body {
  height: 100vh;
  background-color: #2e7022;
  margin: 0;
  padding: 0;
  overflow: hidden;
}
   /* 确保body和html占满全屏 */
 body, html {
   margin: 0;
   padding: 0;
   width: 100%;
   height: 100%;
   overflow: hidden; /* 防止滚动条出现 */
 }

/* canvas-wrapper全屏显示在最下层 */
#canvas-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1; /* 较低层级 */
}

/* 登录容器居中显示在上层 */
.login-container {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 100; /* 较高层级确保在上方 */
  /*background: rgba(255, 255, 255, 0.9); !* 半透明背景 *!*/
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 0 20px rgba(100, 74, 74, 0.2);
  width: 400px;
  max-width: 90%; /* 小屏幕上保持边距 */
}

/* 响应式调整 */
@media (max-width: 480px) {
  .login-container {
    width: 70%;
    padding: 1.5rem;
  }
}