body {
    font-family: Arial, sans-serif;
    background-color: #1E1E1E;
    color: #ECECEC;
    margin: 0;
    padding: 0;
  }
  
  header {
    background-color: #121212;
    padding: 20px;
    text-align: center;
    color: #ECECEC;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
  }
  
  header img {
    height: 50px;
    vertical-align: middle;
  }
  
  header nav {
    display: inline-block;
    margin-left: 20px;
    vertical-align: middle;
  }
  
  header nav a {
    color: #ECECEC;
    text-decoration: none;
    margin: 0 15px;
    position: relative;
  }
  
  header nav a:hover {
    color: #BBBBBB;
  }
  
  header nav a:hover::after {
    content: '';
    display: block;
    width: 100%;
    height: 2px;
    background-color: #ECECEC;
    position: absolute;
    bottom: -5px;
    left: 0;
    transition: width 0.3s;
  }
  
  #content {
    padding-top: 80px;
  }
  
  #generate-container {
    margin: 100px auto;
    width: 50%;
    text-align: center;
  }
  
  #generate-container input, #generate-container textarea {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #444;
    border-radius: 5px;
    background-color: #333;
    color: #ECECEC;
  }
  
  #generate-container button {
    background-color: #444;
    color: #ECECEC;
    border: none;
    padding: 10px 20px;
    margin: 10px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  #generate-container button:hover {
    background-color: #555;
  }
  
  #json-output textarea {
    width: 100%;
    height: 150px;
    padding: 10px;
    border: 1px solid #444;
    border-radius: 5px;
    background-color: #333;
    color: #ECECEC;
  }
  
  /* Responsive Design */
  @media (max-width: 768px) {
    #generate-container {
      width: 90%;
    }
  }