validateAndLoadJson(data, sourceName) {
        if (!Array.isArray(data)) {
            throw new Error('Invalid JSON format: Expected array');
        }

        const isValid = data.every(item => 
            item.text !== undefined && 
            typeof item.start_time === 'number' && 
            typeof item.end_time === 'number'
        );

        if (!isValid) {
            throw new Error('Each item must have: text (string), start_time (number), end_time (number)');
        }

        this.jsonTimestamps = data;
        this.updateJsonUI(sourceName, data.length);
    }

    updateJsonUI(filename, wordCount) {
        const jsonStatus = document.getElementById('json-status');
        const jsonFilename = document.getElementById('json-filename');
        const jsonWordsCount = document.getElementById('json-words-count');
        
        if (jsonStatus && jsonFilename && jsonWordsCount) {
            jsonStatus.classList.remove('hidden');
            jsonFilename.textContent = filename;
            jsonWordsCount.textContent = `${wordCount} palavras`;
            
            // Visual feedback
            const zone = document.getElementById('json-upload-zone');
            zone.classList.add('border-green-500', 'bg-green-100');
            setTimeout(() => {
                zone.classList.remove('border-green-500', 'bg-green-100');
            }, 1000);
        }
    }