<div class="animated-card">
  <h3>动态卡片</h3>
  <p>悬停时触发阴影与背景动画</p>
</div>

.animated-card {
  width: 300px;
  padding: 20px;
  border-radius: 12px;
  background: linear-gradient(45deg, #6a11cb, #2575fc);
  color: white;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  transition: all 0.4s ease;
}

@keyframes bgShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.animated-card {
  background: linear-gradient(45deg, #6a11cb, #2575fc, #6a11cb);
  background-size: 300% 300%;
  animation: bgShift 4s ease infinite;
}

@keyframes shadowPulse {
  0% {
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  }
  50% {
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
  }
  100% {
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  }
}

.animated-card {
  animation: 
    bgShift 4s ease infinite,
    shadowPulse 3s ease-in-out infinite;
}

.animated-card:hover {
  animation: 
    bgShift 3s ease infinite,
    shadowPulse 2s ease-in-out infinite;
  transform: translateY(-5px);
}

.animated-card {
  transition: all 0.3s ease;
}

.animated-card:hover {
  box-shadow: 0 12px 30px rgba(0,0,0,0.25);
  transform: translateY(-6px);
}