Create script.js

script.js

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+console.log("Script execution started.");
+// --- Global Variables ---
+let generatedCode = [];
+let currentCleanedCode = [];
+
+let evolutionTimeline = [];
+let activeTimelineIndex = -1;
+let selectedVariationGridIndex = -1;
+let currentFullscreenHistoryIndex = -1;
+
+let originalUserPromptForCurrentGeneration = '';
+let lastPreviewUpdateTime = [];
+let previewUpdateInterval = 500;
+let numVariationsToGenerate = 4;
+let activeApiControllers = [];
+
+let lastGenerationConfig = {
+    prompt: '',
+    isRefinement: false,
+    numVariations: 4,
+    refinedTimelineIndex: -1
+};
+
+
+// --- DOM Element References ---
+let apiKeyEl, codeOutputEl, errorMessageEl;
+let modelSelEl;
+let selectButtons = [];
+let fullscreenButtons = [];
+let previewItems = [];
+
+let refinementLoadingIndicator;
+let mainContentEl, configButtonEl;
+let intervalSliderEl, intervalValueDisplayEl;
+
+let fullscreenOverlayEl, fullscreenIframeEl, exitFullscreenBtnEl;
+let perspectiveViewportEl, previewGridWrapperEl;
+
+let historyPanelEl, historyPanelPlaceholderEl;
+let selectedCodeTitleH3El;
+let mainContentTitleH1El, mainContentSubtitleH2El;
+let fullscreenHistoryNavEl, historyNavPrevBtnEl, historyNavNextBtnEl;
+let promptModalOverlayEl, promptModalContentEl, modalUserPromptEl, modalGenerateBtnEl, modalCancelBtnEl, modalLoadingIndicatorEl;
+let modalRefinementCheckboxEl, numVariationsSliderEl, numVariationsValueDisplayEl;
+let configModalOverlayEl, configModalContentEl, configModalCloseBtnEl, copyCodeButtonEl;
+let historyToggleButtonEl, historyArrowDownEl, historyArrowUpEl;
+let exportCodeButtonEl;
+let newButtonEl;
+let confirmModalOverlayEl, confirmModalMessageEl, confirmModalConfirmBtnEl, confirmModalCancelBtnEl;
+let currentConfirmCallback = null;
+let historyNavLeftBtnEl, historyNavRightBtnEl;
+let promptDisplayModalOverlayEl, promptDisplayModalContentEl, fullPromptTextEl, promptDisplayModalCloseBtnEl;
+let showPromptModalButtonEl; // Added for the new button
+let modalContextSizeValueEl, modalMaxTokensValueEl, modalMaxTokensSliderEl; // Added for new modal elements
+
+
+// --- Constants ---
+const API_BASE_URL = 'https://api.novita.ai/v3/openai'; // New Novita API
+
+const MODEL_DETAILS = {
+    "deepseek/deepseek-v3-turbo": { context: 64000, maxOutput: 16000, defaultOutput: 8192 },
+    "deepseek/deepseek-r1-turbo": { context: 64000, maxOutput: 16000, defaultOutput: 8192 },
+    "qwen/qwen3-235b-a22b-fp8": { context: 128000, maxOutput: 128000, defaultOutput: 16384 },
+    "qwen/qwen3-30b-a3b-fp8": { context: 128000, maxOutput: 128000, defaultOutput: 16384 },
+    "qwen/qwen3-32b-fp8": { context: 128000, maxOutput: 128000, defaultOutput: 16384 },
+    "google/gemma-3-27b-it": { context: 32000, maxOutput: 32000, defaultOutput: 8192 },
+    "mistralai/mistral-nemo": { context: 131072, maxOutput: 131072, defaultOutput: 16384 },
+    "meta-llama/llama-4-scout-17b-16e-instruct": { context: 131072, maxOutput: 131072, defaultOutput: 16384 },
+    "meta-llama/llama-4-maverick-17b-128e-instruct-fp8": { context: 1048576, maxOutput: 1048576, defaultOutput: 16384 }
+};
+
+
+// --- Helper Function to Process Stream for One Variation ---
+async function processStreamForVariation(apiKey, userPrompt, variationIndex, modelName, signal) {
+    console.log(`[Variation ${variationIndex + 1}] Starting generation with model ${modelName}...`);
+    const previewFrame = document.getElementById(`preview-frame-${variationIndex + 1}`);
+    const loader = document.getElementById(`preview-loader-${variationIndex + 1}`);
+    const selectBtn = selectButtons[variationIndex];
+    const fullscreenBtn = fullscreenButtons[variationIndex];
+
+    if (!previewFrame) { console.error(`[Variation ${variationIndex + 1}] Preview frame missing.`); return false; }
+    if (!loader) { console.warn(`[Variation ${variationIndex + 1}] Loader missing.`); }
+
+
+    if (loader) loader.classList.remove('hidden');
+    if (selectBtn) selectBtn.disabled = true;
+    if (fullscreenBtn) fullscreenBtn.disabled = true;
+
+    if (previewFrame) updateLivePreviewInGrid(variationIndex, '<div class="flex items-center justify-center h-full"><p class="text-slate-500">Generating...</p></div>', false);
+    if(lastPreviewUpdateTime[variationIndex] !== undefined) lastPreviewUpdateTime[variationIndex] = 0;
+
+
+    const API_ENDPOINT = `${API_BASE_URL}/chat/completions`; // New Novita API endpoint
+    let rawGeneratedCode = '';
+    let htmlBlockStarted = false;
+    let success = false;
+    let isInsideThinkBlock = false; // Flag to track if we are inside a <think> block
+
+    // Construct conversation history for Novita API
+    // The prompt passed to this function (userPrompt) is already formatted with instructions and user request.
+    const conversationHistory = [
+        { role: "user", content: userPrompt }
+    ];
+
+    try {
+        console.log(`[Variation ${variationIndex + 1}] Novita API call with model: ${modelName}`);
+        const response = await fetch(API_ENDPOINT, {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json',
+                'Authorization': `Bearer ${apiKey}` // Novita uses Bearer token
+            },
+            body: JSON.stringify({
+                model: modelName, // Model name for Novita
+                messages: conversationHistory,
+                stream: true,
+                reasoning: { exclude: true }, // Added reasoning parameter
+                max_tokens: parseInt(modalMaxTokensSliderEl.value, 10) // Send max_tokens
+            }),
+            signal: signal
+        });
+
+        if (!response.ok) {
+            let errorDetails = `API Error: ${response.status} ${response.statusText}`;
+            try { 
+                const errorDataText = await response.text(); // Try to get text first for more detailed errors
+                console.error(`[Variation ${variationIndex + 1}] Novita API Error Response Text:`, errorDataText);
+                const errorData = JSON.parse(errorDataText); // Then try to parse as JSON
+                errorDetails += ` - ${errorData?.error?.message || errorData?.detail || errorDataText || 'No specific message.'}`;
+            } catch (e) { 
+                errorDetails += ` - Could not parse error response.`;
+            }
+            throw new Error(errorDetails);
+        }
+
+        const reader = response.body.getReader();
+        const decoder = new TextDecoder();
+        let sseBuffer = ""; // Buffer for incomplete SSE messages
+        let streamEnded = false;
+
+        while (!streamEnded) {
+            const { done, value } = await reader.read();
+            if (done) {
+                streamEnded = true;
+                break;
+            }
+
+            sseBuffer += decoder.decode(value, { stream: true });
+            let eolIndex;
+            while ((eolIndex = sseBuffer.indexOf('\n')) >= 0) {
+                const line = sseBuffer.substring(0, eolIndex).trim();
+                sseBuffer = sseBuffer.substring(eolIndex + 1);
+
+                if (line.startsWith('data: ')) {
+                    const data = line.substring(6).trim();
+                    if (data === '[DONE]') {
+                        streamEnded = true;
+                        break;
+                    }
+                    try {
+                        const json = JSON.parse(data);
+                        const deltaContent = json.choices?.[0]?.delta?.content;
+                        
+                        if (deltaContent) {
+                            let currentChunk = deltaContent;
+                            let processedChunkForThisDelta = '';
+
+                            while (currentChunk.length > 0) {
+                                if (isInsideThinkBlock) {
+                                    const endThinkTagIndex = currentChunk.indexOf('</think>');
+                                    if (endThinkTagIndex !== -1) {
+                                        // Found the end tag. Content after it is actual.
+                                        processedChunkForThisDelta += currentChunk.substring(endThinkTagIndex + '</think>'.length);
+                                        isInsideThinkBlock = false;
+                                        currentChunk = ''; // Current delta's relevant part processed
+                                    } else {
+                                        // Still inside think block, discard this part of the chunk
+                                        currentChunk = ''; // Discard and move to next delta if any
+                                    }
+                                } else {
+                                    const startThinkTagIndex = currentChunk.indexOf('<think>');
+                                    if (startThinkTagIndex !== -1) {
+                                        // Found a start tag. Content before it is actual.
+                                        processedChunkForThisDelta += currentChunk.substring(0, startThinkTagIndex);
+                                        isInsideThinkBlock = true;
+                                        // The rest of currentChunk starts after <think>
+                                        currentChunk = currentChunk.substring(startThinkTagIndex + '<think>'.length);
+                                        // This remaining part of currentChunk will be re-evaluated in the next iteration
+                                        // of this inner while loop, now with isInsideThinkBlock = true.
+                                    } else {
+                                        // No think tags, entire chunk is actual content
+                                        processedChunkForThisDelta += currentChunk;
+                                        currentChunk = '';
+                                    }
+                                }
+                            }
+
+                            if (processedChunkForThisDelta.length > 0) {
+                                rawGeneratedCode += processedChunkForThisDelta;
+                                // The htmlBlockStarted logic might need re-evaluation.
+                                // For now, assume content is part of the HTML stream.
+                                if (!htmlBlockStarted) {
+                                    // Try to detect '```html' or start accumulating if it appears
+                                    const marker = "```html";
+                                    let tempAccumulated = rawGeneratedCode; // Use the cleaned rawGeneratedCode
+                                    const markerIndex = tempAccumulated.indexOf(marker);
+                                    if (markerIndex !== -1) {
+                                        htmlBlockStarted = true;
+                                        let codeStartIndex = markerIndex + marker.length;
+                                        if (tempAccumulated[codeStartIndex] === '\n') {
+                                            codeStartIndex++;
+                                        }
+                                        rawGeneratedCode = tempAccumulated.substring(codeStartIndex);
+                                    } else if (tempAccumulated.trim().startsWith("<!DOCTYPE html") || tempAccumulated.trim().startsWith("<html")) {
+                                        // If it looks like HTML already, assume block started
+                                        htmlBlockStarted = true;
+                                    }
+                                } 
+                                // If htmlBlockStarted is true, or we assume it's direct HTML content
+                                if (htmlBlockStarted || !(rawGeneratedCode.includes("```html"))) { 
+                                    const now = Date.now();
+                                    if (lastPreviewUpdateTime[variationIndex] !== undefined && (now - lastPreviewUpdateTime[variationIndex] >= previewUpdateInterval)) {
+                                        // Strip markdown for preview if still present at this stage
+                                        let previewCode = rawGeneratedCode; // Use the cleaned rawGeneratedCode
+                                        if (previewCode.includes("```html")) {
+                                             previewCode = previewCode.substring(previewCode.indexOf("```html") + 7).trimStart();
+                                        }
+                                        if (previewCode.endsWith("```")) {
+                                            previewCode = previewCode.substring(0, previewCode.length - 3).trimEnd();
+                                        }
+                                        updateLivePreviewInGrid(variationIndex, previewCode, true);
+                                        lastPreviewUpdateTime[variationIndex] = now;
+                                    }
+                                }
+                            }
+                        }
+                    } catch (e) { 
+                        console.warn(`[Var ${variationIndex + 1}] JSON parse error in stream:`, e, "Problematic Line:", line, "Data:", data);
+                    }
+                }
+            }
+            if (streamEnded) break; // Exit outer loop if [DONE] was processed
+        }
+
+        console.log(`[Variation ${variationIndex + 1}] Streaming finished. Raw content length: ${rawGeneratedCode.length}`);
+        let finalExtractedHtml = null; 
+        let processingErrorMessage = null; 
+
+        // Process the rawGeneratedCode after stream ends
+        // This needs to handle potential markdown ```html ... ``` blocks
+        let tempHtml = rawGeneratedCode.trim();
+        const htmlMarker = "```html";
+        const markerIndex = tempHtml.indexOf(htmlMarker);
+
+        if (markerIndex !== -1) {
+            htmlBlockStarted = true; // Confirm block started if marker found
+            tempHtml = tempHtml.substring(markerIndex + htmlMarker.length).trimStart();
+        }
+        // Remove trailing ``` if present
+        if (tempHtml.endsWith("```")) {
+            tempHtml = tempHtml.substring(0, tempHtml.length - 3).trimEnd();
+        }
+
+        // If no ```html was found, but it looks like html, use it directly
+        if (!htmlBlockStarted && (tempHtml.startsWith("<!DOCTYPE") || tempHtml.startsWith("<html"))) {
+            htmlBlockStarted = true; // Assume it's HTML
+        }
+
+        if (htmlBlockStarted && tempHtml.length > 0) {
+            finalExtractedHtml = tempHtml;
+            const minLength = 20;
+            const hasStructuralTag = /<!DOCTYPE html|<html[^>]*>|<head[^>]*>|<body[^>]*>/i.test(finalExtractedHtml);
+            const hasAnyTag = /<[a-zA-Z][^>]*>/.test(finalExtractedHtml);
+
+            if (finalExtractedHtml.length >= minLength && (hasStructuralTag || hasAnyTag)) {
+                success = true;
+                console.log(`[Variation ${variationIndex + 1}] HTML validation SUCCEEDED.`);
+            } else {
+                success = false; 
+                console.warn("[Variation " + (variationIndex + 1) + "] HTML validation FAILED (length: " + finalExtractedHtml.length + ", structural: " + hasStructuralTag + ", anyTag: " + hasAnyTag + "). Review content manually.");
+                processingErrorMessage = "// Warning: Generated content did not pass basic HTML validation.";
+                if (!finalExtractedHtml) finalExtractedHtml = processingErrorMessage; // Ensure some content for display
+            }
+        } else if (tempHtml.length > 0 && !htmlBlockStarted) { // Content received but not identified as HTML block
+             processingErrorMessage = `// Warning: Content received, but 'Written by Novita AI' or similar marker not found, or content doesn't look like HTML. Length: ${tempHtml.length}`;
+             console.warn(`[Variation ${variationIndex + 1}] ${processingErrorMessage}`);
+             finalExtractedHtml = tempHtml; // Display what was received
+             success = false; // Treat as not fully successful if not identified as clean HTML
+        } else {
+            processingErrorMessage = `// Error: No meaningful content generated or 'Written by Novita AI' marker not found.`;
+            console.warn(`[Variation ${variationIndex + 1}] ${processingErrorMessage}`);
+            finalExtractedHtml = processingErrorMessage; // Show error message
+            success = false;
+        }
+
+        if (success && finalExtractedHtml) {
+            let processedHtml = finalExtractedHtml;
+            const requiredHeadContent = `
+                        <meta charset="UTF-8">
+                        <meta name="viewport" content="width=device-width, initial-scale=1.0">
+                        <script src="https://cdn.tailwindcss.com"><\\/script>
+                        <link rel="preconnect" href="https://rsms.me/">
+                        <link rel="stylesheet" href="https://rsms.me/inter/inter.css">
+                        <style>
+                        html { font-family: 'Inter', sans-serif; }
+                        @supports (font-variation-settings: normal) {
+                            html { font-family: 'Inter var', sans-serif; }
+                        }
+                        body {
+                            background-color: #f8fafc; /* slate-50 */
+                            color: #0f172a; /* slate-900 */
+                            padding: 1rem;
+                        }
+                        </style>`; 
+
+            if (!processedHtml.includes('<head>')) {
+                processedHtml = `<head>${requiredHeadContent}</head><body>${processedHtml}</body>`;
+            } else { 
+                let tempRequired = "";
+                if (!processedHtml.includes('cdn.tailwindcss.com')) tempRequired += `    <script src="https://cdn.tailwindcss.com"><\\/script>\\n`;
+                if (!processedHtml.includes('inter.css')) tempRequired += `    <link rel="preconnect" href="https://rsms.me/">\\n    <link rel="stylesheet" href="https://rsms.me/inter/inter.css">\\n`;
+                if (!processedHtml.includes("html { font-family: 'Inter', sans-serif; }")) { 
+                    tempRequired += `    <style>\\n      html { font-family: 'Inter', sans-serif; }\\n      @supports (font-variation-settings: normal) { html { font-family: 'Inter var', sans-serif; } }\\n      body { background-color: #f8fafc; color: #0f172a; padding: 1rem; }\\n    </style>\\n`;
+                }
+                if (tempRequired) { 
+                    processedHtml = processedHtml.replace(/<\/head>/i, `${tempRequired}</head>`);
+                }
+            }
+            if(currentCleanedCode[variationIndex] !== undefined) currentCleanedCode[variationIndex] = processedHtml;
+
+            const interactionScript = `<script>(function() { const VARIATION_INDEX = ${variationIndex}; })(); <\\/script>`;
+            const bodyEndIndex = processedHtml.lastIndexOf('</body>');
+            if(generatedCode[variationIndex] !== undefined) {
+                generatedCode[variationIndex] = (bodyEndIndex !== -1)
+                    ? processedHtml.slice(0, bodyEndIndex) + interactionScript + processedHtml.slice(bodyEndIndex)
+                    : processedHtml + interactionScript;
+            }
+            updateLivePreviewInGrid(variationIndex, null, true);
+        } else {
+            generatedCode[variationIndex] = ''; 
+            if (finalExtractedHtml) { 
+                if(currentCleanedCode[variationIndex] !== undefined) currentCleanedCode[variationIndex] = finalExtractedHtml; // Store the potentially partial/error code
+                updateLivePreviewInGrid(variationIndex, finalExtractedHtml, false); 
+            } else { 
+                const displayError = processingErrorMessage || "// Unknown error during generation.";
+                if(currentCleanedCode[variationIndex] !== undefined) currentCleanedCode[variationIndex] = displayError; 
+                updateLivePreviewInGrid(variationIndex, `<div class="p-4 text-red-400 font-medium">${displayError.replace(/\\n/g, '<br>')}</div>`, false); 
+            }
+        }
+
+    } catch (error) {
+        if (error.name === 'AbortError') {
+            console.log(`[Variation ${variationIndex + 1}] Fetch aborted.`);
+            updateLivePreviewInGrid(variationIndex, `<div class="p-4 text-yellow-400 font-medium">Generation Cancelled.</div>`, false);
+        } else {
+            console.error(`[Variation ${variationIndex + 1}] Generation error:`, error);
+            updateLivePreviewInGrid(variationIndex, `<div class="p-4 text-red-400 font-medium">Error: ${error.message}</div>`, false);
+        }
+        if(currentCleanedCode[variationIndex] !== undefined) currentCleanedCode[variationIndex] = `// Error: ${error.message}`;
+        if(generatedCode[variationIndex] !== undefined) generatedCode[variationIndex] = '';
+        success = false; // Explicitly set success to false on error
+    } finally {
+        const finalLoader = document.getElementById(`preview-loader-${variationIndex + 1}`);
+        if (finalLoader) finalLoader.classList.add('hidden');
+        if (selectBtn) selectBtn.disabled = !success; 
+        if (fullscreenBtn) fullscreenBtn.disabled = !success; 
+    }
+    return success;
+}
+
+// --- Main Function to Generate Variations ---
+async function generateVariations() {
+    console.log("generateVariations called.");
+    const userPromptText = modalUserPromptEl.value.trim(); // Renamed from userPrompt to avoid conflict
+
+    if (!apiKeyEl || !modalUserPromptEl || !modelSelEl || !previewGridWrapperEl || !modalGenerateBtnEl || !modalLoadingIndicatorEl || !errorMessageEl || !codeOutputEl) {
+        console.error("Cannot generate variations: One or more critical elements are missing.");
+        if (errorMessageEl) errorMessageEl.textContent = "Initialization error. Cannot generate.";
+        return;
+    }
+
+    const apiKey = apiKeyEl.value.trim();
+    const selectedModel = modelSelEl.value;
+    const currentIsRefinementMode = modalRefinementCheckboxEl.checked;
+    const currentNumVariations = parseInt(numVariationsSliderEl.value, 10);
+
+    if (!apiKey || !userPromptText) {
+        errorMessageEl.textContent = 'Error: API Key and Prompt (via Alt+P) are required.';
+        if (!userPromptText && !promptModalOverlayEl.classList.contains('visible')) showPromptModal();
+        return;
+    }
+     if (!selectedModel) {
+         errorMessageEl.textContent = 'Error: Please select a model.';
+         return;
+     }
+
+    lastGenerationConfig = {
+        prompt: userPromptText,
+        isRefinement: currentIsRefinementMode,
+        numVariations: currentNumVariations,
+        refinedTimelineIndex: currentIsRefinementMode ? activeTimelineIndex : -1
+    };
+
+
+    errorMessageEl.textContent = '';
+    console.log(`Mode: ${currentIsRefinementMode ? 'Refinement' : 'Initial'}, Model: ${selectedModel}, Variations: ${currentNumVariations}`);
+
+    let baseCodeForRefinement = null;
+    let contextPromptForRefinement = '';
+    originalUserPromptForCurrentGeneration = userPromptText; // Use the new variable name
+
+    if (currentIsRefinementMode && activeTimelineIndex !== -1 && evolutionTimeline[activeTimelineIndex]) {
+        baseCodeForRefinement = evolutionTimeline[activeTimelineIndex].code;
+        contextPromptForRefinement = evolutionTimeline[activeTimelineIndex].originalUserPrompt;
+        console.log(`Refining Evolution ${activeTimelineIndex + 1}. Original context: "${contextPromptForRefinement}"`);
+    } else if (currentIsRefinementMode) {
+         errorMessageEl.textContent = 'Error: No active evolution selected to refine. Uncheck "refine" or select an evolution from history.';
+         return;
+    }
+
+    modalGenerateBtnEl.disabled = true;
+    modalLoadingIndicatorEl.classList.remove('hidden');
+    if (codeOutputEl && selectedCodeTitleH3El) {
+        codeOutputEl.innerHTML = '<code class="language-html">// Select a variation to view its code.</code>';
+        selectedCodeTitleH3El.textContent = "Selected Code:";
+    }
+    selectedVariationGridIndex = -1;
+
+    numVariationsToGenerate = currentNumVariations;
+    generatedCode = Array(numVariationsToGenerate).fill('');
+    currentCleanedCode = Array(numVariationsToGenerate).fill('');
+    lastPreviewUpdateTime = Array(numVariationsToGenerate).fill(0);
+    selectButtons = Array(numVariationsToGenerate).fill(null);
+    fullscreenButtons = Array(numVariationsToGenerate).fill(null);
+    previewItems = Array(numVariationsToGenerate).fill(null);
+
+
+    showFourGridPreviewUI();
+
+    activeApiControllers = Array(numVariationsToGenerate).fill(null).map(() => new AbortController());
+
+    // Construct the prompts for Novita - they will be passed as the 'user' message content
+    const promptsForNovita = Array(numVariationsToGenerate).fill(null).map((_, i) => {
+        if (currentIsRefinementMode && baseCodeForRefinement) {
+            // For Novita, the prompt should be structured clearly for the model to understand the task.
+            // The API call itself will use a messages array. This is the content for the 'user' role.
+            return `
+CONTEXT: You are an expert web developer specializing in HTML, Tailwind CSS, and JavaScript.
+Original User Request (for context of the base code): "${contextPromptForRefinement}"
+Base HTML Code to Refine:
+\`\`\`html
+${baseCodeForRefinement}
+\`\`\`
+Your Task: Implement the following refinement instructions for Variation ${i + 1} of ${numVariationsToGenerate}.
+User's Refinement Instructions: "${userPromptText}"
+
+Instructions for your output:
+1. Analyze the Base Code and the User's Refinement Instructions.
+2. Modify ONLY the necessary parts of the Base Code to implement the refinement.
+3. Try a slightly different approach if possible, as this is one of several variations.
+4. Ensure the refined code remains a single, complete, runnable HTML document.
+5. ALWAYS include Tailwind CSS CDN (<script src="https://cdn.tailwindcss.com"><\\/script>) and Inter font (<link rel="stylesheet" href="https://rsms.me/inter/inter.css">) in the <head>.
+6. Add basic body styling for readability: <style>html { font-family: 'Inter', sans-serif; } body { background-color: #f8fafc; color: #0f172a; padding: 1rem; }</style>
+7. Output ONLY the raw, complete, refined HTML code. Start your response with \`\`\`html and end with \`\`\`
+Refined Code:`;
+        } else {
+            return `
+CONTEXT: You are an expert web developer specializing in clean, modern HTML, CSS (using Tailwind CSS classes), and JavaScript.
+Your Task: Generate the complete, runnable HTML code for Variation ${i + 1} of ${numVariationsToGenerate} based on the User Request below.
+
+Instructions for your output:
+1. Ensure the code is self-contained.
+2. ALWAYS include Tailwind CSS CDN (<script src="https://cdn.tailwindcss.com"><\\/script>) in the <head>.
+3. ALWAYS include Inter font (<link rel="stylesheet" href="https://rsms.me/inter/inter.css">) and set html { font-family: 'Inter', sans-serif; } in a <style> tag in the <head>.
+4. Add basic body styling for readability: body { background-color: #f8fafc; color: #0f172a; padding: 1rem; } in the same <style> tag.
+5. Add HTML comments to explain the code if helpful.
+6. Try to make this variation distinct.
+7. Output ONLY the raw HTML code. Start your response with \`\`\`html and end with \`\`\`
+
+User Request:
+"${originalUserPromptForCurrentGeneration}"
+Code:`;
+        }
+    });
+
+    const generationPromises = promptsForNovita.map((promptContent, index) =>
+        processStreamForVariation(apiKey, promptContent, index, selectedModel, activeApiControllers[index].signal)
+    );
+
+    try {
+        const results = await Promise.allSettled(generationPromises);
+        console.log("Generation promises settled:", results);
+        const successfulGenerations = results.filter(r => r.status === 'fulfilled' && r.value === true).length;
+        if (successfulGenerations === 0 && !results.some(r => r.status === 'rejected' && r.reason.name === 'AbortError')) {
+            errorMessageElement.textContent = 'Error: All variations failed.';
+        }
+        else if (successfulGenerations < numVariationsToGenerate && !results.every(r => r.status === 'rejected' && r.reason.name === 'AbortError')) {
+            errorMessageElement.textContent = `Warning: ${numVariationsToGenerate - successfulGenerations} var(s) failed or were cancelled.`;
+        }
+
+        updateMainContentTitles("Select a Variation", "Click 'Select' on a preview below.");
+
+    } catch (error) {
+        console.error("Parallel generation error:", error);
+        errorMessageElement.textContent = `Unexpected Error: ${error.message}`;
+        showInitialPreviewStateUI();
+    } finally {
+        modalGenerateBtnEl.disabled = false;
+        modalLoadingIndicatorEl.classList.add('hidden');
+        console.log("Generation process finished.");
+    }
+}
+
+// --- UI Update Functions ---
+function createPreviewItemDOM(index, isGridItem = true) {
+    const item = document.createElement('div');
+    item.id = `preview-item-${index + 1}`;
+    item.className = isGridItem ? 'preview-item-perspective' : 'single-preview-item';
+    if (isGridItem) item.dataset.variationGridIndex = index;
+
+    const header = document.createElement('div'); header.className = 'preview-header';
+    const title = document.createElement('span'); title.className = 'preview-header-title';
+    title.textContent = isGridItem ? `Variation ${index + 1}` : (evolutionTimeline[activeTimelineIndex]?.prompt.substring(0,30) + '...' || `Evolution ${activeTimelineIndex + 1}`);
+    header.appendChild(title);
+
+    const btns = document.createElement('div'); btns.className = 'preview-header-buttons';
+
+    const fsBtn = document.createElement('button');
+    fsBtn.className = 'fullscreen-btn p-1 focus:outline-none focus:ring-1 focus:ring-cyan-500 rounded disabled:opacity-50';
+    fsBtn.dataset.idx = index;
+    fsBtn.title = 'Full Screen'; fsBtn.disabled = true;
+    fsBtn.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M8 3H5a2 2 0 0 0-2 2v3m18 0V5a2 2 0 0 0-2-2h-3m0 18h3a2 2 0 0 0 2-2v-3M3 16v3a2 2 0 0 0 2 2h3"/></svg>`;
+    fsBtn.addEventListener('click', (e) => {
+        const idxToFullscreen = isGridItem ? parseInt(e.currentTarget.dataset.idx) : activeTimelineIndex;
+        const fromHistory = !isGridItem;
+        if (!isNaN(idxToFullscreen) && (isGridItem ? generatedCode[idxToFullscreen] : evolutionTimeline[idxToFullscreen]?.code)) {
+            enterFullscreen(idxToFullscreen, fromHistory);
+        }
+    });
+
+    btns.appendChild(fsBtn);
+
+    if (isGridItem) {
+        const selBtn = document.createElement('button');
+        selBtn.className = 'select-variation-btn futuristic-button px-3 py-1 text-xs';
+        selBtn.dataset.variationGridIndex = index; selBtn.disabled = true; selBtn.textContent = 'Select';
+        selBtn.addEventListener('click', handleSelectVariationFromGrid);
+        selectButtons[index] = selBtn;
+        btns.appendChild(selBtn);
+    }
+
+    header.appendChild(btns);
+    item.appendChild(header);
+
+    const bodyEl = document.createElement('div'); bodyEl.className = 'preview-body';
+    const loaderDiv = document.createElement('div'); loaderDiv.id = `preview-loader-${index + 1}`;
+    loaderDiv.className = 'preview-loader ' + (isGridItem ? 'hidden' : '');
+    loaderDiv.innerHTML = '<div class="spinner"></div>';
+    bodyEl.appendChild(loaderDiv);
+
+    const iframeEl = document.createElement('iframe');
+    iframeEl.id = isGridItem ? `preview-frame-${index + 1}` : 'single-large-preview-frame';
+    iframeEl.title = `Preview ${index + 1}`; iframeEl.className = 'preview-frame';
+    iframeEl.srcdoc = '<div class="flex items-center justify-center h-full"><p class="text-slate-400">Preparing...</p></div>';
+    bodyEl.appendChild(iframeEl);
+    item.appendChild(bodyEl);
+
+    if (isGridItem) {
+        previewItems[index] = item;
+        fullscreenButtons[index] = fsBtn;
+    }
+    return item;
+}
+
+
+function showFourGridPreviewUI() {
+    previewGridWrapperEl.innerHTML = '';
+    if (numVariationsToGenerate === 1) {
+        previewGridWrapperEl.className = 'single-mode';
+        if(perspectiveViewportEl) perspectiveViewportEl.style.perspective = 'none';
+         const item = createPreviewItemDOM(0, true);
+         previewGridWrapperEl.appendChild(item);
+
+    } else if (numVariationsToGenerate === 2) {
+        previewGridWrapperEl.className = 'grid grid-cols-2 grid-rows-1 gap-6';
+        if(perspectiveViewportEl) perspectiveViewportEl.style.perspective = '1500px';
+         for (let i = 0; i < numVariationsToGenerate; i++) {
+            const item = createPreviewItemDOM(i, true);
+            previewGridWrapperEl.appendChild(item);
+        }
+    } else {
+         previewGridWrapperEl.className = 'grid-mode';
+         if(perspectiveViewportEl) perspectiveViewportEl.style.perspective = '1500px';
+         for (let i = 0; i < numVariationsToGenerate; i++) {
+            const item = createPreviewItemDOM(i, true);
+            previewGridWrapperEl.appendChild(item);
+        }
+    }
+    updateSelectedGridItemUI();
+}
+
+function showSingleLargePreviewUI(htmlContent, titleText, fullPromptText) {
+    previewGridWrapperEl.innerHTML = '';
+    previewGridWrapperEl.className = 'single-mode';
+     if(perspectiveViewportEl) perspectiveViewportEl.style.perspective = 'none';
+
+    const item = document.createElement('div');
+    item.className = 'single-preview-item';
+
+    const bodyEl = document.createElement('div');
+    bodyEl.className = 'preview-body';
+
+    const iframeEl = document.createElement('iframe');
+    iframeEl.id = `single-large-preview-frame`;
+    iframeEl.title = titleText;
+    iframeEl.className = 'preview-frame';
+    iframeEl.srcdoc = htmlContent;
+
+    bodyEl.appendChild(iframeEl);
+    item.appendChild(bodyEl);
+    previewGridWrapperEl.appendChild(item);
+
+    // Handle subtitle truncation and clickability
+    const maxPromptLength = 50;
+    let displaySubtitle = fullPromptText;
+    mainContentSubtitleH2El.classList.remove('prompt-truncated');
+    delete mainContentSubtitleH2El.dataset.fullPrompt;
+
+    if (fullPromptText && fullPromptText.length > maxPromptLength) {
+        displaySubtitle = fullPromptText.substring(0, maxPromptLength) + "... (click to view full)";
+        mainContentSubtitleH2El.classList.add('prompt-truncated');
+        mainContentSubtitleH2El.dataset.fullPrompt = fullPromptText; // Store full prompt
+    }
+
+    updateMainContentTitles(titleText, displaySubtitle); // Use potentially truncated text
+}
+
+function showInitialPreviewStateUI() {
+    previewGridWrapperEl.innerHTML = '<div class="col-span-2 row-span-2 flex items-center justify-center text-slate-500 text-lg"><p>Press Alt+O, then Alt+P to begin.</p></div>';
+    previewGridWrapperEl.className = 'grid-mode';
+    if(perspectiveViewportEl) perspectiveViewportEl.style.perspective = '1500px';
+    updateMainContentTitles("Live Previews", "Powered by Open Models from Novita.AI Model API");
+    if (codeOutputEl) codeOutputEl.innerHTML = '<code class="language-html">// Select a variation or history item to view its code.</code>';
+    if (selectedCodeTitleH3El) selectedCodeTitleH3El.textContent = "Selected Code:";
+    selectedVariationGridIndex = -1;
+    // Reset subtitle state when going back to initial view
+    if (mainContentSubtitleH2El) {
+        mainContentSubtitleH2El.classList.remove('prompt-truncated');
+        delete mainContentSubtitleH2El.dataset.fullPrompt;
+    }
+}
+
+function updateMainContentTitles(title, subtitle) {
+    if (mainContentTitleH1El) mainContentTitleH1El.textContent = title;
+    if (mainContentSubtitleH2El) mainContentSubtitleH2El.textContent = subtitle;
+}
+
+function updateSelectedGridItemUI() {
+    previewItems.forEach((item, index) => {
+        if (!item) return;
+        item.classList.toggle('selected', index === selectedVariationGridIndex);
+    });
+    selectButtons.forEach((button, index) => {
+        if (!button) return;
+        // Button enabled/disabled state is handled by procStream's success.
+        // const hasCode = currentCleanedCode[index]?.length > 0 && !currentCleanedCode[index].startsWith("// Error");
+        // button.disabled = !hasCode;
+        // if (fullscreenButtons[index]) { fullscreenButtons[index].disabled = !hasCode; }
+
+        button.classList.remove('selected-state');
+        if (index === selectedVariationGridIndex) {
+            button.textContent = 'Selected';
+            button.classList.add('selected-state');
+        } else {
+            button.textContent = 'Select';
+        }
+    });
+}
+
+function updateLivePreviewInGrid(index, codeToRender = null, applyZoom = false) {
+    let baseHtml = codeToRender !== null ? codeToRender : generatedCode[index];
+    const frame = document.getElementById(`preview-frame-${index + 1}`);
+    if (!frame) { console.warn(`[updateLivePreviewInGrid][Var ${index + 1}] Frame not found.`); return; }
+
+    if (typeof baseHtml !== 'string') {
+        baseHtml = '<div class="p-4 text-orange-500">Invalid content received</div>';
+        applyZoom = false;
+    }
+    let finalHtml = baseHtml;
+    try {
+        if (applyZoom && numVariationsToGenerate > 1) {
+            const scaleStyle = `<style>html { transform: scale(0.5); transform-origin: 0 0; width: 200%; height: 200%; overflow: auto !important; } body { overflow: visible !important; min-height: 100% !important; height: auto !important; width: auto !important; }</style>`;
+            const headEndIndex = finalHtml.toLowerCase().lastIndexOf('</head>');
+            if (headEndIndex !== -1) {
+                finalHtml = finalHtml.slice(0, headEndIndex) + scaleStyle + finalHtml.slice(headEndIndex);
+            } else {
+                finalHtml = scaleStyle + finalHtml;
+            }
+        }
+        frame.srcdoc = finalHtml;
+    } catch (e) {
+        console.error(`[Var ${index + 1}] Error setting srcdoc for grid:`, e);
+        try {
+            frame.srcdoc = `<div class="p-4 text-red-500 font-semibold">Preview Render Error</div>`;
+        } catch (finalError) { console.error("Failed to display error in grid iframe:", finalError); }
+    }
+}
+
+// --- Event Handlers ---
+function handleSelectVariationFromGrid(event) {
+    const idx = parseInt(event.target.dataset.variationGridIndex, 10);
+     // Check if code for this variation is valid (not an error message)
+    if (isNaN(idx) || !currentCleanedCode[idx] || currentCleanedCode[idx].startsWith("// Error")) {
+        console.warn(`Cannot select variation ${idx + 1}, code is invalid or generation failed.`);
+        return;
+    }
+
+    activeApiControllers.forEach((controller, controllerIndex) => {
+        if (controllerIndex !== idx && controller) {
+            console.log(`Aborting request for variation ${controllerIndex + 1}`);
+            controller.abort();
+        }
+    });
+    activeApiControllers = [];
+
+
+    selectedVariationGridIndex = idx;
+    const displayCode = generatedCode[idx];
+    const storeCode = currentCleanedCode[idx];
+
+    let originalPromptForThisEvolution;
+    let parentTimelineIdx = null;
+
+    const wasThisGenerationARefinement = lastGenerationConfig.isRefinement;
+    const refinedIndexForThisGen = lastGenerationConfig.refinedTimelineIndex;
+
+    if (wasThisGenerationARefinement && refinedIndexForThisGen !== -1 && evolutionTimeline[refinedIndexForThisGen]) {
+        originalPromptForThisEvolution = evolutionTimeline[refinedIndexForThisGen].originalUserPrompt;
+        parentTimelineIdx = refinedIndexForThisGen;
+    } else {
+        originalPromptForThisEvolution = originalUserPromptForCurrentGeneration;
+    }
+
+    const newHistoryEntry = {
+        id: 'evo-' + Date.now() + '-' + Math.random().toString(36).substr(2, 5),
+        prompt: originalUserPromptForCurrentGeneration,
+        originalUserPrompt: originalPromptForThisEvolution,
+        code: storeCode,
+        timestamp: new Date().toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit'}),
+        parentIndex: parentTimelineIdx
+    };
+    evolutionTimeline.push(newHistoryEntry);
+    activeTimelineIndex = evolutionTimeline.length - 1;
+
+    console.log(`Variation ${idx + 1} selected from grid. Added to timeline as Evolution ${activeTimelineIndex + 1}.`);
+
+    renderHistoryPanel();
+    showSingleLargePreviewUI(displayCode, `Evolution ${activeTimelineIndex + 1}: Active`, `Prompt: "${newHistoryEntry.prompt}"`);
+
+    if (codeOutputEl) {
+        codeOutputEl.textContent = storeCode;
+        if (selectedCodeTitleH3El) selectedCodeTitleH3El.textContent = `Code (Evolution ${activeTimelineIndex + 1}):`;
+        codeOutputEl.classList.remove('text-slate-200');
+        codeOutputEl.classList.add('text-slate-400');
+        if (codeOutputEl?.parentElement) { codeOutputEl.parentElement.scrollTop = 0; }
+    }
+
+
+    updateSelectedGridItemUI();
+    updateHistoryNavigationButtons(); // Update nav buttons
+
+    if(modalUserPromptEl) modalUserPromptEl.value = '';
+    if(modalUserPromptEl) modalUserPromptEl.placeholder = `Refine Evolution ${activeTimelineIndex + 1}...`;
+    if(modalRefinementCheckboxEl) modalRefinementCheckboxEl.checked = true;
+}
+
+function handleHistoryItemClick(timelineIdxToView) {
+    if (timelineIdxToView < 0 || timelineIdxToView >= evolutionTimeline.length) {
+        console.warn("Invalid history index clicked:", timelineIdxToView);
+        return;
+    }
+    activeTimelineIndex = timelineIdxToView;
+    const historyEntry = evolutionTimeline[activeTimelineIndex];
+
+    console.log(`History item ${activeTimelineIndex + 1} selected.`);
+
+    const displayCodeForHistory = historyEntry.code;
+
+    showSingleLargePreviewUI(displayCodeForHistory, `Evolution ${activeTimelineIndex + 1}: Active (Historical)`, `Prompt: "${historyEntry.prompt}"`);
+
+    if (codeOutputEl) {
+        codeOutputEl.textContent = historyEntry.code;
+        if (selectedCodeTitleH3El) selectedCodeTitleH3El.textContent = `Code (Evolution ${activeTimelineIndex + 1} - Historical):`;
+        codeOutputEl.classList.remove('text-slate-200');
+        codeOutputEl.classList.add('text-slate-400');
+        if (codeOutputEl?.parentElement) { codeOutputEl.parentElement.scrollTop = 0; }
+    }
+
+    renderHistoryPanel();
+    updateHistoryNavigationButtons(); // Update nav buttons
+
+    if(modalUserPromptEl) modalUserPromptEl.value = '';
+    if(modalUserPromptEl) modalUserPromptEl.placeholder = `Refine Evolution ${activeTimelineIndex + 1}...`;
+    if(modalRefinementCheckboxEl) modalRefinementCheckboxEl.checked = true;
+    selectedVariationGridIndex = -1;
+    updateSelectedGridItemUI();
+}
+
+
+// --- Render History Panel ---
+function createHistoryThumbnailDOM(entry, index) {
+    const thumbItem = document.createElement('div');
+    thumbItem.className = 'history-thumbnail-item group';
+    thumbItem.dataset.timelineIndex = index;
+    thumbItem.setAttribute('aria-label', `Evolution Step ${index + 1}: ${entry.prompt.substring(0, 30)}...`);
+
+    // Note: Active class and dynamic transforms/z-index are applied in renderHistoryPanel
+
+    const previewContainer = document.createElement('div');
+    previewContainer.className = 'history-thumbnail-preview-container';
+    previewContainer.title = `Click to view Evolution ${index + 1}`;
+    previewContainer.addEventListener('click', () => handleHistoryItemClick(index));
+
+    const iframe = document.createElement('iframe');
+    iframe.className = 'history-thumbnail-preview';
+    iframe.title = `Preview of Evolution ${index + 1}`;
+    const scaledContent = `
+                <style>
+                    html { transform: scale(0.25); transform-origin: 0 0; width: 400%; height: 400%; overflow: hidden !important; background-color: #fff; }
+                    body { width: 100%; height: 100%; overflow: hidden !important; padding: 0 !important; margin: 0 !important; }
+                </style>
+                ${entry.code}
+            `;
+    iframe.srcdoc = scaledContent;
+    previewContainer.appendChild(iframe);
+
+    const titleEl = document.createElement('div');
+    titleEl.className = 'history-thumbnail-title';
+    titleEl.textContent = `Evo ${index + 1}: ${entry.prompt.substring(0, 20)}${entry.prompt.length > 20 ? '...' : ''}`;
+    titleEl.title = `Prompt: ${entry.prompt}\\nClick to view Evolution ${index + 1}`;
+    titleEl.addEventListener('click', () => handleHistoryItemClick(index));
+
+    const fsBtn = document.createElement('button');
+    fsBtn.className = 'history-thumbnail-fullscreen-btn';
+    fsBtn.title = 'View Fullscreen';
+    fsBtn.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M8 3H5a2 2 0 0 0-2 2v3m18 0V5a2 2 0 0 0-2-2h-3m0 18h3a2 2 0 0 0 2-2v-3M3 16v3a2 2 0 0 0 2 2h3"/></svg>`;
+    fsBtn.addEventListener('click', (e) => {
+        e.stopPropagation();
+        enterFullscreen(index, true);
+    });
+
+    thumbItem.appendChild(previewContainer);
+    thumbItem.appendChild(titleEl);
+    thumbItem.appendChild(fsBtn);
+    return thumbItem;
+}
+
+function renderHistoryPanel() {
+    if (!historyPanelEl || !historyPanelPlaceholderEl) return;
+    historyPanelEl.innerHTML = ''; // Clear previous items
+
+    if (evolutionTimeline.length === 0) {
+        historyPanelEl.appendChild(historyPanelPlaceholderEl);
+        historyPanelPlaceholderEl.classList.remove('hidden');
+        return;
+    }
+
+    historyPanelPlaceholderEl.classList.add('hidden');
+
+    const totalItems = evolutionTimeline.length;
+    const middleIndex = Math.floor(totalItems / 2);
+    // const maxRotation = 15; // Max rotation in degrees for edge items (rotation is now 0)
+    const yOffsetFactor = 4; // How much non-active items lift towards the edges
+    const zOffsetFactor = -15; // How much non-active items move back towards the edges
+    const baseZIndex = 10; // Base z-index for non-active items
+
+    // Define specific offsets for the active item to make it stand out
+    const activeYOffset = -15; // Moves active item further up
+    const activeZOffset = 25;  // Moves active item further forward
+
+    evolutionTimeline.forEach((entry, index) => {
+        const thumbItem = createHistoryThumbnailDOM(entry, index);
+        let finalTransform;
+        let finalZIndex;
+
+        if (index === activeTimelineIndex) {
+            thumbItem.classList.add('active-history-item');
+            // Transform for the active item: more prominent
+            finalTransform = `translateY(${activeYOffset}px) translateZ(${activeZOffset}px) rotate(0deg)`;
+            // The .active-history-item class in CSS sets z-index: 50.
+            // We can set it here too for consistency or rely on CSS.
+            finalZIndex = 50; 
+        } else {
+            // Calculate transformations relative to the middle for non-active items
+            const deltaFromMiddle = index - middleIndex;
+            const rotation = 0; // Rotation is kept at 0
+            const translateY = Math.abs(deltaFromMiddle) * yOffsetFactor;
+            const translateZ = Math.abs(deltaFromMiddle) * zOffsetFactor;
+
+            finalTransform = `translateY(${translateY}px) translateZ(${translateZ}px) rotate(${rotation}deg)`;
+            finalZIndex = baseZIndex - Math.abs(deltaFromMiddle);
+        }
+
+        thumbItem.style.zIndex = `${finalZIndex}`;
+        thumbItem.style.transform = finalTransform;
+
+        historyPanelEl.appendChild(thumbItem);
+    });
+    const activeThumb = historyPanelEl.querySelector('.active-history-item');
+    if (activeThumb) {
+        // Keep scrollIntoView, maybe adjust behavior if needed
+        activeThumb.scrollIntoView({ behavior: 'smooth', block: 'nearest', inline: 'center' });
+    }
+}
+
+// --- Full Screen Logic ---
+function enterFullscreen(index, isFromHistory = false) {
+    if (!fullscreenIframeEl || !fullscreenOverlayEl || !document.body || !fullscreenHistoryNavEl || !historyNavPrevBtnEl || !historyNavNextBtnEl) {
+        console.error("Cannot enter fullscreen: Overlay or nav elements missing.");
+        return;
+    }
+
+    let codeToDisplay;
+    currentFullscreenHistoryIndex = -1;
+    fullscreenHistoryNavEl.classList.remove('visible');
+
+    if (isFromHistory) {
+        if (index < 0 || index >= evolutionTimeline.length || !evolutionTimeline[index]) {
+             console.warn("Cannot enter fullscreen for history item", index); return;
+        }
+        codeToDisplay = evolutionTimeline[index].code;
+        currentFullscreenHistoryIndex = index;
+
+        fullscreenHistoryNavEl.classList.add('visible');
+        historyNavPrevBtnEl.disabled = (currentFullscreenHistoryIndex <= 0);
+        historyNavNextBtnEl.disabled = (currentFullscreenHistoryIndex >= evolutionTimeline.length - 1);
+
+    } else {
+         if (index < 0 || index >= numVariationsToGenerate || !generatedCode[index]) {
+            console.warn("Cannot enter fullscreen for variation grid item", index); return;
+         }
+         codeToDisplay = generatedCode[index];
+    }
+
+    fullscreenIframeEl.srcdoc = codeToDisplay;
+    fullscreenOverlayEl.classList.add('visible');
+    document.body.classList.add('fullscreen-active');
+    document.documentElement.style.overflow = 'hidden';
+}
+function exitFullscreen() {
+    if (!fullscreenOverlayEl || !document.body || !fullscreenIframeEl || !fullscreenHistoryNavEl) {
+        console.error("Cannot exit fullscreen: Overlay or nav elements missing.");
+        return;
+    }
+    fullscreenOverlayEl.classList.remove('visible');
+    document.body.classList.remove('fullscreen-active');
+    document.documentElement.style.overflow = '';
+    currentFullscreenHistoryIndex = -1;
+    fullscreenHistoryNavEl.classList.remove('visible');
+    setTimeout(() => { if (fullscreenIframeEl) fullscreenIframeEl.srcdoc = 'about:blank'; }, 300);
+}
+
+function showPreviousHistoryInFullscreen() {
+    if (currentFullscreenHistoryIndex > 0) {
+        currentFullscreenHistoryIndex--;
+        activeTimelineIndex = currentFullscreenHistoryIndex;
+        enterFullscreen(activeTimelineIndex, true);
+        renderHistoryPanel();
+        const historyEntry = evolutionTimeline[activeTimelineIndex];
+        if (historyEntry && codeOutputEl) {
+            codeOutputEl.textContent = historyEntry.code;
+            if(selectedCodeTitleH3El) selectedCodeTitleH3El.textContent = `Code (Evolution ${activeTimelineIndex + 1} - Historical):`;
+        }
+    }
+}
+
+function showNextHistoryInFullscreen() {
+    if (currentFullscreenHistoryIndex < evolutionTimeline.length - 1) {
+        currentFullscreenHistoryIndex++;
+        activeTimelineIndex = currentFullscreenHistoryIndex;
+        enterFullscreen(activeTimelineIndex, true);
+        renderHistoryPanel();
+        const historyEntry = evolutionTimeline[activeTimelineIndex];
+         if (historyEntry && codeOutputEl) {
+            codeOutputEl.textContent = historyEntry.code;
+            if(selectedCodeTitleH3El) selectedCodeTitleH3El.textContent = `Code (Evolution ${activeTimelineIndex + 1} - Historical):`;
+        }
+    }
+}
+
+// --- Prompt Modal Logic ---
+function showPromptModal() {
+    if (!promptModalOverlayEl || !modalUserPromptEl || !modalRefinementCheckboxEl || !numVariationsSliderEl || !modelSelEl || !modalContextSizeValueEl || !modalMaxTokensValueEl || !modalMaxTokensSliderEl) return;
+
+    updateModelSpecificUI(modelSelEl.value); // Update UI based on current model when modal opens
+
+    modalRefinementCheckboxEl.checked = (activeTimelineIndex !== -1);
+    numVariationsSliderEl.value = lastGenerationConfig.numVariations;
+    if(numVariationsValueDisplayEl) numVariationsValueDisplayEl.textContent = numVariationsSliderEl.value;
+    
+    // modalThinkingBudgetSliderEl.value = lastGenerationConfig.thinkingBudget; // Removed
+    // if(modalThinkingBudgetValueDisplayEl) modalThinkingBudgetValueDisplayEl.textContent = lastGenerationConfig.thinkingBudget; // Removed
+
+    // Animation handling
+    promptModalOverlayEl.classList.remove('modal-anim-fade-out');
+    promptModalOverlayEl.style.display = 'flex'; // Or 'block' if that was its original display type
+    promptModalOverlayEl.classList.add('modal-anim-fade-in');
+    // promptModalOverlayEl.classList.add('visible'); // Keep this if it controls other things besides opacity/visibility
+
+    modalUserPromptEl.focus();
+}
+
+function hidePromptModal() {
+    if (!promptModalOverlayEl) return;
+
+    promptModalOverlayEl.classList.remove('modal-anim-fade-in');
+    promptModalOverlayEl.classList.add('modal-anim-fade-out');
+
+    // Wait for animation to finish before hiding
+    const handleAnimationEnd = () => {
+        promptModalOverlayEl.style.display = 'none';
+        // promptModalOverlayEl.classList.remove('visible'); // Keep this if it controls other things
+        promptModalOverlayEl.removeEventListener('animationend', handleAnimationEnd);
+    };
+    promptModalOverlayEl.addEventListener('animationend', handleAnimationEnd);
+}
+
+function handleModalGenerate() {
+    if (!modalUserPromptEl || !modalGenerateBtnEl) return;
+    const modalPrompt = modalUserPromptEl.value.trim();
+    if (modalPrompt) {
+        hidePromptModal();
+        if (!modalGenerateBtnEl.disabled) {
+            generateVariations();
+        }
+    } else {
+        console.warn("Modal prompt is empty. Not generating.");
+    }
+}
+
+// --- Config Modal Logic ---
+function showConfigModal() {
+    if (!configModalOverlayEl) return;
+
+    // Animation handling
+    configModalOverlayEl.classList.remove('modal-anim-fade-out');
+    configModalOverlayEl.style.display = 'flex'; // Or 'block'
+    configModalOverlayEl.classList.add('modal-anim-fade-in');
+    // configModalOverlayEl.classList.add('visible');
+}
+function hideConfigModal() {
+    if (!configModalOverlayEl) return;
+
+    configModalOverlayEl.classList.remove('modal-anim-fade-in');
+    configModalOverlayEl.classList.add('modal-anim-fade-out');
+
+    const handleAnimationEnd = () => {
+        configModalOverlayEl.style.display = 'none';
+        // configModalOverlayEl.classList.remove('visible');
+        configModalOverlayEl.removeEventListener('animationend', handleAnimationEnd);
+    };
+    configModalOverlayEl.addEventListener('animationend', handleAnimationEnd);
+}
+
+// --- Confirmation Modal Logic ---
+function showConfirmModal(message, onConfirmCallback) {
+    if (!confirmModalOverlayEl || !confirmModalMessageEl || !confirmModalConfirmBtnEl || !confirmModalCancelBtnEl) {
+        console.error("Confirmation modal elements not found!");
+        // Fallback to default confirm if modal elements are missing
+        if (confirm(message)) { 
+            onConfirmCallback(); 
+        }
+        return;
+    }
+
+    confirmModalMessageEl.textContent = message;
+    currentConfirmCallback = onConfirmCallback; // Store the callback
+
+    // Clear previous listeners (important!)
+    confirmModalConfirmBtnEl.replaceWith(confirmModalConfirmBtnEl.cloneNode(true));
+    confirmModalCancelBtnEl.replaceWith(confirmModalCancelBtnEl.cloneNode(true));
+    // Re-find buttons after cloning
+    confirmModalConfirmBtnEl = document.getElementById('confirm-modal-confirm-button');
+    confirmModalCancelBtnEl = document.getElementById('confirm-modal-cancel-button');
+
+    // Add new listeners
+    confirmModalConfirmBtnEl.addEventListener('click', handleConfirm); 
+    confirmModalCancelBtnEl.addEventListener('click', hideConfirmModal);
+
+    // Show modal with animation
+    confirmModalOverlayEl.classList.remove('modal-anim-fade-out');
+    confirmModalOverlayEl.style.display = 'flex'; 
+    confirmModalOverlayEl.classList.add('modal-anim-fade-in');
+}
+
+function hideConfirmModal() {
+    if (!confirmModalOverlayEl) return;
+
+    confirmModalOverlayEl.classList.remove('modal-anim-fade-in');
+    confirmModalOverlayEl.classList.add('modal-anim-fade-out');
+
+    const handleAnimationEnd = () => {
+        confirmModalOverlayEl.style.display = 'none';
+        currentConfirmCallback = null; // Clear callback when hidden
+        confirmModalOverlayEl.removeEventListener('animationend', handleAnimationEnd);
+    };
+    confirmModalOverlayEl.addEventListener('animationend', handleAnimationEnd);
+}
+
+function handleConfirm() {
+    hideConfirmModal();
+    if (typeof currentConfirmCallback === 'function') {
+        currentConfirmCallback(); // Execute the stored callback
+    }
+    currentConfirmCallback = null; // Clear callback after execution
+}
+
+// --- History Navigation Logic ---
+function navigateToPreviousHistory() {
+    if (activeTimelineIndex > 0) {
+        handleHistoryItemClick(activeTimelineIndex - 1);
+    }
+}
+
+function navigateToNextHistory() {
+    if (activeTimelineIndex < evolutionTimeline.length - 1) {
+        handleHistoryItemClick(activeTimelineIndex + 1);
+    }
+}
+
+function updateHistoryNavigationButtons() {
+    if (!historyNavLeftBtnEl || !historyNavRightBtnEl) return;
+    historyNavLeftBtnEl.disabled = activeTimelineIndex <= 0;
+    historyNavRightBtnEl.disabled = activeTimelineIndex >= evolutionTimeline.length - 1;
+}
+
+// --- Helper function to call Gemini for code splitting ---
+async function fetchCodeSplitFromGemini(apiKey, fullHtmlContent) {
+    const exportModelName = "gemini-2.5-flash-preview-04-17"; // Hardcoded model for export
+    const API_ENDPOINT = `${API_BASE_URL}${exportModelName}:generateContent?key=${apiKey}`;
+    const prompt = `
+You are an expert web developer. You are given a single HTML document that might contain inline CSS within <style> tags and inline JavaScript within <script> tags. Your task is to separate this document into three distinct components: HTML structure, CSS styles, and JavaScript code.
+
+Follow these instructions carefully:
+1.  **HTML Output**: This should be the main HTML structure. 
+    *   If there were inline <style> tags, remove them. Add a <link rel="stylesheet" href="style.css"> in the <head> instead.
+    *   If there were inline <script> tags (especially those not setting up initial variables or configurations that need to be in the head), try to move their content to what will become an external script.js file. Add <script src="script.js" defer><\\/script> before the closing </body> tag. For simple, short scripts that are clearly for page setup and are in the head, they can sometimes remain, but prefer externalizing functional code.
+    *   Ensure the HTML output is clean and well-formed.
+2.  **CSS Output**: This should contain ALL CSS rules extracted from any <style>...</style> blocks in the original HTML. If no <style> blocks were present, this should be an empty string or a comment indicating no CSS.
+3.  **JavaScript Output**: This should contain ALL JavaScript code extracted from any <script>...</script> blocks (that are not JSON-LD or other non-executable script types). If no functional <script> blocks were present, this should be an empty string or a comment indicating no JavaScript.
+
+Provide the output STRICTLY as a JSON object with the following keys: "html_code", "css_code", "js_code".
+
+Example of desired JSON output format:
+{
+  "html_code": "<!DOCTYPE html>...<link rel=\\\"stylesheet\\\" href=\\\"style.css\\\"><script src=\\\"script.js\\\" defer><\\/script></body></html>",
+  "css_code": "body { font-family: sans-serif; } ...",
+  "js_code": "console.log(\\\'Hello World!\\\'); ...\"
+}
+
+Original HTML content:
+\`\`\`html
+${fullHtmlContent}\n\`\`\`
+
+Return ONLY the JSON object. Do not include any other explanatory text or markdown formatting outside the JSON structure itself.
+`;
+
+    try {
+        const response = await fetch(API_ENDPOINT, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ contents: [{ parts: [{ text: prompt }] }] })
+        });
+
+        if (!response.ok) {
+            const errorData = await response.json().catch(() => null);
+            const errorMsg = errorData?.error?.message || `HTTP Error: ${response.status}`;
+            console.error('Gemini API Error:', errorMsg);
+            throw new Error(`API Error: ${errorMsg}`);
+        }
+
+        const responseData = await response.json();
+        const candidate = responseData.candidates?.[0];
+        if (candidate?.content?.parts?.[0]?.text) {
+            let rawText = candidate.content.parts[0].text;
+            console.log("Raw response from Gemini for splitting:", rawText); // Log the raw response
+
+            let jsonString = null;
+
+            // Attempt 1: Look for JSON within markdown code blocks
+            const markdownJsonMatch = rawText.match(/```json\n(\{[\s\S]*\})\n```/s) || rawText.match(/```\n(\{[\s\S]*\})\n```/s);
+            if (markdownJsonMatch && markdownJsonMatch[1]) {
+                jsonString = markdownJsonMatch[1];
+            } else {
+                // Attempt 2: Fallback to existing regex if no markdown block found or it's malformed
+                const directJsonMatch = rawText.match(/\{.*\}/s);
+                if (directJsonMatch) {
+                    jsonString = directJsonMatch[0];
+                }
+            }
+
+            if (jsonString) {
+                try {
+                    return JSON.parse(jsonString);
+                } catch (parseError) {
+                    console.error("Failed to parse JSON string from model:", jsonString, parseError);
+                    throw new Error("JSON parsing failed after attempting to clean model response."); // Simplified error
+                }
+            }
+            throw new Error("Clean JSON object not found in model's response after attempting to extract.");
+        }
+        throw new Error("No valid content found in model's response.");
+
+    } catch (error) {
+        console.error('Error fetching or parsing split code:', error);
+        throw error; // Re-throw to be caught by caller
+    }
+}
+
+// --- Full Prompt Display Modal Logic ---
+function showFullPromptModal(fullPrompt) {
+    if (!promptDisplayModalOverlayEl || !fullPromptTextEl) return;
+
+    fullPromptTextEl.textContent = fullPrompt;
+
+    // Animation handling
+    promptDisplayModalOverlayEl.classList.remove('modal-anim-fade-out');
+    promptDisplayModalOverlayEl.style.display = 'flex';
+    promptDisplayModalOverlayEl.classList.add('modal-anim-fade-in');
+}
+
+function hideFullPromptModal() {
+    if (!promptDisplayModalOverlayEl) return;
+
+    promptDisplayModalOverlayEl.classList.remove('modal-anim-fade-in');
+    promptDisplayModalOverlayEl.classList.add('modal-anim-fade-out');
+
+    const handleAnimationEnd = () => {
+        promptDisplayModalOverlayEl.style.display = 'none';
+        promptDisplayModalOverlayEl.removeEventListener('animationend', handleAnimationEnd);
+    };
+    promptDisplayModalOverlayEl.addEventListener('animationend', handleAnimationEnd);
+}
+
+// --- Initialization ---
+document.addEventListener('DOMContentLoaded', () => {
+    console.log("DOMContentLoaded event fired.");
+
+    apiKeyEl = document.getElementById('api-key');
+    modelSelEl = document.getElementById('model-select');
+    const codeOutputPre = document.getElementById('code-output');
+    if (codeOutputPre) { codeOutputEl = codeOutputPre.querySelector('code'); } else { console.error("Code output <pre> not found");}
+    errorMessageEl = document.getElementById('error-message');
+    refinementLoadingIndicator = document.getElementById('refinement-loading-indicator');
+    mainContentEl = document.getElementById('main-content');
+    configButtonEl = document.getElementById('config-button');
+    intervalSliderEl = document.getElementById('preview-interval-slider');
+    intervalValueDisplayEl = document.getElementById('interval-value');
+    fullscreenOverlayEl = document.getElementById('fullscreen-overlay');
+    fullscreenIframeEl = document.getElementById('fullscreen-iframe');
+    exitFullscreenBtnEl = document.getElementById('exit-fullscreen-btn');
+    perspectiveViewportEl = document.getElementById('perspective-viewport');
+    previewGridWrapperEl = document.getElementById('preview-grid-wrapper');
+    historyPanelEl = document.getElementById('history-panel');
+    historyPanelPlaceholderEl = document.getElementById('history-panel-placeholder');
+    selectedCodeTitleH3El = document.getElementById('selected-code-title');
+    mainContentTitleH1El = document.getElementById('main-content-title');
+    mainContentSubtitleH2El = document.getElementById('main-content-subtitle');
+    fullscreenHistoryNavEl = document.getElementById('fullscreen-history-nav');
+    historyNavPrevBtnEl = document.getElementById('history-nav-prev');
+    historyNavNextBtnEl = document.getElementById('history-nav-next');
+    promptModalOverlayEl = document.getElementById('prompt-modal-overlay');
+    promptModalContentEl = document.getElementById('prompt-modal-content');
+    modalUserPromptEl = document.getElementById('modal-user-prompt');
+    modalGenerateBtnEl = document.getElementById('modal-generate-button');
+    modalCancelBtnEl = document.getElementById('modal-cancel-button');
+    modalLoadingIndicatorEl = document.getElementById('modal-loading-indicator');
+    modalRefinementCheckboxEl = document.getElementById('modal-refinement-checkbox');
+    numVariationsSliderEl = document.getElementById('num-variations-slider');
+    numVariationsValueDisplayEl = document.getElementById('num-variations-value');
+    configModalOverlayEl = document.getElementById('config-modal-overlay');
+    configModalContentEl = document.getElementById('config-modal-content');
+    configModalCloseBtnEl = document.getElementById('config-modal-close-button');
+    copyCodeButtonEl = document.getElementById('copy-code-button');
+    exportCodeButtonEl = document.getElementById('export-code-button');
+    historyToggleButtonEl = document.getElementById('history-toggle-button');
+    historyArrowDownEl = document.getElementById('history-arrow-down');
+    historyArrowUpEl = document.getElementById('history-arrow-up');
+    newButtonEl = document.getElementById('new-button');
+    confirmModalOverlayEl = document.getElementById('confirm-modal-overlay');
+    confirmModalMessageEl = document.getElementById('confirm-modal-message');
+    confirmModalConfirmBtnEl = document.getElementById('confirm-modal-confirm-button');
+    confirmModalCancelBtnEl = document.getElementById('confirm-modal-cancel-button');
+    historyNavLeftBtnEl = document.getElementById('history-nav-left-button');
+    historyNavRightBtnEl = document.getElementById('history-nav-right-button');
+    promptDisplayModalOverlayEl = document.getElementById('prompt-display-modal-overlay');
+    promptDisplayModalContentEl = document.getElementById('prompt-display-modal-content');
+    fullPromptTextEl = document.getElementById('full-prompt-text');
+    promptDisplayModalCloseBtnEl = document.getElementById('prompt-display-modal-close-button');
+    showPromptModalButtonEl = document.getElementById('show-prompt-modal-button'); // Added
+    modalContextSizeValueEl = document.getElementById('modal-context-size-value'); // Added
+    modalMaxTokensValueEl = document.getElementById('modal-max-tokens-value'); // Added
+    modalMaxTokensSliderEl = document.getElementById('modal-max-tokens-slider'); // Added
+
+    console.log("Checking history toggle elements:");
+    console.log("historyToggleButtonEl:", historyToggleButtonEl);
+    console.log("historyPanelEl:", historyPanelEl);
+    console.log("historyArrowDownEl:", historyArrowDownEl);
+    console.log("historyArrowUpEl:", historyArrowUpEl);
+
+    // --- Check if all required elements exist ---
+    let missingElements = [];
+    const requiredElements = { apiKeyEl, modelSelEl, codeOutputEl, errorMessageEl, refinementLoadingIndicator, mainContentEl, configButtonEl, intervalSliderEl, intervalValueDisplayEl, fullscreenOverlayEl, fullscreenIframeEl, exitFullscreenBtnEl, perspectiveViewportEl, previewGridWrapperEl, historyPanelEl, historyPanelPlaceholderEl, selectedCodeTitleH3El, mainContentTitleH1El, mainContentSubtitleH2El, fullscreenHistoryNavEl, historyNavPrevBtnEl, historyNavNextBtnEl, promptModalOverlayEl, promptModalContentEl, modalUserPromptEl, modalGenerateBtnEl, modalCancelBtnEl, modalLoadingIndicatorEl, modalRefinementCheckboxEl, numVariationsSliderEl, numVariationsValueDisplayEl, configModalOverlayEl, configModalContentEl, configModalCloseBtnEl, copyCodeButtonEl, exportCodeButtonEl, historyToggleButtonEl, historyArrowDownEl, historyArrowUpEl, newButtonEl, confirmModalOverlayEl, confirmModalMessageEl, confirmModalConfirmBtnEl, confirmModalCancelBtnEl, historyNavLeftBtnEl, historyNavRightBtnEl, promptDisplayModalOverlayEl, promptDisplayModalContentEl, fullPromptTextEl, promptDisplayModalCloseBtnEl, showPromptModalButtonEl, modalContextSizeValueEl, modalMaxTokensValueEl, modalMaxTokensSliderEl }; // Added new modal elements
+    for (const key in requiredElements) { if (!requiredElements[key]) { missingElements.push(key); } }
+
+    if (missingElements.length > 0) {
+        console.error("Initialization Error: Critical elements missing!", missingElements);
+        if (document.body) { document.body.innerHTML = `<div class="fixed inset-0 bg-red-900 text-red-200 p-8 flex flex-col items-center justify-center text-center"><h2 class="text-2xl font-bold mb-4">Application Initialization Error</h2><p class="mb-2">Could not find element(s): ${missingElements.join(', ')}.</p><p>Please ensure the HTML structure is correct.</p></div>`; }
+        else { alert(`Initialization Error: Critical elements missing: ${missingElements.join(', ')}.`); }
+        return;
+    }
+
+    // --- Initial UI Setup ---
+    showInitialPreviewStateUI();
+    renderHistoryPanel();
+    updateHistoryNavigationButtons(); // Initial button state
+
+    // --- Event Listeners ---
+    if (newButtonEl) {
+        newButtonEl.addEventListener('click', () => {
+            showConfirmModal(
+                'Start a new session? This will clear the current state.', 
+                () => { location.reload(); } // Pass the reload logic as the callback
+            );
+        });
+    }
+
+    if (configButtonEl) configButtonEl.addEventListener('click', showConfigModal);
+    if (showPromptModalButtonEl) showPromptModalButtonEl.addEventListener('click', showPromptModal); // Added listener for new button
+    if (configModalCloseBtnEl) configModalCloseBtnEl.addEventListener('click', hideConfigModal);
+    if (configModalOverlayEl) configModalOverlayEl.addEventListener('click', (e) => {
+        if (e.target === configModalOverlayEl) { hideConfigModal(); }
+    });
+
+    if (exitFullscreenBtnEl) exitFullscreenBtnEl.addEventListener('click', exitFullscreen);
+    if (historyNavPrevBtnEl) historyNavPrevBtnEl.addEventListener('click', showPreviousHistoryInFullscreen);
+    if (historyNavNextBtnEl) historyNavNextBtnEl.addEventListener('click', showNextHistoryInFullscreen);
+
+    if (modalGenerateBtnEl) modalGenerateBtnEl.addEventListener('click', handleModalGenerate);
+    if (modalCancelBtnEl) modalCancelBtnEl.addEventListener('click', hidePromptModal);
+    if (promptModalOverlayEl) promptModalOverlayEl.addEventListener('click', (e) => {
+        if (e.target === promptModalOverlayEl) { hidePromptModal(); }
+    });
+    if (confirmModalOverlayEl) { // Add overlay click listener for confirm modal
+        confirmModalOverlayEl.addEventListener('click', (e) => {
+            if (e.target === confirmModalOverlayEl) { hideConfirmModal(); }
+        });
+    }
+    if (promptDisplayModalOverlayEl) { // Listener for full prompt display modal overlay click
+        promptDisplayModalOverlayEl.addEventListener('click', (e) => {
+            if (e.target === promptDisplayModalOverlayEl) { hideFullPromptModal(); }
+        });
+    }
+    if (promptDisplayModalCloseBtnEl) { // Listener for full prompt display modal close button
+        promptDisplayModalCloseBtnEl.addEventListener('click', hideFullPromptModal);
+    }
+    if (mainContentSubtitleH2El) { // Listener for clicking the subtitle
+        mainContentSubtitleH2El.addEventListener('click', (e) => {
+            const fullPrompt = e.target.dataset.fullPrompt;
+            if (fullPrompt) { // Check if the data attribute exists (meaning it was truncated)
+                showFullPromptModal(fullPrompt);
+            }
+        });
+    }
+     if (modalUserPromptEl) modalUserPromptEl.addEventListener('keydown', (event) => {
+         if (event.key === 'Enter' && (event.ctrlKey || event.metaKey)) {
+             event.preventDefault(); handleModalGenerate();
+         }
+     });
+    if (numVariationsSliderEl) {
+        numVariationsSliderEl.addEventListener('input', (event) => {
+            if(numVariationsValueDisplayEl) numVariationsValueDisplayEl.textContent = event.target.value;
+        });
+        if(numVariationsValueDisplayEl) numVariationsValueDisplayEl.textContent = numVariationsSliderEl.value;
+    }
+
+    if (intervalSliderEl) {
+        intervalSliderEl.addEventListener('input', (event) => {
+            previewUpdateInterval = parseInt(event.target.value, 10);
+            if(intervalValueDisplayEl) intervalValueDisplayEl.textContent = previewUpdateInterval;
+        });
+        previewUpdateInterval = parseInt(intervalSliderEl.value, 10);
+        if(intervalValueDisplayEl) intervalValueDisplayEl.textContent = previewUpdateInterval;
+    }
+
+    if (copyCodeButtonEl) {
+        copyCodeButtonEl.addEventListener('click', () => {
+            if (codeOutputEl && codeOutputEl.textContent && codeOutputEl.textContent !== '// Select a variation or history item to view its code.') {
+                const textToCopy = codeOutputEl.textContent;
+                const textArea = document.createElement("textarea");
+                textArea.value = textToCopy;
+                textArea.style.position = "fixed"; // Prevent scrolling to bottom
+                document.body.appendChild(textArea);
+                textArea.focus();
+                textArea.select();
+                try {
+                    const successful = document.execCommand('copy');
+                    if (successful) {
+                        const originalText = copyCodeButtonEl.innerHTML;
+                        copyCodeButtonEl.innerHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-check inline-block mr-1"><polyline points="20 6 9 17 4 12"></polyline></svg> Copied!`;
+                        copyCodeButtonEl.classList.add('copied');
+                        setTimeout(() => {
+                            copyCodeButtonEl.innerHTML = originalText;
+                            copyCodeButtonEl.classList.remove('copied');
+                        }, 2000);
+                    } else {
+                        console.error('Fallback: Failed to copy code using execCommand.');
+                    }
+                } catch (err) {
+                    console.error('Fallback: Error copying code using execCommand: ', err);
+                }
+                document.body.removeChild(textArea);
+            }
+        });
+    }
+
+    if (exportCodeButtonEl) {
+        exportCodeButtonEl.addEventListener('click', async () => {
+            const currentCode = codeOutputEl?.textContent;
+            const apiKey = apiKeyEl?.value;
+
+            if (!currentCode || currentCode.startsWith('//') || currentCode.trim() === '') {
+                alert('No code selected or available to export.');
+                return;
+            }
+            if (!apiKey) {
+                alert('API Key is missing. Please configure it in settings.');
+                showConfigModal(); // Show config modal if API key is missing
+                return;
+            }
+            if (typeof JSZip === 'undefined') {
+                alert('JSZip library is not loaded. Export cannot proceed.');
+                console.error("JSZip is not defined!");
+                return;
+            }
+
+            const originalButtonContent = exportCodeButtonEl.innerHTML;
+            exportCodeButtonEl.disabled = true;
+            exportCodeButtonEl.innerHTML = '<svg class="animate-spin h-4 w-4" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"><circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle><path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path></svg> Exporting...';
+
+            try {
+                const splitCode = await fetchCodeSplitFromGemini(apiKey, currentCode);
+                
+                if (!splitCode || typeof splitCode.html_code === 'undefined' || typeof splitCode.css_code === 'undefined' || typeof splitCode.js_code === 'undefined') {
+                    throw new Error('Invalid response structure from code splitting model.');
+                }
+
+                const zip = new JSZip();
+                zip.file("index.html", splitCode.html_code);
+                zip.file("style.css", splitCode.css_code);
+                zip.file("script.js", splitCode.js_code);
+
+                const zipBlob = await zip.generateAsync({ type: "blob" });
+                
+                const downloadLink = document.createElement('a');
+                downloadLink.href = URL.createObjectURL(zipBlob);
+                downloadLink.download = "exported_code.zip";
+                document.body.appendChild(downloadLink);
+                downloadLink.click();
+                document.body.removeChild(downloadLink);
+                URL.revokeObjectURL(downloadLink.href); 
+
+                exportCodeButtonEl.innerHTML = originalButtonContent;
+
+            } catch (error) {
+                console.error("Export failed:", error);
+                alert(`Export failed: ${error.message}`);
+                exportCodeButtonEl.innerHTML = originalButtonContent;
+            } finally {
+                exportCodeButtonEl.disabled = false;
+            }
+        });
+    }
+
+    if (historyToggleButtonEl && historyPanelEl && historyArrowDownEl && historyArrowUpEl) {
+        historyToggleButtonEl.addEventListener('click', () => {
+            const isCollapsed = historyPanelEl.classList.toggle('history-collapsed');
+            const rootStyles = getComputedStyle(document.documentElement);
+            const expandedHeight = rootStyles.getPropertyValue('--history-panel-expanded-height').trim();
+            const collapsedHeight = rootStyles.getPropertyValue('--history-panel-collapsed-height').trim();
+
+            if (isCollapsed) {
+                document.documentElement.style.setProperty('--history-panel-current-height', collapsedHeight);
+                historyArrowDownEl.classList.add('hidden');
+                historyArrowUpEl.classList.remove('hidden');
+            } else {
+                document.documentElement.style.setProperty('--history-panel-current-height', expandedHeight);
+                historyArrowDownEl.classList.remove('hidden');
+                historyArrowUpEl.classList.add('hidden');
+                // Ensure content is visible if re-expanding and it was set to display:none directly
+                // This is now handled by the .history-collapsed CSS rule for children.
+                 renderHistoryPanel(); // Re-render to ensure items are correctly displayed if they were hidden
+            }
+        });
+    }
+
+    if (historyNavLeftBtnEl) {
+        historyNavLeftBtnEl.addEventListener('click', navigateToPreviousHistory);
+    }
+    if (historyNavRightBtnEl) {
+        historyNavRightBtnEl.addEventListener('click', navigateToNextHistory);
+    }
+
+    // Keyboard Shortcuts Listener
+    document.addEventListener('keydown', (event) => {
+        if (event.key === 'Escape') {
+            // Check style.display instead of .visible class for animated modals
+            if (configModalOverlayEl.style.display !== 'none' && !configModalOverlayEl.classList.contains('modal-anim-fade-out')) {
+                hideConfigModal();
+            } else if (promptModalOverlayEl.style.display !== 'none' && !promptModalOverlayEl.classList.contains('modal-anim-fade-out')) {
+                 hidePromptModal();
+            } else if (confirmModalOverlayEl.style.display !== 'none' && !confirmModalOverlayEl.classList.contains('modal-anim-fade-out')) { // Add Escape handler for confirm modal
+                 hideConfirmModal();
+            } else if (promptDisplayModalOverlayEl.style.display !== 'none' && !promptDisplayModalOverlayEl.classList.contains('modal-anim-fade-out')) { // Add Escape handler for prompt display modal
+                 hideFullPromptModal();
+            } else if (document.body.classList.contains('fullscreen-active')) {
+                exitFullscreen();
+            }
+        }
+        const targetTagName = event.target ? event.target.tagName.toLowerCase() : null;
+        const isTypingInInputOrTextarea = targetTagName === 'input' || targetTagName === 'textarea';
+
+        if (document.body.classList.contains('fullscreen-active') && currentFullscreenHistoryIndex !== -1 && !isTypingInInputOrTextarea) {
+            if (event.key.toLowerCase() === 'w') {
+                event.preventDefault();
+                showPreviousHistoryInFullscreen();
+            } else if (event.key.toLowerCase() === 'd') {
+                event.preventDefault();
+                showNextHistoryInFullscreen();
+            }
+        }
+        if (event.altKey && !isTypingInInputOrTextarea) {
+            if (event.key.toLowerCase() === 'p' || event.code === 'KeyP') {
+                event.preventDefault();
+                if (!promptModalOverlayEl.classList.contains('visible') && !configModalOverlayEl.classList.contains('visible')) {
+                     showPromptModal();
+                }
+            }
+            else if (event.key.toLowerCase() === 'j' || event.code === 'KeyJ') {
+                event.preventDefault();
+                if (lastGenerationConfig.prompt) {
+                    console.log("Alt+J: Regenerating with last settings:", lastGenerationConfig);
+                    modalUserPromptEl.value = lastGenerationConfig.prompt;
+                    modalRefinementCheckboxEl.checked = lastGenerationConfig.isRefinement;
+                    numVariationsSliderEl.value = lastGenerationConfig.numVariations;
+                    if(numVariationsValueDisplayEl) numVariationsValueDisplayEl.textContent = numVariationsSliderEl.value;
+                    // Lines below referencing removed elements must be commented out:
+                    // modalThinkingBudgetSliderEl.value = lastGenerationConfig.thinkingBudget; 
+                    // if(modalThinkingBudgetValueDisplayEl) modalThinkingBudgetValueDisplayEl.textContent = lastGenerationConfig.thinkingBudget;
+
+                    if (lastGenerationConfig.isRefinement) {
+                        activeTimelineIndex = lastGenerationConfig.refinedTimelineIndex;
+                    }
+                    handleModalGenerate();
+                } else {
+                    console.log("Alt+J: No last generation settings found. Opening prompt modal.");
+                    showPromptModal();
+                }
+            }
+            else if (event.key.toLowerCase() === 'o' || event.code === 'KeyO') {
+                event.preventDefault();
+                 if (!configModalOverlayEl.classList.contains('visible') && !promptModalOverlayEl.classList.contains('visible')) {
+                    showConfigModal();
+                }
+            }
+            // History navigation shortcuts (non-fullscreen)
+            if (event.key === 'PageUp') {
+                event.preventDefault();
+                navigateToPreviousHistory();
+            } else if (event.key === 'PageDown') {
+                event.preventDefault();
+                navigateToNextHistory();
+            }
+        }
+    });
+    console.log("Initialization setup complete.");
+
+    if (modelSelEl) { // Add event listener for model selection change
+        modelSelEl.addEventListener('change', (event) => {
+            updateModelSpecificUI(event.target.value);
+        });
+    }
+
+    if (modalMaxTokensSliderEl) { // Add event listener for max tokens slider
+        modalMaxTokensSliderEl.addEventListener('input', (event) => {
+            if (modalMaxTokensValueEl) {
+                // Convert the slider value to a number and then to a locale string
+                const numericValue = parseInt(event.target.value, 10);
+                modalMaxTokensValueEl.textContent = numericValue.toLocaleString();
+            }
+        });
+    }
+}); 
+
+// --- Function to Update Model-Specific UI Elements ---
+function updateModelSpecificUI(selectedModelName) {
+    if (!modalContextSizeValueEl || !modalMaxTokensValueEl || !modalMaxTokensSliderEl) return;
+
+    const details = MODEL_DETAILS[selectedModelName];
+    if (details) {
+        modalContextSizeValueEl.textContent = details.context.toLocaleString();
+        
+        modalMaxTokensSliderEl.min = 256; // A sensible minimum
+        modalMaxTokensSliderEl.max = details.maxOutput;
+        
+        // Set the slider to the model's maximum output tokens by default
+        let defaultValue = details.maxOutput; 
+        // Ensure it's not less than the slider's defined minimum (though maxOutput should always be higher)
+        defaultValue = Math.max(parseInt(modalMaxTokensSliderEl.min, 10), defaultValue); 
+        modalMaxTokensSliderEl.value = defaultValue; 
+        modalMaxTokensValueEl.textContent = defaultValue.toLocaleString();
+
+        // Adjust step for very large ranges if necessary, or keep it fixed.
+        // For simplicity, keeping step fixed for now as defined in HTML or can be dynamic.
+        // Example: if maxOutput is very large, step might be larger.
+        if (details.maxOutput > 32000) {
+            modalMaxTokensSliderEl.step = 512;
+        } else if (details.maxOutput > 8000) {
+            modalMaxTokensSliderEl.step = 256;
+        } else {
+            modalMaxTokensSliderEl.step = 128;
+        }
+
+    } else {
+        modalContextSizeValueEl.textContent = "N/A";
+        modalMaxTokensValueEl.textContent = "N/A";
+        modalMaxTokensSliderEl.min = 256;
+        modalMaxTokensSliderEl.max = 4096; // Default if model not found
+        modalMaxTokensSliderEl.value = 1024;
+        modalMaxTokensSliderEl.step = 128;
+    }
+}