diff gtk-3.24/_common.scss @ 97:d721ae7a505b

Add support for GTK 3.24 changes
author IBBoard <dev@ibboard.co.uk>
date Sat, 26 Mar 2022 20:01:55 +0000
parents
children
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gtk-3.24/_common.scss	Sat Mar 26 20:01:55 2022 +0000
@@ -0,0 +1,4855 @@
+@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($variant=='dark', '-dark', '');
+$backdrop_transition: 200ms ease-out;
+$button_transition: all 200ms $ease-out-quad;
+$button_radius: 5px;
+$menu_radius: 5px;
+$window_radius: $button_radius + 3;
+$popover_radius: $button_radius + 4;
+
+// Optional compact sizes for buttons, headerbar and headerbar widgets
+$_sizevariant: 'default'; //compact otherwise
+$_headerbar_height: if($_sizevariant=='default', 46px, 40px);
+$_entry_height: if($_sizevariant=='default', 32px, 28px);
+$_btn_pad: if($_sizevariant=='default', 4px 9px, 2px 6px);
+$_hb_btn_pad: if($_sizevariant=='default', 6px, 5px);
+$_img_btn_pad: if($_sizevariant=='default', 5px, 2px);
+$_sel_menu_pad: if($_sizevariant=='default', 6px 10px, 4px 10px);
+$_circ_btn_pad: if($_sizevariant=='default', 4px, 2px);
+$_switch_margin: if($_sizevariant=='default', 10px, 7px);
+
+* {
+  padding: 0;
+  -GtkToolButton-icon-spacing: 4;
+  -GtkTextView-error-underline-color: $error_color;
+
+  // The size for scrollbars. The slider is 2px smaller, but we keep it
+  // up so that the whole area is sensitive to button presses for the
+  // slider. The stepper button is larger in both directions, the slider
+  // only in the width
+
+  -GtkScrolledWindow-scrollbar-spacing: 0;
+
+  -GtkToolItemGroup-expander-size: 11;
+
+  -GtkWidget-text-handle-width: 20;
+  -GtkWidget-text-handle-height: 24;
+
+  -GtkDialog-button-spacing: 4;
+  -GtkDialog-action-area-border: 0;
+
+  // We use the outline properties to signal the focus properties
+  // to the adwaita engine: using real CSS properties is faster,
+  // and we don't use any outlines for now.
+
+  outline-color: gtkalpha(currentColor, 0.3);
+  outline-style: dashed;
+  outline-offset: -3px;
+  outline-width: 1px;
+  -gtk-outline-radius: $button-radius - 2;
+
+  -gtk-secondary-caret-color: $selected_bg_color
+}
+
+
+/***************
+ * Base States *
+ ***************/
+.background {
+  color: $fg_color;
+  background-color: $bg_color;
+
+  &:backdrop {
+    color: $backdrop_fg_color;
+    background-color: $backdrop_bg_color;
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+  }
+}
+
+/*
+   These wildcard seems unavoidable, need to investigate.
+   Wildcards are bad and troublesome, use them with care,
+   or better, just don't.
+   Everytime a wildcard is used a kitten dies, painfully.
+*/
+
+*:disabled { -gtk-icon-effect: dim; }
+
+.gtkstyle-fallback {
+  color: $fg_color;
+  background-color: $bg_color;
+
+  &:hover {
+    color: $fg_color;
+    background-color: lighten($bg_color, 10%);
+  }
+
+  &:active {
+    color: $fg_color;
+    background-color: darken($bg_color, 10%);
+  }
+
+  &:disabled {
+    color: $insensitive_fg_color;
+    background-color: $insensitive_bg_color;
+  }
+
+  &:selected {
+    color: $selected_fg_color;
+    background-color: $selected_bg_color;
+  }
+}
+
+.view,
+%view {
+  color: $text_color;
+  background-color: $base_color;
+
+  &:backdrop {
+    color: $backdrop_text_color;
+    background-color: $backdrop_base_color;
+    &:disabled { color: $backdrop_insensitive_color; }
+  }
+
+  &:disabled {
+    color: $insensitive_fg_color;
+    background-color: $insensitive_bg_color;
+  }
+
+  &:selected {
+    &:focus, & {
+      @extend %selected_items;
+
+      border-radius: 3px;
+    }
+  }
+}
+
+.view,
+textview {
+  text {
+    @extend %view;
+
+    selection { &:focus, & { @extend %selected_items; }}
+  }
+}
+
+textview border { background-color: mix($bg_color, $base_color, 50%); }
+
+iconview { @extend .view; }
+
+.rubberband,
+rubberband {
+  border: 1px solid darken($selected_bg_color, 10%);
+  background-color: transparentize(darken($selected_bg_color, 10%), 0.8);
+}
+
+flowbox {
+  rubberband { @extend rubberband; }
+
+  flowboxchild {
+    padding: 3px;
+
+    &:selected {
+      @extend %selected_items;
+
+      outline-offset: -2px;
+    }
+  }
+}
+
+.content-view .tile {
+  margin: 2px;
+  background-color: if($variant=='light', transparent, black);
+  border-radius: 0;
+  padding: 0;
+  
+  &:backdrop { background-color: if($variant=='light', transparent, darken($backdrop_base_color,5%)); }
+  &:active, &:selected { background-color: if($variant=='light', transparent, $selected_bg_color); }
+  &:disabled { background-color: if($variant=='light', transparent, $insensitive_bg_color); }
+}
+
+label {
+  caret-color: currentColor; // this shouldn't be needed.
+
+  &.separator {
+    @extend .dim-label;
+  }
+
+  &:selected { @extend %nobg_selected_items; }
+
+  selection {
+    background-color: $selected_bg_color;
+    color: $selected_fg_color;
+  }
+
+  &:disabled {
+    color: $insensitive_fg_color;
+
+    button & { color: inherit; }
+
+    &:backdrop {
+      color: $backdrop_insensitive_color;
+
+      button & { color: inherit; }
+    }
+
+    selection { @extend %selected_items_disabled; }
+  }
+
+  &:backdrop {
+    selection { @extend %selected_items_backdrop; }
+  }
+
+  &.error {
+    color: $error_color;
+    &:disabled { color: transparentize($error_color,0.5); }
+    &:disabled:backdrop { color: transparentize($error_color,0.6); }
+  }
+}
+
+.dim-label {
+  opacity: 0.55;
+  text-shadow: none;
+}
+
+assistant {
+  .sidebar {
+    background-color: $base_color;
+    border-top: 1px solid $borders_color;
+
+    &:backdrop {
+      background-color: $backdrop_base_color;
+      border-color: $backdrop_borders_color;
+    }
+  }
+
+  &.csd .sidebar { border-top-style: none; }
+
+  .sidebar label { padding: 6px 12px; }
+
+  .sidebar label.highlight { background-color: mix($bg_color, $fg_color, 80%); }
+}
+
+%osd,
+.osd {
+  color: $osd_fg_color;
+  border: none;
+  background-color: $osd_bg_color;
+  background-clip: padding-box;
+  text-shadow: 0 1px black;
+  -gtk-icon-shadow: 0 1px black;
+
+  &:backdrop {
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+  }
+}
+
+
+/*********************
+ * Spinner Animation *
+ *********************/
+@keyframes spin {
+  to { -gtk-icon-transform: rotate(1turn); }
+}
+
+spinner {
+  background: none;
+  &:backdrop { color: $backdrop_fg_color; }
+  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; }
+  }
+}
+
+/**********************
+ * General Typography *
+ **********************/
+
+.large-title {
+   font-weight: 300;
+   font-size: 24pt;
+}
+.title-1 {
+   font-weight: 800;
+   font-size: 20pt;
+}
+.title-2 {
+   font-weight: 800;
+   font-size: 15pt;
+}
+.title-3 {
+   font-weight: 700;
+   font-size: 15pt;
+}
+.title-4 {
+   font-weight: 700;
+   font-size: 13pt;
+}
+.heading {
+   font-weight: 700;
+   font-size: 11pt;
+}
+.body {
+   font-weight: 400;
+   font-size: 11pt;
+}
+.caption-heading {
+   font-weight: 700;
+   font-size: 9pt;
+}
+.caption {
+   font-weight: 400;
+   font-size: 9pt;
+}
+
+/****************
+ * Text Entries *
+ ****************/
+
+%entry,
+entry {
+  %entry_basic, & {
+    min-height: $_entry_height;
+    padding-left: 8px;
+    padding-right: 8px;
+    border: 1px solid;
+    border-radius: $button_radius;
+    transition: all 200ms $ease-out-quad;
+
+    @include entry(normal);
+
+    image { // icons inside the entry
+      &.left { margin-right: 6px; }
+      &.right { margin-left: 6px; }
+    }
+
+
+    &.flat {
+      &:focus, &:backdrop, &:disabled, &:backdrop:disabled, & {
+        min-height: 0;
+        padding: 2px;
+        background-color: transparent;
+        border-color: transparent;
+        border-radius: 0;
+      }
+    }
+
+    &:focus { @include entry(focus); }
+
+    &:disabled { @include entry(insensitive); }
+
+    &:backdrop {
+      @include entry(backdrop);
+
+      transition: $backdrop_transition;
+    }
+
+    &:backdrop:disabled { @include entry(backdrop-insensitive); }
+
+    selection { @extend %selected_items; }
+
+    // entry error and warning style
+    @each $e_type, $e_color in (error, $error_color),
+                               (warning, $warning_color) {
+      &.#{$e_type} {
+        color: $e_color;
+        border-color: entry_focus_border($e_color);
+
+        &:focus { @include entry(focus, $e_color); }
+
+        selection { background-color: $e_color; }
+      }
+    }
+
+    image { // entry icons colors
+      color: mix($fg_color, $base_color, 80%);
+
+      &:hover { color: $fg_color; }
+
+      &:active { color: $selected_bg_color; }
+
+      &:backdrop { color: mix($backdrop_fg_color, $backdrop_base_color, 80%); }
+    }
+
+    &:drop(active) {
+      &:focus, & {
+        border-color: $drop_target_color;
+        box-shadow: inset 0 0 0 1px $drop_target_color;
+      }
+    }
+
+    .osd & {
+      @include entry(osd);
+
+      &:focus { @include entry(osd-focus); }
+
+      &:backdrop { @include entry(osd-backdrop); }
+
+      &:disabled { @include entry(osd-insensitive); }
+    }
+  }
+
+  progress {
+    margin: 2px -6px;
+    background-color: transparent;
+    background-image: none;
+    border-radius: 0;
+    border-width: 0 0 2px;
+    border-color: $progress_bg_color;
+    border-style: solid;
+    box-shadow: none;
+
+    &:backdrop { background-color: transparent; }
+  }
+
+   // linked entries
+  .linked:not(.vertical) > & { @extend %linked; }
+  .linked:not(.vertical) > &:focus + &,
+  .linked:not(.vertical) > &:focus + button,
+  .linked:not(.vertical) > &:focus + combobox > box > button.combo { border-left-color: entry_focus_border(); }
+
+  .linked:not(.vertical) > &:focus.error + &,
+  .linked:not(.vertical) > &:focus.error + button,
+  .linked:not(.vertical) > &:focus.error + combobox > box > button.combo { border-left-color: entry_focus_border($error_color); }
+
+  .linked:not(.vertical) > &:drop(active) + &,
+  .linked:not(.vertical) > &:drop(active) + button,
+  .linked:not(.vertical) > &:drop(active) + combobox > box > button.combo { border-left-color: $drop_target_color; }
+
+  // Vertically linked entries
+  // FIXME: take care of "colored" entries
+  .linked.vertical > & {
+    @extend %linked_vertical;
+
+    // brighter border between linked entries
+    &:not(:disabled) + entry:not(:disabled),
+    &:not(:disabled) + %entry:not(:disabled) {
+      border-top-color: mix($borders_color, $base_color, 30%);
+
+      &:backdrop { border-top-color: mix($backdrop_borders_color, $backdrop_base_color, 30%); }
+    }
+
+    // brighter border between linked insensitive entries
+    &:disabled + %entry:disabled,
+    &:disabled + entry:disabled { border-top-color: mix($borders_color, $base_color, 30%); }
+
+    // color back the top border of a linked focused entry following another entry.
+    // :not(:only-child) is a specificity bump hack.
+    + %entry:focus:not(:only-child),
+    + entry:focus:not(:only-child) { border-top-color: entry_focus_border(); }
+
+    + %entry:focus.error:not(:only-child),
+    + entry:focus.error:not(:only-child) { border-top-color: entry_focus_border($error_color); }
+
+    + %entry:drop(active):not(:only-child),
+    + entry:drop(active):not(:only-child) { border-top-color: $drop_target_color; }
+
+    // this takes care of coloring the top border of the focused entry subsequent widget.
+    // :not(:only-child) is a specificity bump hack.
+    &:focus:not(:only-child) {
+      + %entry,
+      + entry,
+      + button,
+      + combobox > box > button.combo { border-top-color: entry_focus_border(); }
+    }
+
+    &:focus.error:not(:only-child) {
+      + %entry,
+      + entry,
+      + button,
+      + combobox > box > button.combo { border-top-color: entry_focus_border($error_color); }
+    }
+
+    &:drop(active):not(:only-child) {
+      + %entry,
+      + entry,
+      + button,
+      + combobox > box > button.combo { border-top-color: $drop_target_color; }
+    }
+  }
+
+  &.error { color: $error_color; }
+}
+
+treeview entry {
+  &:focus {
+    &:dir(rtl), &:dir(ltr) { // specificity bump hack
+      background-color: $base_color;
+      transition-property: color, background;
+    }
+  }
+
+  &.flat, & {
+    border-radius: 0;
+    background-image: none;
+    background-color: $base_color;
+
+    &:focus { border-color: $selected_bg_color; }
+  }
+}
+
+.entry-tag {
+  // sizing
+  padding: 5px;
+
+  margin-top: 2px;
+  margin-bottom: 2px;
+
+  // side margins: compensate the entry padding with a negative margin
+  // then the negative margin itself
+  :dir(ltr) & {
+    margin-left: 8px;
+    margin-right: -5px;
+  }
+  :dir(rtl) & {
+    margin-left: -5px;
+    margin-right: 8px;
+  }
+
+  border-style: none;
+
+  $_entry_tag_color: if($variant=='light', $selected_fg_color, $base_color);
+  color: $_entry_tag_color;
+
+  $_entry_tag_bg: if($variant=='light', $selected_bg_color, mix($fg_color, $base_color, 50%));
+  background-color: $_entry_tag_bg;
+
+  &:hover {
+    background-color: lighten($_entry_tag_bg, 10%);
+  }
+
+  :backdrop & {
+    color: $backdrop_base_color;
+    background-color: if($variant=='light', $selected_bg_color,
+                                            mix($backdrop_fg_color, $backdrop_base_color, 50%));
+  }
+
+  &.button {
+    background-color: transparent;
+    color: transparentize($_entry_tag_color, 0.3);
+  }
+
+  :not(:backdrop) &.button {
+    &:hover {
+      border: 1px solid $_entry_tag_bg;
+      color: $_entry_tag_color;
+    }
+    &:active {
+      background-color: $_entry_tag_bg;
+      color: transparentize($_entry_tag_color, 0.3);
+    }
+  }
+}
+
+/***********
+ * Buttons *
+ ***********/
+// stuff for .needs-attention
+$_dot_color: if($variant=='light', $selected_bg_color,
+                                   lighten($selected_bg_color,15%));
+@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 {
+  @at-root %button_basic, & {
+
+    min-height: 24px;
+    min-width: 16px;
+    padding: $_btn_pad;
+    border: 1px solid;
+    border-radius: $button_radius;
+    transition: $button_transition;
+
+    @include button(normal);
+
+    @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: 500ms;
+
+        &:active { transition: $button_transition; }
+      }
+    }
+
+    &:hover {
+      @include button(hover);
+      -gtk-icon-effect: highlight;
+    }
+
+    &:active,
+    &:checked {
+      @include button(active);
+
+      transition-duration: 50ms;
+    }
+
+    &:backdrop {
+      &.flat, & {
+        @include button(backdrop);
+
+        transition: $backdrop_transition;
+        -gtk-icon-effect: none;
+
+        &:active,
+        &:checked { @include button(backdrop-active); }
+
+        &:disabled {
+          @include button(backdrop-insensitive);
+
+          &:active,
+          &:checked { @include button(backdrop-insensitive-active); }
+        }
+      }
+    }
+
+    @at-root %button_basic_flat,
+    &.flat { &:backdrop, &:disabled, &:backdrop:disabled { @include button(undecorated); }}
+
+    &:disabled {
+      @include button(insensitive);
+
+      &:active,
+      &:checked { @include button(insensitive-active); }
+    }
+
+    &.image-button {
+      min-width: 24px;
+      padding-left: $_img_btn_pad;
+      padding-right: $_img_btn_pad;
+    }
+
+    &.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;
+      }
+    }
+
+    @at-root %button_basic_drop_active,
+    &:drop(active) {
+      color: $drop_target_color;
+      border-color: $drop_target_color;
+      box-shadow: inset 0 0 0 1px $drop_target_color;
+    }
+  }
+
+  @at-root %button_selected, & {
+    row:selected & {
+      @if $variant == 'light' { border-color: $selected_borders_color; }
+    }
+
+    @at-root %button_selected_flat, &.flat {
+      row:selected & {
+        &:not(:active):not(:checked):not(:hover):not(disabled) {
+          color: $selected_fg_color;
+          border-color: transparent;
+
+          &:backdrop { color: if($variant=='light', $backdrop_base_color, $backdrop_fg_color); }
+        }
+      }
+    }
+  }
+
+
+  // big standalone buttons like in Documents pager
+  &.osd {
+    min-width: 26px;
+    min-height: 32px;
+
+    &.image-button { min-width: 34px; }
+
+    color: $osd_fg_color;
+    border-radius: 5px;
+
+    @include button(osd);
+
+    border: none;
+    box-shadow: none;
+
+    &:hover {
+      @include button(osd-hover);
+
+      border: none;
+      box-shadow: none;
+    }
+
+    &:active,
+    &:checked {
+      @include button(osd-active);
+
+      border: none;
+      box-shadow: none;
+    }
+
+    &:disabled {
+      &:backdrop, & {
+        @include button(osd-insensitive);
+
+        border: none;
+      }
+    }
+
+    &:backdrop {
+      @include button(osd-backdrop);
+
+      border: none;
+    }
+  }
+
+  //overlay / OSD style
+  @at-root %osd_button,
+  .osd & {
+    @include button(osd);
+
+    &:hover { @include button(osd-hover); }
+
+    &:active,
+    &:checked { &:backdrop, & { @include button(osd-active); }}
+
+    &:disabled { &:backdrop, & { @include button(osd-insensitive); }}
+
+    &:backdrop { @include button(osd-backdrop); }
+
+    &.flat {
+      @include button(undecorated);
+
+      box-shadow: none; //FIXME respect no edge on the button mixin
+      text-shadow: 0 1px black;
+      -gtk-icon-shadow: 0 1px black;
+
+      &:hover { @include button(osd-hover); }
+
+      &:disabled {
+        @include button(osd-insensitive);
+        background-image: none;
+        border-color: transparent;
+        box-shadow: none;
+      }
+
+      &:backdrop { @include button(undecorated); }
+
+      &:active,
+      &:checked { @include button(osd-active); }
+    }
+  }
+
+  // Suggested and Destructive Action buttons
+  @each $b_type, $b_color in (suggested-action, $suggested_bg_color),
+                             (destructive-action, $destructive_color) {
+    &.#{$b_type} {
+      @include button(normal, $b_color, white);
+
+      &.flat {
+        @include button(undecorated);
+
+        color: $b_color; //FIXME: does it work on the dark variant?
+      }
+
+      &:hover { @include button(hover, $b_color, white); }
+
+      &:active,
+      &:checked { @include button(active, $b_color, white); }
+
+      &:backdrop,
+      &.flat:backdrop {
+        @include button(backdrop, $b_color, white);
+
+        &:active,
+        &:checked { @include button(backdrop-active, $b_color, white); }
+
+        &:disabled {
+          @include button(backdrop-insensitive);
+
+          &:active,
+          &:checked { @include button(backdrop-insensitive-active, $b_color, white); }
+        }
+      }
+
+      &.flat {
+        &:backdrop, &:disabled, &:backdrop:disabled {
+          @include button(undecorated);
+
+          color: transparentize($b_color, 0.2);
+        }
+      }
+
+      &:disabled {
+        @include button(insensitive);
+
+        &:active,
+        &:checked { @include button(insensitive-active, $b_color, white); }
+      }
+
+      .osd & {
+        @include button(osd, $b_color);
+
+        &:hover { @include button(osd-hover, $b_color); }
+
+        &:active,
+        &:checked { &:backdrop, & { @include button(osd-active, $b_color); }}
+
+        &:disabled { &:backdrop, & { @include button(osd-insensitive, $b_color); }}
+
+        &:backdrop { @include button(osd-backdrop, $b_color); }
+      }
+    }
+  }
+
+  .stack-switcher > & {
+    // to position the needs attention dot, padding is added to the button
+    // child, a label needs just lateral padding while an icon needs vertical
+    // padding added too.
+
+    outline-offset: -3px; // needs to be set or it gets overriden by GtkRadioButton outline-offset
+
+    > label {
+      padding-left: 6px;  // label padding
+      padding-right: 6px; //
+    }
+
+    > image {
+      padding-left: 6px;   // image padding
+      padding-right: 6px;  //
+      padding-top: 3px;    //
+      padding-bottom: 3px; //
+    }
+
+    &.text-button {
+      // compensate text-button paddings
+      padding-left: 10px;
+      padding-right: 10px;
+    }
+
+    &.image-button {
+      // we want image buttons to have a 1:1 aspect ratio, so compensation
+      // of the padding added to the GtkImage is needed
+      padding-left: 2px;
+      padding-right: 2px;
+    }
+
+    &.needs-attention {
+      > label,
+      > image { @extend %needs_attention; }
+
+      &:active,
+      &:checked {
+        > label,
+        > image {
+          animation: none;
+          background-image: none;
+        }
+      }
+    }
+  }
+
+  // hide separators
+  &.font,
+  &.file { separator { background-color: transparent; }}
+
+  &.font { > box > box > label { font-weight: bold; }}
+
+  // inline-toolbar buttons
+  .inline-toolbar & { @extend %linked; }
+
+  .primary-toolbar & { -gtk-icon-shadow: none; } // tango icons don't need shadows
+
+  .linked > & { @extend %linked; }
+
+  .linked.vertical > & { @extend %linked_vertical; }
+
+  &.circular { // The Bloody Circul Button
+    border-radius: 9999px;
+    -gtk-outline-radius: 9999px;
+    padding: $_circ_btn_pad; /* circles instead of ellipses */
+
+    label { padding: 0; }
+
+    // the followind code is needed since we use a darker bottom border on buttons, which looks pretty
+    // bad with a 100% border radius (see https://bugzilla.gnome.org/show_bug.cgi?id=771205 for details),
+    // so on relevant states we an additional background-image with a gradient clipped on the border-box,
+    // so setting a transparent border would reveal it.
+
+    $_border_bg: linear-gradient(to top, $alt-borders-color 25%, $borders-color 50%);
+
+    &:not(.flat):not(.osd):not(:checked):not(:active):not(:disabled):not(:backdrop) {
+      @include button(normal, $backimage: $_border_bg);
+
+      border-color: transparent;
+    }
+
+    &:hover:not(.osd):not(:checked):not(:active):not(:disabled):not(:backdrop) {
+      @include button(hover, $backimage: $_border_bg);
+
+      border-color: transparent;
+    }
+
+    background-origin: padding-box, border-box;
+    background-clip: padding-box, border-box;
+  }
+}
+
+%needs_attention {
+  animation: needs_attention 150ms ease-in;
+  $_dot_shadow: _text_shadow_color();
+  $_dot_shadow_r: if($variant=='light',0.5,0.45);
+  background-image: -gtk-gradient(radial,
+                                  center center, 0,
+                                  center center, 0.5,
+                                  to($_dot_color),
+                                  to(transparent)),
+                    -gtk-gradient(radial,
+                                  center center, 0,
+                                  center center, $_dot_shadow_r,
+                                  to($_dot_shadow),
+                                  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; }
+
+  &:backdrop { background-size: 6px 6px, 0 0;}
+
+  &:dir(rtl) {
+    @if $variant == 'light' { background-position: left 3px, left 4px; }
+
+    @else { background-position: left 3px, left 2px; }
+  }
+}
+
+
+// all the following is for the +|- buttons on inline toolbars, that way
+// should really be deprecated...
+.inline-toolbar toolbutton > button { // redefining the button look is
+                                      // needed since those are flat...
+  @include button(normal);
+
+  &:hover { @include button(hover); }
+
+  &:active,
+  &:checked{ @include button(active); }
+
+  &:disabled {
+    @include button(insensitive);
+
+    &:active,
+    &:checked { @include button(insensitive-active); }
+  }
+
+  &:backdrop {
+    @include button(backdrop);
+
+    &:active,
+    &:checked { @include button(backdrop-active); }
+
+    &:disabled {
+      @include button(backdrop-insensitive);
+
+      &:active,
+      &:checked { @include button(backdrop-insensitive-active); }
+    }
+  }
+}
+
+// More inline toolbar buttons
+toolbar.inline-toolbar toolbutton {
+  > 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-right-style: none;
+  border-radius: 0;
+  -gtk-outline-radius: 0;
+}
+
+%linked_left {
+    border-top-left-radius: $button_radius;
+    border-bottom-left-radius: $button_radius;
+    -gtk-outline-top-left-radius: $button_radius;
+    -gtk-outline-bottom-left-radius: $button_radius;
+}
+
+%linked_right {
+    border-right-style: solid;
+    border-top-right-radius: $button_radius;
+    border-bottom-right-radius: $button_radius;
+    -gtk-outline-top-right-radius: $button_radius;
+    -gtk-outline-bottom-right-radius: $button_radius;
+}
+
+%linked_only_child {
+    border-style: solid;
+    border-radius: $button_radius;
+    -gtk-outline-radius: $button_radius;
+}
+
+// .linked assumes Box, which reverses nodes in RTL, so 1st child is always left
+%linked {
+  @extend %linked_middle;
+
+  &:first-child { @extend %linked_left; }
+  &:last-child { @extend %linked_right; }
+
+  &:only-child { @extend %linked_only_child; }
+}
+
+// Other widgets use widget child order, so 1st/last child are at text start/end
+%linked_flippable {
+  @extend %linked_middle;
+
+  &:dir(ltr) {
+    &:first-child { @extend %linked_left; }
+    &:last-child { @extend %linked_right; }
+  }
+
+  &:dir(rtl) {
+    &:first-child { @extend %linked_right; }
+    &:last-child { @extend %linked_left; }
+  }
+
+  &:only-child { @extend %linked_only_child; }
+}
+
+%linked_vertical_middle {
+  border-style: solid solid none solid;
+  border-radius: 0;
+  -gtk-outline-radius: 0;
+}
+
+%linked_vertical_top {
+  border-top-left-radius: $button_radius;
+  border-top-right-radius: $button_radius;
+  -gtk-outline-top-left-radius: $button_radius;
+  -gtk-outline-top-right-radius: $button_radius;
+}
+
+%linked_vertical_bottom {
+  border-bottom-style: solid;
+  border-bottom-left-radius: $button_radius;
+  border-bottom-right-radius: $button_radius;
+  -gtk-outline-bottom-left-radius: $button_radius;
+  -gtk-outline-bottom-right-radius: $button_radius;
+}
+
+%linked_vertical_only_child {
+  border-style: solid;
+  border-radius: $button_radius;
+  -gtk-outline-radius: $button_radius;
+}
+
+%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 {
+  background-color: transparent;
+  background-image: none;
+  border-color: transparent;
+  box-shadow: inset 0 1px transparentize(white, 1),
+              0 1px transparentize(white, 1);
+  text-shadow: none;
+  -gtk-icon-shadow: none;
+}
+
+/* menu buttons */
+modelbutton.flat,
+.menuitem.button.flat {
+  min-height: 26px;
+  padding-left: 5px;
+  padding-right: 5px;
+  border-radius: $button_radius;
+  outline-offset: -2px;
+
+  @extend %undecorated_button;
+
+  &:hover { background-color: $popover_hover_color; }
+
+  &:selected { @extend %selected_items; }
+
+  &:backdrop,
+  &:backdrop:hover { @extend %undecorated_button; }
+}
+
+modelbutton.flat arrow {
+  background: none;
+
+  &:hover { background: none; }
+
+  &.left { -gtk-icon-source: -gtk-icontheme("pan-start-symbolic"); }
+
+  &.right { -gtk-icon-source: -gtk-icontheme("pan-end-symbolic"); }
+}
+
+button.color {
+  padding: 4px;
+
+  colorswatch:only-child {
+    &, overlay { border-radius: 0; }
+
+    @if $variant == 'light' {
+      box-shadow: 0 1px _text_shadow_color();
+
+      .osd & { box-shadow: none; }
+    }
+  }
+
+  @if $variant == 'light' {
+    .osd &, & {
+      &:disabled,
+      &:backdrop,
+      &:active,
+      &:checked { colorswatch:only-child { box-shadow: none; }}
+    }
+  }
+}
+
+/* list buttons */
+/* tone down as per new designs, see issue #1473, #1748 */
+list row button.image-button:not(.flat) {
+  @extend %undecorated_button;
+  border: 1px solid transparentize($borders_color, .5);
+  &:hover { @include button(hover); }
+  &:active,
+  &:checked { @include button(active); }
+}
+
+/*********
+ * Links *
+ *********/
+
+%link,
+*:link {
+  color: $link_color;
+
+  &:visited {
+    color: $link_visited_color;
+
+    *:selected & { color: mix($selected_fg_color, $link_visited_color, 60%); }
+  }
+
+  &:hover {
+    $_fg: lighten($link_color, 10%);
+    color: $_fg;
+
+    *:selected & { color: mix($selected_fg_color, $_fg, 90%); }
+  }
+
+  &:active {
+    color: $link_color;
+
+    *:selected & { color: mix($selected_fg_color, $link_color, 80%); }
+  }
+
+  &:disabled, &:disabled:backdrop { color: transparentize(desaturate($link_color, 100%), 0.2); }
+
+  &:backdrop { &:backdrop:hover, &:backdrop:hover:selected, & { color: transparentize($link_color, 0.1); }}
+
+  @at-root %link_selected,
+  &:selected,
+  *:selected & { color: mix($selected_fg_color, $link_color, 80%); }
+}
+
+button:link,
+button:visited {
+  @extend %undecorated_button;
+
+  @extend %link;
+
+  text-shadow: none;
+
+  &:hover,
+  &:active,
+  &:checked {
+    @extend %undecorated_button;
+
+    text-shadow: none;
+  }
+
+  > label {
+    @extend %link;
+
+    text-decoration-line: underline;
+
+  }
+}
+
+
+/*****************
+ * GtkSpinButton *
+ *****************/
+spinbutton {
+  &:not(.vertical) {
+    // in this horizontal configuration, the whole spinbutton
+    // behaves as the entry, so we extend the entry styling
+    // and nuke the style on the internal entry
+    @extend %entry;
+
+    padding: 0;
+
+    %spinbutton_horz_entry {
+      min-width: 28px;
+      // reset all the other props since the spinbutton node is styled here
+      margin: 0;
+      background: none;
+      background-color: transparent;
+      border: none;
+      border-radius: 0;
+      box-shadow: none;
+
+      &:backdrop:disabled { background-color: transparent; }
+    }
+
+    entry {
+      @extend %spinbutton_horz_entry;
+    }
+
+    button {
+      min-height: 16px;
+      margin: 0;
+      padding-bottom: 0;
+      padding-top: 0;
+      color: mix($fg_color, $base_color, 90%);
+      background-image: none;
+      border-style: none none none solid;
+      border-color: transparentize($borders_color, 0.7);
+      border-radius: 0;
+      box-shadow: none;
+
+      &:dir(rtl) { border-style: none solid none none; }
+
+      &:hover {
+        color: $fg_color;
+        background-color: $base_hover_color;
+      }
+
+      &:disabled {
+        color: transparentize($insensitive_fg_color, 0.7);
+        background-color: transparent;
+      }
+
+      &:active {
+        background-color: transparentize(black, 0.9);
+        box-shadow: inset 0 2px 3px -1px transparentize(black, 0.8);
+      }
+
+      &:backdrop {
+        color: mix($backdrop_fg_color, $backdrop_base_color, 90%);
+        background-color: transparent;
+        border-color: transparentize($backdrop_borders_color, 0.7);
+        transition: $backdrop_transition;
+      }
+
+      &:backdrop:disabled {
+        color: transparentize($backdrop_insensitive_color,0.7);
+        background-color: transparent;
+        background-image: none;
+        border-style: none none none solid; // It is needed or it gets overridden
+
+        &:dir(rtl) { border-style: none solid none none; }
+      }
+
+      &:dir(ltr):last-child { border-radius: 0 $button_radius $button_radius 0; }
+
+      &:dir(rtl):first-child { border-radius: $button_radius 0 0 $button_radius; }
+    }
+  }
+
+  // OSD horizontal
+  .osd &:not(.vertical) {
+    entry {
+      @extend %spinbutton_horz_entry;
+    }
+
+    button {
+      @include button(undecorated);
+
+      color: $osd_fg_color;
+      border-style: none none none solid;
+      border-color: transparentize($osd_borders_color, 0.3);
+      border-radius: 0;
+      box-shadow: none;
+      -gtk-icon-shadow: 0 1px black;
+
+      &:dir(rtl) { border-style: none solid none none; }
+
+      &:hover {
+        @include button(undecorated);
+
+        color: $osd_fg_color;
+        border-color: transparentize(opacify($osd_borders_color, 1), 0.5);
+        background-color: transparentize($osd_fg_color, 0.9);
+        -gtk-icon-shadow: 0 1px black;
+        box-shadow: none;
+      }
+
+      &:backdrop {
+        @include button(undecorated);
+
+        color: $osd_fg_color;
+        border-color: transparentize(opacify($osd_borders_color, 1), 0.5);
+        -gtk-icon-shadow: none;
+        box-shadow: none;
+      }
+
+      &:disabled {
+        @include button(undecorated);
+
+        color: $osd_insensitive_fg_color;
+        border-color: transparentize(opacify($osd_borders_color, 1), 0.5);
+        -gtk-icon-shadow: none;
+        box-shadow: none;
+      }
+
+      &:dir(ltr):last-child { border-radius: 0 $button_radius $button_radius 0; }
+
+      &:dir(rtl):first-child { border-radius: $button_radius 0 0 $button_radius; }
+    }
+  }
+
+  // Vertical
+  &.vertical {
+    // in the vertical configuration, we treat the spinbutton
+    // as a box, and tweak the style of the entry in the middle
+    // so that it's linked
+
+    // FIXME: this should not be set at all, but otherwise it gets the wrong
+    // color
+    &:disabled { color: $insensitive_fg_color; }
+
+    &:backdrop:disabled { color: $backdrop_insensitive_color; }
+
+    &:drop(active) {
+      border-color: transparent;
+      box-shadow: none;
+    }
+
+    entry {
+      min-height: 32px;
+      min-width: 32px;
+      padding: 0;
+      border-radius: 0;
+    }
+
+    button {
+      min-height: 32px;
+      min-width: 32px;
+      padding: 0;
+
+      &.up { @extend %top_button; }
+
+      &.down { @extend %bottom_button; }
+    }
+
+    %top_button {
+      border-radius: $button_radius $button_radius 0 0;
+      border-style: solid solid none solid;
+    }
+
+    %bottom_button {
+      border-radius: 0 0 $button_radius $button_radius;
+      border-style: none solid solid solid;
+    }
+  }
+
+  // OSD vertical
+  .osd &.vertical button:first-child {
+    @include button(osd);
+
+    &:hover { @include button(osd-hover);}
+
+    &:active { @include button(osd-active); }
+
+    &:disabled { @include button(osd-insensitive); }
+
+    &:backdrop { @include button(osd-backdrop); }
+  }
+
+  // Misc
+  treeview &:not(.vertical) {
+    min-height: 0;
+    border-style: none;
+    border-radius: 0;
+
+    entry {
+      min-height: 0;
+      padding: 1px 2px;
+    }
+  }
+  font-feature-settings: "tnum";
+}
+
+
+/**************
+ * ComboBoxes *
+ **************/
+combobox {
+  arrow {
+    -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
+    min-height: 16px;
+    min-width: 16px;
+  }
+
+  &.linked {
+    button:nth-child(2) {
+      &:dir(ltr) { @extend %linked_right; }
+      &:dir(rtl) { @extend %linked_left; }
+    }
+  }
+
+  &:drop(active) { // FIXME: untested
+    box-shadow: none;
+
+    button.combo { @extend %button_basic_drop_active; }
+  }
+}
+
+// the combo is a composite widget so the way we do button linking doesn't
+// work, special case needed. See
+// https://bugzilla.gnome.org/show_bug.cgi?id=733979
+
+.linked:not(.vertical) > combobox > box > button.combo { @extend %linked_middle; }
+.linked:not(.vertical) > combobox:first-child > box > button.combo { @extend %linked_left; }
+.linked:not(.vertical) > combobox:last-child > box > button.combo { @extend %linked_right; }
+.linked:not(.vertical) > combobox:only-child > box > button.combo { @extend %linked_only_child; }
+
+.linked.vertical > combobox > box > button.combo { @extend %linked_vertical_middle; }
+.linked.vertical > combobox:first-child > box > button.combo { @extend %linked_vertical_top; }
+.linked.vertical > combobox:last-child > box > button.combo { @extend %linked_vertical_bottom; }
+.linked.vertical > combobox:only-child > box > button.combo { @extend %linked_vertical_only_child; }
+
+
+/************
+ * Toolbars *
+ ************/
+%toolbar {
+  -GtkWidget-window-dragging: true;
+  padding: 4px;
+  background-color: $bg_color;
+}
+
+toolbar {
+  @extend %toolbar;
+
+  padding: 4px 3px 3px 4px;
+
+  // on OSD
+  .osd & { background-color: transparent; }
+
+  // stand-alone OSD toolbars
+  &.osd {
+    padding: 13px;
+    border: none;
+    border-radius: 5px;
+    background-color: $osd_bg_color;
+
+    &.left,
+    &.right,
+    &.top,
+    &.bottom { border-radius: 0; } // positional classes for `attached` osd toolbars
+  }
+
+  // toolbar separators
+  &.horizontal separator { margin: 0 7px 1px 6px; }
+  &.vertical separator { margin: 6px 1px 7px 0; }
+
+  &:not(.inline-toolbar):not(.osd) {
+    // workaround: add margins to the children of tool items to simulate
+    // spacing, ignore the overflow button (.toggle) and the overflow menu
+    // (.popup)
+    > *:not(.toggle):not(.popup) > * {
+      margin-right: 1px;
+      margin-bottom: 1px;
+    }
+  }
+}
+
+//searchbar, location-bar & inline-toolbar
+.inline-toolbar {
+  @extend %toolbar;
+
+  @extend %darkbar;
+
+  padding: 3px;
+  border-width: 0 1px 1px;
+  border-radius: 0  0 5px 5px;
+}
+
+searchbar > revealer > box,
+.location-bar {
+  @extend %toolbar;
+
+  @extend %darkbar;
+
+  border-width: 0 0 1px;
+  padding: 3px;
+}
+
+searchbar > revealer > box {
+  // workaround: undo the GtkContainer:border-width and use CSS padding instead
+  margin: -6px;
+  padding: 6px;
+}
+
+%darkbar {
+  border-style: solid;
+  border-color: $borders_color;
+  $_bg: mix($bg_color, $borders_color, 70%);
+  background-color: $_bg;
+
+  &:backdrop {
+    border-color: $backdrop_borders_color;
+    background-color: $backdrop_dark_fill;
+    box-shadow: none;
+    transition: $backdrop_transition;
+  }
+}
+
+
+/***************
+ * Header bars *
+ ***************/
+%titlebar,
+headerbar {
+  padding: 0 6px;
+  min-height: $_headerbar_height;
+  border-width: 0 0 1px;
+  border-style: solid;
+  border-color: $alt_borders_color;
+  border-radius: 0;
+
+  @include headerbar_fill(darken($bg_color, 10%));
+
+  &:backdrop {
+    border-color: $backdrop_borders_color;
+    background-color: $bg_color;
+    background-image: none;
+    box-shadow: inset 0 1px $top_hilight;
+
+    transition: $backdrop_transition;
+  }
+
+  .title {
+    padding-left: 12px;
+    padding-right: 12px;
+    font-weight: bold;
+  }
+
+  .subtitle {
+    font-size: smaller;
+    padding-left: 12px;
+    padding-right: 12px;
+
+    @extend .dim-label;
+  }
+
+  /* Darken switchbuttons for headerbars. issue #1588 */
+  stackswitcher button:checked,
+  button.toggle:checked {
+
+    background: if($variant == 'light', image(darken($bg_color, 17%)), image(darken($bg_color, 9%)));
+    border-color: darken($borders_color, 3%);
+    border-top-color: darken($borders_color, 8%);
+    &:backdrop {
+      @include button(backdrop-active);
+    }
+  }
+
+  .selection-mode &,
+  &.selection-mode {
+    $_hc: mix($top_hilight, $suggested_bg_color, 50%); // hilight color
+
+    color: $selected_fg_color;
+    border-color: $suggested_border_color;
+    text-shadow: 0 -1px transparentize(black, 0.5);
+
+    @include headerbar_fill($suggested_bg_color, $_hc);
+
+    &:backdrop {
+      background-color: $suggested_bg_color;
+      background-image: none;
+      box-shadow: inset 0 1px mix($top_hilight, $suggested_bg_color, 60%);
+      
+      label { 
+        text-shadow: none;
+        color: $selected_fg_color; 
+      }
+    }
+
+    .subtitle:link { @extend %link_selected; }
+
+    button {
+      @include button(normal, $suggested_bg_color, $selected_fg_color);
+
+      @at-root %selection_mode_button_flat,
+      &.flat { @include button(undecorated); }
+
+      &:hover { @include button(hover, $suggested_bg_color, $selected_fg_color); }
+
+      &:active,
+      &:checked,
+      &.toggle:checked,
+      &.toggle:active { @include button(active, $suggested_bg_color, $selected_fg_color); }
+
+      &:backdrop {
+        &.flat, & {
+          @include button(backdrop, $suggested_bg_color, $selected_fg_color);
+
+          -gtk-icon-effect: none;
+          border-color: $suggested_border_color;
+
+          &:active,
+          &:checked {
+            @include button(backdrop-active, $suggested_bg_color, $selected_fg_color);
+
+            border-color: $suggested_border_color;
+          }
+
+          &:disabled {
+            @include button(backdrop-insensitive, $suggested_bg_color, $selected_fg_color);
+
+            border-color: $suggested_border_color;
+
+            &:active, &:checked {
+              @include button(backdrop-insensitive-active, $suggested_bg_color, $selected_fg_color);
+
+              border-color: $suggested_border_color;
+            }
+          }
+        }
+      }
+
+      @at-root %selection_mode_button_flat,
+      &.flat { &:backdrop, &:disabled, &:backdrop:disabled { @include button(undecorated); }}
+
+      &:disabled {
+        @include button(insensitive, $suggested_bg_color, $selected_fg_color);
+
+        &:active,
+        &:checked { @include button(insensitive-active, $suggested_bg_color, $selected_fg_color); }
+      }
+
+      &.suggested-action {
+        @include button(normal);
+
+        border-color: $suggested_border_color;
+
+        &:hover {
+          @include button(hover);
+
+          border-color: $suggested_border_color;
+        }
+
+        &:active {
+          @include button(active);
+
+          border-color: $suggested_border_color;
+        }
+
+        &:disabled {
+          @include button(insensitive);
+
+          border-color: $suggested_border_color;
+        }
+
+        &:backdrop {
+          @include button(backdrop);
+
+          border-color: $suggested_border_color;
+        }
+
+        &:backdrop:disabled {
+          @include button(backdrop-insensitive);
+
+          border-color: $suggested_border_color;
+        }
+      }
+    }
+
+    .selection-menu {
+      &:backdrop, & {
+        border-color: transparentize($suggested_bg_color, 1);
+        background-color: transparentize($suggested_bg_color, 1);
+        background-image: none;
+        box-shadow: none;
+        min-height: 20px;
+        padding: $_sel_menu_pad;
+
+        arrow { -GtkArrow-arrow-scaling: 1; }
+
+        .arrow {
+          -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
+          color: transparentize($selected_fg_color,0.5);
+          -gtk-icon-shadow: none;
+        }
+      }
+    }
+  }
+
+  // squared corners when the window is maximized, tiled, or fullscreen
+  .tiled &,
+  .tiled-top &,
+  .tiled-right &,
+  .tiled-bottom &,
+  .tiled-left &,
+  .maximized &,
+  .fullscreen & {
+    &:backdrop, & {
+      border-radius: 0;
+    }
+  }
+
+  &.default-decoration {
+    min-height: 28px;
+    padding: 4px;
+
+    button.titlebutton {
+      min-height: 26px;
+      min-width: 26px;
+      margin: 0;
+      padding: 0;
+    }
+  }
+  
+
+  
+  separator.titlebutton { opacity: 0; } /* hide the close button separator */
+
+  .solid-csd & {
+    &:backdrop, & {
+      &:dir(rtl), &:dir(ltr) { // specificity bump
+        margin-left: -1px;
+        margin-right: -1px;
+        margin-top: -1px;
+        border-radius: 0;
+        box-shadow: none;
+      }
+    }
+  }
+}
+
+headerbar {
+  // add vertical margins to common widget on the headerbar to avoid them spanning the whole height
+  entry,
+  spinbutton,
+  separator:not(.sidebar),
+  button {
+    margin-top: $_hb_btn_pad;
+    margin-bottom: $_hb_btn_pad;
+  }
+  switch {
+    margin-top: $_switch_margin;
+    margin-bottom: $_switch_margin;
+  }
+
+  &.titlebar headerbar:not(.titlebar) {
+    // Drop the background of non-titlebar nested headerbars. This is needed to
+    // work around headerbar sliding animation issues without refactoring
+    // Adwaita's support of titlebars and headerbars as it may break
+    // applications.
+    // See https://gitlab.gnome.org/GNOME/gtk/issues/1264 for more information.
+    background: none;
+    box-shadow: none;
+  }
+}
+
+.background .titlebar {
+  &:backdrop, & {
+    border-top-left-radius: $window_radius;
+    border-top-right-radius: $window_radius;
+  }
+}
+
+.background.tiled .titlebar,
+.background.tiled-top .titlebar,
+.background.tiled-right .titlebar,
+.background.tiled-bottom .titlebar,
+.background.tiled-left .titlebar,
+.background.maximized .titlebar,
+.background.solid-csd .titlebar {
+  &:backdrop, & {
+    border-top-left-radius: 0;
+    border-top-right-radius: 0;
+  }
+}
+
+headerbar { // headerbar border rounding
+
+  window separator:first-child + &,
+  window &:first-child { &:backdrop, & { border-top-left-radius: 7px; }}
+  window &:last-child { &:backdrop, & { border-top-right-radius: 7px; }}
+
+  window stack & { // tackles the stacked headerbars case
+    &:first-child, &:last-child {
+      &:backdrop, & {
+        border-top-left-radius: 7px;
+        border-top-right-radius: 7px;
+      }
+    }
+  }
+
+  window.tiled &,
+  window.tiled-top &,
+  window.tiled-right &,
+  window.tiled-bottom &,
+  window.tiled-left &,
+  window.maximized &,
+  window.fullscreen &,
+  window.solid-csd & {
+    &, &:backdrop {
+      &,
+      &:first-child,
+      &:last-child,
+      &:only-child {
+        border-top-left-radius: 0;
+        border-top-right-radius: 0;
+      }
+    }
+  }
+}
+
+.titlebar:not(headerbar) {
+  window.csd > & {
+    // in csd we assume every titlebar is a headerbar so reset anything, this is needed for split toolbars cases
+    padding: 0;
+    background-color: transparent;
+    background-image: none;
+    border-style: none;
+    border-color: transparent;
+    box-shadow: none;
+  }
+
+  separator { background-color: $borders_color; }  // FIXME: use darker border?
+
+  @extend %titlebar;
+}
+
+// Development versions of apps to use a differently styled headerbar
+
+window.devel {
+  headerbar.titlebar:not(.selection-mode) {
+    $c: darken($bg_color, 10%);
+    $gradient: cross-fade(10% -gtk-icontheme("system-run-symbolic"), image(transparent)) 90% 0/256px 256px no-repeat,
+               linear-gradient(to right, transparent 65%, transparentize($selected_bg_color, 0.8)),
+               linear-gradient(to top, darken($c, 3%), $c 3px, lighten($c, 6%));
+    @if $variant == 'dark' {
+      $gradient: cross-fade(10% -gtk-icontheme("system-run-symbolic"), image(transparent)) 90% 0/256px 256px no-repeat,
+                 linear-gradient(to right, transparent 65%, transparentize($selected_bg_color, 0.9)),
+                 linear-gradient(to top, lighten($c, 3%) 3px, lighten($c, 5%));
+    }
+
+    background: $bg_color $gradient;
+
+    &:backdrop {
+      background: $bg_color cross-fade(10% -gtk-icontheme("system-run-symbolic"), image(transparent)) 90% 0/256px 256px no-repeat,
+                  image($bg_color); /* background-color would flash */
+    }
+  }
+}
+
+/************
+ * Pathbars *
+ ************/
+
+// GtkPathBar does not work with just .linked, so we must override that. But we
+// can’t simply remove .linked from the widget as that might break other themes.
+// Note also we select on filechooser to avoid interfering with NautilusPathBar.
+filechooser .path-bar.linked > button {
+  @extend %linked_flippable;
+}
+
+.path-bar button {
+  &.text-button, &.image-button, & {
+    padding-left: 4px;
+    padding-right: 4px;
+  }
+
+  &.text-button.image-button label {
+    padding-left: 0;
+    padding-right: 0;
+  }
+
+  &.text-button.image-button, & {
+    label:last-child { padding-right: 8px; }
+    label:first-child { padding-left: 8px; }
+  }
+
+  image {
+    padding-left: 4px;
+    padding-right: 4px;
+  }
+
+  &.slider-button {
+    padding-left: 0;
+    padding-right: 0;
+  }
+}
+
+
+/**************
+ * Tree Views *
+ **************/
+
+$_treeview_borders_color: if($variant=='light',mix($borders_color, $base_color,80%),mix($fg_color, $base_color, 20%));
+
+treeview.view {
+  @at-root * {
+    -GtkTreeView-horizontal-separator: 4;
+    -GtkTreeView-grid-line-width: 1;
+    -GtkTreeView-grid-line-pattern: '';
+    -GtkTreeView-tree-line-width: 1;
+    -GtkTreeView-tree-line-pattern: '';
+    -GtkTreeView-expander-size: 16;
+   }
+
+  border-left-color: mix($fg_color, $base_color, 50%); // this is actually the tree lines color,
+  border-top-color: $bg_color;                         // while this is the grid lines color, better then nothing
+
+  rubberband { @extend rubberband; } // to avoid borders being overridden by the previously set props
+
+  &:selected {
+    &:focus, & {
+      border-radius: 0;
+
+      @extend %selected_items;
+    }
+
+    &:backdrop, & {
+      border-left-color: mix($selected_fg_color, $selected_bg_color, 50%);
+      border-top-color: transparentize($fg_color, 0.9); // doesn't work unfortunatelly
+    }
+  }
+
+  &:disabled {
+    color: $insensitive_fg_color;
+
+    &:selected {
+      color: mix($selected_fg_color, $selected_bg_color, 40%);
+      &:backdrop { color: mix($backdrop_selected_fg_color, $selected_bg_color, 30%); }
+    }
+
+    &:backdrop { color: $backdrop_insensitive_color; }
+  }
+
+  &.separator {
+    min-height: 2px;
+    color: $bg_color;
+
+    &:backdrop { color: transparentize($bg_color, 0.9); }
+  }
+
+  &:backdrop {
+    border-left-color: mix($backdrop_fg_color, $backdrop_bg_color, 50%);
+    border-top: $backdrop_bg_color;
+  }
+  &:drop(active) {
+    border-style: solid none;
+    border-width: 1px;
+    border-color: $selected_borders_color;
+
+    &.after { border-top-style: none; }
+
+    &.before { border-bottom-style: none; }
+  }
+
+  &.expander {
+    -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
+
+    &:dir(rtl) { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic-rtl'); }
+
+    color: mix($text_color, $base_color, 70%);
+
+    &:hover { color: $text_color; }
+
+    &:selected {
+      color: mix($selected_fg_color, $selected_bg_color, 70%);
+
+      &:hover { color: $selected_fg_color; }
+
+      &:backdrop { color: mix($backdrop_selected_fg_color, $selected_bg_color, 70%); }
+    }
+
+    &:checked { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }
+
+    &:backdrop { color: mix($backdrop_fg_color, $backdrop_base_color, 70%); }
+  }
+
+  &.progressbar { // progress bar in treeviews
+    @if $variant == light { color: $base_color; }
+
+    background-color: $progress_bg_color;
+    background-image: image($progress_bg_color);
+    box-shadow: none;
+
+    &:selected {
+      &:focus, & {
+
+        @if $variant == 'light' {
+          color: $selected_bg_color;
+
+        }
+
+        @else { box-shadow: inset 0 1px transparentize(white, 0.95); }
+
+        background-image: image($base_color);
+
+        &:backdrop {
+          @if $variant == 'light' {
+            color: $selected_bg_color;
+          }
+          background-color: $backdrop_base_color;
+        }
+      }
+    }
+
+    &:backdrop {
+      @if $variant == 'light' { color: $backdrop_base_color; }
+
+      @else { border-color: $backdrop_base_color; }
+      background-image: none;
+      box-shadow: none;
+    }
+  }
+
+  &.trough { // progress bar trough in treeviews
+    background-color: transparentize($fg_color,0.9);
+
+    &:selected {
+      &:focus, & {
+        background-color: if($variant == 'light',
+                             transparentize($selected_fg_color, 0.7),
+                             darken($selected_bg_color, 10%));
+
+      }
+    }
+  }
+
+  header {
+    button {
+      $_column_header_color: mix($fg_color, $base_color, 50%);
+
+      @extend %column_header_button;
+
+      color: $_column_header_color;
+      background-color: $base_color;
+      font-weight: bold;
+      text-shadow: none;
+      box-shadow: none;
+
+      &:hover {
+        @extend %column_header_button;
+
+        color: mix($_column_header_color, $fg_color, 50%);
+        box-shadow: none;
+        transition: none; //I shouldn't need this
+      }
+
+      &:active {
+        @extend %column_header_button;
+
+        color: $fg_color;
+        transition: none; //I shouldn't need this
+      }
+    }
+  }
+
+  button.dnd,
+  header.button.dnd { // for treeview-like derive widgets
+    &:active, &:selected, &:hover, & {
+      padding: 0 6px;
+      color: $base_color;
+      background-image: none;
+      background-color: $selected_bg_color;
+      border-style: none;
+      border-radius: 0;
+      box-shadow: inset 0 0 0 1px $base_color;
+      text-shadow: none;
+      transition: none;
+    }
+  }
+
+  acceleditor > label { background-color: $selected_bg_color; } // see tests/testaccel to test
+}
+
+%column_header_button {
+  padding: 0 6px;
+  background-image: none;
+  border-style: none solid solid none;
+  border-color: $_treeview_borders_color;
+  border-radius: 0;
+  text-shadow: none;
+
+  &:disabled {
+    border-color: $bg_color;
+    background-image: none;
+  }
+
+  &:backdrop {
+    color: mix($backdrop_fg_color, $backdrop_bg_color, 50%);
+    border-color: $backdrop_bg_color;
+    border-style: none solid solid none;
+    background-image: none;
+    background-color: $backdrop_base_color;
+
+    &:disabled {
+      border-color: $backdrop_bg_color;
+      background-image: none;
+    }
+  }
+
+  &:last-child { &:backdrop, & { border-right-style: none; }}
+}
+
+
+
+/*********
+ * Menus *
+ *********/
+menubar,
+.menubar {
+  -GtkWidget-window-dragging: true;
+  padding: 0px;
+  box-shadow: inset 0 -1px transparentize(black, 0.9);
+
+  &:backdrop { background-color: $backdrop_bg_color; }
+
+  > menuitem {
+    min-height: 16px;
+    padding: 4px 8px;
+
+    // remove padding and rounding from menubar submenus
+    menu {
+      &:dir(rtl), &:dir(ltr) { // specificity bump
+        border-radius: 0;
+        padding: 0;
+      }
+    }
+
+    &:hover { //Seems like it :hover even with keyboard focus
+      box-shadow: inset 0 -3px $selected_bg_color;
+      color: $link_color;
+    }
+
+    &:disabled {
+      color: $insensitive_fg_color;
+      box-shadow: none;
+    }
+  }
+
+  // remove padding and rounding from menubar submenu decoration
+  .csd.popup decoration {border-radius:0;}
+}
+
+// Needed to make the border-radius of menus work
+// otherwise the background bleeds out of the menu edges
+.background.popup { background-color: transparent; }
+
+menu,
+.menu,
+.context-menu {
+  margin: 4px; // see https://bugzilla.gnome.org/show_bug.cgi?id=591258
+  padding: 4px 0px;
+  background-color: $menu_color;
+  border: 1px solid $borders_color; // adds borders in a non composited env
+
+  .csd & {
+    border: none; // axes borders in a composited env
+    border-radius: $menu_radius;
+  }
+
+  &:backdrop { background-color: $backdrop_menu_color; }
+
+  menuitem {
+    min-height: 16px;
+    min-width: 40px;
+    padding: 4px 6px;
+    text-shadow: none;
+
+    &:hover {
+      color: $selected_fg_color;
+      background-color: $selected_bg_color;
+    }
+
+    &:disabled {
+      color: $insensitive_fg_color;
+      &:backdrop { color: $backdrop_insensitive_color; }
+    }
+
+    &:backdrop,
+    &:backdrop:hover {
+      color: $backdrop_fg_color;
+      background-color: transparent;
+    }
+
+    // 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;
+      }
+    }
+
+    // avoids labels color being overridden, see
+    // https://bugzilla.gnome.org/show_bug.cgi?id=767058
+    label { &:dir(rtl), &:dir(ltr) { color: inherit; }}
+  }
+
+  // overflow arrows
+  > arrow {
+    @include button(undecorated);
+
+    min-height: 16px;
+    min-width: 16px;
+    padding: 4px;
+    background-color: $menu_color;
+    border-radius: 0;
+
+    &.top {
+      margin-top: -4px;
+      border-bottom: 1px solid mix($fg_color, $base_color, 10%);
+      border-top-right-radius: $menu_radius;
+      border-top-left-radius: $menu_radius;
+      -gtk-icon-source: -gtk-icontheme('pan-up-symbolic');
+    }
+
+    &.bottom {
+      margin-top: 8px;
+      margin-bottom: -12px;
+      border-top: 1px solid mix($fg_color, $base_color, 10%);
+      border-bottom-right-radius: $menu_radius;
+      border-bottom-left-radius: $menu_radius;
+      -gtk-icon-source: -gtk-icontheme('pan-down-symbolic');
+    }
+
+    &:hover { background-color: mix($fg_color, $base_color, 10%); }
+
+    &:backdrop { background-color: $backdrop_menu_color; }
+
+    &:disabled {
+      color: transparent;
+      background-color: transparent;
+      border-color: transparent ;
+    }
+  }
+}
+
+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; }
+  }
+}
+
+/***************
+ * Popovers   *
+ ***************/
+
+popover.background {
+  padding: 2px;
+  background-color: $popover_bg_color;
+
+  .csd &, & {
+    border: 1px solid $borders_color;
+    border-radius: $popover_radius;
+  }
+
+  .csd & {
+    $_popover_border: if($variant=='light', transparentize(black, 0.77), transparentize(black, 0.25));
+
+    background-clip: padding-box;
+    border-color: $_popover_border;
+  }
+
+  box-shadow: 0 1px 2px transparentize(black, 0.7);
+
+  &:backdrop {
+    background-color: $backdrop_bg_color;
+    box-shadow: none;
+  }
+
+  > list,
+  > .view,
+  > toolbar {
+    border-style: none;
+    background-color: transparent;
+  }
+
+  .csd &, & {
+    &.touch-selection,
+    &.magnifier {
+      @extend %osd;
+
+      border: 1px solid transparentize(white, 0.9);
+
+      button { @extend %osd_button };
+    }
+
+    &.osd { @extend %osd; }
+  }
+
+  separator { margin: 3px; }
+
+  list separator { margin: 0px; }
+}
+
+/*************
+ * Notebooks *
+ *************/
+notebook {
+  > header {
+    padding: 1px;
+    border-color: $borders_color;
+    border-width: 1px;
+    background-color: $dark_fill;
+
+    &:backdrop {
+      border-color: $backdrop_borders_color;
+      background-color: $backdrop_dark_fill;
+    }
+
+    tabs { margin: -1px; }
+
+    &.top {
+      border-bottom-style: solid;
+      > tabs {
+        margin-bottom: -2px;
+        > tab {
+          &:hover { box-shadow: inset 0 -4px $borders_color; }
+
+          &:backdrop { box-shadow: none; }
+
+          &:checked { box-shadow: inset 0 -4px $selected_bg_color; }
+        }
+      }
+    }
+
+    &.bottom {
+      border-top-style: solid;
+      > tabs {
+        margin-top: -2px;
+        > tab {
+          &:hover { box-shadow: inset 0 4px $borders_color; }
+
+          &:backdrop { box-shadow: none; }
+
+          &:checked { box-shadow: inset 0 4px $selected_bg_color; }
+        }
+      }
+    }
+
+    &.left {
+      border-right-style: solid;
+      > tabs {
+        margin-right: -2px;
+        > tab {
+          &:hover { box-shadow: inset -4px 0 $borders_color; }
+
+          &:backdrop { box-shadow: none; }
+
+          &:checked { box-shadow: inset -4px 0 $selected_bg_color; }
+        }
+      }
+    }
+
+    &.right {
+      border-left-style: solid;
+      > tabs {
+        margin-left: -2px;
+        > tab {
+          &:hover { box-shadow: inset 4px 0 $borders_color; }
+
+          &:backdrop { box-shadow: none; }
+
+          &:checked { box-shadow: inset 4px 0 $selected_bg_color; }
+        }
+      }
+    }
+
+    &.top > tabs > arrow {
+      @extend %notebook_vert_arrows;
+
+      border-top-style: none;
+    }
+
+    &.bottom > tabs > arrow {
+      @extend %notebook_vert_arrows;
+
+      border-bottom-style: none;
+    }
+
+    @at-root %notebook_vert_arrows {
+      margin-left: -5px;
+      margin-right: -5px;
+      padding-left: 4px;
+      padding-right: 4px;
+
+      &.down { -gtk-icon-source: -gtk-icontheme('pan-start-symbolic'); }
+
+      &.up { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic'); }
+    }
+
+    &.left > tabs > arrow {
+      @extend %notebook_horz_arrows;
+
+      border-left-style: none;
+    }
+
+    &.right > tabs > arrow {
+      @extend %notebook_horz_arrows;
+
+      border-right-style: none;
+    }
+
+    @at-root %notebook_horz_arrows {
+      margin-top: -5px;
+      margin-bottom: -5px;
+      padding-top: 4px;
+      padding-bottom: 4px;
+
+      &.down { -gtk-icon-source: -gtk-icontheme('pan-up-symbolic'); }
+
+      &.up { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }
+    }
+
+    > tabs > arrow {
+      @extend %button_basic;
+
+      @extend %button_basic_flat;
+
+      min-height: 16px;
+      min-width: 16px;
+      border-radius: 0;
+
+      &:hover:not(:active):not(:backdrop) {
+        background-clip: padding-box;
+        background-image: none;
+        background-color: transparentize(white, 0.7);
+        border-color: transparent;
+        box-shadow: none;
+      }
+
+      &:disabled { @include button(undecorated); }
+    }
+
+    tab {
+      min-height: 30px;
+      min-width: 30px;
+      padding: 3px 12px;
+
+      outline-offset: -5px;
+
+      color: $fg_color;
+      font-weight: normal;
+
+      border-width: 1px;         // for reorderable tabs
+      border-color: transparent; //
+
+      &:hover {
+        color: $fg_color;
+        background-color: darken($bg_color,4%);
+
+        &.reorderable-page {
+          border-color: transparentize($borders_color, 0.7);
+          background-color: transparentize($bg_color, 0.8);
+        }
+      }
+
+      &:backdrop {
+        color: mix($backdrop_fg_color, $backdrop_bg_color, 60%);
+
+        &.reorderable-page {
+          border-color: transparent;
+          background-color: transparent;
+        }
+      }
+
+      &:checked {
+        color: $fg_color;
+        &.reorderable-page {
+          border-color: transparentize($borders_color, 0.5);
+          background-color: transparentize($bg_color, 0.5);
+
+          &:hover { background-color: transparentize($bg_color, 0.3); }
+        }
+      }
+
+      &:backdrop:checked {
+        color: $backdrop_fg_color;
+
+        &.reorderable-page {
+          border-color: $backdrop_borders_color;
+          background-color: $backdrop_bg_color;
+        }
+      }
+
+      // colors the button like the label, overridden otherwise
+      button.flat {
+        &:hover { color: currentColor; }
+
+        &, &:backdrop { color: gtkalpha(currentColor, 0.3); }
+
+        padding: 0;
+        margin-top: 4px;
+        margin-bottom: 4px;
+        // FIXME: generalize .small-button?
+        min-width: 20px;
+        min-height: 20px;
+
+        &:last-child {
+          margin-left: 4px;
+          margin-right: -4px;
+        }
+
+        &:first-child {
+          margin-left: -4px;
+          margin-right: 4px;
+        }
+      }
+    }
+
+    &.top,
+    &.bottom {
+      tabs {
+        padding-left: 4px;
+        padding-right: 4px;
+
+        &:not(:only-child) {
+          margin-left: 3px;
+          margin-right: 3px;
+
+          &:first-child { margin-left: -1px; }
+          &:last-child { margin-right: -1px; }
+        }
+
+        tab {
+          margin-left: 4px;
+          margin-right: 4px;
+
+          &.reorderable-page { border-style: none solid; }
+        }
+      }
+    }
+
+    &.left,
+    &.right {
+      tabs {
+        padding-top: 4px;
+        padding-bottom: 4px;
+
+        &:not(:only-child) {
+          margin-top: 3px;
+          margin-bottom: 3px;
+
+          &:first-child { margin-top: -1px; }
+          &:last-child { margin-bottom: -1px; }
+        }
+
+        tab {
+          margin-top: 4px;
+          margin-bottom: 4px;
+
+          &.reorderable-page { border-style: solid none; }
+        }
+      }
+    }
+
+    &.top tab { padding-bottom: 4px; }
+    &.bottom tab { padding-top: 4px; }
+  }
+
+  > stack:not(:only-child) { // the :not(:only-child) is for "hidden" notebooks
+    background-color: $base_color;
+
+    &:backdrop { background-color: $backdrop_base_color; }
+  }
+}
+
+
+/**************
+ * Scrollbars *
+ **************/
+scrollbar {
+  $_slider_min_length: 40px;
+  $_slider_width: 8px;
+  $_scrollbar_transition: all 300ms $ease-out-quad;
+  $_fine-tune_slider_border: $_slider_width - 3; //3672
+
+  // disable steppers
+  @at-root * {
+    -GtkScrollbar-has-backward-stepper: false;
+    -GtkScrollbar-has-forward-stepper: false;
+  }
+
+  background-color: $scrollbar_bg_color;
+  transition: $_scrollbar_transition;
+
+  // scrollbar border
+  &.top { border-bottom: 1px solid $borders_color; }
+  &.bottom { border-top: 1px solid $borders_color; }
+  &.left { border-right: 1px solid $borders_color; }
+  &.right { border-left: 1px solid $borders_color; }
+
+  &:backdrop {
+    background-color: $backdrop_scrollbar_bg_color;
+    border-color: $backdrop_borders_color;
+    transition: $backdrop_transition;
+  }
+
+  // slider
+  slider {
+    min-width: $_slider_width;
+    min-height: $_slider_width;
+    margin: -1px;
+    border: 4px solid transparent;
+    border-radius: 10px;
+    background-clip: padding-box;
+    background-color: $scrollbar_slider_color;
+    transition: $_scrollbar_transition;
+
+    &:hover { background-color: $scrollbar_slider_hover_color; }
+
+    &:hover:active { background-color: $scrollbar_slider_active_color; }
+
+    &:backdrop { background-color: $backdrop_scrollbar_slider_color; }
+
+    &:disabled { background-color: transparent; }
+  }
+
+  &.fine-tune {
+    slider {
+      transition: none;
+      min-width: $_fine-tune_slider_border+1;
+      min-height: $_fine-tune_slider_border+1;
+    }
+
+    &.horizontal slider { border-width: $_fine-tune_slider_border 4px; }
+    &.vertical slider { border-width: 4px $_fine-tune_slider_border; }
+  }
+
+  &.overlay-indicator {
+    &:not(.dragging):not(.hovering) {
+      border-color: transparent;
+      opacity: 0.4;
+      background-color: transparent;
+
+      slider {
+        margin: 0;
+        min-width: 3px;
+        min-height: 3px;
+        background-color: $fg_color;
+        border: 1px solid if($variant == 'light', white, black);
+      }
+
+      button {
+        min-width: 5px;
+        min-height: 5px;
+        background-color: $fg_color;
+        background-clip: padding-box;
+        border-radius: 100%;
+        border: 1px solid if($variant == 'light', white, black);
+        -gtk-icon-source: none;
+      }
+
+      &.horizontal {
+        slider {
+          margin: 0 2px;
+          min-width: $_slider_min_length;
+        }
+
+        button {
+          margin: 1px 2px;
+          min-width: 5px;
+        }
+      }
+
+      &.vertical {
+        slider {
+          margin: 2px 0;
+          min-height: $_slider_min_length;
+        }
+
+        button {
+          margin: 2px 1px;
+          min-height: 5px;
+        }
+      }
+    }
+
+    &.dragging,
+    &.hovering { opacity: 0.8; }
+  }
+
+  &.horizontal slider { min-width: $_slider_min_length; }
+
+  &.vertical slider { min-height: $_slider_min_length; }
+
+  // button styling
+  button {
+    padding: 0;
+    min-width: 12px;
+    min-height: 12px;
+    border-style: none;
+    border-radius: 0;
+    transition-property: min-height, min-width, color;
+
+    @include button(undecorated);
+
+    color: $scrollbar_slider_color;
+
+    &:hover {
+      @include button(undecorated);
+
+      color: $scrollbar_slider_hover_color;
+    }
+    &:active, &:checked {
+      @include button(undecorated);
+
+      color: $scrollbar_slider_active_color;
+    }
+    &:disabled {
+      @include button(undecorated);
+
+      color: transparentize($scrollbar_slider_color, 0.8);
+    }
+    &:backdrop {
+      @include button(undecorated);
+
+      color: $backdrop_scrollbar_slider_color;
+
+      &:disabled {
+        @include button(undecorated);
+
+        color: transparentize($backdrop_scrollbar_slider_color, 0.8);
+      }
+    }
+  }
+
+  // button icons
+  &.vertical {
+    button {
+      &.down { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }
+
+      &.up { -gtk-icon-source: -gtk-icontheme('pan-up-symbolic'); }
+    }
+  }
+
+  &.horizontal {
+    button {
+      &.down { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic'); }
+
+      &.up { -gtk-icon-source: -gtk-icontheme('pan-start-symbolic'); }
+    }
+  }
+}
+
+treeview ~ scrollbar.vertical {
+  border-top: 1px solid $borders_color;
+  margin-top: -1px;
+}
+
+/**********
+ * Switch *
+ **********/
+switch {
+  outline-offset: -4px;
+
+  // similar to the .scale
+  border: 1px solid $borders_color;
+  border-radius: 14px;
+  color: $fg_color;
+  background-color: $dark_fill;
+  text-shadow: 0 1px transparentize(black, 0.9);
+
+  &:checked {
+    color: $selected_fg_color;
+    border-color: $checkradio_borders_color;
+    background-color: $checkradio_bg_color;
+    text-shadow: 0 1px transparentize($selected_borders_color, 0.5),
+                 0 0 2px transparentize(white, 0.4);
+  }
+
+  &:disabled {
+    color: $insensitive_fg_color;
+    border-color: $borders_color;
+    background-color: $insensitive_bg_color;
+    text-shadow: none;
+  }
+
+  &:backdrop {
+    color: $backdrop_fg_color;
+    border-color: $backdrop_borders_color;
+    background-color: $backdrop_dark_fill;
+    text-shadow: none;
+    transition: $backdrop_transition;
+
+    &:checked {
+      @if $variant == 'light' { color: $backdrop_bg_color; }
+      border-color: if($variant == 'light', $checkradio_borders_color,
+                                            $selected_borders_color);
+      background-color: $checkradio_bg_color;
+    }
+
+    &:disabled {
+      color: $backdrop_insensitive_color;
+      border-color: $backdrop_borders_color;
+      background-color: $insensitive_bg_color;
+    }
+  }
+
+  slider {
+    margin: -1px;
+    min-width: 24px;
+    min-height: 24px;
+    border: 1px solid;
+    border-radius: 50%;
+    transition: $button_transition;
+    -gtk-outline-radius: 20px;
+
+    @if $variant == 'light' {
+      @include button(normal-alt, $edge: $shadow_color);
+    } 
+    @else {
+      @include button(normal-alt, $c: lighten($bg_color,6%), $edge: $shadow_color);
+    }
+  }
+  
+  image { color: transparent; } /* only show i / o for the accessible theme */
+
+  &:hover slider {
+    @if $variant == 'light' {
+      @include button(hover-alt, $edge: $shadow_color);
+    }
+    @else {
+      @include button(hover-alt, $c: lighten($bg_color,6%), $edge: $shadow_color);
+    }
+  }
+
+  &:checked > slider { border: 1px solid $checkradio_borders_color; }
+
+  &:disabled slider { @include button(insensitive); }
+
+  &:backdrop {
+    slider {
+      transition: $backdrop_transition;
+
+      @include button(backdrop);
+    }
+
+    &:checked > slider { border-color: $checkradio_borders_color; }
+
+    &:disabled slider { @include button(backdrop-insensitive); }
+  }
+
+  row:selected & {
+    @if $variant == 'light' {
+      box-shadow: none;
+      border-color: $checkradio_borders_color;
+
+      &:backdrop { border-color: $checkradio_borders_color; }
+
+      > slider { &:checked, & { border-color: $checkradio_borders_color; } }
+    }
+  }
+
+}
+
+
+/*************************
+ * Check and Radio items *
+ *************************/
+// draw regular check and radio items using our PNG assets
+// all assets are rendered from assets.svg. never add pngs directly
+
+
+//selection-mode
+@each $check_state, $check_icon, $check_color, $check_background in
+  ('', 'none', 'transparent', $checkradio_bg_color),
+  (':hover', 'none', 'transparent', $checkradio_bg_color),
+  (':active', 'none', 'transparent', $checkradio_bg_color),
+  (':backdrop', 'none', 'transparent', '#{desaturate($checkradio_bg_color, 100%)}'),
+  (':checked', '-gtk-icontheme(\'object-select-symbolic\')', $osd_fg_color, $checkradio_bg_color),
+  (':checked:hover', '-gtk-icontheme(\'object-select-symbolic\')', $osd_fg_color, $checkradio_bg_color),
+  (':checked:active', '-gtk-icontheme(\'object-select-symbolic\')', $osd_fg_color, $checkradio_bg_color),
+  (':backdrop:checked', '-gtk-icontheme(\'object-select-symbolic\')', '#{transparentize($osd_fg_color, 0.2)}', '#{desaturate($checkradio_bg_color, 100%)}'), {
+
+  .view.content-view.check#{$check_state}:not(list),
+  .content-view:not(list) check#{$check_state} {
+    margin: 4px;
+    min-width: 32px;
+    min-height: 32px;
+    color: #{$check_color};
+    background-color: #{$check_background};
+    border-radius: 5px;
+    background-image: none;
+    transition: 200ms;
+    box-shadow: none;
+    border-width: 0;
+    -gtk-icon-source: #{$check_icon};
+    -gtk-icon-shadow: none;
+  }
+}
+
+checkbutton.text-button, radiobutton.text-button {
+  // this is for a nice focus on check and radios text
+  padding: 2px 0;
+  outline-offset: 0;
+
+  label:not(:only-child) {
+    &:first-child { margin-left: 4px; }
+    &:last-child { margin-right: 4px; }
+  }
+}
+
+check,
+radio {
+  margin: 0 4px;
+
+  &:only-child { margin: 0; }
+
+  popover & { // when in a popover add more space between the label and the check, reset the other side margin.
+              // See https://bugzilla.gnome.org/show_bug.cgi?id=779570 for details.
+    &.left:dir(rtl) {
+      margin-left: 0;
+      margin-right: 12px;
+    }
+
+    &.right:dir(ltr) {
+      margin-left: 12px;
+      margin-right: 0;
+    }
+  }
+
+  min-height: 14px;
+  min-width: 14px;
+  border: 1px solid;
+  -gtk-icon-source: none;
+
+  & {
+    // for unchecked
+    $_c: if($variant=='light', white, $bg_color);
+
+    @each $state, $t in ("", "normal"),
+                        (":hover", "hover"),
+                        (":active", "active"),
+                        (":disabled", "insensitive"),
+                        (":backdrop", "backdrop"),
+                        (":backdrop:disabled", 'backdrop-insensitive') {
+      &#{$state} {
+        @include check($t, $_c);
+      }
+    }
+  }
+
+  & {
+    // for checked
+    @each $t in (':checked'), (':indeterminate') {
+      &#{$t} {
+        @each $state, $t in ("", "normal"),
+                            (":hover", "hover"),
+                            (":active", "active"),
+                            (":disabled", "insensitive"),
+                            (":backdrop", "backdrop"),
+                            (":backdrop:disabled", 'backdrop-insensitive') {
+          &#{$state} {
+            @include check($t, $checkradio_bg_color, $checkradio_fg_color, $checked: true);
+          }
+        }
+      }
+    }
+  }
+
+  &:backdrop { transition: $backdrop_transition; }
+  
+  @if $variant == 'light' {
+    // the borders of the light variant versions of checks and radios are too similar in luminosity to the selected background
+    // color, hence we need special casing.
+    row:selected & { border-color: $checkradio_borders_color; }
+  }
+
+  .osd & {
+    @include button(osd);
+
+    &:hover { @include button(osd); }
+    &:active { @include button(osd-active); }
+    &:backdrop { @include button(osd-backdrop); }
+    &:disabled { @include button(osd-insensitive); }
+  }
+
+  menu menuitem & {
+    margin: 0; // this is a workaround for a menu check/radio size allocation issue
+
+    &, &:checked, &:indeterminate {
+      &, &:hover, &:disabled { //FIXME use button reset mixin
+        min-height: 14px;
+        min-width: 14px;
+        background-image: none;
+        background-color: transparent;
+        box-shadow: none;
+        -gtk-icon-shadow: none;
+        color: inherit;
+        border-color: currentColor;
+      }
+    }
+  }
+}
+
+%check,
+check {
+  border-radius: 3px;
+
+  &:checked { -gtk-icon-source: image(-gtk-recolor(url("assets/check-symbolic.svg")),
+                                      -gtk-recolor(url("assets/check-symbolic.symbolic.png"))); }
+
+  &:indeterminate { -gtk-icon-source: image(-gtk-recolor(url("assets/dash-symbolic.svg")),
+                                            -gtk-recolor(url("assets/dash-symbolic.symbolic.png"))); }
+}
+
+%radio,
+radio {
+  border-radius: 100%;
+
+  &:checked { -gtk-icon-source: image(-gtk-recolor(url("assets/bullet-symbolic.svg")),
+                                      -gtk-recolor(url("assets/bullet-symbolic.symbolic.png"))); }
+
+  &:indeterminate { -gtk-icon-source: image(-gtk-recolor(url("assets/dash-symbolic.svg")),
+                                            -gtk-recolor(url("assets/dash-symbolic.symbolic.png"))); }
+}
+
+// ANIMATION:
+// this is made with those pretty convoluted transitions, since checks and radios have to animate only on state changes,
+// the transformation is set on the active state and it get reset on the checked state.
+radio:not(:indeterminate):not(:checked):active:not(:backdrop) { -gtk-icon-transform: scale(0); }
+
+check:not(:indeterminate):not(:checked):active:not(:backdrop) { -gtk-icon-transform: translate(6px, -3px) rotate(-45deg) scaleY(0.2) rotate(45deg) scaleX(0); }
+
+radio,
+check {
+  &:active { -gtk-icon-transform: scale(0, 1); } // should tackle the indeterminate state, untested
+
+  &:checked:not(:backdrop), &:indeterminate:not(:backdrop) {
+    -gtk-icon-transform: unset;
+    transition: 400ms;
+  }
+}
+
+menu menuitem {
+  radio,
+  check {
+     &:checked:not(:backdrop), &:indeterminate:not(:backdrop) { transition: none; }
+  }
+}
+
+treeview.view check,
+treeview.view radio {
+  &:selected {
+    &:focus, & {
+      color: $checkradio_fg_color;
+
+      @if $variant == 'light' { border-color: $selected_borders_color; }
+    }
+  }
+}
+
+treeview.view radio:selected { &:focus, & { @extend %radio; }} // This is a workaround
+
+
+/************
+ * GtkScale *
+ ************/
+%scale_trough {
+  border: 1px solid $borders_color;
+  border-radius: 3px;
+  background-color: $dark_fill;
+
+  &:disabled { background-color: $insensitive_bg_color; }
+
+  &:backdrop {
+    background-color: $backdrop_dark_fill;
+    border-color: $backdrop_borders_color;
+    transition: $backdrop_transition;
+
+    &:disabled { background-color: $insensitive_bg_color; }
+  }
+
+  // ...on selected list rows
+  row:selected & { &:disabled, & { border-color: $selected_borders_color; }}
+
+  // OSD
+  .osd & {
+    border-color: $osd_borders_color;
+    background-color: transparentize($osd_borders_color, 0.2);
+
+    &:disabled { background-color: $osd_insensitive_bg_color; }
+  }
+}
+
+%scale_highlight {
+  border: 1px solid $progress_border_color;
+  border-radius: 3px;
+  background-color: $progress_bg_color;
+
+  &:disabled {
+    background-color: transparent;
+    border-color: transparent;
+  }
+
+  &:backdrop {
+    border-color: if($variant=='light', $progress_bg_color,
+                                        $progress_border_color);
+    &:disabled {
+      background-color: transparent;
+      border-color: transparent;
+    }
+  }
+
+  // ...on selected list rows
+  row:selected & { &:disabled, & { border-color: $selected_borders_color; }}
+
+  // OSD
+  .osd & {
+    border-color: $osd_borders_color;
+
+    &:disabled { border-color: transparent; }
+  }
+}
+
+scale {
+  // sizing
+  $_marks_length: 6px;
+  $_marks_distance: 6px;
+
+  min-height: 10px;
+  min-width: 10px;
+  padding: 12px;
+
+  // those are inside the trough node, I need them to show their own border over the trough one, so negative margin
+  fill,
+  highlight { margin: -1px; }
+
+  // the slider is inside the trough, so to have make it bigger there's a negative margin
+
+  slider {
+    min-height: 18px;
+    min-width: 18px;
+    margin: -9px;
+  }
+
+  // click-and-hold the slider to activate
+  &.fine-tune {
+    &.horizontal {
+      padding-top: 9px;
+      padding-bottom: 9px;
+      min-height: 16px;
+    }
+
+    &.vertical {
+      padding-left: 9px;
+      padding-right: 9px;
+      min-width: 16px;
+    }
+
+    // to make the trough grow in fine-tune mode
+    slider { margin: -6px; }
+
+    fill,
+    highlight,
+    trough {
+      border-radius: 5px;
+      -gtk-outline-radius: 7px;
+    }
+  }
+
+  // the backing bit
+  trough {
+    @extend %scale_trough;
+
+    outline-offset: 2px;
+    -gtk-outline-radius: 5px;
+  }
+
+  // the colored part of the backing bit
+  highlight { @extend %scale_highlight; }
+
+  // this is another differently styled part of the backing bit, the most relevant use case is for example
+  // in media player to indicate how much video stream as been cached
+  fill {
+    @extend %scale_trough;
+
+    &:backdrop, & { background-color: $borders_color; }
+
+    &:disabled {
+      &:backdrop, & {
+        border-color: transparent;
+        background-color: transparent;
+      }
+    }
+
+    // OSD
+    .osd & {
+      background-color: mix($osd_fg_color, $osd_borders_color, 25%);
+
+      &:disabled {
+        &:backdrop, & {
+          border-color: transparent;
+          background-color: transparent;
+        }
+      }
+    }
+  }
+
+  slider {
+    @include button(normal-alt, $edge: $shadow_color);
+
+    border: 1px solid darken($alt_borders_color, 3%);
+    border-radius: 100%;
+    transition: $button_transition;
+    transition-property: background, border, box-shadow;
+
+    &:hover { @include button(hover-alt, $edge: $shadow_color); }
+
+    &:active { border-color: $progress_border_color; }
+
+    &:disabled { @include button(insensitive); }
+
+    &:backdrop {
+      transition: $backdrop_transition;
+
+      @include button(backdrop);
+
+      &:disabled { @include button(backdrop-insensitive); }
+    }
+
+    // ...on selected list rows
+    row:selected & { &:disabled, & { border-color: $selected_borders_color; } }
+
+    // OSD
+    .osd & {
+      @include button(osd);
+      border-color: darken($osd_borders_color, 3%);
+      background-color: opacify($osd_bg_color, 1); // solid background needed here
+
+      &:hover {
+        @include button(osd-hover);
+        background-color: opacify($osd_bg_color, 1); // solid background needed here
+      }
+
+      &:active {
+        @include button(osd-active);
+        background-color: opacify($osd_bg_color, 1); // solid background needed here
+      }
+
+      &:disabled {
+        @include button(osd-insensitive);
+        background-color: opacify($osd_bg_color, 1); // solid background needed here
+      }
+
+      &:backdrop {
+        @include button(osd-backdrop);
+        background-color: opacify($osd_bg_color, 1); // solid background needed here
+
+        &:disabled {
+          @include button(osd-backdrop-insensitive);
+          background-color: opacify($osd_bg_color, 1); // solid background needed here
+        }
+      }
+    }
+  }
+
+  marks,
+  value {
+    color: gtkalpha(currentColor, 0.55);
+    font-feature-settings: "tnum";
+  }
+
+  //marks margins
+  @each $scale_orient, $marks_class, $marks_pos, $marks_margin in (horizontal, top, top, bottom),
+                                                                  (horizontal, bottom, bottom, top),
+                                                                  (vertical, top, left, right),
+                                                                  (vertical, bottom, right, left) {
+    &.#{$scale_orient} marks {
+      &.#{$marks_class} {
+        margin-#{$marks_margin}: $_marks_distance;
+        margin-#{$marks_pos}: -($_marks_distance + $_marks_length);
+      }
+    }
+
+    &.#{$scale_orient}.fine-tune marks {
+      &.#{$marks_class} {
+        margin-#{$marks_margin}: $_marks_distance;
+        margin-#{$marks_pos}: -($_marks_distance + $_marks_length - 3px);
+      }
+    }
+  }
+
+  &.horizontal {
+    indicator {
+      min-height: $_marks_length;
+      min-width: 1px;
+    }
+
+    &.fine-tune indicator { min-height: ($_marks_length - 3px); }
+  }
+
+  &.vertical {
+    indicator {
+      min-height: 1px;
+      min-width: $_marks_length;
+    }
+
+    &.fine-tune indicator { min-width: ($_marks_length - 3px); }
+  }
+
+  // *WARNING* scale with marks madness following
+
+  // FIXME: OSD and selected list rows missing, I don't feel like adding the other 144 assets needed for those...
+  $suffix: if($variant == 'light', '', '-dark');
+
+  @each $dir_class, $dir_infix in ('horizontal', 'horz'),
+                                  ('vertical', 'vert') {
+    @each $marks_infix, $marks_class in ('scale-has-marks-above', 'marks-before:not(.marks-after)'),
+                                        ('scale-has-marks-below', 'marks-after:not(.marks-before)') {
+      @each $state, $state_infix in ('', ''),
+                                    (':hover', '-hover'),
+                                    (':active', '-active'),
+                                    (':disabled', '-insensitive'),
+                                    (':backdrop', '-backdrop'),
+                                    (':backdrop:disabled', '-backdrop-insensitive') {
+        &.#{$dir_class}.#{$marks_class} {
+
+          slider {
+            &#{$state} {
+              // an asymmetric slider asset is used here, so the margins are uneven, the smaller
+              // margin is set on the point side.
+              margin: -10px;
+              $_scale_asset: 'assets/slider-#{$dir_infix}-#{$marks_infix}#{$state_infix}#{$suffix}';
+              border-style: none;
+              border-radius: 0;
+
+              background-color: transparent;
+              background-image: -gtk-scaled(url('#{$_scale_asset}.png'), url('#{$_scale_asset}@2.png'));
+
+              $_scale_slider_bg_pos: bottom;
+
+              @if $dir_class == 'horizontal' {
+                min-height: 26px;
+                min-width: 22px;
+
+                @if $marks_infix == 'scale-has-marks-above' {
+                  margin-top: -14px;
+
+                  $_scale_slider_bg_pos: top;
+                }
+
+                @else { margin-bottom: -14px; }
+              }
+
+              @else {
+                min-height: 22px;
+                min-width: 26px;
+
+                @if $marks_infix == 'scale-has-marks-above' {
+                  margin-left: -14px;
+
+                  $_scale_slider_bg_pos: left bottom;
+                }
+
+                @else {
+                  margin-right: -14px;
+
+                  $_scale_slider_bg_pos: right bottom;
+                }
+              }
+
+              background-position: $_scale_slider_bg_pos;
+              background-repeat: no-repeat;
+              box-shadow: none;
+            }
+          }
+
+          &.fine-tune slider {
+            // bigger negative margins to make the trough grow here as well
+            margin: -7px;
+
+            @if $dir_class == 'horizontal' {
+              @if $marks_infix == 'scale-has-marks-above' { margin-top: -11px; }
+
+              @else { margin-bottom: -11px; }
+            }
+
+            @else {
+              @if $marks_infix == 'scale-has-marks-above' { margin-left: -11px; }
+
+              @else { margin-right: -11px; }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  &.color {
+    min-height: 0;
+    min-width: 0;
+
+    trough {
+      background-image: image($borders_color);
+      background-repeat: no-repeat;
+    }
+
+    &.horizontal {
+      padding: 0 0 15px 0;
+
+      trough {
+        padding-bottom: 4px;
+        background-position: 0 -3px;
+        border-top-left-radius: 0;
+        border-top-right-radius: 0;
+      }
+
+      slider {
+        &:dir(ltr), &:dir(rtl) { // specificity bumb
+          &:hover, &:backdrop, &:disabled, &:backdrop:disabled, & {
+            margin-bottom: -15px;
+            margin-top: 6px;
+          }
+        }
+      }
+    }
+
+    &.vertical {
+      &:dir(ltr) {
+        padding: 0 0 0 15px;
+
+        trough {
+          padding-left: 4px;
+          background-position: 3px 0;
+          border-bottom-right-radius: 0;
+          border-top-right-radius: 0;
+        }
+
+        slider {
+          &:hover, &:backdrop, &:disabled, &:backdrop:disabled, & {
+            margin-left: -15px;
+            margin-right: 6px;
+          }
+        }
+      }
+
+      &:dir(rtl) {
+        padding: 0 15px 0 0;
+
+        trough {
+          padding-right: 4px;
+          background-position: -3px 0;
+          border-bottom-left-radius: 0;
+          border-top-left-radius: 0;
+        }
+
+        slider {
+          &:hover, &:backdrop, &:disabled, &:backdrop:disabled, & {
+            margin-right: -15px;
+            margin-left: 6px;
+          }
+        }
+      }
+    }
+
+    &.fine-tune {
+      &.horizontal {
+        &:dir(ltr), &:dir(rtl) { // specificity bump
+          padding: 0 0 12px 0;
+
+          trough {
+            padding-bottom: 7px;
+            background-position: 0 -6px;
+          }
+
+          slider {
+            margin-bottom: -15px;
+            margin-top: 6px;
+          }
+        }
+      }
+
+      &.vertical {
+        &:dir(ltr) {
+          padding: 0 0 0 12px;
+
+          trough {
+            padding-left: 7px;
+            background-position: 6px 0;
+          }
+
+          slider {
+            margin-left: -15px;
+            margin-right: 6px;
+          }
+        }
+
+        &:dir(rtl) {
+          padding: 0 12px 0 0;
+
+          trough {
+            padding-right: 7px;
+            background-position: -6px 0;
+          }
+
+          slider {
+            margin-right: -15px;
+            margin-left: 6px;
+          }
+        }
+      }
+    }
+  }
+}
+
+
+/*****************
+ * Progress bars *
+ *****************/
+progressbar {
+  // sizing
+  &.horizontal {
+    trough,
+    progress { min-height: 2px; }
+  }
+
+  &.vertical {
+    trough,
+    progress { min-width: 2px; }
+  }
+
+  &.horizontal progress { margin: 0 -1px; } // the progress node is positioned after the trough border
+  &.vertical progress { margin: -1px 0; }   // this moves it over it.
+
+
+  // FIXME: insensitive state missing and some other state should be set probably
+  font-size: smaller;
+  color: transparentize($fg_color, 0.6);
+  font-feature-settings: "tnum";
+
+  &:backdrop {
+    box-shadow: none;
+    transition: $backdrop_transition;
+  }
+
+  trough { @extend %scale_trough; }
+
+  progress {
+    @extend %scale_highlight;
+
+    border-radius: 1.5px;
+
+    &.left {
+      border-top-left-radius: 2px;
+      border-bottom-left-radius: 2px;
+    }
+
+    &.right {
+      border-top-right-radius: 2px;
+      border-bottom-right-radius: 2px;
+    }
+
+    &.top {
+      border-top-right-radius: 2px;
+      border-top-left-radius: 2px;
+    }
+
+    &.bottom {
+      border-bottom-right-radius: 2px;
+      border-bottom-left-radius: 2px;
+    }
+  }
+
+  &.osd { // progressbar.osd used for epiphany page loading progress
+    min-width: 3px;
+    min-height: 3px;
+    background-color: transparent;
+
+    trough {
+      border-style: none;
+      border-radius: 0;
+      background-color: transparent;
+      box-shadow: none;
+    }
+
+    progress {
+      border-style: none;
+      border-radius: 0;
+    }
+  }
+
+  trough.empty progress { all: unset; } // makes the progress indicator disappear, when the fraction is 0
+}
+
+
+/*************
+ * Level Bar *
+ *************/
+levelbar {
+  &.horizontal {
+    block {
+      min-height: 1px;
+    }
+
+    &.discrete block {
+      margin: 0 1px;
+      min-width: 32px;
+    }
+  }
+
+  &.vertical {
+    block {
+      min-width: 1px;
+    }
+
+    &.discrete block {
+      margin: 1px 0;
+      min-height: 32px;
+    }
+  }
+
+  &:backdrop { transition: $backdrop_transition; }
+
+  trough {
+    border: 1px solid;
+    padding: 2px;
+    border-radius: 3px;
+    @include entry(normal);
+
+    &:backdrop { @include entry(backdrop); }
+  }
+
+  block {
+    border: 1px solid;
+    border-radius: 1px;
+
+    &.low {
+      border-color: if($variant == 'light', darken($warning_color, 20%), $warning_color);
+      background-color: $warning_color;
+
+      &:backdrop { border-color: $warning_color; };
+    }
+
+    &.high,
+    &:not(.empty) {
+      border-color: if($variant == 'light', darken($progress_bg_color, 20%), $progress_bg_color);
+      background-color: $progress_bg_color;
+
+      &:backdrop { border-color: $progress_bg_color; }
+    }
+
+    &.full {
+      border-color: if($variant == 'light', darken($success_color, 20%), $success_color);
+      background-color: $success_color;
+
+      &:backdrop { border-color: $success_color; };
+    }
+
+    &.empty {
+      background-color: transparent;
+      border-color: if($variant == 'light', transparentize($fg_color,0.8), transparentize($fg_color,0.9));
+
+      &:backdrop { border-color: transparentize($backdrop_fg_color,0.85); }
+    }
+  }
+}
+
+
+/****************
+ * Print dialog *
+*****************/
+printdialog {
+  paper {
+    color: $fg_color;
+    border: 1px solid $borders_color;
+    background: white;
+    padding: 0;
+
+    &:backdrop {
+      color: $backdrop_fg_color;
+      border-color: $backdrop_borders_color;
+    }
+  }
+
+  .dialog-action-box { margin: 12px; }
+}
+
+
+/**********
+ * Frames *
+ **********/
+frame > border,
+.frame {
+  box-shadow: none;
+  margin: 0;
+  padding: 0;
+  border-radius: 0;
+  border: 1px solid $borders_color;
+
+  &.flat { border-style: none; }
+
+  &:backdrop { border-color: $backdrop_borders_color; }
+}
+
+actionbar > revealer >  box {
+  padding: 6px;
+  border-top: 1px solid $borders_color;
+
+  &:backdrop { border-color: $backdrop_borders_color; }
+}
+
+scrolledwindow {
+  viewport.frame { // avoid double borders when viewport inside scrolled window
+    border-style: none;
+  }
+
+  // This is used when content is touch-dragged past boundaries.
+  // draws a box on top of the content, the size changes programmatically.
+  overshoot {
+    &.top {
+      @include overshoot(top);
+
+      &:backdrop { @include overshoot(top, backdrop); }
+    }
+
+    &.bottom {
+      @include overshoot(bottom);
+
+      &:backdrop { @include overshoot(bottom, backdrop); }
+    }
+
+    &.left {
+      @include overshoot(left);
+
+      &:backdrop { @include overshoot(left, backdrop); }
+    }
+
+    &.right {
+      @include overshoot(right);
+
+      &:backdrop { @include overshoot(right, backdrop); }
+    }
+  }
+
+
+  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; }
+
+    &:backdrop {
+      border-image-source: linear-gradient(to bottom, $backdrop_borders_color 1px, transparent 1px);
+      background-color: $backdrop_scrollbar_bg_color;
+      transition: $backdrop_transition;
+    }
+  }
+}
+
+//vbox and hbox separators
+separator {
+  background: transparentize(black, 0.9);
+  min-width: 1px;
+  min-height: 1px;
+}
+
+
+/*********
+ * Lists *
+ *********/
+list {
+  color: $text_color;
+  background-color: $base_color;
+  border-color: $borders_color;
+
+  &:backdrop {
+    color: $backdrop_text_color;
+    background-color: $backdrop_base_color;
+    border-color: $backdrop_borders_color;
+  }
+
+  row { padding: 2px; }
+}
+
+row {
+  transition: all 150ms $ease-out-quad;
+
+  &:hover { transition: none; }
+
+  &:backdrop { transition: $backdrop_transition; }
+
+  &.activatable {
+    &.has-open-popup, // this is for indicathing which row generated a popover see https://bugzilla.gnome.org/show_bug.cgi?id=754411
+
+    &:hover { background-color: if(variant == light, transparentize($fg_color, 0.9), transparentize($fg_color, 0.95)); }
+
+    &:active { box-shadow: inset 0 2px 2px -2px transparentize(black, 0.8); }
+
+    &:backdrop:hover { background-color: transparent; }
+
+    &:selected {
+      &:active { box-shadow: inset 0 2px 3px -1px transparentize(black, 0.5); }
+
+      &.has-open-popup,
+      &:hover { background-color: mix($fg_color, $selected_bg_color, 10%); }
+
+      &:backdrop { background-color: $selected_bg_color; }
+    }
+  }
+
+  &:selected { @extend %selected_items; }
+}
+
+
+/*********************
+ * App Notifications *
+ *********************/
+.app-notification,
+.app-notification.frame {
+  @extend %osd;
+
+  padding: 10px;
+  border-radius: 0 0 5px 5px;
+  background-color: $osd_bg_color;
+  background-image: linear-gradient(to bottom, transparentize(black, 0.8),
+                                               transparent 2px);
+  background-clip: padding-box;
+
+  &:backdrop {
+    background-image: none;
+    transition: $backdrop_transition;
+  }
+
+  button { @extend %osd_button; }
+
+  border { border: none; }
+}
+
+
+/*************
+ * Expanders *
+ *************/
+expander {
+  title > arrow {
+    min-width: 16px;
+    min-height: 16px;
+    -gtk-icon-source: -gtk-icontheme('pan-end-symbolic');
+    &:dir(rtl) { -gtk-icon-source: -gtk-icontheme('pan-end-symbolic-rtl'); }
+
+    &:hover { color: lighten($fg_color,30%); } //only lightens the arrow
+    &:disabled { color: $insensitive_fg_color; }
+    &:disabled:backdrop { color: $backdrop_insensitive_color; }
+
+    &:checked { -gtk-icon-source: -gtk-icontheme('pan-down-symbolic'); }
+  }
+}
+
+
+/************
+ * Calendar *
+ ***********/
+calendar {
+  color: $text_color;
+  border: 1px solid $borders_color;
+
+  &:selected {
+    @extend %selected_items;
+
+    border-radius: 3px;
+  }
+
+  &.header {
+    border-bottom-color: transparentize(black, 0.9);
+
+    &:backdrop { border-bottom-color: transparentize(black, 0.9); }
+  }
+
+  &.button {
+    @extend %undecorated_button;
+
+    color: transparentize($fg_color, 0.55);
+
+    &:hover { color: $fg_color; }
+
+    &:backdrop { color: transparentize($backdrop_fg_color,0.55); }
+
+    &:disabled { color:  transparentize($insensitive_fg_color,0.55); }
+  }
+
+  &.highlight {
+    color: $insensitive_fg_color;
+
+    &:backdrop { color: $backdrop_insensitive_color; }
+  }
+
+  &:backdrop {
+    color: $backdrop_text_color;
+    border-color: $backdrop_borders_color;
+  }
+
+  &:indeterminate { color: gtkalpha(currentColor, 0.1); }
+}
+
+
+/***********
+ * Dialogs *
+ ***********/
+messagedialog { // Message Dialog styling
+  .titlebar {
+    min-height: 20px;
+    background-image: none;
+    background-color: $bg_color;
+    border-style: none;
+    border-top-left-radius: 7px;
+    border-top-right-radius: 7px;
+  }
+
+  &.csd { // rounded bottom border styling for csd version
+    &.background {
+      // bigger radius for better antialiasing
+      border-bottom-left-radius: $window_radius+1;
+      border-bottom-right-radius: $window_radius+1;
+    }
+
+    .dialog-action-area button {
+      padding: 10px 14px; // labels are not vertically centered on message dialog, this is a workaround
+      border-right-style: none;
+      border-bottom-style: none;
+      border-radius: 0;
+      -gtk-outline-radius: 0;
+
+      &:first-child {
+        border-left-style: none;
+        border-bottom-left-radius: $button_radius + 2;
+        -gtk-outline-bottom-left-radius: $button_radius + 2;
+      }
+
+      &:last-child {
+        border-bottom-right-radius: $button_radius + 2;
+        -gtk-outline-bottom-right-radius: $button_radius + 2;
+      }
+    }
+  }
+}
+
+filechooser {
+  .dialog-action-box {
+    border-top: 1px solid $borders_color;
+
+    &:backdrop { border-top-color: $backdrop_borders_color; }
+  }
+
+  #pathbarbox { border-bottom: 1px solid $bg_color; }
+}
+
+filechooserbutton:drop(active) {
+  box-shadow: none;
+  border-color: transparent;
+}
+
+
+/***********
+ * Sidebar *
+ ***********/
+.sidebar {
+  border-style: none;
+  background-color: mix($bg_color, $base_color, 50%);
+
+  &:not(separator) {
+    @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;
+    }
+  }
+
+  &:backdrop {
+    background-color: $backdrop_sidebar_bg_color;
+    border-color: $backdrop_borders_color;
+    transition: $backdrop_transition;
+  }
+
+  list { background-color: transparent; }
+
+  paned & { &.left, &.right, &.left:dir(rtl), &:dir(rtl), &:dir(ltr), & { border-style: none; }}
+}
+
+stacksidebar {
+  &.sidebar {
+    &:dir(ltr),
+    &.left,
+    &.left:dir(rtl) { list { @extend %sidebar_left; }}
+
+    &:dir(rtl),
+    &.right { list { @extend %sidebar_right; }}
+  }
+
+  row {
+    padding: 10px 4px;
+
+    > label {
+      padding-left: 6px;
+      padding-right: 6px;
+    }
+
+    &.needs-attention > label {
+      @extend %needs_attention;
+
+      background-size: 6px 6px, 0 0;
+    }
+  }
+}
+
+separator.sidebar {
+  background-color: $borders_color;
+
+  &:backdrop {
+    background-color: $backdrop_borders_color;
+  }
+
+  &.selection-mode,
+  .selection-mode & {
+    background-color: darken($suggested_bg_color, 20%);
+  }
+}
+
+
+/****************
+ * File chooser *
+ ****************/
+$_placesidebar_icons_opacity: 0.7;
+
+row image.sidebar-icon { opacity: $_placesidebar_icons_opacity; } // dim the sidebar icons
+                                                                  // see bug #786613 for details 
+                                                                  // on this oddity
+
+placessidebar {
+  > viewport.frame { border-style: none; }
+
+  row {
+    // Needs overriding of the GtkListBoxRow padding
+    min-height: 36px;
+    padding: 0px;
+
+    // Using margins/padding directly in the SidebarRow
+    // will make the animation of the new bookmark row jump
+    > revealer { padding: 0 14px; }
+
+    &:selected { color: $selected_fg_color; }
+
+    &:disabled { color: $insensitive_fg_color; }
+
+    &:backdrop {
+      color: $backdrop_fg_color;
+
+      &:selected { color: $backdrop_selected_fg_color; }
+
+      &:disabled { color: $backdrop_insensitive_color; }
+    }
+
+    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 {
+      @extend %button_basic_flat;
+
+      @extend %button_selected_flat;
+
+      min-height: 26px;
+      min-width: 26px;
+      margin-top: 3px;
+      margin-bottom: 3px;
+      padding: 0;
+      border-radius: 100%;
+      -gtk-outline-radius: 100%;
+
+      &:not(:hover):not(:active),
+      &:backdrop { > image { opacity: $_placesidebar_icons_opacity; }}
+    }
+
+    // in the sidebar case it makes no sense to click the selected row
+    &:selected:active { box-shadow: none; }
+
+    &.sidebar-placeholder-row {
+      padding: 0 8px;
+      min-height: 2px;
+      background-image: image($drop_target_color);
+      background-clip: content-box;
+    }
+
+    &.sidebar-new-bookmark-row { color: $selected_bg_color; }
+
+    &:drop(active):not(:disabled) {
+      color: $drop_target_color;
+      box-shadow: inset 0 1px $drop_target_color,
+                  inset 0 -1px $drop_target_color;
+
+      &:selected {
+        color: $selected_fg_color;
+        background-color: $drop_target_color;
+      }
+    }
+  }
+}
+
+placesview {
+  .server-list-button > image {
+    transition: 200ms $ease-out-quad;
+    -gtk-icon-transform: rotate(0turn);
+  }
+
+  .server-list-button:checked > image {
+    transition: 200ms $ease-out-quad;
+    -gtk-icon-transform: rotate(-0.5turn);
+  }
+
+  row.activatable:hover { background-color: transparent; }
+
+  // this selects the "connect to server" label
+  > actionbar > revealer > box > label {
+    padding-left: 8px;
+    padding-right: 8px;
+  }
+}
+
+
+/*********
+ * Paned *
+ *********/
+paned {
+  > separator {
+    min-width: 1px;
+    min-height: 1px;
+    -gtk-icon-source: none; // defeats the ugly default handle decoration
+    border-style: none; // just to be sure
+    background-color: transparent;
+    // workaround, using background istead of a border since the border will get rendered twice (?)
+    background-image: image($borders_color);
+    background-size: 1px 1px;
+
+    &:selected { background-image: image($selected_bg_color); } // FIXME is this needed?
+
+    &:backdrop { background-image: image($backdrop_borders_color); }
+
+    &.wide {
+      min-width: 5px;
+      min-height: 5px;
+      background-color: $bg_color;
+      background-image: image($borders_color), image($borders_color);
+      background-size: 1px 1px, 1px 1px;
+
+      &:backdrop {
+        background-color: $backdrop_bg_color;
+        background-image: image($backdrop_borders_color),
+                          image($backdrop_borders_color);
+      }
+    }
+  }
+
+  &.horizontal > separator {
+    background-repeat: repeat-y;
+
+    &:dir(ltr) {
+      margin: 0 -8px 0 0;
+      padding: 0 8px 0 0;
+      background-position: left;
+    }
+    &:dir(rtl) {
+      margin: 0 0 0 -8px;
+      padding: 0 0 0 8px;
+      background-position: right;
+    }
+
+    &.wide {
+      margin: 0;
+      padding: 0;
+      background-repeat: repeat-y, repeat-y;
+      background-position: left, right;
+    }
+  }
+
+  &.vertical > separator {
+    margin: 0 0 -8px 0;
+    padding: 0 0 8px 0;
+    background-repeat: repeat-x;
+    background-position: top;
+
+    &.wide {
+      margin: 0;
+      padding: 0;
+      background-repeat: repeat-x, repeat-x;
+      background-position: bottom, top;
+    }
+  }
+}
+
+
+/**************
+ * GtkInfoBar *
+ **************/
+infobar {
+  border-style: none;
+
+  &.action:hover > revealer > box {
+      background-color: if($variant == 'light', desaturate(lighten(invert($selected_bg_color), 47%), 30%), 
+                        desaturate(darken(invert($selected_bg_color),42%), 70%));
+      border-bottom: 1px solid lighten($borders_color, 5%);
+  }
+
+  &.info,
+  &.question,
+  &.warning,
+  &.error {
+    &:backdrop > revealer > box, & > revealer > box {
+      label, & { color: $fg_color; }
+      background-color: if($variant == 'light', desaturate(lighten(invert($selected_bg_color), 45%), 30%), 
+                        desaturate(darken(invert($selected_bg_color),40%), 70%));
+      border-bottom: 1px solid lighten($borders_color, 5%);
+    }
+
+    text-shadow: none;
+
+    &:backdrop { text-shadow: none; }
+
+    button {
+      // FIXME: extend selection mode buttons
+      @include button(normal, $bg_color, $fg_color, none);
+
+      &:hover { @include button(hover, $bg_color, $fg_color, none); }
+
+      &:active,
+      &:checked { @include button(active, $bg_color, $fg_color, none); }
+
+      &:disabled { @include button(insensitive,$bg_color,$fg_color,none); }
+
+      &:backdrop {
+        @include button(backdrop, $bg_color, $fg_color, none);
+        border-color: _border_color($bg_color);
+
+        &:disabled {
+          @include button(backdrop-insensitive, $bg_color,
+                          $fg_color, none);
+          border-color: _border_color($bg_color);
+        }
+      }
+      &:backdrop, & {
+        label, & { color: $fg_color; }
+      }
+    }
+
+    selection { background-color: darken($bg_color, 10%); }
+
+    *:link { color: $link_color; }
+  }
+}
+
+
+/************
+ * Tooltips *
+ ************/
+tooltip {
+  &.background {
+    // background-color needs to be set this way otherwise it gets drawn twice
+    // see https://bugzilla.gnome.org/show_bug.cgi?id=736155 for details.
+    background-color: transparentize(black, 0.2);
+    background-clip: padding-box;
+    border: 1px solid $tooltip_borders_color; // this suble border is meant to
+                                              // not make the tooltip melt with
+                                              // very dark backgrounds
+  }
+
+  padding: 4px; /* not working */
+  border-radius: 5px;
+  box-shadow: none; // otherwise it gets inherited by windowframe.csd
+  text-shadow: 0 1px black;
+
+  // FIXME: we need a border or tooltips vanish on black background.
+  decoration { background-color: transparent; }
+
+  * { // Yeah this is ugly
+    padding: 4px;
+    background-color: transparent;
+    color: white;
+  }
+}
+
+
+/*****************
+ * Color Chooser *
+ *****************/
+colorswatch {
+  // This widget is made of two boxes one on top of the other, the lower box is colorswatch {} the other one
+  // is colorswatch overlay {}, colorswatch has the programmatically set background, so most of the style is
+  // applied to the overlay box.
+
+  &:drop(active), & { border-style: none; } // FIXME: implement a proper drop(active) state
+
+  $_colorswatch_radius: 5px;
+
+  // base color corners rounding
+  // to avoid the artifacts caused by rounded corner anti-aliasing the base color
+  // sports a bigger radius.
+  // nth-child is needed by the custom color strip.
+
+  &.top {
+    border-top-left-radius: $_colorswatch_radius + 0.5px;
+    border-top-right-radius: $_colorswatch_radius + 0.5px;
+
+    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 + 0.5px;
+
+    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: $_colorswatch_radius;
+    }
+  }
+
+  &.dark {
+    outline-color: transparentize(white, 0.4);
+
+    overlay {
+      color: white;
+
+      &:hover { border-color: if($variant == 'light', transparentize(black, 0.2), $borders_color); }
+
+      &:backdrop { color: transparentize(white, 0.5); }
+    }
+  }
+
+  &.light {
+    outline-color: transparentize(black, 0.4);
+
+    overlay {
+      color: black;
+
+      &:hover { border-color: if($variant == 'light', transparentize(black, 0.5), $borders_color); }
+
+      &:backdrop { color: transparentize(black, 0.5); }
+    }
+  }
+
+  &:drop(active) {
+    box-shadow: none;
+
+    &.light overlay {
+      border-color: $drop_target_color;
+      box-shadow: inset 0 0 0 2px if($variant == 'light', darken($drop_target_color, 7%), $borders_color),
+                  inset 0 0 0 1px $drop_target_color;
+    }
+
+    &.dark overlay {
+      border-color: $drop_target_color;
+      box-shadow: inset 0 0 0 2px if($variant == 'light', transparentize(black, 0.7), $borders_color),
+                  inset 0 0 0 1px $drop_target_color;
+    }
+  }
+
+  overlay {
+    border: 1px solid if($variant == 'light', transparentize(black, 0.7), $borders_color);
+
+    &:hover {
+      box-shadow: inset 0 1px transparentize(white, 0.6),
+                  inset 0 -1px transparentize(black, 0.8);
+    }
+
+    &:backdrop, &:backdrop:hover {
+      border-color: if($variant == 'light', transparentize(black, 0.7), $borders_color);
+      box-shadow: none;
+    }
+  }
+
+  &#add-color-button {
+    border-radius: $_colorswatch_radius $_colorswatch_radius 0 0;
+
+    &:only-child { border-radius: $_colorswatch_radius; }
+
+    overlay {
+      @include button(normal);
+
+      &:hover { @include button(hover); }
+
+      &:backdrop { @include button(backdrop); }
+    }
+  }
+
+  &:disabled {
+    opacity: 0.5;
+
+    overlay {
+      border-color: transparentize(black, 0.4);
+      box-shadow: none;
+    }
+  }
+
+  row:selected & { box-shadow: 0 0 0 2px $selected_fg_color; }
+
+  &#editor-color-sample {
+    border-radius: 4px;
+
+    overlay { border-radius: 4.5px; }
+  }
+}
+
+// colorscale popup
+colorchooser .popover.osd { border-radius: 5px; }
+
+/********
+ * Misc *
+ ********/
+//content view (grid/list)
+.content-view {
+  background-color: darken($bg_color,7%);
+
+  &:hover { -gtk-icon-effect: highlight; }
+
+  &:backdrop { background-color: darken($bg_color,7%); }
+
+  rubberband, .rubberband { @extend rubberband; }
+}
+
+.scale-popup {
+  .osd & { @extend %osd; }
+
+  .osd & button.flat {  //FIXME: quick hack, redo properly
+    border-style: none;
+    border-radius: 5px;
+  }
+
+  button { // +/- buttons on GtkVolumeButton popup
+    &:hover {
+      @extend %undecorated_button;
+      background-color: transparentize($fg_color,0.9);
+      border-radius: 5px;
+    }
+
+    &:backdrop { &:hover, &:disabled, & { @extend %undecorated_button; }}
+  }
+}
+
+
+/**********************
+ * Window Decorations *
+ *********************/
+decoration {
+  border-radius: $window_radius $window_radius 0 0;
+  // lamefun trick to get rounded borders regardless of CSD use
+  border-width: 0px;
+
+  // this needs to be transparent
+  // see bug #722563
+  $_wm_border: if($variant=='light', transparentize(black, 0.77), transparentize(black, 0.25));
+  $_wm_border_backdrop: if($variant=='light', transparentize(black, 0.82), transparentize(black, 0.25));
+
+  box-shadow: 0 3px 9px 1px transparentize(black, 0.5),
+              0 0 0 1px $_wm_border; //doing borders with box-shadow
+
+  // FIXME rationalize shadows
+
+  // 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.
+    // The biggest shadow should be in the same order then in the active state
+    // or the jumping will happen during the transition.
+    box-shadow: 0 3px 9px 1px transparent,
+                0 2px 6px 2px transparentize(black, 0.8),
+                0 0 0 1px $_wm_border_backdrop;
+    transition: $backdrop_transition;
+  }
+
+  .maximized &,
+  .fullscreen & { border-radius: 0; box-shadow: none; }
+
+  .tiled &,
+  .tiled-top &,
+  .tiled-right &,
+  .tiled-bottom &,
+  .tiled-left & {
+    border-radius: 0;
+    box-shadow: 0 0 0 1px $_wm_border_backdrop,
+                0 0 0 20px transparent; //transparent control workaround -- #3670
+
+    &:backdrop { box-shadow: 0 0 0 1px $_wm_border_backdrop,
+                             0 0 0 20px transparent; // #3670
+    }
+   }
+
+  .popup & { box-shadow: none; }
+
+  // server-side decorations as used by mutter
+  // just doing borders, wm draws actual shadows
+  .ssd & { box-shadow: 0 0 0 1px $_wm_border; }
+  .ssd &:backdrop { box-shadow: 0 0 0 1px $_wm_border_backdrop; }
+
+  .csd.popup & {
+    border-radius: $menu_radius;
+    box-shadow: 0 1px 2px transparentize(black, 0.8),
+                0 0 0 1px transparentize($_wm_border, 0.1);
+  }
+
+  tooltip.csd & {
+    border-radius: 5px;
+    box-shadow: none;
+  }
+
+  messagedialog.csd & {
+    border-radius: $window_radius;
+    box-shadow: 0 1px 2px transparentize(black, 0.8),
+                0 0 0 1px transparentize($_wm_border, 0.1);
+  }
+
+  .solid-csd & {
+    margin: 0;
+    padding: 4px;
+    background-color: $borders_color;
+    border: solid 1px $borders_color;
+    border-radius: 0;
+    box-shadow: inset 0 0 0 3px $headerbar_color, inset 0 1px $top_hilight;
+
+    &:backdrop { box-shadow: inset 0 0 0 3px $backdrop_bg_color, inset 0 1px $top_hilight; }
+  }
+}
+
+// Window Close button
+button.titlebutton {
+  @extend %button_basic;
+
+  @extend %button_basic_flat;
+
+  @include _button_text_shadow;
+
+  &:not(.appmenu) {
+    border-radius: 9999px;
+    padding: $_hb_btn_pad;
+    margin: 0 2px;
+    min-width: 0;
+    min-height: 0;
+  }
+
+  .selection-mode & {
+    @extend %selection_mode_button_flat;
+
+    @extend %nobg_selected_items;
+  }
+
+  &:backdrop { -gtk-icon-shadow: none; }
+}
+
+.selection-mode headerbar button.titlebutton,
+.selection-mode .titlebar button.titlebutton,
+headerbar.selection-mode button.titlebutton,
+.titlebar.selection-mode button.titlebutton {
+  @include _button_text_shadow(white, $suggested_bg_color);
+
+  &:backdrop { -gtk-icon-shadow: none; }
+}
+
+// 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%); }
+
+    @at-root %selected_items_backdrop,
+    &:backdrop {
+      color: $backdrop_selected_fg_color;
+
+      &:disabled { color: mix($backdrop_selected_fg_color, $selected_bg_color, 30%); }
+    }
+  }
+}
+
+.monospace { font-family: monospace; }
+
+
+/**********************
+ * Touch Copy & Paste *
+ *********************/
+//touch selection handlebars for the Popover.osd above
+cursor-handle {
+  background-color: transparent;
+  background-image: none;
+  box-shadow: none;
+  border-style: none;
+
+  @each $s,$as in ('',''),
+                  (':hover','-hover'),
+                  (':active','-active') { //no need for insensitive and backdrop
+    &.top#{$s}:dir(ltr), &.bottom#{$s}:dir(rtl) {
+      $_url: 'assets/text-select-start#{$as}#{$asset_suffix}';
+      -gtk-icon-source: -gtk-scaled(url('#{$_url}.png'),
+                                    url('#{$_url}@2.png'));
+      padding-left: 10px;
+    }
+
+    &.bottom#{$s}:dir(ltr), &.top#{$s}:dir(rtl) {
+      $_url: 'assets/text-select-end#{$as}#{$asset_suffix}';
+      -gtk-icon-source: -gtk-scaled(url('#{$_url}.png'),
+                                    url('#{$_url}@2.png'));
+      padding-right: 10px;
+    }
+
+    &.insertion-cursor#{$s}:dir(ltr), &.insertion-cursor#{$s}:dir(rtl) {
+      $_url: 'assets/slider-horz-scale-has-marks-above#{$as}#{$asset_suffix}';
+      -gtk-icon-source: -gtk-scaled(url('#{$_url}.png'),
+                                    url('#{$_url}@2.png'));
+    }
+  }
+}
+
+.context-menu { font: initial; } // Decouple the font of context menus from their entry/textview
+
+// shortcut window keys
+.keycap {
+  min-width: 20px;
+  min-height: 25px;
+  margin-top: 2px;
+  padding-bottom: 3px;
+  padding-left: 6px;
+  padding-right: 6px;
+
+  color: $fg_color;
+  background-color: $base_color;
+  border: 1px solid;
+  border-color: if($variant == 'light', mix($borders_color, $bg_color, 50%), $borders_color);
+  border-radius: 5px;
+  box-shadow: if($variant == 'light', inset 0 -3px mix($base_color, $bg_color, 20%), inset 0 -3px mix($borders_color, $base_color, 60%));
+  font-size: smaller;
+
+  &:backdrop {
+    background-color: $backdrop_base_color;
+    color: $backdrop_fg_color;
+    transition: $backdrop_transition;
+  }
+}
+
+:not(decoration):not(window):drop(active):focus,
+:not(decoration):not(window):drop(active) { // FIXME needs to be done widget by widget, this wildcard should really die
+  border-color: $drop_target_color;
+  box-shadow: inset 0 0 0 1px $drop_target_color;
+  caret-color: $drop_target_color;
+}
+
+stackswitcher button.text-button { min-width: 100px; } // FIXME aggregate with buttons
+
+stackswitcher button.circular,
+stackswitcher button.text-button.circular { // FIXME aggregate with buttons
+  min-width: 32px;
+  min-height: 32px;
+  padding: 0;
+}
+
+/*************
+ * App Icons *
+ *************/
+/* Outline for low res icons */
+.lowres-icon {
+    -gtk-icon-shadow: 0 -1px rgba(0,0,0,0.05),
+      1px 0 rgba(0,0,0,0.1),
+      0 1px rgba(0,0,0,0.3),
+      -1px 0 rgba(0,0,0,0.1);
+}
+
+/* Dropshadow for large icons */
+.icon-dropshadow {
+  -gtk-icon-shadow: 0 1px 12px rgba(0,0,0,0.05),
+      0 -1px rgba(0,0,0,0.05),
+      1px 0 rgba(0,0,0,0.1),
+      0 1px rgba(0,0,0,0.3),
+      -1px 0 rgba(0,0,0,0.1);
+}
+
+/*********
+ * Emoji *
+ ********/
+
+popover.emoji-picker { 
+  padding-left: 0;
+  padding-right: 0;
+
+  entry.search { margin: 3px 5px 5px 5px; }
+}
+
+button.emoji-section {
+  border-color: transparent;
+  border-width: 3px;
+  border-style: none none solid;
+  border-radius: 0;
+
+  margin: 2px 4px 2px 4px;
+  padding: 3px 0 0;
+  min-width: 32px;
+  min-height: 28px;
+
+  /* reset props inherited from the button style */
+  background: none;
+  box-shadow: none;
+  text-shadow: none;
+
+  outline-offset: -5px;
+
+  &:first-child { margin-left: 7px; }
+  &:last-child { margin-right: 7px; }
+
+  &:backdrop:not(:checked) { border-color: transparent; }
+  &:hover { border-color: if($variant == 'light', $borders_color, transparentize($fg_color, .9)); }
+  &:checked { border-color: $selected_bg_color; }
+
+  label {
+    padding: 0;
+
+    opacity: 0.55;
+  }
+
+  &:hover label { opacity: 0.775; }
+  &:checked label { opacity: 1; }
+}
+
+popover.emoji-picker .emoji {
+  font-size: x-large;
+  padding: 6px;
+
+  :hover {
+    background: $selected_bg_color;
+    border-radius: 6px;
+  }
+}
+
+popover.emoji-completion arrow {
+  border: none;
+  background: none;
+}
+
+popover.emoji-completion contents row box {
+  padding: 2px 10px;
+}
+
+popover.emoji-completion .emoji:hover {
+  background: $popover_hover_color;
+}