.u_nav-wrapper {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: white;
  border-bottom: 1px #ccc solid;
  z-index: 10;
}
.u_nav {
  max-width: 1400px;
  margin: auto;
}
.u_nav-left {
  margin: 18px;
  font-size: 16px;
}
.u_nav-right {
  margin: 18px;
  font-size: 14px;
  position: relative;
  top: 3px;
  float: right;
  > a {
    margin-right: 20px;
  }
}
.u_nav-left,
.u_nav-input {
  float: left;
}
.u_nav-link {
  color: #777;
}
.u_nav-input,
.u_nav-btn {
  float: left;
  position: relative;
  height: 38px;
  top: 10px;
  padding: 5px;
  font-size: 16px;
  color: #777;
  border: 1px lightgray solid;
}
.u_nav-input {
  display: block;
  width: 200px;
  border-right: 0;
  border-radius: 3px 0 0 3px;
}

/* PC 端搜索框组 */
.u_nav-btn {
  font-size: 14px;
  display: block;
  width: 80px;
  text-align: center;
  cursor: pointer;
  line-height: 24px;
  vertical-align: middle;
  border-radius: 0 3px 3px 0;

  > ul {
    border: 0;
    > li {
      display: none;
    }
  }

  &:hover {
    border-bottom: 0;
    > ul {
      border: 1px lightgray solid;
      border-top: 0;
      border-radius: 0 0 3px 3px;
      > li {
        display: block;
      }
    }
  }
}
.u_nav-ul {
  position: relative;
  top: 7px;
  left: -6px;
  width: 80px;
  display: block;
  background-color: white;
  z-index: 5;
}
.u_nav-li {
  font-size: 14px;
  display: block;
  height: 35px;
  line-height: 30px;
  vertical-align: middle;
}

/* 移动端搜索框组 */
.um_nav-input-group {
  display: none;
}
@media (max-width: 1000px) {
  .u_nav-right,
  .u_nav-input-group {
    display: none;
  }
  .um_nav-input-group {
    display: block;
  }
  .um_nav-input,
  .um_nav-btn {
    display: block;
    height: 30px;
    margin-bottom: 10px;
    float: left;
    color: #777;
    padding: 5px;
    border: 1px lightgray solid;
  }
  .um_nav-input {
    margin-left: 15px;
    width: 130px;
    font-size: 12px;
    border-radius: 3px 0 0 3px;
  }
  .um_nav-btn {
    font-size: 12px;
    width: 50px;
    text-align: center;
    cursor: pointer;
    line-height: 20px;
    vertical-align: middle;
    border-left: 0;
    border-radius: 0;
  }
  .um_nav-btn:last-child {
    border-radius: 0 3px 3px 0;
  }
}