:root{--primary-color:#3b82f6;--primary-hover:#2563eb;--bg-color:#f8fafc;--surface-color:#fff;--text-primary:#1e293b;--text-secondary:#64748b;--border-color:#e2e8f0;--error-color:#ef4444;--error-bg:#fef2f2}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-primary);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}input,button{font-family:inherit}