/* ========================================================================= surface-shell — canonical implementation. The shared page shell for a family of public surfaces: an identity mark, surface identity, title, lede, an optional status badge, an optional payload control slot, the rule that opens the payload, and the footer that closes the page. The shell owns the chrome around the payload. It owns no payload. This is a canonical pattern, vendored downstream at a pinned commit. It carries no organization's identity: a consuming project supplies its own Tier 3 — the same boundary the output-artifact pattern already draws. It composes existing var() roles and introduces no token and no palette color. Two literal COLOR values appear, and only two: the focus glow's translucent white, which the repo README's hover/press/focus contract specifies verbatim and for which no token exists; and the `transparent` keyword, which clears the breadcrumb's rest underline while its focus indicator is showing — a keyword for the absence of paint, not a color drawn from anywhere. Adding any other raw color value here is a defect. That assertion governs color, and only color. Geometry, tracking, and border widths do carry raw values where no token expresses them. Text size is the one dimension held absolutely: every font-size in this file resolves through the foundation's type scale, and a raw numeric size here is a defect. Because it frames a whole page, this pattern owns that page's landmark structure, and the required elements are part of the contract, not a styling preference:
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