def extract_sessions_from_html(html_content):
    # Tách theo khoảng trắng kép <br /><br />
    parts = re.split(r'<br\s*/?\s*><br\s*/?\s*>', cell_html, flags=re.IGNORECASE)
    if len(parts) >= 3:
        description = BeautifulSoup(parts[1], 'html.parser').get_text().strip()
        speaker = BeautifulSoup(parts[2], 'html.parser').get_text().strip()

const baseTime = parseTime('11:00');
const sessionStartMinutes = parseTime(startTime);
const minutesFromBase = sessionStartMinutes - baseTime;
const top = (minutesFromBase / 30) * 80;
const height = Math.max((duration / 30) * 80, 50);

function calculateDurationInMinutes(timeRange) {
  const [start, end] = timeRange.split(' - ');
  const startTime = parseTime(start);
  const endTime = parseTime(end);
  return endTime - startTime;
}

let topOffset = 2;
if (index > 0) {
  const prevSession = sessions[index - 1];
  const prevEndMinutes = parseTime(prevSession.time.split(' - ')[1]);
  if (prevEndMinutes >= sessionStartMinutes) {
    topOffset = 4;
  }
}

.footer-header {
  position: fixed;
  bottom: 0;
  z-index: 180;
}

window.addEventListener('scroll', () => {
  if (calendarHeader.getBoundingClientRect().bottom < 0) {
    footerHeader.style.display = 'grid';
  } else {
    footerHeader.style.display = 'none';
  }
});

@media (max-width: 768px) {
  .calendar-header, .calendar-body, .footer-header {
    grid-template-columns: 80px repeat(3, 1fr);
  }
}
@media (max-width: 480px) {
  .footer-header {
    grid-template-columns: 60px repeat(3, 1fr);
  }
}

function addToGoogleCalendar(session, day) {
  const description = encodeURIComponent(
    `【${currentStage}】${session.description}\n\nSpeaker: ${session.speaker}\n\nAWS Summit Japan 2025`
  );
}