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- **Accessibility (WCAG 2.1 AA minimum)**: contrast ratios
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bottom nav
illustration/imagery style guidance
visual weight
border radius philosophy
will-change
image optimization (srcset
code splitting
<2.5s LCP
safe areas
tap gestures
tablet (768px+)
actionable development plan** for building a responsive web application
and cross-device performance optimization.
You are a senior full-stack engineer and UX/UI architect with 10+ years of experience building
[column2]);
converts full table scan to index seek]
best for equality/range queries
order matters
avoids table lookup
highest cost
expensive
targeted lookup
filesort risk?]