Here’s a dark-themed color palette designed for data visualization, incorporating all the specified elements and variations of colors.

json
{
  "palette_name": "Dark Data Visualization",
  "colors": [
    {
      "name": "Text Color",
      "hex_code": "
          
          #E0E0E0
       "
    },
    {
      "name": "Background",
      "hex_code": "
          
          #1C1C1C
       "
    },
    {
      "name": "App Accent Color",
      "hex_code": "
          
          #FF5722
       "
    },
    {
      "name": "Good/Active",
      "hex_code": "
          
          #4CAF50
       "
    },
    {
      "name": "Good/Active Variation",
      "hex_code": "
          
          #66BB6A
       "
    },
    {
      "name": "Spare",
      "hex_code": "
          
          #FFEB3B
       "
    },
    {
      "name": "Spare Variation",
      "hex_code": "
          
          #FFCA28
       "
    },
    {
      "name": "Caution (Close to Depletion)",
      "hex_code": "
          
          #FFA726
       "
    },
    {
      "name": "Caution Variation",
      "hex_code": "
          
          #FF9800
       "
    },
    {
      "name": "Alert (Even Closer)",
      "hex_code": "
          
          #FF3D00
       "
    },
    {
      "name": "Alert Variation",
      "hex_code": "
          
          #D50000
       "
    },
    {
      "name": "High Alert (Depleted)",
      "hex_code": "
          
          #B71C1C
       "
    },
    {
      "name": "High Alert Variation",
      "hex_code": "
          
          #F44336
       "
    }
  ]
}

This palette provides a range of colors that can be used effectively in a dark-themed data visualization environment. The variations ensure you have options for highlighting different states or levels of urgency.

Would you like any additional details or modifications to this palette?