body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f4f4f9;
}

.container {
  max-width: 800px;
  margin: 50px auto;
  padding: 20px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
  text-align: center;
  color: #333;
}

textarea,
input {
  width: 100%;
  padding: 10px;
  margin: 10px 0;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 16px;
}

textarea {
  height: 150px;
}

.input-group {
  display: flex;
  gap: 10px;
}

button {
  padding: 10px 20px;
  background: #007bff;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
}

button:hover {
  background: #0056b3;
}

.hidden {
  display: none;
}

#pdfPreview {
  margin-top: 10px;
  border: 1px solid #ccc;
  padding: 10px;
  background-color: #f9f9f9;
}