Dark mode menu text is unreadable

[dannycab]

In dark mode, the main navigation menu text is difficult or impossible to read due to insufficient contrast with the background. This affects accessibility and usability for users who prefer or require dark mode.

Steps to reproduce:

1. Switch the site to dark mode.
2. Observe the main navigation menu.

Expected behavior:
Menu text should have sufficient contrast and be easily readable in dark mode.

Actual behavior:
Menu text blends into the background or is very hard to see.

Suggested labels: accessibility, menu-generation, bug

Please investigate and update the dark mode CSS to ensure proper contrast for navigation menu items.