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Critical first-paint CSS (FOUC guard) — mea-web.
Loaded as a RENDER-BLOCKING in immediately after
the design tokens (tokens.css + themes/default.css), and BEFORE
the heavy per-page @layer sheets and web.css. Its sole job is to
paint the page background on the FIRST paint so there is no flash
of an unstyled (white) page before web.css' `body { background:
var(--t-bg) }` rule arrives.
Why a separate sheet and not inline