downloadSection.style.display = "block";
                      } else if (json.error) {
                          alert(`Error from server: ${json.error}`);
                          updateProgress(0);
                          return;
                      }
                  } catch (e) {
                      console.error("Failed to parse JSON chunk:", jsonString, e);
                  }
              }
              boundary = buffer.indexOf("\n");
          }
        }
        
        if (buffer.trim()) {
             try {
                 const json = JSON.parse(buffer.trim());
                 if (json.audio_data || json.chunk_data) {
                     audioBase64 = json.audio_data || json.chunk_data;
                     updateProgress(100);
                     
                     const audioSrc = "data:audio/mp3;base64," + audioBase64;
                     finalAudioPlayer.src = audioSrc;
                     finalResultDiv.style.display = "block";
                     
                     const title = document.getElementById("title").value.trim() || "fsmb-voice";
                     downloadAnchor.href = audioSrc;
                     downloadAnchor.download = title + ".mp3";
                     fileLabel.innerText = "Download: " + title + ".mp3";
                     downloadSection.style.display = "block";
                 }
             } catch (e) {
                 console.error("Failed to parse final JSON chunk:", buffer.trim(), e);
             }
        }

      } catch (error) {
        console.error("Fetch Error:", error);
        alert("Failed to generate audio: " + error.message);
        updateProgress(0);
      }
    }
    
    updateCharCount();
  </script>
</body>
</html>