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HTML

              
                .c-header 
  h2.c-header__title Page header
  p.c-header__tagline Nifty slogan
  nav.c-header__nav.c-nav
    ul.c-nav__list
      li.c-nav__item
        a(href="#").c-nav__link sub page
      li.c-nav__item
        a(href="#").c-nav__link sub page
      li.c-nav__item
        a(href="#").c-nav__link sub page
      
              
            
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CSS

              
                //---------------//
// Mixins library 
//---------------//
// CSS Variables with fallback
@mixin var($property, $value, $fallback, $imp:null) {
  #{$property}: $fallback;
  #{$property}: var($value) $imp;
}
/*------------------------------------*\
		THEMER - abstracts/_themer.scss
\*------------------------------------*/
//1. text contrast
@function theme-text($color) {
	@if (lightness($color) > 55) {
		@return #222; // Lighter bg, return dark color
	}
	@else {
		@return #fff; // Darker bg, return light color
	}
}
//identify brand colour -- in production we actually  map get the colours from a list in settings, but let's not get diverted...
$brand: #f50;
// set fallback brand theme for ie11
//---------------//
$theme: $brand;
$theme-text: theme-text($brand);

// NOW, THEMEING CONVENTIONS OF THIS DESIGN

@mixin theme { //basically theme any block
    @include var(background-color, --theme, $theme);
    @include var(color, --theme-text, $theme-text);
}
@mixin monotheme { //return any block to black and white
    --theme: white;
    --theme-text: #222;
}
@mixin fliptheme { //flip any block
    @include var(color, --theme, $theme);
    @include var(background-color, --theme-text, $theme-text)
}

:root {
  --theme: #{$theme};
  --theme-text: #{$theme-text};
}
// you might generate theme classes here, see 

// END THEMER PARTIAL //
body {padding:1em; max-width:37.5em; color: currentColor;
  a {color: currentColor; text-decoration:none; &:hover,&:focus {text-decoration:underline}}
}
/*------------------------------------*\
		Header | components/_header.scss
\*------------------------------------*/

.c-header {
  font:100 2em Futura, sans-serif;
  padding:1em;
  @include theme;
  
  &__nav {@include fliptheme;}
}



              
            
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JS

              
                
              
            
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999px

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