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Nice work.
On the computer, I can only see the dark backgrounds making the cut because of contrast.
I don't think the contrast ratio is up to web standards, especially the smaller type. May be difficult to read. Use your hexadecimals on the following page to check.
http://www.snook.ca/technical/colour_contrast/colour.html
Clever idea linking the rings. Simplicity is hard to do.

Thanks for your comments! I created this for print, but I'll defintily bring it up to web standards. Thanks for your help and that link! : )