.about-us {
    padding: 130px 0;
}
.about-us .item:first-child {
    max-width: 1432px;
    margin: 0 auto;
    padding: 0 40px;
    box-sizing: content-box;
}
.about-us .item:last-child {
    background: #F4F4F4;
    margin-top: 130px;
}
.about-us .row {
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
}
.about-us .info {
    width: 50%;
    text-align: center;
}
.about-us .img-box {
    width: 50%;
    overflow: hidden;
}
.about-us img {
    width: 100%;
    transition: all 1s;
}
.about-us .title {
    font-size: 80px;
    line-height: 1.1;
    font-weight: bold;
}

@media (min-width: 1200px) {
    .about-us .img-box:hover img {
        transform: scale(1.08);
    }
}
.about-us .subtitle {
    font-size: 25px;
    margin: 16px auto;
    max-width: 380px;
}
.about-us .tips {
    font-size: 15px;
    max-width: 410px;
    margin: 0 auto;
}
.floor1-container {
    position: relative;
}
.floor1-container img {
    width: 100%;
}
.floor1-container .logo-mask {
    width: 100%;
    height: 50%;
    position: absolute;
    top: 0;
    background-color: #fff;
    transition: transform .4s cubic-bezier(.37,0,.63,1),color .4s cubic-bezier(.37,0,.63,1);
}
.floor1-container .logo-mask.pack-up {
    transform: translateY(-100%);
}
.floor1-container .logo-mask img {
    position: absolute;
    bottom: 50px;
}
  @media (max-width: 1200px) {
    .about-us .title {
      font-size: 45px;
    }
    .about-us .tips {
      font-size: 13px;
      max-width: 280px;
    }
  }
  @media (max-width: 767px) {
    .about-us {
      padding: 0 0 10px;
    }
    .about-us .row {
      display: block;
      position: relative;
    }
    .about-us .item:first-child {
        max-width: 100%;
        padding: 0;
    }
    .about-us .item:last-child {
        margin-top: 10px;
    }
    .about-us .img-box {
      width: 100%;
    }
    .about-us .info {
      width: auto;
      position: absolute;
      left: 16px;
      right: 16px;
      bottom: 30px;
      background: rgba(255,255,255,0.6);
      border-radius: 3px 3px 3px 3px;
      padding: 48px 24px;
    }
    .about-us .subtitle {
      font-size: 20px;
    }
    .about-us .tips {
      max-width: 236px;
    }
    .about-us .title {
        font-size: 36px;
    }
    .floor1-container .logo-mask {
        height: 40%;
    }
  }