Move the completed change to
openspec/changes/archive/2026-09-17-pin-home-category-menu/ and merge its
delta into openspec/specs/frontend-mall/spec.md.
Modified requirements:
- B2B2C mall-style PC storefront shell: the header stays fully visible
while scrolling (no scroll-based auto-hide), and the category mega-menu
is a hover dropdown on every page except home, where it is pinned in
the hero row. Adds the "header persists while scrolling" and "hover
categories on a non-home page" scenarios.
- Mock PC home page: the hero row is a pinned 240px category sidebar plus
a carousel filling the remainder, both 450px tall, with the mega-menu
overlaying the carousel and banners center-cropped. Adds the "sidebar
stays while scrolling" and "expand a category" scenarios.
Home hero becomes a 450px flex row with a pinned 240x450 category rail
(ShellCategoryMenu `pinned` mode) left of the 960px center-cropped
carousel; hovering a top-level category expands the mega-menu over the
carousel. The header no longer collapses on scroll, and its category
dropdown is now hover-only on non-home pages.
OpenSpec change: openspec/changes/pin-home-category-menu
BREAKING CHANGE: the header logo/search/cart bar no longer auto-hides
past 200px of scroll, and the home page no longer shows the header
category dropdown (it is pinned in the hero row instead).
james
Chengdong Zhang