Preview:
<!DOCTYPE html>
<html>
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>My Mobile-First Approach</title>
   <style>
     /* Default styles for mobile */
     .grid-container-flex {
       display: flex;
       flex-direction: column;
       background-color: purple;
       font-size: 0.9rem;
       color: white;
       margin-top: 1rem;
       height: 9em;
     }

     .grid-container-grid {
       display: grid;
       grid-template-columns: 20em;
       height: 8em;
       font-size: 1.1rem;
     }

     /* Media query for tablets */
     @media (min-width: 768px) {
       .grid-container-flex {
         font-size: 1.3rem;
       }

       .grid-container-grid {
         grid-template-columns: none;
         height: 10em;
       }
     }

     /* Media query for desktops */
     @media (min-width: 1024px) {
       .grid-container-flex {
         font-size: 2rem;
       }

       .grid-container-grid {
         grid-template-columns: none;
         height: 12em;
       }
     }
   </style>
 </head>
 <body>
   <header>
     <h1>My Mobile-First Approach HTML Structuring</h1>
     <nav>
       <a href="">Home</a>
       <a href="">Shop</a>
       <a href="">Contact</a>
       <a href="">Store</a>
     </nav>
   </header>

   <main>
     <section class="grid-container-flex">
       <h2>About Us</h2>
       <p>We work with skilled artisans and select premium materials to craft footwear that stands the test of time</p>
     </section>

     <section class="grid-container-grid">
       <h2>Our Products</h2>
       <ul>
         <li>Men's shoes</li>
         <li>Women's Shoes</li>
         <li>Kid's Shoes</li>
       </ul>
     </section>

     <section>
       <h2>Contact Us</h2>
       <form>
         <label for="name">Name:</label>
         <input type="text" id="name" name="name">

         <label for="email">Email:</label>
         <input type="email" id="email" name="email">

         <label for="message">Message:</label>
         <textarea id="message" name="message"></textarea>

         <input type="submit" value="Send Message">
       </form>
     </section>
   </main>

   <footer>
     <p>&copy; 2023 My Mobile-First Approach Example. All rights reserved.</p>
   </footer>
 </body>
</html>
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