Color Palette for Online Course/E-learning. Primary: #0D9488 (on-primary: #FFFFFF). Secondary: #2DD4BF (on-secondary: #0F172A). Accent: #EA580C (on-accent: #FFFFFF). Background: #F0FDFA. Foreground: #134E4A. Card: #FFFFFF (card-foreground: #134E4A). Muted: #E8F1F4 (muted-foreground: #64748B). Border: #5EEAD4. Destructive: #DC2626 (on-destructive: #FFFFFF). Ring: #0D9488. Notes: Progress teal + achievement orange [Accent adjusted from #F97316 for WCAG 3:1].