fieldseal-dev/fieldseal-spec ? reverse-engineered prompt

Build me a polished documentation site for Fieldseal, the draft spec for transparent field level encryption at the data access layer.

I want the homepage to clearly explain what the project is, who it is for, and what it is not, in plain language. Include sections for the spec, design docs, reference implementations, test vectors, and implementation notes, with easy navigation and cross links. Make it feel like a serious standards style project, but still readable for engineers and curious non experts.

The site should work well as a public project landing page, with a clean layout, strong typography, and simple responsive styling. If it helps, use the existing docs and README content as the source of truth, and look up current docs online if you need to. Add clear callouts that this is pre alpha and not production ready. Also make room for future language specific implementation pages and adapters, even if some are just placeholders for now.