.header {
  padding: 0px 10px 0px 10px;
  display: flex;
  height: 80px;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.logo {
  border: 1px solid #ddd;
  border-radius: 8px;
}

.header-left {
  display: flex;
  flex: 0 0 auto; /* 两侧不伸缩，保持内容宽度 */
  flex-direction: row;
  justify-content: space-around;
  align-items: center;
}

.header-center {
  display: flex;
  flex: 1; /* 中间部分占据剩余空间 */
  flex-direction: row;
  justify-content: space-evenly;
  align-items: center;
}

.header-right {
  display: flex;
  flex: 0 0 auto; /* 两侧不伸缩，保持内容宽度 */
  flex-direction: row;
  justify-content: space-around;
  align-items: center;
}

.header-right-btn {
  margin-left: 10px; 
  text-decoration: none; 
  color:black;
  padding: 10px;
}

.header-right-btn:hover {
  background-color: #e5e5e5;
}

.menu {
  color: black;
  font-size: 18px;
  font-weight: bold;
  cursor: pointer;
  text-decoration: none;
}


.pc-dropdown {
  position: relative;
  display: inline-block;
  z-index: 200;
}

/* 下拉内容初始隐藏 */
.pc-dropdown-content {
  display: none;
  position: absolute;
  background-color: #ffffff;
  font-size: 16px;
  font-weight: lighter;
  min-width: 200px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

/* 下拉菜单项样式 */
.pc-dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.pc-dropdown-content a.selected {
  color: black;
  font-weight: bold;
  font-size: 18px;
}


/* 鼠标悬停时改变按钮文字颜色 */
.menu:hover {
  color: #3e8eff; /* 改变字体颜色 */
  transition: color 0.3s ease; /* 添加颜色过渡效果 */
  text-decoration: underline;
}

/* 鼠标悬停时显示下拉菜单 */
.menu:hover .pc-dropdown-content {
  display: block;
}

/* 下拉菜单项悬停效果 */
.pc-dropdown-content a:hover {
  color: #3e8eff;
}




/**************** 手机端的下拉框效果 **************/
.dropdown {
  position: relative;
  display: inline-block;
  z-index: 200;
}

.dropdown-content {
  display: none;
  position: absolute;
  right: -30px;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-content a.selected {
  background-color: #e5e5e5;
}

.dropdown-content a:hover {
  background-color: #f1f1f1;
}

.dropdown:hover .dropdown-content {
  display: block;
}

.dropdown:hover .dropbtn {
  background-color: #e5e5e5; 
}

/******************首页的下拉样式****************/

.dropdown-home-content {
  display: none;
  position: absolute;
  padding: 20px 0px 20px 0px;
  background-color: #2e3030;
  min-width: 160px;
  z-index: 1;
  border: 1px solid #ccc;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.dropdown-home-content a {
  color: #c5c7c6;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

.dropdown-home-content a.selected {
  color: #e0ffef;
  font-weight: bold;
  font-size: 18px;
}

.dropdown-home-content a:hover {
  background-color: #47494a;
}

.dropdown:hover .dropdown-home-content {
  display: block;
}

.divider {
  height: 1px; /* 设置高度为1像素 */
  background-color: #47494a; /* 设置背景颜色为黑色 */
  margin: 5px auto; /* 设置上下外边距 */
  width: 80%;
}

.copyright {
  color: #888888;
  font-size: 12px;
  padding-left: 16px;
}



/* 默认隐藏搜索框 */
.search-container {
  display: none;
}


/* 当屏幕宽度大于768px时 */
@media (min-width: 768px) {
  .mobi-only {
    display: none;
  }

  .search-container {
    display: block;
    max-width: 500px;
    min-width: 300px;
    /* margin: 0 auto;
    padding: 16px; */
  }

  .search-box {
    display: flex;
    width: 100%;
    border-radius: 8px;
    overflow: hidden;
  }

  .search-box input[type="text"] {
    flex-grow: 1;
    padding: 8px;
    border: none;
    outline: none;
    background-color: #f6f6f6;
  }

  .search-box button {
    padding: 8px;
    cursor: pointer;
    background-color: #f6f6f6;
    border: none;
    border-radius: 0 4px 4px 0;
    transition: background-color 0.3s;
  }

  .search-box button:hover {
    background-color: lightblue;
  }
}

/* for mobile */
@media (max-width: 768px) {
  .header-center {
    display: none;
  }
}