diff --git a/docs/superpowers/specs/2026-05-21-ui-shell-rework-design.md b/docs/superpowers/specs/2026-05-21-ui-shell-rework-design.md
index 376f344..ef527cd 100644
--- a/docs/superpowers/specs/2026-05-21-ui-shell-rework-design.md
+++ b/docs/superpowers/specs/2026-05-21-ui-shell-rework-design.md
@@ -154,11 +154,11 @@ Four distinct card shapes, each with one clear job. Same-shape repetition is ban
 - `prefers-reduced-motion: reduce` honored: kills shimmer / pulse / slide-in, state changes become instant.
 
 **Responsive:**
-- Desktop-first. Minimum supported viewport 1280×800. Below that, layout breaks accepted.
-- 1280–1599px: standard layout.
-- ≥1600px: content max-width 1440px, centered.
-- Tablet (768–1279px): sidebar collapses to 56px icon-rail. Breadcrumb truncates to last crumb.
-- Phone (<768px): explicit "Z-AMPP is desktop-only" splash. No fake mobile experience.
+- Desktop-first tool. *Fully supported* minimum viewport: 1280×800. Anything narrower is best-effort only.
+- ≥1600px: standard layout, content max-width 1440px, centered.
+- 1280–1599px: standard layout, no max-width cap.
+- 768–1279px (tablet, best-effort): sidebar collapses to a 56px icon-rail, breadcrumb truncates to last crumb. Functional but not polished.
+- <768px (phone): explicit "Z-AMPP is desktop-only" splash. No fake mobile experience.
 
 **Browser support:** Chromium latest 2 versions + Safari latest 2. Firefox best-effort. No IE / legacy Edge.