/* ----- Mixins ----- */
.timeline {
  --item-padding: 1em;
  --line-width: 0.2em;
  --dot-width: 1.1em;
  margin: var(--gap) auto;
}
.timeline__item {
  text-align: center;
  padding: 0 1em;
}
.timeline__year {
  font-size: var(--font-size-36);
  color: var(--color-text-primary, var(--color-primary));
  font-weight: var(--bold);
  letter-spacing: var(--letter-spacing);
  margin-bottom: 0.5em;
}
.timeline__dot {
  width: var(--dot-width);
  height: var(--dot-width);
  cursor: pointer;
  transition: all 0.25s ease-in-out;
  z-index: 2;
  background-color: var(--color-white);
  left: 50%;
  transform: translateX(-50%);
}
.timeline__dot::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-text-primary, var(--color-primary));
  border-radius: 50%;
  transition: all 0.25s ease-in-out;
  z-index: 3;
  transform: scale(0.6);
}
.timeline__dot::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  border: 0.15em solid var(--color-text-primary, var(--color-primary));
  border-radius: 50%;
  transition: all 0.25s ease-in-out;
  z-index: 3;
  transform: scale(1.3);
}
.timeline__line {
  width: calc(100% + var(--item-padding) * 2);
  height: var(--line-width);
  background-color: var(--color-text-primary, var(--color-primary));
  z-index: 1;
  left: calc(var(--item-padding) * -1);
  margin-top: calc(var(--dot-width) / 2 * -1);
}
.timeline__content {
  margin-top: 2em;
}
.timeline__content h3 {
  font-size: var(--font-size-24);
  font-weight: var(--semibold);
  color: var(--color-text-secondary, var(--color-secondary));
  margin-bottom: 0.5em;
  text-transform: uppercase;
}
.timeline__slide {
  flex: 0 0 30%;
  min-width: 0;
}
.timeline__slide:first-child .timeline__line {
  left: auto;
  right: calc(var(--item-padding) * -1);
  width: calc(50% + var(--item-padding));
  margin-left: auto;
}
.timeline__slide:last-child .timeline__line {
  mask-image: linear-gradient(to right, #000 50%, transparent 90%);
  mask-type: alpha;
}
.timeline__viewport {
  overflow: visible;
  margin: 0 auto;
  width: 100%;
}
.timeline__arrows {
  text-align: center;
  display: flex;
  justify-content: center;
  gap: 1em;
}
@media screen and (max-width: 1024px) {
  .timeline__slide {
    flex-basis: 40%;
  }
}
@media screen and (max-width: 600px) {
  .timeline__slide {
    flex-basis: 60%;
  }
}
@media screen and (max-width: 480px) {
  .timeline__slide {
    flex-basis: 100%;
  }
}