body.research-body {
  margin: 0;
  background: linear-gradient(180deg, #f6f8f2 0%, #f2f2ec 100%);
  color: #2a2a2a;
  font-family: "Helvetica Neue", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.7;
}

.research-page {
  max-width: 1040px;
  margin: 36px auto 56px;
  padding: 0 18px;
}

.research-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  border-bottom: 1px solid #d7d7d7;
  padding-bottom: 12px;
}

.research-name {
  margin: 0;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  letter-spacing: 0.02em;
}

.research-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.research-nav a {
  color: #4f6445;
  text-decoration: none;
  font-size: 0.95rem;
}

.research-nav a:hover {
  text-decoration: underline;
}

.research-main {
  margin-top: 28px;
}

.research-main h2 {
  margin: 0 0 10px;
  font-size: clamp(1.8rem, 3vw, 2.9rem);
  line-height: 1.3;
}

.research-main p {
  margin: 0;
  color: #5c5c5c;
  font-size: 1.12rem;
}

.topic {
  margin-top: 58px;
}

.topic h3 {
  margin: 0 0 18px;
  font-size: clamp(1.35rem, 2vw, 1.9rem);
  line-height: 1.35;
}

.topic-grid {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 34px;
  align-items: start;
}

.topic-visual img {
  width: 100%;
  height: auto;
  border: 1px solid #d4d4d4;
  background: #fff;
}

.research-main p.topic-links {
  margin-top: 10px;
  font-size: 1rem;
  text-align: right;
}

.topic-links a {
  color: #4f5d78;
  text-decoration: none;
}

.topic-links a:hover {
  text-decoration: underline;
}

.topic-text p {
  margin: 0 0 16px;
  color: #595959;
}

.research-main p.topic-citation {
  color: #666;
  font-size: 1.0rem;
  line-height: 1.6;
  text-align: right;
}

.topic-citation .self-name {
  font-weight: 700;
  text-decoration: underline;
}

@media (max-width: 900px) {
  .topic-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
}

.research-name a {
  color: #242424;
  text-decoration: none;
}

.research-name a:visited,
.research-name a:hover,
.research-name a:active {
  color: #242424;
  text-decoration: none;
}