* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #4facfe, #00f2fe);
  padding: 20px;
}

.box {
  background: #fff;
  padding: 30px 25px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  text-align: center;
  width: 100%;
  max-width: 400px;
}

.box h2 {
  margin-bottom: 20px;
  color: #333;
}

.box input {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid #ccc;
  border-radius: 8px;
  margin-bottom: 15px;
  font-size: 16px;
  transition: border-color 0.3s;
}

.box input:focus {
  border-color: #4facfe;
  outline: none;
}

.box button {
  width: 100%;
  padding: 12px;
  background: #4facfe;
  border: none;
  color: #fff;
  font-size: 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s;
}

.box button:hover {
  background: #00c6fb;
}

#qrBox {
  margin-top: 20px;
}