.ltbox {
  position: fixed;
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
  z-index: 99;
  background: rgba(0, 0, 0, 0.8);
  overflow-y: auto;
  display: none;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

.ltbox img {
  max-width: 100%;
  width: expression(document.body.clientWidth>100? "100%": "auto");
  overflow: hidden;
}

.ltbox ul,
.ltbox li {
  list-style: none;
  padding: 0;
  margin: 0;
}

.lttb {
  width: 80%;
  margin: 0 auto;
  max-width: 1600px;
  position: relative;
}

@media screen and (max-width: 960px) {
  .ltbox {
    display: none;
  }
  .lttb {
    width: 100%;
    top: 0;
  }
}

#nb-series-intro {
  font-family: "DINPro-Regular";
  color: #fff;
  font-size: 20px;
}

#nb-series-intro .lttb {
  border: #333 1px solid;
  position: relative;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  background: #000;
}

#nb-series-intro .lttb-close {
  position: absolute;
  width: 60px;
  height: 60px;
  background: url(https://storage-asset.msi.com/global/picture/nb/nb-series-intro/close.svg)
    center center no-repeat;
  background-size: cover;
  background-color: #2a2a2a;
  top: 0;
  right: 0;
  z-index: 10;
  cursor: pointer;
}

#nb-series-intro .lttb-close:hover {
  background-color: #f00;
}

#nb-series-intro .trianglebox {
  -webkit-box-flex: 0;
  -ms-flex: 0 0 50%;
  flex: 0 0 50%;
}

#nb-series-intro .imgbox {
  margin: 5% auto;
  width: 85%;
  position: relative;
}

#nb-series-intro .icon li {
  position: absolute;
  width: 30%;
  cursor: pointer;
  opacity: 0.2;
  text-align: center;
  padding: 10px 0;
}

#nb-series-intro .icon li img {
  height: 40px;
}

#nb-series-intro .icon li:hover,
#nb-series-intro .icon li.on {
  opacity: 1;
  -webkit-filter: saturate(5.5);
}

#nb-series-intro .icon li:nth-child(1) {
  top: 23%;
  left: 35%;
}

#nb-series-intro .icon li:nth-child(2) {
  top: 45%;
  left: 22%;
}

#nb-series-intro .icon li:nth-child(3) {
  bottom: 3%;
  left: 13%;
}

#nb-series-intro .icon li:nth-child(4) {
  top: 45%;
  right: 23%;
}

#nb-series-intro .icon li:nth-child(5) {
  bottom: 8%;
  right: 14%;
}

#nb-series-intro .icon li:nth-child(6) {
  top: 56%;
  right: 19%;
}
#nb-series-intro .icon li:nth-child(7) {
  bottom: 13%;
  left: 13%;
}

#nb-series-intro ul.txt {
  font-size: 100%;
}

#nb-series-intro ul.txt li {
  position: absolute;
  color: #f00;
  width: 25%;
  text-align: center;
}

#nb-series-intro ul.txt li:nth-child(1) {
  top: 16%;
  left: 37.5%;
}

#nb-series-intro ul.txt li:nth-child(2) {
  width: 21%;
  top: 38%;
  left: 28%;
}

#nb-series-intro ul.txt li:nth-child(3) {
  width: 21%;
  top: 38%;
  left: 48%;
}
#nb-series-intro ul.txt li:nth-child(4) {
  width: 21%;
  top: 70%;
  left: 21%;
}

#nb-series-intro ul.txt li:nth-child(5) {
  width: 21%;
  top: 70%;
  left: 58%;
}

#nb-series-intro .subtitle {
  display: none;
  background: #000;
  text-align: center;
  padding: 15px;
  font-size: 28px;
  color: #f00;
}

#nb-series-intro .subtab {
  text-align: center;
  display: none;
  background: #000;
  padding: 15px;
  font-size: 24px;
  border-bottom: rgba(255, 0, 0, 0.5) 1px solid;
  cursor: pointer;
  color: rgba(255, 0, 0, 0.5);
}

#nb-series-intro h4 {
  color: #f00;
  border-bottom: #f00 1px solid;
  display: inline-block;
  font-size: 1em;
}

#nb-series-intro .series {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: end;
  -ms-flex-align: end;
  align-items: flex-end;
  padding: 35px 0 25px;
  font-size: 1.3em;
}

#nb-series-intro .series img {
  height: 45px;
  margin-right: 15px;
}

#nb-series-intro .series span {
  line-height: 1;
}

#nb-series-intro p {
  color: #999;
  line-height: 2;
}

#nb-series-intro .bt {
  border-bottom: #535353 1px solid;
  padding-bottom: 50px;
  display: none;
}

#nb-series-intro .bt a {
  display: inline-block;
  border: #f00 1px solid;
  color: #fff;
  padding: 5px 15px;
  border-radius: 5px;
  background: #333;
  -webkit-transition: 0.5s all 0.5s ease;
  -o-transition: 0.5s all 0.5s ease;
  transition: 0.5s all 0.5s ease;
  text-decoration: none;
}

#nb-series-intro .bt a:hover {
  background: #f00;
  text-decoration: none;
}

#nb-series-intro .introbox {
  -webkit-box-flex: 0;
  -ms-flex: 0 0 48%;
  flex: 0 0 48%;
  background: url(https://storage-asset.msi.com/global/picture/nb/nb-series-intro/nb-series-intro-bg.jpg)
    top left repeat;
  padding: 3%;
  /* margin-left: 2%; */
}

#nb-series-intro .intro-tab {
  display: none;
}

#nb-series-intro .intro-tab.on {
  display: block;
}

@media screen and (max-width: 1920px) {
  #nb-series-intro {
    font-weight: 18px;
  }
  #nb-series-intro p {
    line-height: 1.6;
  }
  #nb-series-intro .icon li img {
    height: 40px;
  }
}

@media screen and (max-width: 1680px) and (max-height: 1050px) {
  #nb-series-intro .icon li img {
    height: 30px;
  }
}

@media screen and (max-width: 1536px) {
  #nb-series-intro ul.txt {
    font-size: 14px;
  }
  #nb-series-intro .series {
    font-size: 1.1em;
  }
}

@media screen and (max-width: 960px) {
  #nb-series-intro .lttb {
    display: block;
    border: none;
    top: 0;
  }
  #nb-series-intro .trianglebox {
    display: none;
  }
  #nb-series-intro .introbox {
    margin-left: 0;
    padding: 0;
  }
  #nb-series-intro .txt {
    display: none;
  }
  #nb-series-intro .intro-tab {
    display: block;
  }
  #nb-series-intro .intro-tab.on .txt {
    display: block;
    padding: 8% 5%;
  }
  #nb-series-intro .intro-tab.on .subtab {
    border-top: #f00 1px solid;
    border-bottom: #f00 1px solid;
    color: #fff;
  }
  #nb-series-intro .intro-tab.on .bt {
    display: block;
  }
  #nb-series-intro .subtab,
  #nb-series-intro .subtitle {
    display: block;
  }
  #nb-series-intro .series img {
    height: 60px;
  }
}