Colours move into theme tokens (light values in :root, dark in [data-theme=dark]); the closing contact band inverts on each theme. The choice is stored in localStorage and applied by a head script before the first paint. Voxel covers and image shadows follow the theme. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01XtcZtnG4GQA1d6mW5PNrS9