header {
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  z-index: 90;
  background-color: #000;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 60px;
}

header.fixed {
  position: fixed;
  background: rgba(0, 0, 0, 0.1);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.1);
  transition: all .5s;
}

.header {
  width: 100%;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-around;
}

.header .logo {
  font-size: 28px;
  font-weight: bold;
  color: #dab40f;
}

.header .logo img {
  width: 108px;
  height: 43px;
}

.header>nav>ul {
  display: flex;
  list-style: none;
  height: 100%;
}

.header>nav {
  height: 100%;
}

.header>nav>ul>li {
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999999;
  height: 100%;
  font-size: 18px;
  font-family: PingFang SC;
  font-weight: 500;
  position: relative;
  white-space: nowrap;
}

.header>nav>ul>li>a:hover {
  background-color: #FFDD44;
  color: #000 !important;
  cursor: pointer;
}

.header>nav>ul>li a {
  text-decoration: none;
  color: #999;
  width: 100%;
  height: 100%;
  display: inline-block;
  line-height: 60px;
  padding: 0 36px;
}

.header>nav>ul>li.active a {
  background-color: #FFDD44;
  color: #000 !important;
}

.header>nav>ul>li.active::after {
  content: '';
  display: block;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-color: #FFDD44;
}

.header .operation {
  font-size: 14px;
  color: #999999;
  cursor: pointer;
  display: flex;
  align-items: center;
  white-space: nowrap;
  position: relative;
}

.header .operation img {
  margin-right: 5px;
  margin-top: 3px;
  transition: all .3s;
}

.operation:hover .operation-menu {
  opacity: 1;
}

.operation:hover img {
  transform: rotate(180deg);
}

.operation .operation-menu {
  position: absolute;
  top: 33px;
  background-color: white;
  box-shadow: 0 0 6px #ccc;
  opacity: 0;
  transition: all .3s;
  border-radius: 3px;
  overflow: hidden;
}

.operation .operation-menu .operation-menu-item {
  padding: 10px 20px;
  display: block;
  color: #000;
  text-decoration: none;
}

.operation .operation-menu .operation-menu-item:hover {
  background-color: rgba(255, 221, 68, 0.1);
  color: var(--primary-color);
}

@media screen and (max-width: 1380px) {
  .header {
    padding: 0 3% !important;
  }
}

@media screen and (max-width: 1893px) {
  .header {
    padding: 0 10%;
  }
}

@media screen and (min-width: 1893px) {
  .header {
    padding: 0 20%;
  }
}