[
  {
    "id": 1,
    "level": 1,
    "name": "L1: Tractable",
    "description": "Problems that may be within reach with current techniques. Reserved for future additions.",
    "color_class": "text-green-600 bg-green-50 border-green-200"
  },
  {
    "id": 2,
    "level": 2,
    "name": "L2: Intermediate",
    "description": "Challenging problems requiring solid mathematical background. Reserved for future additions.",
    "color_class": "text-blue-600 bg-blue-50 border-blue-200"
  },
  {
    "id": 3,
    "level": 3,
    "name": "L3: Advanced",
    "description": "Difficult problems requiring specialized knowledge and sophisticated techniques.",
    "color_class": "text-yellow-600 bg-yellow-50 border-yellow-200"
  },
  {
    "id": 4,
    "level": 4,
    "name": "L4: Expert",
    "description": "Very challenging problems at the frontier of mathematical research.",
    "color_class": "text-red-600 bg-red-50 border-red-200"
  },
  {
    "id": 5,
    "level": 5,
    "name": "L5: Millennium Prize",
    "description": "Millennium Prize Problems and problems of equivalent difficulty.",
    "color_class": "text-purple-600 bg-purple-50 border-purple-200"
  }
]