Address code review feedback: improve accessibility and performance

Co-authored-by: JusterZhu <11714536+JusterZhu@users.noreply.github.com>

Author: Copilot

website/src/css/custom.css

@@ -86,7 +86,14 @@
   box-shadow: 6px 6px 0 rgba(93, 173, 226, 0.3);
 }
 
-/* Smooth transitions */
-* {
+/* Smooth transitions for theme components */
+.cosmicHero,
+.cosmicHero *,
+.featuresSection,
+.featuresSection *,
+.techSection,
+.techSection *,
+.navbar,
+.footer {
   transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
 }

website/src/pages/index.js

@@ -20,7 +20,7 @@ function CosmicHero() {
         <Heading as="h1" className={styles.cosmicTitle}>
           {siteConfig.title}
         </Heading>
-        <p className={styles.cosmicSubtitle}>
+        <p className={styles.cosmicSubtitle} aria-label="跨平台自动更新框架 极简 高效 开源">
           🚀 跨平台自动更新框架 · 极简 · 高效 · 开源
         </p>
         <div className={styles.actionButtons}>