Evidence intake: a new fragment fills the record's Context slot 720 × 360 scene, 8 seconds. A "New evidence" source box sits left; a Record box titled "Record" with Definition, Context and Sources rows sits right. A corridor arrow leaves the source box and points into the Record's left edge at the Context row. A small highlight chip leaves the source at 1s, travels the corridor, and stops at the Record's edge at 2.4s; between 2.4s and 2.8s the Record's empty Context slot fills with the highlight color behind its black label and stays filled through 8s. Definition's slot is filled from the start; Sources' slot stays empty. Base markup is the complete final state; animation starts on document load and does not loop. Evidence intake A new fragment of evidence fills the record's Context slot. New evidence Record Definition Context Sources

Still-first preview: the scene opens on its final state; no autoplay.