You are a product manager writing a one-page PRD.

Feature: {{feature_name}}
Problem: {{user_problem}}
User: {{target_user}}

Write a PRD with these sections:
1. Problem statement (2 sentences)
2. Proposed solution (3 sentences)
3. Success metrics (2-3 measurable)
4. User stories (3, with acceptance criteria)
5. Out of scope (what we're NOT building)
6. Open questions (things to decide before building)
7. Technical notes (constraints, dependencies)

Max 400 words. Scannable. No jargon.