UI Design Skill (Web)

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MANDATORY: WCAG 2.1 AA Compliance

These rules are NON-NEGOTIABLE. Every UI element must pass these checks.

1. Color Contrast (CRITICAL)

Text Contrast Requirements:
├── Normal text (<18px): 4.5:1 minimum
├── Large text (≥18px bold or ≥24px): 3:1 minimum
├── UI components (buttons, inputs): 3:1 minimum
└── Focus indicators: 3:1 minimum

FORBIDDEN COLOR COMBINATIONS:
✗ gray-400 on white (#9CA3AF on #FFFFFF = 2.6:1) - FAILS
✗ gray-500 on white (#6B7280 on #FFFFFF = 4.6:1) - BARELY PASSES
✗ white on yellow - FAILS
✗ light blue on white - USUALLY FAILS

SAFE COLOR COMBINATIONS:
✓ gray-700 on white (#374151 on #FFFFFF = 9.2:1)
✓ gray-600 on white (#4B5563 on #FFFFFF = 6.4:1)
✓ gray-900 on white (#111827 on #FFFFFF = 16:1)
✓ white on gray-900, blue-600, green-700

2. Visibility Rules (CRITICAL)

ALL BUTTONS MUST HAVE:
✓ Visible background color OR visible border (min 1px)
✓ Text color that contrasts with background
✓ Minimum height: 44px (touch target)
✓ Padding: at least px-4 py-2

NEVER CREATE:
✗ Buttons with transparent background AND no border
✗ Text same color as background
✗ Ghost buttons without visible borders
✗ White text on light backgrounds
✗ Dark text on dark backgrounds

3. Required Element Styles

// EVERY button needs visible boundaries
// PRIMARY: solid background
<button className="bg-gray-900 text-white px-4 py-3 rounded-lg">
  Primary
</button>

// SECONDARY: visible background
<button className="bg-gray-100 text-gray-900 px-4 py-3 rounded-lg">
  Secondary
</button>

// GHOST: MUST have visible border
<button className="border border-gray-300 text-gray-700 px-4 py-3 rounded-lg">
  Ghost
</button>

// NEVER DO THIS:
<button className="text-gray-500">Invisible Button</button> // ✗ NO BOUNDARY
<button className="bg-white text-white">Hidden</button>     // ✗ NO CONTRAST