Synthwave sunset · seed-2.0-code

The user wants an animated synthwave sunset scene. Let me break down the requirements:

1. Glowing gradient sun with scanlines
2. Setting over an infinite neon grid that scrolls toward the viewer
3. Starfield in the background
4. Reflected horizon

I'll create a single HTML file with CSS and JavaScript embedded. I'll use Canvas for the animations since it's perfect for this kind of dynamic graphics.

Let me structure the file:
- HTML structure with a canvas element
- CSS for styling (dark background, full viewport)
- JavaScript for animations:
  - Starfield generation and animation
  - Sun with gradient and scanlines effect
  - Grid with perspective scrolling
  - Horizon reflection

Let me write this out.

The synthwave sunset animation has been created and written to index.html. The file includes:

1. A canvas-based animation with:
   - Gradient sky from dark purple to pink
   - Twinkling starfield
   - Glowing sun with internal scanlines and pulsing effect
   - Sun reflection on the "ground"
   - Infinite scrolling neon grid with perspective
   - Horizon line with glow effect
   - Vignette overlay
   - CRT-style scanline overlay

2. All code is self-contained in a single HTML file with embedded CSS and JavaScript
3. No external resources or network requests needed
4. Responsive design that handles window resizing

The animation should now be ready to run.