fix: enhance ArticleCard component to conditionally hide expand button and fade effect based on content height

src/components/ArticleCard.astro

@@ -51,12 +51,25 @@ const hasContent = Astro.slots.has('default');
       if (!card) return;
 
       const content = card.querySelector('[data-content]') as HTMLElement;
+      const contentInner = content?.querySelector('.content-inner') as HTMLElement;
       const fade = card.querySelector('[data-fade]') as HTMLElement;
       const btn = card.querySelector('[data-expand-btn]') as HTMLButtonElement;
       const text = btn?.querySelector('[data-expand-text]');
       const icon = btn?.querySelector('[data-expand-icon]') as SVGElement;
 
-      if (!content || !btn || !text || !icon) return;
+      if (!content || !contentInner || !btn || !text || !icon) return;
+
+      // 检查内容实际高度是否超过最大高度
+      const maxHeight = 800;
+      const actualHeight = contentInner.scrollHeight;
+      
+      // 如果内容不超过最大高度，隐藏展开按钮和渐变效果
+      if (actualHeight <= maxHeight) {
+        content.style.maxHeight = 'none';
+        if (fade) fade.style.display = 'none';
+        btn.style.display = 'none';
+        return;
+      }
 
       let isExpanded = false;