Design a Minimal Single-Page Web Application for Mvp

We are seeking a skilled ui/ux designer to design (not develop) a very simple single-page web application (spa) for a minimum viable product (mvp).
The purpose of this project is only to create the design — no coding or development is required. The goal is to validate the core idea and gather initial user feedback, not to build a fully-featured product.

Core Concept:
- One main screen.
- Users will be presented with a series of test questions.
- A key interactive component will be an AI copilot chat, where users can ask for assistance and explanations as they engage with the questions.

Notes:
- The design should be minimal, clean, and highly functional, prioritizing user experience and clarity.
- Technical details will be discussed privately for those who are interested.
- Responsive design (desktop and mobile views).
- The utmost importance is placed on speed of delivery and simplicity to achieve rapid iteration and feedback collection.