.have-son {
  display: block;
  position: relative;
}
.have-son::before {
  content: "";
  display: block;
}

.icon-box {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  width: 100%;
}
.icon-box .icon {
  -webkit-box-flex: 0;
      -ms-flex: none;
          flex: none;
}
.icon-box.col {
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
}

.hover-under-after {
  display: block;
  position: relative;
}
.hover-under-after::after {
  content: "";
  position: absolute;
  left: 50%;
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
  bottom: -5px;
  display: block;
  width: 0;
  height: 3px;
  background-image: linear-gradient(-78deg, #2c5c9b 0%, #4a78b3 53%, #2c5c9b 100%), linear-gradient(#0672c9, #0672c9);
  background-blend-mode: normal, normal;
  opacity: 0.9;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}
.hover-under-after:hover::after, .hover-under-after.active::after {
  width: 100%;
}

.header .m-nav-btn,
.header .nav .nav-close {
  display: none;
}

@media screen and (max-width: 768px) {
  .top,
  .header .search,
  .header .m-nav-btn,
  .header .nav .nav-close {
    display: none;
  }
  .header .floor {
    min-height: 14vmin;
  }
  .header .floor .logo img {
    height: 8vmin;
  }
  .header .floor .t-mall {
    margin-right: 14.3333333333vmin;
  }
  .header .floor .t-mall img {
    height: 8vmin;
  }
  .header .floor .t-mall a {
    margin-top: 0;
  }
  .header .floor .t-mall a .info {
    display: none;
  }
  .header .floor .nav {
    position: fixed;
    left: 0;
    top: 0;
    -webkit-transform: translateX(-100%);
            transform: translateX(-100%);
    -webkit-transition: all 0.5s;
    transition: all 0.5s;
    width: 100%;
    height: 100vh;
    z-index: 9999;
    background-color: #fff;
  }
  .header .floor .nav.active {
    -webkit-transform: translateX(0%);
            transform: translateX(0%);
  }
  .header .floor .nav .nav-close {
    display: block;
    position: absolute;
    right: 10px;
    top: 10px;
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
  }
  .header .floor .nav .nav-close span {
    font-size: 20px;
    color: #000;
  }
  .header .floor .nav ul {
    display: block;
    padding: 30px;
  }
  .header .floor .nav ul li a {
    font-weight: bolder;
    font-size: 16px;
  }
  .header .floor .nav ul li a::after {
    display: none;
  }
  .header .floor .nav ul li .sub-nav {
    padding: 5px 0;
    position: unset;
    left: auto;
    top: auto;
    -webkit-transform: translate(0);
            transform: translate(0);
    opacity: 1;
    visibility: visible;
    -webkit-box-shadow: none;
            box-shadow: none;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
        flex-wrap: wrap;
  }
  .header .floor .nav ul li .sub-nav a {
    display: block;
    width: 50%;
    font-weight: normal;
  }
  .header .floor .m-nav-btn {
    display: block;
    position: absolute;
    right: 2.6666666667vmin;
    top: 50%;
    -webkit-transform: translate(0, -50%);
            transform: translate(0, -50%);
    width: 10.6666666667vmin;
    height: 10.6666666667vmin;
    line-height: 10.6666666667vmin;
    text-align: center;
  }
  .header .floor .m-nav-btn span {
    font-size: 8vmin;
    color: #000;
  }
}