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Synthwave sunset · seed-2.0-code

Create an animated synthwave sunset: a glowing gradient sun with scanlines setting over an infinite neon grid that scrolls toward the viewer, with a starfield and a reflected horizon.

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transcript · 4 messages
user

Create an animated synthwave sunset: a glowing gradient sun with scanlines setting over an infinite neon grid that scrolls toward the viewer, with a starfield and a reflected horizon.

assistant
thinking
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.
write /tmp/ws/index.html (12337 bytes)
toolResult

Successfully wrote 12337 bytes to /tmp/ws/index.html

assistant
thinking
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.

I've created a complete animated synthwave sunset scene in `/tmp/ws/index.html` featuring: - **Glowing sun** with gradient colors, internal scanlines, and pulsing effect - **Infinite neon grid** scrolling toward the viewer with perspective - **Twinkling starfield** in the dark purple sky - **Sun reflection** with wave distortion on the horizon - **CRT scanline overlay** and vignette for authentic retro feel - **Neon colors**: pinks, purples, and cyan grid lines The animation uses Canvas for smooth 60fps rendering and is fully self-contained with no external dependencies. You can open it in any browser to enjoy the infinite synthwave sunset experience.

TAKE IT TO CODE

A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.

RUN

modelseed-2.0-code
vendorByteDance · Seed
harnesspi-agent
generated2026-08-13

EVALUATION

4/5 working

Nice animated synthwave sunset with glowing sun, scanlines, neon grid, and starfield; inputs don't alter the scene.

Vision grade · anthropic/claude-sonnet-5

MEASUREMENTS

Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.

idle motion12.6%
on click12.4%
on drag13.9%
on wheel8.3%
on enter + space8.2%
on arrow keys9.3%
on w/a/s/d11.1%
frame spread31.7 / 255
console errors0
js errors none

METRICS

runtime59.8s
tokens in7.4k
tokens out4.2k
cached3.2k
cost / run$0.0148