style: 调整卡片标题字号与封面图片高度以优化视觉布局

src/app.css

@@ -355,7 +355,7 @@ body.single-col .post-list {
 }
 
 .card .title {
-	font-size: 1.71rem;
+	font-size: 1.4rem;
 	font-weight: bold;
 	margin: 0 0 0.6rem 0;
 	color: var(--text-color);
@@ -1391,7 +1391,7 @@ footer section p:first-child {
 /* Featured Image Styles */
 .post-cover {
 	width: 100%;
-	height: 300px;
+	height: 200px;
 	overflow: hidden;
 	border-bottom: none;
 }