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Nothing in the app respected prefers-reduced-motion — the kit's data-open/closed animations, the skeleton pulse, and the sidebar width transition all ran unconditionally. Add a global base-layer rule that collapses animation/transition durations to a single frame when the OS asks for reduced motion; one rule covers current and future additions. Add overscroll-y-contain to the scrollable modal/popup surfaces (DrawerContent, SelectContent, ComboboxPopup) so flicking past the end of their content no longer chain-scrolls the page beneath, and to AlertDialogContent for when it gains scrollable content. Verified in the built CSS: the media query and overscroll-behavior-y:contain both compile into dist/assets. Closes #71 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>