Fix CSS syntax error: restore missing style tag and fix rel attribute

templates/index.html

@@ -5,7 +5,9 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>得能教育專題展示場 - Telearn Project Showcase</title>
     <!-- Google Fonts -->
-    <link href="https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;800;900&family=Noto+Sans+TC:wght@300;400;700;900&display=swap" rel="stylesh        :root {
+    <link href="https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;800;900&family=Noto+Sans+TC:wght@300;400;700;900&display=swap" rel="stylesheet">
+    <style>
+        :root {
             --bg-color: #0c1222;
             --panel-bg: #111827;
             --border-color: #1f2937;