add frontend skills

skills/animate/SKILL.md

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+---
+name: animate
+description: Review a feature and enhance it with purposeful animations, micro-interactions, and motion effects that improve usability and delight.
+user-invokable: true
+args:
+  - name: target
+    description: The feature or component to animate (optional)
+    required: false
+---
+
+Analyze a feature and strategically add animations and micro-interactions that enhance understanding, provide feedback, and create delight.
+
+## MANDATORY PREPARATION
+
+### Context Gathering (Do This First)
+
+You cannot do a great job without having necessary context, such as target audience (critical), desired use-cases (critical), brand personality/tone (playful vs serious, energetic vs calm), and performance constraints.
+
+Attempt to gather these from the current thread or codebase.
+
+1. If you don't find *exact* information and have to infer from existing design and functionality, you MUST STOP and STOP and call the AskUserQuestionTool to clarify. whether you got it right.
+2. Otherwise, if you can't fully infer or your level of confidence is medium or lower, you MUST STOP and call the AskUserQuestionTool to clarify. clarifying questions first to complete your context.
+
+Do NOT proceed until you have answers. Guessing leads to inappropriate or excessive animation.
+
+### Use frontend-design skill
+
+Use the frontend-design skill for design principles and anti-patterns. Do NOT proceed until it has executed and you know all DO's and DON'Ts.
+
+---
+
+## Assess Animation Opportunities
+
+Analyze where motion would improve the experience:
+
+1. **Identify static areas**:
+   - **Missing feedback**: Actions without visual acknowledgment (button clicks, form submission, etc.)
+   - **Jarring transitions**: Instant state changes that feel abrupt (show/hide, page loads, route changes)
+   - **Unclear relationships**: Spatial or hierarchical relationships that aren't obvious
+   - **Lack of delight**: Functional but joyless interactions
+   - **Missed guidance**: Opportunities to direct attention or explain behavior
+
+2. **Understand the context**:
+   - What's the personality? (Playful vs serious, energetic vs calm)
+   - What's the performance budget? (Mobile-first? Complex page?)
+   - Who's the audience? (Motion-sensitive users? Power users who want speed?)
+   - What matters most? (One hero animation vs many micro-interactions?)
+
+If any of these are unclear from the codebase, STOP and call the AskUserQuestionTool to clarify.
+
+**CRITICAL**: Respect `prefers-reduced-motion`. Always provide non-animated alternatives for users who need them.
+
+## Plan Animation Strategy
+
+Create a purposeful animation plan:
+
+- **Hero moment**: What's the ONE signature animation? (Page load? Hero section? Key interaction?)
+- **Feedback layer**: Which interactions need acknowledgment?
+- **Transition layer**: Which state changes need smoothing?
+- **Delight layer**: Where can we surprise and delight?
+
+**IMPORTANT**: One well-orchestrated experience beats scattered animations everywhere. Focus on high-impact moments.
+
+## Implement Animations
+
+Add motion systematically across these categories:
+
+### Entrance Animations
+- **Page load choreography**: Stagger element reveals (100-150ms delays), fade + slide combinations
+- **Hero section**: Dramatic entrance for primary content (scale, parallax, or creative effects)
+- **Content reveals**: Scroll-triggered animations using intersection observer
+- **Modal/drawer entry**: Smooth slide + fade, backdrop fade, focus management
+
+### Micro-interactions
+- **Button feedback**:
+  - Hover: Subtle scale (1.02-1.05), color shift, shadow increase
+  - Click: Quick scale down then up (0.95 → 1), ripple effect
+  - Loading: Spinner or pulse state
+- **Form interactions**:
+  - Input focus: Border color transition, slight scale or glow
+  - Validation: Shake on error, check mark on success, smooth color transitions
+- **Toggle switches**: Smooth slide + color transition (200-300ms)
+- **Checkboxes/radio**: Check mark animation, ripple effect
+- **Like/favorite**: Scale + rotation, particle effects, color transition
+
+### State Transitions
+- **Show/hide**: Fade + slide (not instant), appropriate timing (200-300ms)
+- **Expand/collapse**: Height transition with overflow handling, icon rotation
+- **Loading states**: Skeleton screen fades, spinner animations, progress bars
+- **Success/error**: Color transitions, icon animations, gentle scale pulse
+- **Enable/disable**: Opacity transitions, cursor changes
+
+### Navigation & Flow
+- **Page transitions**: Crossfade between routes, shared element transitions
+- **Tab switching**: Slide indicator, content fade/slide
+- **Carousel/slider**: Smooth transforms, snap points, momentum
+- **Scroll effects**: Parallax layers, sticky headers with state changes, scroll progress indicators
+
+### Feedback & Guidance
+- **Hover hints**: Tooltip fade-ins, cursor changes, element highlights
+- **Drag & drop**: Lift effect (shadow + scale), drop zone highlights, smooth repositioning
+- **Copy/paste**: Brief highlight flash on paste, "copied" confirmation
+- **Focus flow**: Highlight path through form or workflow
+
+### Delight Moments
+- **Empty states**: Subtle floating animations on illustrations
+- **Completed actions**: Confetti, check mark flourish, success celebrations
+- **Easter eggs**: Hidden interactions for discovery
+- **Contextual animation**: Weather effects, time-of-day themes, seasonal touches
+
+## Technical Implementation
+
+Use appropriate techniques for each animation:
+
+### Timing & Easing
+
+**Durations by purpose:**
+- **100-150ms**: Instant feedback (button press, toggle)
+- **200-300ms**: State changes (hover, menu open)
+- **300-500ms**: Layout changes (accordion, modal)
+- **500-800ms**: Entrance animations (page load)
+
+**Easing curves (use these, not CSS defaults):**
+```css
+/* Recommended - natural deceleration */
+--ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);    /* Smooth, refined */
+--ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);   /* Slightly snappier */
+--ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);     /* Confident, decisive */
+
+/* AVOID - feel dated and tacky */
+/* bounce: cubic-bezier(0.34, 1.56, 0.64, 1); */
+/* elastic: cubic-bezier(0.68, -0.6, 0.32, 1.6); */
+```
+
+**Exit animations are faster than entrances.** Use ~75% of enter duration.
+
+### CSS Animations
+```css
+/* Prefer for simple, declarative animations */
+- transitions for state changes
+- @keyframes for complex sequences
+- transform + opacity only (GPU-accelerated)
+```
+
+### JavaScript Animation
+```javascript
+/* Use for complex, interactive animations */
+- Web Animations API for programmatic control
+- Framer Motion for React
+- GSAP for complex sequences
+```
+
+### Performance
+- **GPU acceleration**: Use `transform` and `opacity`, avoid layout properties
+- **will-change**: Add sparingly for known expensive animations
+- **Reduce paint**: Minimize repaints, use `contain` where appropriate
+- **Monitor FPS**: Ensure 60fps on target devices
+
+### Accessibility
+```css
+@media (prefers-reduced-motion: reduce) {
+  * {
+    animation-duration: 0.01ms !important;
+    animation-iteration-count: 1 !important;
+    transition-duration: 0.01ms !important;
+  }
+}
+```
+
+**NEVER**:
+- Use bounce or elastic easing curves—they feel dated and draw attention to the animation itself
+- Animate layout properties (width, height, top, left)—use transform instead
+- Use durations over 500ms for feedback—it feels laggy
+- Animate without purpose—every animation needs a reason
+- Ignore `prefers-reduced-motion`—this is an accessibility violation
+- Animate everything—animation fatigue makes interfaces feel exhausting
+- Block interaction during animations unless intentional
+
+## Verify Quality
+
+Test animations thoroughly:
+
+- **Smooth at 60fps**: No jank on target devices
+- **Feels natural**: Easing curves feel organic, not robotic
+- **Appropriate timing**: Not too fast (jarring) or too slow (laggy)
+- **Reduced motion works**: Animations disabled or simplified appropriately
+- **Doesn't block**: Users can interact during/after animations
+- **Adds value**: Makes interface clearer or more delightful
+
+Remember: Motion should enhance understanding and provide feedback, not just add decoration. Animate with purpose, respect performance constraints, and always consider accessibility. Great animation is invisible - it just makes everything feel right.