Color Palette:
1. Light Blue: 
                            
                            #ADD8E6
                         - A soft and calming blue for background
2. Dark Blue: 
                            
                            #4169E1
                         - A rich and deep blue for highlighting
3. Light Green: 
                            
                            #90EE90
                         - A fresh and vibrant green for positive data
4. Dark Green: 
                            
                            #008000
                         - A bold and strong green for contrast
5. Light Yellow: 
                            
                            #FFFFE0
                         - A gentle and warm yellow for emphasis
6. Dark Yellow: 
                            
                            #FFD700
                         - A bright and vivid yellow for visibility
7. Light Purple: 
                            
                            #E6E6FA
                         - A delicate and soothing purple for variety
8. Dark Purple: 
                            
                            #800080
                         - A royal and elegant purple for sophistication
9. Light Orange: 
                            
                            #FFDAB9
                         - A cheerful and energetic orange for attention
10. Dark Orange: 
                            
                            #FFA500
                         - A fiery and bold orange for impact
11. Light Gray: 
                            
                            #D3D3D3
                         - A neutral and versatile gray for balance
12. Dark Gray: 
                            
                            #A9A9A9
                         - A sleek and modern gray for contrast

Description: This color palette provides a range of accessible light and dark variants for line chart data visualization. The colors are carefully selected to ensure clarity, contrast, and visual appeal in presenting data effectively.