body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f4f6f8;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 1rem;
}

.container {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  text-align: center;
  width: 100%;
  max-width: 400px;
}

h1 {
  margin-bottom: 1rem;
  color: #333;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-align: left;
}

label {
  font-weight: bold;
  margin-bottom: 0.25rem;
  color: #444;
}

input, select, button {
  padding: 0.75rem;
  font-size: 1rem;
  border-radius: 8px;
  border: 1px solid #ccc;
}

button {
  background-color: #0078d4;
  color: white;
  border: none;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background-color: #005fa3;
}

#qrOutput.centered {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
}

#downloadBtn {
  margin-top: 1rem;
}