image is used to add the missing dot between the borders, details, details, details...
  border-image: linear-gradient(to bottom, $borders_color 1px, transparent 1px) 0 0 0 1 / 0 1px stretch;
  background-color: $_scrollbar_bg_color;

  &:dir(rtl) { border-image-slice: 0 1 0 0; }
}


//
// Switches
//
GtkSwitch {
  font: 1;
  -GtkSwitch-slider-width: 52;
  -GtkSwitch-slider-height: 24;
  outline-color: transparent;

  &.trough, &.slider {
    background-size: 52px 24px;
    background-repeat: no-repeat;
    background-position: right center;
    color: transparent;
    border-color: transparent;
    border-image: none;
    border-style: none;
    box-shadow: none;

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

@each $k,$l in ('',''),
               (':active','-active'),
               (':insensitive','-insensitive'),
               (':active:insensitive','-active-insensitive') {

  // load switch troughs from .png files in assets directory

  GtkSwitch.trough#{$k} {
    background-image: -gtk-scaled(url("assets/switch#{$l}#{$asset_suffix}.png"),url("assets/switch#{$l}#{$asset_suffix}@2.png"));
  }

  WingpanelWidgetsIndicatorPopover.popover .menuitem:hover GtkSwitch.trough#{$k},
  .menu .menuitem:hover GtkSwitch.trough#{$k},
  .list-row:selected GtkSwitch.trough#{$k},
  GtkInfoBar GtkSwitch.trough#{$k} {
    background-image: -gtk-scaled(url("assets/switch#{$l}-selected.png"),url("assets/switch#{$l}-selected@2.png"));
  }

  .header-bar GtkSwitch.trough#{$k},
  .primary-toolbar GtkSwitch.trough#{$k} {
    background-image: -gtk-scaled(url("assets/switch#{$l}-header#{$darker_asset_suffix}.png"),url("assets/switch#{$l}-header#{$darker_asset_suffix}@2.png"));
  }
}

//
// Check and Radio items *
//
@each $w,$a in ('check', 'checkbox'),
               ('radio','radio') {

  //standard checks and radios
  @each $s,$as in ('','-unchecked'),
                  (':insensitive','-unchecked-insensitive'),
                  (':inconsistent', '-mixed'),
                  (':inconsistent:insensitive', '-mixed-insensitive'),
                  (':checked', '-checked'),
                  (':checked:insensitive','-checked-insensitive') {
    .#{$w}#{$s} {
      -gtk-icon-source: -gtk-scaled(url("assets/#{$a}#{$as}#{$asset_suffix}.png"),
                                    url("assets/#{$a}#{$as}#{$asset_suffix}@2.png"));
    }

    %osd_check_radio {
      .#{$w}#{$s} {
        -gtk-icon-source: -gtk-scaled(url("assets/#{$a}#{$as}-dark.png"),
                                      url("assets/#{$a}#{$as}-dark@2.png"));
      }
    }
    // the borders of checks and radios are
    // too similar in luminosity to the selected background color, hence
    // we need special casing.
    WingpanelWidgetsIndicatorPopover.popover .menuitem:hover .#{$w}#{$s},
    .menu .menuitem.#{$w}#{$s}:hover,
    GtkTreeView.view.#{$w}#{$s}:selected,
    .list-row:selected .#{$w}#{$s},
    GtkInfoBar .#{$w}#{$s} {
      -gtk-icon-source: -gtk-scaled(url("assets/#{$a}#{$as}-selected.png"),
                                    url("assets/#{$a}#{$as}-selected@2.png"));
    }
  }
}

// Selectionmode
@each $s,$as in ('','-selectionmode'),
                  (':checked', '-checked-selectionmode') {
  .view.content-view.check#{$s}:not(.list) {
    -gtk-icon-source: -gtk-scaled(url("assets/checkbox#{$as}#{$asset_suffix}.png"),
                                    url("assets/checkbox#{$as}#{$asset_suffix}@2.png"));
    background-color: transparent;
  }
}

GtkCheckButton.text-button, GtkRadioButton.text-button {
  // this is for a nice focus on check and radios text
  padding: 1px 2px 4px;
  outline-offset: 0;
  &:insensitive,
  &:insensitive:active,
  &:insensitive:inconsistent {
    // set insensitive color, which is overriden otherwise
    color: $insensitive_fg_color;
  }
}

//
// GtkScale
//
.scale {
  -GtkScale-slider-length: 15;
  -GtkRange-slider-width: 15;
  -GtkRange-trough-border: 0;
  outline-offset: -1px;
  outline-radius: 2px;

  color: gtkalpha(currentColor, 0.7);

  &.trough { margin: 5px; }
  &.fine-tune {
    &.trough { border-radius: 5px; margin: 3px; }
  }
  &.slider {
    $_slider_border: if($variant=='light', transparentize(darken($button_border,25%), 0.5), darken($button_border,2%));

    background-clip: border-box;
    background-image: linear-gradient(to bottom, $button_bg);
    border: 1px solid $_slider_border;
    border-radius: 50%;
    box-shadow: none;

    &:hover {
    background-image: linear-gradient(to bottom, lighten($button_bg, 5%));
    border-color: $_slider_border;
    }
    &:insensitive {
      background-image: linear-gradient(to bottom, mix($entry_bg, $bg_color, 55%));
      border-color: transparentize($_slider_border, 0.2);
    }
    &:active {
      background-image: linear-gradient(to bottom, $selected_bg_color);
      border-color: $selected_bg_color;
    }
    //OSD sliders
    .osd & {
      background-image: linear-gradient(to bottom, $osd_bg_color);
      border-color: $selected_bg_color;

      &:hover { background-image: linear-gradient(to bottom, $selected_bg_color); }
      &:active {
        background-image: linear-gradient(to bottom, darken($selected_bg_color, 10%));
        border-color: darken($selected_bg_color, 10%);
      }
    }
    //selected list-row and infobar sliders
    WingpanelWidgetsIndicatorPopover.popover .menuitem:hover &,
    .menu .menuitem:hover &,
    .list-row:selected &,
    GtkInfoBar & {
      background-image: linear-gradient(to bottom, $selected_fg_color);
      border-color: $selected_fg_color;

      &:hover {
        background-image: linear-gradient(to bottom, mix($selected_fg_color, $selected_bg_color, 85%));
        border-color: mix($selected_fg_color, $selected_bg_color, 85%);
      }
      &:active {
        background-image: linear-gradient(to bottom, mix($selected_fg_color, $selected_bg_color, 50%));
        border-color: mix($selected_fg_color, $selected_bg_color, 50%);
      }
      &:insensitive{
        background-image: linear-gradient(to bottom, mix($selected_fg_color, $selected_bg_color, 55%));
        border-color: mix($selected_fg_color, $selected_bg_color, 55%);
      }
    }
  }
  &.trough {

    $_scale_trough_bg: if($variant == 'light', $button_border, darken($bg_color, 5%));

    border: none;
    border-radius: 2.5px;
    background-image: linear-gradient(to bottom, $_scale_trough_bg);
    &.highlight {
      background-image: linear-gradient(to bottom, $selected_bg_color);

      &:insensitive {
        background-image: linear-gradient(to bottom, transparentize($selected_bg_color, 0.45));
      }
    }
    &:insensitive {
      background-image: linear-gradient(to bottom, transparentize($_scale_trough_bg, 0.45));
    }

    //OSD troughs
    .osd & {
      background-image: linear-gradient(to bottom, lighten($osd_bg_color, 7%));
      outline-color: transparentize($osd_fg_color, 0.8);
      &.highlight {
        background-image: none;
        background-image: linear-gradient(to bottom, $selected_bg_color);
      }
      &:insensitive {  }
    }
    // troughs in selected list-rows and infobars
    WingpanelWidgetsIndicatorPopover.popover .menuitem:hover &,
    .menu .menuitem:hover &,
    .list-row:selected &,
    GtkInfoBar & {
      background-image: linear-gradient(to bottom, transparentize(black, 0.8));

      &.highlight {
        background-image: linear-gradient(to bottom, $selected_fg_color);

        &:insensitive { background-image: linear-gradient(to bottom, mix($selected_fg_color, $selected_bg_color, 55%)); }
      }
      &:insensitive { background-image: linear-gradient(to bottom, transparentize(black, 0.9)); }
    }
  }
}

//
// Progress bars
//
GtkProgressBar {
  padding: 0;
  font-size: smaller;
  color: transparentize($fg_color, 0.3);

  &.osd {
    -GtkProgressBar-xspacing: 0;
    -GtkProgressBar-yspacing: 0;
    -GtkProgressBar-min-horizontal-bar-height: 3;
  }
}

// moving bit
.progressbar {
  background-color: $selected_bg_color;
  border: none;
  border-radius: 3px;
  box-shadow: none; //needed for clipping
  &.left.right {

  }
  &.osd {
    background-color: $selected_bg_color;
  }
  .list-row:selected &,
  GtkInfoBar & { background-color: $selected_fg_color; }
}

.osd .scale.progressbar {
  background-color: $selected_bg_color;
}

// background
GtkProgressBar.trough {
  border: none;
  border-radius: 3px;
  background-color: if($variant == 'light', $button_border, darken($bg_color, 5%));

  &.osd {
    border-style: none;
    background-color: transparent;
    box-shadow: none;
  }
  .list-row:selected &,
  GtkInfoBar & { background-color: transparentize(black, 0.8); }
}

//
// Level Bar
//
GtkLevelBar {
  -GtkLevelBar-min-block-width: 34;
  -GtkLevelBar-min-block-height: 3;

  &.vertical {
    -GtkLevelBar-min-block-width: 3;
    -GtkLevelBar-min-block-height: 34;
  }
}

.level-bar {
  &.trough {
    @extend GtkProgressBar.trough;
    padding: 3px;
    border-radius: 4px;
  }
  &.fill-block {
    // FIXME: it would be nice to set make fill blocks bigger, but we'd need
    // :nth-child working on discrete indicators
    border: 1px solid $selected_bg_color;
    background-color: $selected_bg_color;
    border-radius: 2px;

    &.indicator-discrete {
      &.horizontal { margin: 0 1px; }
      &.vertical { margin: 1px 0; }
    }
    &.level-high {
      border-color: $success_color;
      background-color: $success_color;
    }
    &.level-low {
      border-color: $warning_color;
      background-color: $warning_color;
    }
    &.empty-fill-block {
      background-color: if($variant=='light', transparentize($fg_color,0.8), $base_color);
      border-color: if($variant=='light', transparentize($fg_color,0.8), $base_color);
    }
  }
}


//
// Frames
//
.frame {
  border: 1px solid $borders_color;
  &.flat { border-style: none; }
  padding: 0;
  &.action-bar {
    padding: 6px;
    border-width: 1px 0 0;
  }
}

GtkScrolledWindow {
  GtkViewport.frame { // avoid double borders when viewport inside
                      // scrolled window
    border-style: none;
  }
}

//vbox and hbox separators
.separator {
  // always disable separators
  // -GtkWidget-wide-separators: true;
  color: transparentize(black, 0.9);

  // Font and File button separators
  GtkFileChooserButton &,
  GtkFontButton &,
  GtkFileChooserButton &.vertical,
  GtkFontButton &.vertical {
    // always disable separators
    -GtkWidget-wide-separators: true;
  }
}

//
// Lists
//
.list {
  background-color: $base_color;
  border-color: $borders_color;
}

.list-row,
.grid-child {
  padding: 2px;
}

.list-row.activatable {
  // let's take care of background colors
  &:hover {
    background-color: if($variant == 'light', transparentize(black, 0.95), transparentize(white, 0.97));
  }
  &:active {
    color: $fg_color;
  }
  &:selected {
    &:active { color: $selected_fg_color; }
    &:hover { background-color: mix(black, $selected_bg_color, 10%); }
    &:insensitive {
      color: transparentize($selected_fg_color, 0.3);
      background-color: transparentize($selected_bg_color, 0.3);
      .label { color: inherit; }
    }
  }
}

.list-row:selected {
  @extend %selected_items;
  .button { @extend %selected-button }
}

// transition
.list-row, list-row.activatable {
  transition: all 150ms $ease-out-quad;
  &:hover { transition: none; }
}

//
// App Notifications
//
.app-notification,
.app-notification.frame {
  padding: 10px;
  color: $dark_sidebar_fg;
  background-color: $dark_sidebar_bg;
  background-clip: border-box;
  border-radius: 0 0 2px 2px;
  border-width: 0 1px 1px 1px;
  border-style: solid;
  border-color: darken($dark_sidebar_bg, 10%);

  .button {
    @include button(osd);
    &.flat {
      @extend %undecorated_button;
      border-color: transparentize($selected_bg_color, 1);
      &:insensitive { @extend %undecorated_button; }
    }
    &:hover { @include button(osd-hover); }
    &:active, &:checked { @include button(osd-active); background-clip: padding-box; }
    &:insensitive { @include button(osd-insensitive);
    }
  }
}

//
// Expanders
//
.expander {
  -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
//
GtkCalendar {
  color: $fg_color;
  border: 1px solid $borders_color;
  border-radius: 3px;
  padding: 2px;

  &:selected {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
    border-radius: 1.5px;
  }
  &.header {
    color: $fg_color;
    border: none;
    border-radius: 0;
  }
  &.button, &.button:focus {
    color: transparentize($fg_color,0.55);
    @include button(undecorated);

    &:hover {
      color: $fg_color;
    }
    &:insensitive {
      color: $insensitive_fg_color;
      background-color: transparent;
      background-image: none;
    }
  }
  &:inconsistent { color: gtkalpha(currentColor,0.55); }
  &.highlight {
    color: $fg_color;
  }
}

//
// Dialogs
//
.message-dialog .dialog-action-area .button {
  padding: 8px;
}

.message-dialog { // Message Dialog styling
  -GtkDialog-button-spacing: 0;

  .titlebar { background-color: $header_bg; border-bottom: 1px solid darken($header_bg, 7%) }

  &.csd { // rounded bottom border styling for csd version
    &.background {
      border-bottom-left-radius: 3px;
      border-bottom-right-radius: 3px;
      border: none;
    }
    .dialog-action-area .button {
      padding: 8px;
      border-radius: 0;

      @extend %middle_button;

      &:hover, &:active, &: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: 3px;
    }
    %first_button {
      border-left-style: none;
      border-bottom-left-radius: 3px;
    }
  }
}

GtkFileChooserDialog {
  .search-bar {
    background-color: $bg_color;
    border-color: $borders_color;
    box-shadow: none;
  }
  .dialog-action-box {
    border-top: 1px solid $borders_color;
  }
}

//
// Sidebar
//
.sidebar, .sidebar .view {
  border: none;
  background-color: lighten($bg_color, 2%);

  &:selected { @extend %selected_items; }
  &.separator { @extend .separator; }
}

GtkSidebarRow {
  // Needs overriding of the GtkListBoxRow padding

  &.list-row {
    padding: 0px;
  }
  // Using margins/padding directly in the SidebarRow
  // will make the animation of the new bookmark row jump
  .sidebar-revealer {
    padding: 3px 14px 3px 12px;
  }
  .sidebar-icon {
    &:dir(ltr) { padding-right: 8px; }
    &:dir(rtl) { padding-left: 8px; }
  }
  .sidebar-label {
    &:dir(ltr) { padding-right: 2px; }
    &:dir(rtl) { padding-left: 2px; }
  }
}

GtkPlacesSidebar.sidebar {

  .sidebar-placeholder-row { border: solid 1px $selected_bg_color; }

  .sidebar-new-bookmark-row { background-color: darken($bg_color, 10%); }

  // Preserve everything else of the list-row class
  .list-row.activatable {
    color: transparentize($fg_color, 0.2);
    border-width: 0;
    border-style: solid;

    &:selected { @extend %selected_items; }
  }

  @at-root .sidebar-button.button { // @at-root needded to not change the specificity making button styling inheritance broken
                                    // so istead of "GtkPlacesSidebar.sidebar .sidebar-button.button" [specificity 0,0,3,1]
                                    // the extended selector ".sidebar-button.button" [specificity 0,0,2,0]

    &.image-button { padding: 3px; }

    outline-radius: 50%;
    border-radius: 50%;

    @extend .button.flat;

    &:not(:hover):not(:active) > GtkImage { opacity: 0.5 };
  }
  // this is for indicating which sidebar row generated a popover
  // see https://bugzilla.gnome.org/show_bug.cgi?id=754411
  .has-open-popup { @extend .list-row.activatable:hover; }
}

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

//
// File chooser
//
GtkPlacesView {
  .server-list-button > GtkImage {
    transition: 200ms $ease-out-quad;
    -gtk-icon-transform: rotate(0turn);
  }

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

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

//
// Paned
//
GtkPaned {                        // this is for the standard paned separator

  -GtkPaned-handle-size: 1;       // sets separator width

  -gtk-icon-source: none;         // removes handle decoration
  margin: 0 8px 8px 0;            // drag area of the separator, not a real margin

  &:dir(rtl) {
    margin-right: 0;
    margin-left: 8px;
  }
  .pane-separator {
    background-color: $borders_color;
  }
}

GtkPaned.wide {                     // this is for the paned with wide separator
  -GtkPaned-handle-size: 5;         // wider separator here
  margin: 0;                        // no need of the invisible drag area so, reset margin
  .pane-separator {
    background-color: transparent;
    border-style: none solid;
    border-color: $borders_color;
    border-width: 1px;
  }
  &.vertical .pane-separator { border-style: solid none;}
}

//
// GtkInfoBar
//
GtkInfoBar {
  border-style: none;

  .button { @extend %selected-button }
}

.info,
.question,
.warning,
.error,
GtkInfoBar {
  background-color: $selected_bg_color;
  color: $selected_fg_color;
}


//
// Buttons on selected backgrounds
//
%selected-button {
  color: $selected_fg_color;
  outline-color: transparentize($selected_fg_color, 0.7);
  background-color: transparentize($selected_fg_color, 1);
  border-color: transparentize($selected_fg_color, 0.5);

  &.flat {
    @include button(undecorated);
    color: $selected_fg_color;
    background-color: transparentize($selected_fg_color, 1);
  }
  &:hover {
    color: $selected_fg_color;
    outline-color: transparentize($selected_fg_color, 0.7);
    background-color: transparentize($selected_fg_color, 0.8);
    border-color: transparentize($selected_fg_color, 0.2);
  }
  &:active, &:active:hover, &:checked {
    color: $selected_bg_color;
    outline-color: transparentize($selected_bg_color, 0.7);
    background-color: $selected_fg_color;
    border-color: $selected_fg_color;
  }
  &:insensitive {
    color: transparentize($selected_fg_color, 0.6);
    background-color: transparentize($selected_fg_color, 1);
    border-color: transparentize($selected_fg_color, 0.8);

    &:active, &:checked {
      color: transparentize($selected_bg_color, 0.6);
      background-color: transparentize($selected_fg_color, 0.8);
      border-color: transparentize($selected_fg_color, 0.8);
    }
  }
}

//
// 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: lighten($osd_bg_color, 10%);
    background-clip: padding-box;
  }

  color: $osd_fg_color;
  border-radius: 2px;

  &.window-frame.csd {
    background-color: transparent;
  }
}

.tooltip * { //Yeah this is ugly
  padding: 4px;
  background-color: transparent;
  color: inherit; // just to be sure
}

//
// Color Chooser
//

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

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

  // border rounding
  &.top {
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;
  }
  &.bottom {
    border-bottom-left-radius: 3px;
    border-bottom-right-radius: 3px;
  }
  &.left, &:first-child, &:first-child .overlay {
    border-top-left-radius: 3px;
    border-bottom-left-radius: 3px;
  }
  &.right, &:last-child, &:last-child .overlay {
    border-top-right-radius: 3px;
    border-bottom-right-radius: 3px;
  }
  &:only-child, &:only-child .overlay {
    border-radius: 3px;
  }
  // nth-child works just on the custom colors row

  // hover effect
  &:hover,
  &:hover:selected {
    background-image: linear-gradient(to bottom, transparentize(white, 0.8));
  }

  // no hover effect for the colorswatch in the color editor
  GtkColorEditor & {
    border-radius: 3px; // same radius as the entry
    &:hover {
      background-image: none;
    }
  }

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

  // border color
  &.overlay,
  &.overlay:selected {
    border: 1px solid transparentize(black, 0.85);
    &:hover { border-color: transparentize(black, 0.75); }
  }

  // make the add color button looks like, well, a button
  &#add-color-button {
    border-style: solid; // the borders are drawn by the overlay for standard colorswatches to have them semi
    border-width: 1px;   // translucent on the colored background, here it's not necessary so they need to be set
    @include button(normal);
    &:hover { @include button(hover); }
    .overlay { @include button(undecorated); } // reset the overlay to not cover the button style underneath
  }
}

GtkColorButton.button {
  padding: 5px; // Uniform padding on the GtkColorButton

  GtkColorSwatch { border-radius: 0; }
}

//
// Misc
//
//content view (grid/list)
.content-view {
  background-color: $base_color;
  &:hover { -gtk-image-effect: highlight; }
  &.rubberband { @extend .rubberband; }
}

.scale-popup .button { // +/- buttons on GtkVolumeButton popup
  padding: 6px;
  &:hover {
    @include button(hover);
  }
}

GtkVolumeButton.button { padding: 8px; }

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

.monospace { font: Monospace; }

//
// Overshoot
//
// This is used by GtkScrolledWindow, when content is touch-dragged past boundaries.
// This draws a box on top of the content, the size changes programmatically.
.overshoot {
  &.top { @include overshoot(top); }
  &.bottom { @include overshoot(bottom); }
  &.left { @include overshoot(left); }
  &.right { @include overshoot(right); }
}

//
// Undershoot
//
// Overflow indication, 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); }
}

//
// Window Decorations
//

.window-frame {
  border-radius: if($darker=='false' and $variant=='light', 4px 4px 0 0, 3px 3px 0 0);
  border-width: 0px;

  $_wm_border: if($variant=='light', transparentize(black, 0.9), transparentize(black, 0.45));

  box-shadow: 0 0 0 1px if($darker=='true' or $variant == 'dark', darken($header_bg, 7%), $_wm_border),
              0 8px 8px 0 if($variant == 'light', opacify($_wm_border, 0.1), transparentize($_wm_border, 0.2));

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

  &:backdrop {
    box-shadow: 0 0 0 1px if($darker=='true' or $variant == 'dark', transparentize(darken($header_bg, 7%), 0.1), $_wm_border),
                0 5px 5px 0 if($variant == 'light', opacify($_wm_border, 0.1), transparentize($_wm_border, 0.2));
  }
  &.tiled {
    border-radius: 0;
  }
  &.popup {
    box-shadow: none;
    border-radius: 0;
  }
  // server-side decorations as used by mutter
  &.ssd {
    border-radius: if($darker=='false' and $variant=='light', 4px 4px 0 0, 3px 3px 0 0);
    box-shadow: 0 0 0 1px if($darker=='true' or $variant == 'dark', transparentize(black, 0.35), $_wm_border);

    &.maximized { border-radius: 0; }
  }
  &.csd {
    &.popup {
      border-radius: 2px;
      box-shadow: 0 3px 6px if($variant == 'light', $_wm_border, transparentize($_wm_border, 0.1)),
                  0 0 0 1px if($variant == 'light', $_wm_border, darken($bg_color, 10%));
    }
    &.tooltip {
      border-radius: 2px;
      box-shadow: 0 1px 3px 1px if($variant == 'light', $_wm_border, transparentize($_wm_border, 0.3));
    }
    &.message-dialog { border-radius: 3px; }
  }
  &.solid-csd {
    border-radius: 0;
    margin: 1px;
    background-color: $header_bg;
    box-shadow: none;
  }
}

//
// Titlebuttons
//
.header-bar,
.titlebar {

  &.default-decoration .button.titlebutton { // no vertical padding for ssd buttons
    padding-top: 0px;                        // already handled by the titlebar-padding
    padding-bottom: 0px;
  }

  .button.titlebutton {
    @extend .image-button;

    &:not(GtkMenuButton) {
      padding-top: 8px;
      padding-bottom: 8px;
    }
    padding-left: 4px;
    padding-right: 4px;

    @include button(undecorated);
    background-color: transparentize($header_bg, 1);

    &:hover {
      @include button(header-hover);
    }
    &:active, &:checked {
      @include button(header-active);
    }
    &.close, &.maximize, &.minimize {
      color: transparent;
      background-color: transparent;
      background-position: center;
      background-repeat: no-repeat;
      border-width: 0;

      &:backdrop { opacity: 1; }
    }
    // Load png assets for each button
    @each $k in ('close','maximize', 'minimize') {
      @each $l, $m in ('',''), (':backdrop','-backdrop'), (':hover','-hover'), (':active','-active') {

        &.#{$k}#{$l} { background-image: -gtk-scaled(url('assets/titlebutton-#{$k}#{$m}#{$darker_asset_suffix}.png'),
                                                     url('assets/titlebutton-#{$k}#{$m}#{$darker_asset_suffix}@2.png')); }
      }
    }
    .maximized & {
      button.titlebutton {
      padding: 0;
      min-width: 24px;

      @include button(undecorated);
      background-color: transparentize($header_bg, 1);

      &:hover {
        @include button(header-hover);
      }
      &:active, &:checked {
        @include button(header-active);
      }
      &.close, &.maximize, &.minimize {
        color: transparent;
        background-color: transparent;
        background-position: center;
        background-repeat: no-repeat;
        border-width: 0;

        &:backdrop { opacity: 1; }
      }
      // Load png assets for each button
      @each $k in ('close', 'minimize') {
        @each $l, $m in ('',''), (':backdrop','-backdrop'), (':hover','-hover'), (':active','-active') {

          &.#{$k}#{$l} { background-image: -gtk-scaled(url('assets/titlebutton-#{$k}#{$m}#{$darker_asset_suffix}.png'),
                                                       url('assets/titlebutton-#{$k}#{$m}#{$darker_asset_suffix}@2.png')); }
          &.maximize#{$l} { background-image: -gtk-scaled(url('assets/titlebutton-unmaximize#{$m}#{$darker_asset_suffix}.png'),
                                                       url('assets/titlebutton-unmaximize#{$m}#{$darker_asset_suffix}@2.png')); }
        }
      }
    }
  }
  }
}

// catch all extend
%selected_items {
  background-image: none;
  background-color: $selected_bg_color;
  color: $selected_fg_color;
  outline-color: transparentize($selected_fg_color, 0.7);
}