I've just spent the last week building a simple bookmark app (front-end and back-end) with both Foundation and Bootstrap, with the goal of getting very familiar

I've just spent the last week building a simple bookmark app (front-end and back-end) with both Foundation and Bootstrap, with the goal of getting very familiar with both of them. In that context, Pure looks great, congratulations. IMO the goal of these frameworks should be to enable the use of most common design patterns, while normalizing across browsers and enabling responsive design. We used to write our own JS for these patterns (tabs, navigation etc) and then JQuery made that easier. Now these frameworks are going one step further and giving us these patterns ready-to-go. My only suggestion would be to ensure that the most common design patterns are handled by your framework. (Based on my experience, a suggestion that would be nice to have. For reference, its the design pattern behind the menu system that Wordpress uses: a nice "menu" list as a sidebar, like on your site, that allows flyouts or accordion style behavior.)