body {
    font-family: "Hiragino Sans", "Noto Sans JP", sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.8;
    margin: 0;
    padding: 0;
  }
  header {
    background: linear-gradient(to right, #3b82f6, #60a5fa);
    color: #fff;
    text-align: center;
    padding: 60px 20px;
  }
  header h1 {
    margin: 0;
    font-size: 2em;
    letter-spacing: 1px;
  }
  main {
    max-width: 880px;
    margin: 40px auto;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    overflow: hidden;
  }
  section {
    padding: 40px 50px;
    border-bottom: 1px solid #eee;
  }
  section:last-child {
    border-bottom: none;
  }
  section h2 {
    color: #333;
    border-left: 4px solid #3b82f6;
    padding-left: 10px;
    margin-bottom: 20px;
  }
  section p {
    margin: 10px 0;
  }
  ul {
    padding-left: 20px;
  }
  figure {
    text-align: center;
    margin: 25px 0;
  }
  figure img {
    width: 90%;
    max-width: 700px;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  }
  footer {
    background-color: #f1f3f5;
    text-align: center;
    color: #666;
    font-size: 0.9em;
    padding: 30px 0;
  }
  footer a {
    color: #3b82f6;
    text-decoration: none;
    margin: 0 10px;
  }
  footer a:hover {
    text-decoration: underline;
  }