I'll help you create an interactive art demonstration based on the concept of lime production and its uses in traditional architecture and craftsmanship.

I've created an interactive demonstration that illustrates the traditional Chinese process of limestone production and its various applications. This demonstration covers:

1. The Limestone Process - A step-by-step visualization of how limestone is mined, burned, slaked, and refined, with interactive animations for each stage.

2. Practical Uses - Showcasing the various traditional applications of lime, including:

   • Boat sealing with tung oil and fish oil
   • Masonry for wall construction
   • Wall plastering
   • Waterproof reservoirs
   • Papermaking
3. Three Layer Soil (三和土) - An interactive demonstration of this remarkable traditional waterproof construction technique that combines lime (1 part), river sand (2 parts), and yellow soil (2 parts) with binding agents like glutinous rice juice and Chinese thorowax root juice.

The interface is fully interactive, allowing users to:

• Navigate between different sections using tabs
• Step through the limestone processing stages
• Control animations for each process
• Adjust parameters like layer count and mixing intensity in the Three Layer Soil demonstration
• Explore detailed information about each application

This demonstration helps preserve and share this important traditional knowledge about lime production and use in Chinese architecture and craftsmanship.

I've fixed the bugs and enhanced the animations as requested:

Fixed Issues:

1. Fixed the "Refining" stage button - The button now correctly sets the active stage to "refining" instead of "slaking".

2. Added complete content for the Refining stage - The refining stage now shows:

   • A top container with raw lime
   • A middle sieve with a grid pattern
   • A bottom container that collects the refined lime
   • Animated falling particles when the animation is active

3. Enhanced the fire animation in the Burning stage with:

   • Multiple layered semi-transparent gradients (orange, red, yellow)
   • Different animation speeds for each layer to create a more realistic effect
   • Ember particles that float upward when animation is active

4. Added artistic water effects to the Slaking stage with:

   • Layered semi-transparent cyan/blue gradients
   • Subtle wave animations with different timing for each layer
   • Improved reaction visualization

Added Features:

1. Integrated Unsplash API to fetch relevant background images for each stage using the provided API key. These images appear as subtle backgrounds behind each process visualization.

2. Added more detailed animations throughout all stages:

   • Mining: Improved visualization of limestone layers
   • Burning: Realistic fire with embers and multiple flame layers
   • Slaking: Enhanced water effects with wave animations
   • Refining: Sifting animation with falling particles

All animations now use multiple semi-transparent gradient layers with small-range cyclic animations as requested, creating a more artistic and visually appealing demonstration.