科幻取消提示音

Short descending sci-fi UI cancel blip, 120 ms. Same steel-plate click family as the confirm tick, but the pitch falls about 20 percent and the 110 Hz sub-thump is present at a normal level, ending in a short 200 Hz filtered noise puff. Clearly audible, normal loudness, full presence. Feels like a latch releasing. Dry, cold, mechanical. No reverb, no musical melody.