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  <title>CSS Best Practices</title>
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    <h1>CSS Best Practices</h1>
    <p class="lead">Clean, maintainable CSS.</p>
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      <h3>Do the right thing</h3>
      <ul>
        <li>Use design tokens (CSS variables) for color/spacing.</li>
        <li>Prefer classes over IDs for reusable styles.</li>
        <li>Keep specificity low. Avoid !important.</li>
        <li>Mobile-first responsive design.</li>
        <li>Group related rules and comment your intent.</li>
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