Feature request: better color-based emphasis in Codex CLI TUI

What feature would you like to see?

Summary

In the Codex CLI interactive TUI, it is hard to visually distinguish important information from normal text.
Even when the model uses Markdown (headings, bold, lists), most text is rendered with very similar colors/styles, so the output looks almost uniform and flat.

---

Current behavior

• Headings, bold text and normal paragraphs look very similar in color and emphasis.
• It is hard to quickly spot:
• the final conclusion,
• key commands / steps,
• important warnings / notes.

As a result, long answers are visually dense and it’s easy to miss the most important parts.

---

Expected behavior

• Stronger visual emphasis for:
• headings (#, ##, ###)
• bold text used for conclusions / key phrases
• warnings / important notes

• Or, alternatively:
• a simple way to configure the TUI theme/styles, or
• a built-in “high emphasis / high contrast” preset that makes important content stand out clearly.

---

Additional context

• When comparing Codex CLI TUI with other AI CLIs (e.g. Claude Code CLI) in the same terminal and same color scheme, those tools make important parts (headings, key phrases, warnings) visually stand out much more, while Codex output looks almost uniform.

• Screenshots comparing Codex CLI TUI vs other CLIs in the same terminal:

• codex cli:

<img width="1230" height="906" alt="Image" src="https://github.com/user-attachments/assets/05aedd90-f201-4843-813c-3767ab2913b1" />

• claude code cli:

<img width="1232" height="1356" alt="Image" src="https://github.com/user-attachments/assets/9f45fe6b-2668-47b4-b42b-ed48392a0abe" />

Additional information

_No response_