nav button {
    margin-left: 10px;
    padding: 8px 16px;
    border: none;
    background-color: #ff6f61;
    color: white;
    border-radius: 5px;
    cursor: pointer;
  }
  
  .intro {
    padding: 2rem;
    text-align: center;
  }
  
   /*ヘッダー*/
   .site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 24px;
    background-color: #fff;
    border-bottom: 1px solid #ddd;
    position: sticky;
    top: 0;
    z-index: 1000;
  }
  
  .logo a {
    font-size: 1.8rem;
    font-weight: bold;
    color: #333;
    text-decoration: none;
    font-family: 'Arial', sans-serif;
  }
  
  .site-nav > ul {
    display: flex;
    gap: 20px;
    list-style: none;
    margin: 0;
    padding: 0;
  }
  
  .site-nav a {
    text-decoration: none;
    color: #555;
    font-size: 1rem;
  }
  
  .site-nav a:hover {
    color: #f08080;
  }

  /* ▼ dropdown の親 */
.dropdown {
    position: relative;
  }
  
  /* ▼ メニューは初期は非表示 */
  .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: white;
    border: 1px solid #ccc;
    min-width: 165px;
    z-index: 10;
    list-style: none;
    padding: 0;
    margin: 0;
  }
  
  /* ▼ dropdown に hover したときだけ表示 */
  .dropdown:hover .dropdown-menu {
    display: block;
  }
  
  /* ▼ メニュー項目の見た目 */
  .dropdown-menu li {
    border-bottom: 1px solid #eee;
  }
  
  .dropdown-menu li a {
    display: block;
    padding: 10px;
    text-decoration: none;
    color: #333;
  }
  
  .dropdown-menu li a:hover {
    background-color: #f0f0f0;
  }
  .notification-bell {
    position: relative;
  }
  
  .notification-bell .badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: red;
    color: white;
    border-radius: 50%;
    font-size: 0.7em;
    padding: 2px 6px;
  }