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HTML

              
                <html>
  <h3>Theme</h3>
  <block style="background:var(--color-primary);color:var(--color-primary-text)" class="first">P</block>
  <block style="background:var(--color-secondary);color:var(--color-secondary-text)">S</block>
  <block style="background:var(--color-highlight);color:var(--color-highlight-text)">H</block>
  
  <h3>Complementary</h3>
  <block class="complementary">C</block>
  <block class="complementary alt">C</block>
  <block class="complementary light">CL</block>
  <block class="complementary light alt">CL</block>
  <block class="complementary dark" style="color:var(--color-primary-text)">CD</block>
  <block class="complementary dark alt" style="color:var(--color-primary-text)">CD</block>
  
  <h3>Split Complementary</h3>
  <block class="split-complementary">SC</block>
  <block class="split-complementary alt">SC</block>
  <block class="split-complementary alt-2">SC</block>
  
  <h3>Triadic</h3>
  <block class="triadic">T</block>
  <block class="triadic alt">T</block>
  <block class="triadic alt-2">T</block>
  
  <h3>Analagous</h3>
  <block class="analagous">A</block>
  <block class="analagous alt">A</block>
  <block class="analagous alt-2">A</block>
  
  <h3>Tetradic</h3>
  <block class="tetradic">T</block>
  <block class="tetradic alt">T</block>
  <block class="tetradic alt-2">T</block>
  <block class="tetradic alt-3">T</block>
  
  <h3>Shades/Tint</h3>
  <block class="luma l00">0</block>
  <block class="luma l10">10</block>
  <block class="luma l20">20</block>
  <block class="luma l30">30</block>
  <block class="luma l40">40</block>
  <block class="luma l50">50</block>
  <block class="luma l60">60</block>
  <block class="luma l70">70</block>
  <block class="luma l80">80</block>
  <block class="luma l90">90</block>
  <block class="luma l100">00</block>
  
    
  <h3>Tones</h3>
  <block class="chroma c00">0</block>
  <block class="chroma c10">10</block>
  <block class="chroma c20">20</block>
  <block class="chroma c30">30</block>
  <block class="chroma c40">40</block>
  <block class="chroma c50">50</block>
  <block class="chroma c60">60</block>
  <block class="chroma c70">70</block>
  <block class="chroma c80">80</block>
  <block class="chroma c90">90</block>
  <block class="chroma c100">00</block>
  
  
  <h3>MIX</h3>
  <block class="mix m00">0</block>
  <block class="mix m10">10</block>
  <block class="mix m20">20</block>
  <block class="mix m30">30</block>
  <block class="mix m40">40</block>
  <block class="mix m50">50</block>
  <block class="mix m60">60</block>
  <block class="mix m70">70</block>
  <block class="mix m80">80</block>
  <block class="mix m90">90</block>
  <block class="mix m100">00</block>
  
  <h3>Test</h3>
  <block style="background:var(--test-color-0)">T0</block>
  <block style="background:var(--test-color-1)">T1</block>
  <block style="background:var(--test-color-2)">T2</block>
  <block style="background:var(--test-color-3)">T3</block>
  <block style="background:var(--test-color-4)">T4</block>
  <block style="background:var(--test-color-5)">T5</block>
  <block style="background:var(--test-color-6);color:var(--color-highlight-text)">T6</block>
  <block style="background:var(--test-color-7);color:var(--color-highlight-text)">T7</block>
  
</html>
              
            
!

CSS

              
                /* 
* Erik Codekraft - 2022
* https://github.com/erikyo/
*/

/// Output the value for the property
/// @param {number or string} $val - the base value
/// @param {number} $val2 - the value to sum
/// @output the result or the css string calc(val1 + val2)
@function set_value($val, $val2) {
	@if (type-of($val) == string) {
		@return calc(#{$val} + #{$val2});
	} @else {
		@return $val + $val2;
	}
}

/// Output a hsl color variation for a custom property
/// @param {list} $color - the Hue Saturation Luminosity values of the base color
/// @param {number} $hue - corresponds to the hue rotate scss function
/// @param {percentage} $saturation - corresponds to the saturate/desaturate scss function
/// @param {percentage} $luminosity - corresponds to the lighten/darken scss function
/// @param {percentage} $alpha - makes the colour transparent (the colour becomes a hsla)
/// @output a hsl color custom property in hsl or hsla depends on if the alpha argument has been passed
@function gen-custom-prop($color, $hue: false, $saturation: false, $luminosity: false, $alpha: false) {

	@if (type_of($color) == string) {
		@error("Error in _variables.scss: colors needs to be a list like 150, 100%, 50% and not " + $color)
	}

	$h: nth($color, 1);
	$s: nth($color, 2);
	$l: nth($color, 3);

	@if($hue != false) {
		$h: set_value($h, $hue);
	}

	@if($saturation != false) {
		$s: set_value($s, $saturation);
	}

	@if($luminosity != false) {
		$l: set_value($l, $luminosity);
	}

	@if($alpha != false) {
		@return unquote("hsla(#{$h}, #{$s}, #{$l}, #{$alpha})");
	}

	@return unquote("hsl(#{$h}, #{$s}, #{$l})");
}

// THE SCSS WAY
// primary color
$color-primary: var(--color-hue), var(--color-sat), var(--color-luma);
$color-primary-text: var(--color-hue), calc(var(--color-sat) - 18%), calc(var(--color-luma) + 50%);

// secondary color
$color-secondary: var(--color-hue), var(--color-sat--secondary), calc(var(--color-luma) + 40%);
$color-secondary-text: var(--color-hue), var(--color-sat--secondary), calc(var(--color-luma) - 60%);

// highlight
$color-highlight: var(--color-hue--highlight), var(--color-sat), var(--color-luma);
$color-highlight-text: var(--color-hue--highlight), calc(var(--color-sat) + 18%), calc(var(--color-luma) + 50%);

// export vars as CSS vars
:root {

	// test
	--color-hue: 312;
	--color-hue--highlight: calc(var(--color-hue) + 150);

	--color-sat: 26%;
	--color-sat--secondary: calc(var(--color-sat) - 21%);

	--color-luma: 52%;
	--color-luma-white: 100%;

	--color-primary: hsl(#{$color-primary});
	--color-primary-text: hsl(#{$color-primary-text});
	--color-secondary: hsl(#{$color-secondary});
	--color-secondary-text: hsl(#{$color-secondary-text});
	--color-highlight: hsl(#{$color-highlight});
	--color-highlight-text: hsl(#{$color-highlight-text});
  
	--color-white: hsl(0,0%,var(--color-luma-white));
  --color-black: hsl(0,0%,calc(var(--color-luma-white) * 0.05));

	--test-color-0: #{gen-custom-prop( $color-primary )};
	--test-color-1: #{gen-custom-prop( ( var(--color-hue--highlight), 2%, 100% ) )};
	--test-color-2: #{gen-custom-prop( ( var(--color-hue--highlight), 50%, 0% ) , -30, 20%, +80%, .5 )};
	--test-color-3: #{gen-custom-prop( ( var(--color-hue), 4%, 50% ) )};
	--test-color-4: #{gen-custom-prop( $color-primary, -10 )};
	--test-color-5: #{gen-custom-prop( $color-primary, false, 30% )};
	--test-color-6: #{gen-custom-prop( $color-secondary, -120, 20%, -50% )};
	--test-color-7: #{gen-custom-prop( $color-highlight, 60, false, false, 50% )};
}

$size: 80px;

html {
  background-color: var(--color-black);
  font-family: monospace;
}

h3 {
  color: var(--color-white);
  float: left;
  clear: left;
  margin: $size * .25 $size * .1 0;
  letter-spacing: $size * .1;
  font-size: $size * .3;
  font-weight: 300;
}

block {
  
  &.complementary {
    background-color: var(--color-primary);
    &.alt { background-color: #{gen-custom-prop( $color-primary, 180 )}; }
    &.light { background-color: #{gen-custom-prop( $color-primary, false, false, 25% )}; }
    &.light.alt { background-color: #{gen-custom-prop( $color-primary, 180, false, 25% )}; }
    &.dark { background-color: #{gen-custom-prop( $color-primary, false, false, -25% )}; }
    &.dark.alt { background-color: #{gen-custom-prop( $color-primary, 180, false, -25% )}; }
  }
  
  &.split-complementary {
    background-color: var(--color-primary);
    &.alt { background-color: #{gen-custom-prop( $color-primary, 150 )}; }
    &.alt-2 { background-color: #{gen-custom-prop( $color-primary, -150 )}; }
  }
  
  &.triadic {
    background-color:var(--color-primary);
    &.alt { background-color: #{gen-custom-prop( $color-primary, 120 )}; }
    &.alt-2 { background-color: #{gen-custom-prop( $color-primary, -120 )}; }
  }
  
  &.analagous {
    background-color: var(--color-primary);
    &.alt { background-color: #{gen-custom-prop( $color-primary, 30 )}; }
    &.alt-2 { background-color: #{gen-custom-prop( $color-primary, 60 )}; }
  }
  
  &.tetradic {
    background-color: var(--color-primary);
    &.alt { background-color: #{gen-custom-prop( $color-primary, 90 )}; }
    &.alt-2 { background-color: #{gen-custom-prop( $color-primary, 180 )}; }
    &.alt-3 { background-color: #{gen-custom-prop( $color-primary, 270 )}; }
  }
  
  &.luma {
    &.l00 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 0% ) ) }}
    &.l10 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 10% ) ) }}
    &.l20 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 20% ) ) }}
    &.l30 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 30% ) ) }}
    &.l40 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 40% ) ) }}
    &.l50 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 50% ) ) }}
    &.l60 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 60% ) ) }}
    &.l70 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 70% ) ) }}
    &.l80 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 80% ) ) }}
    &.l90 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 90% ) ) }}
    &.l100 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 100% ) ) }}
  }
  
  &.chroma {
    &.c00 { background-color: #{gen-custom-prop( ( var(--color-hue), 0%, 50% ) ) }}
    &.c10 { background-color: #{gen-custom-prop( ( var(--color-hue), 10%, 50% ) ) }}
    &.c20 { background-color: #{gen-custom-prop( ( var(--color-hue), 20%, 50% ) ) }}
    &.c30 { background-color: #{gen-custom-prop( ( var(--color-hue), 30%, 50% ) ) }}
    &.c40 { background-color: #{gen-custom-prop( ( var(--color-hue), 40%, 50% ) ) }}
    &.c50 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 50% ) ) }}
    &.c60 { background-color: #{gen-custom-prop( ( var(--color-hue), 60%, 50% ) ) }}
    &.c70 { background-color: #{gen-custom-prop( ( var(--color-hue), 70%, 50% ) ) }}
    &.c80 { background-color: #{gen-custom-prop( ( var(--color-hue), 80%, 50% ) ) }}
    &.c90 { background-color: #{gen-custom-prop( ( var(--color-hue), 90%, 50% ) ) }}
    &.c100 { background-color: #{gen-custom-prop( ( var(--color-hue), 100%, 50% ) ) }}
  }
  
&.mix {
    &.m00 { background-color: #{gen-custom-prop( ( var(--color-hue), 0%, 0% ) ) }}
    &.m10 { background-color: #{gen-custom-prop( ( var(--color-hue), 10%, 10% ) ) }}
    &.m20 { background-color: #{gen-custom-prop( ( var(--color-hue), 20%, 20% ) ) }}
    &.m30 { background-color: #{gen-custom-prop( ( var(--color-hue), 30%, 30% ) ) }}
    &.m40 { background-color: #{gen-custom-prop( ( var(--color-hue), 40%, 40% ) ) }}
    &.m50 { background-color: #{gen-custom-prop( ( var(--color-hue), 50%, 50% ) ) }}
    &.m60 { background-color: #{gen-custom-prop( ( var(--color-hue), 60%, 60% ) ) }}
    &.m70 { background-color: #{gen-custom-prop( ( var(--color-hue), 70%, 70% ) ) }}
    &.m80 { background-color: #{gen-custom-prop( ( var(--color-hue), 80%, 80% ) ) }}
    &.m90 { background-color: #{gen-custom-prop( ( var(--color-hue), 90%, 90% ) ) }}
    &.m100 { background-color: #{gen-custom-prop( ( var(--color-hue), 100%, 100% ) ) }}
  }
  
  display: block;
  float: left;
  width: $size;
  height: $size;
  line-height: $size;
  text-align: center;
  font-size: $size * .5;
  padding: 0;
  margin: $size * .1;
  border-radius: $size * .1;
  border: $size * .05 solid #{gen-custom-prop( (0,0%,var(--color-luma-white)), false, false, false, 50% )};
  
  h3 + & {
    clear: left;
  }
  
}
              
            
!

JS

              
                
              
            
!
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