The first line of a LinkedIn post is the only bit that shows above the "see more" fold on mobile. It earns the click. This generator gives you 9 angles — curiosity-gap, number-led, contrarian, story, question, outcome, pattern-interrupt, authority, confession — so you stop defaulting to the same opener. Pure heuristic, no LLM. Above-fold mobile cap (90 chars) flagged. Pairs with /tools/markdown-to-linkedin.