There are hundreds of devices out there right now that can access the full web, as Steve Jobs once put it. They come with different capabilities and constraints, things like input style or screen size, resolution, and form. With all these devices set to overtake traditional desktop computers for web traffic next year, we need tools to help us build responsively. Jonathan Smiley shows how to dive into responsive design using Foundation, a light front-end framework that helps you rapidly build prototypes and production sites.