flowchart TB Start["Student clicks Start
MicroSim loaded paused"]:::start P1["Pause after a normal run"]:::path P2["Switches tabs while running"]:::path P3["Pause under 250ms"]:::path P4["Walks away, Pause never clicked"]:::path E1["Emit ONE Experienced statement
duration = elapsed"]:::emit E2["visibilitychange fires → Visibility Change Flush
emit immediately"]:::emit E3["Emit nothing
mis-click"]:::none E4["Emit nothing
unclosed interval"]:::none Start --> P1 --> E1 Start --> P2 --> E2 Start --> P3 --> E3 Start --> P4 --> E4 classDef start fill:#37474f,stroke:#1c2529,color:#fff,font-size:12px classDef path fill:#8fd3c9,stroke:#3bab9d,color:#0c2f2b,font-size:12px classDef emit fill:#2a9d8f,stroke:#1f7a6f,color:#fff,font-size:12px classDef none fill:#8b9bb0,stroke:#5f6e82,color:#fff,font-size:12px linkStyle default stroke:#999,stroke-width:2px