#download_nav {
  padding-bottom: 55px;
  padding-top: 35px;
}
#download_nav ul {
  display: flex;
  flex-wrap: wrap;
  -webkit-justify-content: center;
  justify-content: center;
}
#download_nav ul li {
  padding: 0 40px;
}
#download_nav ul li a {
  background: url(../image/download/arrow.svg) center bottom no-repeat;
  background-size: 16px auto;
  display: block;
  padding-bottom: 30px;
}
#download_nav ul li img {
  height: 12px;
  width: auto;
}

.download_area {
  margin: -80px auto 0;
  max-width: 1010px;
  padding: 115px 0 85px;
}
.download_area h3 {
  padding-bottom: 65px;
  text-align: center;
}
.download_area h3 img {
  height: 28px;
  width: auto;
}
.download_area h4 {
  padding: 60px 0 35px;
  text-align: center;
}
.download_area h3 + h4 {
  padding-top: 10px;
}
.download_area ul {
  display: flex;
  flex-wrap: wrap;
  -webkit-justify-content: center;
  justify-content: center;
}
.download_area ul.margin {
  margin-bottom: 30px;
}
.download_area ul li {
  margin-left: 40px;
  width: 170px;
}
.download_area ul.three_flex li:nth-child(3n + 1) {
  margin-left: 0;
}
.download_area ul.five_flex {
  justify-content: center;
}
.download_area ul.five_flex li:nth-child(5n + 1) {
  margin-left: 0;
}
.download_area .download_box a:hover .mask {
  opacity: 1;
}
.download_area .download_box a:hover .mask .caption {
  margin-top: 0;
}
.download_area .download_box .txt {
  color: #343434;
  font-size: 14px;
  font-size: 1.4rem;
  padding-top: 8px;
  text-align: center;
}
.download_area .download_box .cover {
  height: 170px;
  position: relative;
  width: 170px;
}
.download_area .download_box .cover .img_wrap {
  height: 100%;
  position: relative;
  width: 100%;
}
.download_area .download_box .cover .img_wrap img {
  height: auto;
  left: 50%;
  position: absolute;
  top: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  width: 100%;
}
.download_area .download_box .cover .img_wrap img.height_fix {
  height: 100%;
  max-width: inherit;
  width: auto;
}
.download_area .download_box .cover .mask {
  background-color: rgba(0, 0, 0, 0.8);
  height: 100%;
  left: 0;
  opacity: 0;
  position: absolute;
  top: 0;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
  width: 100%;
}
.download_area .download_box .cover .mask .caption {
  color: #fff;
  left: 0;
  margin-top: -20px;
  position: absolute;
  text-align: center;
  top: 50%;
  -webkit-transform: translate(0%, -50%);
  transform: translate(0%, -50%);
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
  width: 100%;
}
.download_area .download_box .cover .mask .caption i {
  display: block;
}

@media screen and (max-width: 768px) {
  #download_nav {
    padding: 35px 10px 40px;
  }
  #download_nav ul {
    display: flex;
    flex-wrap: wrap;
    font-size: 0;
    -webkit-justify-content: center;
    justify-content: center;
  }
  #download_nav ul li {
    border-right: 1px solid #ddd;
    margin-bottom: 35px;
    padding: 0 0;
    text-align: center;
    width: 33.333%;
  }
  #download_nav ul li:first-child,
  #download_nav ul li:nth-child(4) {
    border-left: 1px solid #ddd;
  }
  #download_nav ul li a {
    background: url(../image/download/arrow.svg) center bottom no-repeat;
    background-size: 13px auto;
    padding-bottom: 22px;
    padding-top: 6px;
  }
  #download_nav ul li img {
    height: 10px;
    width: auto;
  }
  .download_area {
    padding: 115px 35px 30px;
  }
  .download_area h3 {
    padding-bottom: 60px;
  }
  .download_area h3 img {
    height: 18px;
    width: auto;
  }
  .download_area h4 {
    padding: 30px 0 35px;
  }
  .download_area h4 img {
    height: 14px;
  }
  .download_area h3 + h4 {
    padding-top: 10px;
  }
  .download_area ul {
    display: flex;
    flex-wrap: wrap;
    -webkit-justify-content: start;
    justify-content: start;
  }
  .download_area ul li {
    margin-bottom: 35px;
    margin-left: 30px;
    width: calc(50% - 15px);
  }
  .download_area ul li:nth-child(2n + 1) {
    margin-left: 0 !important;
  }
  .download_area ul.three_flex li:nth-child(3n + 1) {
    margin-left: 30px;
  }
  .download_area ul.five_flex li:nth-child(5n + 1) {
    margin-left: 30px;
  }
  .download_area .download_box a:hover .mask {
    opacity: 1;
  }
  .download_area .download_box a:hover .mask .caption {
    margin-top: 0;
  }
  .download_area .download_box .txt {
    font-size: 11px;
    font-size: 1.1rem;
    padding-top: 4px;
  }
  .download_area .download_box .cover {
    width: 100%;
  }
  .download_area .download_box .cover .mask .caption {
    margin-top: -10px;
  }
  .download_area .download_box .cover .mask .caption i img {
    width: 20px;
  }
}