/* ════════════════════════════════════════════════════════════════════════ PHM DIAGNOSTIC FLOW — VISUAL REFRESH LAYER Shared by all four diagnostic surfaces: diagnostic.html · diagnostic-url-readout.html · diagnostic-calibration.html · diagnostic-result-mockup.html Purpose: compose ON TOP of phm-design-system.css (v3.1) to unify the four pages into one product. No structural / JS changes — this layer only governs visual treatment. Loaded LAST in each , after the page's own