@import url("https://fonts.googleapis.com/css2?family=Barlow:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap");

*, *:before, *:after {
  box-sizing: border-box;
}
html {
  height: 100vh;
}
body {
  margin: 0;
  height: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: #f6f6f6;
}

#dummy_section {
  height: 50vh;
}

/* timeline section */
.timeline-animation-container {
  font-family: "Barlow", sans-serif;
  padding-block: 6rem;
}
.wrapper {
  max-width: 79.5rem;
  width: 100%;
  margin: 0 auto;
}

.timeline {
  position: relative;
  display: grid;
  gap: 12.5rem 11.4375rem ;
  place-content: center;
  grid-template-columns: 1fr 1fr;
}
.item {
  color: #bbbbbb;
  transition: 0.25s ease-in-out color;
  will-change: color;
}
.item.active {
  color: #344358;
  transition-duration: 0.075s;
}

.item:nth-child(1) { padding-block-start: 6rem; grid-column: 1; grid-row: 1; }
.item:nth-child(2) { grid-column: 2; grid-row: 2; }
.item:nth-child(3) { grid-column: 1; grid-row: 3; }
.item:nth-child(4) { grid-column: 2; grid-row: 4; }
.item:nth-child(5) { grid-column: 1; grid-row: 5; }
.item:nth-child(6) { grid-column: 2; grid-row: 6; }
.item:nth-child(7) { grid-column: 1; grid-row: 7; }
.item:nth-child(8) { grid-column: 2; grid-row: 8; }
.item:nth-child(9) { grid-column: 1; grid-row: 9; }
.item:nth-child(10) { grid-column: 2; grid-row: 10; }
.item:nth-child(11) { grid-column: 1; grid-row: 11; }
.item:nth-child(12) { grid-column: 2; grid-row: 12; }
.item:nth-child(13) { grid-column: 1; grid-row: 13; }
.item:nth-child(14) { padding-block-end: 6rem; grid-column: 2; grid-row: 14; }

.item:nth-child(2n+1) :is(.year, .desc) {
  text-align: right;
}

.year {
  font-size: 2.625rem;
  line-height: 0.775;
  margin-block: 0.05rem 1.5rem;
  height: calc(2.625rem * 0.775);
}
.desc {
  font-size: 1.75rem;
  margin-block-end: 0.1rem;
  line-height: 1.25;
}

.timeline-graphic-container {
  position: absolute;
  width: fit-content;
  height: 100%;
  left: 50%;
  top: 0;
  transform: translate(-50%, 0)
}
#timeline_animation {
  display: block;
  height: 100%;
}

@media (max-width: 47.9375rem) {
  .timeline-animation-container {
    padding-block: 3rem;
    padding-inline: 1rem
  }
  .timeline {
    grid-template-columns: 1fr;
  }
  .item:nth-child(2n+1) :is(.year, .desc) {
    text-align: left;
  }
  .item {
    padding-inline-start: 4rem;
  }

  .item:nth-child(1) { padding-block-start: 6rem; grid-column: 1; grid-row: 1; }
  .item:nth-child(2) { grid-column: 1; grid-row: 2; }
  .item:nth-child(3) { grid-column: 1; grid-row: 3; }
  .item:nth-child(4) { grid-column: 1; grid-row: 4; }
  .item:nth-child(5) { grid-column: 1; grid-row: 5; }
  .item:nth-child(6) { grid-column: 1; grid-row: 6; }
  .item:nth-child(7) { grid-column: 1; grid-row: 7; }
  .item:nth-child(8) { grid-column: 1; grid-row: 8; }
  .item:nth-child(9) { grid-column: 1; grid-row: 9; }
  .item:nth-child(10) { grid-column: 1; grid-row: 10; }
  .item:nth-child(11) { grid-column: 1; grid-row: 11; }
  .item:nth-child(12) { grid-column: 1; grid-row: 12; }
  .item:nth-child(13) { grid-column: 1; grid-row: 13; }
  .item:nth-child(14) { padding-block-end: 6rem; grid-column: 1; grid-row: 14; }

  .timeline-graphic-container {
    left: 0;
    transform: translate(0, 0)
  }
}