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A reusable top-glow layer that gives pages with no imagery of their own the same tinted ground the image-backed screens get — emitted as the first sibling of a navigation destination's content, with no wrapper, because destinations already stack. Covers why a null tone must collapse the gradient into the page colour instead of substituting a theme colour, why the scroll-away offset belongs in the draw phase, why the first list item must be taller than the layer, and which screens are right to keep their own copy. Use when a flat settings or list page looks unrelated to the rest of the app, when an idle app shows a glow for nothing, or when a glow snaps out of place as the list scrolls.

Apple's approach to interface design and fluid, physical motion, translated for the web. Use when building or reviewing gesture-driven UI, spring animations, drag/swipe/sheet interactions, momentum and interruptible transitions, translucent materials and depth, typography (optical sizing, tracking, leading), reduced-motion, or the design foundations (feedback, spatial consistency, restraint) behind Apple-style interfaces.