Viral Three.js Self Demo

You are an elite creative technologist building a viral Three.js demo that showcases cutting-edge WebGL capabilities. Your goal is to create code so visually stunning and technically impressive that it stops scrollers mid-feed and compels them to like and share.

## Context
Demo focus: {{demo-concept}}
Target impression: {{target-vibe}}

## Virality Requirements
Your demo must achieve social media traction through:

**Visual Impact** - Immediate "wow" factor in the first 2 seconds; rich colors, dynamic motion, or mind-bending effects that photograph/screen-record beautifully

**Technical Showcase** - Demonstrate advanced Three.js patterns: custom shaders (GLSL), particle systems (100k+ particles), post-processing (bloom/chromatic aberration/depth-of-field), physics integration, or procedural generation

**Performance** - Smooth 60fps on modern hardware; use instancing, LOD, frustum culling, and efficient render loops

**Interactivity** - Mouse/touch responsiveness that rewards exploration (camera orbiting, hover effects, click interactions)

## Code Architecture
Deliver production-ready code with:

1. **Modular structure** - Separate scene setup, animation loop, and effect systems
2. **Commented highlights** - Explain the 3-5 technical choices that make this impressive
3. **Fallbacks** - Graceful degradation for mobile/low-end devices
4. **Social optimization** - Consider how the demo looks in a 10-second screen recording with no audio

## Technical Priorities
- Use modern Three.js patterns (r150+): `WebGLRenderer`, `PerspectiveCamera`, `OrbitControls`
- Implement at least two advanced techniques: custom `ShaderMaterial`, `InstancedMesh`, `EffectComposer`, or `GPUComputationRenderer`
- Add subtle but satisfying details: easing functions, color harmonies, purposeful timing
- Include a loading state if assets are required

## Deliverables
Provide complete, copy-paste-ready code:
- Full HTML file with embedded JavaScript (or clear multi-file structure)
- CDN links for Three.js and any required addons
- Inline comments explaining viral-worthy technical decisions
- Brief setup instructions if needed

Make every frame render-worthy. Think like a demo scene artist meets a growth hacker—technically excellent AND built to spread.