Here’s a refined color palette that maintains the cool tones you prefer while ensuring all colors are visually distinct and legible as text on both white and black backgrounds:

json
{
  "palette_name": "Cool Contrast Gradient",
  "colors": [
    {
      "name": "Medium Violet Red",
      "hex_code": "
                            
                            #C71585
                        "
    },
    {
      "name": "Slate Blue",
      "hex_code": "
                            
                            #6A5ACD
                        "
    },
    {
      "name": "Dodger Blue",
      "hex_code": "
                            
                            #1E90FF
                        "
    },
    {
      "name": "Medium Sea Green",
      "hex_code": "
                            
                            #3CB371
                        "
    },
    {
      "name": "Teal",
      "hex_code": "
                            
                            #008080
                        "
    },
    {
      "name": "Dark Cyan",
      "hex_code": "
                            
                            #008B8B
                        "
    },
    {
      "name": "Crimson",
      "hex_code": "
                            
                            #DC143C
                        "
    },
    {
      "name": "Royal Blue",
      "hex_code": "
                            
                            #4169E1
                        "
    }
  ]
}

Palette Description:
The “Cool Contrast Gradient” palette consists of 8 visually distinct colors that are perfect for text on both white and black backgrounds. It features a mix of cool purples, blues, greens, and a hint of red, ensuring legibility while also being aesthetically pleasing. This palette allows for smooth transitions in gradients while maintaining clarity and vibrancy.

Would you like to explore how to implement this palette into your design, or do you need further adjustments?