polish: voice locks + Tailwind 4 migration

app/globals.css

@@ -1,3 +1 @@
-@tailwind base;
-@tailwind components;
-@tailwind utilities;
+@import "tailwindcss";

app/page.tsx

@@ -4,9 +4,9 @@ export default function Page() {
   return (
     <main className="mx-auto max-w-2xl px-6 py-16">
       <div className="text-xs uppercase tracking-wider text-neutral-500">Etymolt · Next.js example</div>
-      <h1 className="mt-2 text-3xl font-semibold tracking-tight">Check a brand name.</h1>
+      <h1 className="mt-2 text-3xl font-semibold tracking-tight">Naming, attested.</h1>
       <p className="mt-3 text-neutral-600">
-        Type a candidate name. Etymolt returns a signed verdict across five axes: trademark, domain, cultural signal, sound, pronunciation.
+        The fact-check layer for LLM-generated names. Type a candidate. Etymolt returns a signed verdict across five axes: trademark, domain, cultural signal, sound, pronunciation.
       </p>
       <div className="mt-8">
         <VerifyForm />

package.json

@@ -21,6 +21,6 @@
     "typescript": "^5.5.0",
     "tailwindcss": "^4.0.0",
     "postcss": "^8.4.0",
-    "autoprefixer": "^10.4.0"
+    "@tailwindcss/postcss": "^4.0.0"
   }
 }

postcss.config.mjs

@@ -1 +1,5 @@
-export default { plugins: { tailwindcss: {}, autoprefixer: {} } };
+export default {
+  plugins: {
+    "@tailwindcss/postcss": {},
+  },
+};