diff --git a/fig/fig0_overview2.pdf b/fig/fig0_overview2.pdf
index aa31fba..25ac334 100755
Binary files a/fig/fig0_overview2.pdf and b/fig/fig0_overview2.pdf differ
diff --git a/fig/fig0_overview2_tikz.tex b/fig/fig0_overview2_tikz.tex
index 27df9eb..21e34cf 100755
--- a/fig/fig0_overview2_tikz.tex
+++ b/fig/fig0_overview2_tikz.tex
@@ -5,11 +5,11 @@
 \begin{tikzpicture}[
   font=\small,
   box/.style={draw,rounded corners=1pt,minimum width=7.5mm,minimum height=5.5mm,inner sep=1.5pt},
-  enc/.style={box,fill=yellow!35},
+  enc/.style={box},
   chan/.style={draw,diamond,aspect=1.4,fill=gray!25,inner sep=0.8pt},
   rxb/.style={box},
   mult/.style={draw,circle,inner sep=0.4pt,minimum size=4mm},
-  sum/.style={draw,rounded corners=2.5mm,fill=cyan!20,minimum width=12mm,minimum height=36mm},
+  sum/.style={draw,rounded corners=2.5mm,fill=gray!15,minimum width=12mm,minimum height=36mm},
   dec/.style={draw,rounded corners=2pt,minimum width=53mm,minimum height=6mm,inner sep=2pt},
   lbl/.style={font=\small\bfseries,align=center},
   arr/.style={-stealth,semithick}]
@@ -54,16 +54,16 @@
 \node[lbl] at ([yshift=-4.5mm]sig.south) {Received Signal\\(Superposition $\tilde{\mathbf{y}}$)};
 
 % ---------------- right panel: UWCA decoder ----------------
-\node[dec,fill=violet!15,right=26mm of sig.east,yshift=19mm] (mask)
+\node[dec,fill=gray!15,right=26mm of sig.east,yshift=19mm] (mask)
   {Soft Masks $\{\tilde{\mathbf{m}}_i\}_{i=1}^{U}$};
-\node[dec,fill=blue!12,below=2.2mm of mask,align=center] (proj)
+\node[dec,fill=gray!15,below=2.2mm of mask,align=center] (proj)
   {K/V Projection $(\mathbf{W}_K,\mathbf{W}_V)$\\[-1pt] Queries $\{\mathbf{q}_u\}$};
-\node[dec,fill=orange!30,below=2.2mm of proj,minimum height=9mm,align=center] (attn)
+\node[dec,fill=gray!30,below=2.2mm of proj,minimum height=9mm,align=center] (attn)
   {Scaled Dot-Product Attention\\[-1pt]
    {\footnotesize $\alpha_{u,i}=\mathrm{softmax}\big(\eta\,\mathbf{q}_u^{\top}\mathbf{k}_i/\sqrt{d_k}\big)$}};
 \node[mult,below=2.2mm of attn] (plus) {$\oplus$};
-\node[dec,fill=green!20,below=2.2mm of plus] (norm) {$\ell_2$-Normalize};
-\node[dec,fill=green!30,below=2.2mm of norm] (out)
+\node[dec,fill=gray!15,below=2.2mm of plus] (norm) {$\ell_2$-Normalize};
+\node[dec,fill=gray!15,below=2.2mm of norm] (out)
   {$\hat{\mathbf{e}}_1,\ \hat{\mathbf{e}}_2,\ \ldots,\ \hat{\mathbf{e}}_U$};
 \draw[arr] (mask) -- (proj);
 \draw[arr] (proj) -- (attn);
@@ -71,21 +71,21 @@
 \draw[arr] (plus) -- (norm);
 \draw[arr] (norm) -- (out);
 \draw[arr] (sig.east) -- node[above,pos=0.45,font=\small]{$\tilde{\mathbf{y}}$} ++(13mm,0) |- (mask.west);
-\draw[arr,dashed,blue] (mask.east) -- ++(4mm,0) |- (plus.east)
+\draw[arr,dashed] (mask.east) -- ++(4mm,0) |- (plus.east)
   node[pos=0.78,above,font=\footnotesize]{skip: $\tilde{\mathbf{y}}\odot\tilde{\mathbf{m}}_u$};
 
 % decoder panel frame
 \begin{scope}[on background layer]
-\node[rounded corners=2mm,fill=gray!12,fit=(mask)(out)(attn),
+\node[rounded corners=2mm,fill=gray!7,fit=(mask)(out)(attn),
       inner xsep=7mm,inner ysep=4.5mm] (panel) {};
 \end{scope}
 \node[anchor=south,font=\small\bfseries\color{black!75},inner sep=2pt] at (panel.north)
   {UWCA Decoder (per-user, shared weights $\theta$)};
 
 % MAML brace
-\draw[decorate,decoration={brace,mirror,amplitude=2mm},blue!60!black,thick]
+\draw[decorate,decoration={brace,mirror,amplitude=2mm},black!75,thick]
   ([yshift=-1.5mm]panel.south west) -- ([yshift=-1.5mm]panel.south east)
-  node[midway,below=2mm,font=\small\color{blue!60!black}]
+  node[midway,below=2mm,font=\small\color{black!75}]
   {MAML meta-training over SNR tasks $\{\mathcal{T}_k\}_{k=1}^{K}$};
 \end{tikzpicture}
 \end{document}