Fill tiers: which rung, and why

The EDS colour ladder gives every family — accent, neutral, info, success, warning, danger — fifteen steps in stacking order: canvas, surface, three muted fills, three borders, three emphasis fills, two texts, two texts on emphasis (the public palette generator's PALETTE_OVERVIEW.md in equinor/design-system lists them; checked 2026-09-06). This skill answers one question about it: when an element needs a background, which rung is it? The answer turns on a single test.

The fill rungs are for things you can press. Static areas sit on the canvas and surface tiers.

This skill emits no values: the colours come from the palette; this is the rule for binding them.

1. Is it interactive?

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