.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid #f0f0f0;
}
.card-title {
  font-size: 18px;
  font-weight: 600;
  color: #333;
  margin: 0;
}
.card-subtitle {
  font-size: 13px;
  color: #999;
  margin: 4px 0 0 0;
}