body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 20px;
  background-color: #f4f4f4;
  color: #333;
}

h1 {
  text-align: center;
  color: #2c3e50;
}

input[type="file"] {
  display: block;
  margin: 20px auto;
  padding: 10px;
  border: 2px dashed #3498db;
  border-radius: 5px;
  background-color: #ecf0f1;
  cursor: pointer;
}

label[for="pdfInput"] {
  display: block;
  text-align: center;
  font-weight: bold;
  color: #2c3e50;
  margin-bottom: 10px;
}

.page-navigation {
  text-align: center;
  margin: 10px 0;
}

.page-navigation button {
  margin: 0 5px;
  padding: 8px 12px;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 3px;
  cursor: pointer;
}

.page-navigation button:disabled {
  background-color: #bdc3c7;
  cursor: not-allowed;
}

.page-navigation span {
  margin: 0 10px;
  font-weight: bold;
}

.canvas-container {
  text-align: center;
  margin: 20px 0;
  overflow-x: auto;
}

#pdfCanvas {
  border: 1px solid #ddd;
  max-width: 100%;
  height: auto;
}

.button-group {
  text-align: center;
  margin: 20px 0;
}

.button-group button {
  margin: 0 10px;
  padding: 10px 15px;
  background-color: #e74c3c;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
}

.button-group button:hover {
  background-color: #c0392b;
}

#qrResult {
  margin-top: 20px;
  padding: 15px;
  background-color: #ecf0f1;
  border-radius: 5px;
  text-align: center;
  font-size: 18px;
  font-weight: bold;
}

/* Mobile styles */
@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  h1 {
    font-size: 24px;
  }

  .page-navigation button {
    padding: 6px 10px;
    font-size: 14px;
  }

  .button-group button {
    display: block;
    width: 100%;
    margin: 10px 0;
    padding: 12px;
  }

  #pdfCanvas {
    max-width: 100%;
    height: auto;
  }

  #qrResult {
    font-size: 16px;
  }
}