iOS dark mode renders user prompt bubbles light with dark text when accent color is Black

Summary

On the ChatGPT iOS app, Dark appearance + Black accent color renders the user's prompt bubble as a light gray/white rounded rectangle with dark text instead of a dark bubble with light text.

This makes prompts substantially harder to read for users who rely on a dark UI.

Environment

• ChatGPT iOS app: 1.2026.202 (build 30140022279)
• iOS: 27.0
• Appearance: Dark
• Accent Color: Black

Steps to reproduce

1. Open ChatGPT on iOS.
2. Set Appearance to Dark.
3. Set Accent Color to Black.
4. Open a conversation and send a prompt.

Actual behavior

The conversation background is black/dark, but the user's prompt bubble is light gray/white with dark text.

Expected behavior

With Dark appearance and Black accent selected, the user prompt bubble should remain dark/black with high-contrast light text, or there should be a separate control for prompt-bubble background/text colors.

Accessibility / usability impact

The light prompt bubble is visually jarring in Dark Mode and can reduce readability for users who specifically need white text on a dark background.

Additional context

Switching among the exposed appearance/accent settings does not provide a way to force a dark user-message bubble independently. A screenshot from the affected device shows the dark conversation background with the user prompt rendered as a light bubble.

Start by reproducing the issue in ChatGPT iOS 1.2026.202 with Dark appearance and Black accent color, then compare the prompt bubble with other appearance and accent settings. Done means the user prompt bubble has a dark background with high-contrast light text, or the app provides a separate control for those colors.