.research-lead {
  margin: 1.25rem 0 1.75rem;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1rem 0 2rem;
}

.research-card,
.related-card {
  box-sizing: border-box;
  padding: 1rem 1.15rem;
  border: 1px solid #d9e2ea;
  background: #ffffff;
}

.research-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border-top: none;
}

.research-card-primary {
  grid-column: 1 / -1;
}

.research-card h3,
.related-card h3 {
  margin-top: 0;
}

.research-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: auto;
  padding-top: 0.75rem;
}

.research-links a,
.research-action a {
  display: inline-block;
  padding: 0.65rem 1rem;
  border-radius: 4px;
  background: #176fa8;
  color: #fff;
  font-weight: bold;
  line-height: 1.5;
  text-decoration: none;
}

.research-links a:hover,
.research-links a:focus,
.research-action a:hover,
.research-action a:focus {
  background: #0f4f79;
  text-decoration: underline;
}

.research-links a:focus-visible,
.research-action a:focus-visible {
  outline: 3px solid #f3aa20;
  outline-offset: 3px;
}

.research-topics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem 1rem;
  margin: 1rem 0 1.25rem;
  padding: 0;
  list-style: none;
}

.research-topics li {
  padding: 0.8rem 1rem 0.8rem 2.25rem;
  border: 1px solid #c9d8e6;
  background: #fff;
  position: relative;
}

.research-topics li::before {
  content: "";
  position: absolute;
  top: 1.05rem;
  left: 1rem;
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: #1674b7;
}

.research-action {
  margin: 1rem 0 2rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1rem 0 2rem;
}

.related-card p:last-child {
  margin-bottom: 0;
}

@media screen and (max-width: 800px) {
  .research-grid,
  .research-topics,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .research-card-primary {
    grid-column: auto;
  }

  /* スマホ表示でリストの左余白を確実に確保 */
  .main .research-topics > li {
    box-sizing: border-box;
    position: relative;
    padding: 0.8rem 0.75rem 0.8rem 2.25rem;
  }

  .main .research-topics > li::before {
    top: 1.2rem;
    left: 0.9rem;
  }
}

@media screen and (max-width: 520px) {
  .research-links {
    display: block;
  }

  .research-links a,
  .research-action a {
    display: block;
    margin-bottom: 0.75rem;
    text-align: center;
  }
}

@media print {
  .research-card,
  .related-card,
  .research-topics li {
    break-inside: avoid;
  }

  .research-links a,
  .research-action a {
    padding: 0;
    background: none;
    color: inherit;
    text-decoration: underline;
  }
}