<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>2000-Row Stepped Black Gradient</title>
  <style>
    body { margin: 0; padding: 20px; font-family: sans-serif; background: #ffffff; }
    .hr-2000-container { display: flex; flex-direction: column; width: 100%; margin: 20px 0; }
    .hr-row { width: 100%; height: 1px; background-color: #000000; }
  </style>
</head>
<body>
  <h2>2,000-Row Stepped Black-to-Transparent HR</h2>

  <!-- 2,000-Row Gradient Container -->
  <div class="hr-2000-container" id="gradientHr"></div>

  <p>Content following the 2,000-row gradient divider.</p>

  <script>
    (function generate2000Rows() {
      const container = document.getElementById('gradientHr');
      const fragment = document.createDocumentFragment();
      const totalRows = 2000;
      for (let i = 0; i < totalRows; i++) {
        const row = document.createElement('div');
        row.className = 'hr-row';
        // Calculate exact step: Row 1 = 1.0 opacity, Row 2000 = 0.0 opacity
        const opacity = (1 - (i / (totalRows - 1))).toFixed(5);
        row.style.opacity = opacity;
        fragment.appendChild(row);
      }
      container.appendChild(fragment);
    })();
  </script>
</body>
</html>

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