Build a Modern Glassmorphism Dashboard Using Only CSS

<blockquote><span class="s1">Create a </span><b>modern dashboard UI</b><span class="s1"> using </span><b>glassmorphism design</b><span class="s1">, built with </span><b>HTML + CSS only</b><span class="s1">.</span></blockquote>
<blockquote><b>UI requirements:</b><b></b></blockquote>
<ul>
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<blockquote>Sidebar navigation</blockquote>
</li>
<li>
<blockquote>Top header</blockquote>
</li>
<li>
<blockquote>3–4 content cards</blockquote>
</li>
<li>
<blockquote>One stats or info panel</blockquote>
</li>
</ul>
<blockquote><b>Design constraints:</b><b></b></blockquote>
<ul>
<li>
<blockquote>Glass / frosted effect using CSS</blockquote>
</li>
<li>
<blockquote>Subtle shadows and blur</blockquote>
</li>
<li>
<blockquote>Responsive layout (desktop → mobile)</blockquote>
</li>
<li>
<blockquote>No JavaScript</blockquote>
</li>
<li>
<blockquote>No frameworks</blockquote>
</li>
</ul>
<blockquote><b>Deliverables:</b><b></b></blockquote>
<ul>
<li>
<blockquote>Clean HTML structure</blockquote>
</li>
<li>
<blockquote>Reusable CSS classes</blockquote>
</li>
<li>
<blockquote>Comments explaining the glass effect</blockquote>
</li>
</ul>