horst3180_arc-theme/common/gtk-3.0/3.20/sass/_common.scss

@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;

  -GtkScrolledWindow-scrollbar-spacing: 0;

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

  -GtkTreeView-horizontal-separator: 4;

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

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

  // 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;
  -gtk-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
}

*:disabled {
  -gtk-icon-effect: dim;
}

.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,
textview text {
  color: $text_color;
  background-color: $base_color;

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

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

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

iconview {
  color: $text_color;
  background-color: $base_color;

  &:selected,
  &:selected:focus {
    border-radius: 2px;
    @extend %selected_items;
  }
}

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

flowbox {
  rubberband { @extend rubberband }

  flowboxchild {
    padding: 3px;
    border-radius: 2px;

    &:selected {
      outline-offset: -2px;

      @extend %selected_items;
    }
  }
}

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

.dim-label {
  opacity: 0.55;
}

assistant {
  .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;
  }
}

%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: 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 {
  min-height: 22px;
  border: 1px solid;
  padding: 2px 8px;

  caret-color: currentColor;
  border-radius: 3px;
  transition: all 200ms $ease-out-quad;

  &.search { border-radius: 20px; }

  @include entry(normal);

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

    &.left { padding-left: 0; padding-right: 5px; }
    &.right { padding-right: 0; padding-left: 5px; }
  }

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

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

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

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

  progress {
    margin: 0 -6px;
    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 in (warning, $warning_color),
                             (error, $error_color) {
    &.#{$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: $selected_fg_color;
        background-image: linear-gradient(to bottom, $e_color);
        box-shadow: none;
      }
      selection, selection:focus {
        background-color: $selected_fg_color;
        color: $e_color;
      }
    }
  }

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

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

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

//
// 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;

  min-height: 22px;
  min-width: 20px;
  transition: $_button_transition;
  border: 1px solid;
  border-radius: 3px;
  padding: 2px 6px;

  @include button(normal);

  separator { margin: 4px 1px; }

  &.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: $_button_transition; }
    }
  }
  &:hover {
    @include button(hover);
    -gtk-icon-effect: highlight;
  }
  &:active, &:checked {
    background-clip: if($variant=='light', border-box, padding-box);
    @include button(active);
    transition-duration: 50ms;
  }

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

  &.flat:disabled {
    @include button(undecorated);
  }
  &:disabled {
    @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 {
      min-height: 48px;
      min-width: 48px;
    }

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

    &.flat {
      @include button(undecorated);
      box-shadow: none;
      &:hover { @include button(osd-hover); }
      &:disabled {
        @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 in (suggested-action, $suggested_color),
                             (destructive-action, $destructive_color) {
    &.#{$b_type} {
      @include button(suggested_destructive, $b_color);

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

  &.image-button {
    min-width: 32px;
    padding-left: 0;
    padding-right: 0;
  }

  &.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;
    }
  }

  .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

    > label {
      padding-left: 6px;  // label padding
      padding-right: 6px; //
    }
    > image {
      padding-left: 6px;
      padding-right: 6px;
      padding-top: 3px;
      padding-bottom: 3px;
    }
    &.text-button {
      padding-left: 10px;
      padding-right: 10px;
    }
    &.image-button {
      padding-left: 2px;
      padding-right: 2px;
    }

    &.needs-attention > label,
    &.needs-attention > image { @extend %needs_attention; }
    &.needs-attention:active > label,
    &.needs-attention:active > image,
    &.needs-attention:checked > label,
    &.needs-attention:checked > image {
      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 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); }
  &:disabled:active,
  &:disabled:checked { @include button(insensitive-active); }
}

// More inline toolbar buttons
toolbar.inline-toolbar toolbutton {
  & > 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 { border-#{$_border}-color: if($var=='light', $error_color, transparentize($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#{$e_type}:focus:not(:only-child) {
        + entry,
        + button,
        + combobox > box > button.combo { border-#{$_border}-color: if($var=='light', $e_color, $e_border); }
      }
    }
    > button:checked + entry { border-#{$_border}-color: if($var=='light', $selected_bg_color, $e_border); }
  }
  @if $button_rules=='true' {
    > button + button { border-#{$_border}-style: none; }

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

    > button:first-child:hover:not(:checked):not(:active),
    > button:checked + button:not(:checked):not(:active):hover,
    > entry + button:not(:checked):not(:active):not(:only-child):hover { 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,
modelbutton.flat {
  transition: none;
  min-height: 22px;
  padding-left: 8px;
  padding-right: 8px;
  outline-offset: -2px;
  border-radius: 2px;

  @extend %undecorated_button;

  &: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; }

  // FIXME: temporary workaround
  check:last-child,
  radio:last-child { margin-left: 8px; }

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

modelbutton.flat arrow {
  &, &:hover { background: none; }
  &.left { -gtk-icon-source: -gtk-icontheme("pan-start-symbolic"); }
  &.right { -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); }
}

//
// 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 {

  button:active { color: $selected_fg_color; }
  &:disabled { color: $insensitive_fg_color; }

  &:not(.vertical) {
    button, entry { @extend %linked; }

    &:dir(ltr) entry,
    &:dir(rtl) button.up { border-radius: 3px 0 0 3px; }

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

    > button:hover:not(:active),
    > button:hover + button { box-shadow: inset 1px 0 $button_border; }

    > button:first-child:hover:not(:active),
    > button.up:dir(rtl):hover:not(:active),
    > entry + button:not(:active):hover { box-shadow: none; }

    > entry:focus + button { border-left-color: if($variant=='light', $selected_bg_color, $entry_border); }
  }
  &.vertical {
    button, entry {
      padding-left: 4px;
      padding-right: 4px;
      min-width: 0;

      @extend %linked_vertical;
    }

    button.up { border-radius: 3px 3px 0 0; }

    > entry:focus + button { border-top-color: if($variant=='light', $selected_bg_color, $entry_border); }
  }
}

//
// Comboboxes
//
combobox {
  button.combo {
    min-width: 0;       // otherwise the arrow placement is unsymmetric
    padding-left: 8px;  //
    padding-right: 8px  //
  }
  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; }
    }
  }

  .linked:not(.vertical) > & > box > button.combo {
    // the combobox is a composite widget so the way we do button linking doesn't
    // work, special case needed.
    &:dir(ltr),
    &:dir(rtl) { @extend %linked_middle; } // specificity bump
  }

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

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

//
// Toolbars
//
toolbar {
  -GtkWidget-window-dragging: true;
  padding: 4px;
  background-color: $bg_color;

  separator { background: none; }
  &.horizontal separator { margin: 0 6px; }
  &.vertical separator { margin: 6px 0; }

  .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;
}

searchbar {
  background-color: $bg_color;
  border-style: solid;
  border-color: $borders_color;
  border-width: 0 0 1px;
  padding: 3px;
}

actionbar {
  padding: 6px;
  border-top: 1px solid $borders_color;
  background-color: darken($bg_color, 3%);
}

//
// Headerbars
//
headerbar {
  min-height: 42px;
  padding: 0 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
    border-radius: if($darker=='false' and $variant=='light', 4px 4px 0 0, 3px 3px 0 0);
    background-color: $header_bg;
    border-color: $header_border;
  }

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

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

  .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: $selected_fg_color;
    background-color: $selection_mode_bg;
    border-color: darken($selection_mode_bg, 4%);
    box-shadow: none;

    &:backdrop {
      background-color: $selection_mode_bg;
      color: transparentize($selected_fg_color, 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: $selected_fg_color;
      }
      &:disabled {
        color: transparentize($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: 0 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); }
  }

  // Fixes double backgrounds on paned headerbars
  &:not(headerbar),
  &:backdrop:not(headerbar) {
    window > &,
    window.csd > & {
      padding: 0;
      border: none;
      background: none;
    }
  }
  // Separator in Gnome Tweak Tool
  separator { background-color: $header_border; }
}

// more paned headerbar fixes (Gedit)
paned.titlebar {
  separator { background-color: transparent; }

  > headerbar {
    &:not(:only-child):not(:first-child):not(:last-child) { border-radius: 0;}
    &:first-child { border-top-right-radius: 0; }
    &:last-child { border-top-left-radius: 0; } 
  }
}

// Only extending headerbar avoids some problems (Gnome Documents searchbar)
headerbar {
  separator.titlebutton { @extend %header_separator; }

  @extend %header_widgets;

  entry, button, separator {
    margin-top: 6px;
    margin-bottom: 6px;
  }
}

%header_separator {
  min-width: 1px;
  min-height: 1px;
  background: none;
  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; }
    }
    &:disabled { @include entry(header-insensitive); }

    selection:focus {
      background-color: $selected_fg_color;
      color: $selected_bg_color;
    }

    progress {
      border-color: $selected_bg_color;
      background-image: none;
      background-color: transparent;
    }

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

        &:focus {
          color: $selected_fg_color;
          background-image: linear-gradient(to bottom, $e_color);
        }
        selection, selection:focus {
          background-color: $selected_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);
    }
    &:disabled { @include button(header-insensitive); }
    &:disabled:active, &:disabled:checked { @include button(header-insensitive-active); }
  }

  // Linking stuff

  // Reset buttons
  .linked:not(.vertical):not(.path-bar) > button,
  .linked:not(.vertical):not(.path-bar) > button:hover,
  .linked:not(.vertical):not(.path-bar) > button:active,
  .linked:not(.vertical):not(.path-bar) > button:checked,
  .linked:not(.vertical):not(.path-bar) > button:disabled {
    border-radius: 3px;
    border-style: solid;
  }
  .linked:not(.vertical):not(.path-bar), .linked:not(.vertical).path-bar {
    > button:hover:not(:checked):not(:active):not(:only-child),
    > button:hover:not(:checked):not(:active) + button:not(:checked):not(:active) { 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($header_button_bg, 15%); }
      &:active, &:checked { @include button(header-active); }
      &:disabled { color: transparentize($header_fg, 0.4); }

      &, &:hover, &:active, &:checked, &:disabled { @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 in (suggested-action, $suggested_color),
                             (destructive-action, $destructive_color) {
    button.#{$b_type} {
      @include button(suggested_destructive, $b_color);

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

  // Headerbar Spinbuttons
  spinbutton:not(.vertical) {
    &:focus {
    color: $selected_fg_color;
    caret-color: $selected_fg_color;
    }
    button {
      &,&:disabled { @include button(header-hover); }

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

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

    > button:hover:not(:active),
    > button:hover + button { box-shadow: inset 1px 0 $header_button_border; }

    > button:first-child:hover:not(:active),
    > entry + button:not(:active):hover { box-shadow: none; }

    > entry:focus + button { border-left-color: if($variant=='light' and $darker=='false', $selected_bg_color, $header_entry_border); }
  }

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

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

      &:hover { @include entry(header-focus); box-shadow: none; }
      &:disabled { @include entry(header-insensitive); }
    }
    &.linked 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; } }
      }
    }
    &.linked button.combo {
      &:dir(ltr) {
        &, &:hover, &:active, &:checked, &:disabled {
          border-top-left-radius: 0;
          border-bottom-left-radius: 0;
        }
      }
      &:dir(rtl) {
        &, &:hover, &:active, &:checked, &:disabled {
          border-top-right-radius: 0;
          border-bottom-right-radius: 0;
        }
      }
    }
  }

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

  progressbar {
    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 {
    $_trough_bg: if($variant=='light' and $darker=='false', opacify($header_button_border, 0.05), $header_button_border);

    &:backdrop { opacity: 0.75; }

    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: $selected_bg_color;
      }
      &:disabled {
        background-image: linear-gradient(to bottom, mix($_slider_bg, $header_bg, 70%));
        border-color: $_slider_border;
      }
    }
    trough {
      background-image: linear-gradient(to bottom, $_trough_bg);

      &:disabled { background-image: linear-gradient(to bottom, if($variant=='light' and $darker=='false', transparentize($_trough_bg, 0.05), transparentize($_trough_bg, 0.1))); }
    }
  }
}

//
// Pathbars
//
.path-bar button {

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

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

//
// 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: 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 unfortunately

    @extend %selected_items;
  }

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

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

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

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

  header {
    button {
      $_column_header_color: mix($fg_color,$base_color,80%);

      min-height: 0;
      min-width: 0;
      padding: 3px 6px;
      font-weight: bold;

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

      &:hover { color: $selected_bg_color; }
      &:active { color: $fg_color; }

      &:active, &:hover { background-color: $base_color; }
      &:active:hover { color: $fg_color; }

      &:disabled {
        border-color: $bg_color;
        background-image: none;
      }
      &:last-child {
        border-right-style: none;
        border-image: none;
      }
    }
  }

  button.dnd,
  header.button.dnd {
    &, &:selected, &:hover, &:active {
      padding: 0 6px;
      transition: none;
      color: $selected_fg_color;
      background-color: $selected_bg_color;
      border-radius: 0;
      border-style: none;
    }
  }
}

//
// Menus
//
menubar,
.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: 6px 8px;
    border: solid transparent;
    border-width: 0;

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

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

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

  separator,
  .csd & separator {
    margin: 2px 0;
    background-color: $_menu_bg;
  }

  menuitem {
    min-height: 16px;
    min-width: 40px;
    padding: 4px;
    border: solid transparent;
    border-width: 1px 0 1px 0;
    &:hover {
      color: $fg_color;
      background-color: if($variant == 'light', transparentize(black, 0.96), transparentize(white, 0.95));
      border: solid if($variant == 'light', transparentize(black, 0.92), transparentize(white, 0.93));
      border-width: 1px 0 1px 0;
    }
    &:disabled {
      color: $insensitive_fg_color;
    }

    //submenu indicators
    arrow {
      min-height: 16px;
      min-width: 16px;

      &:dir(ltr) {
        -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
        margin-left: 10px;
      }
      &:dir(rtl) {
        -gtk-icon-source:-gtk-icontheme('pan-end-symbolic-rtl');
        margin-right: 10px;
      }
    }
    @at-root menuitem {
      accelerator { color: gtkalpha(currentColor,0.55); }

      check, radio {
        min-height: 16px;
        min-width: 16px;
        &:dir(ltr) { margin-right: 7px; }
        &:dir(rtl) { margin-left: 7px; }
      }
    }
  }
  arrow { // overflow buttons
    @extend %undecorated_button;
    border-style: none;
    border-radius: 0;
    min-width: 16px;
    min-height: 16px;

    &.top {
      -gtk-icon-source: -gtk-icontheme('pan-up-symbolic');
      border-bottom: 1px solid mix($fg_color, $base_color, 10%);
    }
    &.bottom {
      -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
      border-top: 1px solid mix($fg_color, $base_color, 10%);
    }
    &:hover { background-color: mix($fg_color, $base_color, 10%); }
    &:disabled {
      color: transparent;
      background-color: transparent;
      border-color: transparent ;
    }
  }
}

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

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

  .csd &, & { border: 1px solid darken($borders_color, 5%); }

  & separator { background-color: $_popover_bg; }
  label.separator { @extend label.separator; } // Noice

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

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

//touch selection handlebars for the Popover.osd above
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;
  transition: all 200ms $ease-out-quad;

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

    > header { margin: -1px; }  // ugly hack to hide the borders around the header
  }

  > stack:not(:only-child) { // the :not(:only-child) is for "hidden" notebooks
    background-color: $base_color;
  }

  > header {
    padding: 3px;
    background-color: $bg_color;

    &.top {    box-shadow: inset  0  -1px $borders_color; }
    &.bottom { box-shadow: inset  0   1px $borders_color; }
    &.right {  box-shadow: inset  1px 0   $borders_color; }
    &.left {   box-shadow: inset -1px 0   $borders_color; }

  @each $_pos, $_bpos in (top, bottom), (bottom, top), (right, left), (left, right) {
      // sizing and borders
      &.#{$_pos} {
        padding-#{$_bpos}: 0;

        > tabs > tab {
          padding: 2px 10px;
          min-width: 22px;
          min-height: 22px;

          outline-offset: -4px;

          border: 1px solid transparent;
          border-#{$_bpos}: none;

          // tab overlap
          @if $_pos==top or $_pos==bottom { margin-right: -1px; }
          @else { margin-bottom: -1px; }

          // tab border radius
          @if $_pos==top { border-radius: 1px 1px 0 0; }
          @else if $_pos==bottom { border-radius: 0 0 1px 1px; }
          @else if $_pos==left { border-radius: 1px 0 0 1px; }
          @else if $_pos==right { border-radius: 0 1px 1px 0; }
        }
      }
    }
    // overflow arrows
    &.top, &.bottom {
      > tabs > arrow.up {
        -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
        &:last-child { margin-left: 2px; }
      }
      > tabs > arrow.down {
        -gtk-icon-source: -gtk-icontheme('pan-start-symbolic');
        &:first-child { margin-right: 2px; }
      }
    }
    &.left, &.right {
      > tabs > arrow.up {
        -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
        &:last-child { margin-top: 2px; }
      }
      > tabs > arrow.down {
        -gtk-icon-source: -gtk-icontheme('pan-up-symbolic');
        &:first-child { margin-bottom: 2px; }
      }
    }
    > tabs > arrow {
      color: $insensitive_fg_color;

      &:hover { color: mix($fg_color, $insensitive_fg_color, 50%); }
      &:active { color: $fg_color; }
      &:disabled { color: transparentize($insensitive_fg_color,0.3); }
    }
    // tab colors
    > tabs > tab {
      color: $insensitive_fg_color;
      background-color: transparentize($base_color, 1);

      &:hover:not(:checked) {
        color: mix($fg_color, $insensitive_fg_color, 50%);
        background-color: transparentize($base_color, 0.5);
        border-color: $borders_color;
        box-shadow: inset 0 -1px $borders_color;
      }
      &:checked {
        color: $fg_color;
        background-color: $base_color;
        border-color: $borders_color;
      }
      // close button
      button.flat {
        min-height: 18px;
        min-width: 16px;
        padding: 0;
        color: mix($bg_color, $fg_color, 35%);

        &:hover {
          @extend %undecorated_button;
          color: lighten(red, 15%);
        }
        &:active, &:active:hover {
          @extend %undecorated_button;
          color: $selected_bg_color;
        }
      }
    }
  }
}

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

scrollbar {
  @at-root * {
    -GtkScrollbar-has-backward-stepper: false;
    -GtkScrollbar-has-forward-stepper: false;
  }

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

  button { border: none; }

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

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

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

      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;
      }

      &.vertical slider {
        min-width: 4px;
        margin-top: $_slider_margin - 1px;
        margin-bottom: $_slider_margin - 1px;
      }

      &.horizontal slider {
        min-height: 4px;
        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%); }

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

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

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

  &.vertical {

    &.fine-tune slider {
      min-width: 4px;
      margin: $_slider_fine_tune_margin;
    }

    slider {
      min-height: 42px;
      min-width: 6px;
      margin: $_slider_margin;
    }

    trough {
      &:dir(ltr) { border-left-style: solid; }
      &:dir(rtl) { border-right-style: solid; }
    }
  }

  &.horizontal {

    &.fine-tune slider {
      min-height: 4px;
      margin: $_slider_fine_tune_margin;
    }

    slider {
      min-height: 6px;
      min-width: 42px;
      margin-top: $_slider_margin;
    }

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

//
// Switches
//
switch {
  font: 1;
  outline-color: transparent;

  &, 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; }
  }
  slider {
    min-width: 52px;
    min-height: 24px;
  }
}

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

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

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

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

  headerbar switch#{$k},
  .primary-toolbar switch#{$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'),
                  (':disabled','-unchecked-insensitive'),
                  (':indeterminate', '-mixed'),
                  (':indeterminate:disabled', '-mixed-insensitive'),
                  (':checked', '-checked'),
                  (':checked:disabled','-checked-insensitive') {
    #{$w}#{$s},
    treeview.#{$w}#{$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.
    .view #{$w}#{$s}:selected,
    treeview.#{$w}#{$s}:selected,
    row:selected #{$w}#{$s},
    infobar #{$w}#{$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;
  }
}

checkbutton, radiobutton {
    // this is for a nice focus on check and radios text
    &.text-button {
    padding: 1px 2px 4px;
    outline-offset: 0;

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

radiobutton radio,
checkbutton check {
  min-width: 16px;
  min-height: 16px;
  margin: 0 2px;
  &:only-child { margin: 0; }
}

//
// GtkScale
//
scale {
  $_marks_length: 3px;
  $_marks_margin: -4px;

  min-height: 9px;
  min-width: 9px;
  padding: 5px;

  marks {
    color: gtkalpha(currentColor, 0.4);

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

  &.horizontal indicator {
    min-height: $_marks_length;
    min-width: 1px;
  }
  &.vertical indicator {
    min-height: 1px;
    min-width: $_marks_length;
  }

  &.fine-tune {
    padding: 3px;

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

    slider { margin: -4px; }
  }

  trough, fill, highlight {
    border-radius: 2.5px;
  }

  slider {
    $_slider_border: if($variant=='light', transparentize(darken($button_border,25%), 0.5), darken($button_border,2%));

    min-width: 15px;
    min-height: 15px;
    margin: -6px;
    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: $_slider_border;
    }
    &:disabled {
      background-image: linear-gradient(to bottom, mix($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
    row:selected &,
    infobar & {
      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, $selected_bg_color, 50%);
      }
      &:disabled{
        background-image: linear-gradient(to bottom, mix($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%));

    outline-offset: 2px;
    -gtk-outline-radius: 2px;
    margin: 5px;
    border: none;
    background-image: linear-gradient(to bottom, $_scale_trough_bg);
    highlight {
      background-image: linear-gradient(to bottom, $selected_bg_color);

      &:disabled {
        background-image: linear-gradient(to bottom, transparentize($selected_bg_color, 0.45));
      }
    }
    fill {
      background: none;
      background-color: red;
    }
    &:disabled {
      background-image: linear-gradient(to bottom, transparentize($_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);
      }
      &:disabled {  }
    }
    // troughs in selected list-rows and infobars
    row:selected &,
    infobar & {
      background-image: linear-gradient(to bottom, transparentize(black, 0.8));

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

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

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

  &.osd {
    min-width: 3px;
    min-height: 3px;
    background-color: transparent;

    trough {
      border-style: none;
      background-color: transparent;
      box-shadow: none;
    }
  }
  // Moving bit
  progress {
    background-color: $selected_bg_color;
    border: none;
    border-radius: 3px;
    box-shadow: none; //needed for clipping

    row:selected &,
    infobar & { background-color: $selected_fg_color; }
  }
  // Trough
  trough {
    border: none;
    border-radius: 3px;
    background-color: if($variant == 'light', $button_border, darken($bg_color, 5%));

    row:selected &,
    infobar & { background-color: transparentize(black, 0.8); }
  }
}

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

//
// Level Bar
//
levelbar {
  block {
    min-width: 32px;
    min-height: 1px;
  }
  &.vertical block {
    min-width: 1px;
    min-height: 32px;
  }

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

  &.horizontal.discrete block { margin: 0 1px; }
  &.vertical.discrete block { margin: 1px 0; }

  block:not(.empty) {
    border: 1px solid $selected_bg_color;
    background-color: $selected_bg_color;
    border-radius: 2px;
  }
  block.low {
    border-color: $warning_color;
    background-color: $warning_color;
  }
  block.high {
    border-color: $selected_bg_color;
    background-color: $selected_bg_color;
  }
  block.full {
    border-color: $success_color;
    background-color: $success_color;
  }
  block.empty {
    background-color: if($variant=='light', transparentize($fg_color,0.8), $base_color);
    border-color: if($variant=='light', transparentize($fg_color,0.8), $base_color);
  }
}

//
// Print dialog
//
printdialog {
  paper {
    border: 1px solid $borders_color;
    background: white;
    padding: 0;
  }

  .dialog-action-box { margin: 12px; }
}

//
// Frames
//
frame border,
.frame {
  margin: 0;
  padding: 0;
  border-radius: 0;
  border: 1px solid $borders_color;
  &.flat { border-style: none; }
  padding: 0;
}

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

  // 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); }
  }

  // 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); }
  }

  junction { // 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; }
  }
}

//vbox and hbox separators
separator {
  background-color: transparentize(black, 0.9);
  min-width: 1px;
  min-height: 1px;
}

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

  row { padding: 2px; }
}

row.activatable {
  &.has-open-popup,
  &:hover { background-color: if($variant == 'light', transparentize(black, 0.95), transparentize(white, 0.97)); }

  &:active { color: $fg_color; }

  &:selected {
    &:active { color: $selected_fg_color; }

    &.has-open-popup,
    &:hover { background-color: mix(black, $selected_bg_color, 10%); }

    &:disabled {
      color: transparentize($selected_fg_color, 0.3);
      background-color: transparentize($selected_bg_color, 0.3);
      label { color: inherit; }
    }
  }
}

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

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

//
// App Notifications
//
.app-notification {
  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%);

  border { border: none; }

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

//
// 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 {
  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;
    }
    &:disabled {
      color: $insensitive_fg_color;
      background-color: transparent;
      background-image: none;
    }
  }
  &:indeterminate { color: gtkalpha(currentColor,0.55); }
  &.highlight {
    color: $fg_color;
  }
}

//
// Dialogs
//
messagedialog { // Message Dialog styling

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

  .dialog-action-area button { padding: 8px; min-height: 0; }

  &.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 {
      border-bottom-style: none;

      @extend %middle_button;
      &:first-child{ @extend %first_button; }
      &:last-child { @extend %last_button; }
      &:only-child { @extend %single_button; }
    }
    %middle_button {
      border-radius: 0;
      border-right-style: none;
    }
    %last_button {
      border-radius: 0 0 3px 0;
      border-right-style: none;
    }
    %first_button {
      border-radius: 0 0 0 3px;
      border-left-style: none;
    }
    %single_button {
      border-radius: 0 0 3px 3px;
      border-left-style: none;
      border-right-style: none;
    }
  }
}

//
// Filechooser
//
filechooser {
  #pathbarbox { border-bottom: 1px solid transparentize($borders_color, 0.5); }
}

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

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

stacksidebar {
  row {
    padding: 10px 4px;

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

placessidebar {

  @extend scrolledwindow;

  list { background-color: transparent; }

  row {
    // Needs overriding of the GtkListBoxRow padding
    min-height: 30px;
    padding: 0px;
    // Using margins/padding directly in the SidebarRow
    // will make the animation of the new bookmark row jump
    > revealer {
      padding: 0 10px;
    }
    image.sidebar-icon {
      &: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 {
      min-width: 22px;
      min-height: 22px;
      margin-top: 2px;
      margin-bottom: 2px;
      padding: 0;
      @extend button.flat;
      border-radius: 100%;
      -gtk-outline-radius: 100%;

      &:not(:hover):not(:active) > image { opacity: 0.5 };
    }
  }

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

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

//
// Placesview
//
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);
  }
}

//
// Paned
//
paned {
  > separator {
    min-width: 1px;
    min-height: 1px;
    -gtk-icon-source: none;
    border-style: none;
    background-color: transparent;
    background-image: linear-gradient(to top, $borders_color);
    background-size: 1px 1px;

    &:selected { background-image: linear-gradient(to top, $selected_bg_color); }

    &.wide {
      margin: 0;
      padding: 0;
      min-width: 5px;
      min-height: 5px;
      background-image: linear-gradient(to top, $borders_color), linear-gradient(to top, $borders_color);
      background-size: 1px 1px, 1px 1px;
    }
  }

  &.horizontal > separator {
    background-repeat: repeat-y;
    &:dir(ltr) {
      margin: 0 -8px 0 0;
      padding: 0 8px 0 0;
      background-position: left;
    }
    &:dir(rtl) {
      margin: 0 0 0 -8px;
      padding: 0 0 0 8px;
      background-position: right;
    }

    &.wide {
      background-repeat: repeat-y, repeat-y;
      background-position: left, right;
    }
  }

  &.vertical > separator {
    margin: 0 0 -8px 0;
    padding: 0 0 8px 0;
    background-repeat: repeat-x;
    background-position: top;

    &.wide {
      background-repeat: repeat-x, repeat-x;
      background-position: bottom, top;
    }
  }
}

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

  button { @extend %selected-button }
}

.info,
.question,
.warning,
.error,
infobar {
  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: $selected_fg_color;
  }
  &:disabled {
    color: transparentize($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: $osd_bg_color;
    background-clip: padding-box;
  }

  border-radius: 2px;
  box-shadow: none;

  decoration { background-color: transparent; }

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

//
// Color Chooser
//
colorswatch {
  // 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.

  $_colorswatch-radius: 2px;

  &, &:drop(active) { border-style: none; }

  // border rounding
  &.top {
    border-top-left-radius: $_colorswatch-radius + 0.5px;
    border-top-right-radius: $_colorswatch-radius + 0.5;

    overlay {
      border-top-left-radius: $_colorswatch-radius;
      border-top-right-radius: $_colorswatch-radius;
    }
  }
  &.bottom {
    border-bottom-left-radius: $_colorswatch-radius + 0.5px;
    border-bottom-right-radius: $_colorswatch-radius + 0.5;

    overlay {
      border-bottom-left-radius: $_colorswatch-radius;
      border-bottom-right-radius: $_colorswatch-radius;
    }
  }
  &.left, &:first-child:not(.top) {
    border-top-left-radius: $_colorswatch_radius + 0.5px;
    border-bottom-left-radius: $_colorswatch_radius + 0.5px;
    overlay {
      border-top-left-radius: $_colorswatch_radius;
      border-bottom-left-radius: $_colorswatch_radius;
    }
  }
  &.right, &:last-child:not(.bottom) {
    border-top-right-radius: $_colorswatch_radius + 0.5px;
    border-bottom-right-radius: $_colorswatch_radius + 0.5px;
    overlay {
      border-top-right-radius: $_colorswatch_radius;
      border-bottom-right-radius: $_colorswatch_radius;
    }
  }

  &.dark overlay {
    color: transparentize(white, 0.3);
    &:hover {
      border-color: if($variant == 'light', transparentize(black, 0.5), $borders_color);
    }
  }
  &.light overlay {
    color: transparentize(black, 0.3);
    &:hover {
      border-color: if($variant == 'light', transparentize(black, 0.7), $borders_color);
    }
  }

  overlay {
    border: 1px solid if($variant == 'light', transparentize(black, 0.85), $borders_color);
    &:hover { background-color: transparentize(white, 0.8) }
  }

  &:disabled {
    opacity: 0.5;
    overlay {
      border-color: transparentize(black, 0.4);
      box-shadow: none;
    }
  }

  &#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
  }
}

button.color {
  padding: 0;

  colorswatch:first-child:last-child {
    &, overlay {
      margin: 4px;
      border-radius: 0;
    }
  }
}

//
// Misc
//
//content view (grid/list)
.content-view {
  background-color: $base_color;

  &:hover { -gtk-icon-effect: highlight; }

  rubberband { @extend rubberband; }
}

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

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

//
// Shortcuts Help
//
button.circular,
button.circular-button {
  padding: 0;
  min-width: 26px;
  min-height: 26px;
  border-radius: 50%;
  -gtk-outline-radius: 50%;

  label { padding: 0; }
}

.keycap {
  min-width: 16px;
  min-height: 20px;

  padding: 3px 6px 4px 6px;

  color: $fg_color;
  background-color: $base_color;
  border: 1px solid $borders_color;
  border-radius: 2.5px;
  box-shadow: inset 0px -2px 0px if($variant=='light', transparentize(black, 0.95), transparentize(black, 0.85));
}

stackswitcher button {
  &.text-button { min-width: 80px; }
  &.circular { min-width: 0; }
}

//
// Dnd
//
*:drop(active):focus,
*:drop(active) {
  border-color: black;
  box-shadow: inset 0 0 0 1px black;
}

//
// Window Decorations
//

decoration {
  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 {
    // the transparent shadow here is to enforce that the shadow extents don't
    // change when we go to backdrop, to prevent jumping windows
    box-shadow: 0 0 0 1px if($darker=='true' or $variant == 'dark', transparentize(darken($header_bg, 7%), 0.1), $_wm_border),
                0 8px 8px 0 transparent,
                0 5px 5px 0 if($variant == 'light', opacify($_wm_border, 0.1), transparentize($_wm_border, 0.2));
  }
  .fullscreen &,
  .tiled & {
    border-radius: 0;
  }
  .popup &,
  &.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.csd & {
    border-radius: 2px;
    box-shadow: 0 1px 3px 1px $_wm_border;
  }
  messagedialog.csd & {
    border-radius: 3px;
  }
  .solid-csd & {
    border-radius: 0;
    margin: 1px;
    background-color: $header_bg;
    box-shadow: none;
  }
}

//
// Titlebuttons
//
headerbar,
.titlebar {

  &.default-decoration button.titlebutton { // no vertical padding for ssd buttons
    padding: 0 4px;                        // already handled by the titlebar-padding
    min-width: 0;
  }

  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','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')); }
      }
    }
  }
}

// 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);
}