.site-footer{
  background:#ffffff;
  border-top:1px solid #e5e7eb;
  margin-top:20px;
}

.footer-inner{
  max-width:1200px;
  margin:0 auto;
  padding:16px 20px 20px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:12px;
  text-align:center;
}

.footer-links{
  display:grid;
  grid-template-columns:repeat(4, auto);
  justify-content:center;
  align-items:center;
  gap:12px 34px;
}

.footer-links a{
  color:#374151;
  text-decoration:none;
  font-size:15px;
  font-weight:500;
  line-height:1.6;
  white-space:nowrap;
}

.footer-links a:hover{
  color:#163f35;
}

.footer-copy{
  font-size:13px;
  color:#9ca3af;
  margin-bottom:8px;
  letter-spacing:0.5px;
}

/* 回到顶部 / 返回上一页 */
.back-top,
.back-page{
  position:fixed;
  right:22px;
  width:42px;
  height:42px;
  border:none;
  border-radius:50%;
  background:#163f35;
  color:#fff;
  font-size:18px;
  cursor:pointer;
  box-shadow:0 8px 20px rgba(0,0,0,0.12);
  z-index:999;
}

.back-top{
  bottom:82px;
}

.back-page{
  bottom:28px;
}

.back-top:hover,
.back-page:hover{
  opacity:0.92;
}

@media (max-width: 768px){
  .site-footer{
    margin-top:8px;
  }

  .footer-inner{
    padding:10px 12px 16px;
    gap:10px;
  }

  .footer-links{
    display:flex;
    justify-content:space-between;
    align-items:center;
    flex-wrap:nowrap;
    width:100%;
    max-width:360px;
    gap:8px;
  }

  .footer-links a{
    font-size:12px;
    white-space:nowrap;
    flex:1;
    text-align:center;
  }

  .back-top,
  .back-page{
    right:14px;
    width:38px;
    height:38px;
    font-size:16px;
  }

  .back-top{
    bottom:74px;
  }

  .back-page{
    bottom:24px;
  }
}