body {
      margin: 0;
      font-family: Helvetica, sans-serif;
      background-color: #f4f4f4;
      font-size: 1.3em;
    }

    a {
      color: #000;
      text-decoration: none;
    }

    .header {
      background-color: #fff;
      box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.1);
      position: fixed;
        width:100%;
      z-index: 3;
      overflow: hidden;
      
    }

    .header ul {
      margin: 0;
      padding: 0;
      list-style: none;
      
      position: static; /* ✅ 不要加 relative */
    }

    .header li {
      position: relative;
    }

    .header li a {
      display: block;
      padding: 20px 20px;
      border-right: 1px solid #f4f4f4;
      font-size: 1.3em;
    }

    .header li a:hover,
    .header .menu-btn:hover {
      background-color: #f4f4f4;
    }

    .header .logo {
      display: inline;
      align-items: center;
      font-size: 2em;
      padding: 10px 20px;
      color: black;
      gap: 10px;
    }

    .header .logo img {
      height: 1.3em;
      width: auto;
    }

    .header .menu {
      clear: both;
      max-height: 0;
      transition: max-height 0.2s ease-out;
      
    }

    .header .menu-icon {
      cursor: pointer;
      float: right;
      padding: 28px 20px;
      user-select: none;
      transform: scale(1.3);
      transform-origin: top right;
    }

    .header .menu-icon .navicon {
      background: #333;
      display: block;
      height: 2px;
      position: relative;
      width: 18px;
      transition: background 0.2s ease-out;
    }

    .header .menu-icon .navicon:before,
    .header .menu-icon .navicon:after {
      content: '';
      background: #333;
      display: block;
      height: 100%;
      position: absolute;
      width: 100%;
      transition: all 0.2s ease-out;
    }

    .header .menu-icon .navicon:before {
      top: 5px;
    }

    .header .menu-icon .navicon:after {
      top: -5px;
    }

    .header .menu-btn {
      display: none;
    }

    .header .menu-btn:checked ~ .menu {
      max-height: 800px;
    }

    .header .menu-btn:checked ~ .menu-icon .navicon {
      background: transparent;
    }

    .header .menu-btn:checked ~ .menu-icon .navicon:before {
      transform: rotate(-45deg);
      top: 0;
    }

    .header .menu-btn:checked ~ .menu-icon .navicon:after {
      transform: rotate(45deg);
      top: 0;
    }

    /* 子選單樣式 */
    .submenu {
       display: none;
      position: relative;    
      background-color: white;
      list-style: none;
      padding: 0;
      margin: 0;
      top: 100%;
      width:100%;
      left: 0;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      z-index: 10;
    }

    .submenu li {
  display: block;  
      
}

.submenu li a {
  display: block;/* ✅ 填滿整個選項區域 */
  padding: 0;   
}

.dropdown.open > .submenu {
  display: block;

  
}
    .dropdown-toggle::after {
  content: '▼';
  font-size: 0.7em;
  margin-left: 5px;
  display: inline-block;
  transition: transform 0.2s ease;
}

/* 如果下拉展開，加旋轉動畫 */
.dropdown.open > .dropdown-toggle::after {
  transform: rotate(180deg); /* 讓箭頭向上 */
}
a.underline {
      text-decoration: underline;
}
  .container {
   display: flex;
  flex-direction: column;
  
}
         .self-introduction {
  background-color: #f8f8f8;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  margin-top:50px;
  
}
    .self-introduction h2 {
  color: #333;
  font-size: 24px;
  margin-bottom: 10px;
}

.self-introduction p {
  color: #666;
  font-size: 16px;
  margin-bottom: 15px;
}
   


 



    /* 桌面版樣式 */
    @media (min-width: 850px) {
      body {
    font-size: 1em;
  }

  .header li {
    float: left;
    position: relative; /* ✅ 必須有 */
  }

  .header .menu {
    clear: none;
    float: right;
    max-height: none;
  }

  .header .menu-icon {
    display: none;
  }
      .submenu {
      display: none;
      position: fixed;
      background-color: white;
      list-style: none;
      top: 100%; 
      padding: 0;
      margin: 0;
      left: 0;
      height:100%;    
      width: 0; 
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      z-index: 10;
    }

    .submenu li {
  display: block;  
      
}

.submenu li a {
  display: block;        /* ✅ 填滿整個選項區域 */
  padding: 0;
  white-space: nowrap;
 
}

.dropdown.open > .submenu {
  display: block;

  
}
        .container {
   display: flex;
  flex-direction: row;
          gap: 10px; /* 圖片間距 */
}
    
}
 
    /* 小螢幕時加強漢堡條 */
    @media (max-width: 849px) {
      .header .menu-icon .navicon,
      .header .menu-icon .navicon:before,
      .header .menu-icon .navicon:after {
        height: 3px;
        width: 24px;
      }

      .submenu {
        position: static;
        box-shadow: none;
      }
    }