You will submit a CSV where each row corresponds to one question ID and contains: (a) free‑text answer, and (b) a JSON field encoding the grounded steps with (video_id, start_time, end_time).

Primary metric. A grounding‑first composite: Kaggle‑MTGS (temporal grounding) and Kaggle‑STEM (step sequence alignment), inspired by the paper’s MTGS/STEM.