Sass’s killer feature was truly the @import statement. When a Sass file is imported, all the variables and mixins defined previously are now available in any subsequent imported file. So, it is very good practice to define a single top-level stylesheet that you link to from the <HEAD> of your page layout. In a Rails implementation, this would likely be the application.scss. This root file is then
![Sass Pathways](https://cdn-ak-scissors.b.st-hatena.com/image/square/beac31a4be8e4962e2fefc94fd70b667eb3e9cec/height=288;version=1;width=512/https%3A%2F%2Fimages.thoughtbot.com%2Fblog-images%2Fsocial-share-default.png)