Life-Support Standards Compliance Envelope — 2D Gauge & Timeline View

This is the 2D companion to the 3D compliance-envelope scene: the same first-order cabin mass-balance model driven by crew size, scrubber efficiency, O2 generator output and leak rate, and the same three overlapping agency standards — NASA-STD-3001, ESA's ECSS series and the ISS Multilateral operating limits. Instead of a rendered 3D box intersection, each of the cabin's three tracked parameters (CO2, O2, total pressure) gets its own horizontal gauge showing every enabled standard's allowable band stacked as colored zones, with a white outline marking the harmonized band their intersection defines. A live marker on each gauge shows whether that single parameter is inside its harmonized band, and a scrolling strip beneath the gauges traces the overall pass/fail history across mission time. Toggle standards, push the hardware toward failure, and watch exactly which parameter breaks first.