body {
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  background-color: #f5f5f5;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  background-color: #ffffff;
  padding: 5px 0;
  z-index: 100;
}

.container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 80px; /* 考虑标题栏高度 */
}

.card {
  width: 300px;
  padding: 20px;
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin: 10px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s;
}

.card:hover {
  transform: translateY(-5px);
}

.card h2 {
  margin-top: 0;
  font-size: 28px;
}

.card p {
  margin: 10px 0;
}

.footer {
  margin-top: 20px;
  text-align: center;
  font-size: 14px;
  color: #666;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background-color: #f5f5f5;
  padding: 10px 0;
  z-index: 100;
}

.footer a {
  text-decoration: none;
  color: #666;
}

.footer a:hover {
  text-decoration: underline;
}