How do you structure typography scales for responsive UI design?

To structure typography for responsive UI design, combine modular scales, breakpoints, and fluid sizing techniques:

  • Use a modular scale (e.g., 1.25 or 1.33) to set proportional font sizes across headings and body text.

  • Define sizes for each breakpoint (mobile, tablet, desktop) to adjust readability without breaking hierarchy.

  • Ensure line height and spacing adapt too—not just font size—to keep text readable.

  • Test on real devices to verify that your visual hierarchy holds across screen sizes.

For a deep dive, see Typography in UX/UI: A Complete Guide on the Supercharge Design blog. This ensures your typography feels consistent and legible no matter the device.