:root{color-scheme:light;--bg:#ffffff;--text:#0f172a;--muted:#64748b;--border:#e2e8f0;--panel:#f8fafc;--blue:#2563eb;--green:#16a34a;--user:#dbeafe;--assistant:#f1f5f9;--error-bg:#fef2f2;--error-border:#fecaca;--error-text:#991b1b}body,html{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,Noto Sans,Liberation Sans,sans-serif}button,input,textarea{font:inherit}