---
id: S06
parent: M007
milestone: M007
provides:
  - Mobile-safe technique page layout — no horizontal overflow on 412px viewports
requires:
  - slice: S05
    provides: Key moment card overflow fixes — S06 builds on the same overflow-prevention approach
affects:
  []
key_files:
  - frontend/src/App.css
key_decisions:
  - Applied flex-wrap at base level rather than only in mobile media query — wrapping works at all widths
  - Capped version-switcher at 12rem on mobile with text-overflow ellipsis
patterns_established:
  - (none)
observability_surfaces:
  - none
drill_down_paths:
  - .gsd/milestones/M007/slices/S06/tasks/T01-SUMMARY.md
duration: ""
verification_result: passed
completed_at: 2026-03-30T19:49:14.516Z
blocker_discovered: false
---

# S06: Mobile Viewport Overflow Fix — Technique Pages and Global Content

**Added CSS flex-wrap, max-width constraints, and tighter mobile gaps to prevent horizontal overflow on ~412px viewports for technique pages and global content.**

## What Happened

This slice addressed horizontal overflow on mobile viewports (~412px, Galaxy S25 Ultra) for technique pages and global layout elements. A single CSS-only task added five targeted rules to App.css:

1. `.technique-header__tags` — added `flex-wrap: wrap` so topic tags wrap instead of overflowing horizontally
2. `.technique-header__creator-genres` — new rule block (the class existed in TSX but had zero CSS). Added `display: flex`, `flex-wrap: wrap`, and `gap` so genre pills wrap on narrow screens
3. `.version-switcher__select` — capped at `max-width: 12rem` on mobile with `text-overflow: ellipsis` to prevent long version strings from overflowing
4. `.app-main` padding — tightened from 1.5rem to 1rem at ≤640px to reclaim horizontal space
5. `.technique-header__meta` gap — reduced on mobile for tighter layout

All changes are CSS-only, no TSX modifications. The flex-wrap rules were applied at base level (not inside media queries) so wrapping works at all widths, with mobile-specific refinements for gap and padding inside the 640px breakpoint.

## Verification

Frontend build passes (48 modules, 791ms). grep confirms `flex-wrap: wrap` and `technique-header__creator-genres` present in App.css. All three verification commands from the plan exit 0.

## Requirements Advanced

- R006 — Technique page now renders cleanly on mobile viewports — tags wrap, metadata stays within bounds, no horizontal scroll

## Requirements Validated

None.

## New Requirements Surfaced

None.

## Requirements Invalidated or Re-scoped

None.

## Deviations

None.

## Known Limitations

No automated visual regression testing — mobile layout verified by CSS rule inspection only, not by rendering on an actual 412px viewport.

## Follow-ups

None.

## Files Created/Modified

- `frontend/src/App.css` — Added flex-wrap on .technique-header__tags, new .technique-header__creator-genres rule, max-width + ellipsis on .version-switcher__select, tighter .app-main padding and .technique-header__meta gap at ≤640px
