flexbox-layout.html

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  <title>9. Flexbox Layout</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Poppins', sans-serif;
      background-color: #1cc9be;
      padding: 20px;
    }
    .section {
      background: rgba(255, 255, 255, 0.3);
      padding: 20px;
      border-radius: 15px;
      max-width: 1000px;
      margin: auto;
      box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    }
    h2, h3 {
      color: #349;
      margin-bottom: 15px;
    }
    p {
      font-size: 18px;
      margin-bottom: 15px;
      line-height: 1.6;
    }
    textarea, iframe {
      width: 100%;
      height: 180px;
      font-size: 16px;
      padding: 10px;
      margin: 10px 0 20px;
      border-radius: 10px;
      border: 2px solid white;
      background: rgba(255,248,240,0.4);
      font-family: monospace;
    }
    iframe {
      margin-top: 10px;
    }
    button {
      background: #007bff;
      color: #fff;
      border: none;
      padding: 8px 20px;
      font-size: 15px;
      font-weight: 500;
      border-radius: 8px;
      cursor: pointer;
      margin-bottom: 20px;
      transition: all 0.3s ease-in-out;
      position: relative;
      overflow: hidden;
    }
    button::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(120deg, #00bcd4, #2196f3);
      transition: all 0.4s ease;
      z-index: -1;
    }
    button:hover::before {
      left: 0;
    }
    button:hover {
      color: #fff;
      box-shadow: 0 4px 10px rgba(0,0,0,0.2);
      transform: translateY(-1px);
    }
    button:active {
      transform: scale(0.95);
      box-shadow: none;
    }
  </style>
</head>
<body>
  <div class="section">
    <h2>9. Flexbox Layout</h2>

    <h3>I. Flex Container & Items</h3>
    <p><strong>Explanation:</strong> Flexbox ek powerful layout tool hai jo container ke andar ke items ko horizontally ya vertically arrange karta hai.<br><br><strong>Important:</strong> Parent ko <code>display: flex</code> dene se wo container ban jata hai aur uske andar ke elements "flex items".</p>

    <textarea id="code1">
<style>
.container {
  display: flex;
  background: lightgray;
  gap: 10px;
  padding: 10px;
}
.box {
  background: #007bff;
  color: white;
  padding: 20px;
  flex: 1;
  text-align: center;
  border-radius: 8px;
}
</style>
<div class="container">
  <div class="box">Item 1</div>
  <div class="box">Item 2</div>
  <div class="box">Item 3</div>
</div>
    </textarea>
    <button onclick="runCode('code1', 'output1')">Run Code</button>
    <iframe id="output1"></iframe>

    <h3>II. Main Axis & Cross Axis</h3>
    <p><strong>Explanation:</strong> Flexbox me 2 axis hote hain — <strong>Main Axis</strong> (direction of flex items) and <strong>Cross Axis</strong> (opposite direction). <br><code>flex-direction</code> se hum main axis ko control karte hain.</p>

    <textarea id="code2">
<style>
.container {
  display: flex;
  flex-direction: column;
  background: #fce4ec;
  padding: 10px;
  gap: 10px;
}
.item {
  background: #ec407a;
  color: white;
  padding: 15px;
  text-align: center;
  border-radius: 8px;
}
</style>
<div class="container">
  <div class="item">Box A</div>
  <div class="item">Box B</div>
  <div class="item">Box C</div>
</div>
    </textarea>
    <button onclick="runCode('code2', 'output2')">Run Code</button>
    <iframe id="output2"></iframe>

    <h3>III. Flex Properties</h3>
    <p><strong>Common Properties:</strong><br>
      <code>justify-content</code> → Horizontal alignment (main axis)<br>
      <code>align-items</code> → Vertical alignment (cross axis)<br>
      <code>gap</code> → Space between items</p>

    <textarea id="code3">
<style>
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
  background: #e0f7fa;
  gap: 20px;
}
.item {
  background: #00acc1;
  color: white;
  padding: 20px;
  border-radius: 10px;
}
</style>
<div class="container">
  <div class="item">A</div>
  <div class="item">B</div>
</div>
    </textarea>
    <button onclick="runCode('code3', 'output3')">Run Code</button>
    <iframe id="output3"></iframe>

    <h3>IV. Practical Layout Example</h3>
    <p><strong>Example:</strong> Responsive Navigation Layout using Flexbox:</p>

    <textarea id="code4">
<style>
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #333;
  color: white;
  padding: 15px 20px;
}
.logo {
  font-size: 20px;
  font-weight: bold;
}
.menu {
  display: flex;
  gap: 15px;
}
.menu a {
  color: white;
  text-decoration: none;
}
</style>
<div class="navbar">
  <div class="logo">MySite</div>
  <div class="menu">
    <a href="#">Home</a>
    <a href="#">Courses</a>
    <a href="#">About</a>
  </div>
</div>
    </textarea>
    <button onclick="runCode('code4', 'output4')">Run Code</button>
    <iframe id="output4"></iframe>

  </div>

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      const doc = iframe.contentDocument || iframe.contentWindow.document;
      doc.open();
      doc.write(code);
      doc.close();
    }
  </script>
</body>
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