TikZ arrows pointing only to the superscript exponent

Question

Here's what I've got at the moment:

\begin{frame}


\frametitle{Nazewnictwo}

\tikzstyle{na} = [baseline=-.5ex]
\large

\[
\tikz[baseline]{\node[fill=blue!20,anchor=base] (t1){\Huge{$a$}};}
 \tikz[baseline]{\node[fill=red!20,anchor=base ] (t2){\Huge{$^n$}};}
\]

  \begin{itemize}
 \item[]<2-> \tikz\node [fill=blue!50,draw,circle] (n1) {}; podstawa
  \item[]<3-> \tikz\node [fill=red!50,draw,circle] (n2) {}; wykładnik
   \end{itemize}

    \begin{tikzpicture}[overlay]
     \path<4->[blue,->] (n1.north) edge [out= 60, in= 135] (t1.north west);
    \path<5>[red,->] (n2.south) edge [out=-70, in=-110] (t2.south);

       \end{tikzpicture}
   \end{frame}

Which looks like this:

And that's what I would like to have:

Is there any way in which I can make the arrow point directly to the exponent and the highlighted red rectangle adequately smaller as in the 2nd picture?

Answer 1

You don't need to make the node written as a superscript to make it look like it. The math font size command \scriptstyle is actually does it for you together with \displaystyle,\scriptscriptstyle etc.

Also you can put the item disks as an argument to \item macro. Lastly, you need to remember those pictures.

\documentclass{beamer}
\usepackage{tikz,lmodern}
\tikzstyle{na} = [baseline=-.5ex,remember picture]
\begin{document}

\begin{frame}{Nazewnictwo}

\large

\[
\tikz[baseline,remember picture]{
\node[fill=blue!20,anchor=base] (t1){\Huge{$a$}};
\node[fill=red!20,anchor=west] at (t1.north east) (t2){\Huge{$\scriptstyle n$}};
}
\]

  \begin{itemize}
 \item[{\tikz[na]{\node [fill=blue!50,draw,circle] (n1) {};}}]<2->  podstawa
 \item[{\tikz[na]{\node [fill=red!50,draw,circle ] (n2) {};}}]<3->  wykładnik
   \end{itemize}

\begin{tikzpicture}[remember picture,overlay]
     \path<4->[blue,->] (n1.north) edge [out= 60, in= 135] (t1.north west);
    \path<5>[red,->] (n2.south) edge [out=-70, in=-110] (t2.south);

\end{tikzpicture}
\end{frame}

\end{document}