tikz 节点的颜色不起作用

Question

我有以下图表，我的目标是将黑色标签变为橙色。在 Overleaf 中，这完全正常，文本为橙色，但当我插入完全相同的代码时，它显示如下图所示。

\tikzstyle{node_network}=[circle, draw, thin,fill=yellow!50, scale=0.8]
\tikzstyle{node_functional}=[rectangle, draw, thin,fill=orange!70, scale=0.8]
\tikzstyle{node_traffic}=[circle, draw, thin,fill=blue!70, scale=0.8]

\begin{tikzpicture}[auto, thick]
    \node[text=orange,scale=0.6] (u_1) at (0.5,2.75) {$u_1$};
    \node[text=orange,scale=0.6] (u_2) at (-0.8,0.5) {$u_2$};
    \node[text=orange,scale=0.6] (u_3) at (1.8,0.5) {$u_3$};
 
    \node[text=orange,scale=0.6] (f1) at (-2.0,2.5) {$f_1$};
    \node[text=orange,scale=0.6] (f2) at (-1.4,1.95) {$f_2$};
    \node[text=orange,scale=0.6] (f3) at (-0.5,0.95) {$f_3$};
     \node[text=orange,scale=0.6] (f4) at (1.25,1.85) {$f_4$};
 % Functional layer nodes
  \foreach \place/\i in 
  {{(-3,2.0)/1},
    {(-0.8,0.75)/2},
    {(1.8,0.75)/3},
    {(0.5,2.5)/4},
    {(3.75,2.0)/5}}
    \node[node_functional] (b\i) at \place {};
    
 % Functional layer links
  \path[thin] (b1) edge (b2);
  \path[thick, orange] (b1) edge (b4) ;
  \path[thick, orange] (b2) edge (b3);
  \path[thin] (b3) edge (b4);
  \path[thick, orange] (b3) edge (b5);
  \path[thin] (b4) edge (b5);
  \path[thick, orange] (b4) edge (b2);
  
    \path[thin, dashed, orange!30] (f1) edge (b1);
    \path[thin, dashed, orange!30] (f1) edge (b4);
    \path[thin, dashed, orange!30] (f2) edge (b2);
    \path[thin, dashed, orange!30] (f2) edge (b4);
    \path[thin, dashed, orange!30] (f3) edge (b2);
    \path[thin, dashed, orange!30] (f3) edge (b3);
    \path[thin, dashed, orange!30] (f4) edge (b5);
    \path[thin, dashed, orange!30] (f4) edge (b3);
\end{tikzpicture}

有人知道如何永久设置文本为特定颜色吗？