Color Palette for Construction/Architecture. Primary: #64748B (on-primary: #FFFFFF). Secondary: #94A3B8 (on-secondary: #0F172A). Accent: #EA580C (on-accent: #FFFFFF). Background: #F8FAFC. Foreground: #334155. Card: #FFFFFF (card-foreground: #334155). Muted: #EBF0F5 (muted-foreground: #64748B). Border: #E2E8F0. Destructive: #DC2626 (on-destructive: #FFFFFF). Ring: #64748B. Notes: Industrial grey + safety orange [Accent adjusted from #F97316 for WCAG 3:1].