Critical Requirements

1. Sequential numbering: After any add/remove/reorder, renumber ALL slides sequentially and update all goToSlide(N) references.
2. Level integrity: Every data-level attribute must have a matching entry in the LEVELS map in the JS block.
3. Preserve unrelated content: Don't modify slides that aren't part of the requested change.
4. Match existing patterns: Reuse the styled-box classes (.analogy-box, .trigger-box, etc.) rather than inventing new ones.
5. Non-technical voice: This presentation is for non-engineers. Keep language plain. Lead with analogies.