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name: responsive-design description: Mobile-first responsive design specialist for SARAISE React/TypeScript/Tailwind applications. Provides guidance on breakpoints, fluid typography, flexible layouts, touch targets, and progressive enhancement. Use when creating responsive layouts, optimizing for mobile, or ensuring cross-device compatibility. status: ✅ Working last-validated: 2025-01-02

Responsive Design Principles

Status: ✅ Last Validated: 2025-01-02

Purpose

Invoked when creating responsive layouts or optimizing SARAISE UI for mobile/tablet devices. Provides mobile-first design principles aligned with Tailwind CSS breakpoints and SARAISE design system.

Mobile-First Approach

• Design for mobile first, then scale up
• Progressive enhancement over graceful degradation
• Touch targets minimum 44x44px
• Avoid hover-only interactions
• Test on real devices

Breakpoints (Tailwind CSS)

• sm: 640px (mobile landscape) - @media (min-width: 640px)
• md: 768px (tablet portrait) - @media (min-width: 768px)
• lg: 1024px (tablet landscape / small desktop) - @media (min-width: 1024px)
• xl: 1280px (desktop) - @media (min-width: 1280px)
• 2xl: 1536px (large desktop) - @media (min-width: 1536px)

Fluid Typography

• Use rem for font sizes
• Base size: 16px
• Scale: 1.125 (major second) or 1.2 (minor third)
• Use clamp() for fluid scaling
• Line length: 45-75 characters optimal

Flexible Layouts (Tailwind)

• Use grid classes for page layouts (grid-cols-1 md:grid-cols-2 lg:grid-cols-3)
• Use flex classes for component layouts (flex flex-col md:flex-row)
• Avoid fixed widths, use w-full with max-w-*
• Content containers: max-w-7xl mx-auto px-4 sm:px-6 lg:px-8
• Use gap-* instead of margins in flex/grid (gap-4, gap-6)

Images & Media

• Use responsive images (srcset, sizes)
• Use object-fit for aspect ratios
• Lazy load below-the-fold images
• Optimize for different densities (@1x, @2x)
• Use CSS for simple graphics

Common Patterns

• Hamburger menu for mobile navigation
• Card layouts that stack on mobile
• Side-by-side columns that stack
• Hidden elements on mobile (use wisely)
• Bottom navigation on mobile apps

Testing

• Test on actual devices
• Use browser DevTools device mode
• Test at various viewport sizes
• Test with slow connections
• Test landscape and portrait orientations