The shell with the “+” button and the “Add video” sheet, the poster tint, the Comfortable card (one full-width card per row on the phone; 16:9 landscape, 4:5 portrait) and the Compact row in every variant, screen states, the section placeholder and the skeleton video screen in Ambient. The chip row and the “Newest ▾” toolbar belong to E4/E8 and are not in the E1 feed. Phone 375×812, dark theme; desktop 1280×800, scaled down.