Utilize the plum-lime palette effectively by applying plum (#6A0DAD) to headers and navigation elements for a strong contrast. Use lime (#C7EA46) for key metrics to draw attention, ensuring a contrast ratio of at least 4.5:1 for accessibility.

Implement a 12-column grid system for a 16:9 ratio. Place KPI cards at the top for immediate visibility, with charts in the middle for analysis, ensuring 16-24px padding and 16-20px gaps between cards for clarity.

Title font size should be 24-28px bold, section headers at 18-20px semibold, card titles at 14-16px medium, and body text at 12-14px regular. Consistency is key; choose a single font family like Inter or Segoe UI.

Select chart types that match the data: use Gauge Charts for CAC, Multi-Line Charts for trends, and Donut Charts for proportions. Limit color usage to 5-7 distinct colors per chart for clarity, and ensure clear legends are positioned outside the chart area.

Create a visual hierarchy by making the most important metrics larger and bolder. Use whitespace effectively to separate sections and add subtle shadows to cards for depth. Highlight anomalies with conditional formatting to draw attention.

Incorporate hover states for interactive elements, such as changing opacity to 0.8. Include loading skeletons during data refreshes and provide visual feedback on filter selections to improve user experience.