*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}:root{--primary-color: #667eea;--secondary-color: #764ba2;--success-color: #48bb78;--danger-color: #f56565;--warning-color: #ed8936;--text-color: #333;--border-color: #ddd}