initial commit

_colors.scss

@@ -0,0 +1,70 @@
+// When color definition differs for dark and light variant
+// it gets @if ed depending on $variant
+
+
+$base_color: if($variant == 'light', #ffffff, lighten(desaturate(#241f31, 20%), 2%));
+$text_color: if($variant == 'light', black, white);
+$bg_color: if($variant == 'light', #f6f5f4, desaturate(#3d3846, 10%));
+$fg_color: if($variant == 'light', #2e3436, #eeeeec);
+
+$selected_fg_color: #ffffff;
+$selected_bg_color: if($variant == 'light', #3584e4, darken(#3584e4, 20%));
+$selected_borders_color: if($variant== 'light', darken($selected_bg_color, 15%), darken($selected_bg_color, 30%));
+$borders_color: if($variant == 'light', darken($bg_color, 18%), darken($bg_color, 10%));
+$alt_borders_color: if($variant == 'light', darken($bg_color, 24%), darken($bg_color, 18%));
+$borders_edge: if($variant == 'light', transparentize(white, 0.2), transparentize($fg_color, 0.93));
+$link_color: if($variant == 'light', darken($selected_bg_color, 10%), lighten($selected_bg_color, 20%));
+$link_visited_color: if($variant == 'light', darken($selected_bg_color, 20%), lighten($selected_bg_color, 10%));
+$top_hilight: $borders_edge;
+$dark_fill: mix($borders_color, $bg_color, 50%);
+$headerbar_color: if($variant == 'light', lighten($bg_color, 5%), darken($bg_color, 3%));
+$menu_color: if($variant == 'light', $base_color, mix($bg_color, $base_color, 20%));
+$popover_bg_color: $bg_color;
+$popover_hover_color: lighten($bg_color, 5%);
+
+$scrollbar_bg_color: if($variant == 'light', mix($bg_color, $fg_color, 80%), mix($base_color, $bg_color, 50%));
+$scrollbar_slider_color: mix($fg_color, $bg_color, 60%);
+$scrollbar_slider_hover_color: mix($fg_color, $bg_color, 80%);
+$scrollbar_slider_active_color: if($variant=='light', darken($selected_bg_color, 10%), lighten($selected_bg_color, 10%));
+
+$warning_color: #f57900;
+$error_color: #cc0000;
+$success_color: if($variant == 'light', #33d17a, darken(#33d17a, 10%));
+$destructive_color: if($variant == 'light', #e01b24, darken(#e01b24, 10%));
+
+$osd_fg_color: #eeeeec;
+$osd_text_color: white;
+$osd_bg_color: transparentize(darken(#3d3846,10%), 0.3);
+$osd_insensitive_bg_color: transparentize(mix($osd_fg_color, opacify($osd_bg_color, 1), 10%), 0.5);
+$osd_insensitive_fg_color: mix($osd_fg_color, opacify($osd_bg_color, 1), 50%);
+$osd_borders_color: transparentize(black, 0.3);
+
+$sidebar_bg_color: mix($bg_color, $base_color, 50%);
+$base_hover_color: transparentize($fg_color, 0.95);
+
+$tooltip_borders_color: transparentize(white, 0.9);
+$shadow_color: transparentize(black, 0.9);
+
+$drop_target_color: #4e9a06;
+
+//insensitive state derived colors
+$insensitive_fg_color: mix($fg_color, $bg_color, 50%);
+$insensitive_bg_color: mix($bg_color, $base_color, 60%);
+$insensitive_borders_color: $borders_color;
+
+//colors for the backdrop state, derived from the main colors.
+$backdrop_base_color: if($variant == 'light', darken($base_color, 1%), lighten($base_color, 1%));
+$backdrop_text_color: mix($text_color, $backdrop_base_color, 80%);
+$backdrop_bg_color: $bg_color;
+$backdrop_fg_color: mix($fg_color, $backdrop_bg_color, 50%);
+$backdrop_insensitive_color: if($variant == 'light', darken($backdrop_bg_color, 15%), lighten($backdrop_bg_color, 15%));
+$backdrop_selected_fg_color: if($variant == 'light', $backdrop_base_color, $backdrop_text_color);
+$backdrop_borders_color: mix($borders_color, $bg_color, 80%);
+$backdrop_dark_fill: mix($backdrop_borders_color, $backdrop_bg_color, 35%);
+$backdrop_sidebar_bg_color: mix($backdrop_bg_color, $backdrop_base_color, 50%);
+
+$backdrop_scrollbar_bg_color: darken($backdrop_bg_color, 3%);
+$backdrop_scrollbar_slider_color: mix($backdrop_fg_color, $backdrop_bg_color, 40%);
+
+$backdrop_menu_color: if($variant == 'light', $backdrop_base_color, mix($backdrop_bg_color, $backdrop_base_color, 20%));
+

_drawing.scss

@@ -0,0 +1,583 @@
+// Drawing mixins
+
+// generic drawing of more complex things
+
+@function _widget_edge($c:$borders_edge) {
+// outer highlight "used" on most widgets
+  @if $c == none { @return none; }
+  @else { @return 0 1px $c; }
+}
+
+@mixin _shadows($list...) {
+//
+// Helper mixin to stack up to box-shadows;
+//
+  $shadows: null;
+
+  @each $shadow in $list {
+    @if $shadow!=none { $shadows: $shadows, $shadow; }
+  }
+
+  box-shadow: $shadows;
+}
+
+// entries
+@function entry_focus_border($fc:$selected_bg_color) {
+  @if $variant == 'light' { @return $fc; }
+  @else { @return if($fc==$selected_bg_color, $selected_borders_color, darken($fc, 35%)); }
+}
+
+@function entry_focus_shadow($fc:$selected_bg_color) { @return inset 0 0 0 1px $fc; }
+
+@mixin entry($t, $fc:$selected_bg_color, $edge: none) {
+//
+// Entries drawing function
+//
+// $t: entry type
+// $fc: focus color
+// $edge: set to none to not draw the bottom edge or specify a color to not
+//        use the default one
+//
+// possible $t values:
+// normal, focus, insensitive, backdrop, backdrop-insensitive, osd, osd-focus, osd-backdrop;
+//
+
+  $_blank_edge: if($edge == none, none, 0 1px transparentize($edge, 1));
+  $_entry_edge: if($edge == none, none, _widget_edge($edge));
+
+  @if $t==normal {
+    color: $text_color;
+    border-color: $borders_color;
+    background-color: $base_color;
+    @include _shadows(entry_focus_shadow(transparentize($fc, 1)), $_entry_edge);
+    // for the transition to work the number of shadows in different states needs to match, hence the transparent shadow here.
+  }
+  @if $t==focus {
+    @include _shadows(entry_focus_shadow($fc), $_entry_edge);
+    border-color: entry_focus_border($fc);
+  }
+  @if $t==insensitive {
+    color: $insensitive_fg_color;
+    border-color: $borders_color;
+    background-color: $insensitive_bg_color;
+    box-shadow: $_entry_edge;
+  }
+  @if $t==backdrop {
+    color: $backdrop_text_color;
+    border-color: $backdrop_borders_color;
+    background-color: $backdrop_base_color;
+    box-shadow: $_blank_edge;
+  }
+  @if $t==backdrop-insensitive {
+    color: $backdrop_insensitive_color;
+    border-color: $backdrop_borders_color;
+    background-color: $insensitive_bg_color;
+    box-shadow: $_blank_edge;
+  }
+  @if $t==osd {
+    color: $osd_text_color;
+    border-color: $osd_borders_color;
+    background-color: transparentize(opacify($osd_borders_color, 1), 0.5);
+    background-clip: padding-box;
+    box-shadow: none;
+    text-shadow: 0 1px black;
+    -gtk-icon-shadow: 0 1px black;
+  }
+  @if $t==osd-focus {
+    color: $osd_text_color;
+    border-color: $selected_bg_color;
+    background-color: transparentize(opacify($osd_borders_color, 1), 0.5);
+    background-clip: padding-box;
+    box-shadow: entry_focus_shadow($fc);
+    text-shadow: 0 1px black;
+    -gtk-icon-shadow: 0 1px black;
+  }
+  @if $t==osd-insensitive {
+    color: $osd_insensitive_fg_color;
+    border-color: $osd_borders_color;
+    background-color: $osd_insensitive_bg_color;
+    background-clip: padding-box;
+    box-shadow: none;
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+  }
+  @if $t==osd-backdrop {
+    color: $osd_text_color;
+    border-color: $osd_borders_color;
+    background-color: transparentize(opacify($osd_borders_color, 1), 0.5);
+    background-clip: padding-box;
+    box-shadow: none;
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+  }
+}
+
+// buttons
+
+@function _border_color($c, $darker: false) {
+  @if $darker == true { @return darken($c, 20%); }
+  @else { @return darken($c, 10%); }
+}
+
+@function _text_shadow_color ($tc: $fg_color, $bg: $bg_color) {
+//
+// calculate the color of text shadows
+//
+// $tc is the text color
+// $bg is the background color
+//
+  $_lbg: lightness($bg)/100%;
+  @if lightness($tc)<50% { @return transparentize(white, 1-$_lbg/($_lbg*1.3)); }
+  @else { @return transparentize(black, $_lbg*0.8); }
+}
+
+@function _button_hilight_color($c) {
+//
+// calculate the right top hilight color for buttons
+//
+// $c: base color;
+//
+  @if lightness($c)>95% { @return white; }
+  @else if lightness($c)>90% { @return transparentize(white, 0.2); }
+  @else if lightness($c)>80% { @return transparentize(white, 0.5); }
+  @else if lightness($c)>50% { @return transparentize(white, 0.8); }
+  @else if lightness($c)>40% { @return transparentize(white, 0.9); }
+  @else { @return transparentize(white, 0.98); }
+}
+
+@mixin _button_text_shadow ($tc:$fg_color, $bg:$bg_color) {
+//
+// helper function for the text emboss effect
+//
+// $tc is the optional text color, not the shadow color
+//
+// TODO: this functions needs a way to deal with special cases
+//
+
+  $_shadow: _text_shadow_color($tc, $bg);
+
+  @if lightness($tc)<50% {
+    text-shadow: 0 1px $_shadow;
+    -gtk-icon-shadow: 0 1px $_shadow;
+  }
+  @else {
+    text-shadow: 0 -1px $_shadow;
+    -gtk-icon-shadow: 0 -1px $_shadow;
+  }
+}
+
+@mixin button($t, $c:$bg_color, $tc:$fg_color, $edge: none) {
+//
+// Button drawing function
+//
+// $t:    button type,
+// $c:    base button color for colored* types
+// $tc:   optional text color for colored* types
+// $edge: set to none to not draw the bottom edge or specify a color to not
+//        use the default one
+//
+// possible $t values:
+// normal, hover, active, insensitive, insensitive-active,
+// backdrop, backdrop-active, backdrop-insensitive, backdrop-insensitive-active,
+// osd, osd-hover, osd-active, osd-insensitive, osd-backdrop, undecorated
+//
+// This mixin sets the $button_fill global variable which containts the button background-image
+//
+  $_hilight_color: _button_hilight_color($c);
+  $_button_edge: if($edge == none, none, _widget_edge($edge));
+  $_blank_edge: if($edge == none, none, _widget_edge(transparentize($edge,1)));
+  $_button_shadow: 0 1px 2px transparentize($shadow_color, 0.03);
+
+  @if $t==normal {
+  //
+  // normal button
+  //
+    color: $tc;
+    outline-color: transparentize($tc, 0.7);
+    border-color: if($c != $bg_color, _border_color($c), $borders_color);
+    border-bottom-color: if($c != $bg_color, _border_color($c, true), $alt_borders_color);
+    $button_fill: if($variant == 'light', linear-gradient(to top, darken($c, 4%) 2px, $c),
+                                          linear-gradient(to top, darken($c,1%) 2px, $c)) !global;
+    background-image: $button_fill;
+    @include _button_text_shadow($tc, $c);
+    @include _shadows(inset 0 1px $_hilight_color, $_button_edge, $_button_shadow);
+  }
+
+  @else if $t==hover {
+  //
+  // hovered button
+  //
+    color: $tc;
+    outline-color: transparentize($tc, 0.7);
+    border-color: if($c != $bg_color, _border_color($c), $borders_color);
+    border-bottom-color: if($c != $bg_color, _border_color($c, true), $alt_borders_color);
+    @if $variant == 'light' {
+      $button_fill: linear-gradient(to top, $c, lighten($c, 1%) 1px) !global;
+      @include _button_text_shadow($tc, lighten($c, 6%));
+      @include _shadows(inset 0 1px _button_hilight_color(lighten($c, 6%)), $_button_edge, $_button_shadow);
+    }
+    @else {
+      $button_fill: linear-gradient(to top, darken($c,1%), lighten($c, 1%) 1px) !global;
+      @include _button_text_shadow($tc,lighten($c, 6%));
+      @include _shadows(inset 0 1px _button_hilight_color(darken($c, 2%)), $_button_edge, $_button_shadow);
+    }
+    background-image: $button_fill;
+  }
+
+  @if $t==normal-alt {
+  //
+  // normal button alternative look
+  //
+    color: $tc;
+    outline-color: transparentize($tc, 0.7);
+    border-color: if($c != $bg_color, _border_color($c, true), $alt_borders_color);
+    @include _button_text_shadow($tc, $c);
+    @if $variant == 'light' {
+      background-image: linear-gradient(to bottom, lighten($c, 5%) 20%, $c 90%);
+       @include _shadows(inset 0 1px _button_hilight_color(lighten($c, 6%)),
+                        $_button_edge, $_button_shadow);
+    }
+    @else {
+      background-image: linear-gradient(to bottom, darken($c, 3%) 20%, darken($c, 6%) 90%);
+      @include _shadows(inset 0 1px $_hilight_color,
+                        $_button_edge, $_button_shadow);
+    }
+  }
+
+  @else if $t==hover-alt {
+  //
+  // hovered button alternative look
+  //
+    color: $tc;
+    outline-color: transparentize($tc, 0.7);
+    border-color: if($c != $bg_color, _border_color($c, true), $alt_borders_color);
+    @if $variant == 'light' {
+      $button_fill: linear-gradient(to bottom, lighten($c, 9%) 10%, lighten($c, 4%) 90%) !global;
+      @include _shadows(inset 0 1px _button_hilight_color(lighten($c, 6%)),
+                        $_button_edge, $_button_shadow);
+    }
+    @else {
+      $button_fill: linear-gradient(to bottom, $c 20%, darken($c, 4%) 90%) !global;
+      @include _shadows(inset 0 1px $_hilight_color,
+                        $_button_edge, $_button_shadow);
+    }
+    background-image: $button_fill;
+  }
+
+  @else if $t==active {
+  //
+  // pushed button
+  //
+    color: $tc;
+    outline-color: transparentize($tc, 0.7);
+    border-color: if($c != $bg_color, _border_color($c), $borders_color);
+    $button_fill: if($variant == 'light', image(darken($c, 14%)), image(darken($c, 9%))) !global;
+    background-image: $button_fill;
+    @include _shadows(inset 0 1px transparentize($_hilight_color, 1), $_button_edge);
+
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+  }
+
+  @else if $t==insensitive {
+  //
+  // insensitive button
+  //
+    $_bg: if($c != $bg_color, mix($c, $base_color, 85%), $insensitive_bg_color);
+
+    label, & { color: if($tc != $fg_color, mix($tc, $_bg, 50%), $insensitive_fg_color); }
+
+    border-color: if($c != $bg_color, _border_color($c), $insensitive_borders_color);
+    $button_fill: image($_bg) !global;
+    background-image: $button_fill;
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+    // white with 0 alpha to avoid an ugly transition, since no color means
+    // black with 0 alpha
+    @include _shadows(inset 0 1px transparentize(white, 1), $_button_edge);
+  }
+
+  @else if $t==insensitive-active {
+  //
+  // insensitive pushed button
+  //
+    $_bg: if($variant == 'light', darken(mix($c, $base_color, 85%), 8%), darken(mix($c, $base_color, 85%), 6%));
+    $_bc: if($c != $bg_color, _border_color($c), $insensitive_borders_color);
+
+    label, & { color: if($c != $bg_color, mix($tc, $_bg, 60%), $insensitive_fg_color); }
+
+    border-color: $_bc;
+    $button_fill: image($_bg) !global;
+    background-image: $button_fill;
+    // white with 0 alpha to avoid an ugly transition, since no color means
+    // black with 0 alpha
+    @include _shadows(inset 0 1px transparentize(white, 1), $_button_edge);
+  }
+
+  @else if $t==backdrop {
+  //
+  // backdrop button
+  //
+    $_bg: if($c != $bg_color, $c, $backdrop_bg_color);
+    $_bc: if($variant == 'light', $c, _border_color($c));
+
+    label, & { color: if($tc != $fg_color, mix($tc, $_bg, 80%), $backdrop_fg_color); }
+
+    border-color: if($c != $bg_color, $_bc, $backdrop_borders_color);
+    $button_fill: image($_bg) !global;
+    background-image: $button_fill;
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+    @include _shadows(inset 0 1px transparentize(white, 1), $_blank_edge);
+  }
+
+  @else if $t==backdrop-active {
+  //
+  // backdrop pushed button
+  //
+    $_bg: if($variant == 'light', darken(mix($c, $base_color, 85%), 8%), darken(mix($c, $base_color, 85%), 4%));
+    $_bc: if($variant == 'light', $_bg ,_border_color($c));
+
+    label, & { color: if($tc != $fg_color, mix($tc, $_bg, 80%), $backdrop_fg_color); }
+
+    border-color: if($c != $bg_color, $_bc, $backdrop_borders_color);
+    $button_fill: image($_bg) !global;
+    background-image: $button_fill;
+    @include _shadows(inset 0 1px transparentize(white, 1), $_blank_edge);
+  }
+
+  @else if $t==backdrop-insensitive {
+  //
+  // backdrop insensitive button
+  //
+
+    $_bg: if($c != $bg_color, mix($c, $base_color, 85%), $insensitive_bg_color);
+    $_bc: if($variant == 'light', $_bg,_border_color($c));
+
+    label, & { color: if($c != $bg_color, mix($tc, $_bg, 35%), $backdrop_insensitive_color); }
+
+    border-color: if($c != $bg_color, $_bc, $backdrop_borders_color);
+    $button_fill: image($_bg) !global;
+    background-image: $button_fill;
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+    // white with 0 alpha to avoid an ugly transition, since no color means
+    // black with 0 alpha
+    @include _shadows(inset 0 1px transparentize(white, 1), $_blank_edge);
+  }
+
+  @else if $t==backdrop-insensitive-active {
+  //
+  // backdrop insensitive pushed button
+  //
+
+    $_bg: if($variant == 'light', darken(mix($c, $base_color, 85%), 8%), darken(mix($c, $base_color, 85%), 4%));
+    $_bc: if($variant == 'light', $_bg, _border_color($c));
+
+    label { color: if($c != $bg_color, mix($tc, $_bg, 35%), $backdrop_insensitive_color); }
+
+    border-color: if($c != $bg_color, $_bc, $backdrop_borders_color);
+    $button_fill: image($_bg) !global;
+    background-image: $button_fill;
+    @include _shadows(inset 0 1px transparentize(white, 1), $_blank_edge);
+  }
+
+  @else if $t==osd {
+  //
+  // normal osd button
+  //
+    $_bg: if($c != $bg_color, transparentize($c, 0.5), $osd_bg_color);
+
+    color: $osd_fg_color;
+    border-color: $osd_borders_color;
+    background-color: transparent;
+    $button_fill: image($_bg) !global;
+    background-image: $button_fill;
+    background-clip: padding-box;
+    box-shadow: inset 0 1px transparentize(white, 0.9);
+    text-shadow: 0 1px black;
+    -gtk-icon-shadow: 0 1px black;
+    outline-color: transparentize($osd_fg_color, 0.7);
+  }
+
+  @else if $t==osd-hover {
+  //
+  // active osd button
+  //
+    $_bg: if($c != $bg_color, transparentize($c, 0.3), lighten($osd_bg_color, 12%));
+
+    color: white;
+    border-color: $osd_borders_color;
+    background-color: transparent;
+    $button_fill: image($_bg) !global;
+    background-image: $button_fill;
+    background-clip: padding-box;
+    box-shadow: inset 0 1px transparentize(white, 0.9);
+    text-shadow: 0 1px black;
+    -gtk-icon-shadow: 0 1px black;
+    outline-color: transparentize($osd_fg_color, 0.7);
+  }
+
+  @else if $t==osd-active {
+  //
+  // active osd button
+  //
+    $_bg: if($c != $bg_color, $c, $osd_borders_color);
+
+    color: white;
+    border-color: $osd_borders_color;
+    background-color: transparent;
+    $button_fill: image($_bg) !global;
+    background-image: $button_fill;
+    background-clip: padding-box;
+    box-shadow: none;
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+    outline-color: transparentize($osd_fg_color, 0.7);
+  }
+
+  @else if $t==osd-insensitive {
+  //
+  // insensitive osd button
+  //
+    color: $osd_insensitive_fg_color;
+    border-color: $osd_borders_color;
+    background-color: transparent;
+    $button_fill: image($osd_insensitive_bg_color) !global;
+    background-image: $button_fill;
+    background-clip: padding-box;
+    box-shadow: none;
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+  }
+
+  @else if $t==osd-backdrop {
+  //
+  // backdrop osd button
+  //
+    $_bg: if($c != $bg_color, transparentize($c, 0.5), $osd_bg_color);
+
+    color: $osd_fg_color;
+    border-color: $osd_borders_color;
+    background-color: transparent;
+    $button_fill: image($_bg) !global;
+    background-image: $button_fill;
+    background-clip: padding-box;
+    box-shadow: none;
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+  }
+
+  @else if $t==undecorated {
+  //
+  // reset
+  //
+    border-color: transparent;
+    background-color: transparent;
+    $button_fill: none !global;
+    background-image: $button_fill;
+
+    @include _shadows(inset 0 1px transparentize(white, 1), $_blank_edge);
+
+    text-shadow: none;
+    -gtk-icon-shadow: none;
+  }
+}
+
+@mixin headerbar_fill($c:$headerbar_color, $hc:$top_hilight, $ov: none) {
+//
+// headerbar fill
+//
+// $c:  base color
+// $hc: top highlight color
+// $ov: a background layer for background shorthand (hence no commas!)
+//
+  $gradient: linear-gradient(to top, darken($c, 2%), lighten($c, 1%));
+
+  @if $variant == 'dark' { $gradient: linear-gradient(to top, lighten($c, 4%), lighten($c, 6%)); }
+
+  @if $ov != none { background: $c $ov, $gradient; }
+  @else { background: $c $gradient; }
+
+  box-shadow: inset 0 1px $hc; // top highlight
+}
+
+@mixin overshoot($p, $t:normal, $c:$fg_color) {
+//
+// overshoot
+//
+// $p: position
+// $t: type
+// $c: base color
+//
+// possible $p values:
+// top, bottom, right, left
+//
+// possible $t values:
+// normal, backdrop
+//
+
+  $_small_gradient_length: 5%;
+  $_big_gradient_length: 100%;
+
+  $_position: center top;
+  $_small_gradient_size: 100% $_small_gradient_length;
+  $_big_gradient_size: 100% $_big_gradient_length;
+
+  @if $p==bottom {
+    $_position: center bottom;
+    $_linear_gradient_direction: to top;
+  }
+
+  @else if $p==right {
+    $_position: right center;
+    $_small_gradient_size: $_small_gradient_length 100%;
+    $_big_gradient_size: $_big_gradient_length 100%;
+  }
+
+  @else if $p==left {
+    $_position: left center;
+    $_small_gradient_size: $_small_gradient_length 100%;
+    $_big_gradient_size: $_big_gradient_length 100%;
+  }
+
+  $_small_gradient_color: $c;
+  $_big_gradient_color: $c;
+
+  @if $c==$fg_color {
+    $_small_gradient_color: darken($borders_color, 10%);
+    $_big_gradient_color: $fg_color;
+
+    @if $t==backdrop { $_small_gradient_color: $backdrop_borders_color; }
+  }
+
+  $_small_gradient: -gtk-gradient(radial,
+                                  $_position, 0,
+                                  $_position, 0.5,
+                                  to($_small_gradient_color),
+                                  to(transparentize($_small_gradient_color, 1)));
+
+  $_big_gradient: -gtk-gradient(radial,
+                                $_position, 0,
+                                $_position, 0.6,
+                                from(transparentize($_big_gradient_color, 0.93)),
+                                to(transparentize($_big_gradient_color, 1)));
+
+  @if $t==normal {
+    background-image: $_small_gradient, $_big_gradient;
+    background-size: $_small_gradient_size, $_big_gradient_size;
+  }
+
+  @else if $t==backdrop {
+    background-image: $_small_gradient;
+    background-size: $_small_gradient_size;
+  }
+
+  background-repeat: no-repeat;
+  background-position: $_position;
+
+  background-color: transparent; // reset some properties to be sure to not inherit them somehow
+  border: none;                  //
+  box-shadow: none;              //
+}
+

_palette.scss

@@ -0,0 +1,8 @@
+$palette_blue:    rgb(26,   95, 180);
+$palette_red:     rgb(192,  28,  40);
+$palette_yellow:  rgb(229, 165,  10);
+$palette_orange:  rgb(198,  70,   0);
+$palette_purple:  rgb( 97,  53, 131);
+$palette_brown:   rgb( 99,  69,  44);
+$palette_green:   rgb( 38, 162, 105);
+$palette_dark:    rgb( 61,  56,	 70);

headerbar-color.css

@@ -0,0 +1,41 @@
+headerbar {
+  background: #2b9d69 linear-gradient(to top, #299563, #2ca16b);
+  box-shadow: inset 0 1px #36c583;
+  color: white; }
+  headerbar button {
+    color: white;
+    outline-color: rgba(255, 255, 255, 0.3);
+    border-color: #26895b;
+    border-bottom-color: #1b6141;
+    background-image: linear-gradient(to top, #2ca16b 2px, #30b176);
+    text-shadow: 0 -1px rgba(0, 0, 0, 0.646275);
+    -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.646275);
+    box-shadow: inset 0 1px rgba(255, 255, 255, 0.1), 0 1px 2px rgba(0, 0, 0, 0.07); }
+    headerbar button.flat, headerbar button.titlebutton {
+      border-color: transparent;
+      background-color: transparent;
+      background-image: none;
+      box-shadow: inset 0 1px rgba(255, 255, 255, 0);
+      text-shadow: none;
+      -gtk-icon-shadow: none; }
+    headerbar button:hover {
+      color: white;
+      outline-color: rgba(255, 255, 255, 0.3);
+      border-color: #26895b;
+      border-bottom-color: #1b6141;
+      text-shadow: 0 -1px rgba(0, 0, 0, 0.598275);
+      -gtk-icon-shadow: 0 -1px rgba(0, 0, 0, 0.598275);
+      box-shadow: inset 0 1px rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.07);
+      background-image: linear-gradient(to top, #30b176, #32b579 1px); }
+    headerbar button:active, headerbar button:checked {
+      color: white;
+      outline-color: rgba(255, 255, 255, 0.3);
+      border-color: #26895b;
+      background-image: image(#217951);
+      box-shadow: inset 0 1px rgba(255, 255, 255, 0);
+      text-shadow: none;
+      -gtk-icon-shadow: none; }
+  headerbar:backdrop {
+    background-color: #d5d0cc; }
+  headerbar separator.sidebar {
+    background-color: #154d33; }

headerbar-colors.scss

@@ -0,0 +1,36 @@
+$variant: "light";
+
+@import 'colors';
+@import 'drawing';
+@import 'palette';
+
+$headerbar_color: desaturate($palette_green,5%);
+$headerbar_button_color: lighten($headerbar_color,5%);
+$headerbar_text_color: rgba(255, 255, 255, 1);
+$top_hilight: lighten($headerbar_color, 10%);
+$borders_color: darken($headerbar_color, 5%);
+$headerbar_unfocused_color: lighten($headerbar_color,15%);
+
+headerbar {
+  @include headerbar_fill($headerbar_color);
+  color: $headerbar_text_color;
+  
+  button {
+    @include button(normal, $headerbar_button_color, $headerbar_text_color);
+    
+    &.flat, &.titlebutton { @include button(undecorated); }
+    
+    &:hover { @include button(hover, $headerbar_button_color, $headerbar_text_color); }
+    
+    &:active,
+      &:checked { @include button(active, $headerbar_button_color, $headerbar_text_color); }
+
+    
+  }
+
+  &:backdrop {
+    background-color: $backdrop_borders_color;
+  }
+
+  separator.sidebar { background-color: darken($headerbar_color,20%); }
+}