You seem to accept science as it is that offers no explanations about even having a designer so why put a burden of proof on someone else that you don't even put on yourself? And besides, what does the means, motives, and etc have to do with science? Why is it considered necessary to answer those questions when science can't do it either?
Science does describe the design process in enormous detail, and the level of detail gets finer all the time. It's called variation and selection. It's been modeled in computer programs -- even the commercial programs that manage the electric power grid.
There is nothing random about evolution, except the source of variation (which has, by the way, been observed in great detail). Selection is the same process observed by adam Smith and codified by conservative economists. In economics it's called the invisible hand. In biology it's called natural selection.