body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(to right, #141e30, #243b55);
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.screen {
  display: none;
  text-align: center;
  background: rgba(255, 255, 255, 0.05);
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
  width: 300px;
}

.screen.active {
  display: block;
}

input[type="text"],
input[type="number"] {
  padding: 8px;
  width: 80%;
  margin-bottom: 10px;
  border: none;
  border-radius: 5px;
  outline: none;
}

button {
  padding: 10px 20px;
  margin: 5px;
  border: none;
  border-radius: 5px;
  background-color: #4CAF50;
  color: white;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #45a049;
}

#xp-bar {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 5px;
  overflow: hidden;
  height: 20px;
  margin-bottom: 15px;
}

#xp-progress {
  background: #4CAF50;
  height: 100%;
  width: 0%;
  transition: width 0.3s ease;
}

.hidden {
  display: none;
}