Including one of the following constraints: It must be made with a minimum of HTML5 code using CSS/JS for styling and include customization options. Please write only ONE word for the script. Design a website for an online store that sells LEGO® brand merchandisee products, including their official Lego themedecorative cursors package. Include three high-quality images of different cursor designs inspired by the Harry Potter series, with detailed descriptions and specifications under each image. For every product listing, create a hover effect that changes the cursor'e color to match the theme (magic or muggle) when hovered over. Also, ensure you use semantic HTML5 code for web standards compliance and include lazy-loading optimizations where applicable.

<style type="text/css">
body {
  cursor: url(https://cdn.cutecursors.com/cdn-changecursor/packs/neville-longbottom-lego-cursor/arrow.png) 4 4, auto;
}
a, button, .clickable {
  cursor: url(https://cdn.cutecursors.com/cdn-changecursor/packs/neville-longbottom-lego-cursor/hand.png) 4 4, pointer;
}
</style>
<a href="https://cutecursors.com//category/lego-cursors/neville-longbottom-lego-cursor" title="Get free Neville Longbottom Lego cursors for your website.">
  Neville Longbottom Lego Cursors
</a>