Add LHB Engineering case study with reusable header/footer partials and scrollable hero screenshots

includes/cs_header.php

@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * Case Study Header Partial
+ * ─────────────────────────────────────────────────────────────────
+ * Requires the following variables set by the calling page BEFORE
+ * requiring this file:
+ *
+ *   $cs_slug   string   Key into $projects, e.g. 'thompson'
+ *
+ * Everything else ($title, $description, hero content) is read from
+ * $projects[$cs_slug] in data/projects.php.
+ * ─────────────────────────────────────────────────────────────────
+ */
+
+$extra_css   = '/css/portfolio.css';
+require __DIR__ . '/../data/projects.php';
+$p           = $projects[$cs_slug];
+$title       = $p['page_title'];
+$description = $p['page_desc'];
+require __DIR__ . '/header.php';
+?>
+
+<div class="cs-breadcrumb">
+	<a href="/portfolio" class="cs-back">← All Work</a>
+	<span class="cs-breadcrumb-label">[<?= htmlspecialchars($p['num']) ?> / <?= htmlspecialchars($p['code']) ?>]</span>
+</div>
+
+<header class="hero">
+	<div class="hero-label">Case Study — <?= htmlspecialchars($p['num']) ?></div>
+	<h1><?= htmlspecialchars($p['h1'][0]) ?><br><span class="h1-sub"><?= htmlspecialchars($p['h1'][1]) ?></span></h1>
+	<p class="hero-sub"><?= htmlspecialchars($p['sub']) ?></p>
+	<ul class="cs-meta-bar">
+		<li><?= htmlspecialchars($p['stack']) ?></li>
+		<li><?= htmlspecialchars($p['location']) ?></li>
+		<li><?= htmlspecialchars($p['year']) ?></li>
+	</ul>
+</header>