Millimeter

The demo company, Gauge, a fictional analytics startup, has a product page and four feature pages, pricing, customers, a changelog, docs, careers and a sign-in screen. It is the marketing site, not the product: the sign-in screen and product pictures are designs, with no analytics or accounts behind them. Cream paper, ink type, a drafting hatch behind the panels and real values dimensioned with ticks set the look, and a library of 44 section layouts at /layouts is ready to lift out and refill. All the demo copy lives in one file. It comes as React with plain HTML, and we wrote the drawing's rules into AGENTS.md, so an AI tool adding a page keeps it on the same sheet.