Generates a modular type scale from a base size and ratio (musical intervals or the golden ratio, or your own), with steps above and below, t-shirt, heading or numeric names, and line heights that tighten as sizes grow (or a fixed value). Fluid mode turns the larger steps into clamp() expressions that grow between two viewport widths. Output as CSS custom properties with utility classes, a Tailwind fontSize config or JSON; the preview renders the specimen at every step. Everything runs locally.