Tweak stylesheet

Author: 1024jp

css/common.css

@@ -6,7 +6,7 @@
    author  : 1024jp <wolfrosch.com>
    site    : coteditor.com
    target  : all pages
-   lastMod : 2025-09
+   lastMod : 2025-12
   ////////////////////////////////////// */
 
 /*___0.universal_reset_______________________________________________________*/
@@ -18,14 +18,15 @@
 	font-weight: inherit;
 	font-style: inherit;
 	font-size-adjust: from-font;
+	text-rendering: optimizeLegibility;
 	text-autospace: normal;
 	text-spacing-trim: trim-start;
 }
 img {
 	border: none;
 }
 a {
-	text-decoration: none;
+	text-decoration-line: unset;
 	transition: -webkit-filter 0.3s;
 }
 ul li {
@@ -133,7 +134,7 @@ dfn {
 
 /* body */
 body {
-	font: 15px 'Helvetica Neue', sans-serif;
+	font: 15px -apple-system, 'Helvetica Neue', sans-serif;
 	letter-spacing: 0.01em;
 	color: hsl(0,0%,10%);
 

css/releasenotes.css

@@ -57,7 +57,7 @@ p.important {
 }
 
 article {
-	font-size: 13px;
+	font-size: 14px;
 }
 
 article+section,