# Phase 4: Polish + Audio - Discussion Log (Assumptions Mode)

> **Audit trail only.** Do not use as input to planning, research, or execution agents.

**Date:** 2026-03-29
**Phase:** 04-Polish + Audio
**Mode:** assumptions
**Areas analyzed:** Audio Architecture, Speech Synthesis, Animations, Responsive, Error Handling, Export/Import/Reset

## Assumptions Presented

### Audio Architecture
| Assumption | Confidence | Evidence |
|------------|-----------|----------|
| Web Audio API procedural sounds, shared AudioContext | Confident | SPEC line 1012, Settings.audioEnabled exists |
| Mute button fixed outside screen sections | Likely | showScreen() hides all sections |

### Animations
| Assumption | Confidence | Evidence |
|------------|-----------|----------|
| Leaf-fall CSS animation replacing letter-float | Likely | Current animation is simple translateY |
| Stardust via CSS pseudo-elements | Likely | Pure CSS, no JS needed |

### Export/Import
| Assumption | Confidence | Evidence |
|------------|-----------|----------|
| JSON export of progress + settings, no blobs | Likely | SPEC: "ohne Bild-Blobs" |

### Responsive + Error
| Assumption | Confidence | Evidence |
|------------|-----------|----------|
| @media max-width 700px, global error handler | Confident | Zero media queries currently |

## Corrections Made

No corrections — all assumptions confirmed.

## External Research Flagged

- Web Speech API German voice availability on Linux
- AudioContext auto-play policy compliance