.project-sort {
  padding: 0 0 20px;
  border-bottom: rgba(255, 255, 255, 0.1) solid 1px;
  opacity: 0;
  -moz-transition: opacity 0.6s;
  -o-transition: opacity 0.6s;
  -webkit-transition: opacity 0.6s;
  transition: opacity 0.6s;
}
.project-sort.show {
  opacity: 1;
}
.project-sort a {
  position: relative;
  display: inline-block;
  font-size: 0.875rem;
  margin-right: 25px;
  margin-bottom: 10px;
  padding-left: 15px;
}
.project-sort a:before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  margin-top: -3px;
  width: 5px;
  height: 5px;
  border: rgba(255, 255, 255, 0.3) solid 1px;
  border-radius: 50%;
}
.project-sort a .tw {
  position: absolute;
  left: 15px;
  opacity: 0;
  white-space: nowrap;
}
.project-sort a:hover .en {
  opacity: 0;
}
.project-sort a:hover .tw {
  opacity: 1;
}
.project-sort a.active {
  color: #FFF;
}
.project-list {
  display: -ms-flexbox;
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
  padding-top: 25px;
  margin: 0 -15px;
}
.project-item {
  position: relative;
  display: block;
  width: calc(25% - 30px);
  margin: 0px 15px 60px;
}
.project-item:hover .project-img {
  -webkit-filter: grayscale(0);
  filter: grayscale(0);
}
.project-item:hover .btn-round {
  background: rgba(255, 255, 255, 0.1);
  color: #FFF;
}
.project-item:hover .btn-round span:first-child {
  margin-top: -30px;
}
.project-img {
  position: relative;
  -webkit-filter: grayscale(1);
  filter: grayscale(1);
}
.project-case {
  color: #FFF;
  font-size: 1rem;
  letter-spacing: 2px;
  margin: 20px 0;
}
.project-space {
  font-size: 0.675rem;
  color: #ccc;
  line-height: 30px;
}
.project-more {
  font-size: 0.675rem;
}

@media screen and (max-width: 1600px) {
  .project-item {
    width: calc(33.3333% - 30px);
  }
}
@media screen and (max-width: 1100px) {
  .project-item {
    width: calc(50% - 30px);
  }
  .project-case {
    bottom: 15px;
    left: 15px;
  }
}
@media screen and (max-width: 800px) {
  .project-list {
    margin: 0;
  }
  .project-item {
    width: 100%;
    margin: 0 0 40px;
  }
  .project-case {
    margin: 10px 0;
  }
  .project-more {
    bottom: 30px;
  }
}
@media screen and (max-width: 640px) {
  .project-sort {
    display: -ms-flexbox;
    display: flex;
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
  }
  .project-sort a {
    width: calc(50% - 40px);
    display: block;
  }
}
@media screen and (max-width: 400px) {
  .project-sort a {
    width: 100%;
    margin-right: 0;
  }
}