* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: #f7f7f7;
  color: #333;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

header {
  background: #fff;
  border-bottom: 1px solid #ddd;
  padding: 15px 0;
  position: relative;
  position: fixed;
  top: 0;          /* 距离顶部 0px */
  left: 0;         /* 距离左侧 0px */
  width: 100%;     /* 宽度占据整个屏幕 */
  z-index: 1000;   
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* 添加阴影 */
}

header .container {
  display: flex;
  justify-content: space-between; /* 保持Logo和导航菜单之间的距离 */
  align-items: center;
}

header .logo {
  flex: 1; /* 让Logo占据左侧空间 */
}

header .logo {
  flex-shrink: 0; /* 确保Logo不被压缩 */
}

header .logo img {
  max-width: 150px;
}

header nav {
  flex: 2; /* 让导航菜单占据右侧剩余空间 */
  text-align: right; /* 导航菜单内容靠右对齐 */
}

header nav ul {
  list-style: none;
  display: flex;
  justify-content: flex-end; /* 确保导航菜单项靠右对齐 */
  /* gap: 1%; */
}

header nav ul li {
  flex-shrink: 0; /* 保持菜单项不被压缩 */
}

header nav ul li a {
  text-decoration: none;
  color: #333;
  font-weight: bold;
  padding: 5px 10px;
}

header nav ul li a:hover {
  background-color: #f0f0f0;
  border-radius: 5px;
}

.header-toggle {
  display: none;
  font-size: 24px;
  cursor: pointer;
}

@media (max-width: 1000px) {
  header .container {
      flex-direction: row; /* 在小屏幕上保持Logo和菜单水平排列 */
  }

  header .logo {
      flex: none;
  }

  .header-toggle {
    display: block; /* 小屏幕上显示汉堡菜单 */
    position: absolute;
    right: 20px; /* 将按钮定位到右侧 */
  }
  header nav ul {
      flex-direction: column;
      position: absolute;
      top: 100%;
      right: 0;
      background-color: #fff;
      width: 100%;
      display: none;
      gap: 0;
      padding: 10px 0;
      border: 1px solid #ddd;
  }

  header nav ul li {
      text-align: center;
      margin: 5px 0;
  }

  .header-toggle {
      display: block;
  }

  header nav.active ul {
      display: flex;
  }
}