HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS light-level Fallback Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 2rem;
      margin: 0;
      background: #fff;
      color: #1e293b;
    }

    @media (prefers-color-scheme: dark) {
      body {
        background: #1e293b;
        color: #f1f5f9;
      }
    }

    @media (light-level: dim) {
      body { background: #0f172a; }
    }

    @media (light-level: washed) {
      body {
        background: #cbd5e1;
        color: #1e293b;
      }
    }
  </style>
</head>
<body>
  <h1>Theme Layers</h1>
  <p>color-scheme fallback + experimental light-level refinement.</p>
</body>
</html>

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CSS light-level - With Color-Scheme Fallback