/* introduce-s1 */
.introduce-s1 {
  padding-bottom: 0.4rem;
}

.introduce-s1-title {
  line-height: 1;
  margin-bottom: 0.2rem;
}

.introduce-s1-content {
  padding-top: 1;
  box-sizing: border-box;
  overflow: hidden;
  height: calc(100vh - 3rem);
}

.introduce-s1-content-item {
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 0.4rem 2rem;
  margin-bottom: 0.5rem;
}

.introduce-s1-content-item.active .introduce-s1-item-year::after {
  animation-name: bluebigfade;
  background-color: var(--theme-color);
}

.introduce-s1-content-item.active .introduce-s1-item-year::before {
  opacity: 1;
}

.introduce-s1-content-item.active .introduce-s1-item-year {
  color: var(--theme-color);
}

.introduce-s1-content-item.active .introduce-s1-item-right {
  opacity: 1;
}
@media (min-width: 768px) {
  .introduce-s1-content-item:hover .introduce-s1-item-year::after {
    animation-name: bluebigfade;
    background-color: var(--theme-color);
  }

  .introduce-s1-content-item:hover .introduce-s1-item-year::before {
    opacity: 1;
  }

  .introduce-s1-content-item:hover .introduce-s1-item-year {
    color: var(--theme-color);
  }

  .introduce-s1-content-item:hover .introduce-s1-item-right {
    opacity: 1;
  }
}
.introduce-s1-item-year {
  font-size: 24px;
  color: #666;
  line-height: 1;
  display: flex;
  align-items: center;
  position: relative;
  margin-top: 0.5em;
  transition: 1s;
  white-space: nowrap;
}
.introduce-s1-item-year-last::after {
  margin-left: calc(0.28rem + 6.73px) !important;
}
.introduce-s1-item-year::after {
  content: '';
  display: inline-block;
  width: max(0.1rem, 10px);
  height: max(0.1rem, 10px);
  border-radius: 50%;
  background: #666;
  margin-left: 0.28rem;
  animation: bigfade 3s ease-in-out infinite;
  transition: 1s;
}

@keyframes bigfade {
  0% {
    box-shadow: 0 0 0 0 rgba(102, 102, 102, 0.7);
  }
  50% {
    box-shadow: 0 0 3px 2px rgba(102, 102, 102, 0.7);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(102, 102, 102, 0.7);
  }
}

@keyframes bluebigfade {
  0% {
    box-shadow: 0 0 0 0 #1c92fa47;
  }
  50% {
    box-shadow: 0 0 3px 2px #1c93fa;
  }
  100% {
    box-shadow: 0 0 0 0 #1c92fa47;
  }
}

.introduce-s1-item-year::before {
  content: '';
  position: absolute;
  left: 100%;
  width: 1.22rem;
  height: max(0.04rem, 4px);
  background: linear-gradient(to right, #148ffa, transparent);
  opacity: 0;
  transition: 1s;
}

.introduce-s1-item-right {
  opacity: 0.5;
}

.introduce-s1-item-title {
  font-size: var(--font-size-24);
  color: #222;
  opacity: inherit;
  line-height: 1;
  transition: 1s;
}

.introduce-s1-item-title em {
  font-style: normal;
  font-size: var(--font-size-48);
  font-family: var(--font-regular);
  font-weight: 100;
  color: #666;
  opacity: inherit;
  line-height: 1;
  margin-right: 0.1rem;
  transition: 1s;
}

.introduce-s1-item-left {
  position: relative;
}

.introduce-s1-item-left::after {
  content: '';
  font-size: var(--font-size-24);
  position: absolute;
  top: 1em;
  right: max(0.04rem, 4px);
  width: 2px;
  height: calc(100% + 0.5rem + 7em);
  background-color: #666;
  z-index: -1;
}

.introduce-s1-item-text {
  margin-top: 0.1rem;
  transition: 1s;
}

.introduce-s1-gsap {
  height: fit-content;
}