.footer {
    background: linear-gradient(to bottom, #474252, #182848);
    padding: 30px 15px;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  }
  .friend-title {
    text-align: center;
    font-size: 18px;
    color: #fff;
    font-weight: bold;
    margin-bottom: 12px;
    letter-spacing: 1px;
  }
  .categorySwitch {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
  }
  .categorySwitch li {
    margin: 0;
  }
  .categorySwitch a {
    display: inline-block;
    font-size: 14px;
    color: #66ccff;
    text-decoration: none;
    padding: 5px 10px;
    transition: color 0.3s;
  }
  .categorySwitch a:hover {
    color: #99e0ff;
    text-decoration: underline;
  }
  .footer-note {
    text-align: center;
    font-size: 15px;
    color: #eeeeee;
    line-height: 1.8;
    max-width: 800px;
    margin: 0 auto 10px auto;
  }
  .footer-note a {
    color: #dddddd;
    text-decoration: none;
  }
  .footer-note a:hover {
    text-decoration: underline;
  }
  .update-time {
    text-align: center;
    font-size: 15px;
    color: #ffeb3b;
    margin-top: 10px;
  }