---
title: "Category page stream layout mismatch — Quick Fix"
type: quick-fix
date: 2026-06-03
---

# Category page stream layout mismatch — Quick Fix

## Bug
After clicking a card on 资料分类 (`/categories`) and landing on `/category/:slug`, the resource bubbles render with narrower bubbles / different waterfall spacing than the 全部资料 page (`/browse`). Both pages use the same `MessageStream` component, but the page-level wrapper applies extra horizontal padding only to the category route.

## Root Cause
`src/layouts/PublicLayout.tsx` chooses the `<main>` padding using a flag named `footerInContentFlow`, defined as:

```ts
const footerInContentFlow = stripLangPrefix(pathname) === "/browse";
```

That flag selects the `px-0 ... md:px-9 xl:px-0` zero-mobile-padding branch — which is the layout `MessageStream` is designed for (it manages its own inner `max-w` and centers bubbles). All other routes fall through to the default `px-4 min-[440px]:px-5 sm:px-6 md:px-9 ...`, which on mobile inset the stream by 16–24 px and shrunk each bubble's `max-w` proportionally. Because `/category/:slug` rendered the same `MessageStream`, that extra inset is exactly what made the category waterfall look "off" vs `/browse`.

## Fix
Extend the same zero-padding branch to also match `/category/<slug>`, so both routes share the wrapper that `MessageStream` was designed to live in.

### Files Modified
- `src/layouts/PublicLayout.tsx` — renamed the flag's derivation to also include `/category/*`. Kept the existing `BackToTop` and footer-in-content checks (`stripLangPrefix(pathname) === "/browse"`) untouched, since those are separate features the user did not ask to share with category pages.

## Verification
- `npx tsc --noEmit` — clean.
- `npm run format:check` — clean.
- `npm test` — 49/49 passing.
- Visual: opening `/categories` → tapping a category card now lands on a `/category/:slug` view whose `<main>` matches `/browse` (no extra mobile horizontal inset), so bubbles render with the same `max-w-[358px]` width.

## Notes
- The flag is still called `footerInContentFlow` for now even though it only controls padding, matching prior code; renaming would expand the change footprint beyond this fix.
- BackToTop and the `footerInContentFlow` footer slot remain `/browse`-only — those are independent of layout width and the user didn't ask to enable them on category pages.
