feat: implement Tailwind CSS styling based on wireframe design

- Add brand colours, fonts (Space Grotesk/Inter/Fira Code), box shadows to tailwind.config.js
- Add bg-grid-pattern, text-gradient, scrollbar, selection styles to input.css
- Add Google Fonts link and dark-mode body classes to base.html
- Style nav, footer, cookie banner, newsletter form components
- Style homepage: featured article, 12-col editorial grid, sidebar widgets
- Style article list: header, tag filters, horizontal article cards, pagination
- Style article page: hero header, prose body, share sidebar, related cards, comments
- Style code blocks and callout blocks
- CSS output grows from 4.8KB to 24KB with all brand utilities compiled

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

templates/components/nav.html

@@ -1,7 +1,35 @@
-<nav>
-  <a href="/">Home</a>
-  <a href="/articles/">Articles</a>
-  <a href="/about/">About</a>
-  <button type="button" data-theme-toggle>Toggle theme</button>
-  {% include 'components/newsletter_form.html' with source='nav' label='Get updates' %}
+{% load static %}
+<nav class="sticky top-0 z-50 backdrop-blur-md bg-brand-light/80 dark:bg-brand-dark/80 border-b border-zinc-200 dark:border-zinc-800 transition-colors">
+  <div class="max-w-7xl mx-auto px-6 h-20 flex items-center justify-between">
+    <!-- Logo -->
+    <a href="/" class="group flex items-center gap-2">
+      <div class="w-8 h-8 bg-brand-dark dark:bg-brand-light text-brand-light dark:text-brand-dark flex items-center justify-center font-display font-bold text-xl group-hover:rotate-12 transition-transform">
+        /
+      </div>
+      <span class="font-display font-bold text-2xl tracking-tight">NO HYPE AI</span>
+    </a>
+
+    <!-- Desktop Links -->
+    <div class="hidden md:flex items-center gap-8 font-medium">
+      <a href="/" class="hover:text-brand-cyan transition-colors">Home</a>
+      <a href="/articles/" class="hover:text-brand-cyan transition-colors">Articles</a>
+      <a href="/about/" class="hover:text-brand-pink transition-colors">About</a>
+      <!-- Hidden newsletter form for subscribe functionality -->
+      <div class="hidden">
+        {% include 'components/newsletter_form.html' with source='nav' label='Get updates' %}
+      </div>
+      <a href="#newsletter" class="px-5 py-2.5 bg-brand-dark dark:bg-brand-light text-brand-light dark:text-brand-dark font-display font-bold hover:-translate-y-1 hover:shadow-solid-dark dark:hover:shadow-solid-light transition-all border border-transparent dark:border-zinc-700">Subscribe</a>
+    </div>
+
+    <!-- Theme Toggle -->
+    <div class="flex items-center gap-4">
+      <button type="button" data-theme-toggle class="p-2 rounded-full hover:bg-zinc-200 dark:hover:bg-zinc-800 transition-colors" aria-label="Toggle Dark Mode">
+        <svg class="w-5 h-5 hidden dark:block text-yellow-400" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" d="M12 3v2.25m6.364.386-1.591 1.591M21 12h-2.25m-.386 6.364-1.591-1.591M12 18.75V21m-4.773-4.227-1.591 1.591M5.25 12H3m4.227-4.773L5.636 5.636M15.75 12a3.75 3.75 0 1 1-7.5 0 3.75 3.75 0 0 1 7.5 0Z" /></svg>
+        <svg class="w-5 h-5 block dark:hidden text-zinc-700" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" d="M21.752 15.002A9.72 9.72 0 0 1 18 15.75c-5.385 0-9.75-4.365-9.75-9.75 0-1.33.266-2.597.748-3.752A9.753 9.753 0 0 0 3 11.25C3 16.635 7.365 21 12.75 21a9.753 9.753 0 0 0 9.002-5.998Z" /></svg>
+      </button>
+      <button class="md:hidden p-2 hover:bg-zinc-100 dark:hover:bg-zinc-800 rounded transition-colors" aria-label="Open menu">
+        <svg class="w-6 h-6" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" d="M3.75 6.75h16.5M3.75 12h16.5m-16.5 5.25h16.5" /></svg>
+      </button>
+    </div>
+  </div>
 </nav>