*{margin:0;padding:0;box-sizing:border-box}:root{--primary:#1e40af;--primary-light:#3b82f6;--primary-dark:#1e3a8a;--bg:#f8fafc;--bg-card:#fff;--text:#0f172a;--text-muted:#64748b;--border:#e2e8f0;--user-bubble:#1e40af;--assistant-bubble:#f1f5f9;--error:#dc2626;--success:#16a34a}body{font-family:Inter,Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}button,input,textarea{font-family:inherit}input:focus,textarea:focus{outline:none;border-color:var(--primary-light);box-shadow:0 0 0 3px rgba(59,130,246,.15)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:3px}