[BUG] User input becomes unreadable when working with a light background

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?

After the latest Claude update, my own inputs (black on white background) become unreadable as soon as I hit return. The background is turned to some dark gray -- which would be a fine highlight for a dark color profile, but makes the text unreadable with a light profile. (I'm running Iterm2 on a mac, but the colors see to be set within Claude, not using Iterm profile defaults). Please make this readable for people using light profiles, or allow users to configure it. Claude says its version is: I'm powered by Claude Sonnet 4.5 (model ID: claude-sonnet-4-5-20250929).

My knowledge cutoff is January 2025.

What Should Happen?

Users commands should be rendered in a way that is readable if the user window has a light profile.

Error Messages/Logs

Steps to Reproduce

1. In a Mac, with Iterm2, with a light profile set up, run Claude
2. Type any query and hit return
3. Notice the visible user query background vs text colors

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.0.83 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_