fix: move homepage hero CSS into MU-plugin for git tracking

- Hide .entry-hero.page-hero-section on homepage (Kadence renders it
  even when _kadence_post_layout title:hide is set)
- Remove 5rem content-area gap above first block on homepage
- .acrib-hero min-height 100svh/100vh (full viewport, transparent header)
- Hero inner container flex-centred with 100px top padding for nav clearance
- Injected via wp_head (priority 5) so it loads before any theme CSS

wp-content/mu-plugins/acrib-core.php

@@ -66,3 +66,19 @@ remove_filter('wp_mail', 'wp_staticize_emoji_for_email');
 if (!defined('WP_POST_REVISIONS')) {
     define('WP_POST_REVISIONS', 3);
 }
+
+// --- Homepage: inject critical CSS to hide Kadence blank title section ---
+// This overrides what's also in Additional CSS so it's version-controlled here.
+add_action('wp_head', function () {
+    if (!is_front_page()) return;
+    echo '<style id="acrib-homepage-fixes">
+/* Remove Kadence blank page-title section above the hero */
+.home .entry-hero.page-hero-section{display:none!important}
+/* Remove Kadence content-area top margin that creates a gap */
+.home .content-area,.home .site-content{margin-top:0!important;padding-top:0!important}
+/* Hero fills exactly one viewport height (transparent header overlaid) */
+.acrib-hero.wp-block-cover{min-height:100svh!important;min-height:100vh!important}
+/* Centre hero content, clear the transparent header */
+.acrib-hero .wp-block-cover__inner-container{display:flex!important;flex-direction:column!important;align-items:center!important;justify-content:center!important;min-height:100svh!important;min-height:100vh!important;padding-top:100px!important;padding-bottom:3rem!important;box-sizing:border-box!important}
+</style>' . "\n";
+}, 5);