* { margin:0; padding:0; } 
html, body { width:100%; height:100%; overflow: hidden; background:black;} 
canvas { display:block; }
/* ✅ 折叠时 "Open Controls" 按钮背景完全透明 */
.dg.main.a .close-button {
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  color: rgba(255, 255, 255, 0.9) !important;
  backdrop-filter: none !important;
  padding: 6px 10px !important;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6); /* 增强文字对比度 */
}

/* 悬停时微微亮起，提供交互反馈 */
.dg.main.a .close-button:hover {
  background: rgba(255, 255, 255, 0.08) !important;
  color: #fff !important;
}