Add LottieFiles motion-design skill

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0119deVM65AKpJiLTLhEdDg9
2026-10-18 21:44:48 +00:00
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+# Context Adaptation
+
+## Platform Scaling
+
+| Platform | Duration Modifier | Complexity | Physics |
+|----------|------------------|------------|---------|
+| Desktop | 1.0x (baseline) | Full | All types |
+| Tablet | 0.9x | Standard | Most types |
+| Mobile | 0.8x | Reduced (1-2 properties) | Snappy only |
+| Watch | 0.6x | Minimal (1 property) | None |
+| TV/Kiosk | 1.3x | Full | All types |
+
+**Mobile rules**: prefer opacity + transform; touch feedback <100ms; reduce stagger budgets by 30%; avoid parallax
+**Desktop opportunities**: hover states, cursor tracking, multi-column stagger, spatial choreography
+
+## Accessibility
+
+### prefers-reduced-motion
+
+| Original Motion | Reduced Alternative |
+|----------------|-------------------|
+| Slide entrance | Opacity fade only |
+| Bounce/spring | Instant or simple ease-out |
+| Parallax | Static positioning |
+| Auto-playing | Paused, user-initiated |
+| Complex choreography | Single fade |
+| Continuous ambient | Static or subtle opacity pulse |
+
+Reduced motion means: remove spatial movement, keep opacity, remove spring easing, reduce duration 50%+, never auto-play loops.
+
+### Vestibular Triggers (avoid or provide alternatives)
+- Large-scale zoom, full-screen position transitions
+- Spinning elements >100px, parallax >2 layers, rapid direction changes
+
+### Cognitive Accessibility
+- Same interaction = same animation every time
+- Pause controls for animations >5 seconds
+- Don't convey critical info through motion alone
+
+## Performance Budgets
+
+| Tier | Properties | Max Elements |
+|------|-----------|-------------|
+| Optimal | transform, opacity | Unlimited (GPU) |
+| Good | + color, clip-path | 10-15 |
+| Acceptable | + width, height, margin | 5-8 |
+| Avoid | box-shadow, border-radius, filter | 1-3 |
+
+- Target 60fps (16.67ms/frame); animation logic <10ms/frame
+- will-change sparingly; keep animated elements <20 per viewport
+- Stagger reduces peak load vs simultaneous
+- Fallback: 30fps acceptable for ambient
+
+## Content Type Adaptation
+
+| Content Type | Personality | Duration | Motion Density |
+|-------------|-------------|----------|---------------|
+| Financial | Corporate/Premium | 250-500ms | Low |
+| Social media | Playful | 150-300ms | Medium |
+| Enterprise SaaS | Corporate | 200-400ms | Low |
+| Gaming | Energetic | 100-250ms | High |
+| Healthcare | Corporate/Calm | 300-600ms | Very low |
+| E-commerce | Varies | 200-400ms | Medium |
+| Editorial | Premium | 350-600ms | Low |
+| Children's apps | Playful | 150-300ms | High |
+
+## Responsive Motion
+
+| Container Width | Max Displacement | Duration |
+|----------------|-----------------|----------|
+| <400px | 20% of width | 0.8x |
+| 400-800px | 25% of width | 1.0x |
+| 800-1200px | 20% of width | 1.0x |
+| >1200px | 15% of width | 1.1x |
+
+- Small viewport: sequential, one element at a time
+- Medium: standard stagger, 2-3 columns
+- Large: full choreography, center-out stagger, parallax
+
+## Dark Mode
+- Reduce motion intensity 10-20% (bright on dark = more impact)
+- Subtler ambient motion; careful with opacity values
+- Avoid pure white flashes