I'll help you build a full-screen powder/sand simulation with multiple elements! Let me first generate a design brief and understand your codebase structure.

I can see the design inspiration features dark, sophisticated interfaces with natural earth tones. Now I'll create a full-screen powder simulation with an elegant UI for element selection.

I've created a full-screen powder simulation with realistic physics! The app features sand that falls and piles up, water that flows and spreads horizontally, and immovable rock elements. The dark, sophisticated UI matches the design inspiration with earth-toned particles. Click or drag to paint elements, and watch them interact with gravity and each other in real-time.