@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

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

  -GtkScrolledWindow-scrollbar-spacing: 0;

  -GtkToolItemGroup-expander-size: 11;

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

  -GtkDialog-button-spacing: 4;
  -GtkDialog-action-area-border: 6;

  // 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: $fg_color;
  background-color: transparentize($bg_color, 0.001);
}

*: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,
%view {
  color: $text_color;
  background-color: $base_color;

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

.view,
textview {
  text {
    @extend %view;

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

textview border { background-color: mix($bg_color, $base_color, 50%); }

iconview { @extend .view; }

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 {
      @extend %selected_items;

      outline-offset: -2px;
    }
  }
}

label {
  &.separator {
    @extend .dim-label;

    color: $fg_color;
  }

  row:selected &,
  &:selected {
    @extend %nobg_selected_items;
  }

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

  &:disabled {
    color: $insensitive_fg_color;

    selection { @extend %selected_items_disabled; }
  }
}

.dim-label {
  color: $dim_label_fg_color;
}

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;
  }
}

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

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

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

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

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

    &:disabled {
      opacity: 0.5;
    }
  }
}

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

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

  &.search { border-radius: 4px; }

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

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

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

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

  @each $e_type, $e_color, $e_fg_color in (warning, $warning_color, $warning_fg_color),
                                          (error, $error_color, $error_fg_color),
                                          // entry.search-missing for Gnome-Builder
                                          (search-missing, $error_color, $error_fg_color) {
    &.#{$e_type} {
      color: $e_fg_color;
      border-color: if($variant=='light', $e_color, $entry_border);
      background-color: mix($e_color, $base_color, 60%);

      image { color: $e_fg_color; }

      &:focus {
        color: $e_fg_color;
        background-color: $e_color;
        box-shadow: none;
      }
      selection, selection:focus {
        background-color: $e_fg_color;
        color: $e_color;
      }
    }
  }

  &:drop(active) {
    &:focus, & {
      border-color: $drop_target_color;
      box-shadow: none;
    }
  }

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

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

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

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

treeview entry {
  &.flat, & {
    border-radius: 0;
    background-image: none;
    background-color: $base_color;

    &:focus { border-color: $selected_bg_color; }
  }
}

//
// 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_transition: all 200ms $ease-out-quad;

button {
  min-height: 22px;
  min-width: 20px;
  transition: $button_transition;
  border: 1px solid;
  border-radius: 3px;
  padding: 5px 8px;

  @include button(normal);

  separator { margin: 4px 1px; }

  @at-root %button_basic_flat,
  &.flat {
    @include button(undecorated);
    // to avoid adiacent buttons borders clashing when transitioning, the transition on the normal state is set
    // to none, while it's added back in the hover state, so the button decoration will fade in on hover, but
    // it won't fade out when the pointer leave the button allocation area. To make the transition more evident
    // in this case the duration is increased.
    transition: none;

    &:hover {
      transition: $button_transition;
      transition-duration: 350ms;

      &:active { transition: $button_transition; }
    }
  }

  &:hover {
    @include button(hover);
    -gtk-icon-effect: highlight;
  }

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

    background-clip: if($variant=='light', border-box, padding-box);
    transition-duration: 50ms;

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

  @at-root %button_basic_flat,
  &.flat:disabled { @include button(undecorated); }

  &:disabled {
    @include button(insensitive);

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

  &.image-button {
    min-width: 24px;
    padding-left: 5px;
    padding-right: 5px;
  }

  &.text-button {
    padding-left: 12px;
    padding-right: 12px;
  }

  &.text-button.image-button {
    padding-left: 5px;
    padding-right: 5px;

    label {
      &:first-child {
        padding-left: 8px;
        padding-right: 2px;
      }
      &:last-child {
        padding-right: 8px;
        padding-left: 2px;
      }
      &:only-child {
        padding-left: 8px;
        padding-right: 8px;
      }
    }

    &.popup { padding-right: 8px; padding-left: 8px; }
  }

  @at-root %button_basic_drop_active,
  &:drop(active) {
    color: $drop_target_color;
    border-color: $drop_target_color;
    box-shadow: none;
  }

  // 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: 0;
      min-height: 36px;
      min-width: 36px;
    }

    &: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); }
    }
  }

  .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, > image { @extend %needs_attention; }

      &:active, &:checked {
        > label, > 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; }
    }
  }

  // hide separators
  &.font,
  &.file { separator { background-color: transparent; }}

  //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_left; }
  &:last-child > button.flat { @extend %linked_right; }
  &:only-child > button.flat { @extend %linked_only_child; }
}

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

%linked_left {
  border-top-left-radius: 3px;
  border-bottom-left-radius: 3px;
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

%linked_right {
  border-top-right-radius: 3px;
  border-bottom-right-radius: 3px;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  border-right-style: solid;
}

%linked_only_child {
  border-radius: 3px;
  border-style: solid;
}

%linked {
  @extend %linked_middle;

  &:first-child { @extend %linked_left; }
  &:last-child { @extend %linked_right; }
  &:only-child { @extend %linked_only_child; }
}

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

%linked_vertical_top {
  border-top-left-radius: 3px;
  border-top-right-radius: 3px;
}

%linked_vertical_bottom {
  border-bottom-left-radius: 3px;
  border-bottom-right-radius: 3px;
  border-bottom-style: solid;
}

%linked_vertical_only_child {
  border-radius: 3px;
  border-style: solid;
}

%linked_vertical {
  @extend %linked_vertical_middle;

  &:first-child { @extend %linked_vertical_top; }
  &:last-child { @extend %linked_vertical_bottom; }
  &:only-child { @extend %linked_vertical_only_child; }
}

%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: 24px;
  padding-left: 8px;
  padding-right: 8px;
  outline-offset: -3px;
  border-radius: 2px;

  @extend %undecorated_button;

  &:hover { background-color: $menu_selected_bg_color; }
  &:active, &:selected { &, arrow { background-color: $menu_selected_bg_color; } }
  &: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 {
  &.left { -gtk-icon-source: -gtk-icontheme("pan-start-symbolic"); }
  &.right { -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); }
}

//
// Links
//
%link,
*: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%); }
  }

  @at-root %link_selected,
  &: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 {
  &:drop(active) { box-shadow: none; }

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

  &:not(.vertical) {
    entry { min-width: 28px; }

    button, entry { @extend %linked; }

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

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

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

    > button:disabled + button:not(:disabled):not(:active):not(:checked):not(:hover),
    > button:not(:disabled):not(:active):not(:checked):not(:hover) + button:disabled { box-shadow: inset 1px 0 transparentize($button_border, 0.5); }

    > 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); }

    > entry:drop(active) + button { border-left-color: $drop_target_color; }

    .osd & {
      > button:hover:not(:active),
      > button:hover + button { box-shadow: inset 1px 0 $osd_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: $osd_button_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); }

    > entry:drop(active) + button { border-top-color: $drop_target_color; }
  }
}

//
// Comboboxes
//
combobox {
  button.combo {                   // Otherwise combos
    padding-top: 3px;               // are bigger than
    padding-bottom: 3px;            // buttons
  }
  arrow {
    -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
    min-height: 16px;
    min-width: 16px;
  }

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

  .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; }
  }

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

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 & { background-color: transparent; }

  &.osd {
    padding: 7px;
    border: 1px solid transparentize(black, 0.5);
    border-radius: 3px;
    background-color: transparentize($osd_bg_color, 0.1);

    &.left,
    &.right,
    &.top,
    &.bottom { border-radius: 0; } // positional classes for `attached` osd toolbars

    &.top { border-width: 0 0 1px 0; }
    &.bottom { border-width: 1px 0 0 0; }
    &.left { border-width: 0 1px 0 0; }
    &.right { border-width: 0 0 0 1px; }
  }

  &:not(.inline-toolbar) {
    switch,
    scale,
    entry,
    spinbutton,
    button {
      margin-right: 1px;
      margin-bottom: 1px;
    }
    .linked > button,
    .linked > entry { margin-right:0; }
  }
}

.primary-toolbar toolbar,
.primary-toolbar:not(.libreoffice-toolbar) {  // LO messes up the toolbar styling, so exclude LO toolbars
  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, 12%)) 1 0 1 0; //temporary hack for rhythmbox 3.1

  separator { @extend %header_separator; }
}

.primary-toolbar toolbar,
.primary-toolbar { @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;
  //box-shadow: inset 0 1px 2px rgba(0,0,0,0.25);
}

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

//
// Headerbars
//
headerbar,
%titlebar {
  min-height: 42px;
  padding: 0 7px;

  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);
  box-shadow: inset 0 1px $header_highlight;

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

  &:backdrop {
    color: transparentize($header_fg, 0.4);
    box-shadow: none;
  }

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

  .subtitle {
    font-size: smaller;
    padding-left: 12px;
    padding-right: 12px;
  }

  // Selectionmode
  &.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 {
    min-height: 28px;
    padding: 0 7px;
    background-color: opacify($header_bg, 1);
    border-bottom-width: 0;

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

.titlebar {
  border-radius: 8px 8px 0 0;
}

headerbar {
  @extend %header_widgets;

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

  // Fixes split headerbars
  separator:first-child + &,
  &:first-child {
    &, &:backdrop {
      border-top-left-radius: 8px;

      .maximized &,
      .tiled & { border-radius: 0; }
    }
  }

  &:last-child {
    &, &:backdrop {
      border-top-right-radius: 8px;

      .maximized &,
      .tiled & { border-radius: 0; }
    }
  }
}

// Fixes split headerbars too
.titlebar:not(headerbar) {
  window > &,
  window.csd > & {
    &, &:backdrop {
      padding: 0;
      background: none;
      border: none;
      box-shadow: none;
    }
  }

  > separator { background-image: _solid($header_border); }

  @extend %titlebar;
}

%header_separator {
  min-width: 1px;
  min-height: 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($variant=='light', border-box, padding-box);

      image { color: transparentize($header_fg, 0.15); }
    }
    &:disabled { @include entry(header-insensitive); }

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

    progress {
      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: $e_fg_color;
        border-color: if($variant=='light', $e_color, $header_entry_border);
        background-color: mix($e_color, $header_bg, 60%);

        &:focus {
          color: $e_fg_color;
          background-color: $e_color;
        }
        selection, selection: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($variant=='light', border-box, padding-box);
    }
    &:disabled { @include button(header-insensitive); }
    &:disabled:active, &:disabled:checked { @include button(header-insensitive-active); }
  }

  &.selection-mode button {

    &, &.flat {
      @include button(undecorated);
      color: $selection_mode_fg;
      background-color: transparentize($selection_mode_fg, 1);
    }
    &:hover { @extend %selected_button_normal; }
    &:active, &:checked { @extend %selected_button_active; }

    &:disabled {
      @extend %selected_button_flat_disabled;

      &:checked, &:active { @extend %selected_button_disabled_checked; }
    }
  }

  // Linking stuff

  // Disconnect linked buttons
  .linked:not(.vertical):not(.path-bar):not(.stack-switcher) {
    button:not(:last-child):not(:only-child) { margin-right: 1px; }
  }

  // Reset buttons
  .linked:not(.vertical):not(.path-bar) > button {
    &, &:hover, &:active, &:checked, &:disabled {
      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)';

    > #{$_uncolored_button} + #{$_uncolored_button},
    > #{$_uncolored_button}:hover:not(:only-child),
    > #{$_uncolored_button}:hover + #{$_uncolored_button},
    > #{$_uncolored_button}:disabled:not(:only-child),
    > #{$_uncolored_button}:disabled + #{$_uncolored_button}:not(:hover) { 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; }
    }
  }

  // special case widgets like the linked entry and button in mintinstall toolbar
  .linked:not(.vertical) entry {
    box-shadow: none;

    &:focus {
      @include entry(header-normal);
      background-clip: padding-box;
    }

    & + button:last-child {
      @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);
          background-color: transparentize($header_button_bg, 0.2);
          border-color: $header_button_border;

          &:checked {
            background-color: transparentize($selected_bg_color, 0.35);
            color: transparentize($selected_fg_color, 0.25);
          }
        }

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

  // 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 {

    &:focus button {
      color: $selected_fg_color;

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

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

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

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

      &:hover { @include entry(header-focus); box-shadow: none; }
      &:disabled { @include entry(header-insensitive); }
    }

    > .linked > entry.combo {
      &:dir(ltr) {
        border-right-style: none;

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

        &:focus { box-shadow: none; }
        @if $variant=='light' { &: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($variant=='light', opacify($header_button_border, 0.05), $header_button_border); }

    &:backdrop { opacity: 0.75; }
  }

  // Headerbar Scale
  scale {
    $_trough_bg: if($variant=='light', opacify($header_button_border, 0.05), $header_button_border);

    &:backdrop { opacity: 0.75; }

    slider {
      $_slider_border: if($variant=='light', opacify($header_button_border, 0.2), opacify($header_button_border, 0.3));
      $_slider_bg: if($variant=='light', opacify($header_button_bg,1), lighten(opacify($header_bg,1), 10%));

      background-color: $_slider_bg;
      border-color: $_slider_border;

      &:hover {
        background-color: lighten($_slider_bg, 5%);
        border-color: $_slider_border;
      }
      &:active {
        background-color: $selected_bg_color;
        border-color: $selected_bg_color;
      }
      &:disabled {
        background-color: mix($_slider_bg, $header_bg, 70%);
        border-color: $_slider_border;
      }
    }
    trough {
      background-color: $_trough_bg;

      &:disabled { background-color: if($variant=='light', transparentize($_trough_bg, 0.05), transparentize($_trough_bg, 0.1)); }
    }
  }
}

//
// Pathbars
//
.path-bar button {
  &.text-button, &.image-button, & {
    padding-left: 6px;
    padding-right: 6px;
  }

  &.text-button.image-button label { padding-left: 0; padding-right: 0; }

  &.text-button.image-button, & {
    label:last-child { padding-right: 10px; }
    label:first-child { padding-left: 10px; }
  }

  &.slider-button,
  &:not(.image-button):not(.text-button) {
    padding-left: 1px;
    padding-right: 1px;
  }

  image {
    padding-left: 4px;
    padding-right: 4px;
  }
}

//
// Tree Views
//
treeview.view {
  @at-root * {
    -GtkTreeView-horizontal-separator: 4;
    -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

  acceleditor > label { background-color: $selected_bg_color; }

  &:selected {
    &, &:focus {
      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

      @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);
  }

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

    &.after { border-top-style: none; }
    &.before { border-bottom-style: none; }
  }

  &.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: 2px;
    background-color: $selected_bg_color;

    &:selected, &:selected:focus {
      color: $selected_bg_color;
      box-shadow: none;
      background-color: $selected_fg_color;
    }
  }
  &.trough { // progress bar trough in treeviews
    color: $fg_color;
    background-color: $trough_color_treeview;
    border-radius: 2px;
    border: 1px solid $button_border;

    &:selected, &:selected:focus {
      color: $selected_fg_color;
      background-color: transparentize(black, 0.8);
      border-radius: 2px;
      border-width: 0;
    }
  }

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

      padding: 3px 6px;
      font-weight: bold;

      color: $_column_header_color;
      background-color: darken($bg_color, 1%);
      background-image: none;
      border-style: none solid solid none;
      border-radius: 0;
      border-color: $borders_color;

      &:active, &:hover { background-color: lighten($bg_color, 2%); }
      &:active:hover { color: $fg_color; }
      &:disabled {
        border-color: $bg_color;
        background-image: none;
      }
      &:last-child {
        border-right-style: none;
      }
    }
  }

  button.dnd,
  header.button.dnd {
    &, &:selected, &:hover, &:active {
      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;
    }
  }
}

//
// 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: $menu_selected_bg_color;
      color: $fg_color;
    }
    &:disabled {
      color: transparentize($header_fg, 0.6);
      border-color: transparent;
    }

    > label:disabled { color: transparentize($header_fg, 0.45); }
  }
}

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: $separator_color;
  }

  // Firefox workaround
  .separator:not(label),
  .csd & .separator:not(label) { color: $_menu_bg; }
  // Firefox workaround end

  menuitem {
    min-height: 16px;
    min-width: 40px;
    padding: 5px;

    &:hover {
      color: $fg_color;
      background-color: $menu_selected_bg_color;
    }
    &: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: 6px; margin-left: 2px; }
        &:dir(rtl) { margin-left: 6px; margin-right: 2px; }
      }
    }
  }

  // overflow buttons
  > arrow {
    @include button(undecorated);
    min-width: 16px;
    min-height: 16px;
    padding: 4px;
    background-color: $_menu_bg;
    border-radius: 0;

    &.top {
      margin-top: -6px;
      border-bottom: 1px solid mix($fg_color, $base_color, 10%);
      -gtk-icon-source: -gtk-icontheme('pan-up-symbolic');
    }
    &.bottom {
      margin-bottom: -6px;
      border-top: 1px solid mix($fg_color, $base_color, 10%);
      -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
    }
    &:hover { background-color: mix($fg_color, $base_color, 10%); }
    &:disabled {
      color: transparent;
      background-color: transparent;
      border-color: transparent ;
    }
  }
}

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

//
// Popovers
//
popover,
popover.background {
  $_popover_bg: if($variant=='light', $base_color, $bg_color);
  padding: 2px;
  // border: 1px solid darken($borders_color, 5%);
  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 .dim-label;

    color: $fg_color;
  }

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

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

    &.osd { @extend %osd; }
  }
}

//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;

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

    > header {
      // ugly hack to hide the borders around the header
      margin: -1px;
      &.top { margin-bottom: 0; }
      &.bottom { margin-top: 0; }
      &.left { margin-right: 0; }
      &.right { margin-left: 0; }

      &.top, &.bottom { padding-left: 0; padding-right: 0; }
      &.left, &.right { padding-top: 0; padding-bottom: 0; }
    }
  }

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

  > header {
    padding: 2px;
    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: 20px;
          min-height: 20px;

          outline-offset: -4px;

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

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

    &.top > tabs > tab:hover:not(:checked) { box-shadow: inset 0 -1px $borders_color; }
    &.bottom > tabs > tab:hover:not(:checked) { box-shadow: inset 0 1px $borders_color; }
    &.left > tabs > tab:hover:not(:checked) { box-shadow: inset -1px 0 $borders_color; }
    &.right > tabs > tab:hover:not(:checked) { box-shadow: inset 1px 0 $borders_color; }

    > 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;
      }
      &:checked {
        color: $fg_color;
        background-color: $base_color;
        border-color: $borders_color;
      }
      // close button
      button.flat {
        min-height: 22px;
        min-width: 16px;
        padding: 0;
        color: mix($bg_color, $fg_color, 35%);

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

    /* button in headers */
    button.flat { padding: 2px; }
  }
}

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

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

  $_slider_min_length: 40px;

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

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

  button { border: none; }

  // slider
  slider {
    min-width: 6px;
    min-height: 6px;
    margin: -1px;
    border: 4px solid transparent;
    border-radius: 8px;
    background-clip: padding-box;
    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; }
  }

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

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

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

      slider {
        margin: 0;
        min-width: 4px;
        min-height: 4px;
        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;
      }

      // w/o the following margin tweaks the slider shrinks when hovering/dragging
      &.vertical slider {
        margin: 2px 0;
        min-height: $_slider_min_length;
      }

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

    }

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

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

//
// Switches
//
switch {
  font-size: 1px;
  min-width: 52px;
  min-height: 24px;
  background-size: 52px 24px;
  background-repeat: no-repeat;
  background-position: center center;

  slider {
    min-width: 1px;
    min-height: 1px;
  }

  &, slider {
    outline-color: transparent;
    color: transparent;
    border: none;
    box-shadow: none;
  }
}

@each $k,$l in ('',''),
               (':checked','-active'),
               (':disabled','-insensitive'),
               (':checked: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"));
  }

  menuitem:hover switch#{$k},
  row:selected switch#{$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},
  .primary-toolbar toolbar switch#{$k} {
    background-image: -gtk-scaled(url("assets/switch#{$l}-header#{$asset_suffix}.png"),url("assets/switch#{$l}-header#{$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},
    #{$w}#{$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,
    %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: 2px 0;
      outline-offset: 0;
    }

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

check,
radio {
  min-width: 16px;
  min-height: 16px;
  margin: 0 2px;

  &:only-child,
  menu menuitem & { margin: 0; }
}

//
// GtkScale
//
scale {
  $_marks_length: 3px;
  $_marks_distance: 1px;

  min-height: 15px;
  min-width: 15px;
  padding: 3px;

  &.horizontal {
    trough { padding: 0 4px; }
    highlight, fill { margin: 0 -4px; }
  }

  &.vertical {
    trough { padding: 4px 0; }
    highlight, fill { margin: -4px 0; }
  }

  // The slider is inside the trough, negative margin to make it bigger
  slider {
    min-height: 15px;
    min-width: 15px;
    margin: -6px;
  }

  // Click-and-hold the slider to activate
  &.fine-tune {
    // Make the trough grow in fine-tune mode
    slider { margin: -4px; }

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

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

    background-clip: border-box;
    background-color: $button_bg;
    border: 1px solid $_slider_border;
    border-radius: 50%;
    box-shadow: none;

    &:disabled {
      background-color: mix($entry_bg, $bg_color, 55%);
      border-color: transparentize($_slider_border, 0.2);
    }
    &:active {
      background-color: $selected_bg_color;
      border-color: $selected_bg_color;
    }
    //OSD sliders
    .osd & {
      background-color: $osd_bg_color;
      border-color: $selected_bg_color;

      &:hover { background-color: $selected_bg_color; }
      &:active {
        background-color: darken($selected_bg_color, 10%);
        border-color: darken($selected_bg_color, 10%);
      }
    }
    //selected list-row and infobar sliders
    menuitem:hover &,
    row:selected &,
    infobar & {
      background-color: $selected_fg_color;
      border-color: $selected_fg_color;

      &:hover {
        background-color: mix($selected_fg_color, $selected_bg_color, 85%);
        border-color: mix($selected_fg_color, $selected_bg_color, 85%);
      }
      &:active {
        background-color: mix($selected_fg_color, $selected_bg_color, 50%);
        border-color: mix($selected_fg_color, $selected_bg_color, 50%);
      }
      &:disabled {
        background-color: mix($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: 4.5px;

    border-radius: 2.5px;
    background-color: $_scale_trough_bg;

    &:disabled {
      background-color: transparentize($_scale_trough_bg, 0.45);
    }

    //OSD troughs
    .osd & {
      background-color: lighten($osd_bg_color, 7%);
      outline-color: transparentize($osd_fg_color, 0.8);
      highlight {
        background-color: $selected_bg_color;
      }

      &:disabled {  }
    }
    // troughs in selected list-rows and infobars
    menuitem:hover &
    row:selected &,
    infobar & {
      background-color: transparentize(black, 0.8);

      highlight {
        background-color: $selected_fg_color;

        &:disabled { background-color: mix($selected_fg_color, $selected_bg_color, 55%); }
      }

      &:disabled { background-color: transparentize(black, 0.9); }
    }
  }

  // The colored part of the trough
  highlight {
    border-radius: 2.5px;
    background-color: $selected_bg_color;

    &:disabled {
      background-color: transparentize($selected_bg_color, 0.45);
    }
  }

  // this is another differently styled part of the trough, the most relevant use case is for example
  // in media player to indicate how much video stream as been cached
  fill {
    border-radius: 2.5px;
    background-color: transparentize($selected_bg_color, 0.5);

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

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

  marks {
    color: gtkalpha(currentColor, 0.4);

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

  &.fine-tune marks {
    @each $marks_class, $marks_pos, $marks_margin in (top, top, bottom),
                                                     (bottom, bottom, top),
                                                     (top, left, right),
                                                     (bottom, right, left) {
      &.#{$marks_class} {
        margin-#{$marks_margin}: ($_marks_distance - 1px);
        margin-#{$marks_pos}: -($_marks_distance + $_marks_length - 2px);
      }
    }
  }
  &.horizontal {
    indicator {
      min-height: $_marks_length;
      min-width: 1px;
    }

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

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

//
// 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-radius: 0px;
    box-shadow: none; //needed for clipping

    row:selected &,
    infobar & { background-color: $selected_fg_color; }
  }

  // Trough
  trough {
    border: 1px solid $button_border;
    border-radius: 2px;
    background-color: $trough_color;

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

// Needed by the Mate osd when Marco with compositing is enabled
.osd {
  .progressbar { background-color: $selected_bg_color; }
  .trough { background-color: lighten($osd_bg_color, 75%); }
}

//
// 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);
  }
}

frame > border,
.frame {
  margin: 0;
  padding: 0;
  border-radius: 0;
  border: 1px solid $borders_color;
}

frame.flat > border,
frame > border.flat,
.frame.flat {
  border-style: none;
}

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 {
  &:not(:hover) { transition: all 150ms $ease-out-quad; }

  &:selected {
    @extend %selected_items;

    button { @extend %selected_button; }
  }

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

    &:active { color: $fg_color; }
    &:disabled {
      color: $insensitive_fg_color;
      image { color: inherit; }
    }

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

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

//
// App Notifications
//
.app-notification {
  padding: 10px;
  color: $osd_fg_color;
  background-color: $osd_bg_color;
  background-clip: border-box;
  border-radius: 0 0 2px 2px;
  border-width: 0 1px 1px 1px;
  border-style: solid;
  border-color: darken($osd_bg_color, 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
//
.dialog-action-area .button.text-button {
  padding: 6px 16px;
}

.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, &:disabled {
        @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;
    }
  }
}

//
// FileChooser
//
filechooser {
  #pathbarbox {
    background-color: $filechooser_bg;
    border-bottom: 1px solid $borders_color;
  }

  .search-bar { background-color: $filechooser_bg; }

  actionbar { background-color: $bg_color; }
}

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

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

  @at-root %sidebar_left,
  &:dir(ltr),
  &.left,
  &.left:dir(rtl) {
    border-right: 1px solid $borders_color;
    border-left-style: none;
  }

  @at-root %sidebar_right,
  &:dir(rtl),
  &.right {
    border-left: 1px solid $borders_color;
    border-right-style: none;
  }

  list { background-color: $base_color; }

  paned & { &.left, &.right, &.left:dir(rtl), &:dir(rtl), &:dir(ltr), & { border-style: none; }}
}

stacksidebar {
  &.sidebar {
    &:dir(ltr) list,
    &.left list,
    &.left:dir(rtl) list { @extend %sidebar_left; }

    &:dir(rtl) list,
    &.right list { @extend %sidebar_right; }
  }

  row {
    padding: 10px 4px;

    > label {
      padding-left: 6px;
      padding-right: 6px;
    }
    &.needs-attention {
      background-image: radial-gradient(circle closest-side at 5% 25%, $destructive_color 0%, $destructive_color 100%, transparent 100%);
      background-size: 70px;
      background-position: 4px;
      background-repeat: no-repeat;
    }
    &.activatable:selected.needs-attention {
      background-image: radial-gradient(circle closest-side at 5% 25%, $selected_fg_color 0%, $selected_fg_color 100%, transparent 100%);
      background-size: 70px;
      background-position: 4px;
      background-repeat: no-repeat;
    }
  }
}

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

  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_basic_flat;
      border-radius: 100%;
      -gtk-outline-radius: 100%;

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

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

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

    &:drop(active):not(:disabled) {
      &, label, image { color: $drop_target_color; }

      box-shadow: inset 0 1px $drop_target_color,
                  inset 0 -1px $drop_target_color;

      &:selected {
        &, label, image { color: $selected_fg_color; }
        background-color: $drop_target_color;
      }
    }
  }
}

//
// 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);
  }

  // this selects the "connect to server" label
  > actionbar > revealer > box > label {
    padding-left: 8px;
    padding-right: 8px;
  }
}

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

    &:selected { background-image: _solid($selected_bg_color); }

    &.wide {
      min-width: 5px;
      min-height: 5px;
      background-color: transparent;
    }
  }

  &.horizontal > separator {
    background-repeat: repeat-y;
    margin: 0 -3px 0 -3px;
    padding: 0 3px 0 3px;
    background-position: center;

    &.wide {
      margin: 0;
      padding: 0;
      background-repeat: no-repeat;
      background-position: center;
      background-image: -gtk-scaled(url("assets/pane-separator-vertical.png"), url("assets/pane-separator-vertical@2.png"));
      background-size: 2px 24px;
    }
  }

  &.vertical > separator {
    margin: -3px 0 -3px 0;
    padding: 3px 0 3px 0;
    background-repeat: repeat-x;
    background-position: center;

    &.wide {
      margin: 0;
      padding: 0;
      background-repeat: no-repeat;
      background-position: center;
      background-image: -gtk-scaled(url("assets/pane-separator.png"), url("assets/pane-separator@2.png"));
      background-size: 24px 2px;
    }
  }
}

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

  &.info,
  &.question,
  &.warning,
  &.error {
    background-color: $selected_bg_color;
    color: $selected_fg_color;
    caret-color: currentColor;

    button { @extend %selected_button }

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

    *:link { @extend %link_selected; }

    &:disabled {
      label, image { color: transparentize($selected_fg_color, 0.5); }
    }
  }

  &.warning { background-color: $warning_color; }
  &.error { background-color: $destructive_color; }
  &.question { background-color: $question_color; }
}

//
// Buttons on selected backgrounds
//
%selected_button {

  @at-root %selected_button_normal, & {
    color: $selected_fg_color;
    background-color: transparentize($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);

    @at-root %selected_button_flat_disabled,
    &:disabled {
      &, label { color: transparentize($selected_fg_color, 0.6); }
    }
  }
  &:hover {
    color: $selected_fg_color;
    background-color: transparentize($selected_fg_color, 0.8);
    border-color: transparentize($selected_fg_color, 0.2);
  }
  @at-root %selected_button_active,
  &:active, &:active:hover, &:checked {
    color: $selected_bg_color;
    background-color: $selected_fg_color;
    border-color: $selected_fg_color;
  }
  &:disabled {
    &, label { color: transparentize($selected_fg_color, 0.5); }
    background-color: transparentize($selected_fg_color, 1);
    border-color: transparentize($selected_fg_color, 0.6);

    @at-root %selected_button_disabled_checked,
    &:active, &:checked {
      color: $selected_bg_color;
      background-color: transparentize($selected_fg_color, 0.5);
      border-color: transparentize($selected_fg_color, 0.6);
    }
  }
}

//
// Tooltips
//
tooltip,
.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: $tooltip_bg_color;
    background-clip: padding-box;

    label { padding: 4px; }
  }

  color: $tooltip_fg_color;
  border-radius: 2px;
  border: 1px solid $tooltip_border_color;

  decoration { background-color: transparent; }

  * { // Yeah this is ugly
    background-color: transparent;
    color: $tooltip_fg_color;
  }
}

//
// 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.

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

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

  // border rounding
  &.top {
    border-top-left-radius: 3px;
    border-top-right-radius: 3px;

    overlay {
      border-top-left-radius: 3px;
      border-top-right-radius: 3px;
    }
  }
  &.bottom {
    border-bottom-left-radius: 3px;
    border-bottom-right-radius: 3px;

    overlay {
      border-bottom-left-radius: 3px;
      border-bottom-right-radius: 3px;
    }
  }
  &.left, &:first-child:not(.top) {
    border-top-left-radius: 3px;
    border-bottom-left-radius: 3px;

    overlay {
      border-top-left-radius: 3px;
      border-bottom-left-radius: 3px;
    }
  }
  &.right, &:last-child:not(.bottom) {
    border-top-right-radius: 3px;
    border-bottom-right-radius: 3px;

    overlay {
      border-top-right-radius: 3px;
      border-bottom-right-radius: 3px;
    }
  }
  &.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;
    }
  }

  // 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
  }
}

button.color {
  padding: 0;

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

// colorscale popup
colorchooser .popover.osd { border-radius: 3px; }

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

.scale-popup {
  .osd & { @extend %osd }

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

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

//
// Shortcuts Help
//
button.circular,
button.circular-button,
.stack-switcher > button.circular {
  min-width: 24px;
  min-height: 24px;
  padding: 5px;
  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));
}

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


//
// Window Decorations
//
decoration {
  border-radius: 8px 8px 0 0;
  border-width: 0px;

  $_wm_border: if($variant=='light', transparentize(black, 0.80), transparentize(black, 0.65));
  $_wm_border_backdrop: if($variant=='light', transparentize(black, 0.85), transparentize(black, 0.7));

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

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

  &:backdrop {
    // 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 3px 9px 1px transparent,
                0 2px 6px 2px transparentize(black, 0.8),
                0 0 0 1px $wm_border_unfocused;
  }

  .fullscreen &,
  .maximized &,
  .tiled &,
  .tiled &:backdrop {
    border-radius: 0;
    box-shadow: 0 3px 9px 1px transparent,
                0 2px 6px 2px transparent,
                0 0 0 1px $wm_border_unfocused;
  }
  .popup & {
    box-shadow: none;
    border-radius: 0;
  }
  // server-side decorations as used by mutter
  .ssd & {
    border-radius: 8px 8px 0 0;
    box-shadow: 0 0 0 1px if($variant == 'dark', transparentize(black, 0.35), $wm_border);

    &.maximized { border-radius: 0; }
  }
  .csd.popup & {
    border-radius: 2px;
    box-shadow: 0 1px 4px transparentize(black, 0.8),
                0 0 0 1px transparentize($wm_border, 0.1);
  }
  tooltip.csd & {
    border-radius: 2px;
    box-shadow: 0 1px 3px 1px $_wm_border;
  }
  message-dialog.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-top: 0px;                       // already handled by the titlebar-padding
    padding-bottom: 0px;
    min-width: 22px;
    min-height: 22px;
    margin: 0;
  }

  button.titlebutton {
    $_wm_backdrop_icon_color: if($variant == 'light', darken($wm_icon_unfocused_bg, 5%), lighten($wm_icon_unfocused_bg, 5%));

    min-width: 18px;
    min-height: 18px;
    @extend .image-button;

    padding: 10px 3px;
    margin: 0;
    transition: none;

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

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

    &.close, &.maximize, &.minimize {
      -gtk-icon-theme: "Mint-Y";

      background-color: transparent;
      background-size: 18px 18px;
      background-position: center;
      background-repeat: no-repeat;
      border-width: 0;
    }

    &.close {
      color: $selected_fg_color;
      @include draw_circle($selected_bg_color);

      &:hover { @include draw-circle(lighten($selected_bg_color, 5%)); }
      &:active { @include draw-circle(darken($selected_bg_color, 5%)); }
      &:backdrop { @include draw-circle($_wm_backdrop_icon_color); }
    }

    &.maximize,
    &.minimize {
      &:hover,
      &:hover:backdrop {
        @include draw-circle($wm_button_hover_bg);
      }
      &:active,
      &:active:backdrop {
        @include draw-circle($wm_button_active_bg);
      }
      &:backdrop {
        color: $_wm_backdrop_icon_color;
      }
    }
  }
}

// catch all extend
%selected_items {
  background-color: $selected_bg_color;

  @at-root %nobg_selected_items, & {
    color: $selected_fg_color;

    @at-root %selected_items_disabled,
    &:disabled { color: mix($selected_fg_color, $selected_bg_color, 50%); }
  }
}