:root {
  --primary-color: #007bff;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --background-color: #f8f9fa;
  --border-color: #dee2e6;
  --text-color: #212529;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 350px;
  min-height: 400px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
}

.container {
  padding: 20px;
}

h1 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--primary-color);
}

.description {
  font-size: 14px;
  color: var(--secondary-color);
  margin-bottom: 20px;
}

.content {
  margin-bottom: 20px;
}

.btn {
  display: inline-block;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}

.btn-primary {
  color: white;
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-primary:hover {
  background-color: #0056b3;
  border-color: #0056b3;
}

.result {
  margin-top: 15px;
  padding: 10px;
  background-color: white;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 14px;
  min-height: 20px;
}

.result.success {
  border-color: var(--success-color);
  color: var(--success-color);
}

.result.error {
  border-color: #dc3545;
  color: #dc3545;
}

footer {
  text-align: center;
  margin-top: auto;
  padding-top: 20px;
}

footer small {
  color: var(--secondary-color);
  font-size: 12px;
}