/* 基本样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  list-style: none;
  text-decoration: none;
}
html {
  font-size: 16px; /* 默认字体大小 */
}
body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background: #f5f6f6;
}
.top {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 20px;
  background: #0053b1;
  color: #fff;
  border-bottom: 1px solid #61a1e9;
}
.top p {
  height: 30px;
  line-height: 30px;
}
.top p:nth-child(1) a {
  color: #fff;
}
.top p:nth-child(2) a {
  color: #fff;
}
.container {
  margin: 0 auto;
}

.menu-bar {
  background: #0053b1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 5%;
}

.logo {
  width: 100px;
  height: auto;
}

.menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
}

.menu > li {
  padding: 20px;
  position: relative; /* 添加相对定位，确保下拉菜单正确定位 */
}

.menu a {
  text-decoration: none;
  color: rgb(255, 255, 255);
  font-size: 1.125rem; /* 18px / 16px = 1.125rem */
}

.menu a:hover {
  color: #95dc09;
}

.dropdown-menu {
  display: none; /* 默认隐藏 */
  position: absolute;
  background-color: white;
  padding: 10px;
  margin-top: 5px; /* 微调间距 */
  border-radius: 5px;
  z-index: 999;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* 添加阴影增强视觉效果 */
  min-width: 160px; /* 设置最小宽度 */
}

.dropdown-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.dropdown-menu li {
  margin: 2px 0;
  padding: 10px;
}

.dropdown-menu a {
  color: rgb(0, 0, 0);
  font-size: 1rem; /* 16px / 16px = 1rem */
  display: block; /* 确保链接占据整个列表项宽度 */
  white-space: nowrap; /* 防止文本换行 */
}

.dropdown-menu a:hover {
  color: #95dc09; /* 悬停效果与父菜单一致 */
  background-color: #f8f8f8; /* 添加轻微的背景色变化 */
}

/* 通过JavaScript控制的显示状态 */
.dropdown-menu.open {
  display: block;
}

/* 删除或注释掉这行，避免与JavaScript交互冲突 */
.menu li:hover .dropdown-menu {
  display: block;
}

.banner-image {
  width: 100%;
  background: url(../assets/nbanner.jpg) no-repeat center center;
  background-size: cover;
  height: 300px;
  display: flex;
  align-items: center;
  color: #fff;
  font-size: 2rem;
  padding: 0 20px;
}
.banner-image p {
  width: 50%;
  height: 50%;
  font-size: 3.5rem;
  padding: 26px;
}
.menu-toggle {
  display: none;
}
.announcement {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  width: 100%;
  padding: 20px 10%;
}
.announcement-content {
  width: 100%;
  display: flex;
  align-items: center; /* 垂直居中 */
  justify-content: space-between; /* 水平居中 */
  background-color: #00acc2; /* 背景颜色 */
  color: #333; /* 文字颜色 */
  font-size: 1.5rem; /* 文字大小 */
  padding: 25px 80px;
  margin-bottom: 30px;
  color: #fff;
}
.announcement-content span {
  display: block;
  border: 1px solid #fff;
  padding: 10px 35px;
  font-size: 0.9rem;
  background: #00828f;
}
.announcement-content span:hover {
  background: #36bbcd;
}
.footer {
  width: 100%;
  font-size: 0.9rem;
  text-align: center;
  padding: 10px 0;
}
.footer p a {
  margin-left: 10px;
}
footer {
  background-color: #3b5070;
  color: white;
  padding: 40px 20px;
}

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

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.footer-column {
  flex: 1 1 200px;
  margin-bottom: 20px;
  padding: 0 10px;
}

.footer-column h3 {
  font-size: 18px;
  margin-bottom: 15px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  padding-bottom: 5px;
}

.footer-column ul {
  list-style-type: none;
}

.footer-column ul li {
  margin-bottom: 8px;
}

.footer-column ul li a {
  color: white;
  text-decoration: none;
  transition: color 0.3s ease;
  display: block;
  padding: 5px 0;
}

.footer-column ul li a:hover {
  color: #abc1ff;
}

.footer-qr {
  text-align: center;
  margin-top: 30px;
}

.footer-qr img {
  width: 120px;
  border-radius: 8px;
  background-color: white;
  padding: 5px;
}

.footer-qr p {
  margin-top: 10px;
  font-size: 14px;
}

/* 移动端样式 */
@media (max-width: 768px) {
  .announcement {
    padding: 20px 0;
  }
  html {
    font-size: 14px; /* 调整移动端的默认字体大小 */
  }
  .footer-links {
    flex-direction: column;
  }

  .footer-column {
    flex: 1 1 auto;
    margin-bottom: 15px;
    padding: 0;
  }

  .footer-column h3 {
    font-size: 16px;
    margin-bottom: 10px;
    cursor: pointer;

    /* 添加展开/折叠图标 */
    position: relative;
    padding-right: 20px;
  }

  .footer-column h3::after {
    content: "+";
    position: absolute;
    right: 0;
    top: 0;
    transition: transform 0.3s ease;
  }

  /* 移动端默认折叠菜单 */
  .footer-column ul {
    display: none;
    padding-left: 10px;
  }

  /* 当菜单展开时 */
  .footer-column.active h3::after {
    transform: rotate(45deg);
  }

  .footer-column.active ul {
    display: block;
  }

  .footer-qr {
    margin-top: 20px;
  }

  .footer-qr img {
    width: 100px;
  }

  .menu {
    display: none;
    flex-direction: column;
    background-color: white;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: 1000;
    padding-top: 60px; /* 为汉堡图标留出空间 */
  }

  .menu li {
    margin: 10px 0;
    text-align: center;
  }
  .menu li:hover .dropdown-menu {
    display: block;
  }

  .menu a {
    display: block;
    padding: 10px;
    font-size: 1.2rem; /* 16px / 14px ≈ 1.143rem */
  }

  .menu-toggle {
    display: block;
    background: none;
    border: none;
    cursor: pointer;
    color: rgb(8, 8, 8);
    font-size: 1.714rem; /* 24px / 14px ≈ 1.714rem */
  }
  .menu-toggle .bar {
    width: 25px;
    height: 3px;
    background-color: rgb(14, 6, 6);
    margin: 5px 0;
    display: block;
    z-index: 100;
  }

  .menu.active {
    margin-top: 80px;
    display: flex;
    background: #0053b1;
  }

  @media (max-width: 768px) {
    .dropdown-menu {
      position: static;
      width: 100%;
    }
  }
  .banner-image {
    height: 100px;
  }
  .banner-image p {
    font-size: 1.5rem;
    padding: 10px;
  }

  .announcement-content {
    flex-direction: column;
  }
  .announcement-content p {
    font-size: 1rem;
    margin-bottom: 10px;
  }
  .announcement-content span {
    font-size: 0.8rem;
  }
}