Security camera analysis. Focus: {focus_prompt}

PREVIOUS: {prev_description}

RESPOND IN EXACTLY THIS FORMAT (one line each, no extra text):
PRESENT: YES|NO
COUNT: <number or 0>
LOCATION: <brief, e.g. "center", "left door" or "-">
STATE: <brief, e.g. "standing", "walking" or "-">
ACTION: <brief, e.g. "entering", "leaving" or "-">
ALERT: YES|NO
REASON: <max 10 words if ALERT=YES, else "-">

RULES:
- If ONLY lighting/shadow changes: respond exactly "No significant changes."
- Be concise. No sentences. No explanations.
- ALERT=YES only if focus object detected AND doing something notable.
{custom_prompt}
