Softer background color, remove panel divider

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -17,7 +17,7 @@ See `docs/rg35xx-plus.md` for target device details, boot chain, and deployment.
 ```sh
 make                    # native build — uses pkg-config
 make clean              # remove build artifacts
-./build/sdlamp2 [audio_directory]
+./build/sdlamp2 audio   # run with the repo's audio directory
 ```
 
 Building for the arm64 target device via the Docker container (from the `docker-arm64/` directory):

docs/sdlamp2-fsd.md

@@ -43,6 +43,11 @@ This document specifies the functional requirements for an SDL2 based media play
 
 ## 6. Changelog
 
+### 2026-02-14 — Softer background, remove panel divider
+
+- **Background color**: Changed from white (`#FFFFFF`) to a soft gray (`#E8E8E8`) for a gentler appearance.
+- **Remove divider**: Removed the vertical separator line between the controls panel and the album art.
+
 ### 2026-02-14 — Fix residual audio on cassette switch
 
 - **Clear device queue on switch**: `switch_file()` now calls `SDL_ClearQueuedAudio()` after pausing the audio device, preventing a brief snippet of the previous cassette from playing when the new one starts.

src/sdlamp2.c

@@ -915,7 +915,7 @@ int main(int argc, char** argv) {
     }
 
     /* --- Rendering --- */
-    SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
+    SDL_SetRenderDrawColor(renderer, 0xE8, 0xE8, 0xE8, 0xFF);
     SDL_RenderClear(renderer);
 
     /* Album art (right panel, centered, aspect-preserving) */
@@ -949,10 +949,6 @@ int main(int argc, char** argv) {
       SDL_RenderFillRect(renderer, &fill);
     }
 
-    /* Separator line between left panel and right panel */
-    SDL_SetRenderDrawColor(renderer, 0xC0, 0xC0, 0xC0, 0xFF);
-    SDL_RenderDrawLine(renderer, 200, 10, 200, 470);
-
     /* Buttons */
     SDL_RenderCopy(renderer, controls_texture, &prev_sprite, &prev_btn);
     SDL_RenderCopy(renderer, controls_texture, &rewind_sprite, &rewind_btn);