body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f0f0;
  color: #333;
  margin: 0;
  padding: 0;
  transition: background 0.3s, color 0.3s;
}

body.dark {
  background: #1e1e1e;
  color: #fff;
}

.container {
  max-width: 600px;
  margin: auto;
  padding: 2rem;
  text-align: center;
}

h1 {
  margin-bottom: 1rem;
}

.form input[type="text"] {
  width: 100%;
  padding: 10px;
  font-size: 16px;
  margin-bottom: 1rem;
}

.settings {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.settings label {
  margin: 5px;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
  margin-top: 10px;
}

#qrOutput canvas {
  margin-top: 20px;
  border: 1px solid #ccc;
}

.theme-toggle {
  text-align: right;
  margin-bottom: 1rem;
}

@media (max-width: 600px) {
  .settings {
    flex-direction: column;
    align-items: center;
  }
}