/* 研究文献页面样式 */
.references-section {
  padding: 120px 0 80px;
  background-color: #f8f9fb;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-title {
  font-size: 2.5rem;
  color: #333;
  margin-bottom: 15px;
  position: relative;
  font-weight: 700;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background-color: #2e82ff;
  border-radius: 3px;
}

.section-description {
  max-width: 900px;
  margin: 0 auto;
  font-size: 1.1rem;
  color: #666;
  line-height: 1.6;
  margin-top: 25px;
}

/* 分类导航 */
.references-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 15px;
  margin-bottom: 40px;
}

.nav-button {
  padding: 10px 18px;
  background-color: transparent;
  border: 1px solid #ddd;
  border-radius: 30px;
  font-size: 0.95rem;
  color: #555;
  cursor: pointer;
  transition: all 0.3s ease;
}

.nav-button:hover {
  border-color: #2e82ff;
  color: #2e82ff;
}

.nav-button.active {
  background-color: #2e82ff;
  color: #fff;
  border-color: #2e82ff;
}

/* 参考文献列表 */
.references-list {
  max-width: 1400px;
  margin: 0 auto;
}

.reference-item {
  display: flex;
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid #e5e9f2;
}

.reference-year {
  flex: 0 0 80px;
  font-size: 1.5rem;
  font-weight: 700;
  color: #2e82ff;
  padding-top: 5px;
}

.reference-content {
  flex: 1;
}

.reference-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 10px;
  line-height: 1.4;
}

.reference-authors {
  font-size: 1.05rem;
  color: #555;
  margin-bottom: 8px;
}

.reference-journal {
  font-size: 1rem;
  font-style: italic;
  color: #777;
  margin-bottom: 15px;
}

.reference-links {
  display: flex;
  gap: 20px;
  margin-bottom: 15px;
}

.reference-link {
  display: inline-flex;
  align-items: center;
  color: #2e82ff;
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.3s ease;
}

.reference-link i {
  margin-right: 5px;
}

.reference-link:hover {
  color: #0b5ed7;
  text-decoration: underline;
}

.reference-abstract {
  font-size: 0.95rem;
  color: #666;
  line-height: 1.6;
  background-color: #f0f4ff;
  padding: 15px;
  border-radius: 8px;
  border-left: 4px solid #2e82ff;
}

/* 响应式样式 */
@media (max-width: 992px) {
  .references-section {
    padding: 100px 0 60px;
  }

  .section-title {
    font-size: 2.2rem;
  }

  .section-description {
    font-size: 1rem;
  }

  .reference-item {
    flex-direction: column;
    padding-bottom: 30px;
    margin-bottom: 30px;
  }

  .reference-year {
    margin-bottom: 15px;
  }
}

@media (max-width: 768px) {
  .references-section {
    padding: 80px 0 40px;
  }

  .section-title {
    font-size: 2rem;
  }

  .nav-button {
    font-size: 0.9rem;
    padding: 8px 15px;
  }

  .reference-title {
    font-size: 1.2rem;
  }
}

@media (max-width: 576px) {
  .section-title {
    font-size: 1.8rem;
  }

  .section-description {
    font-size: 0.95rem;
  }

  .reference-links {
    flex-direction: column;
    gap: 10px;
  }
}

.research-articles {
  padding: 60px 0;
  background-color: #fff;
}

.research-articles .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.research-articles h2 {
  font-size: 2.5rem;
  color: #333;
  margin-bottom: 25px;
  font-weight: 700;
}

.research-articles p {
  color: #555;
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.research-articles>.container>p:first-of-type {
  margin-bottom: 30px;
}

.research-articles>.container>p:nth-of-type(2) {
  margin-bottom: 40px;
}

.lancet-text {
  color: #3a71ca;
  font-weight: 600;
}

.research-highlight {
  display: flex;
  margin-top: 30px;
  gap: 50px;
}

.article-image {
  flex: 0 0 40%;
}

.article-image img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.article-findings {
  flex: 0 0 55%;
}

.article-findings h3 {
  color: #3a71ca;
  font-size: 1.35rem;
  margin-bottom: 50px;
  line-height: 1.4;
  font-weight: 600;
}

.finding-item {
  margin-bottom: 50px;
  position: relative;
  border-left: 4px solid #3a71ca;
  padding: 0 0 0 20px;
  display: flex;
  align-items: center;
}

.finding-item p {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.5;
  padding: 10px 0;
}

.highlight-number {
  color: #3a71ca;
  font-weight: 700;
  font-size: 1.2rem;
}

/* Styling for the article link */
.research-articles a {
  color: #3a71ca;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease, text-decoration 0.3s ease;
}

.research-articles a:hover {
  color: #1d55af;
  text-decoration: underline;
}

/* Responsive styles */
@media (max-width: 992px) {
  .research-highlight {
    flex-direction: column;
    gap: 30px;
  }

  .article-image {
    flex: 0 0 100%;
    max-width: 500px;
    margin: 0 auto;
  }

  .article-findings {
    flex: 0 0 100%;
  }
}

@media (max-width: 768px) {
  .research-articles {
    padding: 40px 0;
  }

  .research-articles h2 {
    font-size: 2rem;
  }

  .research-articles p {
    font-size: 1rem;
  }

  .article-findings h3 {
    font-size: 1.2rem;
  }

  .finding-item p {
    font-size: 1rem;
  }
}

@media (max-width: 576px) {
  .research-articles h2 {
    font-size: 1.8rem;
  }

  .article-image {
    max-width: 100%;
  }

  .finding-item {
    padding-left: 15px;
  }
}