# Implementation Plan: Frosted Glass Background Effect (REPAIR - TRUE GPU)

## Phase 1: Robust Shader & FBO Foundation
- [x] Task: Implement: Create `ShaderManager` methods for downsampled FBO setup (scene, temp, blur). [d9148ac]
- [x] Task: Implement: Develop the "Deep Sea" background shader and integrate it as the FBO source. [d85dc3a]
- [~] Task: Implement: Develop the 2-pass Gaussian blur shaders with a wide tap distribution.
- [ ] Task: Conductor - User Manual Verification 'Phase 1: Robust Foundation' (Protocol in workflow.md)

## Phase 2: High-Performance Blur Pipeline
- [ ] Task: Implement: Create the `prepare_global_blur` method that renders the background and blurs it at 1/4 resolution.
- [ ] Task: Implement: Ensure the pipeline correctly handles high-DPI scaling (`fb_scale`) for internal FBO dimensions.
- [ ] Task: Conductor - User Manual Verification 'Phase 2: High-Performance Pipeline' (Protocol in workflow.md)

## Phase 3: GUI Integration & Screen-Space Sampling
- [ ] Task: Implement: Update `_render_frosted_background` to perform normalized screen-space UV sampling.
- [ ] Task: Implement: Update `_begin_window` and `_end_window` to manage global transparency and call the blur renderer.
- [ ] Task: Implement: Apply the new window wrappers to all primary panels in `src/gui_2.py`.
- [ ] Task: Conductor - User Manual Verification 'Phase 3: GUI Integration' (Protocol in workflow.md)

## Phase 4: UI Tuning & Persistence
- [ ] Task: Implement: Add "Frosted Glass" tuning sliders to the Shader Editor.
- [ ] Task: Implement: Update `src/theme_2.py` to persist all frosted glass settings.
- [ ] Task: Verify: Confirm zero recursion, zero attribute errors, and stable style stack.
- [ ] Task: Conductor - User Manual Verification 'Phase 4: Final Polishing' (Protocol in workflow.md)