Spacing & rhythm

The spacing system is tight by design — fewer steps means fewer accidents.

• Radius — four tokens (sm / default / lg / xl) plus the pill literal.
• Shadow — three (sm, md, lg) plus none.
• Rhythm — five clamp-based layout tokens.

Rule: if a new screen needs a value that isn't here, add it as a token before using it — don't write a one-off literal.