gnome-shell-dark-theme/gnome-shell-sass/_high-contrast-colors.scss

//
// High Contrast theme definitions
//
// this is an always dark theme, so no 'light' theme conditions

@import '_palette.scss';
@import '_default-colors.scss';

// global colors
$base_color: $dark_5;
$bg_color: lighten($base_color, 10%);
$fg_color: $light_1;

// OSD elements
$osd_fg_color: $light_1;
$osd_bg_color: $base_color;

// system elements
$system_base_color: $dark_5;
$system_fg_color: $light_1;

// panel colors
$panel_bg_color: $dark_5;
$panel_fg_color: $light_1;

// card elements
$card_bg_color: $bg_color;
$card_shadow_color: transparent;
$card_shadow_border_color: $card_bg_color;

//
// Derived Colors
//
// colors based on the global defines above

// borders
$borders_color: transparentize($fg_color, $border_opacity);
$outer_borders_color: $borders_color;

// osd colors
$osd_borders_color: transparentize($osd_fg_color, 0.8);
$osd_outer_borders_color: $osd_borders_color;

// system colors
$system_bg_color: lighten($system_base_color, 5%);
$system_borders_color: transparentize($system_fg_color, .9);
$system_insensitive_fg_color: mix($system_fg_color, $system_bg_color, 50%);
$system_overlay_bg_color: mix($system_bg_color, $system_fg_color, 90%);

// insensitive state
$insensitive_fg_color: $fg_color;
$insensitive_bg_color: mix($bg_color, $base_color, 60%);
$insensitive_borders_color: $borders_color;

// checked state
$checked_bg_color: lighten($bg_color, 18%);
$checked_fg_color: lighten($fg_color, 18%);

// hover state
$hover_bg_color: lighten($bg_color, 20%);
$hover_fg_color: lighten($fg_color, 20%);

// active state
$active_bg_color: lighten($bg_color, 22%);
$active_fg_color: lighten($fg_color, 22%);

// accent colors
$accent_borders_color: st-lighten(-st-accent-color, 30%);

//
// High Contrast specific definitions
//

// color for outline drawn onto all elements (may be a border or a box-shadow)
$hc_inset_color: transparentize($fg_color, 0.6);

// color used in a mixin in _drawing to boost a color's contrast
$hc_mix_color: $light_1;

// the mix factor used to boost contrast of a color in the above mixin
$hc_mix_factor: 87%;