If you were aware that you were dreaming, even for a split second, then it was lucid dream, and it sounds like you were, so congrats on the first lucid!
I believe there are no 'layers' of lucidity though, but there are levels of awareness, which affect quality of both non-lucid and lucid dreams.
As for why you felt disconnected, it might be lack of control, or lack of waking life memory, dream control will improve with practice and you can also check out this tutorial: Dream Control Tutorial - Lucid Dreaming - Dream Views , and if you have trouble remembering waking life memories in the lucid dream, i had the same problem when i was starting out and here's the solution i figured out: try writing/typing them somewhere right before going to sleep and/or using them as mantra.