Emphasis
Each scope redefines --fill-*, --ink-*, --stroke-*, and --accent within itself. Components don't know which scope they're in — they just use the tokens. None is the default — the resting state. Alternate bounces against None to create rhythm. Focused brings something forward. Muted is a dull spot that takes a back seat. Immersive takes over.
Default
No data-emphasis — the page-level token defaults stand.
data-emphasis="alternate"
data-emphasis="focused"
data-emphasis="immersive"
Nested scopes
The next four sections are wrapped in a section-group with data-emphasis="alternate". All subsections inherit it unless they override; overrides don't leak past the inner section.
Second section — still alternate.
Override: focused.
Back to alternate — overrides don't leak.