CleverCSS

CleverCSS is a small markup language for CSS inspired by Python that can be used to build a style sheet in a clean and structured way. In many ways it's cleaner and more powerful than CSS2 is.

The most obvious difference to CSS is the syntax: it is indentation based and not flat. While this is obviously against the Python Zen, it's nonetheless a good idea for structural styles.

Nutshell

To get an idea of how CleverCSS works you can see a small example below. Note the indentation based syntax and how you can nest rules:

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

Of course you can do the very same in CSS, but because of its flat nature the code would look more verbose. The following piece of code is the CleverCSS output of the above file:

ul#comments,
ol#comments {
  margin: 0;
  padding: 0;
}

ul#comments li,
ol#comments li {
  padding: 0.4em;
  margin: 0.8em 0 0.8em;
}

ul#comments li h3,
ol#comments li h3 {
  font-size: 1.2em;
}

ul#comments li p,
ol#comments li p {
  padding: 0.3em;
}

ul#comments li p.meta,
ol#comments li p.meta {
  text-align: right;
  color: #dddddd;
}

But that's only a small example of what you can do with CleverCSS. Have a look at the following documentation of CleverCSS for more details.