休闲像素循环BGM

- **正向生成提示词**：loopable casual pixel game BGM, 30 seconds per loop, light and relaxing rhythm, office leisure atmosphere, soft 8-bit electronic timbre, gentle melody, seamless infinite loop, cheerful but not noisy, no heavy percussion, no vocals, suitable for idle office worker game, copyright-free - **反向避雷词**：intense music, fast pace, dramatic, orchestral, vocal, copyrighted melody, heavy bass