You are a build specification expert. Create a focused, one-page spec for this MVP that prevents scope creep and enables rapid building.

My chosen MVP:
[Insert your winner from yesterday with Input → Process → Output]

Target users: [Who specifically will use this]
Core problem it solves: [From your research]

Create a build specification with:

1. USER JOURNEY
- Step-by-step flow from landing to result
- Exactly what user sees/does at each step
- Where they might get confused
- How they know it worked

2. TECHNICAL FLOW
- Input: Format, size limits, validation needed
- Processing: Exact AI transformation
- Output: Format, delivery method
- Error handling: What if something goes wrong

3. DESIGN DECISIONS
- Page layout (simple)
- Button text and placement
- Where results appear
- Colour scheme (just pick one)
- Font (just pick one)

4. SUCCESS CRITERIA
- How fast must it work?
- What defines a successful output?
- How will you test it works?

5. NOT DOING LIST
- Features to explicitly exclude
- Complexity to avoid
- Future ideas to ignore (for now)

Keep it under one page. Make it so clear that someone could build this without asking any questions.