diff --git a/resources/desktop-picker.ps1 b/resources/desktop-picker.ps1
index 87a8b93..cafe81b 100644
--- a/resources/desktop-picker.ps1
+++ b/resources/desktop-picker.ps1
@@ -1,6 +1,6 @@
 param([string]$Mode = "element")
 $ErrorActionPreference = "Continue"
-Add-Type -AssemblyName UIAutomationClient, UIAutomationTypes
+Add-Type -AssemblyName UIAutomationClient, UIAutomationTypes, WindowsBase
 Add-Type -AssemblyName System.Windows.Forms
 Add-Type -MemberDefinition "[DllImport(`"user32.dll`")] public static extern short GetAsyncKeyState(int key); [DllImport(`"user32.dll`", CharSet = CharSet.Unicode)] public static extern int GetWindowTextW(IntPtr h, System.Text.StringBuilder sb, int max);" -Name PickW32 -Namespace RpaPick | Out-Null
 
@@ -15,79 +15,112 @@ if ($Mode -eq "windows") {
   exit 0
 }
 
-function Get-DeepestAtPoint([double]$px, [double]$py) {
-  $point = New-Object System.Windows.Automation.Point($px, $py)
-  $cur = [System.Windows.Automation.AutomationElement]::FromPoint($point)
-  if (-not $cur) { return $null }
-  for ($depth = 0; $depth -lt 30; $depth++) {
-    $children = $cur.FindAll([System.Windows.Automation.TreeScope]::Children, [System.Windows.Automation.Condition]::TrueCondition)
-    $next = $null
-    $nextArea = [double]::MaxValue
-    foreach ($c in $children) {
-      try {
-        $r = $c.Current.BoundingRectangle
-        if ($r.Width -gt 0 -and $r.Height -gt 0 -and $px -ge $r.X -and $px -le ($r.X + $r.Width) -and $py -ge $r.Y -and $py -le ($r.Y + $r.Height)) {
-          $area = $r.Width * $r.Height
-          if ($area -lt $nextArea) { $next = $c; $nextArea = $area }
-        }
-      } catch {}
-    }
-    if (-not $next) { break }
-    $cur = $next
-  }
-  return $cur
-}
-
+# ---- 信息窗 ----
 $form = New-Object System.Windows.Forms.Form
 $form.FormBorderStyle = [System.Windows.Forms.FormBorderStyle]::None
 $form.TopMost = $true
 $form.StartPosition = [System.Windows.Forms.FormStartPosition]::Manual
 $form.Location = New-Object System.Drawing.Point(20, 20)
-$form.Size = New-Object System.Drawing.Size(460, 130)
+$form.Size = New-Object System.Drawing.Size(480, 110)
 $form.BackColor = [System.Drawing.Color]::FromArgb(20, 60, 120)
 $label = New-Object System.Windows.Forms.Label
 $label.Dock = [System.Windows.Forms.DockStyle]::Fill
 $label.ForeColor = [System.Drawing.Color]::White
-$label.Font = New-Object System.Drawing.Font("Microsoft YaHei", 11)
-$label.Text = "移动鼠标选择元素..."
+$label.Font = New-Object System.Drawing.Font("Microsoft YaHei", 10)
 $form.Controls.Add($label)
-$form.Show()
 
-$prevDown = $false
-$result = $null
+# ---- 高亮窗（半透明红块） ----
+$hl = New-Object System.Windows.Forms.Form
+$hl.FormBorderStyle = [System.Windows.Forms.FormBorderStyle]::None
+$hl.TopMost = $true
+$hl.ShowInTaskbar = $false
+$hl.StartPosition = [System.Windows.Forms.FormStartPosition]::Manual
+$hl.BackColor = [System.Drawing.Color]::Red
+$hl.Opacity = 0.35
+
+# ---- 状态 ----
+$stage = "hover"
+$chain = New-Object System.Collections.ArrayList
+$selIdx = -1
+$prevPageUp = $false
+$prevPageDown = $false
+$prevSpace = $false
+
+function Show-Element($el) {
+  if ($null -eq $el) { $script:hl.Hide(); return }
+  $r = $el.Current.BoundingRectangle
+  if ($r.Width -le 0 -or $r.Height -le 0) { $script:hl.Hide(); return }
+  $script:hl.Location = New-Object System.Drawing.Point([int]($r.X - 2), [int]($r.Y - 2))
+  $script:hl.Size = New-Object System.Drawing.Size([int]($r.Width + 4), [int]($r.Height + 4))
+  $script:hl.Show()
+}
+
+$form.Show()
+$hl.Show()
+
 while ($true) {
-  $ptX = [System.Windows.Forms.Cursor]::Position.X
-  $ptY = [System.Windows.Forms.Cursor]::Position.Y
-  $el = Get-DeepestAtPoint $ptX $ptY
-  $down = ([RpaPick.PickW32]::GetAsyncKeyState(32) -band 0x8000) -ne 0
+  $space = ([RpaPick.PickW32]::GetAsyncKeyState(32) -band 0x8000) -ne 0
   $esc = ([RpaPick.PickW32]::GetAsyncKeyState(27) -band 0x8000) -ne 0
+  $pgUp = ([RpaPick.PickW32]::GetAsyncKeyState(33) -band 0x8000) -ne 0
+  $pgDn = ([RpaPick.PickW32]::GetAsyncKeyState(34) -band 0x8000) -ne 0
+
   if ($esc) { break }
-  if ($el) {
-    $c = $el.Current
-    $ctrlName = $c.ControlType.ProgrammaticName.Replace("ControlType.", "")
-    $label.Text = "名称: " + $c.Name + [Environment]::NewLine + "类型: " + $ctrlName + [Environment]::NewLine + "空格=拾取  Esc=取消"
-  }
-  if ($down -and $el) {
-    $c = $el.Current
-    $rootName = ""
-    $walker = [System.Windows.Automation.TreeWalker]::ControlViewWalker
-    $anc = $walker.GetParent($el)
-    while ($anc -and -not $anc.Equals([System.Windows.Automation.AutomationElement]::RootElement)) {
-      $h = $anc.Current.NativeWindowHandle
-      if ($h -ne 0) {
-        $sb = New-Object System.Text.StringBuilder 512
-        [RpaPick.PickW32]::GetWindowTextW([IntPtr]$h, $sb, 512) | Out-Null
-        if ($sb.ToString()) { $rootName = $sb.ToString(); break }
-      }
-      $anc = $walker.GetParent($anc)
+
+  if ($stage -eq "hover") {
+    $ptX = [System.Windows.Forms.Cursor]::Position.X
+    $ptY = [System.Windows.Forms.Cursor]::Position.Y
+    $point = New-Object System.Windows.Automation.Point($ptX, $ptY)
+    $el = $null
+    try { $el = [System.Windows.Automation.AutomationElement]::FromPoint($point) } catch {}
+    if ($el) {
+      $c = $el.Current
+      $ctrlName = $c.ControlType.ProgrammaticName.Replace("ControlType.", "")
+      $label.Text = "名称: " + $c.Name + [Environment]::NewLine + "类型: " + $ctrlName + [Environment]::NewLine + "空格=锁定  Esc=取消"
+      Show-Element $el
+    }
+    if ($space -and -not $prevSpace -and $el) {
+      # 进入微调：收集从根到命中的元素链
+      $walker = [System.Windows.Automation.TreeWalker]::ControlViewWalker
+      $chain.Clear()
+      $cur = $el
+      while ($cur -and -not $cur.Equals([System.Windows.Automation.AutomationElement]::RootElement)) {
+        $cc = $cur.Current
+        $rr = $cc.BoundingRectangle
+        [void]$chain.Insert(0, @{ el = $cur; name = [string]$cc.Name; automationId = [string]$cc.AutomationId; controlType = $cc.ControlType.ProgrammaticName.Replace("ControlType.", ""); x = [int]$rr.X; y = [int]$rr.Y; w = [int]$rr.Width; h = [int]$rr.Height })
+        $cur = $walker.GetParent($cur)
+      }
+      $selIdx = $chain.Count - 1
+      $stage = "adjust"
+      $label.Text = "微调模式：PageUp/PageDown 切换层级，空格确认，Esc 取消"
     }
-    $ctrlName = $c.ControlType.ProgrammaticName.Replace("ControlType.", "")
-    $result = @{ window = $rootName; name = $c.Name; automationId = $c.AutomationId; controlType = $ctrlName; className = $c.ClassName }
-    break
   }
-  $prevDown = $down
-  Start-Sleep -Milliseconds 80
+
+  if ($stage -eq "adjust") {
+    if ($pgUp -and -not $prevPageUp -and $selIdx -gt 0) { $selIdx -= 1 }
+    if ($pgDn -and -not $prevPageDown -and $selIdx -lt ($chain.Count - 1)) { $selIdx += 1 }
+    $item = $chain[$selIdx]
+    if ($item) {
+      $label.Text = "层级 " + ($selIdx + 1) + "/" + $chain.Count + "  名称: " + $item.name + [Environment]::NewLine + "类型: " + $item.controlType + [Environment]::NewLine + "PageUp/PageDown=切层级  空格=确认  Esc=取消"
+      $hl.Location = New-Object System.Drawing.Point($item.x - 2, $item.y - 2)
+      $hl.Size = New-Object System.Drawing.Size($item.w + 4, $item.h + 4)
+      $hl.Show()
+    }
+    if ($space -and -not $prevSpace) {
+      $item = $chain[$selIdx]
+      # 窗口名 = 链中第一个带窗口句柄的层
+      $rootName = ""
+      foreach ($it in $chain) { if ($it.name) { $rootName = $it.name; break } }
+      $result = @{ selected = $selIdx; window = $rootName; name = $item.name; automationId = $item.automationId; controlType = $item.controlType; x = $item.x; y = $item.y; w = $item.w; h = $item.h }
+      break
+    }
+  }
+
+  $prevPageUp = $pgUp
+  $prevPageDown = $pgDn
+  $prevSpace = $space
+  Start-Sleep -Milliseconds 60
 }
 $form.Close()
+$hl.Close()
 
 if ($result) { Write-Output (ConvertTo-Json $result -Compress) } else { Write-Output (ConvertTo-Json @{ cancelled = $true } -Compress) }