:root {
  --primary-color: #007bff;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --error-color: #dc3545;
  --background-color: #f8f9fa;
  --text-color: #212529;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
}

#app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.container {
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  margin-bottom: 2rem;
}

h1, h2, h3 {
  margin-bottom: 1rem;
  color: var(--text-color);
}

button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.2s;
}

button:hover {
  background-color: #0056b3;
}

button:disabled {
  background-color: var(--secondary-color);
  cursor: not-allowed;
}

.error {
  color: var(--error-color);
  margin: 1rem 0;
}

.success {
  color: var(--success-color);
  margin: 1rem 0;
}