Fix: CTA button contrast and author bio class collisions

- Replace btn/btn-secondary on CTA buttons with cta-btn/cta-btn-outline
  (isolated from global .btn-secondary { color: #144784 !important } cascade)
- Rename author-bio inner classes (author-info -> bio-info, etc.) to prevent
  collision with article inline <style> .author-info definitions
- Both issues were CSS class name conflicts, not specificity bugs

includes/article-footer.php

@@ -106,8 +106,8 @@ $display_articles = array_slice($filtered_articles, 0, 3);
             <p>UK Data Services delivers GDPR-compliant web scraping, data extraction, and analytics — tailored to your industry. 99.8% accuracy, fast turnaround, no long-term contracts.</p>
         </div>
         <div class="cta-actions">
-            <a href="/quote.php" class="btn btn-primary">Get a Free Quote</a>
-            <a href="/services/web-scraping.php" class="btn btn-secondary">See Our Services</a>
+            <a href="/quote.php" class="cta-btn cta-btn-primary">Get a Free Quote</a>
+            <a href="/services/web-scraping.php" class="cta-btn cta-btn-outline">See Our Services</a>
         </div>
     </div>
 </section>