PROMPT:
Create a single, fully self-contained HTML5 page (all CSS and JavaScript inline, no
CDN, no external fonts, no external images, no external SVG files, no libraries)
titled "Somnium — the Dreaming Jellyfish". It is an immersive, full-bleed canvas
scene of a surreal jellyfish made of vapor and half-remembered light: a softly
pulsing bell with ten thousand thread-like tentacles drifting through a sea of
out-of-focus bokeh stars. Moving the pointer looks around (parallax); tapping makes
the creature contract and bloom. The palette is dreamlike violet, peach and cyan on
a deep indigo night. Make it hypnotic, luminous and beautiful; the entire
experience — render loop included — must live inside one file and work offline.

TITLE:
Somnium — the Dreaming Jellyfish (Dream Fauna · No. 096)

DESIGN DESCRIPTION:
A fixed, edge-to-edge dark canvas on a layered indigo radial-gradient background
(#2a1a55 sinking to #120a33), softened by two full-screen overlays: a `screen`-
blended haze of peach/cyan/violet glows and an inset vignette. Over the canvas sits
a fixed UI frame with generous padding — a spaced cyan eyebrow ("Dream Fauna ·
No. 096"), a large serif headline ("Somnium") filled with a white→peach→violet
gradient and a purple drop-shadow, and a caption with italic peach emphasis. The
bottom bar carries a "breathing" status dot beside the hints "drift · move pointer"
and "tap to pulse", plus a small "Oneiric Series" credit. The creature itself is
drawn in pure Canvas 2D: a scalloped bell with a luminous cyan rim, a wet-glass
inner highlight, four soft gonad glows, a fringe of short dancing filaments around
the margin, and dozens of extremely long, tapering, gently swaying tentacles in
peach/cyan/violet tints with glowing nematocyst dots near their tips.

MAJOR VISUAL TECHNIQUES:
- Angle-steered tentacles: each tentacle is a chain of segments whose heading is
  nudged every step by layered sine sways (a function of depth and time), then
  smoothed with quadratic curves and stroked twice — a wide soft glow pass plus a
  thin bright core — using globalCompositeOperation "lighter" for additive bloom.
- Bell geometry built from sampled dome arc points plus a scalloped skirt traced
  with quadratic curves; a beat envelope (cosine power curve) drives a sharp
  contraction that widens, squashes and ripples the bell each power stroke.
- A parallax bokeh field of radial-gradient discs (some hollow rings) that twinkle,
  drift and shift with eased pointer position at depths proportional to their size,
  with a sparse layer of large near-field bokeh drawn in front of the creature.
- Tap physics: a click/tap sets a decaying pulse-flash (extra hard contraction +
  bloom) and spawns expanding ripple rings that fade as they grow.
- Canvas 2D only (no libraries): radial/linear gradients, shadowBlur glow, additive
  blending, DPR-aware sizing, and a prefers-reduced-motion path that renders a single
  static dream frame instead of animating.

INTENDED INTERACTION MODEL:
Fully ambient and interactive. The jellyfish drifts and breathes on its own in a
continuous requestAnimationFrame loop. Moving the pointer (or dragging a finger)
steers the parallax so the whole scene — bokeh and creature — shifts as if you are
looking around inside the tank. Tapping/clicking anywhere makes the bell contract
harder and bloom brighter, sending an expanding ripple through the water, then it
relaxes back into its slow natural beat. The experience is calm and hypnotic,
responsive across screen sizes (fewer, longer tentacles on narrow screens), and
respects reduced-motion by showing one still, dreamlike frame. Everything is
self-contained and offline.