body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: #f9f9f9;
    color: #333;
    /* line-height: 1.6; */
  }
  
  header {
    background: #0074D9;
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  
  .site-title {
    font-size: 1.2rem;
  }
  
  .nav-bar {
    background: #0074D9;
    display: none; /* スマホサイズでは非表示 */
    justify-content: space-around;
    align-items: center;
  }
  
  .nav-link {
    background: #0074D9;
    padding: 0.75rem 1rem;
    display: flex;
    white-space: nowrap;
    color: white;
    text-decoration: none;
    max-width: 100%;
    overflow: hidden;
    justify-content: center;
    align-items: center;
    flex: 1;
    text-align: center;
  }
  
  .hamburger {
    font-size: 1.5rem;
    cursor: pointer;
  }
  
  .card {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    border-radius: 8px;
  }
  
  .card h2 {
    color: #0074D9;
    margin-top: 0;
    margin-bottom: 1rem;
    font-size: 1.3rem;
    border-left: 4px solid #0074D9;
    padding-left: 1rem;
  }
  
  .card p, .card ul {
    margin-bottom: 1rem;
    text-align: justify;
  }
  
  .btn {
    display: inline-block;
    background: #0074D9;
    color: #fff;
    padding: 0.75rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: background 0.2s;
    margin: 2rem auto 0 auto;
    text-align: center;
  }
  .btn:hover {
    background: #005fa3;
  }
  
  footer {
    text-align: center;
    padding: 1rem;
    font-size: 0.9rem;
    background: #eee;
    color: #555;
  }
  
  /* スマホサイズ時はハンバーガー表示 */
  .hamburger {
    font-size: 1.5rem;
    cursor: pointer;
    display: block;
  }
  
  /* ハンバーガーメニューとして開いたときの表示 */
  .nav-bar.open {
    display: flex;
    flex-direction: column;
    background: #0074D9;
    position: absolute;
    top: 60px;
    left: 0;
    width: 200px;
    z-index: 1000;
  }
  
  /* PCサイズでは常に表示（ハンバーガーは非表示） */
  @media (min-width: 768px) {
    .nav-bar {
      display: flex !important;
      position: static;
      background: none;
    }
  
    .hamburger {
      display: none;
    }
  
    .nav-link {
      padding: 0.75rem 1rem;
      display: block;
      white-space: nowrap;
      color: white;
      text-decoration: none;
    }
    .card {
      margin: 2rem auto;
      padding: 2rem;
    }
  }
  
  @media (max-width: 768px) {
    .card {
      margin: 1rem;
      padding: 1rem;
    }
    .card h2 {
      font-size: 1.1rem;
    }
    .btn {
      width: 100%;
      padding: 1rem 0;
    }
  }
  
  .example-box {
    background: #eaf6ff;
    border-left: 5px solid #0074D9;
    border-radius: 6px;
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: #222;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    /* display: flex; */
    align-items: flex-start;
    gap: 0.5em;
    font-size: 1.05em;
  }
  .example-box strong {
    font-style: normal;
    color: #0074D9;
  }
  .example-box::before {
    content: '';
  }
  
  /* プロフィール画像のスタイル */
  .profile-image-container {
    display: flex;
    justify-content: center;
    margin: 1.5rem 0;
  }
  
  .profile-image {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid #FCF4DE;
    box-shadow: 0 4px 12px rgba(0, 116, 217, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  
  .profile-image:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(0, 116, 217, 0.3);
  }
  
  /* スマホサイズでの調整 */
  @media (max-width: 768px) {
    .profile-image {
      width: 120px;
      height: 120px;
    }
  }