.topics-header {
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px solid #eee;
}
.topics-title {
  font-size: 32px;
  color: #2c3e50;
  margin-bottom: 10px;
}
.topics-subtitle {
  color: #666;
  font-size: 16px;
}
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.topic-card {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 12px;
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}
.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  border-color: #3498db;
}
.topic-cover {
  height: 140px;
  border-radius: 10px;
  background-size: cover;
  background-position: center;
  margin-bottom: 15px;
}
.topic-cover-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f5f7fa;
  color: #666;
  font-weight: 600;
  font-size: 18px;
}
.topic-name {
  font-size: 18px;
  color: #2c3e50;
  margin: 0 0 6px;
}
.topic-count {
  color: #999;
  font-size: 14px;
}
.posts-list {
  margin-top: 20px;
}
.post-item {
  padding: 15px 0;
  border-bottom: 1px solid #eee;
}
.post-item:last-child {
  border-bottom: none;
}
.post-title {
  color: #2c3e50;
  text-decoration: none;
  font-weight: 500;
}
.post-title:hover {
  color: #3498db;
}
.post-meta {
  color: #999;
  font-size: 0.85em;
  margin-top: 6px;
}
.pagination {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
}
.pagination a {
  color: #3498db;
  text-decoration: none;
}
.pagination a:hover {
  text-decoration: underline;
}
.pagination .disabled {
  color: #bbb;
}
.page-info {
  color: #666;
}
.back-link {
  margin-top: 30px;
}
.back-link a {
  color: #666;
  text-decoration: none;
}
.back-link a:hover {
  color: #3498db;
}