diff --git a/assets/app.js b/assets/app.js
index 6acb325..4e1e497 100644
--- a/assets/app.js
+++ b/assets/app.js
@@ -236,13 +236,14 @@
   }
 
   // 各面板计数文字按所选班级过滤（成绩明细 / 缺考名单）
+  // 缺考数与统计卡片保持一致：过滤后名单 − 过滤后提交（而非二次过滤后端 absent 数组）
   function renderHints() {
     const cls = $('#clsSel').value;
     const rowsForCls = cls ? state.rows.filter(r => (r.cls || '') === cls) : state.rows;
     const rosterForCls = cls ? (state.roster || []).filter(s => (s.cls || '') === cls) : (state.roster || []);
-    const absentForCls = cls ? state.absent.filter(a => (a.cls || '') === cls) : state.absent;
+    const absentForCls = Math.max(0, rosterForCls.length - rowsForCls.length);
     $('#tableHint').textContent = '共 ' + rowsForCls.length + ' 人已提交 · 名单 ' + rosterForCls.length + ' 人';
-    $('#absentHint').textContent = absentForCls.length ? '共 ' + absentForCls.length + ' 人' : '';
+    $('#absentHint').textContent = absentForCls ? '共 ' + absentForCls + ' 人' : '';
   }
 
   function fmtDur(sec) {
@@ -317,7 +318,11 @@
 
   function renderAbsent() {
     const clsFilter = $('#clsSel').value;
-    const list = clsFilter ? state.absent.filter(a => (a.cls || '') === clsFilter) : state.absent;
+    // 与统计卡片保持一致：缺考 = 过滤后名单中未出现在提交记录里的学生（按 sid 匹配）
+    const rowsForCls = clsFilter ? state.rows.filter(r => (r.cls || '') === clsFilter) : state.rows;
+    const submittedSids = new Set(rowsForCls.map(r => r.sid).filter(Boolean));
+    const rosterForCls = clsFilter ? (state.roster || []).filter(s => (s.cls || '') === clsFilter) : (state.roster || []);
+    const list = rosterForCls.filter(s => !submittedSids.has(s.sid));
     const tb = $('#absentBody');
     if (!list.length) {
       tb.innerHTML = '<tr><td colspan="3" class="empty">' + (clsFilter ? '本班全部已提交 🎉' : '全部已提交 🎉') + '</td></tr>';
diff --git a/assets/style.css b/assets/style.css
index 1364cf3..101c11f 100644
--- a/assets/style.css
+++ b/assets/style.css
@@ -85,6 +85,22 @@ html, body {
 }
 .btn:hover { border-color: #c9d2e3; background: #fafbfe; }
 .btn:active { transform: translateY(1px); }
+.btn:disabled,
+.btn[disabled] {
+  opacity: .5;
+  cursor: not-allowed;
+  background: #eef1f6;
+  color: #a0aab8;
+  border-color: #d5dde8;
+  transform: none;
+  pointer-events: auto;
+}
+.btn-primary:disabled,
+.btn-primary[disabled] {
+  background: #b0c0d8;
+  border-color: #b0c0d8;
+  color: #fff;
+}
 .btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
 .btn-primary:hover { background: #2559db; border-color: #2559db; }
 .btn.sm { padding: 5px 10px; font-size: 12px; }
diff --git a/index.php b/index.php
index 4117fc4..2ebc865 100644
--- a/index.php
+++ b/index.php
@@ -38,7 +38,7 @@ $rosterCount = Roster::count();
       <span class="logo">NY</span>
       <div class="brand-text">
         <strong>NY问卷考试系统数据平台</strong>
-        <small>卷王问卷系统 · 实时数据统计</small>
+        <small>实时数据统计</small>
       </div>
     </div>
     <p class="login-tip">请输入卷王系统连接信息，完成连接测试后登录。密码需每次输入，避免依赖一次配置直接查看数据。</p>