Implemented a more robust algorithm to select a contrasting color based on distance from the original color.

public/app.js

@@ -401,14 +401,25 @@ function rgbToHex(rgb) {
 
 function getContrastingColor(hexColor) {
   const nodeColor = hexToRgb(hexColor);
-  const black = { r: 0, g: 0, b: 0 };
+  const options = [
+    { name: 'cyan', color: { r: 0, g: 255, b: 255 } },
+    { name: 'bright pink', color: { r: 255, g: 20, b: 147 } },
+    { name: 'bright green', color: { r: 0, g: 255, b: 0 } },
+    { name: 'white', color: { r: 255, g: 255, b: 255 } }
+  ];
   
-  // Calculate the color that's 70% away from the node color and 30% away from black
-  const r = Math.round(nodeColor.r * 0.3 + (255 - nodeColor.r) * 0.7);
-  const g = Math.round(nodeColor.g * 0.3 + (255 - nodeColor.g) * 0.7);
-  const b = Math.round(nodeColor.b * 0.3 + (255 - nodeColor.b) * 0.7);
+  let bestColor = options[0];
+  let maxDistance = 0;
   
-  return rgbToHex({ r, g, b });
+  options.forEach(option => {
+    const distance = colorDistance(nodeColor, option.color);
+    if (distance > maxDistance) {
+      maxDistance = distance;
+      bestColor = option;
+    }
+  });
+  
+  return rgbToHex(bestColor.color);
 }
 
 function colorDistance(rgb1, rgb2) {