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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS font-size clamp Example</title>
  <style>
    body {
      margin: 0;
      font-family: system-ui, sans-serif;
      background: #0f172a;
      color: #e2e8f0;
      min-height: 100vh;
      display: grid;
      place-items: center;
      padding: 2rem;
    }

    .hero-title {
      font-size: clamp(1.75rem, 4vw, 3rem);
      line-height: 1.15;
      text-align: center;
      margin: 0;
      max-width: 16ch;
    }

    .hero-sub {
      margin-top: 1rem;
      font-size: 1rem;
      text-align: center;
      color: #94a3b8;
      max-width: 32rem;
    }
  </style>
</head>
<body>
  <div>
    <h1 class="hero-title">Responsive Heading</h1>
    <p class="hero-sub">Resize the browser window to see clamp() keep the title between 1.75rem and 3rem.</p>
  </div>
</body>
</html>

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CSS font-size Property - Responsive clamp()