.env.example

# Firebase Configuration (Optional)
# Get these values from Firebase Console > Project Settings > Your apps > Web app
# Without these, the app works fully with localStorage only

NEXT_PUBLIC_FIREBASE_API_KEY=
NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN=
NEXT_PUBLIC_FIREBASE_PROJECT_ID=
NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET=
NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID=
NEXT_PUBLIC_FIREBASE_APP_ID=

# Google One Tap Sign-In (Optional)
# This enables the seamless Chrome sign-in prompt without popups
# Get from: Google Cloud Console > APIs & Services > Credentials > OAuth 2.0 Client IDs > Web client
# Or: Firebase Console > Authentication > Sign-in method > Google > Web SDK configuration > Web client ID
NEXT_PUBLIC_GOOGLE_CLIENT_ID=

# To enable Firebase authentication and cloud sync:
# 1. Create a Firebase project at https://console.firebase.google.com
# 2. Enable Authentication > Google sign-in provider (and Email/Password if desired)
# 3. Create a Firestore database in production mode
# 4. Add your Vercel domain to Authentication > Settings > Authorized domains
# 5. Copy the web app config values above
# 6. (Optional) Copy the Web client ID for Google One Tap sign-in