typography

# Typography Type is most of your UI. The system does the hard parts — optical sizes, tracking tables, Dynamic Type — *if* you use its APIs. This skill covers when to trust the system, how to build hierarchy deliberately, and what custom fonts owe you back. ## When This Skill Activates - Choosing fonts or building a type hierarchy for a screen or app - Text truncating, cramping, or breaking under larger Dynamic Type sizes - Adopting a custom/brand font (and keeping accessibility) - Display typesetting: hero numbers, stats, editorial headlines ## Rule 1: text styles first Predefined styles (Large Title → Caption 2) are weight + size + leading combos with Dynamic Type support built in — and different styles scale *differently* (body grows more than footnote), which manual font sizes can't replicate. - Build hierarchy from 2–3 text styles + emphasized variants (bold trait — the actual weight varies per style: some go medium→semibold, others bold→heavy) before reaching for new fonts. - Semantic colors + text styles together give dark mode, contrast, and Dynamic Type for free. - macOS supports text styles (without Dynamic Type); design Mac type at 100% — no iOS-style scaling assumptions. ## Rule 2: let optical sizes and tracking work - San Francisco blends Text→Display designs **continuously between 17 and 28pt** (below: sturdier letterforms, looser tracking for legibility; above: tighter, more refined). System font APIs do this automatically — hardcoded single-cut...