Marathon Race Tracker Spectator App Runner Splits

Design marathon race tracker spectator app runner splits with practical UI structure, meaningful controls, and polished live sports event visual language. Show runner split cards, course map, estimated arrival, cheer points, weather note, and finish alerts. Include runner split cards, course map, arrival estimate, cheer points, and finish alerts while keeping the product useful for spectators following runners. Give the screen believable labels, real microcopy, clear empty and loading states, and accessible contrast. Use spacing, grouping, and interaction cues that make the interface feel ready for a real product team, not just a decorative mockup. Keep the composition balanced between the main task area and supporting details, with enough data density for serious evaluation.