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+# CV Project - Developer Memory
+
+## ⚠️ CRITICAL: Read This Before Any Changes
+
+This document contains **non-negotiable rules** and **hard-learned lessons** from this project's development. Violating these causes bugs, breaks features, and wastes time.
+
+---
+
+## 🔴 ABSOLUTE RULES - NEVER VIOLATE
+
+### 1. Icon Naming Convention (CRITICAL)
+
+**ALWAYS use "icons" - NEVER "logos"**
+
+```javascript
+// ✅ CORRECT
+.show-icons
+localStorage.getItem('cv-icons')
+const showIcons = ...
+
+// ❌ WRONG - WILL BREAK ICON TOGGLE
+.show-logos
+localStorage.getItem('cv-logos')
+const showLogos = ...
+```
+
+**Why:** Icon toggle had critical bug (commit 3f77fed) because JavaScript used `.show-logos` but CSS checked for `.show-icons`. This caused toggles to only work after page refresh.
+
+**Test that enforces this:** `tests/mjs/1-toggles.test.mjs`
+
+**Memory file:** `~/.claude/cv-icons-migration.md`
+
+---
+
+### 2. Hyperscript Parser Limit (CRITICAL)
+
+**Maximum 3 `def` statements total across ALL files**
+
+Hyperscript 0.9.14 has a hard parser limit:
+- ✅ Max 3 `def` statements across entire application
+- ✅ Count includes ALL `<script type="_hyperscript">` blocks
+- ✅ Count includes ALL inline `_="def ..."` attributes
+
+**Solution:** Move complex logic to JavaScript functions
+
+```javascript
+// ✅ CORRECT - JavaScript functions
+function toggleIcons(showIcons) { ... }
+function toggleCVLength(isLong) { ... }
+function toggleTheme(isClean) { ... }
+
+// Call from hyperscript
+_="on change call toggleIcons(my.checked)"
+
+// ❌ WRONG - Too many def statements
+_="def toggleIcons(show)
+     if show then add .show-icons...
+   end"
+```
+
+**Why:** Parser crashes/fails silently when limit exceeded.
+
+**Test that enforces this:** `tests/mjs/3-hyperscript.test.mjs`
+
+**Reference:** `HYPERSCRIPT-RULES.md`
+
+---
+
+### 3. Toggle Synchronization (CRITICAL)
+
+**Action bar and menu toggles MUST stay synchronized**
+
+Every toggle exists in TWO places:
+1. Action bar (desktop) - `#lengthToggle`, `#iconToggle`, `#themeToggle`
+2. Hamburger menu (mobile) - `#lengthToggleMenu`, `#iconToggleMenu`, `#themeToggleMenu`
+
+**Required behavior:**
+- ✅ Clicking either toggle updates BOTH
+- ✅ Changes are real-time (no page refresh)
+- ✅ localStorage persists the state
+- ✅ Page load reads from localStorage and applies to both
+
+```javascript
+// ✅ CORRECT - Update both toggles
+function toggleIcons(showIcons) {
+  const paper = document.querySelector('.cv-paper');
+  const otherToggle = document.querySelector('#iconToggle') ||
+                      document.querySelector('#iconToggleMenu');
+
+  if (showIcons) {
+    paper?.classList.add('show-icons');
+    localStorage.setItem('cv-icons', 'true');
+    if (otherToggle) otherToggle.checked = true;
+  } else {
+    paper?.classList.remove('show-icons');
+    localStorage.setItem('cv-icons', 'false');
+    if (otherToggle) otherToggle.checked = false;
+  }
+}
+```
+
+**Test that enforces this:** `tests/mjs/1-toggles.test.mjs`
+
+---
+
+### 4. Real-Time Rendering (CRITICAL)
+
+**ALL UI changes MUST happen without page refresh**
+
+```javascript
+// ✅ CORRECT - Immediate DOM update
+paper.classList.add('show-icons');  // CSS change happens instantly
+
+// ❌ WRONG - Requires refresh
+localStorage.setItem('cv-icons', 'true');  // Only storage, no visual change
+```
+
+**Why:** Users expect instant feedback. Any delay or refresh requirement feels broken.
+
+**Test that enforces this:** `tests/mjs/1-toggles.test.mjs` (with screenshot verification)
+
+---
+
+### 5. Test Suite as Single Source of Truth
+
+**If a test passes, the feature MUST work. If a feature works, the test MUST pass.**
+
+```
+tests/mjs/
+├── 0-zoom.test.mjs              # Zoom functionality
+├── 1-toggles.test.mjs           # ALL toggles + sync + persistence
+├── 2-keyboard-shortcuts.test.mjs # L, I, V, ? keys
+├── 3-hyperscript.test.mjs       # Parse errors + def limit
+├── 4-htmx.test.mjs              # HTMX integration
+├── 5-language.test.mjs          # EN/ES switching
+├── 6-modals.test.mjs            # Modal functionality
+└── 7-mobile-responsive.test.mjs # Mobile viewports
+```
+
+**Non-negotiable:**
+- ❌ NO code changes without test validation
+- ❌ NO bug fixes without regression test
+- ❌ NO features without test coverage
+- ❌ NO deployment if tests fail
+
+**Run before every commit:**
+```bash
+bun tests/run-all.mjs
+```
+
+**Reference:** `tests/README.md`, `tests/TEST-SUMMARY.md`
+
+---
+
+## 📋 Architecture Decisions
+
+### Tech Stack
+
+**Runtime & Framework:**
+- ✅ Bun (JavaScript runtime)
+- ✅ Hono (Web framework)
+- ✅ HTMX (Hypermedia)
+- ✅ Hyperscript 0.9.14 (Event handling - LIMITED USE)
+
+**Why HTMX + Hyperscript:**
+- Server-driven UI (hypermedia pattern)
+- Minimal JavaScript
+- Progressive enhancement
+- Real-time updates via SSE
+
+**Why Bun:**
+- Fast runtime
+- Built-in TypeScript
+- Native test runner
+- Single tool for everything
+
+### File Organization
+
+```
+cv/
+├── server.ts                    # Hono server
+├── static/
+│   ├── js/
+│   │   └── cv-functions.js     # Global functions (toggles, keyboard shortcuts)
+│   └── css/
+│       └── styles.css
+├── templates/
+│   ├── index.html              # Main template
+│   └── partials/
+│       └── navigation/
+│           ├── view-controls.html    # Action bar toggles
+│           └── hamburger-menu.html   # Mobile menu
+└── tests/
+    └── mjs/                     # Systematic test suite
+```
+
+**Critical files:**
+- `static/js/cv-functions.js` - All global toggle/keyboard functions
+- `templates/partials/navigation/view-controls.html` - Action bar toggles
+- `templates/partials/navigation/hamburger-menu.html` - Mobile menu toggles
+
+---
+
+## 🐛 Historical Bugs (Learn From These)
+
+### Bug 1: Icon Toggle Required Refresh
+**Commit:** 3f77fed
+**Date:** 2025-11-17
+**Symptom:** Icon toggle only worked after page refresh
+**Root cause:** Class name mismatch
+- JavaScript: `classList.add('show-logos')`
+- CSS: `.cv-paper:not(.show-icons)`
+**Fix:** Changed all references from "logos" to "icons"
+**Test added:** Screenshot verification in `1-toggles.test.mjs`
+**Memory:** `~/.claude/cv-icons-migration.md`
+
+### Bug 2: Hyperscript Parser Crash
+**Date:** 2025-11-16
+**Symptom:** Silent failures, toggles stopped working
+**Root cause:** Exceeded 3 `def` statement limit
+**Fix:** Moved toggle logic to JavaScript (`cv-functions.js`)
+**Test added:** Def statement counter in `3-hyperscript.test.mjs`
+**Reference:** `HYPERSCRIPT-RULES.md`
+
+### Bug 3: Toggle Desynchronization
+**Date:** 2025-11-15
+**Symptom:** Action bar and menu toggles out of sync
+**Root cause:** Only updating one toggle, not both
+**Fix:** Every toggle function now updates both locations
+**Test added:** Sync verification in `1-toggles.test.mjs`
+
+---
+
+## 🎯 Development Workflow
+
+### Before Making Changes
+
+1. **Read relevant test:** Understand what's being tested
+2. **Run the test:** See current behavior
+3. **Make changes:** Code + test updates together
+4. **Run test again:** Verify it passes
+5. **Run ALL tests:** `bun tests/run-all.mjs`
+6. **Manual verification:** Browser stays open - check it yourself
+7. **Commit:** With clear description
+
+### When Adding a Feature
+
+1. **Write test FIRST** (test what you want to build)
+2. **Implement feature**
+3. **Test passes** (feature works)
+4. **Update documentation** (TEST-SUMMARY.md)
+5. **Commit both** (code + test together)
+
+### When Fixing a Bug
+
+1. **Write regression test** (reproduces the bug)
+2. **Test FAILS** (proves bug exists)
+3. **Fix the bug**
+4. **Test PASSES** (proves fix works)
+5. **Commit both** (fix + test together)
+
+---
+
+## 📝 Key Patterns
+
+### Toggle Pattern (Standard)
+
+```javascript
+function toggleX(enabled) {
+  const target = document.querySelector('.target');
+  const otherToggle = document.querySelector('#xToggle') ||
+                      document.querySelector('#xToggleMenu');
+
+  if (enabled) {
+    target?.classList.add('state-class');
+    localStorage.setItem('cv-x', 'true');
+    if (otherToggle) otherToggle.checked = true;
+  } else {
+    target?.classList.remove('state-class');
+    localStorage.setItem('cv-x', 'false');
+    if (otherToggle) otherToggle.checked = false;
+  }
+}
+```
+
+**Must have:**
+- ✅ Real-time DOM update
+- ✅ localStorage persistence
+- ✅ Sync both toggle locations
+- ✅ Safe navigation (`?.`)
+
+### Hyperscript Pattern (LIMITED USE)
+
+```html
+<!-- ✅ GOOD - Simple event delegation -->
+<button _="on click call myJavaScriptFunction(my.checked)">
+
+<!-- ⚠️ AVOID - Complex logic (use JS instead) -->
+<button _="on click
+             if condition then ...
+             else ... end">
+
+<!-- ❌ FORBIDDEN - def statements (unless absolutely necessary) -->
+<script type="_hyperscript">
+  def myFunction()  <!-- COUNTS TOWARD 3 LIMIT -->
+    ...
+  end
+</script>
+```
+
+### Keyboard Shortcuts Pattern
+
+```javascript
+document.addEventListener('keydown', (e) => {
+  // ✅ ALWAYS check for input fields
+  if (e.target.matches('input, textarea, select')) return;
+
+  // ✅ Use lowercase key
+  const key = e.key.toLowerCase();
+
+  switch(key) {
+    case 'l': toggleCVLength(!body.classList.contains('cv-long')); break;
+    case 'i': toggleIcons(!paper.classList.contains('show-icons')); break;
+    case 'v': toggleTheme(!body.classList.contains('theme-clean')); break;
+    case '?': document.querySelector('#shortcuts-modal')?.showModal(); break;
+  }
+});
+```
+
+**Test:** `tests/mjs/2-keyboard-shortcuts.test.mjs`
+
+---
+
+## 🔧 Common Operations
+
+### Adding a New Toggle
+
+1. **Add to HTML:** Action bar + menu
+2. **Add localStorage key:** Choose naming convention
+3. **Add toggle function:** Follow standard pattern
+4. **Add keyboard shortcut:** Optional but recommended
+5. **Add to test:** Update `1-toggles.test.mjs`
+6. **Add to keyboard test:** If you added shortcut
+7. **Run ALL tests**
+
+### Changing Class Names
+
+1. **Search globally:** Find ALL references
+2. **Update JavaScript:** cv-functions.js
+3. **Update CSS:** All stylesheets
+4. **Update HTML:** All templates
+5. **Update tests:** Search for old name
+6. **Create memory file:** `~/.claude/name-migration.md`
+7. **Test thoroughly**
+
+### Debugging Toggle Issues
+
+**Checklist:**
+- [ ] Check class name matches between JS and CSS
+- [ ] Verify both toggles are updated (action bar + menu)
+- [ ] Check localStorage key is correct
+- [ ] Verify real-time DOM update happens
+- [ ] Run `1-toggles.test.mjs` - does it catch the bug?
+- [ ] If test doesn't catch it, FIX THE TEST FIRST
+
+---
+
+## 📚 Key Documents
+
+### Must Read Before Changes
+- `tests/README.md` - Test suite accountability
+- `HYPERSCRIPT-RULES.md` - Parser limits and workarounds
+- `~/.claude/cv-icons-migration.md` - Icon naming convention
+
+### Reference Documentation
+- `tests/TEST-SUMMARY.md` - Complete test documentation
+- `tests/mjs/README.md` - Test structure and patterns
+- `MODERN-WEB-TECHNIQUES.md` - Architecture decisions
+
+### Historical Record
+- `tests/archive/README.md` - Legacy tests (reference only)
+- Git history - Search for bug fix commits
+
+---
+
+## 🎓 Lessons Learned
+
+### 1. Name Things Correctly From the Start
+**Lesson:** Renaming "logos" to "icons" required:
+- Updating 4 files
+- Creating memory document
+- Adding test verification
+- Could have been avoided with better initial naming
+
+**Rule:** Think about naming conventions BEFORE first implementation
+
+### 2. Tests Are Not Optional
+**Lesson:** Icon toggle bug existed for days before we added screenshot verification to the test. The test was passing but the feature was broken.
+
+**Rule:** Tests must verify ACTUAL behavior, not just code execution
+
+### 3. Framework Limits Are Real
+**Lesson:** Hyperscript's 3 `def` limit seems arbitrary but it's a hard constraint. We learned this after hitting silent failures.
+
+**Rule:** Read framework documentation carefully, especially limits/constraints
+
+### 4. Synchronization Is Hard
+**Lesson:** Having toggles in two places (action bar + menu) means every change must update both. Forgetting this causes desync bugs.
+
+**Rule:** If something appears in multiple places, use a single function to update ALL locations
+
+### 5. Real-Time Updates Are Expected
+**Lesson:** Users don't understand localStorage vs DOM updates. If they click a button, they expect INSTANT visual feedback.
+
+**Rule:** Every toggle must update both localStorage AND DOM immediately
+
+---
+
+## 🚀 Future Developers
+
+**Before you change ANYTHING:**
+
+1. Read this document
+2. Read `tests/README.md`
+3. Run `bun tests/run-all.mjs`
+4. Understand which test covers what you're changing
+5. Make your changes + update tests together
+6. Run ALL tests again
+7. Manual verification in browser
+8. Update this document if you learn something new
+
+**When you hit a bug:**
+
+1. Which test should have caught this?
+2. Why didn't it?
+3. Fix the test FIRST
+4. Then fix the bug
+5. Document the lesson in this file
+
+**Remember:**
+- Tests are the specification
+- If tests pass but feature fails → tests are wrong
+- If feature works but tests fail → feature is wrong
+- When in doubt, trust the tests MORE than the code
+
+---
+
+**Last Updated:** 2025-11-17
+**Project Status:** Production
+**Test Coverage:** 8 systematic tests, 100% core features
+**Critical Memory Files:** This file + `~/.claude/cv-icons-migration.md`