We use Hind as our default typeface, both for printing and digital use. The font is open-source, and it also includes 897 characters, meaning it support many languages.
Too many type sizes and styles at once can wreck any layout. Avoid having several sizes in your layouts to keep the work simple and clean. Our recommended sizes and styles balance content density and reading comfort under typical usage conditions.
We use flat design and usually solid colors. But gradients are also welcome as long as they do not have too much contrast in the spectrum.