header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  min-width: 1200px;
  height: 63px;
  display: flex;
  align-items: center;
  transition: 0.5s;
}
header .nav {
  width: 1200px;
  margin: 0 auto;
  position: relative;
}
header .nav .logo a {
  display: block;
  width: 278px;
  height: 31px;
  background: url('../img/logo.png') no-repeat center;
  background-size: 100% 100%;
  font-size: 0;
  position: absolute;
  top: 15px;
  left: 0;
}
header .nav .btn .navList {
  width: 590px;
  height: 63px;
  margin-right: 25px;
}
header .nav .btn .navList .navItem {
  display: flex;
  align-items: center;
  position: relative;
  height: 100%;
  margin-left: 20px;
  cursor: pointer;
}
header .nav .btn .navList .navItem .navName {
  height: 36px;
  line-height: 36px;
  font-size: 14px;
  font-weight: 600;
  color: #FFFFFF;
}
header .nav .btn .navList .navItem .navItemList {
  display: none;
  position: absolute;
  left: 0;
  top: 63px;
  width: 84px;
  box-sizing: border-box;
  padding: 15px 0;
  background: #ffffff;
  box-shadow: 0px 3px 16px 0px rgba(176, 191, 199, 0.3);
}
header .nav .btn .navList .navItem .navItemList .li {
  width: 100%;
  height: 35px;
  line-height: 35px;
  text-align: center;
  font-size: 12px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #333333;
}
header .nav .btn .navList .navItem .navItemList .li:hover {
  color: #40C87F;
}
header .nav .btn .navList .navItem .navItemList::before {
  border-width: 7px;
  border-color: transparent transparent rgba(255, 255, 255, 0.8) transparent;
  border-style: dotted dotted solid dotted;
  left: 15px;
  position: absolute;
  bottom: 100%;
  content: "";
}
header .nav .btn .navList .navItem:hover .navItemList {
  display: block;
}
header .nav .btn .navList .active {
  border-bottom: 2px solid #ffffff;
}
header .nav .btn .phone {
  width: 160px;
  font-size: 22px;
  font-weight: bold;
  color: #FFFFFF;
  margin-left: 47px;
}