diff --git a/抖音主题/报告/ai-usage-levels-for-software-company.html b/抖音主题/报告/ai-usage-levels-for-software-company.html
index dc02844..cc93dc5 100644
--- a/抖音主题/报告/ai-usage-levels-for-software-company.html
+++ b/抖音主题/报告/ai-usage-levels-for-software-company.html
@@ -19,7 +19,7 @@
             --sidebar-w: 260px; --header-h: 64px;
         }
         *{margin:0;padding:0;box-sizing:border-box;}
-        body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text-primary);line-height:1.6;font-size:14px;}
+        body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;background:var(--bg);color:var(--text-primary);line-height:1.57;font-size:14px;}
         ::-webkit-scrollbar{width:6px;height:6px;}
         ::-webkit-scrollbar-track{background:transparent;}
         ::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px;}
@@ -35,7 +35,7 @@
         .drawer-overlay.show{display:block;opacity:1;}
 
         .sidebar{position:fixed;top:var(--header-h);left:0;bottom:0;width:var(--sidebar-w);background:var(--bg-container);border-right:1px solid var(--border);overflow-y:auto;padding:1.25rem 0;z-index:90;}
-        .sidebar .toc-label{font-size:12px;text-transform:uppercase;color:var(--text-tertiary);padding:0 1.25rem;margin-bottom:0.75rem;}
+        .sidebar .toc-label{font-size:12px;text-transform:uppercase;letter-spacing:0.1em;color:var(--text-tertiary);padding:0 1.25rem;margin-bottom:0.75rem;}
         .sidebar nav ol{list-style:none;padding:0;counter-reset:toc;}
         .sidebar nav li{counter-increment:toc;padding:0;}
         .sidebar nav a{display:block;padding:0.5rem 1.25rem;color:var(--text-secondary);text-decoration:none;font-size:13px;line-height:1.4;border-left:2px solid transparent;transition:all .15s;}
@@ -135,6 +135,7 @@
 
 <nav class="sidebar" id="sidebar">
     <div class="toc-label">目录导航</div>
+    <nav>
     <ol>
         <li><a href="#s0">四级模型总览</a></li>
         <li><a href="#s1">Level 1 · AI 辅助</a></li>
@@ -146,6 +147,7 @@
         <li><a href="#s6">跨角色协作演变</a></li>
         <li><a href="#s7">落地建议</a></li>
     </ol>
+    </nav>
 </nav>
 
 <div class="main">