Each top-level child rises+fades in, staggered (0.4s, ease-out), so every page enters the same way and nothing appears instantly; honors prefers-reduced-motion. Replaces ad-hoc per-page motion.div entrance wrappers. One component → the look is tunable in one place.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>