function drawChart() {
  // Create a new DataTable instance
  var data = new google.visualization.DataTable();

  // Define the columns for the DataTable
  data.addColumn('string', 'Task ID');
  data.addColumn('string', 'Task Name');
  data.addColumn('string', 'Resource');
  data.addColumn('date', 'Start Date');
  data.addColumn('date', 'End Date');
  data.addColumn('number', 'Duration');
  data.addColumn('number', 'Percent Complete');
  data.addColumn('string', 'Dependencies');

  // Add the data rows for the chart
  data.addRows([
    ['2024Spring', 'Spring Campaign', 'Marketing',
     new Date(2024, 2, 22), new Date(2024, 5, 20), null, 100, null],
    ['2024Summer', 'Summer Sale', 'Sales',
     new Date(2024, 5, 21), new Date(2024, 8, 20), null, 100, null],
    ['2024Autumn', 'Autumn Collection', 'Creative',
     new Date(2024, 8, 21), new Date(2024, 11, 20), null, 75, null],
    ['2024Winter', 'Winter Promotion', 'Marketing',
     new Date(2024, 11, 21), new Date(2025, 2, 21), null, 50, null],
    ['2025Spring', 'Next Year Planning', 'Management',
     new Date(2025, 2, 22), new Date(2025, 5, 20), null, 10, null],
    ['Testing', 'QA Testing', 'QA',
     new Date(2024, 8, 1), new Date(2024, 10, 15), null, 90, '2024Autumn'],
    ['Launch', 'Product Launch', 'All',
     new Date(2025, 0, 1), new Date(2025, 1, 1), null, 0, '2024Winter']
  ]);

  // Define the chart options
  var options = {
    height: 400,
    gantt: {
      trackHeight: 30
    }
  };

  // Create a new Gantt chart instance
  var chart = new google.visualization.Gantt(document.getElementById('chart_div'));

  // **FIX:** Use the 'ready' event listener to inject the CSS after the chart is drawn.
  // This ensures our style rule is the last one applied.
  google.visualization.events.addListener(chart, 'ready', function () {
    var style = document.createElement('style');
    style.type = 'text/css';
    // This aggressive CSS rule should hide the tooltip.
    style.innerHTML = "div[class*='google-visualization-tooltip'] { display: none !important; }";
    document.head.appendChild(style);
  });

  // Draw the chart
  chart.draw(data, options);
}