Initial: pi-skill — 68 skills, 43 extensions, 11 themes for Pi

skills/references/type-venn.md

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+# Venn / Set Overlap
+
+**Best for:** intersection of concepts/domains, shared attributes between categories, "where A meets B", ikigai-style frames (desirable × feasible × viable).
+
+## Layout conventions
+- **Prefer 2 or 3 circles.** Avoid 4+ (unreadable — use a matrix instead).
+- Circle stroke: 1px hairline, color per-set (ink, muted, soft).
+- Circle fill: very low-opacity tint — `rgba(11,13,11,0.04)` for ink set, `rgba(82,83,78,0.05)` for muted. Tints compound naturally in overlap regions.
+- Radii: equal when sets are comparable in size; proportional when sets are meaningfully different. Don't fake equal sizes for aesthetics.
+- **Set labels** placed outside the circle, NEVER crossing the stroke. Geist 12–14px 600 for the set name, optional Geist Mono 9px sublabel.
+- **Intersection labels** placed inside the overlap region, Geist 12px 600, centered. For small overlaps, use a leader line to a label in clear space.
+- **Coral accent** on the ONE focal intersection — the "sweet spot". Either coral label stroke OR clipPath-bounded coral fill tint (`rgba(247,89,31,0.10)`).
+- Circle centers and radii divisible by 4.
+
+## Anti-patterns
+- Unlabeled regions — reader can't tell which set is which.
+- Circles that don't overlap when overlap is the point.
+- Equal-sized circles when sets are obviously different (dishonest).
+- Coral on multiple overlap regions (focal signal dies).
+- Labels sitting on top of circle strokes (illegible).
+- 4+ circles where 2–3 would do.
+
+## Examples
+- `assets/example-venn.html` — minimal light
+- `assets/example-venn-dark.html` — minimal dark
+- `assets/example-venn-full.html` — full editorial