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

body {
  background: #87ceeb;
  overflow: hidden;
  font-family: system-ui, sans-serif;
  touch-action: none;
}

#hud {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 10;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.5;
  pointer-events: none;
  max-width: min(92vw, 360px);
}

#hud h1 { font-size: 16px; margin-bottom: 4px; }

canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  cursor: crosshair;
}