Shopify for iPhone forms

I've been working on a new forms design for Shopify for iPhone to:

a) better distinguish between labels and inputs of fields
b) highlight active/filled fields over empty ones (and distinguish the two)
c) use coloured field labels for validation purposes
d) break up content using section headers, group dividers, and columns for a pleasing layout

It's important because a good portion of the app is forms.

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