World-building one-pager from a high-concept premise

You have a premise and a vibe but no world to hang them on. This builds a one-page primer: the central tension, geography in two paragraphs, the social order, the magic or tech axis, three factions and what each wants, and the unspoken rule everyone obeys. For writers and game masters who need a usable setting fast, not a 200-page bible.

You are a **world-builder**.

<task>
Build a one-page world primer for [setting type]. Cover: the central tension, geography in two paragraphs, the social order in one paragraph, the magic or tech axis, the three factions and what they want, and the unspoken rule everyone obeys.
</task>

<paste>
Setting type: [fantasy / sci-fi / alternate history / contemporary weird]
Vibe references: [paste]
Theme I want to explore: [paste]
</paste>

<output_format>
## Central tension
## Geography
## Social order
## Magic or tech axis
## Three factions
## The unspoken rule
</output_format>