时长与镜头：监控视角的可信度全靠"什么都不动"：固定机位、平光、噪点、时间戳。单条时长不够 30 秒时，拆成两条：第一条 0–15 秒（人进电梯、门关上），第二条用第一条的最后一帧作首帧，接着生成影子渗出到切黑；两条都保留"固定机位"那一句。

怎么填变量：[穿深色外套的男人] 可以换成"[拎外卖袋的女人]""[牵狗的老人]"；把电梯换成"[楼梯间的防火门]""[地下车库的车]"，影子从门底下 / 车底下出来，就是同一套路的新故事。

常见失败与调整：

• 模型自作主张加运镜或调色：把"不要电影感运镜"挪到第一句后面，并加"像真实物业监控截取的片段"。
• 黑影变成实体人：写"只有地面上的影子，没有任何立体的人形"。
• 人走进墙里：保留硬性要求那句，并把电梯写成"画面正中、占画面三分之一宽"。

改编自 @mehvishs25 发布、YouMind-OpenLab/awesome-seedance-2-prompts 收录的提示词，许可证 CC BY 4.0。

英文原版

仓库收录版本在结尾处被截断，以下为收录内容（中间时间轴有删节）：

Create a 30-second realistic fixed security-camera recording inside an ordinary apartment building hallway at night.

IMPORTANT: This is a SINGLE CONTINUOUS STATIC CAMERA SHOT. The camera never moves, never zooms, and never changes angle.

The hallway has an elevator clearly visible at the CENTER of the frame. The elevator has two clearly visible sliding doors. The man must walk directly toward the elevator doors, stop in front of them, enter the elevator through the open doors, and then the elevator doors must close.

Do NOT let the man walk into a wall. Do NOT change the hallway layout. Do NOT move the elevator. Do NOT introduce any other person.

VISUAL STYLE:
Authentic low-quality apartment CCTV footage. Fixed ceiling-mounted security camera. Wide 16:9 frame. Slight fisheye distortion. Low-light digital noise. Mild compression artifacts. Flat fluorescent hallway lighting. Small timestamp in the corner. No cinematic camera movement. No dramatic color grading. No horror-film effects.

TIMELINE:
0–7 seconds: The hallway is completely ordinary and empty. A man enters the frame from the far end and casually walks toward the elevator in the CENTER of the hallway. His normal human shadow is clearly visible on the floor beneath and behind him.
7–12 seconds: The man reaches the elevator. The elevator doors OPEN clearly. The man walks through the OPEN elevator doorway and stands INSIDE the elevator. He is completely visible inside the elevator. The elevator doors then CLOSE completely.
12–16 seconds: The hallway is empty. ... Nothing happens for a few seconds.
16–20 seconds: A subtle anomaly begins. A dark human-shaped shadow slowly appears from underneath the CLOSED elevator doors. There is NO PERSON outside creating this shadow. ...
20–25 seconds: The detached shadow continues moving away from the elevator across the floor. It moves like the shadow of a person walking, even though there is NO PERSON anywhere in the hallway. ...
25–30 seconds: The detached shadow reaches the middle of the hallway. It suddenly stops. Hold on the empty hallway with the impossible shadow visible on the floor. Then abruptly CUT TO BLACK.

ABSOLUTE PRIORITIES:
1. The man MUST enter the elevator, not the wall.
2. The elevator must be clearly visible and centered.
3. The elevator doors must visibly OPEN before he enters.
4. The man must be completely INSIDE the elevator before the doors close.
5. The elevator doors must remain CLOSED while the detached shadow emerges.
6. The detached