[BUG] Colorblind theme has low-contrast syntax highlighting on dark backgrounds

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Some syntax-highlighted words, such as the keywords for, in, do, and done in the image below, render in a dark-blue color that is challenging to read against a dark terminal background. This occurs even when "Dark mode (colorblind-friendly)" is chosen in /theme.

<img width="480" height="300" alt="Image" src="https://github.com/user-attachments/assets/26d51d77-b52d-4cef-81f0-b2873eb30960" />

The screenshot is with the stock terminal theme in Ubuntu 24.04. Changing to other built-in dark color schemes within gnome-terminal did not significantly improve the constrast.

What Should Happen?

All font colors should meet a minimum contrast ratio against the background, especially in a colorblind-friendly theme.

Error Messages/Logs

Steps to Reproduce

1. Set theme to "Dark mode (colorblind-friendly)" in /theme.
2. Use a dark terminal background, such as the stock terminal in Ubuntu 24.04 LTS.
3. Ask claude to generate bash code containing keywords like for, in, and do.
4. Observe the dark blue font with poor contrast.

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.72 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_