#overseas-post .ttl-box {
  margin-top: 96px;
  position: relative;
}
#overseas-post .archive-year {
  position: absolute;
  z-index: 1;
  top: 0;
  right: 0;
  width: 200px;
  border-radius: 16px;
  overflow: hidden;
}
#overseas-post .archive-year-btn {
  background: #3caad4;
  color: #fefefe;
  border: none;
  width: 100%;
  font-size: 1.4rem;
  line-height: 1.6;
  font-weight: 500;
  padding: 16px 24px;
  transition: all 0.3s;
}
#overseas-post .archive-year-btn::after {
  content: "";
  display: inline-block;
  -webkit-mask: url(../img/common/ico_triangle_btm_bl.svg) no-repeat center center/contain;
          mask: url(../img/common/ico_triangle_btm_bl.svg) no-repeat center center/contain;
  background: currentColor;
  width: 13px;
  height: 12px;
  margin-left: 6px;
}
#overseas-post .archive-year-btn:hover {
  opacity: 0.8;
  transition: all 0.3s;
}
#overseas-post .archive-year-list {
  display: none;
  background: #fefefe;
  color: #3caad4;
  text-align: center;
}
#overseas-post .archive-year-list li {
  position: relative;
}
#overseas-post .archive-year-list li:last-of-type::after {
  content: none;
}
#overseas-post .archive-year-list li::after {
  content: "";
  display: block;
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: repeating-linear-gradient(to right, #3caad4 0, #3caad4 2px, transparent 2px, transparent 4px);
}
#overseas-post .archive-year-list a {
  display: block;
  font-size: 1.4rem;
  font-weight: 500;
  padding: 16px 24px;
}
#overseas-post .archive-year-list a:hover {
  background: rgba(60, 170, 212, 0.05);
}
#overseas-post .overseas-post .h2 {
  margin-top: 64px;
}
#overseas-post .post-box {
  margin-top: 64px;
  border-radius: 16px;
  border: 1px solid #3caad4;
  padding: 63px 47px;
}
#overseas-post .post-box + .post-box {
  margin-top: 32px;
}
#overseas-post .top-box .date {
  margin: 18px auto 0;
  background: #3caad4;
  color: #fefefe;
  border-radius: 4px;
  width: 134px;
  text-align: center;
  font-size: 1.4rem;
  line-height: 26px;
  letter-spacing: 0.08em;
}
#overseas-post .btm-box {
  margin-top: 48px;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
#overseas-post .btm-box .img {
  aspect-ratio: 328/219;
  background: #fefefe;
}
#overseas-post .btm-box .img img {
  width: 100%;
  height: 100%;
  -o-object-fit: contain;
     object-fit: contain;
}

@media screen and (max-width: 767px) {
  #overseas-post .ttl-box {
    grid-template-columns: 1fr;
  }
  #overseas-post .archive-year {
    position: static;
    width: 100%;
    margin-top: 64px;
  }
  #overseas-post .post-box {
    padding: 63px 4.4%;
  }
  #overseas-post .top-box .ttl {
    font-size: 1.8rem;
  }
  #overseas-post .btm-box {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}