* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body, #cesiumContainer {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #000;
  font-family: monospace;
}

/* 画面中央の照準マーク */
#crosshair {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #00ff00;
  font-size: 30px;
  pointer-events: none;
  text-shadow: 0 0 5px #00ff00;
}

/* 航空計器風のHUD */
#instrument-panel {
  position: absolute;
  top: 20px;
  left: 20px;
  color: #00ff00;
  background: rgba(0, 20, 0, 0.6);
  border: 1px solid #00ff00;
  padding: 15px;
  border-radius: 5px;
  font-size: 16px;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.2);
}

/* 操作ガイド */
#controls-guide {
  position: absolute;
  bottom: 20px;
  right: 20px;
  color: #00ff00;
  background: rgba(0, 20, 0, 0.6);
  border: 1px solid #00ff00;
  padding: 10px 15px;
  border-radius: 5px;
  font-size: 12px;
}