# OpenAI API Key (for GPT-4, Whisper STT, and TTS)
OPENAI_API_KEY=sk-...

# TTS Configuration (optional - defaults shown)
TTS_VOICE=alloy
# Available voices: alloy, echo, fable, onyx, nova, shimmer
TTS_MODEL=tts-1
# Available models: tts-1 (faster), tts-1-hd (higher quality)

# Server Configuration
PORT=3000
NODE_ENV=development