時長與鏡頭：監控視角的可信度全靠"什麼都不動"：固定機位、平光、噪點、時間戳。單條時長不夠 30 秒時，拆成兩條：第一條 0–15 秒（人進電梯、門關上），第二條用第一條的最後一幀作首幀，接着生成影子滲出到切黑；兩條都保留"固定機位"那一句。

怎麼填變量：[穿深色外套的男人] 可以換成"[拎外賣袋的女人]""[牽狗的老人]"；把電梯換成"[樓梯間的防火門]""[地下車庫的車]"，影子從門底下 / 車底下出來，就是同一套路的新故事。

常見失敗與調整：

• 模型自作主張加運鏡或調色：把"不要電影感運鏡"挪到第一句後面，並加"像真實物業監控截取的片段"。
• 黑影變成實體人：寫"只有地面上的影子，沒有任何立體的人形"。
• 人走進牆裏：保留硬性要求那句，並把電梯寫成"畫面正中、佔畫面三分之一寬"。

改編自 @mehvishs25 發佈、YouMind-OpenLab/awesome-seedance-2-prompts 收錄的提示詞，許可證 CC BY 4.0。

英文原版

倉庫收錄版本在結尾處被截斷，以下為收錄內容（中間時間軸有刪節）：

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