.p-history-cont {
  padding: 5rem 0;
}

.history-cont__list {
  position: relative;
  padding: 3.2rem 0 14rem;
}

.history-cont__list::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 100%;
  content: "";
  background: rgba(15, 15, 15, 0.1);
}

.history-cont__item {
  position: relative;
  margin-bottom: 7rem;
}

.history-cont__item:nth-of-type(odd) .history-cont__item-inner {
  padding: 1px 0 0 5.2rem;
}

.history-cont__item:nth-of-type(odd) .history-cont__item-inner::before {
  left: 0;
  transform-origin: left;
}

.history-cont__item:nth-of-type(odd) .history-cont__item-inner::after {
  left: 4rem;
}

.history-cont__item:nth-of-type(even) .history-cont__item-inner {
  padding: 1px 0 0 5.2rem;
}

.history-cont__item:nth-of-type(even) .history-cont__item-inner::before {
  left: 0;
  transform-origin: left;
}

.history-cont__item:nth-of-type(even) .history-cont__item-inner::after {
  left: 4rem;
}

.history-cont__item:last-child {
  margin-bottom: 0;
}

.history-cont__item-inner {
  position: relative;
}

.history-cont__item-inner::before {
  position: absolute;
  top: 2.5rem;
  width: 4.2rem;
  height: 1px;
  content: "";
  background: rgba(15, 15, 15, 0.1);
  transform: scaleX(0);
  opacity: 0;
}

.history-cont__item-inner.is_active::before {
  opacity: 1;
  transition: transform 0.6s cubic-bezier(0, 0.4, 0.3, 1);
  transform: scaleX(1);
}

.history-cont__item-inner::after {
  position: absolute;
  top: 2.5rem;
  width: 0.5rem;
  height: 0.5rem;
  margin-top: -0.2rem;
  content: "";
  background: #0f0f0f;
  border-radius: 50%;
  opacity: 0;
}

.history-cont__item-inner.is_active::after {
  transition: opacity 0.8s 0.5s;
  opacity: 1;
}

.history-cont__item-year {
  margin-top: -1.3rem;
  font-family: orpheuspro, serif;
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: 0.01em;
  transform: translateY(2.5rem);
  font-size: 20px;
  font-size: 2rem;
}

.history-cont__item-block {
  margin-top: 1.85rem;
}

.history-cont__item-block+.history-cont__item-block {
  margin-top: 3.15rem;
}

.history-cont__item-month {
  margin-bottom: 1.15rem;
  font-family: TazuganeGothicStdN-Regular source-han-sans-japanese, "游ゴシック体", YuGothic, "游ゴシック Medium", "Yu Gothic Medium", "游ゴシック", "Yu Gothic", source-han-sans-japanese, -apple-system, blinkmacsystemfont, roboto, "Segoe UI", "Helvetica Neue", helveticaneue, verdana, meiryo, sans-serif;
  letter-spacing: 0;
  transform: translateY(2.5rem);
  font-size: 12px;
  font-size: 1.2rem;
}

.history-cont__item-txt {
  margin-bottom: 1.15rem;
  /* line-height: 2; */
  letter-spacing: 0;
  transform: translateY(2.5rem);
  font-size: 12px;
  font-size: 1.2rem;
}

.history-cont__item-img {
  position: relative;
  z-index: 1;
  overflow: hidden;
  transform: translateY(2.5rem);
}

.history-cont__item-img img {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
  object-fit: cover;
  transform: scale(1.35);
}

@media screen and (min-width: 768px) {
  .p-history-cont {
    padding: 5.6rem 10rem;
  }

  .history-cont__list {
    padding: 11.6rem 0 20rem;
  }

  .history-cont__list::before {
    left: 50%;
    margin-left: -0.5px;
  }

  .history-cont__item {
    display: flex;
    flex-direction: column;
    margin-bottom: 0;
  }

  .history-cont__item:nth-of-type(odd) {
    align-items: flex-start;
  }

  .history-cont__item:nth-of-type(odd) .history-cont__item-inner {
    padding: 0 9.9rem 0 0;
  }

  .history-cont__item:nth-of-type(odd) .history-cont__item-inner::before {
    right: 0;
    left: auto;
    transform-origin: right;
  }

  .history-cont__item:nth-of-type(odd) .history-cont__item-inner::after {
    right: calc(1% - 1.05rem);
    left: auto;
  }

  .history-cont__item:nth-of-type(even) {
    align-items: flex-end;
  }

  .history-cont__item:nth-of-type(even) .history-cont__item-inner {
    padding-left: 10rem;
  }

  .history-cont__item:nth-of-type(even) .history-cont__item-inner::after {
    left: calc(1% - 1.05rem);
  }

  .history-cont__item:nth-of-type(even) .history-cont__item-year {
    text-align: right;
    width: 100%;
  }

  .history-cont__item+.history-cont__item {
    /* margin-top: -5rem; */
  }

  .history-cont__item.--noimg+.history-cont__item {
    margin-top: -6.5rem;
  }

  .history-cont__item-inner {
    width: 50%;
  }

  .history-cont__item-inner::before {
    width: 85%;
  }

  .history-cont__item-inner::after {
    width: 0.8rem;
    height: 0.8rem;
    margin-top: -0.35rem;
  }

  .history-cont__item-year {
    margin-top: -1.6rem;
    font-size: 28px;
    font-size: 2.8rem;
  }

  .history-cont__item-block {
    margin-top: 2rem;
  }

  .history-cont__item-block+.history-cont__item-block {
    margin-top: 3.6rem;
  }

  .history-cont__item-month {
    /* margin-bottom: 1.15rem; */
  }

  .history-cont__item-txt {
    /* margin-bottom: 3.6rem;
        line-height: 1.7142857143; */
    letter-spacing: 0.05em;
    font-size: 14px;
    font-size: 1.4rem;
  }
}