"Flat bar road bike" is a category worth looking into:
https://www.eriksbikeshop.com/cyclin.../style_Flatbar
What I can't tell you is how light is light. Chances are, the offerings for flat bar road bikes top out before drop bar road bikes do.
Take the marketing pictures with a grain of salt... most of the bikes shown are a size too small for how high they've raised the saddles, because it looks sporty and cool that way. The one you actually buy should fit your body, not the photographer's preconceptions.