The novel core: depth as something that OCCURS. The elevation dimension now lives
in the event firma (the two-moment model event moment) — leveraging the existing
signature system, NOT a parallel one:
- present-rise (emerge): the box-shadow grows from flat -> the element resting
plane shadow as it rises. A flat element (no resting shadow) is a no-op; a
raised/overlay element animates its elevation proportional to ITS plane.
- press-squeeze (contact): the shadow flattens to the surface at the press peak,
then returns (recede).
So depth + position/scale + sound + haptic all fire coordinated from one event.
Degrades with reduced-motion (the global events.css cap); a theme overrides the
keyframes/signatures (jaula abierta). No reference framework treats depth as eventful.
Fase 2 (computed mode-adaptive shadow mix) deferred — the shadows are already
mode-aware, so it is a refinement, not a gap (documented in the RFC).
Verified: check 0 errors; motion + config + generated tests pass; browser — the
present-rise keyframe is live with the box-shadow dimension.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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