body {
  margin: 0;
  padding: 0;
  background: linear-gradient(145deg, #1f1f1f, #111);
  color: #fff;
  font-family: 'Segoe UI', sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  max-width: 400px;
  margin: auto;
  padding: 40px 20px;
  text-align: center;
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: #00f0ff;
}

input[type="text"] {
  width: 100%;
  padding: 12px 15px;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  background-color: #222;
  color: #fff;
  outline: none;
  margin-bottom: 20px;
  box-shadow: inset 2px 2px 6px #000, inset -2px -2px 6px #333;
}

button, a {
  padding: 12px 20px;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  margin: 10px 5px;
  cursor: pointer;
  transition: 0.3s;
  background-color: #00f0ff;
  color: #000;
  text-decoration: none;
}

button:hover, a:hover {
  background-color: #00c0cc;
}

.qr-container {
  margin-top: 20px;
}

canvas {
  background-color: white;
  padding: 12px;
  border-radius: 16px;
  box-shadow: 0 0 25px #00f0ff80;
}

.btn-group {
  margin-top: 20px;
}

footer {
  text-align: center;
  padding: 20px;
  font-size: 0.9rem;
  color: #888;
}