majiayu000/claude-skill-registry-data/mobile-first-design

Claude Code and agent skill by majiayu000/claude-skill-registry-data

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Designs responsive interfaces starting from mobile screens with progressive enhancement for larger devices. Use when building responsive websites, optimizing for mobile users, or implementing adaptive layouts.

Install

npx vskill@latest install majiayu000/claude-skill-registry-data/mobile-first-design

SKILL.md

Mobile-First Design

Design interfaces starting with mobile as the foundation, then enhance for larger screens.

Breakpoints

NameWidthDevices
Mobile320-480pxiPhone SE, small Android
Tablet481-768pxiPad mini
Desktop769-1024pxiPad Pro, laptops
Large1025px+Desktop monitors

Mobile-First CSS

css
/* Base styles (mobile) */
.container {
  padding: 1rem;
}
 
.nav {
  display: none; /* Hidden on mobile */
}
 
.nav-toggle {
  display: block; /* Hamburger visible */
}
 
/* Tablet and up */
@media (min-width: 768px) {
  .container {
    padding: 2rem;
    max-width: 720px;
    margin: 0 auto;
  }
 
  .nav {
    display: flex;
  }
 
  .nav-toggle {
    display: none;
  }
}
 
/* Desktop */
@media (min-width: 1024px) {
  .container {
    max-width: 960px;
  }
}

Touch-Friendly Design

css
/* Minimum touch target: 48x48px */
.button {
  min-height: 48px;
  min-width: 48px;
  padding: 12px 24px;
}
 
/* Adequate spacing */
.list-item {
  padding: 16px;
  margin-bottom: 8px;
}

Performance Requirements

MetricTarget
First Contentful Paint<3s on 3G
JS bundle<100KB gzipped
Total page weight<500KB

Progressive Enhancement

html
<!-- Layer 1: Semantic HTML (works without CSS/JS) -->
<nav>
  <a href="/home">Home</a>
  <a href="/about">About</a>
</nav>
 
<!-- Layer 2: CSS enhances appearance -->
<!-- Layer 3: JS adds interactivity -->

Best Practices

  • Start design at 320px width
  • Use relative units (rem, %, vw)
  • Test on real devices
  • Optimize images for mobile
  • Minimize JavaScript for initial load
  • Ensure readable text without zooming

Security

  • Security scanPassed, 100 of 100Pattern checks on the skill's files.
  • Model reviewPassed

See the full security report

Quality evaluation

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Source

Popularity

7-day trend score
5

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