Pretty HTML

The deliverable is a clean, finished artifact the user can open locally, keep, screen-share, or send onward — not a draft and not a web project. The bar is "immediately useful and good-looking with zero follow-up fixes".

Start from assets/template.html (copy, then adapt) — it carries the theming, toggle, and baseline rhythm already correct. Deviate freely on layout and components; do not deviate on the invariants below.

Invariants