Utilize the graphite-lime palette effectively by using graphite (#3D3D3D) for backgrounds and headers, lime (#AEEA00) for key metrics, and maintaining a 4.5:1 contrast ratio for accessibility.

Adopt a 12-column grid system for the 4:3 ratio layout. Position KPIs at the top for visibility, charts in the center for analysis, and filters on the sidebar. Use 16px padding and 20px gaps between sections.

Establish a clear typography hierarchy: Dashboard title at 28px bold, section headers at 20px semibold, card titles at 16px medium, and body text at 14px regular for readability.

Choose chart types that fit the data narrative: use the Gauge Chart for CAC, Scatter Plot to visualize CTR across channels, and Funnel Chart for lead conversion. Limit chart colors to 5 for clarity.

Create a clear visual hierarchy by emphasizing the most critical metrics with larger fonts and bold styles. Use whitespace effectively to separate sections and apply conditional formatting for anomalies.

Implement hover states with subtle opacity changes for interactive elements, and provide loading indicators during data refresh. Ensure intuitive navigation for drilling into detailed views.