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+# Motion System v4.1
+
+Production-ready UI motion system for React / Next.js.
+
+Focused on **performance, accessibility, and usability** — not decoration.
+
+---
+
+## Core Principle
+
+Motion must:
+
+- Guide attention  
+- Communicate state  
+- Preserve spatial continuity  
+
+If it does none → remove it.
+
+---
+
+## Install
+
+```bash
+npm install motion
+```
+
+---
+
+## Version
+
+- `motion/react` → default  
+- `framer-motion` → legacy  
+
+Do not mix.
+
+---
+
+## Motion Tokens
+
+```ts
+export const motionTokens = {
+  duration: {
+    fast: 0.18,
+    normal: 0.35,
+    slow: 0.6
+  },
+  easing: {
+    smooth: [0.22, 1, 0.36, 1],
+    sharp: [0.4, 0, 0.2, 1]
+  },
+  distance: {
+    sm: 8,
+    md: 16,
+    lg: 24
+  }
+}
+```
+
+---
+
+## Performance
+
+**Safe**
+- transform
+- opacity
+
+**Avoid**
+- width / height
+- top / left
+
+Rule: responsiveness > smoothness
+
+---
+
+## Device Adaptation
+
+```ts
+const isLowEnd =
+  typeof navigator !== "undefined" &&
+  navigator.hardwareConcurrency <= 4
+
+const duration = isLowEnd ? 0.2 : 0.4
+```
+
+---
+
+## Accessibility
+
+### JS
+
+```tsx
+import { motion, useReducedMotion } from "motion/react"
+
+const reduce = useReducedMotion()
+
+<motion.div
+  initial={{ opacity: 0, y: reduce ? 0 : 24 }}
+  animate={{ opacity: 1, y: 0 }}
+/>
+```
+
+### CSS
+
+```css
+@media (prefers-reduced-motion: reduce) {
+  .motion-safe-transition {
+    transition: opacity 0.2s;
+  }
+
+  .motion-reduce-transform {
+    transform: none !important;
+  }
+}
+```
+
+### Tailwind
+
+```html
+<div class="motion-safe:animate-fade motion-reduce:opacity-100"></div>
+```
+
+---
+
+## Core Patterns
+
+### Button
+
+```tsx
+<motion.button
+  whileHover={{ scale: 1.02 }}
+  whileTap={{ scale: 0.97 }}
+/>
+```
+
+---
+
+### Stagger
+
+```ts
+const container = {
+  visible: { transition: { staggerChildren: 0.08 } }
+}
+```
+
+---
+
+### Modal Essentials
+
+- Focus trap  
+- Escape close  
+- Scroll lock  
+- ARIA roles  
+
+---
+
+## Advanced Patterns
+
+### Parallax
+
+```tsx
+const y = useTransform(scrollYProgress, [0, 1], [0, -80])
+```
+
+---
+
+### Scroll Story
+
+```tsx
+<div className="sticky top-0 h-screen" />
+```
+
+---
+
+### 3D Tilt
+
+```tsx
+<motion.div style={{ rotateX, rotateY }} />
+```
+
+---
+
+### Crossfade
+
+```tsx
+<motion.div layoutId="shared" />
+```
+
+---
+
+### Progressive Reveal
+
+```tsx
+clipPath: "inset(0 0 100% 0)"
+```
+
+---
+
+### Skeleton Loading
+
+```tsx
+<motion.div
+  className="bg-gray-200"
+  animate={{ opacity: [0.6, 1, 0.6] }}
+  transition={{ repeat: Infinity }}
+/>
+```
+
+---
+
+### Micro Interactions
+
+```tsx
+whileHover={{ scale: 1.03 }}
+whileTap={{ scale: 0.96 }}
+```
+
+---
+
+### Spring System
+
+```ts
+const spring = {
+  type: "spring",
+  stiffness: 120,
+  damping: 14
+}
+```
+
+---
+
+## Decision Tree
+
+- Hover → `whileHover`
+- Tap → `whileTap`
+- In view → `whileInView`
+- Scroll linked → `useScroll`
+- Conditional → `AnimatePresence`
+- Layout small → `layout`
+- Layout large → avoid
+- Complex → `useAnimate`
+
+---
+
+## SSR Safety
+
+- Match initial states
+- Avoid implicit animation origins
+
+---
+
+## Debugging
+
+Check:
+
+- Wrong import
+- Missing `"use client"`
+- Missing `key`
+- Hydration mismatch
+- Layout misuse
+- State-driven animation
+
+---
+
+## QA
+
+- No CLS
+- Keyboard works
+- Focus trapped
+- ARIA correct
+- Reduced motion works
+- No hydration warnings
+- Animations stop on unmount
+
+---
+
+## Anti-Patterns
+
+- Animating layout properties  
+- Infinite animations without purpose  
+- Over-staggering lists  
+- Ignoring reduced motion  
+- Using motion for decoration  
+
+---
+
+## Philosophy
+
+Motion is interaction design.
+
+---
+
+## Final Rule
+
+> If motion does not improve UX → remove it.