Identity-anchored fluid responsive design system. Converts hard-pixel typography and spacing into a single continuous clamp() scale where each clamp's MAX equals the brand's existing desktop value and its MIN equals the existing small-screen value — so a live, brand-locked product renders pixel-identical at both anchor widths and only gains smooth interpolation in between (zero visual risk to adopt). Bundles ch-based measure, ISO-216 / A4 print, accessibility-safe zoom (mandatory rem term), and palette / zero-JS guardrails, plus a clamp generator script and a review checklist. Use when building or auditing responsive CSS; designing a type or spacing scale; fluid typography; viewport / iPhone scaling; clamp(); modular scale; print stylesheets; or migrating an existing brand to fluid type without a redesign.
2026-05-17