The Chemistry behind color

I have been doing some fishing for the reason behind color in pigments. Of course, there is a physics portion to it, in which light waves are detected by the wave and interpreted by the brain as a certain color. But that is what I am not looking for, but instead I want to find the reason for how the chemical configuration has to do with color. It was an interesting search for it in which I encountered lots of information that contained advanced scientific language that was unfamiliar to me. But after some deeper investigation, I managed to place together pieces of the “puzzle” to create an explanation on how electrons help determine color. In chemistry, there are particular groups of atoms that are called functional groups. These functional groups help classify a compound because the functional group determines how it will react and similar things like that. There is a functional group in pigments called chromophores which are the ones responsible for the color of a pigment. Chromophores alter the amount of energy electrons absorb from light waves, enough so that the light they reflect back to us is enough to see. Electrons tend to be associated in the nucleus of as single atom, but chromophores mostly exist in systems where the electrons are not associated with a single atom but instead orbit around lots of adjacent atoms. Delocalized electron systems usually have a stable configuration. An example of a delocalized electron system would be one such as an aromatic. An aromatic is a hexagon shaped chain of carbons. In this system, the carbons are equally spaced from each other and there are non-adjacent double bonds anywhere inside the aromatic. The electrons in an aromatic travel in a circular path all around the aromatic instead of just a particular atom. Chromophores can alter the energy that the electrons absorb until so it is in the visible spectrum of color. Chromophores are a complicated topic and that is why it is difficult to understand the whole aspect of molecular structure affecting color. So many questions generated from the information I gathered. How do electrons actually absorb energy and why? Why do they absorb some light and reflect others? Delocalized electron systems are also complex and require a bigger understanding of chemistry to completely grasp. I understand what they are, but why do they happen? Anyone know?