body {
  font-family: Arial, sans-serif;
  background-color: #f3f3f3;
  padding: 20px;
  color: #333;
  margin: 0;
}

.container {
  max-width: 600px;
  background-color: #fff;
  margin: 0 auto;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
  text-align: center;
  color: #2c3e50;
}

.livro {
  margin-bottom: 30px;
}

.livro h2 {
  margin: 10px 0 5px;
  color: #2c3e50;
}

.livro-img {
  width: 100%;
  max-width: 250px; /* reduzido */
  height: auto;
  border-radius: 8px;
  margin-bottom: 10px;
  display: block;
  margin-left: auto;
  margin-right: auto; /* centraliza */
}


label {
  display: block;
  margin-top: 15px;
  font-weight: bold;
}

input[type="text"] {
  margin-top: 5px;
  width: 100%;
  padding: 10px;
  font-size: 16px;
  box-sizing: border-box;
}

.checkbox-label {
  display: block;
  margin-top: 10px;
  font-weight: normal;
}

.btn {
  background-color: #25D366;
  color: white;
  padding: 15px;
  text-align: center;
  display: block;
  width: 100%;
  font-size: 18px;
  border: none;
  border-radius: 8px;
  margin-top: 20px;
  cursor: pointer;
}

.btn:hover {
  background-color: #1ebe5d;
}

.preco {
  font-weight: bold;
  margin-top: 5px;
  color: #27ae60;
}

.sucesso {
  display: none;
  color: green;
  font-weight: bold;
  margin-top: 20px;
  text-align: center;
}

/* Responsivo para celulares */
@media (max-width: 600px) {
  .container {
    padding: 20px;
  }

  .btn {
    font-size: 16px;
    padding: 12px;
  }

  .livro-img {
    margin-top: 10px;
  }
}