body {
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #B500FF, #00AFFF);
  color: white;
  margin: 0;
  padding: 20px;
  text-align: center;
}

.screen.hidden { display: none; }

button {
  font-size: 20px;
  padding: 12px 20px;
  background: #FF1FA3;
  border: none;
  border-radius: 10px;
  color: white;
  margin-top: 10px;
  cursor: pointer;
}
button:hover { background: #FFD600; }

#tapBtn {
  margin-top: 25px;
  font-size: 30px;
  width: 160px;
  height: 160px;
  border-radius: 100%;
}