Build a dashboard to compare advertising performance across channels (Facebook, Google, TikTok). For each channel, calculate Spend, Conversions, Revenue, ROAS, CPA, CTR, and CPC. Use multiple visualizations including KPI cards, bar charts, line charts, and a budget distribution chart to clearly show performance and trends over time. Apply a modern e-commerce style color palette with black, white, orange, and soft gray tones similar to leading e-commerce platforms. Based on the results, identify the best and worst performing channels and recommend where to increase or reduce budget.