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+# LexAI Phase 1 — Build Summary
+
+**Built by:** Forge 🔨  
+**Date:** 2026-03-06  
+**Deadline:** 3PM PH time  
+**Status:** ✅ All 7 workitems completed and pushed
+
+---
+
+## What Was Built
+
+### 1. WXT Project Setup (Issue #1) ✅
+- **Problem:** `@wxt-dev/module-react` was missing; `wxt/sandbox` import path was invalid in WXT 0.20.x
+- **Fix:** Installed `@wxt-dev/module-react`; updated imports to `wxt/utils/define-background` and `wxt/utils/define-content-script`
+- **Result:** `npm run build` completes cleanly in ~3s, output size ~166KB
+
+### 2. Text Selection Detection (Issue #2) ✅
+- Handles **three element types**:
+  - `<textarea>` and `<input>` — uses `selectionStart`/`selectionEnd` on the element
+  - `contenteditable` and regular DOM — uses the Selection/Range API
+- Captures and stores the active element + selection offsets at selection time, so replacement works even after the floating toolbar takes focus
+- 50ms debounce on `mouseup` to let the browser finalize selection
+
+### 3. Floating Toolbar UI (Issue #3) ✅
+- Polished dark toolbar with 4 actions: **✓ Fix**, **↺ Rephrase**, **↓ Shorten**, **↑ Expand**
+- Smart positioning: appears above the cursor, clamps to viewport edges, flips below if too close to top
+- Uses `data-lexai="true"` attribute on all LexAI elements to prevent self-triggering
+- Hover effects, smooth transitions, colored labels per action
+- `mousedown` preventDefault preserves the selection while clicking toolbar buttons
+- Auto-hides on: scroll, clicking elsewhere, Escape key
+
+### 4. Service Worker as LLM API Proxy (Issue #4) ✅
+- Background service worker receives `ANALYZE_TEXT` messages from content script
+- Properly uses `return true` in `onMessage` listener to keep async channel open
+- Routes to correct provider based on `chrome.storage.local` config
+- Full error handling: network errors, HTTP errors, empty responses — all surface a user-friendly message
+
+### 5. OpenAI Provider (Issue #5) ✅
+- Calls `https://api.openai.com/v1/chat/completions`
+- Strongly typed request/response with proper error extraction from OpenAI's error format
+- Default model: `gpt-4o-mini`
+- Also implemented: **Anthropic**, **Groq**, and **OpenRouter** providers (all with proper error handling)
+
+### 6. Options Page (Issue #6) ✅
+- Dark-themed, polished UI matching the toolbar aesthetic
+- Provider selector (OpenAI, Anthropic, Groq, OpenRouter)
+- Model selector (auto-populated per provider)
+- Password input with show/hide toggle
+- "Get API key →" link per provider
+- Saves to `chrome.storage.local` with visual feedback: idle → saving → saved/error
+- Enter key triggers save
+
+### 7. Result Modal with Replace Button (Issue #7) ✅
+- Full-screen dark overlay with centered modal
+- Shows the LLM suggestion in a styled code block
+- **Replace** button: calls `replaceText()` which properly handles both textarea/input and DOM selection paths
+- **Copy** button: copies to clipboard with confirmation flash
+- **Dismiss** button and overlay click to close
+- Escape key closes the modal
+- Error state shown cleanly with ❌ prefix
+
+---
+
+## Architecture
+
+```
+Content Script (content.ts)
+  ├── Detects text selection (textarea / input / contenteditable)
+  ├── Shows floating toolbar above selection
+  ├── On action click → sends ANALYZE_TEXT to service worker
+  ├── Shows loading state while waiting
+  └── Shows result modal with Replace/Copy/Dismiss
+
+Background Service Worker (background.ts)
+  ├── Listens for ANALYZE_TEXT messages
+  ├── Reads provider/apiKey/model from chrome.storage.local
+  └── Routes to OpenAI / Anthropic / Groq / OpenRouter
+
+Options Page (Options.tsx)
+  └── Saves provider/model/apiKey to chrome.storage.local
+
+Popup (Popup.tsx)
+  └── Shows current config status + link to Options
+```
+
+---
+
+## Known Issues / Caveats
+
+1. **No Tailwind CSS** — styles are all inline CSS objects. Tailwind was in devDependencies but WXT's PostCSS integration wasn't configured. Inline styles work reliably in extension content scripts (no host page CSS conflicts).
+
+2. **Shadow DOM not used** — The toolbar/modal are injected directly into `document.body`. A shadow DOM would better isolate styles but adds complexity. The `data-lexai="true"` attribute prevents self-triggering.
+
+3. **API key stored as plaintext** — TweetNaCl encryption (Issue #13) is in the backlog. For Phase 1, the key is in `chrome.storage.local` which is only accessible to the extension.
+
+4. **Content-editable replace** — Uses Range API with `range.deleteContents()` + `insertNode()`. Falls back to `execCommand('insertText')` if range throws. Works on most sites but highly customized editors (like Google Docs) may not respond correctly.
+
+5. **No streaming** — Responses are non-streaming (full response returned at once). Good enough for Phase 1; streaming UX can be a Phase 2 improvement.
+
+---
+
+## Build Output
+
+```
+.output/chrome-mv3/manifest.json               485 B
+.output/chrome-mv3/options.html                379 B
+.output/chrome-mv3/popup.html                  419 B
+.output/chrome-mv3/background.js               5 kB
+.output/chrome-mv3/chunks/client-*.js          142.52 kB
+.output/chrome-mv3/chunks/options-*.js         5.66 kB
+.output/chrome-mv3/chunks/popup-*.js           1.65 kB
+.output/chrome-mv3/content-scripts/content.js  10.38 kB
+Total: ~166 KB
+```
+
+---
+
+## Files Changed
+
+- `entrypoints/background.ts` — Complete rewrite with typed providers
+- `entrypoints/content.ts` — Complete rewrite with proper selection/toolbar/modal
+- `entrypoints/options/Options.tsx` — Complete rewrite with polished UI
+- `package.json` + `package-lock.json` — Added `@wxt-dev/module-react`