body {
  font-family: 'Orbitron', sans-serif;
  text-align: center;
  background: linear-gradient(-45deg, #3A0CA3, #7209B7, #4361EE, #4CC9F0);
  background-size: 400% 400%;
  animation: gradient 10s ease infinite;
  color: white;
  padding: 20px;
}

@keyframes gradient {
  0% {background-position: 0% 50%;}
  50% {background-position: 100% 50%;}
  100% {background-position: 0% 50%;}
}

h1 {
  font-size: 36px;
  margin-bottom: 10px;
}

button {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
  color: white;
  padding: 12px 24px;
  margin: 5px;
  font-size: 16px;
  cursor: pointer;
  border-radius: 12px;
  font-weight: bold;
  transition: transform 0.2s ease;
}

button:hover {
  transform: scale(1.05);
  background: rgba(255, 255, 255, 0.2);
}

#letras button {
  margin: 3px;
  width: 40px;
  height: 40px;
  font-size: 18px;
}

#letras button:disabled {
  opacity: 0.5;
  transform: rotateY(180deg);
  transition: transform 0.4s ease;
}

#palavra {
  font-size: 28px;
  margin: 20px 0;
  letter-spacing: 8px;
}

#mensagem {
  font-size: 20px;
  margin-top: 10px;
}

#selos {
  font-size: 20px;
  margin-top: 15px;
}

.selo {
  font-size: 28px;
  color: gold;
  text-shadow: 0 0 10px gold;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% {transform: scale(1);}
  50% {transform: scale(1.1);}
  100% {transform: scale(1);}
}

@media (max-width: 600px) {
  #letras button {
    width: 30px;
    height: 30px;
    font-size: 14px;
  }

  h1 {
    font-size: 28px;
  }

  #palavra {
    font-size: 22px;
    letter-spacing: 4px;
  }
}