Gmail is one of the most-used email clients in the world, which makes it a good subject for studying how a mature product handles a genuinely hard interaction problem: composing and reading email without losing your place in a long list.
This recreation covers the compose window in its collapsed, expanded, and full-screen states, plus the reading pane and its reply/forward affordances — rebuilt component by component in Figma to see how Google structures the underlying design system rather than just eyeballing the surface.