Create a violin plot to analyze net profit distribution by product size
for a fashion e-commerce business.

X-axis: product size  
Y-axis: net profit per order

Design and style requirements:
- Use a soft, modern color palette
- One distinct but muted color per size
- Semi-transparent violins to show density
- Show median and interquartile range clearly
- Light background with minimal grid lines
- Avoid heavy borders or labels

The goal is to compare not just average profit,
but the stability and risk of profitability across sizes.