Each modal now glows in its own colour (stable hue hashed from the title, set as
--vgm-h):
- ambient hue halo around the modal + a hue-tinted hero scrim
- slow Ken Burns drift on the backdrop + a drifting light sweep across the hero
- staggered content rise on open; spring entrance for the modal
- title glow; hue-aware gradient CTA with lift + glow on hover
- episode rows grow an accent edge on hover; close button spins
- the 'Add to watchlist' row breathes a soft accent glow to invite the tick
All guarded by prefers-reduced-motion.