body {
  font-family: Arial, sans-serif;
  max-width: 400px;
  margin: 30px auto;
  text-align: center;
}

h2 {
  color: #000;
}

.input-row {
  margin-bottom: 12px;
}

label {
  display: block;
  margin-bottom: 4px;
}

input[type="text"], input[type="number"] {
  width: 100%;
  padding: 8px;
  font-size: 16px;
}

#qrcode {
  margin: 20px 0;
}

.placeholder {
  width: 220px;
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed #bbb;
  color: #aaa;
  margin: 0 auto;
}

button {
  padding: 10px 30px;
  border: none;
  border-radius: 5px;
  background: #97005b;
  color: white;
  font-size: 16px;
  cursor: pointer;
  margin-top: 16px;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.note {
  font-size: 12px;
  color: #888;
  margin-top: 16px;
}

a {
  color: #97005b;
}