.portfolio {
  display: -ms-flexbox;
  display: flex;
  -ms-flex-pack: center;
  justify-content: center;
  -ms-flex-align: center;
  align-items: center;
  z-index: 1;
  background: #fff url("../images/bg_2.jpg");
  background-size: cover;
  background-position: center center;
  overflow: hidden;
}
.portfolio .container {
  display: -ms-flexbox;
  display: flex;
  -ms-flex-pack: center;
  justify-content: center;
  -ms-flex-align: center;
  align-items: center;
  position: relative;
  z-index: 3;
  width: 80%;
  height: 100%;
}

.portfolio.current,
.portfolio.current-back,
.portfolio.previous,
.portfolio.previous-back {
  animation: Up 0.9s 0s both;
}

.portfolio.previous,
.portfolio.previous-back {
  animation: slideDown 0.9s 0.6s both;
  animation-play-state: paused;
}
.portfolio.current-back {
  animation: none;
}
.portfolio.previous-back {
  animation-play-state: running;
}

.portfolio_row {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  width: 95%;
}
.portfolio_row .portfolio_left {
  width: 30%;
}
.portfolio_row .portfolio_left .portfolio_title_caption {
  font-size: 28px;
  text-transform: uppercase;
  font-weight: bold;
  font-family: "Gadugi Bold";
  color: #000;
  position: relative;
}

.portfolio_row .portfolio_left .portfolio_title_caption::before {
  position: absolute;
  content: "";
  left: -30%;
  top: 6px;
  width: 100px;
  height: 3px;
  background-color: #000;
}
.portfolio_row .portfolio_left .portfolio_title {
  font-family: "Sigma";
  font-size: 5rem;
  transform: scale(160%, 1) !important;
  -webkit-transform: scale(160%, 1);
  -moz-transform: scale(160%, 1);
  -ms-transform: scale(160%, 1);
  -o-transform: scale(160%, 1);
  margin-left: 5.3vw;
  line-height: 1;
  margin-top: 15%;
  margin-bottom: 25%;
  color: #00a0e3;
}
.portfolio_row .portfolio_left .portfolio_title span {
  font-size: 2.5rem;
  display: block;
  margin-top: -10px;
  color: #000;
}
.portfolio_row .portfolio_left .view_all_btn {
  display: block;
}
.portfolio_row .portfolio_left .view_all_btn a {
  display: block;
  font-family: "Gadugi Bold";
  text-transform: uppercase;
  font-size: 30px;
  text-align: center;
  padding-bottom: 15px;
  color: #000;
  border-bottom: 6px solid #00a0e3;
}
.portfolio_row .portfolio_left .view_all_btn a:hover {
  color: #00a0e3;
}

.portfolio_row .portfolio_right {
  flex: 1;
  margin-left: 5%;
}
.portfolio_row .portfolio_right .portfolio_grid {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
}
.portfolio_row .portfolio_right .portfolio_grid .portfolio_grid_item {
  background-color: #a7a9ac;
  flex-basis: calc(50% - 30px);
  height: 270px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  position: relative;
}

.portfolio_grid_item:nth-child(1) {
  margin-right: 30px;
  margin-bottom: 32px;
}
.portfolio_grid_item:nth-child(2) {
  margin-right: 30px;
  margin-bottom: -35px;
}
.portfolio_grid_item:nth-child(3) {
  margin-left: 30px;
  margin-top: -35px;
}
.portfolio_grid_item:nth-child(4) {
  margin-left: 30px;
  margin-top: 30px;
}

.portfolio_grid_item:nth-child(4) span {
  display: block;
}
.portfolio_grid_item:nth-child(4) a {
  position: absolute;
  bottom: 0;
  right: 0;
  display: block;
  font-family: "Gadugi";
  font-size: 18px;
  padding: 10px 15px;
  color: #fff;
  background-color: #00a0e3;
}
.portfolio_grid_item:nth-child(4) a:hover {
  background-color: #000;
}

@media (min-width: 1921px) {
}

@media (max-width: 1680px) {
}

@media (max-width: 1366px) {
  .portfolio .container {
    width: 90%;
  }
  .portfolio_row .portfolio_left {
    width: 35%;
  }
  .portfolio_row .portfolio_left .portfolio_title {
    font-size: 3.5rem;
    margin-left: 7.4vw;
    margin-top: 10%;
    margin-bottom: 20%;
  }
  .portfolio_row .portfolio_left .portfolio_title_caption {
    font-size: 20px;
  }
  .portfolio_row .portfolio_left .portfolio_title_caption::before {
    left: -30%;
  }
  .portfolio_row .portfolio_right .portfolio_grid .portfolio_grid_item {
    height: 230px;
  }
  .portfolio_row .portfolio_left .view_all_btn a {
    font-size: 25px;
  }
}

@media (max-width: 1200px) {
  .portfolio .container {
    width: 95%;
  }
  .portfolio_row .portfolio_left {
    width: 35%;
  }
  .portfolio_row .portfolio_left .portfolio_title {
    font-size: 3.5rem;
    margin-left: 7.4vw;
  }
  .portfolio_row .portfolio_left .portfolio_title_caption {
    font-size: 20px;
  }
  .portfolio_row .portfolio_left .portfolio_title_caption::before {
    left: -38%;
  }
  .portfolio_row .portfolio_right .portfolio_grid .portfolio_grid_item {
    height: 230px;
  }
  .portfolio_row .portfolio_left .view_all_btn a {
    font-size: 25px;
  }
}

@media (max-width: 768px) {
  .portfolio {
    display: block;
  }
  .portfolio .container {
    width: 100%;
    flex-direction: column;
    /* justify-content: end;
    margin-bottom: 50px; */
  }
  .portfolio_row .portfolio_left,
  .portfolio_row .portfolio_right {
    flex-direction: column;
    width: 100%;
  }
  .portfolio_row .portfolio_right {
    flex: 1;
    margin-left: 0%;
  }
  .portfolio_row .portfolio_left .portfolio_title_caption {
    font-size: 16px;
    position: relative;
    padding-left: 30px;
  }
  .portfolio_row .portfolio_left .portfolio_title_caption::before {
    position: absolute;
    content: "";
    left: -13%;
    top: 6px;
    width: 100px;
    height: 3px;
    background-color: #000;
  }
  .portfolio_row .portfolio_left .portfolio_title {
    font-size: 2.5rem;
    margin-left: 25vw;
    margin-top: 5%;
    margin-bottom: 8%;
    color: #00a0e3;
  }

  .portfolio_row .portfolio_left .portfolio_title span {
    font-size: 1.8rem;
    display: block;
    margin-top: -10px;
    color: #000;
  }
  .portfolio_row .portfolio_left .view_all_btn {
    display: block;
  }
  .portfolio_row .portfolio_left .view_all_btn a {
    display: block;
    font-size: 20px;
    margin-bottom: 20px;
  }

  .portfolio_row .portfolio_right .portfolio_grid {
    display: flex;
    /* flex-flow: row nowrap; */
    justify-content: space-around;
  }
  .portfolio_row .portfolio_right .portfolio_grid .portfolio_grid_item {
    height: 200px;
    flex-basis: 50%;
    flex-basis: calc(50% - 15px);
    margin-bottom: 15px;
  }

  .portfolio_grid_item:nth-child(1) {
    margin: 0;
  }
  .portfolio_grid_item:nth-child(2) {
    margin: 0;
  }
  .portfolio_grid_item:nth-child(3) {
    margin: 0;
  }
  .portfolio_grid_item:nth-child(4) {
    margin: 0;
  }
  .portfolio_grid_item:nth-child(4) a {
    font-size: 14px;
  }
}
@media (max-width: 667px) {
  .portfolio_row .portfolio_left .portfolio_title_caption::before {
    position: absolute;
    content: "";
    left: -25%;
    top: 6px;
    width: 100px;
    height: 3px;
    background-color: #000;
  }

  .portfolio_row .portfolio_left .portfolio_title {
    font-size: 2.5rem;
    margin-left: 25vw;
    margin-top: 15%;
    margin-bottom: 10%;
    color: #00a0e3;
  }
}