#control-panel{
  position: fixed;
  bottom: 1rem;
  left: 1rem;           /* war: left: 1rem */
  display: flex;
  flex-direction: column;
  gap: .4rem;
  z-index: 1000;
  touch-action: none;    /* verhindert Scroll/Zoom bei Touch auf Buttons */
}

#control-panel .row{ display:flex; justify-content:center; gap:.25rem; }

#control-panel button{
  width: 48px;           /* war: 44px */
  height: 48px;          /* war: 44px */
  font-size: 24px;       /* größerer Pfeil */
  border: none;
  border-radius: 12px;
  background: rgba(0,0,0,.6);
  color: #fff;
  cursor: pointer;
  user-select: none;
}

#control-panel button:active{ background: rgba(255,255,255,.35); }