First I extracted 3 css files from "styles.php": "layout.css", "typographie.css"...

First I extracted 3 css files from "styles.php": "layout.css", "typographie.css" and "color.css". This leads to better handling and the files can be better overlooked. When woring on the color you find only this definitions in one file, them sam econcerns to typhographie and layout (positioning, measurement of objects, borders etc.)

I started to resort the css files and added comments to make them easier readable and understandable.

The file "typography.css" is not jet sorted.