/* 页脚样式优化 */
footer {
  max-width: 100%;
  text-align: center;
  margin-top: 3rem;
  padding: 2rem;
  background-color: #8B5A2B;
  color: #003300;
  border-radius: 10px;
  /* 增加圆角，与整体风格统一 */
}

footer a {
  color: #003300;
  text-decoration: none;
  margin: 0 5px;
}

footer a:hover {
  text-decoration: underline;
  /*  hover时显示下划线 */
}