北极光延时（小屋灯光） prompt

Subject: a lone cabin with a single amber window and a snow-covered plain. Action: locked timelapse - the aurora emerges, first a pale green ribbon, then sheets of green and violet ripple across the sky, folding and expanding; stars are visible behind the curtains of light; a silhouetted figure steps out of the cabin and looks up; the timelapse slows to real time for the final five seconds. Scene: Iceland or northern Norway in winter. Light: black-blue sky base, cabin window amber practical, dancing aurora. Camera: locked tripod throughout, no movement. Style: photoreal nature timelapse, cinematic. Audio: complete silence except for a low ambient wind tone. Constraints: no watermark, no text, no extra figures, no warped horizon.