.tabs {
  position: fixed;
  right: 0;
  bottom: 30px;
  background: rgba(0, 0, 0, 0.5);
  padding: 20px 45px 20px 25px;
  z-index: 99;
  border-radius: 15px 0 0 15px;
  color: #fff;
}

.tabs .tab-item {
  font-weight: bold;
  cursor: pointer;
  position: relative;
  transition: all .5s;
  padding: 20px 40px;
  text-align: center;
  border: 1px solid #474748;
  border-radius: 5px;
  background: rgba(44, 45, 47, 0.85);
}

.tabs .tab-item:first-child {
  margin-bottom: 10px;
}

.tabs .tab-item.active {
  background-color: red;
  border: 0;
}

.to-top-btn {
  bottom: 28%;
}

.main {
  width: 100%;
  min-height: 100vh;
}

.main .list-wrap {
  display: none;
  overflow: hidden;
  background: #000;
}

.main .list-wrap.active {
  display: block;
}

.main .item {
  float: left;
  width: 100%;
  animation: fadeInLeft .5s linear;
  -webkit-animation: fadeInLeft .5s linear;
}

.main .item:nth-child(7n+2) {
  width: 50%;
  animation: fadeInLeft .5s linear;
  -webkit-animation: fadeInLeft .5s linear;
}

.main .item:nth-child(7n+2) .item-wrap {
  padding-bottom: 56.15%;
}

.main .item:nth-child(7n+3) {
  width: 50%;
  animation: fadeInRight .5s linear;
  -webkit-animation: fadeInRight .5s linear;
}

.main .item:nth-child(7n+3) .item-wrap {
  padding-bottom: 56.32%;
}

.main .item:nth-child(7n) {
  width: 33.3%;
  animation: fadeInRight .5s linear;
  -webkit-animation: fadeInRight .5s linear;
}

.main .item:nth-child(7n) .item-wrap {
  padding-bottom: 56.32%;
}

.main .item:nth-child(7n-1) {
  width: 33.33%;
  animation: fadeInLeft .5s linear;
  -webkit-animation: fadeInLeft .5s linear;
}

.main .item:nth-child(7n-1) .item-wrap {
  padding-bottom: 56.32%;
}

.main .item:nth-child(7n-2) {
  width: 33.3%;
  animation: fadeInLeft .5s linear;
  -webkit-animation: fadeInLeft .5s linear;
}

.main .item:nth-child(7n-2) .item-wrap {
  padding-bottom: 56.32%;
}

.main .item:nth-child(7n-3) {
  width: 100%;
  animation: fadeInLeft .5s linear;
  -webkit-animation: fadeInLeft .5s linear;
}

.main .item .item-wrap {
  position: relative;
  width: 100%;
  padding-bottom: 52.08%;
  overflow: hidden;
}

.main .item .item-wrap:hover .img-wrap {
  transform: scale(1.05);
}

.main .item .img-wrap {
  position: absolute;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  transition: all 1s;
}

.main .item .mask {
  position: absolute;
  width: 100%;
  top: 50%;
  height: 50%;
  background-image: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.8));
  z-index: 1;
}

.main .item:nth-child(7n+2) .info-box, .main .item:nth-child(7n+3) .info-box, .main .item:nth-child(7n) .info-box, .main .item:nth-child(7n-1) .info-box, .main .item:nth-child(7n-2) .info-box {
  white-space: nowrap;
  position: absolute;
  z-index: 2;
  color: #fff;
  left: 25px;
  bottom: 25px;
  width: 80%;
}

.main .item:nth-child(7n+2) .info-box .item-title, .main .item:nth-child(7n+3) .info-box .item-title, .main .item:nth-child(7n) .info-box .item-title, .main .item:nth-child(7n-1) .info-box .item-title, .main .item:nth-child(7n-2) .info-box .item-title {
  font-size: 24px;
}

.main .item:nth-child(7n+2) .info-box .item-en-title, .main .item:nth-child(7n+3) .info-box .item-en-title, .main .item:nth-child(7n) .info-box .item-en-title, .main .item:nth-child(7n-1) .info-box .item-en-title, .main .item:nth-child(7n-2) .info-box .item-en-title {
  font-size: 18px;
}

.main .item:nth-child(7n+2) .info-box .link-wrap, .main .item:nth-child(7n+3) .info-box .link-wrap, .main .item:nth-child(7n) .info-box .link-wrap, .main .item:nth-child(7n-1) .info-box .link-wrap, .main .item:nth-child(7n-2) .info-box .link-wrap {
  margin-top: 20px;
}

.main .item .info-box {
  position: absolute;
  z-index: 2;
  color: #fff;
  bottom: 8%;
  width: 75%;
  left: 12.5%;
  white-space: nowrap;
}

.main .item .info-box .item-title {
  font-size: 40px;
  line-height: 1.5;
  max-width: 100%;
}

.main .item .info-box .item-en-title {
  margin-top: 0;
  max-width: 100%;
  font-size: 40px;
  line-height: 1.5;
}

.main .item .link-wrap {
  display: flex;
  margin-top: 40px;
  font-size: 18px;
  align-items: center;
  color: #fff;
}

.main .item .link-wrap:hover .more-icon {
  border-color: #d90600;
  background: #d90600;
}

.main .item .link-wrap .more-icon {
  transition: all .5s;
  border: 1px solid #fff;
  border-radius: 50%;
  width: 22px;
  height: 22px;
  line-height: 20px;
  text-align: center;
  margin-right: 10px;
}

.main .item .link-wrap .more-icon i {
  font-size: 14px;
  display: flex;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
}

@media all and (max-width: 1440px) {
  .tabs {
    padding: 15px 18px 15px 10px;
  }
  .tabs .tab-item {
    padding: 6px 12px;
  }
  .main .item:nth-child(7n+2) .info-box, .main .item:nth-child(7n+3) .info-box, .main .item:nth-child(7n) .info-box, .main .item:nth-child(7n-1) .info-box, .main .item:nth-child(7n-2) .info-box {
    left: 15px;
    bottom: 15px;
  }
  .main .item:nth-child(7n+2) .info-box .item-title, .main .item:nth-child(7n+3) .info-box .item-title, .main .item:nth-child(7n) .info-box .item-title, .main .item:nth-child(7n-1) .info-box .item-title, .main .item:nth-child(7n-2) .info-box .item-title {
    font-size: 22px;
  }
  .main .item:nth-child(7n+2) .info-box .item-en-title, .main .item:nth-child(7n+3) .info-box .item-en-title, .main .item:nth-child(7n) .info-box .item-en-title, .main .item:nth-child(7n-1) .info-box .item-en-title, .main .item:nth-child(7n-2) .info-box .item-en-title {
    font-size: 16px;
  }
  .main .item:nth-child(7n+2) .info-box .link-wrap, .main .item:nth-child(7n+3) .info-box .link-wrap, .main .item:nth-child(7n) .info-box .link-wrap, .main .item:nth-child(7n-1) .info-box .link-wrap, .main .item:nth-child(7n-2) .info-box .link-wrap {
    margin-top: 10px;
  }
  .main .item .info-box {
    left: 15px;
    bottom: 15px;
  }
  .main .item .info-box .item-title {
    font-size: 32px;
  }
  .main .item .info-box .item-en-title {
    font-size: 32px;
  }
  .main .item .info-box .link-wrap {
    margin-top: 10px;
  }
  .main .item .link-wrap {
    margin-top: 10px;
    font-size: 16px;
  }
  .main .item .link-wrap .more-icon {
    width: 20px;
    height: 20px;
    line-height: 18px;
    margin-right: 10px;
  }
}

@media all and (max-width: 768px) {
  .to-top-btn {
    bottom: 160px;
  }
  .main .item:nth-child(7n+2), .main .item:nth-child(7n+3), .main .item:nth-child(7n), .main .item:nth-child(7n-1), .main .item:nth-child(7n-2), .main .item:nth-child(7n-3) {
    width: 100%;
  }
  .main .item:nth-child(7n+2) .item-wrap, .main .item:nth-child(7n+3) .item-wrap, .main .item:nth-child(7n) .item-wrap, .main .item:nth-child(7n-1) .item-wrap, .main .item:nth-child(7n-2) .item-wrap, .main .item:nth-child(7n-3) .item-wrap {
    position: relative;
    width: 100%;
    padding-bottom: 52.08%;
  }
  .main .item:nth-child(7n+2) .info-box, .main .item:nth-child(7n+3) .info-box, .main .item:nth-child(7n) .info-box, .main .item:nth-child(7n-1) .info-box, .main .item:nth-child(7n-2) .info-box {
    width: 90%;
    left: 5%;
    bottom: 15px;
  }
  .main .item:nth-child(7n+2) .info-box .item-title, .main .item:nth-child(7n+3) .info-box .item-title, .main .item:nth-child(7n) .info-box .item-title, .main .item:nth-child(7n-1) .info-box .item-title, .main .item:nth-child(7n-2) .info-box .item-title {
    font-size: 16px;
  }
  .main .item:nth-child(7n+2) .info-box .item-en-title, .main .item:nth-child(7n+3) .info-box .item-en-title, .main .item:nth-child(7n) .info-box .item-en-title, .main .item:nth-child(7n-1) .info-box .item-en-title, .main .item:nth-child(7n-2) .info-box .item-en-title {
    font-size: 14px;
  }
  .main .item:nth-child(7n+2) .info-box .link-wrap, .main .item:nth-child(7n+3) .info-box .link-wrap, .main .item:nth-child(7n) .info-box .link-wrap, .main .item:nth-child(7n-1) .info-box .link-wrap, .main .item:nth-child(7n-2) .info-box .link-wrap {
    margin-top: 10px;
  }
  .main .item .info-box {
    width: 90%;
    left: 5%;
    bottom: 15px;
  }
  .main .item .info-box .item-title {
    font-size: 16px;
  }
  .main .item .info-box .item-en-title {
    font-size: 14px;
  }
  .main .item .info-box .link-wrap {
    margin-top: 10px;
  }
  .main .item .link-wrap {
    margin-top: 10px;
    font-size: 12px;
  }
  .main .item .link-wrap .more-icon {
    width: 18px;
    height: 18px;
    line-height: 18px;
    margin-right: 10px;
  }
  .main .item .link-wrap .more-icon i {
    display: block;
    transform: scale(0.8);
    transform-origin: center;
  }
}