body {
    font-family: "Meiryo", sans-serif;
    background-color: #fff;
    color: #333;
    padding: 40px 20px;
    max-width: 950px;
    margin: 0 auto;
    font-size: 18px;
    line-height: 1.8;
  }
  
  h1 {
    font-size: 32px;
    margin-bottom: 30px;
    border-bottom: 2px solid #444;
    padding-bottom: 10px;
    text-align: center;
  }
  
  table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
  }
  
  th, td {
    border: 1px solid #ccc;
    padding: 15px;
    text-align: left;
    vertical-align: top;
  }
  
  th {
    background: #f4f4f4;
    width: 30%;
  }
  
  .back-to-index {
    text-align: center;
    margin-top: 50px;
  }
  
  .back-to-index a {
    background-color: #007bff;
    color: #fff;
    padding: 10px 25px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 16px;
    transition: 0.3s ease;
  }
  
  .back-to-index a:hover {
    background-color: #0056b3;
  }
  
  @media screen and (max-width: 768px) {
    body {
      font-size: 18px;
      padding: 30px 15px;
      max-width: 800px;
    }
  
    h1 {
      font-size: 28px;
    }
  
    th, td {
      padding: 12px;
    }
  }