diff --git a/.firebaserc b/firebase/.firebaserc
similarity index 100%
rename from .firebaserc
rename to firebase/.firebaserc
diff --git a/firebase.json b/firebase/firebase.json
similarity index 100%
rename from firebase.json
rename to firebase/firebase.json
diff --git a/firestore.indexes.json b/firebase/firestore.indexes.json
similarity index 100%
rename from firestore.indexes.json
rename to firebase/firestore.indexes.json
diff --git a/firestore.rules b/firebase/firestore.rules
similarity index 100%
rename from firestore.rules
rename to firebase/firestore.rules
diff --git a/package.json b/package.json
index 963d031..b1a3b1c 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "mnswpr",
   "version": "0.0.1",
   "private": true,
-  "description": "mnswpr — the mnswpr.com web app",
+  "description": "mnswpr \u2014 the mnswpr.com web app",
   "author": "Ayo Ayco",
   "type": "module",
   "main": "main.js",
@@ -12,16 +12,16 @@
   },
   "homepage": "https://mnswpr.com",
   "scripts": {
-    "dev": "firebase emulators:exec --only firestore --ui \"node scripts/seed-dev-scores.js; vite\"",
+    "dev": "firebase --config firebase/firebase.json emulators:exec --only firestore --ui \"node scripts/seed-dev-scores.js; vite\"",
     "dev:no-db": "vite",
     "build": "vite build",
     "preview": "vite preview",
     "build:preview": "pnpm run build && pnpm run preview",
     "test": "vitest run",
     "test:watch": "vitest",
-    "deploy:db": "firebase deploy --only firestore",
+    "deploy:db": "firebase --config firebase/firebase.json deploy --only firestore",
     "deploy:site": "pnpm run build && netlify deploy --prod --dir=dist",
-    "db:start": "firebase emulators:start --only firestore",
+    "db:start": "firebase --config firebase/firebase.json emulators:start --only firestore",
     "db:seed": "FIRESTORE_EMULATOR_HOST=127.0.0.1:8080 node scripts/seed-dev-scores.js",
     "db:stop": "pkill -f '[c]loud-firestore-emulator'; pkill -f '[f]irebase.* emulators:'; true",
     "release": "pnpm lint && pnpm test && bumpp && node scripts/release.js",
diff --git a/scripts/export-legends.js b/scripts/export-legends.js
index b610ac6..7b7ff93 100644
--- a/scripts/export-legends.js
+++ b/scripts/export-legends.js
@@ -130,6 +130,6 @@ ${sections.join('\n')}
 `
 
 const __dirname = dirname(fileURLToPath(import.meta.url))
-const out = resolve(__dirname, '../legends.html')
+const out = resolve(__dirname, '../src/legends.html')
 writeFileSync(out, html)
 console.log(`\nWrote ${out}`)
diff --git a/index.html b/src/index.html
similarity index 100%
rename from index.html
rename to src/index.html
diff --git a/legends.html b/src/legends.html
similarity index 100%
rename from legends.html
rename to src/legends.html
diff --git a/main.css b/src/main.css
similarity index 100%
rename from main.css
rename to src/main.css
diff --git a/main.js b/src/main.js
similarity index 98%
rename from main.js
rename to src/main.js
index 6affb5d..b6c2364 100644
--- a/main.js
+++ b/src/main.js
@@ -3,7 +3,7 @@ import '@cozy-games/mnswpr/mnswpr.css'
 import '@cozy-games/utils/loading/loading.css'
 // The app's own version — this is what the heading shows and what the v* tags
 // and GitHub releases track. Not the engine's version (@cozy-games/mnswpr).
-import * as pkg from './package.json'
+import * as pkg from '../package.json'
 import { configureLeaderboard } from '@cozy-games/leaderboard/leaderboard-element.js'
 import { FirebaseAdapter } from '@cozy-games/leaderboard/adapters/firebase.js'
 import { NicknameService } from './modules/nickname/nickname.js'
diff --git a/modules/nickname/nickname.js b/src/modules/nickname/nickname.js
similarity index 100%
rename from modules/nickname/nickname.js
rename to src/modules/nickname/nickname.js
diff --git a/modules/user/user.js b/src/modules/user/user.js
similarity index 100%
rename from modules/user/user.js
rename to src/modules/user/user.js
diff --git a/public/favicon.ico b/src/public/favicon.ico
similarity index 100%
rename from public/favicon.ico
rename to src/public/favicon.ico
diff --git a/vite-env.d.ts b/src/vite-env.d.ts
similarity index 100%
rename from vite-env.d.ts
rename to src/vite-env.d.ts
diff --git a/vite.config.js b/vite.config.js
index aab8e2e..cb89c3d 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -1,13 +1,21 @@
 import { resolve } from 'node:path'
 import { defineConfig } from 'vite'
 
-// Multi-page build: the game (index.html) and the frozen Legends page.
+const root = resolve(import.meta.dirname, 'src')
+
+// App source lives in src/; env files and the build output stay at the repo root.
 export default defineConfig({
+  root,
+  // .env* files sit at the repo root next to package.json, not in src/.
+  envDir: import.meta.dirname,
   build: {
+    outDir: resolve(import.meta.dirname, 'dist'),
+    emptyOutDir: true,
+    // Multi-page build: the game (index.html) and the frozen Legends page.
     rollupOptions: {
       input: {
-        main: resolve(import.meta.dirname, 'index.html'),
-        legends: resolve(import.meta.dirname, 'legends.html')
+        main: resolve(root, 'index.html'),
+        legends: resolve(root, 'legends.html')
       }
     }
   }