.space {
    display:none; /* Скрыт до старта */
  }

  #scoreboard {
    position:absolute;
    top:10px;
    left:10px;
    color:#00ff88;
    font-family:monospace;
    font-size:18px;
    display:none;
  }

  #start-btn {
    cursor:pointer;
    width:120px;
    transition:transform 0.2s ease, filter 0.2s ease;
    filter:drop-shadow(0 0 8px #00ff88);
  }

  #start-btn:hover {
    transform:scale(1.1);
    filter:drop-shadow(0 0 15px #00ff88);
  }