diff --git a/_site/heti.css b/_site/heti.css
index 83be8eb..09aced6 100644
--- a/_site/heti.css
+++ b/_site/heti.css
@@ -35,7 +35,7 @@
 @font-face {
   font-family: "Heti Song";
   font-weight: 200;
-  src: local("Songti SC Light"), local("Songti TC Light"), local(STSong), local("SimSun");
+  src: local("Songti SC Light"), local("Songti TC Light"), local("STSong"), local("SimSun");
 }
 
 @font-face {
@@ -173,7 +173,7 @@
   padding-inline-start: 16px;
   padding-inline-end: 16px;
   overflow: auto;
-  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "SFMono-Regular", consolas, "Liberation Mono", menlo, courier, monospace, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
   white-space: pre;
   word-wrap: normal;
   border-radius: 4px;
@@ -389,7 +389,7 @@
 .heti code {
   margin-inline-start: 0.25em;
   margin-inline-end: 0.25em;
-  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "SFMono-Regular", consolas, "Liberation Mono", menlo, courier, monospace, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
   font-size: 0.875em;
 }
 
@@ -472,7 +472,7 @@
   margin-inline-start: 0.25em;
   margin-inline-end: 0.25em;
   font-size: 0.75em;
-  font-family: "Helvetica Neue", Helvetica, Arial, "Heti Hei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Helvetica Neue", helvetica, arial, "Heti Hei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
   font-style: normal;
   line-height: 1;
   vertical-align: baseline;
@@ -561,15 +561,15 @@
 }
 
 .heti, .heti--sans {
-  font-family: "Helvetica Neue", Helvetica, Arial, "Heti Hei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Helvetica Neue", helvetica, arial, "Heti Hei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 }
 
 .heti--serif {
-  font-family: "Times New Roman", Times, "Heti Song", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Times New Roman", times, "Heti Song", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 }
 
 .heti--classic {
-  font-family: "Times New Roman", Times, "Heti Song", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Times New Roman", times, "Heti Song", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 }
 
 .heti--classic h1,
@@ -578,33 +578,32 @@
 .heti--classic h4,
 .heti--classic h5,
 .heti--classic h6 {
-  font-family: "Times New Roman", Times, "Heti Kai Black", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Times New Roman", times, "Heti Kai Black", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
   font-weight: 800;
 }
 
 .heti--classic blockquote,
 .heti--classic cite,
 .heti--classic q {
-  font-family: "Times New Roman", Times, "Heti Kai", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Times New Roman", times, "Heti Kai", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 }
 
-.heti--classic em,
 .heti--classic figcaption,
 .heti--classic caption,
 .heti--classic th {
-  font-family: "Helvetica Neue", Helvetica, Arial, "Heti Hei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Helvetica Neue", helvetica, arial, "Heti Hei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 }
 
 .heti--hei {
-  font-family: "Helvetica Neue", Helvetica, Arial, "Heti Hei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Helvetica Neue", helvetica, arial, "Heti Hei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 }
 
 .heti--song {
-  font-family: "Times New Roman", Times, "Heti Song", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Times New Roman", times, "Heti Song", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 }
 
 .heti--kai {
-  font-family: "Times New Roman", Times, "Heti Kai", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Times New Roman", times, "Heti Kai", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 }
 
 .heti--columns-1, .heti--columns-2, .heti--columns-3, .heti--columns-4, .heti--columns-16em, .heti--columns-20em, .heti--columns-24em, .heti--columns-28em, .heti--columns-32em, .heti--columns-36em, .heti--columns-40em, .heti--columns-44em, .heti--columns-48em, .heti comma {
@@ -687,7 +686,7 @@
 }
 
 .heti--ancient, .heti--poetry {
-  font-family: "Times New Roman", Times, "Heti Song", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Times New Roman", times, "Heti Song", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
 }
 
 .heti--ancient h1,
@@ -701,7 +700,7 @@
 .heti--poetry h4,
 .heti--poetry h5,
 .heti--poetry h6 {
-  font-family: "Times New Roman", Times, "Heti Kai Black", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Times New Roman", times, "Heti Kai Black", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
   font-weight: 800;
   text-align: center;
 }
@@ -838,7 +837,7 @@
   border-block-start: 1px solid;
   border-block-start-color: #cccccc;
   font-size: 14px;
-  font-family: "Helvetica Neue", Helvetica, Arial, "Heti Hei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Helvetica Neue", helvetica, arial, "Heti Hei", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
   line-height: 24px;
 }
 
diff --git a/lib/_variables.scss b/lib/_variables.scss
index fc568df..fcce073 100644
--- a/lib/_variables.scss
+++ b/lib/_variables.scss
@@ -9,9 +9,9 @@ $manualmode-dark-selector: '[data-darkmode="dark"] &' !default;
 
 // 字体 Fonts
 // 字体栈 Font Stacks
-$_font-stack-sans: "Helvetica Neue", Helvetica, Arial !default;
-$_font-stack-serif: "Times New Roman", Times !default;
-$_font-stack-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier !default;
+$_font-stack-sans: "Helvetica Neue", helvetica, arial !default;
+$_font-stack-serif: "Times New Roman", times !default;
+$_font-stack-mono: "SFMono-Regular", consolas, "Liberation Mono", menlo, courier !default;
 $_font-stack-symbol: "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol" !default;
 
 // 字体族 Font Families
diff --git a/lib/fonts/_song.scss b/lib/fonts/_song.scss
index b5b8f3b..5276737 100644
--- a/lib/fonts/_song.scss
+++ b/lib/fonts/_song.scss
@@ -17,7 +17,7 @@
   src:
     local("Songti SC Light"),
     local("Songti TC Light"),
-    local(STSong),
+    local("STSong"),
     local("SimSun");
 }
 
diff --git a/lib/modifiers/font-stack.scss b/lib/modifiers/font-stack.scss
index c6d3936..5a47483 100644
--- a/lib/modifiers/font-stack.scss
+++ b/lib/modifiers/font-stack.scss
@@ -16,6 +16,8 @@
   }
 
   // 定义传统字体
+  // 「传统字体」仅供设计参考。主旨为标题用楷体，正文用宋体，表头等客观指标描述场合用黑体。
+  // 由于渲染机制等原因，应尽量避免衬线、非衬线字体混排，会引起行高不一致的bug。
   &--classic {
     // 正文使用宋体
     font-family: $font-family-song;
@@ -38,8 +40,7 @@
       font-family: $font-family-kai;
     }
 
-    // 强调、说明文字、表头使用黑体
-    em,
+    // 说明文字、表头等反应客观指标、事物的位置使用黑体
     figcaption,
     caption,
     th {