---
phase: 04-polish-audio
plan: 02
subsystem: ui
tags: [css-animations, responsive, error-handling, accessibility]

# Dependency graph
requires:
  - phase: 03-gameplay
    provides: "Lesson screen with falling letters, forest scene, companion area"
provides:
  - "Leaf-fall sinusoidal sway animation replacing letter-float"
  - "Stardust CSS particles on correct keypress dissolve"
  - "Companion avatar float animation"
  - "prefers-reduced-motion accessibility support"
  - "Responsive layout down to 700px"
  - "Global error handler with child-friendly overlay"
affects: []

# Tech tracking
tech-stack:
  added: []
  patterns: ["CSS pseudo-element particles", "prefers-reduced-motion media query", "global error overlay pattern"]

key-files:
  created: []
  modified:
    - src/styles/main.css
    - src/main.ts
    - index.html

key-decisions:
  - "Stardust particles use box-shadow on pseudo-elements for 6 total sparkle points"
  - "Error overlay uses tree emoji and German child-friendly message"

patterns-established:
  - "CSS-only particle effects via ::before/::after pseudo-elements with box-shadow"
  - "Global error/unhandledrejection handlers at top of main.ts entry point"

requirements-completed: [PLSH-01, PLSH-02, PLSH-03, PLSH-04, PLSH-05]

# Metrics
duration: 2min
completed: 2026-03-29
---

# Phase 04 Plan 02: Visual Polish Summary

**Leaf-fall sway animation, stardust particles, companion float, responsive to 700px, and global error overlay with child-friendly message**

## Performance

- **Duration:** 2 min
- **Started:** 2026-03-29T16:14:45Z
- **Completed:** 2026-03-29T16:16:47Z
- **Tasks:** 2
- **Files modified:** 3

## Accomplishments
- Replaced letter-float with sinusoidal leaf-fall animation (lateral sway + vertical descent)
- Added stardust CSS particles on .falling-letter--dissolve via ::before/::after pseudo-elements with box-shadow sparkle
- Added companion-float animation for gentle avatar bobbing
- Added prefers-reduced-motion media query disabling all animations
- Added responsive styles at 700px (smaller keys, scaled fonts, adjusted grids)
- Added global error handler catching uncaught exceptions with kindgerechtes overlay

## Task Commits

Each task was committed atomically:

1. **Task 1: Enhanced CSS animations + responsive layout** - `3a79379` (feat)
2. **Task 2: Global error handler + error overlay** - `f3cb948` (feat)

## Files Created/Modified
- `src/styles/main.css` - Leaf-fall, stardust, companion-float keyframes; error overlay styles; reduced-motion + responsive media queries
- `src/main.ts` - Global error + unhandledrejection event listeners
- `index.html` - Error overlay div with tree icon, message, and reload button

## Decisions Made
- Stardust particles use box-shadow on pseudo-elements for 6 total sparkle points (efficient, pure CSS)
- Error overlay uses tree emoji and German child-friendly message ("Oh, der Wald braucht kurz eine Pause...")

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- All visual polish complete (animations, responsive, error handling)
- Ready for remaining Phase 04 plans (audio, export/import)

---
*Phase: 04-polish-audio*
*Completed: 2026-03-29*