01A simulated lesson player
A chaptered player with a progress rail, an active-chapter list, a transcript pane synced to a chapter selector, locally saved notes and keyboard controls — a convincing learning surface, clearly framed as a preview, not a real video.
02Filterable course catalog
Nine fully-written courses across six tracks filter instantly by discipline, level and free-text search, with deterministic procedural cover art per course — no server, no stock photography.
03A learner dashboard
A seeded, deterministic dashboard with progress rings, a learning streak, a continue-learning card, certificates and next-up recommendations — the app half of a marketing-plus-app build.