/* 扩展样式 */
.ui-style-5 {
  /* UI风格特定样式 */
}

.card h2 {
  color: #34495e;
  font-size: 22px;
  margin-bottom: 15px;
  border-bottom: 2px solid #3498db;
  padding-bottom: 10px;
}

.video-item {
  transition: all 0.3s ease;
}

.video-item:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.btn {
  cursor: pointer;
  font-size: 14px;
}

@media (max-width: 480px) {
  .container {
    padding: 15px;
  }

  h1 {
    font-size: 20px;
  }

  .card {
    padding: 15px;
  }
}