body {
  font-family: "Segoe UI", "PingFang SC", sans-serif;
  margin: 0;
  padding: 0;
  background-color: #fafafa;
  color: #333;
  text-align: center;
}

header {
  background-color: #f4f4f4;
  padding: 2rem 1rem;
  border-bottom: 1px solid #ddd;
}

h1 {
  margin-bottom: 0.5rem;
}

main {
  padding: 2rem 1rem;
}

.actions {
  margin: 2rem 0;
}

.btn, button {
  display: inline-block;
  background-color: #4CAF50;
  color: white;
  border: none;
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  margin: 0.5rem;
  transition: background-color 0.3s;
}

.btn:hover, button:hover {
  background-color: #45a049;
}

.qr {
  width: 250px;
  height: 250px;
  border: 2px solid #ccc;
  border-radius: 10px;
  margin: 1rem auto;
}

footer {
  background-color: #f4f4f4;
  padding: 1rem;
  border-top: 1px solid #ddd;
  font-size: 0.9rem;
  color: #777;
}