.nav {
  width: 100%;
  height: 90px;
  border-top: solid 1px #eeeeee;
  box-sizing: border-box;
  background-color: #ffffff;
  position: fixed;
  top: 40px;
  transition: top 0.3s;
  z-index: 999;
}

.nav > .nav_box {
  max-width: 1300px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav > .nav_box > a {
  width: 161px;
}

.nav > .nav_box > a > .logo {
  width: 161px;
}

.nav > .nav_box > .nav_box_right {
  display: flex;
  align-items: center;
}

.nav > .nav_box > .nav_box_right > .nav_box_right_item {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 15px;
  color: #555555;
}

.nav > .nav_box > .nav_box_right > .nav_box_right_item:hover > div {
  color: #ff4000;
}

.nav > .nav_box > .nav_box_right > .nav_box_right_item:last-child {
  margin-right: 0;
}

.nav > .nav_box > .nav_box_right > span {
  display: block;
  color: #555555;
  margin: 0 20px;
}