evt-angular-ovi/src/assets/scss/_themes.scss

$themes: (
    neutral: (
        baseColorDark: #000,
        baseColorLight: #fff,
        baseBorder: rgba(0, 0, 0, 0.125),
        secondaryColorDark: #555,
        secondaryColorLight: #fff,
        panelBackgroundColor: #fff,
        panelTextColor: #000,
        panelSecondaryBackgroundColor: rgba(255, 255, 255, 0.95),
        toolsBackground: #fff,
        toolsBackgroundDarker: #ccc,
        toolsColor: #000,
        toolsColorActive: #ffdd00,
        appEntryBoxBackground: #f5f5f5,
        appEntryBoxActiveTabBg: #e7e7e7,
    ),
    modern: (
        baseColorDark: #263238,
        baseColorLight: #ECEFF1,
        baseBorder: rgba(0, 0, 0, 0.125),
        secondaryColorDark: #607d8b,
        secondaryColorLight: #ECEFF1,
        panelBackgroundColor: #fff,
        panelTextColor: #000,
        panelSecondaryBackgroundColor: rgba(236, 239, 241, 0.95),
        toolsBackground: #ECEFF1,
        toolsColor: #263238,
        toolsBackgroundDarker: #b0bec5,
        toolsColorActive: #ffdd00,
        appEntryBoxBackground: #f1f4f5,
        appEntryBoxActiveTabBg: #eaecec,
    ),
    classic: (
        baseColorDark: rgb(54, 45, 40),
        baseColorLight: rgb(245, 234, 212),
        baseBorder: rgba(0, 0, 0, 0.125),
        secondaryColorDark: rgb(143, 119, 106),
        secondaryColorLight: rgb(245, 234, 212),
        panelBackgroundColor: #fff,
        panelTextColor: #000,
        panelSecondaryBackgroundColor: rgba(236, 239, 241, 0.95),
        toolsBackground: #f5ead4,
        toolsColor: rgb(54, 45, 40),
        toolsBackgroundDarker: #ccc4ba,
        toolsColorActive: #ffdd00,
        appEntryBoxBackground: #f9f7f5,
        appEntryBoxActiveTabBg: #f2ede9,
    ),
);


// Themify
// This mixin will add a CSS rule for each theme for the CSS rules defined within it.
// The `@each $theme, $map in $themes` tell Sass to loop over the `$themes` map that was defined above.
// On each loop, it assigns these values to `$theme` and `$map` respectively.
// - `$theme` - Theme name
// - `$map` - Map of all theme variables
// Then the `map-get()` function is used to get any theme variable from `$map` and output the correct property for each theme.
// The `&` refer to parent selectors and placing it after `[data-theme="#{$theme}"]` tells Sass to output any parent selectors after the theme name.
// To use this mixin, just be sure that the element for which you are defining the CSS rules is included in a `*[data-theme]="theme-name"` element
// and embody every CSS rule that needs to be themified within the mixin:
// ```
//  btn-primary {
    //  @include themify($themes) {
        //  color: themed('baseColorDark');
    //  }
//  }
// ```
@mixin themify($themes: $themes) {
    @each $theme, $map in $themes {
        :host-context([data-theme="#{$theme}"]) &,
        [data-theme="#{$theme}"] & {
            $theme-map: () !global;
            @each $key, $submap in $map {
                $value: map-get(map-get($themes, $theme), '#{$key}');
                $theme-map: map-merge($theme-map, ($key: $value)) !global;
            }
            @content;
            $theme-map: null !global;
        }
    }
}

// ThemifySelf
// This mixin will add a CSS rule for each theme for the CSS rules defined within it.
// The `@each $theme, $map in $themes` tell Sass to loop over the `$themes` map that was defined above.
// On each loop, it assigns these values to `$theme` and `$map` respectively.
// - `$theme` - Theme name
// - `$map` - Map of all theme variables
// Then the `map-get()` function is used to get any theme variable from `$map` and output the correct property for each theme.
// To use this mixin, just be sure that the element for which you are defining the CSS rules has the `[data-theme]="theme-name"` attribute
// and embody every CSS rule that needs to be themified within the mixin:
// ```
//  btn-primary {
    //  @include themifySelf($themes) {
        //  color: themed('baseColorDark');
    //  }
//  }
// ```
@mixin themifySelf($themes: $themes) {
    @each $theme, $map in $themes {
         &[data-theme="#{$theme}"] {
            $theme-map: () !global;
            @each $key, $submap in $map {
                $value: map-get(map-get($themes, $theme), '#{$key}');
                $theme-map: map-merge($theme-map, ($key: $value)) !global;
            }
            @content;
            $theme-map: null !global;
        }
    }
}

@function themed($key) {
    @return map-get($theme-map, $key);
}