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🎨 Themes

The sandbox ships four built-in themes that change the shell color palette without affecting the mounted module or the stage iframe.

Theme switcher screenshot

Switching themes

The brush icon button in the topbar opens a dropdown listing all four themes with color-swatch previews and a check mark on the active selection. The chosen theme persists across sessions via localStorage — no page reload needed.

Available themes

Carbon Slate

Carbon Slate screenshot

The default theme. Deep carbon background with a teal/cyan accent. Designed for long sessions in low-light environments.

Obsidian Amber

Obsidian Amber screenshot

Near-black background with a warm golden amber accent. Reminiscent of classic amber phosphor displays.

Violet Circuit

Violet Circuit screenshot

Dark background with a lavender/purple accent. Clean and modern, easy on the eyes for extended use.

Phosphor Green

Phosphor Green screenshot

Black background with a bright terminal green accent. Evokes classic green phosphor monitors.

Notes

  • Themes apply only to the sandbox shell UI. The mounted module stage runs inside an isolated iframe and is not affected.
  • The active theme is stored under the harness-theme key in localStorage and reapplied server-side on the next page load to prevent a flash of the default theme.
  • All four themes share the same layout, spacing, and icon set — only the color palette changes.