.chronology__period + .chronology__period {
  margin-top: 5em;
}
.chronology__period-title {
  font-family: "Noto Serif JP", serif;
  font-size: 1.5em;
  font-weight: bold;
  line-height: 2;
  margin-bottom: 2em;
}
@media (max-width: 768px) {
  .chronology__period-title {
    font-size: 1.25em;
    margin-bottom: 1.5em;
  }
}
.chronology__year {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
}
.chronology__year-text {
  font-family: "Noto Serif JP", serif;
  font-size: 1.25em;
  padding-right: 1.8em;
  position: relative;
}
@media (max-width: 768px) {
  .chronology__year-text {
    font-size: 1em;
    padding-right: 1.5em;
  }
}
.chronology__year-list {
  padding-left: 2.25em;
  padding-bottom: 3.5em;
  position: relative;
}
@media (max-width: 768px) {
  .chronology__year-list {
    padding-left: 1.5em;
    padding-bottom: 2.5em;
  }
}
.chronology__year-list::before {
  content: "";
  display: block;
  width: 1px;
  height: 100%;
  background-color: #E8E8E8;
  position: absolute;
  top: 1em;
  left: 0;
}
.chronology__year-list::after {
  content: "";
  display: block;
  width: 12px;
  height: 12px;
  background-color: #1B2F6C;
  border-radius: 50%;
  border: 2px solid #8C88BB;
  position: absolute;
  top: 1em;
  left: 0;
  -webkit-transform: translate(-50%, -15%);
          transform: translate(-50%, -15%);
}
@media (max-width: 768px) {
  .chronology__year-list::after {
    top: 0.8em;
  }
}
.chronology__year-item {
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: start;
  -webkit-align-items: flex-start;
      -ms-flex-align: start;
          align-items: flex-start;
  gap: 1.875em;
  padding-top: 0.15em;
  padding-left: 1em;
  position: relative;
}
@media (max-width: 768px) {
  .chronology__year-item {
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
        -ms-flex-direction: column;
            flex-direction: column;
    gap: 0.5em;
  }
}
.chronology__year-item::before {
  content: "";
  display: block;
  width: 5px;
  height: 5px;
  background-color: #8C88BB;
  border-radius: 50%;
  position: absolute;
  top: 1em;
  left: 0;
}
@media (max-width: 768px) {
  .chronology__year-item::before {
    top: 0.8em;
  }
}
.chronology__year-item + .chronology__year-item {
  margin-top: 1.5em;
}
.chronology__year-item-sub {
  color: #888888;
  min-width: 66px;
}
@media (max-width: 768px) {
  .chronology__year-item-sub {
    font-size: 0.875em;
  }
}
.chronology__year-item-main {
  font-weight: bold;
}
@media (max-width: 768px) {
  .chronology__year-item-main {
    font-size: 0.875em;
  }
}