*{margin: 0;
padding: 0;
box-sizing: border-box;
}
ul,li{list-style: none;}
a{text-decoration: none;}
img{cursor: pointer;}
body{font: "微软雅黑";color: black;}
.nav{position: fixed;top: 0;left: 0;height: 60px;width: 100%;z-index: 9999;background: white;}
.nav-mian{display: flex; justify-content: space-between;width: 1400px;height: 60px;font-size: 24px;margin: 0 auto;}
.nav-logo {float: left;height: 60px; margin: 0 auto;}
.nav-logo img{height: 60px;}
.topmenu {
  display: flex;
  list-style: none;
}
.topmenu > li {
  position: relative; /* 关键点：二级菜单相对这个一级li定位 */
  margin-right:35px;
  margin-top: 10px;
  font-size:24px;
}
.topmenu > li > a{
  color:#000;
  text-decoration:none;
}
.topmenu > li > a:hover{
  color: darkgrey;
}

/* =====二级菜单样式===== */
.submenu {
  list-style: none;
  /* 默认隐藏 */
  display: none;
  position: absolute;
  left: 0;
  top: 100%; /* 紧贴一级菜单下方 */
  background:white ;
  width: 180px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  padding: 8px 6px;
}
.submenu li a {
  display: block;
  padding: 8px 14px;
  font-size: 20px;
  color:#333;
  text-decoration:none;
}
/* 二级选项hover高亮，和截图灰色效果一致 */
.submenu li a:hover {
  background-color:#FDD5DC;
}
/* 悬浮一级li，显示二级下拉菜单 */
.topmenu > li:hover .submenu{
  display:block;
}
.banner{width: 100%;height: 685px;margin-top: 60px;position: relative;overflow:hidden;}
.banner img{width: 100%;height: 685px;position: absolute;top:0;left:0;display: none;}
.banner img:nth-of-type(1){display: block;}
.one{margin: 80px auto;width: 1400px;height: 750px;position: relative;}
.one-span {margin: 80px auto;width: 150px;display: block;position: relative;}
.one-span h3:nth-of-type(2){position: absolute;right:-45px; width: 250px;}
.one-mian{width: 1400px;height: 600px;margin: 0 auto;display: flex;flex-wrap: nowrap;gap:20px}
.one-mian img{width: 320px;height: 420px;margin-top: 80px;transition: all 0.3s ease;}
.one-mian img:hover{transform: scale(1.1,1.1);border-radius: 12px;box-shadow: 0 8px 40px rgba(0,0,0,0.20);}
.one-mian img:nth-of-type(even){margin-top: 160px;}
.two-mian{width: 1100px;margin: 150px auto;display: flex;align-items: center;}
.two-mian .zuo{width:400px;margin-right: 0;}
.two-mian .zuo img{width:400px;margin-right: 0;height: 500px;}
.two-mian .you{height:500px;width:700px;background-image: url(../img/背景.png);background-repeat: no-repeat;background-size: cover;background-position: center;}
.two-mian .you h4{margin-left: 80px;margin-top: 100px;}
.two-mian .you p{width: 400px;height: 50px;line-height:2.2;margin-left: 80px;margin-top: 40px;}
.two-mian .you-mian{display: flex;flex-wrap: nowrap;gap:80px;}
.two-mian .you-mian img{width: 100px;height: 100px;border-radius: 50%;margin-top:150px;transition: all 0.3s ease;box-shadow: 0 8px 40px rgba(0,0,0,0.20);}
.two-mian .you-mian img:hover{transform: scale(1.1,1.1);}
.two-mian .you-mian img:nth-of-type(1){margin-left: 20px;}
footer div{width: 100%;height: 250px;background: #FDDFC4;display: flex;justify-content: center;align-items: center;}
footer p{width: 300px;text-align: center;margin-top: 40px;}