.research-archive__empty {
  padding: 2rem 0;
  border-bottom: 1px solid #dddddd;
}

.research-archive__pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.research-archive__pagination a,
.research-archive__pagination span {
  display: grid;
  place-items: center;
  min-width: 2rem;
  min-height: 2rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid #dddddd;
  color: #333333;
  text-decoration: none;
}

.research-archive__pagination .active span,
.research-archive__pagination a:hover {
  border-color: #269b67;
  background: #269b67;
  color: #ffffff;
}

.research-detail {
  --research-detail-content-gap: 1.5rem;
  --research-detail-rule: #d9d9d9;
}

.research-detail .news__detail__date {
  font-family: 'Noto Serif JP', 'ヒラギノ明朝 Pro W6', 'Hiragino Mincho Pro', 游明朝, 'Yu Mincho', 游明朝体, YuMincho, serif;
}

.research-detail .news__detail__ttl__sub {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  column-gap: 1rem;
  row-gap: 0.5rem;
  margin-bottom: 1rem;
}

.research-detail .news__detail__ttl h2 {
  font-size: clamp(1.6rem, 1.3rem + 0.8vw, 1.8rem);
  line-height: 1.6;
}

.research-detail .news__detail__ttl {
  margin-bottom: 1.8rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--research-detail-rule);
}

.research-detail .news__detail__cnt {
  line-height: 1.9;
}

.research-detail .news__detail__cnt > * {
  margin-top: var(--research-detail-content-gap);
}

.research-detail .news__detail__cnt > :first-child {
  margin-top: 0;
}

.research-detail .news__detail__cnt img,
.research-detail .news__detail__cnt video {
  max-width: 100%;
  height: auto;
}

.research-detail .news__detail__cnt iframe {
  max-width: 100%;
}

.research-detail__back a {
  transition: opacity 0.2s ease;
}

.research-detail .research-detail__back a:hover {
  opacity: 0.7;
}

.research-detail__not-found {
  padding: 2rem;
  text-align: center;
}

@media (max-width: 767px) {
  .research-detail .news__detail__ttl__sub {
    row-gap: 0.75rem;
    margin-bottom: 1.25rem;
  }

  .research-detail .news__detail__ttl {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
  }

  .research-detail .news__detail__cnt {
    line-height: 1.85;
    overflow-x: auto;
  }

  .research-detail .news__detail__cnt > * {
    margin-top: 1.25rem;
  }
}