diff --git a/skills/mobile-design/SKILL.md b/skills/mobile-design/SKILL.md
index 0218363b..f4109e76 100644
--- a/skills/mobile-design/SKILL.md
+++ b/skills/mobile-design/SKILL.md
@@ -1,394 +1,284 @@
 ---
 name: mobile-design
-description: Mobile-first design thinking and decision-making for iOS and Android apps. Touch interaction, performance patterns, platform conventions. Teaches principles, not fixed values. Use when building React Native, Flutter, or native mobile apps.
+description: Mobile-first design and engineering doctrine for iOS and Android apps. Covers touch interaction, performance, platform conventions, offline behavior, and mobile-specific decision-making. Teaches principles and constraints, not fixed layouts. Use for React Native, Flutter, or native mobile apps.
 allowed-tools: Read, Glob, Grep, Bash
 ---
-
 # Mobile Design System
 
+**(Mobile-First · Touch-First · Platform-Respectful)**
+
 > **Philosophy:** Touch-first. Battery-conscious. Platform-respectful. Offline-capable.
-> **Core Principle:** Mobile is NOT a small desktop. THINK mobile constraints, ASK platform choice.
+> **Core Law:** Mobile is NOT a small desktop.
+> **Operating Rule:** Think constraints first, aesthetics second.
+
+This skill exists to **prevent desktop-thinking, AI-defaults, and unsafe assumptions** when designing or building mobile applications.
 
 ---
 
-## 🔧 Runtime Scripts
+## 1. Mobile Feasibility & Risk Index (MFRI)
 
-**Execute these for validation (don't read, just run):**
+Before designing or implementing **any mobile feature or screen**, assess feasibility.
 
-| Script | Purpose | Usage |
-|--------|---------|-------|
-| `scripts/mobile_audit.py` | Mobile UX & Touch Audit | `python scripts/mobile_audit.py <project_path>` |
+### MFRI Dimensions (1–5)
+
+| Dimension                  | Question                                                          |
+| -------------------------- | ----------------------------------------------------------------- |
+| **Platform Clarity**       | Is the target platform (iOS / Android / both) explicitly defined? |
+| **Interaction Complexity** | How complex are gestures, flows, or navigation?                   |
+| **Performance Risk**       | Does this involve lists, animations, heavy state, or media?       |
+| **Offline Dependence**     | Does the feature break or degrade without network?                |
+| **Accessibility Risk**     | Does this impact motor, visual, or cognitive accessibility?       |
+
+### Score Formula
+
+```
+MFRI = (Platform Clarity + Accessibility Readiness)
+       − (Interaction Complexity + Performance Risk + Offline Dependence)
+```
+
+**Range:** `-10 → +10`
+
+### Interpretation
+
+| MFRI     | Meaning   | Required Action                       |
+| -------- | --------- | ------------------------------------- |
+| **6–10** | Safe      | Proceed normally                      |
+| **3–5**  | Moderate  | Add performance + UX validation       |
+| **0–2**  | Risky     | Simplify interactions or architecture |
+| **< 0**  | Dangerous | Redesign before implementation        |
 
 ---
 
-## 🔴 MANDATORY: Read Reference Files Before Working!
+## 2. Mandatory Thinking Before Any Work
 
-**⛔ DO NOT start development until you read the relevant files:**
+### ⛔ STOP: Ask Before Assuming (Required)
 
-### Universal (Always Read)
+If **any of the following are not explicitly stated**, you MUST ask before proceeding:
 
-| File | Content | Status |
-|------|---------|--------|
-| **[mobile-design-thinking.md](mobile-design-thinking.md)** | **⚠️ ANTI-MEMORIZATION: Forces thinking, prevents AI defaults** | **⬜ CRITICAL FIRST** |
-| **[touch-psychology.md](touch-psychology.md)** | **Fitts' Law, gestures, haptics, thumb zone** | **⬜ CRITICAL** |
-| **[mobile-performance.md](mobile-performance.md)** | **RN/Flutter performance, 60fps, memory** | **⬜ CRITICAL** |
-| **[mobile-backend.md](mobile-backend.md)** | **Push notifications, offline sync, mobile API** | **⬜ CRITICAL** |
-| **[mobile-testing.md](mobile-testing.md)** | **Testing pyramid, E2E, platform-specific** | **⬜ CRITICAL** |
-| **[mobile-debugging.md](mobile-debugging.md)** | **Native vs JS debugging, Flipper, Logcat** | **⬜ CRITICAL** |
-| [mobile-navigation.md](mobile-navigation.md) | Tab/Stack/Drawer, deep linking | ⬜ Read |
-| [mobile-typography.md](mobile-typography.md) | System fonts, Dynamic Type, a11y | ⬜ Read |
-| [mobile-color-system.md](mobile-color-system.md) | OLED, dark mode, battery-aware | ⬜ Read |
-| [decision-trees.md](decision-trees.md) | Framework/state/storage selection | ⬜ Read |
+| Aspect     | Question                                   | Why                                      |
+| ---------- | ------------------------------------------ | ---------------------------------------- |
+| Platform   | iOS, Android, or both?                     | Affects navigation, gestures, typography |
+| Framework  | React Native, Flutter, or native?          | Determines performance and patterns      |
+| Navigation | Tabs, stack, drawer?                       | Core UX architecture                     |
+| Offline    | Must it work offline?                      | Data & sync strategy                     |
+| Devices    | Phone only or tablet too?                  | Layout & density rules                   |
+| Audience   | Consumer, enterprise, accessibility needs? | Touch & readability                      |
 
-> 🧠 **mobile-design-thinking.md is PRIORITY!** This file ensures AI thinks instead of using memorized patterns.
-
-### Platform-Specific (Read Based on Target)
-
-| Platform | File | Content | When to Read |
-|----------|------|---------|--------------|
-| **iOS** | [platform-ios.md](platform-ios.md) | Human Interface Guidelines, SF Pro, SwiftUI patterns | Building for iPhone/iPad |
-| **Android** | [platform-android.md](platform-android.md) | Material Design 3, Roboto, Compose patterns | Building for Android |
-| **Cross-Platform** | Both above | Platform divergence points | React Native / Flutter |
-
-> 🔴 **If building for iOS → Read platform-ios.md FIRST!**
-> 🔴 **If building for Android → Read platform-android.md FIRST!**
-> 🔴 **If cross-platform → Read BOTH and apply conditional platform logic!**
+🚫 **Never default to your favorite stack or pattern.**
 
 ---
 
-## ⚠️ CRITICAL: ASK BEFORE ASSUMING (MANDATORY)
+## 3. Mandatory Reference Reading (Enforced)
 
-> **STOP! If the user's request is open-ended, DO NOT default to your favorites.**
+### Universal (Always Read First)
 
-### You MUST Ask If Not Specified:
+| File                          | Purpose                            | Status            |
+| ----------------------------- | ---------------------------------- | ----------------- |
+| **mobile-design-thinking.md** | Anti-memorization, context-forcing | 🔴 REQUIRED FIRST |
+| **touch-psychology.md**       | Fitts’ Law, thumb zones, gestures  | 🔴 REQUIRED       |
+| **mobile-performance.md**     | 60fps, memory, battery             | 🔴 REQUIRED       |
+| **mobile-backend.md**         | Offline sync, push, APIs           | 🔴 REQUIRED       |
+| **mobile-testing.md**         | Device & E2E testing               | 🔴 REQUIRED       |
+| **mobile-debugging.md**       | Native vs JS debugging             | 🔴 REQUIRED       |
 
-| Aspect | Ask | Why |
-|--------|-----|-----|
-| **Platform** | "iOS, Android, or both?" | Affects EVERY design decision |
-| **Framework** | "React Native, Flutter, or native?" | Determines patterns and tools |
-| **Navigation** | "Tab bar, drawer, or stack-based?" | Core UX decision |
-| **State** | "What state management? (Zustand/Redux/Riverpod/BLoC?)" | Architecture foundation |
-| **Offline** | "Does this need to work offline?" | Affects data strategy |
-| **Target devices** | "Phone only, or tablet support?" | Layout complexity |
+### Platform-Specific (Conditional)
 
-### ⛔ AI MOBILE ANTI-PATTERNS (YASAK LİSTESİ)
+| Platform       | File                |
+| -------------- | ------------------- |
+| iOS            | platform-ios.md     |
+| Android        | platform-android.md |
+| Cross-platform | BOTH above          |
 
-> 🚫 **These are AI default tendencies that MUST be avoided!**
-
-#### Performance Sins
-
-| ❌ NEVER DO | Why It's Wrong | ✅ ALWAYS DO |
-|-------------|----------------|--------------|
-| **ScrollView for long lists** | Renders ALL items, memory explodes | Use `FlatList` / `FlashList` / `ListView.builder` |
-| **Inline renderItem function** | New function every render, all items re-render | `useCallback` + `React.memo` |
-| **Missing keyExtractor** | Index-based keys cause bugs on reorder | Unique, stable ID from data |
-| **Skip getItemLayout** | Async layout = janky scroll | Provide when items have fixed height |
-| **setState() everywhere** | Unnecessary widget rebuilds | Targeted state, `const` constructors |
-| **Native driver: false** | Animations blocked by JS thread | `useNativeDriver: true` always |
-| **console.log in production** | Blocks JS thread severely | Remove before release build |
-| **Skip React.memo/const** | Every item re-renders on any change | Memoize list items ALWAYS |
-
-#### Touch/UX Sins
-
-| ❌ NEVER DO | Why It's Wrong | ✅ ALWAYS DO |
-|-------------|----------------|--------------|
-| **Touch target < 44px** | Impossible to tap accurately, frustrating | Minimum 44pt (iOS) / 48dp (Android) |
-| **Spacing < 8px between targets** | Accidental taps on neighbors | Minimum 8-12px gap |
-| **Gesture-only interactions** | Motor impaired users excluded | Always provide button alternative |
-| **No loading state** | User thinks app crashed | ALWAYS show loading feedback |
-| **No error state** | User stuck, no recovery path | Show error with retry option |
-| **No offline handling** | Crash/block when network lost | Graceful degradation, cached data |
-| **Ignore platform conventions** | Users confused, muscle memory broken | iOS feels iOS, Android feels Android |
-
-#### Security Sins
-
-| ❌ NEVER DO | Why It's Wrong | ✅ ALWAYS DO |
-|-------------|----------------|--------------|
-| **Token in AsyncStorage** | Easily accessible, stolen on rooted device | `SecureStore` / `Keychain` / `EncryptedSharedPreferences` |
-| **Hardcode API keys** | Reverse engineered from APK/IPA | Environment variables, secure storage |
-| **Skip SSL pinning** | MITM attacks possible | Pin certificates in production |
-| **Log sensitive data** | Logs can be extracted | Never log tokens, passwords, PII |
-
-#### Architecture Sins
-
-| ❌ NEVER DO | Why It's Wrong | ✅ ALWAYS DO |
-|-------------|----------------|--------------|
-| **Business logic in UI** | Untestable, unmaintainable | Service layer separation |
-| **Global state for everything** | Unnecessary re-renders, complexity | Local state default, lift when needed |
-| **Deep linking as afterthought** | Notifications, shares broken | Plan deep links from day one |
-| **Skip dispose/cleanup** | Memory leaks, zombie listeners | Clean up subscriptions, timers |
+> ❌ If you haven’t read the platform file, you are not allowed to design UI.
 
 ---
 
-## 📱 Platform Decision Matrix
+## 4. AI Mobile Anti-Patterns (Hard Bans)
 
-### When to Unify vs Diverge
+### 🚫 Performance Sins (Non-Negotiable)
 
-```
-                    UNIFY (same on both)          DIVERGE (platform-specific)
-                    ───────────────────           ──────────────────────────
-Business Logic      ✅ Always                     -
-Data Layer          ✅ Always                     -
-Core Features       ✅ Always                     -
-                    
-Navigation          -                             ✅ iOS: edge swipe, Android: back button
-Gestures            -                             ✅ Platform-native feel
-Icons               -                             ✅ SF Symbols vs Material Icons
-Date Pickers        -                             ✅ Native pickers feel right
-Modals/Sheets       -                             ✅ iOS: bottom sheet vs Android: dialog
-Typography          -                             ✅ SF Pro vs Roboto (or custom)
-Error Dialogs       -                             ✅ Platform conventions for alerts
-```
-
-### Quick Reference: Platform Defaults
-
-| Element | iOS | Android |
-|---------|-----|---------|
-| **Primary Font** | SF Pro / SF Compact | Roboto |
-| **Min Touch Target** | 44pt × 44pt | 48dp × 48dp |
-| **Back Navigation** | Edge swipe left | System back button/gesture |
-| **Bottom Tab Icons** | SF Symbols | Material Symbols |
-| **Action Sheet** | UIActionSheet from bottom | Bottom Sheet / Dialog |
-| **Progress** | Spinner | Linear progress (Material) |
-| **Pull to Refresh** | Native UIRefreshControl | SwipeRefreshLayout |
+| ❌ Never                   | Why                  | ✅ Always                                |
+| ------------------------- | -------------------- | --------------------------------------- |
+| ScrollView for long lists | Memory explosion     | FlatList / FlashList / ListView.builder |
+| Inline renderItem         | Re-renders all rows  | useCallback + memo                      |
+| Index as key              | Reorder bugs         | Stable ID                               |
+| JS-thread animations      | Jank                 | Native driver / GPU                     |
+| console.log in prod       | JS thread block      | Strip logs                              |
+| No memoization            | Battery + perf drain | React.memo / const widgets              |
 
 ---
 
-## 🧠 Mobile UX Psychology (Quick Reference)
+### 🚫 Touch & UX Sins
 
-### Fitts' Law for Touch
-
-```
-Desktop: Cursor is precise (1px)
-Mobile:  Finger is imprecise (~7mm contact area)
-
-→ Touch targets MUST be 44-48px minimum
-→ Important actions in THUMB ZONE (bottom of screen)
-→ Destructive actions AWAY from easy reach
-```
-
-### Thumb Zone (One-Handed Usage)
-
-```
-┌─────────────────────────────┐
-│      HARD TO REACH          │ ← Navigation, menu, back
-│        (stretch)            │
-├─────────────────────────────┤
-│      OK TO REACH            │ ← Secondary actions
-│       (natural)             │
-├─────────────────────────────┤
-│      EASY TO REACH          │ ← PRIMARY CTAs, tab bar
-│    (thumb's natural arc)    │ ← Main content interaction
-└─────────────────────────────┘
-        [  HOME  ]
-```
-
-### Mobile-Specific Cognitive Load
-
-| Desktop | Mobile Difference |
-|---------|-------------------|
-| Multiple windows | ONE task at a time |
-| Keyboard shortcuts | Touch gestures |
-| Hover states | NO hover (tap or nothing) |
-| Large viewport | Limited space, scroll vertical |
-| Stable attention | Interrupted constantly |
-
-For deep dive: [touch-psychology.md](touch-psychology.md)
+| ❌ Never               | Why                  | ✅ Always          |
+| --------------------- | -------------------- | ----------------- |
+| Touch <44–48px        | Miss taps            | Min touch target  |
+| Gesture-only action   | Excludes users       | Button fallback   |
+| No loading state      | Feels broken         | Explicit feedback |
+| No error recovery     | Dead end             | Retry + message   |
+| Ignore platform norms | Muscle memory broken | iOS ≠ Android     |
 
 ---
 
-## ⚡ Performance Principles (Quick Reference)
+### 🚫 Security Sins
 
-### React Native Critical Rules
+| ❌ Never                | Why                | ✅ Always               |
+| ---------------------- | ------------------ | ---------------------- |
+| Tokens in AsyncStorage | Easily stolen      | SecureStore / Keychain |
+| Hardcoded secrets      | Reverse engineered | Env + secure storage   |
+| No SSL pinning         | MITM risk          | Cert pinning           |
+| Log sensitive data     | PII leakage        | Never log secrets      |
 
-```typescript
-// ✅ CORRECT: Memoized renderItem + React.memo wrapper
-const ListItem = React.memo(({ item }: { item: Item }) => (
-  <View style={styles.item}>
-    <Text>{item.title}</Text>
-  </View>
+---
+
+## 5. Platform Unification vs Divergence Matrix
+
+```
+UNIFY                          DIVERGE
+──────────────────────────     ─────────────────────────
+Business logic                Navigation behavior
+Data models                    Gestures
+API contracts                  Icons
+Validation                     Typography
+Error semantics                Pickers / dialogs
+```
+
+### Platform Defaults
+
+| Element   | iOS          | Android        |
+| --------- | ------------ | -------------- |
+| Font      | SF Pro       | Roboto         |
+| Min touch | 44pt         | 48dp           |
+| Back      | Edge swipe   | System back    |
+| Sheets    | Bottom sheet | Dialog / sheet |
+| Icons     | SF Symbols   | Material Icons |
+
+---
+
+## 6. Mobile UX Psychology (Non-Optional)
+
+### Fitts’ Law (Touch Reality)
+
+* Finger ≠ cursor
+* Accuracy is low
+* Reach matters more than precision
+
+**Rules:**
+
+* Primary CTAs live in **thumb zone**
+* Destructive actions pushed away
+* No hover assumptions
+
+---
+
+## 7. Performance Doctrine
+
+### React Native (Required Pattern)
+
+```ts
+const Row = React.memo(({ item }) => (
+  <View><Text>{item.title}</Text></View>
 ));
 
 const renderItem = useCallback(
-  ({ item }: { item: Item }) => <ListItem item={item} />,
+  ({ item }) => <Row item={item} />,
   []
 );
 
-// ✅ CORRECT: FlatList with all optimizations
 <FlatList
   data={items}
   renderItem={renderItem}
-  keyExtractor={(item) => item.id}  // Stable ID, NOT index
-  getItemLayout={(data, index) => ({
+  keyExtractor={(i) => i.id}
+  getItemLayout={(_, i) => ({
     length: ITEM_HEIGHT,
-    offset: ITEM_HEIGHT * index,
-    index,
+    offset: ITEM_HEIGHT * i,
+    index: i,
   })}
-  removeClippedSubviews={true}
-  maxToRenderPerBatch={10}
-  windowSize={5}
 />
 ```
 
-### Flutter Critical Rules
+### Flutter (Required Pattern)
 
 ```dart
-// ✅ CORRECT: const constructors prevent rebuilds
-class MyWidget extends StatelessWidget {
-  const MyWidget({super.key}); // CONST!
+class Item extends StatelessWidget {
+  const Item({super.key});
 
   @override
   Widget build(BuildContext context) {
-    return const Column( // CONST!
-      children: [
-        Text('Static content'),
-        MyConstantWidget(),
-      ],
-    );
+    return const Text('Static');
   }
 }
-
-// ✅ CORRECT: Targeted state with ValueListenableBuilder
-ValueListenableBuilder<int>(
-  valueListenable: counter,
-  builder: (context, value, child) => Text('$value'),
-  child: const ExpensiveWidget(), // Won't rebuild!
-)
 ```
 
-### Animation Performance
-
-```
-GPU-accelerated (FAST):     CPU-bound (SLOW):
-├── transform               ├── width, height
-├── opacity                 ├── top, left, right, bottom
-└── (use these ONLY)        ├── margin, padding
-                            └── (AVOID animating these)
-```
-
-For complete guide: [mobile-performance.md](mobile-performance.md)
+* `const` everywhere possible
+* Targeted rebuilds only
 
 ---
 
-## 📝 CHECKPOINT (MANDATORY Before Any Mobile Work)
+## 8. Mandatory Mobile Checkpoint
 
-> **Before writing ANY mobile code, you MUST complete this checkpoint:**
+Before writing **any code**, you must complete this:
 
 ```
-🧠 CHECKPOINT:
+🧠 MOBILE CHECKPOINT
 
-Platform:   [ iOS / Android / Both ]
-Framework:  [ React Native / Flutter / SwiftUI / Kotlin ]
-Files Read: [ List the skill files you've read ]
+Platform:     ___________
+Framework:    ___________
+Files Read:   ___________
 
 3 Principles I Will Apply:
-1. _______________
-2. _______________
-3. _______________
+1.
+2.
+3.
 
 Anti-Patterns I Will Avoid:
-1. _______________
-2. _______________
+1.
+2.
 ```
 
-**Example:**
-```
-🧠 CHECKPOINT:
-
-Platform:   iOS + Android (Cross-platform)
-Framework:  React Native + Expo
-Files Read: touch-psychology.md, mobile-performance.md, platform-ios.md, platform-android.md
-
-3 Principles I Will Apply:
-1. FlatList with React.memo + useCallback for all lists
-2. 48px touch targets, thumb zone for primary CTAs
-3. Platform-specific navigation (edge swipe iOS, back button Android)
-
-Anti-Patterns I Will Avoid:
-1. ScrollView for lists → FlatList
-2. Inline renderItem → Memoized
-3. AsyncStorage for tokens → SecureStore
-```
-
-> 🔴 **Can't fill the checkpoint? → GO BACK AND READ THE SKILL FILES.**
+❌ Cannot complete → go back and read.
 
 ---
 
-## 🔧 Framework Decision Tree
+## 9. Framework Decision Tree (Canonical)
 
 ```
-WHAT ARE YOU BUILDING?
-        │
-        ├── Need OTA updates + rapid iteration + web team
-        │   └── ✅ React Native + Expo
-        │
-        ├── Need pixel-perfect custom UI + performance critical
-        │   └── ✅ Flutter
-        │
-        ├── Deep native features + single platform focus
-        │   ├── iOS only → SwiftUI
-        │   └── Android only → Kotlin + Jetpack Compose
-        │
-        ├── Existing RN codebase + new features
-        │   └── ✅ React Native (bare workflow)
-        │
-        └── Enterprise + existing Flutter codebase
-            └── ✅ Flutter
+Need OTA + web team → React Native + Expo
+High-perf UI → Flutter
+iOS only → SwiftUI
+Android only → Compose
 ```
 
-For complete decision trees: [decision-trees.md](decision-trees.md)
+No debate without justification.
 
 ---
 
-## 📋 Pre-Development Checklist
+## 10. Release Readiness Checklist
 
-### Before Starting ANY Mobile Project
+### Before Shipping
 
-- [ ] **Platform confirmed?** (iOS / Android / Both)
-- [ ] **Framework chosen?** (RN / Flutter / Native)
-- [ ] **Navigation pattern decided?** (Tabs / Stack / Drawer)
-- [ ] **State management selected?** (Zustand / Redux / Riverpod / BLoC)
-- [ ] **Offline requirements known?**
-- [ ] **Deep linking planned from day one?**
-- [ ] **Target devices defined?** (Phone / Tablet / Both)
-
-### Before Every Screen
-
-- [ ] **Touch targets ≥ 44-48px?**
-- [ ] **Primary CTA in thumb zone?**
-- [ ] **Loading state exists?**
-- [ ] **Error state with retry exists?**
-- [ ] **Offline handling considered?**
-- [ ] **Platform conventions followed?**
-
-### Before Release
-
-- [ ] **console.log removed?**
-- [ ] **SecureStore for sensitive data?**
-- [ ] **SSL pinning enabled?**
-- [ ] **Lists optimized (memo, keyExtractor)?**
-- [ ] **Memory cleanup on unmount?**
-- [ ] **Tested on low-end devices?**
-- [ ] **Accessibility labels on all interactive elements?**
+* [ ] Touch targets ≥ 44–48px
+* [ ] Offline handled
+* [ ] Secure storage used
+* [ ] Lists optimized
+* [ ] Logs stripped
+* [ ] Tested on low-end devices
+* [ ] Accessibility labels present
+* [ ] MFRI ≥ 3
 
 ---
 
-## 📚 Reference Files
+## 11. Related Skills
 
-For deeper guidance on specific areas:
-
-| File | When to Use |
-|------|-------------|
-| [mobile-design-thinking.md](mobile-design-thinking.md) | **FIRST! Anti-memorization, forces context-based thinking** |
-| [touch-psychology.md](touch-psychology.md) | Understanding touch interaction, Fitts' Law, gesture design |
-| [mobile-performance.md](mobile-performance.md) | Optimizing RN/Flutter, 60fps, memory/battery |
-| [platform-ios.md](platform-ios.md) | iOS-specific design, HIG compliance |
-| [platform-android.md](platform-android.md) | Android-specific design, Material Design 3 |
-| [mobile-navigation.md](mobile-navigation.md) | Navigation patterns, deep linking |
-| [mobile-typography.md](mobile-typography.md) | Type scale, system fonts, accessibility |
-| [mobile-color-system.md](mobile-color-system.md) | OLED optimization, dark mode, battery |
-| [decision-trees.md](decision-trees.md) | Framework, state, storage decisions |
+* **frontend-design** – Visual systems & components
+* **frontend-dev-guidelines** – RN/TS architecture
+* **backend-dev-guidelines** – Mobile-safe APIs
+* **error-tracking** – Crash & performance telemetry
 
 ---
 
-> **Remember:** Mobile users are impatient, interrupted, and using imprecise fingers on small screens. Design for the WORST conditions: bad network, one hand, bright sun, low battery. If it works there, it works everywhere.
+> **Final Law:**
+> Mobile users are distracted, interrupted, and impatient—often using one hand on a bad network with low battery.
+> **Design for that reality, or your app will fail quietly.**
+
+---