/* 全体のスタイル */
body {
    font-family: Arial, sans-serif;
    background-color: #f1f1f1;
    margin: 0;
    padding: 20px;
    text-align: center;
  }
  
  h1 {
    color: #333;
  }
  
  /* レベル選択 */
  #levelSelection {
    margin-bottom: 20px;
  }
  
  #levelSelection label {
    font-weight: bold;
  }
  
  #levelSelect {
    padding: 5px 10px;
    border-radius: 4px;
    border: 1px solid #ccc;
    margin-right: 10px;
  }
  
  #startButton {
    padding: 5px 10px;
    border-radius: 4px;
    border: none;
    background-color: #4caf50;
    color: white;
    cursor: pointer;
  }
  
  #startButton:hover {
    background-color: #45a049;
  }
  
  /* テストコンテナ */
  #testContainer {
    max-width: 600px;
    margin: 0 auto;
    background-color: #fff;
    border-radius: 4px;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  }
  
  /* 問題文 */
  #questionContainer {
    font-size: 20px;
    margin-bottom: 20px;
  }
  
  /* 選択肢 */
  #optionsContainer button {
    display: block;
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: none;
    background-color: #f1f1f1;
    color: #333;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  #optionsContainer button:hover {
    background-color: #e0e0e0;
  }
  
  /* 結果コンテナ */
  #resultContainer {
    margin-top: 20px;
    font-size: 16px;
  }
  
  #resultContainer p {
    margin-bottom: 10px;
  }
  
  #resultContainer button {
    margin-top: 10px;
    padding: 5px 10px;
    border-radius: 4px;
    border: none;
    background-color: #4caf50;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  #resultContainer button:first-of-type {
    margin-right: 10px;
  }
  
  #resultContainer button:hover {
    background-color: #45a049;
  }