5.4 Color palette exploration & contrast testing

I’m working on a project about [describe your domain/product/idea]. I want to explore color palettes for my design. Can you help me with: 1. Suggesting 3–4 possible palettes with primary, secondary, and accent colors. 2. Highlighting how each palette aligns with brand mood. 3. Testing for accessibility and contrast compliance (WCAG). 4. Suggesting rules for usage (when to use each color). Format output as palette sets with notes.