What is CleverCSS?

CleverCSS is a small markup language for CSS, inspired by Python, using a simple and clean structure. It can be used to create a style sheet in a neat and structured way; CleverCSS is the most similar to CSS The obvious difference is the syntax, which is based on indentation and is not monotonous.

CleverCSS is a small Python-inspired markup language for CSS that can be used to create a stylesheet in a clean and structured way. In many ways it is cleaner and more powerful than CSS2.

The most obvious difference between CleverCSS and CSS is the syntax: it is based on indentation and is not monotonous. Although this is obviously against the rules of Python, it is still a good idea for organizing styles.

A small example:

ul#comments, ol#comments:
  margin: 0
  padding: 0

  li:
    padding: 0.4em
    margin: 0.8em 0 0.8em

    h3:
      font-size: 1.2em
    p:
      padding: 0.3em
    p.meta:
      text-align: right
      color: #ddd

However, you can also use attributes:

#main p:
   font->
    family: Verdana, sans-serif
    size: 1.1em
    style: italic

Define constants:

background_color = #ccc
 
#main:
  background-color: $background_color

Implicit Concatenation:

padding: $foo + 2 + 3 $foo - 2
 
// returns: padding: 15 8; if $foo is 10

Calculation:

// calculations with numbers / values
42px + 2                    -> 44px
10px * 2                    -> 20px
1cm + 1mm                   -> 11mm
(1 + 2) * 3                 -> 9
 
// string concatenation
foo + bar                   -> foobar
"blub blah" + "baz"         -> 'blub blahbaz'
 
// You can also calculate with numbers:
#fff - #ccc                 -> #333333
cornflowerblue - coral      -> #00169d
 
// You can also add or subtract a number from it and it will do so for all three channels (red, green, blue):
crimson - 20                -> #c80028

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