#developmentDetail .development-list {
  margin-top: 96px;
}
#developmentDetail .development-item {
  position: relative;
  grid-template-columns: 100px 1fr;
  gap: 24px 48px;
}
#developmentDetail .development-item + .development-item {
  margin-top: 48px;
}
#developmentDetail .development-item:before {
  content: "";
  display: block;
  position: absolute;
  background: #7bb8d5;
  width: 2px;
  top: 78px;
  bottom: -50px;
  left: 50px;
  transform: scaleY(0);
  transform-origin: center top;
  transition: transform 0.7s 0.18s ease;
}
#developmentDetail .development-item:first-of-type:before {
  top: -48px;
}
#developmentDetail .development-item:first-of-type:after {
  content: "";
  display: block;
  position: absolute;
  width: 11px;
  height: 11px;
  border-radius: 1000px;
  background: #7bb8d5;
  top: -53px;
  left: 51px;
  transform: translateX(-50%);
}
#developmentDetail .development-item:last-of-type:before {
  bottom: -48px;
}
#developmentDetail .development-item:last-of-type:after {
  content: "";
  display: block;
  position: absolute;
  width: 11px;
  height: 11px;
  border-right: 2px solid #7bb8d5;
  border-bottom: 2px solid #7bb8d5;
  bottom: -48px;
  left: 51px;
  opacity: 0;
  transform: translateX(-50%) rotate(45deg);
  transition: opacity 0.3s 0.85s ease;
}
#developmentDetail .development-item.move:before {
  transform: scaleY(1);
}
#developmentDetail .development-item.move:last-of-type:after {
  opacity: 1;
}
#developmentDetail .development-year {
  grid-column: 1;
  grid-row: 1;
  place-items: center;
  width: 100px;
  height: 100px;
  border-radius: 1000px;
  background: #7bb8d5;
  color: #fff;
  font-size: 2.4rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.02em;
  position: relative;
  z-index: 1;
}
#developmentDetail .development-box {
  grid-column: 2;
  grid-template-columns: 42.8% 1fr;
  gap: 32px;
  padding: 40px;
  background: #fff;
  position: relative;
}
#developmentDetail .development-box:first-of-type:before {
  content: "";
  display: block;
  position: absolute;
  top: 48px;
  left: -31px;
  width: 32px;
  height: 32px;
  background: #fff;
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}
#developmentDetail .development-box .ttl {
  margin-top: 0;
  color: #4180b1;
  font-size: 2rem;
}
#developmentDetail .development-box .txt {
  margin-top: 20px;
}

@media screen and (max-width: 767px) {
  #developmentDetail .development-item {
    grid-template-columns: 1fr;
    gap: 0;
  }
  #developmentDetail .development-item:before {
    left: 50%;
    transform: translateX(-50%) scaleY(0);
  }
  #developmentDetail .development-item:first-of-type:after {
    left: calc(50% + 1px);
    transform: translateX(-50%);
  }
  #developmentDetail .development-item:last-of-type:after {
    left: calc(50% + 1px);
    transform: translateX(-50%) rotate(45deg);
  }
  #developmentDetail .development-year {
    grid-column: 1;
    grid-row: auto;
    justify-self: center;
  }
  #developmentDetail .development-box {
    grid-column: 1;
    grid-template-columns: 1fr;
    padding: 32px 5.8%;
    margin-top: 48px;
  }
  #developmentDetail .development-box:first-of-type:before {
    top: -32px;
    left: 34%;
    background: #fff;
    clip-path: polygon(100% 0, 100% 100%, 0 100%);
  }
  #developmentDetail .development-box + .development-box {
    margin-top: 24px;
  }
}