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+# Deep Dive Configuration
+# Copy to .env and configure with real values
+
+# =============================================================================
+# LLM Provider (for synthesis phase)
+# =============================================================================
+
+# Primary: OpenRouter (recommended - access to multiple models)
+OPENROUTER_API_KEY=sk-or-v1-...
+DEEPDIVE_LLM_PROVIDER=openrouter
+DEEPDIVE_LLM_MODEL=anthropic/claude-sonnet-4
+
+# Alternative: Anthropic direct
+# ANTHROPIC_API_KEY=sk-ant-...
+# DEEPDIVE_LLM_PROVIDER=anthropic
+# DEEPDIVE_LLM_MODEL=claude-3-5-sonnet-20241022
+
+# Alternative: OpenAI
+# OPENAI_API_KEY=sk-...
+# DEEPDIVE_LLM_PROVIDER=openai
+# DEEPDIVE_LLM_MODEL=gpt-4o
+
+# =============================================================================
+# Text-to-Speech Provider
+# =============================================================================
+
+# Primary: Piper (local, open-source, default for sovereignty)
+DEEPDIVE_TTS_PROVIDER=piper
+PIPER_MODEL_PATH=/opt/piper/models/en_US-lessac-medium.onnx
+PIPER_CONFIG_PATH=/opt/piper/models/en_US-lessac-medium.onnx.json
+
+# Alternative: ElevenLabs (cloud, higher quality)
+# DEEPDIVE_TTS_PROVIDER=elevenlabs
+# ELEVENLABS_API_KEY=sk_...
+# ELEVENLABS_VOICE_ID=...
+
+# Alternative: Coqui TTS (local)
+# DEEPDIVE_TTS_PROVIDER=coqui
+# COQUI_MODEL_NAME=tacotron2
+
+# =============================================================================
+# Telegram Delivery
+# =============================================================================
+
+TELEGRAM_BOT_TOKEN=123456789:ABCdefGHIjklMNOpqrsTUVwxyz
+TELEGRAM_CHAT_ID=12345678
+
+# =============================================================================
+# Scheduling
+# =============================================================================
+
+DEEPDIVE_SCHEDULE=06:00
+DEEPDIVE_TIMEZONE=America/New_York
+
+# =============================================================================
+# Paths (adjust for your installation)
+# =============================================================================
+
+DEEPDIVE_DATA_DIR=/opt/deepdive/data
+DEEPDIVE_CONFIG_DIR=/opt/deepdive/config
+DEEPDIVE_LOG_DIR=/opt/deepdive/logs
+
+# Optional: Semantic Scholar API (for enhanced metadata)
+# SEMANTIC_SCHOLAR_API_KEY=...