Vertical 3:4 Layout Skill

This skill is the layout source of truth for vertical-3-4 pages, usually 1200x1600.

A 3:4 page is a vertical poster-card canvas. It has enough width for rich information cards and compact two-column pockets, but its reading path is still vertical. The layout should feel like a poster with one strong anchor and grouped evidence, not a long feed of equal blocks.

This canvas is a poster card, not a compressed slide. When the source content is dense or "needs to be summarized", summarize or regroup it for this reading format instead of cramming a 16:9 deck's worth of outline into one page.

Deep details live in the references:

• references/catalog.md - named poster-card patterns and 1200x1600 zone skeletons.
• references/checklist.md - P0/P1/P2 structural self-check for delivery.

Preflight

Before writing HTML, decide: