diff --git a/.gitignore b/.gitignore
index c2bbafe..3e1a758 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ node_modules/
 .wxt/
 dist/
 *.local
+*.zip
diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 0000000..2bd5a0a
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+22
diff --git a/README.md b/README.md
index d9bbe28..73cbb12 100644
--- a/README.md
+++ b/README.md
@@ -18,9 +18,8 @@ A Grammarly-like Chrome Extension powered by **your own LLM API key**. No monthl
 
 ## Tech Stack
 - WXT + React 18 + TypeScript
-- Tailwind CSS
-- Zustand (state)
 - Manifest V3
+- Inline-styled UI (no CSS framework)
 
 ## Development
 
diff --git a/entrypoints/options/Options.tsx b/entrypoints/options/Options.tsx
index e607c01..69db6ff 100644
--- a/entrypoints/options/Options.tsx
+++ b/entrypoints/options/Options.tsx
@@ -498,7 +498,7 @@ function OptionsPage() {
           <strong style={{ color: '#a6adc8' }}>How to use LexAI:</strong>
           <ol style={{ margin: '8px 0 0 16px', padding: 0 }}>
             <li>Select any text on a webpage</li>
-            <li>Click Fix, Rephrase, Shorten, Expand, or Tone</li>
+            <li>Click Fix, Rephrase, Shorten, Expand, or Explain</li>
             <li>Accept or replace the suggestion</li>
           </ol>
         </div>
diff --git a/package-lock.json b/package-lock.json
index bf50bc3..7e8e4a0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,29 +1,25 @@
 {
   "name": "lexai",
-  "version": "0.1.0",
+  "version": "1.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "lexai",
-      "version": "0.1.0",
+      "version": "1.0.0",
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-        "tweetnacl-util": "^0.15.1",
-        "wxt": "^0.20.18",
-        "zustand": "^5.0.3"
+        "wxt": "^0.20.18"
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-      "devOptional": true,
+      "dev": true,
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-      "devOptional": true,
+      "dev": true,
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@@ -2038,34 +2021,6 @@
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-        },
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-      "dev": true,
-      "license": "MIT",
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@@ -2460,16 +2365,6 @@
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-      "license": "MIT",
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@@ -2918,19 +2813,6 @@
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-          "url": "https://opencollective.com/postcss/"
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-      "peerDependencies": {
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-      "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.1.2.tgz",
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
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-        "util-deprecate": "^1.0.2"
-      },
-      "engines": {
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-    },
-    "node_modules/postcss-value-parser": {
-      "version": "4.2.0",
-      "resolved": "https://registry.npmjs.org/postcss-value-parser/-/postcss-value-parser-4.2.0.tgz",
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-      "dev": true,
-      "license": "MIT"
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@@ -5666,16 +5262,6 @@
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       }
     },
-    "node_modules/read-cache": {
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-      "resolved": "https://registry.npmjs.org/read-cache/-/read-cache-1.0.0.tgz",
-      "integrity": "sha512-Owdv/Ft7IjOgm/i0xvNDZ1LrRANRfew4b2prF3OWMQLxLfu3bS8FVhCsrSCMK4lR56Y9ya+AThoTpDCTxCmpRA==",
-      "dev": true,
-      "license": "MIT",
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       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.8.tgz",
@@ -5765,27 +5351,6 @@
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       }
     },
-    "node_modules/resolve": {
-      "version": "1.22.11",
-      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.11.tgz",
-      "integrity": "sha512-RfqAvLnMl313r7c9oclB1HhUEAezcpLjz95wFH4LVuhk9JF/r22qmVP9AMmOU4vMX7Q8pN8jwNg/CSpdFnMjTQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "is-core-module": "^2.16.1",
-        "path-parse": "^1.0.7",
-        "supports-preserve-symlinks-flag": "^1.0.0"
-      },
-      "bin": {
-        "resolve": "bin/resolve"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/restore-cursor": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-5.1.0.tgz",
@@ -6253,59 +5818,6 @@
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       "license": "MIT"
     },
-    "node_modules/sucrase": {
-      "version": "3.35.1",
-      "resolved": "https://registry.npmjs.org/sucrase/-/sucrase-3.35.1.tgz",
-      "integrity": "sha512-DhuTmvZWux4H1UOnWMB3sk0sbaCVOoQZjv8u1rDoTV0HTdGem9hkAZtl4JZy8P2z4Bg0nT+YMeOFyVr4zcG5Tw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@jridgewell/gen-mapping": "^0.3.2",
-        "commander": "^4.0.0",
-        "lines-and-columns": "^1.1.6",
-        "mz": "^2.7.0",
-        "pirates": "^4.0.1",
-        "tinyglobby": "^0.2.11",
-        "ts-interface-checker": "^0.1.9"
-      },
-      "bin": {
-        "sucrase": "bin/sucrase",
-        "sucrase-node": "bin/sucrase-node"
-      },
-      "engines": {
-        "node": ">=16 || 14 >=14.17"
-      }
-    },
-    "node_modules/sucrase/node_modules/commander": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-4.1.1.tgz",
-      "integrity": "sha512-NOKm8xhkzAjzFx8B2v5OAHT+u5pRQc2UCa2Vq9jYL/31o2wi9mxBA7LIFs3sV5VSC49z6pEhfbMULvShKj26WA==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 6"
-      }
-    },
-    "node_modules/sucrase/node_modules/lines-and-columns": {
-      "version": "1.2.4",
-      "resolved": "https://registry.npmjs.org/lines-and-columns/-/lines-and-columns-1.2.4.tgz",
-      "integrity": "sha512-7ylylesZQ/PV29jhEDl3Ufjo6ZX7gCqJr5F7PKrqc93v7fzSymt1BpwEU8nAUXs8qzzvqhbjhK5QZg6Mt/HkBg==",
-      "dev": true,
-      "license": "MIT"
-    },
-    "node_modules/supports-preserve-symlinks-flag": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
-      "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/symbol-tree": {
       "version": "3.2.4",
       "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
@@ -6313,141 +5825,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/tailwindcss": {
-      "version": "3.4.19",
-      "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-3.4.19.tgz",
-      "integrity": "sha512-3ofp+LL8E+pK/JuPLPggVAIaEuhvIz4qNcf3nA1Xn2o/7fb7s/TYpHhwGDv1ZU3PkBluUVaF8PyCHcm48cKLWQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@alloc/quick-lru": "^5.2.0",
-        "arg": "^5.0.2",
-        "chokidar": "^3.6.0",
-        "didyoumean": "^1.2.2",
-        "dlv": "^1.1.3",
-        "fast-glob": "^3.3.2",
-        "glob-parent": "^6.0.2",
-        "is-glob": "^4.0.3",
-        "jiti": "^1.21.7",
-        "lilconfig": "^3.1.3",
-        "micromatch": "^4.0.8",
-        "normalize-path": "^3.0.0",
-        "object-hash": "^3.0.0",
-        "picocolors": "^1.1.1",
-        "postcss": "^8.4.47",
-        "postcss-import": "^15.1.0",
-        "postcss-js": "^4.0.1",
-        "postcss-load-config": "^4.0.2 || ^5.0 || ^6.0",
-        "postcss-nested": "^6.2.0",
-        "postcss-selector-parser": "^6.1.2",
-        "resolve": "^1.22.8",
-        "sucrase": "^3.35.0"
-      },
-      "bin": {
-        "tailwind": "lib/cli.js",
-        "tailwindcss": "lib/cli.js"
-      },
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-      "dev": true,
-      "license": "MIT",
-      "bin": {
-        "jiti": "bin/jiti.js"
-      }
-    },
-    "node_modules/tailwindcss/node_modules/readdirp": {
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "picomatch": "^2.2.1"
-      },
-      "engines": {
-        "node": ">=8.10.0"
-      }
-    },
-    "node_modules/thenify": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.1.tgz",
-      "integrity": "sha512-RVZSIV5IG10Hk3enotrhvz0T9em6cyHBLkH/YAZuKqd8hRkKhSfCGIcP2KUY0EPxndzANBmNllzWPwak+bheSw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "any-promise": "^1.0.0"
-      }
-    },
-    "node_modules/thenify-all": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/thenify-all/-/thenify-all-1.6.0.tgz",
-      "integrity": "sha512-RNxQH/qI8/t3thXJDwcstUO4zeqo64+Uy/+sNVRBx4Xn2OX+OZ9oP+iJnNFqplFra2ZUVeKCSa2oVWi3T4uVmA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "thenify": ">= 3.1.0 < 4"
-      },
-      "engines": {
-        "node": ">=0.8"
-      }
-    },
     "node_modules/thread-stream": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/thread-stream/-/thread-stream-3.1.0.tgz",
@@ -6621,13 +5998,6 @@
         "node": ">=20"
       }
     },
-    "node_modules/ts-interface-checker": {
-      "version": "0.1.13",
-      "resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
-      "integrity": "sha512-Y/arvbn+rrz3JCKl9C4kVNfTfSm2/mEp5FSz5EsZSANGPSlQrpRI5M4PKF+mJnE52jOO90PnPSc3Ur3bTQw0gA==",
-      "dev": true,
-      "license": "Apache-2.0"
-    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@@ -6640,12 +6010,6 @@
       "integrity": "sha512-6rt+RN7aOi1nGMyC4Xa5DdYiukl2UWCbcJft7YhxReBGQD7OAM8Pbxw6YMo4r2diNEA8FEmu32YOn9rhaiE5yw==",
       "license": "Unlicense"
     },
-    "node_modules/tweetnacl-util": {
-      "version": "0.15.1",
-      "resolved": "https://registry.npmjs.org/tweetnacl-util/-/tweetnacl-util-0.15.1.tgz",
-      "integrity": "sha512-RKJBIj8lySrShN4w6i/BonWp2Z/uxwC3h4y7xsRrpP59ZboCd0GpEVsOnMDYLMmKBpYhb5TgHzZXy7wTfYFBRw==",
-      "license": "Unlicense"
-    },
     "node_modules/type-fest": {
       "version": "3.13.1",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-3.13.1.tgz",
@@ -7595,35 +6959,6 @@
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
-    },
-    "node_modules/zustand": {
-      "version": "5.0.11",
-      "resolved": "https://registry.npmjs.org/zustand/-/zustand-5.0.11.tgz",
-      "integrity": "sha512-fdZY+dk7zn/vbWNCYmzZULHRrss0jx5pPFiOuMZ/5HJN6Yv3u+1Wswy/4MpZEkEGhtNH+pwxZB8OKgUBPzYAGg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=12.20.0"
-      },
-      "peerDependencies": {
-        "@types/react": ">=18.0.0",
-        "immer": ">=9.0.6",
-        "react": ">=18.0.0",
-        "use-sync-external-store": ">=1.2.0"
-      },
-      "peerDependenciesMeta": {
-        "@types/react": {
-          "optional": true
-        },
-        "immer": {
-          "optional": true
-        },
-        "react": {
-          "optional": true
-        },
-        "use-sync-external-store": {
-          "optional": true
-        }
-      }
     }
   }
 }
diff --git a/package.json b/package.json
index d0256ab..ab901f0 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,10 @@
   "name": "lexai",
   "version": "1.0.0",
   "description": "A Grammarly-like Chrome Extension powered by your own LLM provider and API key",
+  "engines": {
+    "node": ">=22"
+  },
+  "packageManager": "npm@11.13.0",
   "scripts": {
     "dev": "wxt",
     "build": "wxt build",
@@ -15,18 +19,14 @@
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "tweetnacl": "^1.0.3",
-    "tweetnacl-util": "^0.15.1",
-    "wxt": "^0.20.18",
-    "zustand": "^5.0.3"
+    "wxt": "^0.20.18"
   },
   "devDependencies": {
     "@playwright/test": "^1.50.1",
     "@types/chrome": "^0.1.37",
     "@types/react": "^18.3.1",
     "@types/react-dom": "^18.3.1",
-    "autoprefixer": "^10.4.20",
     "jsdom": "^28.1.0",
-    "tailwindcss": "^3.4.17",
     "typescript": "^5.7.3",
     "vitest": "^3.0.7"
   }
diff --git a/tests/e2e/extension.test.ts b/tests/e2e/extension.test.ts
index 911e8e7..28acb06 100644
--- a/tests/e2e/extension.test.ts
+++ b/tests/e2e/extension.test.ts
@@ -1,6 +1,9 @@
 import { test, expect } from '@playwright/test';
 
-test('LexAI popup opens correctly', async ({ page }) => {
+// TODO(P6-T1): these specs hard-code a literal [EXTENSION_ID] placeholder and can
+// never pass. Skipped until a Playwright global-setup resolves the real extension
+// ID from the loaded unpacked build's service-worker URL.
+test.skip('LexAI popup opens correctly', async ({ page }) => {
   // Navigate to extension popup
   await page.goto('chrome-extension://[EXTENSION_ID]/popup/index.html');
 
@@ -11,7 +14,7 @@ test('LexAI popup opens correctly', async ({ page }) => {
   await expect(page.locator('button:has-text("Open Settings")')).toBeVisible();
 });
 
-test('Options page saves API key', async ({ page }) => {
+test.skip('Options page saves API key', async ({ page }) => {
   await page.goto('chrome-extension://[EXTENSION_ID]/options/index.html');
 
   // Fill in API key
diff --git a/tsconfig.json b/tsconfig.json
index 599147f..332b67d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,6 +10,7 @@
     "skipLibCheck": true,
     "types": ["chrome"],
     "esModuleInterop": true,
+    "resolveJsonModule": true,
     "allowImportingTsExtensions": true,
     "paths": {
       "~/*": ["./src/*"]
diff --git a/wxt.config.ts b/wxt.config.ts
index 8639e3f..8038b04 100644
--- a/wxt.config.ts
+++ b/wxt.config.ts
@@ -1,4 +1,5 @@
 import { defineConfig } from 'wxt';
+import pkg from './package.json';
 
 export default defineConfig({
   extensionApi: 'chrome',
@@ -6,7 +7,9 @@ export default defineConfig({
   manifest: {
     name: 'LexAI - AI Writing Assistant',
     description: 'Grammar checking and writing assistance powered by your own LLM API key',
-    version: '1.0.0',
+    // Single source of truth: manifest version always follows package.json,
+    // so a release bump is a one-file edit and versions can never drift.
+    version: pkg.version,
     icons: {
       '16': 'icon-16.png',
       '32': 'icon-32.png',