* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
}

a-scene {
  width: 100%;
  height: 100%;
}

/* Layer-Panel oben rechts */
#layer-panel {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 100;
  background: rgba(12, 12, 12, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 4px;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  user-select: none;
}
#layer-panel label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.65);
  font: 12px/1 sans-serif;
  cursor: pointer;
}
#layer-panel label:hover {
  color: #fff;
}
#layer-panel input[type="checkbox"] {
  accent-color: #7ecfff;
  width: 13px;
  height: 13px;
  cursor: pointer;
  flex-shrink: 0;
}
.panel-buttons {
  display: flex;
  gap: 6px;
  margin-top: 4px;
}
.panel-buttons button {
  flex: 1;
  background: rgba(126, 207, 255, 0.10);
  border: 1px solid rgba(126, 207, 255, 0.30);
  border-radius: 3px;
  color: rgba(255, 255, 255, 0.65);
  font: 11px/1 sans-serif;
  padding: 5px 8px;
  cursor: pointer;
}
.panel-buttons button:hover {
  background: rgba(126, 207, 255, 0.22);
  color: #fff;
}
.panel-nav-btn {
  flex: 1;
  background: rgba(126, 207, 255, 0.10);
  border: 1px solid rgba(126, 207, 255, 0.30);
  border-radius: 3px;
  color: rgba(255, 255, 255, 0.65);
  font: 11px/1 sans-serif;
  padding: 5px 8px;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}
.panel-nav-btn:hover {
  background: rgba(126, 207, 255, 0.22);
  color: #fff;
}