1. THE THREE SHAPES — dark then light (only "fields" differs)
2. ICONS — flag on phone, globe on email, 40px in a left gutter
3. ICONS x SHAPE — the gutter has to work in all three
4. MIXED — one icon only, in a two-row widget
5. INLINE LAYOUT — one arrow beside the group, never two
6. MODES — rows: full=2, email=1, phone=1
7. ACCENT + RADIUS — button corners should match the fields with no radius passed
8. SYNONYMS — three boxed, two split, three pill
9. BAD VALUES — must fall back, never break
10. BUTTON LABEL