submit ux improvements

frontend/src/components/editor/problem-workspace.tsx

@@ -1,10 +1,11 @@
 "use client";
 
-import { useState, useCallback, useMemo } from "react";
+import { useState, useCallback, useMemo, useEffect } from "react";
 import { CodeEditor } from "./code-editor";
 import { TestResults } from "./test-results";
 import { usePyodide } from "@/hooks/use-pyodide";
 import { submitSolution } from "@/lib/api";
+import { markQuestionCompleted, getSavedSolution, isQuestionCompleted } from "@/lib/progress";
 import type { QuestionDetail, TestResult, HiddenTestOutput } from "@/types";
 import { Badge } from "@/components/ui/badge";
 import { Markdown } from "@/components/ui/markdown";
@@ -12,6 +13,19 @@ import { CodeBlock } from "@/components/ui/code-block";
 import { Callout, ApproachBox } from "@/components/ui/callout";
 import { Collapsible } from "@/components/ui/collapsible";
 import { getDifficultyVariant, capitalize } from "@/lib/utils";
+import {
+  detectProblemType,
+  TREE_NODE_CLASS,
+  LIST_NODE_CLASS,
+  BUILD_TREE,
+  TREE_TO_ARRAY,
+  BUILD_LIST,
+  LIST_TO_ARRAY,
+} from "@/lib/python-helpers";
+import {
+  COMPLEXITY_ANALYZER,
+  type ComplexityResult,
+} from "@/lib/complexity-analyzer";
 import {
   FileText,
   BookOpen,
@@ -24,6 +38,13 @@ import {
   Play,
   Send,
   Loader2,
+  PanelLeftClose,
+  PanelRightClose,
+  Columns2,
+  Gauge,
+  ChevronRight,
+  CheckCircle,
+  XCircle,
 } from "lucide-react";
 import Link from "next/link";
 
@@ -38,19 +59,60 @@ interface ExecutionResult {
 }
 
 function extractFunctionName(signature: string): string {
-  const match = signature.match(/def\s+(\w+)\s*\(/);
-  return match ? match[1] : "solution";
+  // Check for class-based signature: "class MinStack" -> "MinStack"
+  const classMatch = signature.match(/class\s+(\w+)/);
+  if (classMatch) return classMatch[1];
+
+  // Function: "def two_sum(" -> "two_sum"
+  const funcMatch = signature.match(/def\s+(\w+)\s*\(/);
+  return funcMatch ? funcMatch[1] : "solution";
 }
 
 function generateStarterCode(signature: string): string {
+  // Class-based problems need a different starter template
+  if (signature.startsWith("class ")) {
+    return `${signature}:
+    def __init__(self):
+        # Initialize your data structure here
+        pass
+`;
+  }
+
   return `${signature}
     # Write your solution here
     pass
 `;
 }
 
-type LeftTab = "problem" | "explanation";
+/**
+ * Compare actual and expected outputs with flexible matching.
+ * Handles unordered array comparison for problems like subsets.
+ */
+function compareOutputs(actual: unknown, expected: unknown): boolean {
+  // Direct equality check
+  if (JSON.stringify(actual) === JSON.stringify(expected)) {
+    return true;
+  }
+
+  // Handle unordered array comparison (e.g., subsets, word-break-ii)
+  if (Array.isArray(actual) && Array.isArray(expected)) {
+    if (actual.length !== expected.length) {
+      return false;
+    }
+    // Sort both arrays by their JSON string representation for comparison
+    const sortFn = (a: unknown, b: unknown) =>
+      JSON.stringify(a).localeCompare(JSON.stringify(b));
+    const sortedActual = [...actual].sort(sortFn);
+    const sortedExpected = [...expected].sort(sortFn);
+    return JSON.stringify(sortedActual) === JSON.stringify(sortedExpected);
+  }
+
+  return false;
+}
+
+type LeftTab = "problem" | "explanation" | "solutions";
 type RightTab = "code" | "results";
+type ViewMode = "split" | "left" | "right";
 
 export function ProblemWorkspace({ question }: ProblemWorkspaceProps) {
   const starterCode = useMemo(
@@ -60,6 +122,7 @@ export function ProblemWorkspace({ question }: ProblemWorkspaceProps) {
   const [code, setCode] = useState(starterCode);
   const [leftTab, setLeftTab] = useState<LeftTab>("problem");
   const [rightTab, setRightTab] = useState<RightTab>("code");
+  const [viewMode, setViewMode] = useState<ViewMode>("split");
   const [hasRunTests, setHasRunTests] = useState(false);
 
   // Test execution state
@@ -69,6 +132,18 @@ export function ProblemWorkspace({ question }: ProblemWorkspaceProps) {
   const [visibleResults, setVisibleResults] = useState<TestResult[]>([]);
   const [hiddenPassedCount, setHiddenPassedCount] = useState(0);
   const [hiddenTotalCount, setHiddenTotalCount] = useState(0);
+  const [complexityResult, setComplexityResult] = useState<ComplexityResult | null>(null);
+  const [isComplexityExpanded, setIsComplexityExpanded] = useState(false);
+  const [isCompleted, setIsCompleted] = useState(false);
+
+  // Load saved solution and completion status on mount
+  useEffect(() => {
+    const saved = getSavedSolution(question.slug);
+    if (saved) {
+      setCode(saved);
+    }
+    setIsCompleted(isQuestionCompleted(question.slug));
+  }, [question.slug]);
 
   const functionName = useMemo(
     () => extractFunctionName(question.function_signature!),
@@ -88,9 +163,127 @@ export function ProblemWorkspace({ question }: ProblemWorkspaceProps) {
     setCode(starterCode);
   }, [starterCode]);
 
+  const toggleViewMode = useCallback((panel: "left" | "right") => {
+    setViewMode((current) => {
+      if (current === "split") {
+        return panel; // Maximize the clicked panel
+      }
+      return "split"; // Return to split view
+    });
+  }, []);
+
+  const signature = question.function_signature ?? "";
+
   const generateTestHarness = useCallback(
     (tests: Array<{ id: number; input: Record<string, unknown> }>) => {
+      // Use first test to detect problem type
+      const firstInput = tests[0]?.input ?? {};
+      const problemType = detectProblemType(signature, firstInput);
       const testsJson = JSON.stringify(tests);
+
+      if (problemType === "class-based") {
+        // Class-based harness: operations/args format
+        return `
+import json
+
+${code}
+
+__tests__ = json.loads('${testsJson.replace(/'/g, "\\'")}')
+__results__ = []
+
+for test in __tests__:
+    try:
+        operations = test["input"]["operations"]
+        arguments = test["input"]["args"]
+        outputs = []
+        instance = None
+        for op, args in zip(operations, arguments):
+            if instance is None:
+                # First operation is always the constructor
+                instance = globals()[op](*args)
+                outputs.append(None)
+            else:
+                method_result = getattr(instance, op)(*args)
+                outputs.append(method_result)
+        __results__.append({"test_id": test["id"], "output": outputs})
+    except Exception as e:
+        __results__.append({"test_id": test["id"], "output": None, "error": str(e)})
+
+json.dumps(__results__)
+`;
+      }
+
+      if (problemType === "tree") {
+        // Tree-based harness: convert arrays to TreeNode, convert result back
+        return `
+import json
+
+${TREE_NODE_CLASS}
+
+${BUILD_TREE}
+
+${TREE_TO_ARRAY}
+
+${code}
+
+__tests__ = json.loads('${testsJson.replace(/'/g, "\\'")}')
+__results__ = []
+
+for test in __tests__:
+    try:
+        processed = dict(test["input"])
+        # Convert tree parameters from array to TreeNode
+        for key in ["root", "tree", "p", "q"]:
+            if key in processed and isinstance(processed[key], list):
+                processed[key] = __build_tree(processed[key])
+        result = ${functionName}(**processed)
+        # Convert TreeNode result back to array
+        if isinstance(result, TreeNode):
+            result = __tree_to_array(result)
+        __results__.append({"test_id": test["id"], "output": result})
+    except Exception as e:
+        __results__.append({"test_id": test["id"], "output": None, "error": str(e)})
+
+json.dumps(__results__)
+`;
+      }
+
+      if (problemType === "linkedlist") {
+        // Linked list harness: convert arrays to ListNode, convert result back
+        return `
+import json
+
+${LIST_NODE_CLASS}
+
+${BUILD_LIST}
+
+${LIST_TO_ARRAY}
+
+${code}
+
+__tests__ = json.loads('${testsJson.replace(/'/g, "\\'")}')
+__results__ = []
+
+for test in __tests__:
+    try:
+        processed = dict(test["input"])
+        # Convert list parameters from array to ListNode
+        for key in ["head", "l1", "l2", "list1", "list2", "node"]:
+            if key in processed and isinstance(processed[key], list):
+                processed[key] = __build_list(processed[key])
+        result = ${functionName}(**processed)
+        # Convert ListNode result back to array
+        if isinstance(result, ListNode):
+            result = __list_to_array(result)
+        __results__.append({"test_id": test["id"], "output": result})
+    except Exception as e:
+        __results__.append({"test_id": test["id"], "output": None, "error": str(e)})
+
+json.dumps(__results__)
+`;
+      }
+
+      // Simple function harness (default)
       return `
 import json
 
@@ -109,7 +302,7 @@ for test in __tests__:
 json.dumps(__results__)
 `;
     },
-    [code, functionName]
+    [code, functionName, signature]
   );
 
   const runTests = useCallback(
@@ -138,12 +331,38 @@ json.dumps(__results__)
     [generateTestHarness, runPython]
   );
 
+  const analyzeComplexity = useCallback(
+    async (userCode: string) => {
+      const analyzerCode = `
+${COMPLEXITY_ANALYZER}
+
+import json
+__user_code = '''${userCode.replace(/'/g, "\\'")}'''
+__result = analyze_complexity(__user_code)
+json.dumps(__result)
+`;
+      const { output, error } = await runPython(analyzerCode);
+
+      if (error) {
+        return { success: false, error } as ComplexityResult;
+      }
+
+      try {
+        return JSON.parse(output as string) as ComplexityResult;
+      } catch {
+        return { success: false, error: "Failed to parse analysis" } as ComplexityResult;
+      }
+    },
+    [runPython]
+  );
+
   const handleRunTests = useCallback(async () => {
     if (!pyodide || isRunning) return;
 
     setIsRunning(true);
     setHiddenPassedCount(0);
     setHiddenTotalCount(0);
+    setComplexityResult(null);
 
     try {
       const tests = visibleTestCases.map((tc) => ({
@@ -155,8 +374,7 @@ json.dumps(__results__)
       const testResults: TestResult[] = results.map((r, idx) => {
         const testCase = visibleTestCases[idx];
         const passed =
-          !r.error &&
-          JSON.stringify(r.output) === JSON.stringify(testCase.expected);
+          !r.error && compareOutputs(r.output, testCase.expected);
 
         return {
           test_id: r.test_id,
@@ -170,16 +388,20 @@ json.dumps(__results__)
 
       setVisibleResults(testResults);
       setHasRunTests(true);
-      setRightTab("results");
+
+      // Run complexity analysis in the background
+      const complexity = await analyzeComplexity(code);
+      setComplexityResult(complexity);
     } finally {
       setIsRunning(false);
     }
-  }, [pyodide, isRunning, visibleTestCases, runTests]);
+  }, [pyodide, isRunning, visibleTestCases, runTests, analyzeComplexity, code]);
 
   const handleSubmit = useCallback(async () => {
     if (!pyodide || isSubmitting) return;
 
     setIsSubmitting(true);
+    setComplexityResult(null);
 
     try {
       // Run visible tests first
@@ -193,8 +415,7 @@ json.dumps(__results__)
         (r, idx) => {
           const testCase = visibleTestCases[idx];
           const passed =
-            !r.error &&
-            JSON.stringify(r.output) === JSON.stringify(testCase.expected);
+            !r.error && compareOutputs(r.output, testCase.expected);
 
           return {
             test_id: r.test_id,
@@ -232,6 +453,20 @@ json.dumps(__results__)
       setHiddenPassedCount(response.total_passed);
       setHiddenTotalCount(response.total_tests);
       setHasRunTests(true);
+
+      // Run complexity analysis in the background
+      const complexity = await analyzeComplexity(code);
+      setComplexityResult(complexity);
+
+      // Check if all tests passed
+      const allVisiblePassed = visibleTestResults.every((r) => r.passed);
+      const allHiddenPassed = response.total_passed === response.total_tests;
+      if (allVisiblePassed && allHiddenPassed) {
+        markQuestionCompleted(question.slug, code);
+        setIsCompleted(true);
+      }
+
+      // Auto-switch to Results tab after submit
       setRightTab("results");
     } catch (error) {
       console.error("Submission error:", error);
@@ -246,6 +481,7 @@ json.dumps(__results__)
     runTests,
     question.slug,
     code,
+    analyzeComplexity,
   ]);
 
   const isLoading = isRunning || isSubmitting;
@@ -253,7 +489,12 @@ json.dumps(__results__)
   return (
     <div className="fixed inset-0 top-[65px] flex bg-[var(--background)]">
       {/* Left panel - Problem description / Explanation */}
-      <div className="w-1/2 border-r border-[var(--border)] flex flex-col">
+      {viewMode !== "right" && (
+        <div
+          className={`${
+            viewMode === "left" ? "w-full" : "w-1/2"
+          } border-r border-[var(--border)] flex flex-col`}
+        >
           {/* Header - compact */}
           <div className="px-4 pt-3 pb-0">
             <div className="flex items-center justify-between gap-2 mb-2">
@@ -268,7 +509,14 @@ json.dumps(__results__)
                 <Badge variant={getDifficultyVariant(question.difficulty)} className="text-xs">
                   {capitalize(question.difficulty)}
                 </Badge>
+                {isCompleted && (
+                  <span className="flex items-center gap-1 text-xs text-green-500">
+                    <CheckCircle className="h-3.5 w-3.5" />
+                    Completed
+                  </span>
+                )}
               </div>
+              <div className="flex items-center gap-2">
                 {question.leetcode_url && (
                   <a
                     href={question.leetcode_url}
@@ -279,6 +527,18 @@ json.dumps(__results__)
                     LeetCode ↗
                   </a>
                 )}
+                <button
+                  onClick={() => toggleViewMode("left")}
+                  className="p-1.5 rounded hover:bg-[var(--accent)] text-[var(--muted-foreground)] hover:text-[var(--foreground)] transition-colors"
+                  title={viewMode === "left" ? "Split view" : "Maximize problem"}
+                >
+                  {viewMode === "left" ? (
+                    <Columns2 className="h-4 w-4" />
+                  ) : (
+                    <PanelRightClose className="h-4 w-4" />
+                  )}
+                </button>
+              </div>
             </div>
 
           <div className="flex flex-wrap gap-1.5 mb-2">
@@ -320,12 +580,22 @@ json.dumps(__results__)
             >
               Explanation
             </button>
+            <button
+              onClick={() => setLeftTab("solutions")}
+              className={`px-4 py-2 text-sm font-medium transition-colors border-b-2 -mb-px ${
+                leftTab === "solutions"
+                  ? "border-[var(--primary)] text-[var(--foreground)]"
+                  : "border-transparent text-[var(--muted-foreground)] hover:text-[var(--foreground)]"
+              }`}
+            >
+              Solutions
+            </button>
           </div>
         </div>
 
         {/* Tab content - scrollable */}
         <div className="flex-1 overflow-auto px-4 py-3">
-          {leftTab === "problem" ? (
+          {leftTab === "problem" && (
             <div className="space-y-6">
               {/* Problem */}
               <div>
@@ -381,7 +651,9 @@ json.dumps(__results__)
                 </div>
               )}
             </div>
-          ) : (
+          )}
+
+          {leftTab === "explanation" && (
             <div className="space-y-6">
               {/* Intuition */}
               {question.explanation?.intuition && (
@@ -474,14 +746,12 @@ json.dumps(__results__)
                   </div>
                 </div>
               )}
+            </div>
+          )}
 
-              {/* Solutions */}
-              {question.solutions && question.solutions.length > 0 && (
-                <div>
-                  <h2 className="flex items-center gap-2 text-lg font-semibold mb-3">
-                    <Code className="h-5 w-5" />
-                    Solutions
-                  </h2>
+          {leftTab === "solutions" && (
+            <div className="space-y-6">
+              {question.solutions && question.solutions.length > 0 ? (
                 <div className="space-y-4">
                   {question.solutions.map((solution, i) => {
                     const content = (
@@ -515,17 +785,36 @@ json.dumps(__results__)
                     );
                   })}
                 </div>
-                </div>
+              ) : (
+                <p className="text-[var(--muted-foreground)]">
+                  No solutions available for this problem yet.
+                </p>
               )}
             </div>
           )}
         </div>
       </div>
+      )}
 
       {/* Right panel - Editor and test results */}
-      <div className="w-1/2 flex flex-col">
+      {viewMode !== "left" && (
+        <div
+          className={`${viewMode === "right" ? "w-full" : "w-1/2"} flex flex-col`}
+        >
           {/* Tabs header */}
           <div className="px-4 pt-2 border-b border-[var(--border)] flex items-center justify-between">
+            <div className="flex items-center gap-2">
+              <button
+                onClick={() => toggleViewMode("right")}
+                className="p-1.5 rounded hover:bg-[var(--accent)] text-[var(--muted-foreground)] hover:text-[var(--foreground)] transition-colors"
+                title={viewMode === "right" ? "Split view" : "Maximize editor"}
+              >
+                {viewMode === "right" ? (
+                  <Columns2 className="h-4 w-4" />
+                ) : (
+                  <PanelLeftClose className="h-4 w-4" />
+                )}
+              </button>
               <div className="flex gap-1">
                 <button
                   onClick={() => setRightTab("code")}
@@ -538,7 +827,14 @@ json.dumps(__results__)
                   <Code className="h-4 w-4" />
                   Code
                 </button>
-            {hasRunTests && (
+                {hasRunTests && (() => {
+                  const visiblePassed = visibleResults.filter(r => r.passed).length;
+                  const visibleTotal = visibleResults.length;
+                  const allVisiblePassed = visibleTotal > 0 && visiblePassed === visibleTotal;
+                  const allHiddenPassed = hiddenTotalCount === 0 || hiddenPassedCount === hiddenTotalCount;
+                  const allPassed = allVisiblePassed && allHiddenPassed;
+
+                  return (
                     <button
                       onClick={() => setRightTab("results")}
                       className={`px-4 py-2 text-sm font-medium transition-colors border-b-2 -mb-px flex items-center gap-2 ${
@@ -547,10 +843,16 @@ json.dumps(__results__)
                           : "border-transparent text-[var(--muted-foreground)] hover:text-[var(--foreground)]"
                       }`}
                     >
-                <FileText className="h-4 w-4" />
+                      {allPassed ? (
+                        <CheckCircle className="h-4 w-4 text-green-500" />
+                      ) : (
+                        <XCircle className="h-4 w-4 text-red-500" />
+                      )}
                       Results
                     </button>
-            )}
+                  );
+                })()}
+              </div>
             </div>
             <button
               onClick={handleReset}
@@ -564,11 +866,130 @@ json.dumps(__results__)
         <div className="flex-1 min-h-0 flex flex-col">
           {rightTab === "code" ? (
             <>
-              {/* Editor - full height */}
+              {/* Editor */}
               <div className="flex-1 min-h-0">
                 <CodeEditor value={code} onChange={setCode} />
               </div>
 
+              {/* Complexity Analysis - shown after running tests */}
+              {complexityResult?.success && (
+                <div className="border-t border-[var(--border)] bg-[var(--secondary)]/50 px-4 py-2">
+                  <div className="flex items-center gap-2 text-sm">
+                    <Gauge className="h-4 w-4 text-[var(--primary)]" />
+                    <span className="font-medium">
+                      Estimated: {complexityResult.complexity}
+                    </span>
+                    {(complexityResult.details?.findings?.length ||
+                      complexityResult.details?.recursive_calls?.length) && (
+                      <button
+                        onClick={() => setIsComplexityExpanded(!isComplexityExpanded)}
+                        className="flex items-center gap-1 text-xs text-[var(--muted-foreground)] hover:text-[var(--foreground)] transition-colors ml-2"
+                      >
+                        <ChevronRight
+                          className={`h-3 w-3 transition-transform ${
+                            isComplexityExpanded ? "rotate-90" : ""
+                          }`}
+                        />
+                        Details
+                      </button>
+                    )}
+                  </div>
+
+                  {isComplexityExpanded && complexityResult.details && (
+                    <div className="mt-2 space-y-2 text-xs">
+                      {/* Loop findings */}
+                      {complexityResult.details.findings
+                        ?.filter((f) => f.type === "loop")
+                        .map((finding, i) => (
+                          <div key={`loop-${i}`} className="space-y-0.5">
+                            <div className="text-[var(--muted-foreground)]">
+                              {finding.kind === "for" ? (
+                                <>
+                                  Loop over {finding.iterates_over || "iterable"}
+                                  {finding.depth && finding.depth > 1
+                                    ? ` (nested, depth ${finding.depth})`
+                                    : ""}{" "}
+                                  → O(n)
+                                </>
+                              ) : (
+                                <>
+                                  While loop
+                                  {finding.depth && finding.depth > 1
+                                    ? ` (nested, depth ${finding.depth})`
+                                    : ""}
+                                </>
+                              )}
+                            </div>
+                            <div className="ml-3 flex items-center gap-2">
+                              <span className="text-[var(--muted-foreground)]/60 text-[10px]">
+                                L{finding.line}
+                              </span>
+                              <code className="bg-[var(--secondary)] px-1 rounded text-[var(--foreground)]/80">
+                                {finding.snippet}
+                              </code>
+                            </div>
+                          </div>
+                        ))}
+
+                      {/* Sort operations */}
+                      {complexityResult.details.findings
+                        ?.filter((f) => f.kind === "sort")
+                        .map((finding, i) => (
+                          <div key={`sort-${i}`} className="space-y-0.5">
+                            <div className="text-[var(--muted-foreground)]">
+                              Sorting operation → O(n log n)
+                            </div>
+                            <div className="ml-3 flex items-center gap-2">
+                              <span className="text-[var(--muted-foreground)]/60 text-[10px]">
+                                L{finding.line}
+                              </span>
+                              <code className="bg-[var(--secondary)] px-1 rounded text-[var(--foreground)]/80">
+                                {finding.snippet}
+                              </code>
+                            </div>
+                          </div>
+                        ))}
+
+                      {/* Linear search warnings */}
+                      {complexityResult.details.findings
+                        ?.filter((f) => f.kind === "linear_search")
+                        .map((finding, i) => (
+                          <div key={`search-${i}`} className="space-y-0.5">
+                            <div className="text-yellow-500">
+                              {finding.note || "Linear search in loop"}
+                            </div>
+                            <div className="ml-3 flex items-center gap-2">
+                              <span className="text-[var(--muted-foreground)]/60 text-[10px]">
+                                L{finding.line}
+                              </span>
+                              <code className="bg-[var(--secondary)] px-1 rounded text-[var(--foreground)]/80">
+                                {finding.snippet}
+                              </code>
+                            </div>
+                          </div>
+                        ))}
+
+                      {/* Recursive calls */}
+                      {complexityResult.details.recursive_calls?.map((call, i) => (
+                        <div key={`rec-${i}`} className="space-y-0.5">
+                          <div className="text-[var(--muted-foreground)]">
+                            Recursive call
+                          </div>
+                          <div className="ml-3 flex items-center gap-2">
+                            <span className="text-[var(--muted-foreground)]/60 text-[10px]">
+                              L{call.line}
+                            </span>
+                            <code className="bg-[var(--secondary)] px-1 rounded text-[var(--foreground)]/80">
+                              {call.snippet}
+                            </code>
+                          </div>
+                        </div>
+                      ))}
+                    </div>
+                  )}
+                </div>
+              )}
+
               {/* Action buttons */}
               <div className="p-3 border-t border-[var(--border)] flex items-center justify-between bg-[var(--secondary)]">
                 <div className="text-sm text-[var(--muted-foreground)]">
@@ -611,17 +1032,59 @@ json.dumps(__results__)
             </>
           ) : (
             /* Results tab */
-            <div className="flex-1 overflow-auto p-4">
+            <div className="flex-1 overflow-auto p-4 flex flex-col">
               <TestResults
                 visibleResults={visibleResults}
                 hiddenPassedCount={hiddenPassedCount}
                 hiddenTotalCount={hiddenTotalCount}
                 visibleTestCases={visibleTestCases}
               />
+
+              {/* Complexity Analysis in Results tab */}
+              {complexityResult?.success && (
+                <div className="mt-4 p-3 rounded bg-[var(--secondary)]/50 border border-[var(--border)]">
+                  <div className="flex items-center gap-2 text-sm">
+                    <Gauge className="h-4 w-4 text-[var(--primary)]" />
+                    <span className="font-medium">
+                      Estimated Complexity: {complexityResult.complexity}
+                    </span>
+                  </div>
+                </div>
+              )}
+
+              {/* Success state with navigation */}
+              {(() => {
+                const visiblePassed = visibleResults.filter((r) => r.passed).length;
+                const visibleTotal = visibleResults.length;
+                const allVisiblePassed = visibleTotal > 0 && visiblePassed === visibleTotal;
+                const allHiddenPassed =
+                  hiddenTotalCount === 0 || hiddenPassedCount === hiddenTotalCount;
+                const allPassed = allVisiblePassed && allHiddenPassed && hiddenTotalCount > 0;
+
+                if (!allPassed) return null;
+
+                return (
+                  <div className="mt-6 p-4 rounded-lg bg-green-500/10 border border-green-500/30">
+                    <div className="flex items-center gap-2 text-green-500 font-semibold mb-3">
+                      <CheckCircle className="h-5 w-5" />
+                      All tests passed!
+                    </div>
+                    <div className="flex items-center gap-3">
+                      <Link
+                        href="/questions"
+                        className="px-4 py-2 text-sm font-medium rounded bg-[var(--secondary)] border border-[var(--border)] hover:bg-[var(--accent)] transition-colors"
+                      >
+                        Back to Questions
+                      </Link>
+                    </div>
+                  </div>
+                );
+              })()}
             </div>
           )}
         </div>
         </div>
+      )}
     </div>
   );
 }