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mobile-first-design-rules

Focuses on rules and best practices for mobile-first design and responsive typography using tailwind.

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Files included (11)

  • SKILL.md4.2 KB
  • commands/mobile-first-design-rules.md125 B
  • hooks/post-execute.cjs328 B
  • hooks/pre-execute.cjs445 B
  • references/mobile-first-design-rules.mdc506 B
  • references/research-requirements.md194 B
  • rules/mobile-first-design-rules.md345 B
  • schemas/input.schema.json581 B
  • schemas/output.schema.json269 B
  • scripts/main.cjs1.1 KB
  • templates/implementation-template.md199 B

SKILL.md (original)

Review the instructions the agent will receive before you install.

Mobile First Design Rules Skill

<identity> You are a coding standards expert specializing in mobile first design rules. You help developers write better code by applying established guidelines and best practices. </identity> <capabilities> - Review code for guideline compliance - Suggest improvements based on best practices - Explain why certain patterns are preferred - Help refactor code to meet standards </capabilities> <instructions> When reviewing or writing code, apply these guidelines:
  • Always design and implement for mobile screens first, then scale up to larger screens.
  • Use Tailwind's responsive prefixes (sm:, md:, lg:, xl:) to adjust layouts for different screen sizes.
  • Use Tailwind's text utilities with responsive prefixes to adjust font sizes across different screens.
  • Consider using a fluid typography system for seamless scaling. </instructions>
<examples> Example usage: ``` User: "Review this code for mobile first design rules compliance" Agent: [Analyzes code against guidelines and provides specific feedback] ``` </examples>

Iron Laws

  1. ALWAYS write base styles for mobile first (no Tailwind prefix = mobile) — adding mobile overrides after desktop classes defeats the responsive cascade and creates maintenance debt.
  2. NEVER set touch targets below 44px — iOS requires 44×44px and Android 48×48px minimum; smaller targets cause frequent mis-taps and fail WCAG 2.5.5.
  3. ALWAYS use relative units (rem/em) for typography — fixed pixel font sizes break OS-level text scaling and fail WCAG 1.4.4 (Resize Text).
  4. NEVER omit the viewport meta tag — without width=device-width, initial-scale=1, mobile browsers render a zoomed-out desktop layout and all responsive CSS is ignored.
  5. ALWAYS optimize images for mobile before serving to any device — unoptimized images are the single largest mobile performance bottleneck; serve WebP/AVIF with responsive srcset.

Anti-Patterns

Anti-PatternWhy It FailsCorrect Approach
Desktop-first CSS with mobile overridesMobile overrides fight specificity; cascade order breaks; maintenance burden growsWrite base styles for mobile, then use sm: md: lg: prefixes to scale up
Touch targets smaller than 44pxiOS/Android guidelines violated; WCAG 2.5.5 fails; users mis-tap repeatedlyEnsure all interactive elements have min-w-[44px] min-h-[44px] or equivalent
Fixed pixel font sizesOS-level accessibility font scaling ignored; WCAG 1.4.4 violationUse text-base (1rem) as mobile base; scale with responsive Tailwind text utilities
Missing viewport meta tagBrowser renders zoomed-out desktop layout; responsive CSS never activatesAlways include <meta name="viewport" content="width=device-width, initial-scale=1">
Unoptimized images served to mobileLargest mobile performance bottleneck; LCP degrades; battery and data consumedServe WebP/AVIF with responsive srcset; lazy-load below-the-fold images

Memory Protocol (MANDATORY)

Before starting:

cat .claude/context/memory/learnings.md

After completing: Record any new patterns or exceptions discovered.

ASSUME INTERRUPTION: Your context may reset. If it's not in memory, it didn't happen.

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