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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>Chapter 13: CSS Cascading</title>
  <link rel="stylesheet" href="style.css">
  <style>
    /* For Rule 1 demo */
    h1 {
      color: green;
    }
    h1 {
      color: blue;
    }

    /* For Rule 2 demo */
    /* Universal */
    * {
      font-family: Arial, sans-serif;
    }
    h2 {
      color: orange;
    }
    body h2 {
      color: yellow;
    }
    .heading {
      color: green;
    }
    body .heading {
      color: blue;
    }
    .heading.first {
      color: indigo;
    }
    #heading-one {
      color: violet;
    }

    /* For Rule 3 demo */
    #inline-demo {
      color: green;
    }

    /* For Rule 4 demo */
    #important-demo {
      color: green !important;
    }

    /* For Inheritance demo */
    .parent {
      color: red;
    }
    .line {
      color: green;
    }
    .first-line {
      color: inherit;
    }
  </style>
</head>
<body>
  <h2 class="chapter-header">Chapter 13: CSS Cascading</h2>

  <!-- Rule 1 -->
  <div class="tag-section">
    <h3>Rule 1: The Last Declaration Wins</h3>
    <div class="tag-demo">
      <div class="head-demo">
        <h1>My First Heading (should be blue)</h1>
        <p>My first paragraph.</p>
      </div>
    </div>
  </div>

  <!-- Rule 2 -->
  <div class="tag-section">
    <h3>Rule 2: The More Specific Selector Wins</h3>
    <div class="tag-demo">
      <div class="head-demo">
        <h2 id="heading-one" class="heading first">My First Heading</h2>
        <p>First paragraph.</p>
        <h2 id="heading-two" class="heading">My Second Heading</h2>
        <p>Second paragraph.</p>
      </div>
    </div>
  </div>

  <!-- Rule 3 -->
  <div class="tag-section">
    <h3>Rule 3: Inline Style Overrides Internal/External</h3>
    <div class="tag-demo">
      <div class="head-demo">
        <h2 id="inline-demo" style="color: red">This heading is red (inline wins)</h2>
      </div>
    </div>
  </div>

  <!-- Rule 4 -->
  <div class="tag-section">
    <h3>Rule 4: !important Is the Strongest</h3>
    <div class="tag-demo">
      <div class="head-demo">
        <h2 id="important-demo" style="color: red">
          This heading is green (!important wins over inline)
        </h2>
      </div>
    </div>
  </div>

  <!-- Inheritance -->
  <div class="tag-section">
    <h3>Inheritance</h3>
    <div class="tag-demo">
      <div class="head-demo">
        <article class="parent">
          <h3>Parent Heading</h3>
          <p class="line first-line">First line (inherits red from parent).</p>
          <p class="line second-line">Second line (overridden to green).</p>
        </article>
      </div>
    </div>
  </div>
</body>
</html>