/* 工具类 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.text-center {
  text-align: center;
}

.mt-4 {
  margin-top: 1rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

.p-4 {
  padding: 1rem;
}

.rounded {
  border-radius: 0.375rem;
}

.shadow {
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
}