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<!DOCTYPE html>
<html lang="en">
<head>
  <title>Modern alternative to light-level</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0;
      max-width: 40rem;
      line-height: 1.5;
      padding: 12px;
      background: #f8fafc;
      color: #0f172a;
    }

    @media (prefers-color-scheme: dark) {
      p {
        background: #0f172a;
        color: #e2e8f0;
      }
    }

    @media (prefers-contrast: more) {
      p {
        color: #000;
        border: 2px solid currentColor;
      }
    }
  </style>
</head>
<body>
  <p>Prefer <strong>prefers-color-scheme</strong> and <strong>prefers-contrast</strong> — they actually ship.</p>
</body>
</html>

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CSS light-level — modern prefers-* alternative