* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
  }
  
  body {
    background-color: #f0f0f0;
    padding: 15px;
    color: #333;
    line-height: 1.5;
  }
  
  .container {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  }
  
  header {
    background-color: #4169e1;
    color: white;
    padding: 15px;
    border-radius: 5px 5px 0 0;
  }
  
  h1 {
    margin-bottom: 10px;
    font-size: 1.5rem;
  }
  
  h2 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: #444;
  }
  
  .token-container {
    margin-top: 10px;
  }
  
  input,
  textarea {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 3px;
    font-size: 1rem;
    margin-bottom: 10px;
  }
  
  main {
    padding: 15px;
  }
  
  .prompt-container,
  .result-container {
    margin-bottom: 15px;
  }
  
  label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
  }
  
  textarea {
    min-height: 100px;
    resize: vertical;
  }
  
  button {
    background-color: #4169e1;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 3px;
    cursor: pointer;
    display: block;
    margin-left: auto;
  }
  
  button:hover {
    background-color: #3a5fd9;
  }
  
  #result {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 3px;
    min-height: 100px;
    background-color: #fafafa;
  }
  
  .placeholder {
    color: #888;
    text-align: center;
    padding: 20px 0;
    font-style: italic;
  }
  
  .error {
    color: #d32f2f;
    background-color: #ffebee;
    padding: 10px;
    border-radius: 3px;
    margin-bottom: 10px;
  }
  
  .loading:after {
    content: "...";
  }
  
  @media (max-width: 600px) {
    body {
      padding: 5px;
    }
  
    .container {
      border-radius: 0;
    }
  }
  
  /* マークダウン表示領域のカスタマイズ */
  .markdown-body {
    padding: 15px;
    font-size: 16px;
  }
  
  /* GitHub Markdownとのカスタム統合 */
  .markdown-body .placeholder {
    color: #888;
    text-align: center;
    padding: 20px 0;
    font-style: italic;
    margin-bottom: 0;
  }