feat: Create initial UI for DP Visualizer

frontend/src/pages/DPVisualizer.jsx

@@ -1,28 +1,109 @@
 import React, { useState } from 'react';
-import { useTheme } from '../contexts/ThemeContext';
+import { Play, RotateCcw, Puzzle, Hash } from 'lucide-react';
 
 const DPVisualizer = () => {
-  const { classes, getThemedGradient } = useTheme();
-  const [algorithm, setAlgorithm] = useState('lcs');
-
+  const [selectedProblem, setSelectedProblem] = useState('fibonacci');
+  const [inputValue, setInputValue] = useState(8); // Example: n for Fibonacci
+
+  const handleVisualize = () => console.log('Visualize clicked!', { selectedProblem, inputValue });
+  const handleReset = () => {
+    setInputValue(0);
+    console.log('Reset clicked!');
+  };
+
   return (
-    <div className={`min-h-screen transition-all duration-500 py-8 ${classes.bgGradient}`}>
-      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 space-y-6">
-        <div className={`${classes.cardBg} border rounded-xl shadow-soft p-6`}>
-          <h1 className={`text-3xl font-bold ${classes.textPrimary} mb-2`}>
-            Dynamic Programming Visualizer
-          </h1>
-          <p className={classes.textSecondary}>
-            Visualize dynamic programming algorithms and optimization problems
-          </p>
-        </div>
+    <div className="w-full min-h-screen bg-slate-50 p-4 sm:p-8">
+      {/* Spacer div */}
+      <div className="h-24"></div>
+
+      {/* 1. Gradient Header Card */}
+      <div className="max-w-7xl mx-auto p-6 mb-8 bg-gradient-to-r from-blue-500 to-purple-600 rounded-xl shadow-lg">
+        <h1 className="text-4xl font-bold text-white tracking-tight">
+          Dynamic Programming Visualizer
+        </h1>
+        <p className="mt-2 text-blue-100">
+          Visualize dynamic programming algorithms and optimization problems.
+        </p>
+      </div>
+
+      <div className="max-w-7xl mx-auto grid grid-cols-1 lg:grid-cols-3 gap-8">
 
-        <div className={`${classes.cardBg} border rounded-xl shadow-soft p-6`}>
-          <p className={classes.textSecondary}>DP visualizer coming soon...</p>
+        {/* 2. Left Column: Inputs & Controls Card */}
+        <div className="lg:col-span-1">
+          <div className="bg-white p-6 rounded-xl shadow-md border border-slate-200">
+            <h2 className="text-xl font-bold text-slate-800 mb-6 flex items-center gap-2">
+              <Puzzle size={22} className="text-indigo-500" />
+              Problem & Controls
+            </h2>
+
+            {/* Problem Selection */}
+            <div className="mb-4">
+              <label htmlFor="dp-problem" className="block text-sm font-medium text-slate-600 mb-2">
+                Select a Problem
+              </label>
+              <select
+                id="dp-problem"
+                value={selectedProblem}
+                onChange={(e) => setSelectedProblem(e.target.value)}
+                className="w-full p-3 bg-slate-100 text-slate-800 rounded-lg border border-slate-300 focus:outline-none focus:ring-2 focus:ring-indigo-500"
+              >
+                <option value="fibonacci">Fibonacci Sequence</option>
+                <option value="knapsack">0/1 Knapsack</option>
+                <option value="lcs">Longest Common Subsequence</option>
+              </select>
+            </div>
+
+            {/* Conditional Inputs based on selected problem */}
+            <div className="mb-6">
+              <label htmlFor="main-input" className="block text-sm font-medium text-slate-600 mb-2">
+                Input (n)
+              </label>
+              <input
+                id="main-input"
+                type="number"
+                value={inputValue}
+                onChange={(e) => setInputValue(Number(e.target.value))}
+                className="w-full p-3 bg-slate-100 text-slate-800 placeholder-slate-400 rounded-lg border border-slate-300 focus:outline-none focus:ring-2 focus:ring-indigo-500 transition"
+                placeholder="Enter a number..."
+              />
+            </div>
+
+            {/* Buttons */}
+            <div className="flex flex-col sm:flex-row gap-4">
+              <button
+                onClick={handleVisualize}
+                className="flex flex-1 items-center justify-center gap-2 bg-indigo-600 hover:bg-indigo-700 text-white font-semibold py-3 px-4 rounded-lg transition-transform transform hover:scale-105 shadow-md"
+              >
+                <Play size={20} />
+                Visualize
+              </button>
+              <button
+                onClick={handleReset}
+                className="flex flex-1 items-center justify-center gap-2 bg-slate-500 hover:bg-slate-600 text-white font-semibold py-3 px-4 rounded-lg transition-transform transform hover:scale-105 shadow-md"
+              >
+                <RotateCcw size={20} />
+                Reset
+              </button>
+            </div>
+          </div>
         </div>
+
+        {/* 3. Right Column: Display Area Card */}
+        <div className="lg:col-span-2">
+          <div className="bg-white p-6 rounded-xl shadow-md border border-slate-200 min-h-[300px]">
+            <h2 className="text-xl font-bold text-slate-800 mb-6 flex items-center gap-2">
+              <Hash size={22} className="text-indigo-500" />
+              Visualization
+            </h2>
+            <div className="p-4 bg-slate-100 rounded-lg text-center text-slate-500">
+              The visualization area for the {selectedProblem} problem will appear here.
+            </div>
+          </div>
+        </div>
+
       </div>
     </div>
   );
 };
 
-export default DPVisualizer;
+export default DPVisualizer;