60-30-10 Rule

60% dominant color (usually background/neutral). 30% secondary color (headings, navigation). 10% accent color (CTA buttons, highlights).

A 益阳 client used 5 equal-area colors - looked like candy packaging. Refactored to 60-30-10 (white bg plus dark gray text plus blue accents) - immediately looked professional.

Color Psychology

Red: urgency, appetite. Orange: friendly, value. Yellow: optimism, attention. Green: nature, growth. Blue: trust, professionalism (most popular business color globally). Purple: mystery, premium. Black: luxury, authority.