/* 课程网格 */
.classic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 2.5rem;
  margin-top: 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.classic-card {
  background-color: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
  transition: transform 0.3s ease;
}

.classic-card:hover {
  transform: translateY(-12px);
}

.classic-img {
  height: 200px;
  overflow: hidden;
}

.classic-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.classic-info {
  padding: 2rem;
}

.classic-title {
  font-size: 1.8rem;
  margin-bottom: 0.8rem;
  color: #333;
}

.classic-desc {
  color: #666;
  margin-bottom: 1.2rem;
  font-size: 1rem;
}

@media (max-width: 1200px) {
  .classic-grid {
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

@media (max-width: 992px) {
  .classic-grid {
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }
}

@media (max-width: 768px) {
  .classic-grid {
      grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }
  
  .classic-img {
      height: 150px;
  }
  
  .classic-info {
      padding: 1.2rem;
  }
  
  .classic-title {
      font-size: 1.5rem;
  }
  
  .classic-desc {
      font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  .classic-grid {
      grid-template-columns: 1fr;
      gap: 1.2rem;
  }
  
  .classic-card {
      margin: 0 auto;
      max-width: 320px;
  }
  
  .classic-img {
      height: 180px;
  }
}