body {
    font-family: sans-serif;
    margin: 0;
    padding: 20px;
  }
  
  h1 {
    text-align: center;
    color: #333;
  }
  
  .playground {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 800px;
    margin: 0 auto;
    background-color: #f7f7f7;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  }
  
  @media (min-width: 768px) {
    .playground {
      flex-direction: row;
    }
    
    .input-section, .result-section {
      flex: 1;
    }
  }
  
  .input-section, .result-section {
    padding: 15px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  }
  
  select, input, button {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
  }
  
  button {
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
  }
  
  button:hover {
    background-color: #45a049;
  }
  
  #result {
    font-size: 24px;
    font-weight: bold;
    color: #333;
    margin: 20px 0;
    padding: 10px;
    background-color: #f0f0f0;
    border-radius: 4px;
    text-align: center;
  }
  
  #formula-code {
    font-family: monospace;
    background-color: #f5f5f5;
    padding: 10px;
    border-radius: 4px;
    overflow-x: auto;
  }
  
  .param-container {
    margin-bottom: 10px;
  }
  
  .param-label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
  }