Improve slider appearance

Make slider endpoints symmetric and colored.

src/components/BalancedTernaryGame.tsx

@@ -2,7 +2,7 @@ import React, { useState, useEffect, useCallback } from 'react';
 import { Button } from '@/components/ui/button';
 import { Card, CardContent } from '@/components/ui/card';
 import { Badge } from '@/components/ui/badge';
-import { Slider } from '@/components/ui/slider';
+import { RangeSlider } from '@/components/ui/range-slider';
 import { Label } from '@/components/ui/label';
 import { Plus, Minus } from 'lucide-react';
 import SocialShare from '@/components/SocialShare';
@@ -194,7 +194,7 @@ const BalancedTernaryGame: React.FC<BalancedTernaryGameProps> = ({ showSocialSha
                   <div className="w-3 h-3 bg-primary rounded-full"></div>
                 </div>
               </div>
-              <Slider
+              <RangeSlider
                 value={targetRange}
                 onValueChange={(value) => {
                   // Snap to multiples of 10 if close enough

src/components/TernaryNumberGame.tsx

@@ -2,7 +2,7 @@ import React, { useState, useEffect, useCallback } from 'react';
 import { Button } from '@/components/ui/button';
 import { Card, CardContent } from '@/components/ui/card';
 import { Badge } from '@/components/ui/badge';
-import { Slider } from '@/components/ui/slider';
+import { RangeSlider } from '@/components/ui/range-slider';
 import { Label } from '@/components/ui/label';
 import SocialShare from '@/components/SocialShare';
 
@@ -145,7 +145,7 @@ const TernaryNumberGame: React.FC<TernaryNumberGameProps> = ({ showSocialShare =
                   <div className="w-3 h-3 bg-primary rounded-full"></div>
                 </div>
               </div>
-              <Slider
+              <RangeSlider
                 value={targetRange}
                 onValueChange={(value) => {
                   // Snap to multiples of 10 if close enough

src/components/ui/range-slider.tsx

@@ -0,0 +1,29 @@
+import * as React from "react"
+import * as SliderPrimitive from "@radix-ui/react-slider"
+
+import { cn } from "@/lib/utils"
+
+const RangeSlider = React.forwardRef<
+  React.ElementRef<typeof SliderPrimitive.Root>,
+  React.ComponentPropsWithoutRef<typeof SliderPrimitive.Root>
+>(({ className, ...props }, ref) => (
+  <SliderPrimitive.Root
+    ref={ref}
+    className={cn(
+      "relative flex w-full touch-none select-none items-center",
+      className
+    )}
+    {...props}
+  >
+    <SliderPrimitive.Track className="relative h-2 w-full grow overflow-hidden rounded-full bg-secondary">
+      <SliderPrimitive.Range className="absolute h-full bg-primary" />
+    </SliderPrimitive.Track>
+    {/* First thumb (left/min) - Blue */}
+    <SliderPrimitive.Thumb className="block h-5 w-5 rounded-full border-2 border-blue-500 bg-blue-500 ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-400 focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50" />
+    {/* Second thumb (right/max) - Red */}
+    <SliderPrimitive.Thumb className="block h-5 w-5 rounded-full border-2 border-red-500 bg-red-500 ring-offset-background transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-red-400 focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50" />
+  </SliderPrimitive.Root>
+))
+RangeSlider.displayName = SliderPrimitive.Root.displayName
+
+export { RangeSlider }