Interactive presentation builder

Build slide decks that run as a website and are projected to a room. The deck is the visual half of a talk; the presenter does the talking. Two ways to build, one shared design language.

First, the mental model (read before writing any code)

There is one operator (the presenter) on one machine. Slides go on a big screen; the audience only looks — they never click, type, or interact. Everything below follows from this. Three failure modes to avoid: