Today we’ll experiment some more with the adjacent and general sibling combinator and the :checked pseudo-class. Using hidden inputs and labels, we will create an accordion that will animate the content areas on opening and closing.

Making shapes with clipping paths in CSS

The Dark Corners of Your UI

A good article when considering mobile typography

Excellent article on style guides

A look at good and bad uses of off canvas UX patterns

The Importance of Having a Brand Platform

Device-Agnostic - A great post by Trent Walton

Continuum

Pretty nice looking font icons, might be worth a try?