diff --git a/api.php b/api.php
index 1f7b13f..3010add 100644
--- a/api.php
+++ b/api.php
@@ -89,11 +89,12 @@ try {
                     continue;
                 }
                 $out[] = [
-                    'id'    => ny_str($p['id'] ?? ''),
-                    'name'  => ny_str($p['name'] ?? '') ?: '未命名',
-                    'mode'  => ny_str($p['mode'] ?? ''),
-                    'total' => (int)($p['total'] ?? 0),
-                    'status'=> (int)($p['status'] ?? 0),
+                    'id'        => ny_str($p['id'] ?? ''),
+                    'name'      => ny_str($p['name'] ?? '') ?: '未命名',
+                    'mode'      => ny_str($p['mode'] ?? ''),
+                    'total'     => (int)($p['total'] ?? 0),
+                    'status'    => (int)($p['status'] ?? 0),
+                    'parent_id' => (string)($p['parentId'] ?? '0'),
                 ];
             }
             ny_ok($out);
diff --git a/assets/app.js b/assets/app.js
index d194a15..db0078d 100644
--- a/assets/app.js
+++ b/assets/app.js
@@ -87,16 +87,37 @@
         const ph = document.createElement('option');
         ph.value = ''; ph.textContent = '请选择问卷 / 考试';
         sel.appendChild(ph);
-        state.projects.forEach(p => {
+
+        // 文件夹（mode 含 folder）以 optgroup 分组形式呈现，其子项以 parentId 关联
+        const isFolder = p => (p.mode || '').toLowerCase().includes('folder');
+        const folders = state.projects.filter(isFolder);
+        const folderIds = new Set(folders.map(f => f.id));
+        const childOfFolder = fid => state.projects.filter(p => !isFolder(p) && (p.parent_id || '0') === fid);
+
+        const mkOpt = p => {
           const o = document.createElement('option');
           o.value = p.id;
           o.textContent = (p.mode ? '[' + p.mode + '] ' : '') + p.name + '（' + (p.total || 0) + '份）';
-          sel.appendChild(o);
+          return o;
+        };
+
+        // 根项（不含文件夹、且 parent_id 不指向任何文件夹）
+        state.projects.filter(p => !isFolder(p) && !(p.parent_id && p.parent_id !== '0' && folderIds.has(p.parent_id)))
+          .forEach(p => sel.appendChild(mkOpt(p)));
+        // 文件夹及子项
+        folders.forEach(f => {
+          const kids = childOfFolder(f.id);
+          if (!kids.length) return; // 空文件夹不显示
+          const og = document.createElement('optgroup');
+          og.label = '📁 ' + f.name;
+          kids.forEach(p => og.appendChild(mkOpt(p)));
+          sel.appendChild(og);
         });
       }
       if (keep && state.projects.some(p => p.id === keep)) sel.value = keep;
       else if (state.deeplinkProject && state.projects.some(p => p.id === state.deeplinkProject)) sel.value = state.deeplinkProject;
-      setConn('conn-on', '已连接 · ' + state.projects.length + ' 个问卷');
+      const surveyCount = state.projects.filter(p => !(p.mode || '').toLowerCase().includes('folder')).length;
+      setConn('conn-on', '已连接 · ' + surveyCount + ' 个问卷');
       showAlert('');
       if (sel.value) refresh();
     } catch (e) {
@@ -132,6 +153,7 @@
       renderTable();
       state.prevSids = cur;
       populateClasses();
+      populateGroups();
       renderAbsent();
       renderUnmatched();
       renderHints();
@@ -184,11 +206,33 @@
     else sel.value = '';
   }
 
-  // 按当前所选班级（或无）客户端重算统计卡片
-  function computeDisplayStats(cls) {
+  // 组别下拉：仅显示当前所选班级内出现的组别（"全部班级" 时显示所有组别）
+  function populateGroups() {
+    const cls = $('#clsSel').value;
+    const grpSel = $('#grpSel');
+    if (!grpSel) return;
+    const cur = grpSel.value;
+    const set = new Set();
+    (state.roster || []).forEach(s => {
+      if (cls && (s.cls || '') !== cls) return;
+      if (s.grp) set.add(s.grp);
+    });
+    const vals = Array.from(set).sort();
+    grpSel.innerHTML = '<option value="">全部组别</option>' +
+      vals.map(v => '<option value="' + esc(v) + '">' + esc(v) + '</option>').join('');
+    if (vals.indexOf(cur) >= 0) grpSel.value = cur;
+    else grpSel.value = '';
+  }
+
+  // 按当前所选班级 + 组别（或无）客户端重算统计卡片
+  function computeDisplayStats(cls, grp) {
     const allStudents = state.roster || [];
-    const rows = cls ? state.rows.filter(r => (r.cls || '') === cls) : state.rows;
-    const students = cls ? allStudents.filter(s => (s.cls || '') === cls) : allStudents;
+    let students = cls ? allStudents.filter(s => (s.cls || '') === cls) : allStudents;
+    let rows     = cls ? state.rows.filter(r => (r.cls || '') === cls) : state.rows;
+    if (grp) {
+      students = students.filter(s => (s.grp || '') === grp);
+      rows     = rows.filter(r => (r.grp || '') === grp);
+    }
     const total = students.length;
     const submitted = rows.length;
     const absent = Math.max(0, total - submitted);
@@ -222,7 +266,8 @@
 
   function renderStats() {
     const cls = $('#clsSel').value;
-    const st = computeDisplayStats(cls);
+    const grp = $('#grpSel').value;
+    const st = computeDisplayStats(cls, grp);
     const set = (id, v) => { $(id).textContent = v; };
     set('#sTotal', st.total);
     set('#sSubmit', st.submitted);
@@ -235,15 +280,18 @@
     set('#sDur', st.avgDur == null ? '-' : fmtDur(st.avgDur));
   }
 
-  // 各面板计数文字按所选班级过滤（成绩明细 / 缺考名单）
+  // 各面板计数文字按所选班级 + 组别过滤（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 grp = $('#grpSel').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 = Math.max(0, rosterForCls.length - rowsForCls.length);
-    $('#tableHint').textContent = '共 ' + rowsForCls.length + ' 人已提交 · 名单 ' + rosterForCls.length + ' 人';
-    $('#absentHint').textContent = absentForCls ? '共 ' + absentForCls + ' 人' : '';
+    const rowsForGrp = grp ? rowsForCls.filter(r => (r.grp || '') === grp) : rowsForCls;
+    const rosterForGrp = grp ? rosterForCls.filter(s => (s.grp || '') === grp) : rosterForCls;
+    const absentForGrp = Math.max(0, rosterForGrp.length - rowsForGrp.length);
+    $('#tableHint').textContent = '共 ' + rowsForGrp.length + ' 人已提交 · 名单 ' + rosterForGrp.length + ' 人';
+    $('#absentHint').textContent = absentForGrp ? '共 ' + absentForGrp + ' 人' : '';
   }
 
   function fmtDur(sec) {
@@ -265,9 +313,11 @@
   function renderTable() {
     const kw = $('#kw').value.trim().toLowerCase();
     const clsFilter = $('#clsSel').value;
+    const grpFilter = $('#grpSel').value;
     let rows = state.rows.slice();
 
     if (clsFilter) rows = rows.filter(r => (r.cls || '') === clsFilter);
+    if (grpFilter) rows = rows.filter(r => (r.grp || '') === grpFilter);
     if (kw) rows = rows.filter(r =>
       String(r.sid).toLowerCase().includes(kw) || String(r.name).toLowerCase().includes(kw));
 
@@ -319,11 +369,14 @@
 
   function renderAbsent() {
     const clsFilter = $('#clsSel').value;
+    const grpFilter = $('#grpSel').value;
     // 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 rowsForGrp = grpFilter ? rowsForCls.filter(r => (r.grp || '') === grpFilter) : rowsForCls;
+    const submittedSids = new Set(rowsForGrp.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 rosterForGrp = grpFilter ? rosterForCls.filter(s => (s.grp || '') === grpFilter) : rosterForCls;
+    const list = rosterForGrp.filter(s => !submittedSids.has(s.sid));
     const tb = $('#absentBody');
     if (!list.length) {
       tb.innerHTML = '<tr><td colspan="4" class="empty">' + (clsFilter ? '本班全部已提交 🎉' : '全部已提交 🎉') + '</td></tr>';
@@ -505,6 +558,13 @@
     }
     $('#kw').addEventListener('input', renderTable);
     $('#clsSel').addEventListener('change', () => {
+      populateGroups();
+      renderStats();
+      renderTable();
+      renderAbsent();
+      renderHints();
+    });
+    $('#grpSel').addEventListener('change', () => {
       renderStats();
       renderTable();
       renderAbsent();
diff --git a/assets/style.css b/assets/style.css
index 65d8cf9..9e7b96d 100644
--- a/assets/style.css
+++ b/assets/style.css
@@ -526,10 +526,21 @@ body.fs-on .topbar { padding-top: 8px; padding-bottom: 8px; }
 .gpanel, .class-card { overflow: hidden; }
 .member-list td.name { max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 
-/* 看板全屏适配 */
-body.fs-on .wrap { max-width: none; padding-top: 14px; }
-body.fs-on .member-list { max-height: 46vh; }
-body.fs-on .class-grid { grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); }
-body.fs-on .group-compare { grid-template-columns: 1fr 1fr; }
-body.fs-on .dash-hero { border-radius: var(--radius); }
+/* 看板全屏：整页不溢出屏幕（外层锁 100vh + overflow:hidden，内部区域自行滚动） */
+body.dash.fs-on .wrap {
+  height: 100vh; display: flex; flex-direction: column; overflow: hidden;
+  max-width: none; padding: 12px 20px 14px;
+}
+body.dash.fs-on .dash-hero { padding: 12px 18px; flex: 0 0 auto; border-radius: var(--radius); }
+body.dash.fs-on .sec-title { margin: 12px 0 4px; font-size: 14px; }
+body.dash.fs-on .cards { gap: 10px; margin-top: 10px; }
+body.dash.fs-on .card { padding: 10px 12px; }
+body.dash.fs-on .card b { font-size: 20px; }
+body.dash.fs-on #overview, body.dash.fs-on #detail {
+  flex: 1 1 auto; min-height: 0; overflow: auto;
+}
+body.dash.fs-on .class-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
+body.dash.fs-on .group-compare { gap: 12px; }
+body.dash.fs-on .gpanel { padding: 12px 14px; }
+body.dash.fs-on .member-list { max-height: 30vh; }
 
diff --git a/dashboard.php b/dashboard.php
index c56f0c4..0cfb7a9 100644
--- a/dashboard.php
+++ b/dashboard.php
@@ -10,7 +10,7 @@ require __DIR__ . '/bootstrap.php';
 <title>数据看板 · <?= htmlspecialchars(NY_APP_NAME) ?></title>
 <link rel="stylesheet" href="assets/style.css">
 </head>
-<body>
+<body class="dash">
 
 <div class="wrap">
 
diff --git a/index.php b/index.php
index 7290a87..1ee3fbc 100644
--- a/index.php
+++ b/index.php
@@ -71,6 +71,10 @@ $rosterCount = Roster::count();
       <label>班级</label>
       <select id="clsSel"><option value="">全部班级</option></select>
     </div>
+    <div class="field">
+      <label>组别</label>
+      <select id="grpSel"><option value="">全部组别</option></select>
+    </div>
     <div class="field">
       <label>自动刷新</label>
       <div class="inline">