Front-End UI/UX Repair & Responsive Engineering

Live Before-vs-After Responsive UI & Usability Workbench

Toggle real-world CSS/JS interface patches below and switch between 375px Mobile, 768px Tablet, and 1280px Desktop viewports. Watch how fixing horizontal flex/grid overflow, 44px touch targets, modal focus traps, and CLS layout shifts transforms usability and Lighthouse scores in real time.

Lighthouse Perf / A11y

99 / 100

All 4 UI Patches Active

Cumulative Layout Shift

0.00

Zero Horizontal Overflow

1. Toggle UI Patches

Fix #1: CSS Grid & Flex Wrap (`min-w-0`)

Eliminates 480px fixed-width card blowout and horizontal scrollbar on 375px phones.

Fix #2: 44×44px Touch Targets & Button Spacing

Upgrades cramped 22px tap links into ergonomic mobile action controls with clear active states.

Fix #3: WCAG AA Contrast & Semantic Hierarchy

Replaces low-contrast `#475569` on dark slate with accessible tokens and clear status badges.

Fix #4: JS Form Validation & Z-Index Drawer

Fixes silent checkout button failure, adds instant inline validation, and repairs z-index overlap.

2. Applied Code Diff

Clean Semantic Patch

Viewport Simulator:

✓ 0 UI Bugs Detected

app.client-storefront.io/checkout

375px

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