body {
  font-family: sans-serif;
  background: #f5f5f5;
  padding: 20px;
  max-width: 500px;
  margin: auto;
}
.card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  margin-bottom: 20px;
}
button {
  width: 100%;
  padding: 15px;
  margin-top: 10px;
  background: #ff5722;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 18px;
  cursor: pointer;
}
button:disabled {
  background: #ccc;
  cursor: not-allowed;
}
.address {
  word-break: break-word;
  color: #555;
}
#copy-alert {
  color: green;
  font-weight: bold;
  margin-top: 10px;
}