Interactive 3D snow globe browser scene with snow and weather controls

Create "Snow Globe" — a beautiful, interactive 3D snow globe that users can shake and watch settle in their browser. Deliver one complete standalone HTML file using genuine WebGPU with WGSL shaders. ART DIRECTION - A glass sphere on a turned wooden base, large and centered, on a warm off-white background with soft studio lighting and a subtle ground shadow. - Inside: a tiny procedural winter village — three or four cottages with pitched roofs and softly glowing windows, a few layered pine trees, a small footbridge, and a snow-covered ground mound. - The glass should read as real glass: refraction that visibly bends the village at the edges, Fresnel reflections, a crisp window-shaped highlight, and a faint rim caustic on the base. - Mood: cozy, quiet, a little magical. Keep it elegant and uncluttered. GEOMETRY - Generate all geometry procedurally. No external models, textures, or image files. - The village must sit fully inside the sphere with nothing clipping through the glass. - Snowflakes are small, soft, slightly varied flakes, not uniform dots. Include a toggle for sparse glitter flecks that catch the light. SNOW AND WATER PHYSICS - Simulate several thousand snow particles on the GPU in a compute shader. - Shaking the globe moves the water: particles swirl in vortices, trail behind the motion, and slosh back when the shake reverses. Use a simple fluid velocity field or curl-noise flow driven by the globe's motion, not independent random drift. - After shaking, flakes slow down, drift, flutter, and settle over roughly 10–20 seconds. - Settled snow accumulates on roofs, tree branches, and the ground, and is knocked loose by the next shake. - Particles must never escape the sphere or pass through the village. Use fixed simulation steps and bounded velocities so violent shaking stays stable. INTERACTION - Click-drag or touch-drag the globe to shake it; faster drags produce stronger swirls, and the globe itself tilts and springs back. - On mobile, a "Use motion" button requests device-motion permission (required on iOS) and lets the user shake the phone. - Right-drag or two-finger drag orbits the camera, with limited zoom. Keep camera gestures separate from shaking. CONTROLS - Give it a shake (auto-shake button) - Reset, Reset view, Pause - Snow amount slider - Water thickness slider (how slowly flakes fall) - Glitter toggle - ¼ speed toggle - Three scenes: Alpine Night, Cabin Dawn, Northern Lights (aurora glow in the sky dome inside the globe). Switching scenes must not reset the snow. INTERFACE - Top left: small "MATERIAL STUDIES" label, large italic serif heading "Snow Globe.", caption "Shake gently. Wait patiently. Winter keeps." - Top right: WebGPU status indicator. - Right side: compact "THE KEEPSAKE" control panel. - Bottom left: a short interaction hint. - Clean sans-serif controls, thin borders, generous whitespace. Adapt to mobile without covering the globe