diff --git a/index.html b/index.html
index 473b6af..d7bdd8d 100644
--- a/index.html
+++ b/index.html
@@ -104,18 +104,7 @@
     <div class="card">
       <h2>3.1 客户分类日报</h2>
       <div class="sub-note">DoD=T-1−T-2，DoD%=T-1/T-2−1。波动原因可编辑（暂存本浏览器）。</div>
-      <div class="scroll"><table id="tCustDaily"><thead><tr>
-        <th class="txt cd-sort" data-k="cat" data-ty="str">客户分类<span class="arw"></span></th>
-        <th class="cd-sort" data-k="idsp" data-ty="num">iDSP个数<span class="arw"></span></th>
-        <th class="cd-sort" data-k="base" data-ty="num">base daily revenue<span class="arw"></span></th>
-        <th class="cd-sort" data-k="t4" data-ty="num">T-4收入<span class="arw"></span></th>
-        <th class="cd-sort" data-k="t3" data-ty="num">T-3收入<span class="arw"></span></th>
-        <th class="cd-sort" data-k="t2" data-ty="num">T-2收入<span class="arw"></span></th>
-        <th class="cd-sort" data-k="t1" data-ty="num">T-1收入<span class="arw"></span></th>
-        <th class="cd-sort" data-k="dod" data-ty="num">DoD<span class="arw"></span></th>
-        <th class="cd-sort" data-k="dodp" data-ty="num">DoD%<span class="arw"></span></th>
-        <th class="txt">波动原因</th>
-      </tr></thead><tbody></tbody></table></div>
+      <div class="scroll"><table id="tCustDaily"><thead></thead><tbody></tbody></table></div>
     </div>
     <div class="card">
       <h2>3.2 客户明细 <span class="tag">保留14天</span></h2>
@@ -358,6 +347,20 @@ function renderCustDaily(){
       return (va<vb?-1:va>vb?1:0)*dir;
     });
   }
+  // 动态表头：用实际日期替代 T-4~T-1
+  function dLbl(dt){ return dt? dt : '—'; }
+  var thead=document.querySelector('#tCustDaily thead');
+  thead.innerHTML='<tr>'
+    +'<th class="txt cd-sort" data-k="cat" data-ty="str">客户分类<span class="arw"></span></th>'
+    +'<th class="cd-sort" data-k="idsp" data-ty="num">iDSP个数<span class="arw"></span></th>'
+    +'<th class="cd-sort" data-k="base" data-ty="num">base daily revenue<span class="arw"></span></th>'
+    +'<th class="cd-sort" data-k="t4" data-ty="num">'+dLbl(t4)+'<span class="arw"></span></th>'
+    +'<th class="cd-sort" data-k="t3" data-ty="num">'+dLbl(t3)+'<span class="arw"></span></th>'
+    +'<th class="cd-sort" data-k="t2" data-ty="num">'+dLbl(t2)+'<span class="arw"></span></th>'
+    +'<th class="cd-sort" data-k="t1" data-ty="num">'+dLbl(t1)+'<span class="arw"></span></th>'
+    +'<th class="cd-sort" data-k="dod" data-ty="num">DoD('+dLbl(t1)+'−'+dLbl(t2)+')<span class="arw"></span></th>'
+    +'<th class="cd-sort" data-k="dodp" data-ty="num">DoD%<span class="arw"></span></th>'
+    +'<th class="txt">波动原因</th></tr>';
   var body=rows.map(function(r){
     var dc=r.dod==null?'':(r.dod>=0?'pos':'neg');
     return '<tr><td class="txt">'+r.cat+'</td><td>'+(r.idsp||'')+'</td><td>'+n2(r.base)+'</td>'
@@ -368,7 +371,14 @@ function renderCustDaily(){
       +reasonCell('cust_daily', r.cat)+'</tr>';
   }).join('');
   document.querySelector('#tCustDaily tbody').innerHTML=body;
+  // 表头动态生成后重新绑定排序点击 + 箭头
   document.querySelectorAll('#tCustDaily th.cd-sort').forEach(function(th){
+    th.style.cursor='pointer';
+    th.onclick=function(){
+      var k=th.getAttribute('data-k'), ty=th.getAttribute('data-ty');
+      if(CD_SORT.k===k){ CD_SORT.dir=(CD_SORT.dir==='asc'?'desc':'asc'); } else { CD_SORT.k=k; CD_SORT.ty=ty; CD_SORT.dir='desc'; }
+      renderCustDaily();
+    };
     th.classList.remove('asc','desc');
     if(th.getAttribute('data-k')===CD_SORT.k) th.classList.add(CD_SORT.dir);
   });
@@ -416,14 +426,7 @@ function renderCustDetail(){
 
 // 3.1/3.2 表头排序绑定
 function bindCustSort(){
-  document.querySelectorAll('#tCustDaily th.cd-sort').forEach(function(th){
-    th.style.cursor='pointer';
-    th.onclick=function(){
-      var k=th.getAttribute('data-k'), ty=th.getAttribute('data-ty');
-      if(CD_SORT.k===k){ CD_SORT.dir=(CD_SORT.dir==='asc'?'desc':'asc'); } else { CD_SORT.k=k; CD_SORT.ty=ty; CD_SORT.dir='desc'; }
-      renderCustDaily();
-    };
-  });
+  // 3.1 的表头排序绑定在 renderCustDaily 内部动态处理（表头是动态生成的）
   document.querySelectorAll('#tCustDetail th.de-sort').forEach(function(th){
     th.style.cursor='pointer';
     th.onclick=function(){