style: 调整文章内容标题的字号和字重

src/app.css

@@ -571,17 +571,19 @@ body.single-col .post-list {
 }
 
 .article-content h1 {
-	font-size: 1.4em;
+	font-size: 1.3em;
+	font-weight: 600;
 	margin: 1.1em 0 0.36em;
 }
 
 .article-content > h1 {
 	margin-top: 0;
-	font-size: 1.4em;
+	font-size: 1.3em;
 }
 
 .article-content h2 {
-	font-size: 1.3em;
+	font-size: 1.2em;
+	font-weight: 600;
 	margin: 1.005em 0 0.375em;
 	padding-left: 14px;
 	border-left: 5px solid var(--accent-color);
@@ -592,7 +594,8 @@ body.single-col .post-list {
 }
 
 .article-content h3 {
-	font-size: 1.1em;
+	font-size: 1.05em;
+	font-weight: 600;
 	margin: 1em 0 0.2925em;
 	display: flex;
 	align-items: center;
@@ -602,8 +605,8 @@ body.single-col .post-list {
 	content: '#';
 	color: var(--accent-color);
 	margin-right: 8px;
-	font-weight: bold;
-	font-size: 1.1em;
+	font-weight: 600;
+	font-size: 1.05em;
 }
 
 .article-content h4 {