I can see the issue. The error is happening because the browser URL contains query parameters and tokens that are being interpreted as part of the selector when using getElementById. The problem is likely in the scroll handling logic. Let me fix this by ensuring we only use the clean section ID without any URL parameters:

I've fixed the querySelector error by replacing getElementById with querySelector using proper attribute selectors and added safe navigation handling. The issue was caused by URL parameters interfering with the element selection. Now the navigation uses querySelector('[id="sectionName"]') which safely handles any special characters in the URL and prevents the syntax error.

I can see the issue with the theme toggle. The current implementation only toggles the dark class on the document element, but it doesn't persist the theme preference or properly initialize it. Let me also check if there are any CSS variables or theme configurations that need to be updated:

Now I can see the issue. The theme toggle is working but there are several problems: 1) It doesn't persist the theme preference, 2) It doesn't initialize properly on page load, and 3) The light mode CSS variables aren't properly configured for a light theme. Let me fix the navigation component to properly handle theme switching:

I've fixed the dark/light mode toggle by adding proper theme persistence using localStorage, correct initialization on page load, and improved light mode styling. The theme now properly saves the user's preference and maintains it across page reloads, with better contrast and visual consistency in both light and dark modes.