body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #1e1e2f, #121212);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

/* Card central */
.container {
  background: #1f1f2e;
  padding: 20px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  width: 90%;
  max-width: 350px;
}

/* Imagem */
.img {
  width: 50%;
  max-width: 500px;
  display: block;
  margin: 0 auto 20px;
}

/* Tempo */
#tempo {
  font-size: 48px;
  font-weight: bold;
  color: #00ffcc;
  margin-bottom: 20px;
  text-shadow: 0 0 15px rgba(0, 255, 204, 0.8);
}

/* Botões */
button {
  background: #2c2c3e;
  font-size: 18px;
  color: white;
  border: none;
  border-radius: 25px;
  padding: 10px 20px;
  margin: 5px;
  cursor: pointer;
  transition: 0.3s;
}

/* Hover */
button:hover {
  background: #00ffcc;
  color: #000;
  transform: scale(1.05);
}