fix(web): 知识正文按阅读字号排版，重写 Markdown 样式

- 正文从 14px 提到 16px / 1.85，不再比编辑器（0.9rem）还小
- 标题靠字重与留白分层，h2 加细分隔线；行内代码、代码块、引用、表格、图片统一重排
- 正文限宽 42rem 居中，长段落不用来回扫行
- 评论与工单说明走 prose-dadao--sm（14px），抽屉里不喧宾夺主

web/src/components/Markdown.tsx

@@ -27,11 +27,7 @@ export function Markdown({ source, compact = false, className = "", resources }:
 
   return (
     <div
-      className={[
-        "prose-dadao text-sm leading-6 text-ink-800",
-        compact ? "prose-compact" : "",
-        className,
-      ].join(" ")}
+      className={["prose-dadao", compact ? "prose-compact" : "", className].join(" ")}
       dangerouslySetInnerHTML={{ __html: html }}
     />
   );

web/src/components/TaskDetail.tsx

@@ -619,7 +619,11 @@ export function TaskDetail({
                     )}
                   </span>
                   <div className="min-w-0 flex-1 rounded-xl rounded-tl-sm bg-paper-100 px-3 py-2">
-                    <Markdown source={c.body_md} resources={resources} />
+                    <Markdown
+                      source={c.body_md}
+                      resources={resources}
+                      className="prose-dadao--sm"
+                    />
                     <p className="mt-0.5 text-2xs text-ink-400">
                       {new Date(c.created_at).toLocaleString("zh-CN")}
                     </p>

web/src/index.css

@@ -164,49 +164,98 @@
 }
 
 /* Markdown 渲染样式：不引 @tailwindcss/typography（它会把行距和字重改得不像我们的界面），
-   这里只针对我们真正会渲染的标签写一遍，保持与组件库同一套色板与节奏。 */
+   这里只针对我们真正会渲染的标签写一遍，保持与组件库同一套色板与节奏。
+   阅读区按 16px / 1.85 排：看的时候字号不该比编辑时（0.9rem）还小。 */
+.prose-dadao {
+  color: theme("colors.ink.800");
+  font-size: 1rem;
+  line-height: 1.85;
+  letter-spacing: 0.01em;
+  overflow-wrap: break-word;
+}
+.prose-dadao > :first-child {
+  margin-top: 0;
+}
 .prose-dadao > * + * {
-  margin-top: 0.6em;
+  margin-top: 0.85em;
+}
+.prose-dadao p {
+  margin: 0;
 }
 
+/* 抽屉里的短文本（评论、工单处理说明）不需要阅读区那么大的字号 */
+.prose-dadao--sm {
+  font-size: 0.875rem;
+  line-height: 1.7;
+}
+
+/* 标题分层靠字重与上方留白，不靠颜色 */
 .prose-dadao h1,
 .prose-dadao h2,
 .prose-dadao h3,
-.prose-dadao h4 {
+.prose-dadao h4,
+.prose-dadao h5,
+.prose-dadao h6 {
   font-family: theme("fontFamily.display");
   color: theme("colors.ink.900");
-  line-height: 1.35;
-  margin-top: 1.1em;
+  line-height: 1.4;
+  letter-spacing: 0;
+  scroll-margin-top: 4rem;
 }
 .prose-dadao h1 {
-  font-size: 1.25rem;
+  font-size: 1.55em;
+  font-weight: 700;
+  margin-top: 1.7em;
 }
 .prose-dadao h2 {
-  font-size: 1.1rem;
+  font-size: 1.28em;
+  font-weight: 600;
+  margin-top: 1.6em;
+  padding-bottom: 0.35em;
+  border-bottom: 1px solid theme("colors.line.100");
 }
-.prose-dadao h3,
-.prose-dadao h4 {
-  font-size: 1rem;
+.prose-dadao h3 {
+  font-size: 1.1em;
+  font-weight: 600;
+  margin-top: 1.35em;
+}
+.prose-dadao h4,
+.prose-dadao h5,
+.prose-dadao h6 {
+  font-size: 1em;
+  font-weight: 600;
+  margin-top: 1.2em;
+  color: theme("colors.ink.700");
 }
 
-.prose-dadao strong {
+.prose-dadao strong,
+.prose-dadao b {
   font-weight: 600;
   color: theme("colors.ink.900");
 }
+/* 中文里斜体不好认，强调改成"荧光笔"底纹 */
+.prose-dadao em {
+  font-style: normal;
+  background: linear-gradient(transparent 62%, theme("colors.primary.100") 0);
+  padding: 0 0.1em;
+}
 
 .prose-dadao a {
   color: theme("colors.primary.700");
   text-decoration: underline;
   text-decoration-color: theme("colors.primary.300");
-  text-underline-offset: 2px;
+  text-underline-offset: 0.22em;
 }
 .prose-dadao a:hover {
   color: theme("colors.primary.800");
+  text-decoration-color: theme("colors.primary.500");
+  background: theme("colors.primary.50");
+  border-radius: 3px;
 }
 
 .prose-dadao ul,
 .prose-dadao ol {
-  padding-left: 1.15rem;
+  padding-left: 1.4em;
 }
 .prose-dadao ul {
   list-style: disc;
@@ -215,50 +264,72 @@
   list-style: decimal;
 }
 .prose-dadao li::marker {
-  color: theme("colors.ink.300");
+  color: theme("colors.primary.400");
 }
 .prose-dadao li + li {
-  margin-top: 0.2em;
+  margin-top: 0.3em;
+}
+.prose-dadao li > ul,
+.prose-dadao li > ol {
+  margin-top: 0.3em;
+  padding-left: 1.2em;
+}
+.prose-dadao input[type="checkbox"] {
+  margin-right: 0.45em;
+  vertical-align: middle;
 }
 
 .prose-dadao blockquote {
-  border-left: 2px solid theme("colors.primary.300");
-  padding-left: 0.75rem;
-  color: theme("colors.ink.600");
+  margin: 1.1em 0;
+  padding: 0.75em 1em;
+  border-left: 3px solid theme("colors.primary.300");
+  border-radius: 0 10px 10px 0;
+  background: theme("colors.paper.100");
+  color: theme("colors.ink.700");
+}
+.prose-dadao blockquote > * + * {
+  margin-top: 0.5em;
+}
+.prose-dadao blockquote p {
+  margin: 0;
 }
 
 .prose-dadao code {
   font-family: theme("fontFamily.mono");
-  font-size: 0.86em;
+  font-size: 0.875em;
   background: theme("colors.paper.200");
-  border-radius: 4px;
-  padding: 0.1em 0.35em;
+  color: theme("colors.ink.900");
+  border-radius: 5px;
+  padding: 0.12em 0.4em;
 }
 
 .prose-dadao pre {
   background: theme("colors.ink.900");
   color: theme("colors.paper.50");
-  border-radius: 10px;
-  padding: 0.7rem 0.85rem;
+  border-radius: 12px;
+  padding: 0.9rem 1rem;
   overflow-x: auto;
-  font-size: 0.82em;
-  line-height: 1.6;
+  font-size: 0.86em;
+  line-height: 1.7;
 }
 .prose-dadao pre code {
   background: transparent;
   padding: 0;
   color: inherit;
+  font-size: inherit;
 }
 
 .prose-dadao hr {
   border: 0;
   border-top: 1px solid theme("colors.line.200");
+  margin: 2em 0;
 }
 
 .prose-dadao img {
   max-width: 100%;
-  border-radius: 8px;
+  border-radius: 10px;
   border: 1px solid theme("colors.line.100");
+  box-shadow: theme("boxShadow.card");
 }
 
 /* 表格：宽表横向滚动（不撑破抽屉），窄表铺满 */
@@ -268,29 +339,62 @@
   min-width: 100%;
   max-width: 100%;
   overflow-x: auto;
-  border-collapse: collapse;
-  font-size: 0.9em;
-  margin: 0.6rem 0;
+  border: 1px solid theme("colors.line.200");
+  border-collapse: separate;
+  border-spacing: 0;
+  border-radius: 10px;
+  font-size: 0.94em;
+  margin: 1.1em 0;
 }
 .prose-dadao th,
 .prose-dadao td {
-  border: 1px solid theme("colors.line.200");
-  padding: 0.4rem 0.6rem;
+  border-bottom: 1px solid theme("colors.line.100");
+  padding: 0.5em 0.8em;
   text-align: left;
   white-space: nowrap;
 }
-.prose-dadao th {
-  background: theme("colors.paper.200");
+.prose-dadao thead th {
+  background: theme("colors.paper.100");
+  border-bottom: 1px solid theme("colors.line.200");
   font-weight: 600;
-  color: theme("colors.ink.800");
+  color: theme("colors.ink.700");
 }
-.prose-dadao tbody tr:nth-child(even) td {
+.prose-dadao tbody tr:last-child td {
+  border-bottom: 0;
+}
+.prose-dadao tbody tr:hover td {
   background: theme("colors.paper.50");
 }
 
 .prose-compact {
-  font-size: 0.8rem;
-  line-height: 1.5;
+  font-size: 0.8125rem;
+  line-height: 1.7;
+  letter-spacing: 0;
+}
+.prose-compact > * + * {
+  margin-top: 0.55em;
+}
+.prose-compact h1 {
+  font-size: 1.2em;
+  margin-top: 1em;
+}
+.prose-compact h2 {
+  font-size: 1.08em;
+  margin-top: 1em;
+}
+.prose-compact h3,
+.prose-compact h4 {
+  font-size: 1em;
+  margin-top: 0.9em;
+}
+.prose-compact pre {
+  font-size: 0.82em;
+  padding: 0.6rem 0.75rem;
+  border-radius: 8px;
+}
+.prose-compact blockquote {
+  margin: 0.7em 0;
+  padding: 0.55em 0.8em;
 }
 
 /* ---- Vditor 富文本：只做"贴合本产品"的覆写，不改它的行为 ---- */

web/src/pages/Knowledge.tsx

@@ -1056,8 +1056,13 @@ function KnowledgeDrawer({
 
           {/* 看的时候就是渲染后的样子：标题、列表、表格、图片都按 Markdown 显示。
               要改再点「编辑」，进来才是编辑器——两者不该混在同一个界面里。 */}
-          <div className="rounded-xl border border-line-200 bg-white px-4 py-4">
-            <Markdown source={doc.body_md} resources={resources} />
+          <div className="rounded-xl border border-line-200 bg-white px-5 py-6 sm:px-8">
+            {/* 正文限宽到约 42 个字：整行拉满 1150px 时眼睛要来回扫，反而不好读 */}
+            <Markdown
+              source={doc.body_md}
+              resources={resources}
+              className="mx-auto w-full max-w-[42rem]"
+            />
           </div>
 
           {attachments.length > 0 && (