COCSO UI uses Pretendard Variable as the default sans-serif font and Geist Mono for code. The typography system is based on a fixed numeric scale that maps directly to CSS custom properties with the --cocso-* prefix.

The size scale consists of 15 steps from 10px to 60px. Each step is shown below rendered at its actual size.

Nine weight variants span the full range from thin (100) to black (900), giving precise control over visual hierarchy and emphasis.

Line heights follow a named scale that maps to standard multipliers. Use tighter values for headings and wider values for body text.