async function processFile() {
        try {
            const fileInput = document.getElementById('fileInput');
            const disclaimerCheck = document.getElementById('disclaimerCheck');
            const statusMessage = document.getElementById('statusMessage');
            const resultDiv = document.getElementById('result');
            const analysisText = document.getElementById('analysisText');
            const analyzeBtn = document.getElementById('analyzeBtn');
            const exportBtn = document.getElementById('exportBtn');

            statusMessage.className = 'error';
            statusMessage.innerText = '';
            resultDiv.classList.add('hidden');
            exportBtn.classList.add('hidden');

            if (fileInput.files.length === 0) {
                statusMessage.innerText = 'Please select a file to analyze.';
                return;
            }

            if (!disclaimerCheck.checked) {
                statusMessage.innerText = 'Please agree to the legal disclaimer before analyzing.';
                return;
            }

            const today = new Date().toDateString();
            
            // Tier-based limit checking
            if (!isPro) {
                // Free tier: exactly 1 upload per day
                let freeUploadDate = localStorage.getItem('freeUploadDate');
                if (freeUploadDate === today && memoryWorking) {
                    statusMessage.innerText = 'Free tier limit reached: Only 1 upload allowed per day. Please upgrade to Pro for more!';
                    return;
                }
            } else {
                // Pro tier: Fair use cap of 25 uploads per day
                let proCount = parseInt(localStorage.getItem('proCount') || '0', 10);
                let proDate = localStorage.getItem('proDate');
                
                if (proDate !== today) {
                    proCount = 0; // Reset counter for a new day
                }
                
                if (proCount >= 25 && memoryWorking) {
                    statusMessage.innerText = 'Pro daily fair-use limit reached (25/25). Limit resets tomorrow.';
                    return;
                }
            }

            const file = fileInput.files[0];
            analyzeBtn.disabled = true;
            
            let documentText = '';
            
            if (file.type === 'application/pdf' || file.name.toLowerCase().endsWith('.pdf')) {
                statusMessage.className = 'loading';
                statusMessage.innerText = 'Step 1: Extracting text from PDF...';
                documentText = await extractTextFromPDF(file);
            } else {
                statusMessage.className = 'loading';
                statusMessage.innerText = 'Step 1: Reading text file...';
                documentText = await file.text();
            }

            statusMessage.className = 'loading';
            statusMessage.innerText = 'Step 2: Sending document to secure backend...';
            
            const analysisResult = await fetchAIAnalysis(documentText);

            // Update usage records
            if (memoryWorking) {
                if (!isPro) {
                    localStorage.setItem('freeUploadDate', today);
                } else {
                    let proCount = parseInt(localStorage.getItem('proCount') || '0', 10);
                    let proDate = localStorage.getItem('proDate');
                    if (proDate !== today) proCount = 0;
                    localStorage.setItem('proCount', proCount + 1);
                    localStorage.setItem('proDate', today);
                }
            }

            statusMessage.innerText = '';
            resultDiv.classList.remove('hidden');
            exportBtn.classList.remove('hidden');
            analysisText.innerHTML = analysisResult;
            
            analyzeBtn.disabled = false;

        } catch (error) {
            console.error(error);
            document.getElementById('statusMessage').className = 'error';
            document.getElementById('statusMessage').innerText = "Failed: " + error.message;
            document.getElementById('analyzeBtn').disabled = false;
        }
    }