diff --git a/3DTank/docs/KtRebuild_Plan.md b/3DTank/docs/KtRebuild_Plan.md
index 7ed9f1a..0c74446 100644
--- a/3DTank/docs/KtRebuild_Plan.md
+++ b/3DTank/docs/KtRebuild_Plan.md
@@ -143,7 +143,7 @@
     `names/root_wiring.json` + `TankiOffline/.../App/State/RootState.kt`、`RootWiring.kt`。
     - 根状态 `z6`（`TOState`）的 **89 个槽位**全部入表；字段顺序取 `toString`，槽位取构造函数 `<名>_1`。
     - 根 reducer `k6` 的逐切片委派记全：reducer 引用、委派表达式、顶层 `instanceof` 动作名。
-  - 已迁移切片 **6/89**：
+  - 已迁移切片 **7/89**：
     - `inviteState` → `aD` / `pD.er5`（`InviteReducer.kt`）
     - `loginByPassword` → `gD` / `MD.cr6`（`LoginReducer.kt`，含 `SetLogin`/`SetPassword` 把 status 打回 `NONE` 的原语义）
     - `twitchState` → `g9` / `y9.gta`（`TwitchReducer.kt`；`SetAccount` 是 Twitch 账号，不是 UID）
@@ -153,9 +153,14 @@
       嵌套 `U7`（`Categories`，7 字段）5 臂、`w3`（`ShopItems`，23 字段）32 臂，共 **69 个 instanceof 动作** 全量翻译。
       无 `toString` 的 `Yut/F5/g4/X5/w5/o4/m4/k4/i4/t4/f5/v5/p5/H7/s5/o5/_5` 按效果定名
       （`ShopLoaded`/`ResetShop`/…/`AddCategoriesWithBonus`/…），原名保留在 `ShopReducer.kt` 注释里。
-  - `App/State/RootReducer.kt`：`ReduceRoot(State0, Action)` 只归约上述六片，其余 **83 个字段原样透传**；
-    迁移进度用 `RootReducer.Coverage`（`已迁移 6/89`）与 `RootWiring.Unmigrated` 暴露。
-  - 自检：`TankiOffline/tools/RunStateTest.ps1` **120 项全绿**，含 89 槽位完整性、六片一次归约互不串片、未迁移字段透传，
+    - `screen` → `WK` / `dY().ks5`（`ScreenReducer.kt`）：10 字段，13 个 `instanceof` 臂全量翻译。
+      `GoTo` 的新栈规则 = `isResetBackStackOnNextGoTo ? [] : history ? stack + current : stack`，
+      `current` 换成目标屏并清 `isResetBackStackOnNextGoTo` / `isDelayedGoto`；`screen_show` analytics 是副作用，纯 reducer 只保留状态。
+      屏幕身份用 `App.State.ScreenId`（`EntranceScreen` / `LoaderScreen` / `NamedScreen(name)`）；
+      `LX` / `RX` 是屏幕标识类，已从动作表剔除并记入 `root_wiring.json` 的 `Markers`（`screen-id-class`）。
+  - `App/State/RootReducer.kt`：`ReduceRoot(State0, Action)` 只归约上述七片，其余 **82 个字段原样透传**；
+    迁移进度用 `RootReducer.Coverage`（`已迁移 7/89`）与 `RootWiring.Unmigrated` 暴露。
+  - 自检：`TankiOffline/tools/RunStateTest.ps1` **141 项全绿**，含 89 槽位完整性、七片一次归约互不串片、未迁移字段透传，
     以及用 `action_trace_merged.json` 真实派发的两条商店动作（`SetCoinPaymentProviderUrl` / `ToggleShopActivity`）回放。
   - 委派表里的已知形态：`shop` / `home` / `localBattleUserState` / `partner` 是内联 IIFE，
     已按字段具名为 `(inline@<field>)` 并从函数体抓到顶层动作名（69 / 1 / 2 / 11 个）；
diff --git a/3DTank/names/root_wiring.json b/3DTank/names/root_wiring.json
index 2d1d74e..abd8cb0 100644
--- a/3DTank/names/root_wiring.json
+++ b/3DTank/names/root_wiring.json
@@ -1,5 +1,5 @@
 {
-  "generatedAt": "2026-10-22T18:11:10.717Z",
+  "generatedAt": "2026-10-22T19:22:01.390Z",
   "module": "module_10032.js",
   "RootState": {
     "Class": "z6",
@@ -12,7 +12,8 @@
     "twitchState",
     "home",
     "localBattleUserState",
-    "shop"
+    "shop",
+    "screen"
   ],
   "AnonymousActions": [
     {
@@ -123,6 +124,60 @@
       "Name": "RemoveDiscountItemForItem",
       "DispatchedAt": "未在 action_trace_merged.json 中出现；按 reducer 分支效果定名",
       "Effect": "U7/w3.discountItems 删除键 ct3_1"
+    },
+    {
+      "Local": "sC",
+      "Name": "DisableForeground",
+      "DispatchedAt": "未在 action_trace_merged.json 中出现；按 reducer 分支效果定名",
+      "Effect": "foreground = false（`n.vs4(cd, cd, !1)`）"
+    },
+    {
+      "Local": "oC",
+      "Name": "EnableForeground",
+      "DispatchedAt": "未在 action_trace_merged.json 中出现；按 reducer 分支效果定名",
+      "Effect": "foreground = true（`n.vs4(cd, cd, !0)`）"
+    },
+    {
+      "Local": "eY",
+      "Name": "ClearScreenStack",
+      "DispatchedAt": "未在 action_trace_merged.json 中出现；按 reducer 分支效果定名",
+      "Effect": "screenStack = emptyList()（`n.vs4(cd, cd, cd, md())`）"
+    },
+    {
+      "Local": "uY",
+      "Name": "ResetScreenStackOnNextGoTo",
+      "DispatchedAt": "未在 action_trace_merged.json 中出现；按 reducer 分支效果定名",
+      "Effect": "isResetBackStackOnNextGoTo = true（第 6 个构造参数 !0）"
+    },
+    {
+      "Local": "sY",
+      "Name": "DelayNextGoTo",
+      "DispatchedAt": "未在 action_trace_merged.json 中出现；按 reducer 分支效果定名",
+      "Effect": "isDelayedGoto = true（第 7 个构造参数 !0）"
+    },
+    {
+      "Local": "oY",
+      "Name": "FilterScreenStack",
+      "DispatchedAt": "未在 action_trace_merged.json 中出现；按 reducer 分支效果定名",
+      "Effect": "screenStack = stack.filter(predicate)（`for (…) e(o) && u.y(o)`，默认谓词 YK 恒 false）"
+    },
+    {
+      "Local": "lY",
+      "Name": "EnableBack",
+      "DispatchedAt": "未在 action_trace_merged.json 中出现；按 reducer 分支效果定名",
+      "Effect": "enableBack = true（第 5 个构造参数 !0）"
+    },
+    {
+      "Local": "cY",
+      "Name": "DisableBack",
+      "DispatchedAt": "未在 action_trace_merged.json 中出现；按 reducer 分支效果定名",
+      "Effect": "enableBack = false（第 5 个构造参数 !1）"
+    },
+    {
+      "Local": "fY",
+      "Name": "PopScreen",
+      "DispatchedAt": "未在 action_trace_merged.json 中出现；按 reducer 分支效果定名",
+      "Effect": "screenStack = dropLast(1)（`f$(stack, 1)` 是 Kotlin dropLast）"
     }
   ],
   "Markers": [
@@ -135,6 +190,16 @@
       "Local": "x4",
       "Kind": "marker-action",
       "Evidence": "`fd(x4, \"\", cd, Wm)`；根 reducer 的 `Xd(t, $4) || t instanceof x4` 同样走 U7+w3 快路径，本身无字段、无独立效果。"
+    },
+    {
+      "Local": "LX",
+      "Kind": "screen-id-class",
+      "Evidence": "屏幕标识类 Entrance：`function LX(){ this.gs5_1=\"Entrance\" }`，`ld(LX).m()` 返回 \"Entrance\"；GoTo 分支用它判断 analytics 事件是否 isModal。"
+    },
+    {
+      "Local": "RX",
+      "Kind": "screen-id-class",
+      "Evidence": "屏幕标识类 System.Loader：`function RX(){ this.ysb_1=\"System.Loader\" }`，`PX()` 返回该单例，也是 WK.current 的默认值；GoTo 到它时不发 screen_show。"
     }
   ],
   "Rows": [
@@ -183,24 +248,22 @@
       "Reducer": "dY().ks5",
       "Delegate": "dY().ks5(t, n.zpu_1)",
       "Actions": [
-        "?LX",
-        "?RX",
-        "?cY",
-        "?eY",
-        "?fY",
-        "?lY",
-        "?oC",
-        "?oY",
-        "?sC",
-        "?sY",
-        "?uY",
+        "ClearScreenStack",
+        "DelayNextGoTo",
+        "DisableBack",
+        "DisableForeground",
         "DisplayMainEntranceScreen",
         "DisplayReauthorizationMessage",
+        "EnableBack",
+        "EnableForeground",
+        "FilterScreenStack",
         "GoTo",
-        "PressedAnyButton"
+        "PopScreen",
+        "PressedAnyButton",
+        "ResetScreenStackOnNextGoTo"
       ],
       "Default": "new WK(PX())",
-      "Migrated": false
+      "Migrated": true
     },
     {
       "Field": "modalScreen",
diff --git a/3DTank/tools/gen_action_kt.js b/3DTank/tools/gen_action_kt.js
index 538cb89..8a5493b 100644
--- a/3DTank/tools/gen_action_kt.js
+++ b/3DTank/tools/gen_action_kt.js
@@ -563,6 +563,14 @@ function InferDeep(Expr, Mod, Off, Depth) {
   return null;
 }
 
+// 个别字段的调用点/运行时证据只能是 Any?（例如 GoTo 样例里的 screen=[object Object]），
+// 但切片 reducer 已经能给出强类型时在这里显式指定。键：`类名.字段`。
+//   GoTo.screen：QK.grm_1 在 screen 切片里只按 ScreenId 使用（instanceof LX/RX + m()/equals），
+//   类型定义见 TankiOffline/.../App/State/ScreenId.kt。
+const FieldTypeOverrides = new Map([
+  ['GoTo.screen', 'ScreenId'],
+]);
+
 const Emitted = [];
 // 动作目录：类名 + 字段(名, 类型)，用于生成 ActionCatalog.kt（运行时按名字查类）
 const Catalog = [];
@@ -639,6 +647,8 @@ for (const R of Inventory.Rows) {
       if (C.Ok) Type = C.Type;
       else { Note = '// 未收录类型: ' + C.Bad + '（' + Source + '）'; Type = null; }
     }
+    const Override = FieldTypeOverrides.get(R.Name + '.' + F);
+    if (Override) { Type = Override; Source = 'override'; Note = ''; }
     if (Type) TypedFields++;
     if (Stats && !Type) {
       for (const S of Sites) {
diff --git a/3DTank/tools/gen_root_wiring.js b/3DTank/tools/gen_root_wiring.js
index 9fce9f4..d054255 100644
--- a/3DTank/tools/gen_root_wiring.js
+++ b/3DTank/tools/gen_root_wiring.js
@@ -58,6 +58,23 @@ const AnonymousActionNames = new Map([
   ['s5', 'InitPaymentModeAsShopItem'],
   ['o5', 'SetupDiscountItemForItem'],
   ['_5', 'RemoveDiscountItemForItem'],
+  // 屏幕切片（WK / wY.ks5 第 34950 行）：没有 toString / 不在 action_inventory 的 9 个类。
+  ['sC', 'DisableForeground'],
+  ['oC', 'EnableForeground'],
+  ['eY', 'ClearScreenStack'],
+  ['uY', 'ResetScreenStackOnNextGoTo'],
+  ['sY', 'DelayNextGoTo'],
+  ['oY', 'FilterScreenStack'],
+  ['lY', 'EnableBack'],
+  ['cY', 'DisableBack'],
+  ['fY', 'PopScreen'],
+]);
+
+// 非动作的 `instanceof`：屏幕标识类，用于 GoTo 分支判断（不是 dispatch 的动作）。
+// 它们从 Actions 列表里剔除，改记到 root_wiring.json 的 Markers。
+const NonActionInstanceof = new Map([
+  ['LX', '屏幕标识类 Entrance：`function LX(){ this.gs5_1="Entrance" }`，`ld(LX).m()` 返回 "Entrance"；GoTo 分支用它判断 analytics 事件是否 isModal。'],
+  ['RX', '屏幕标识类 System.Loader：`function RX(){ this.ysb_1="System.Loader" }`，`PX()` 返回该单例，也是 WK.current 的默认值；GoTo 到它时不发 screen_show。'],
 ]);
 
 /** 动作局部类名 → 动作名；未收录的返回 null。 */
@@ -296,6 +313,7 @@ function BodyOfRef(Ref) {
 function NamesInMasked(Masked) {
   const Names = new Set();
   for (const M of Masked.matchAll(/instanceof ([A-Za-z0-9_$]+)/g)) {
+    if (NonActionInstanceof.has(M[1])) continue;
     const N = ActionNameOf(M[1]);
     Names.add(N || '?' + M[1]);
   }
@@ -414,6 +432,7 @@ const Migrated = {
   home: { Type: 'HomeStateSlice', Reduce: 'ReduceHome' },
   localBattleUserState: { Type: 'LocalBattleUserStateSlice', Reduce: 'ReduceLocalBattleUser' },
   shop: { Type: 'ShopStateSlice', Reduce: 'ReduceShop' },
+  screen: { Type: 'ScreenStateSlice', Reduce: 'ReduceScreen' },
 };
 
 for (const R of Rows) R.Migrated = Object.prototype.hasOwnProperty.call(Migrated, R.Field);
@@ -455,6 +474,19 @@ const ShopAnonymousEffects = {
   _5: 'U7/w3.discountItems 删除键 ct3_1',
 };
 
+// screen 切片（WK / wY.ks5）的匿名动作：按 reducer 分支效果定名。
+const ScreenAnonymousEffects = {
+  sC: 'foreground = false（`n.vs4(cd, cd, !1)`）',
+  oC: 'foreground = true（`n.vs4(cd, cd, !0)`）',
+  eY: 'screenStack = emptyList()（`n.vs4(cd, cd, cd, md())`）',
+  uY: 'isResetBackStackOnNextGoTo = true（第 6 个构造参数 !0）',
+  sY: 'isDelayedGoto = true（第 7 个构造参数 !0）',
+  oY: 'screenStack = stack.filter(predicate)（`for (…) e(o) && u.y(o)`，默认谓词 YK 恒 false）',
+  lY: 'enableBack = true（第 5 个构造参数 !0）',
+  cY: 'enableBack = false（第 5 个构造参数 !1）',
+  fY: 'screenStack = dropLast(1)（`f$(stack, 1)` 是 Kotlin dropLast）',
+};
+
 fs.writeFileSync(
   path.join(P, 'names', 'root_wiring.json'),
   JSON.stringify(
@@ -477,6 +509,12 @@ fs.writeFileSync(
           DispatchedAt: '未在 action_trace_merged.json 中出现；按 reducer 分支效果定名',
           Effect,
         })),
+        ...Object.entries(ScreenAnonymousEffects).map(([Local, Effect]) => ({
+          Local,
+          Name: AnonymousActionNames.get(Local),
+          DispatchedAt: '未在 action_trace_merged.json 中出现；按 reducer 分支效果定名',
+          Effect,
+        })),
       ],
       Markers: [
         {
@@ -489,6 +527,11 @@ fs.writeFileSync(
           Kind: 'marker-action',
           Evidence: '`fd(x4, "", cd, Wm)`；根 reducer 的 `Xd(t, $4) || t instanceof x4` 同样走 U7+w3 快路径，本身无字段、无独立效果。',
         },
+        ...[...NonActionInstanceof].map(([Local, Evidence]) => ({
+          Local,
+          Kind: 'screen-id-class',
+          Evidence,
+        })),
       ],
       Rows,
     },
diff --git a/TankiOffline/app/src/jsMain/kotlin/App/State/ActionCatalog.kt b/TankiOffline/app/src/jsMain/kotlin/App/State/ActionCatalog.kt
index a39908b..9f83f46 100644
--- a/TankiOffline/app/src/jsMain/kotlin/App/State/ActionCatalog.kt
+++ b/TankiOffline/app/src/jsMain/kotlin/App/State/ActionCatalog.kt
@@ -422,7 +422,7 @@ object ActionCatalog {
         ActionMeta("ReferralEventEnterPromoCodeStatus", ReferralEventEnterPromoCodeStatus::class, listOf(ActionFieldMeta("referralEventEnterCodeStatus", "Any?"))),
         ActionMeta("TemporaryCashExpiredInfo", TemporaryCashExpiredInfo::class, listOf(ActionFieldMeta("temporaryCashData", "Any?"))),
         ActionMeta("Screen", Screen::class, listOf(ActionFieldMeta("current", "Any?"), ActionFieldMeta("loaderBackgroundImage", "Any?"), ActionFieldMeta("foreground", "Any?"), ActionFieldMeta("screenStack", "Any?"), ActionFieldMeta("enableBack", "Any?"), ActionFieldMeta("isResetBackStackOnNextGoTo", "Any?"), ActionFieldMeta("isDelayedGoto", "Any?"), ActionFieldMeta("pressedAnyButton", "Any?"), ActionFieldMeta("displayMainEntranceScreen", "Any?"), ActionFieldMeta("needReauthorization", "Any?"))),
-        ActionMeta("GoTo", GoTo::class, listOf(ActionFieldMeta("screen", "Any?"), ActionFieldMeta("history", "Boolean"))),
+        ActionMeta("GoTo", GoTo::class, listOf(ActionFieldMeta("screen", "ScreenId"), ActionFieldMeta("history", "Boolean"))),
         ActionMeta("DisplayMainEntranceScreen", DisplayMainEntranceScreen::class, listOf(ActionFieldMeta("isDisplayed", "Boolean"))),
         ActionMeta("PressedAnyButton", PressedAnyButton::class, listOf(ActionFieldMeta("isPressed", "Boolean"))),
         ActionMeta("DisplayReauthorizationMessage", DisplayReauthorizationMessage::class, listOf(ActionFieldMeta("isDisplay", "Boolean"))),
diff --git a/TankiOffline/app/src/jsMain/kotlin/App/State/Inventory.kt b/TankiOffline/app/src/jsMain/kotlin/App/State/Inventory.kt
index ec32e58..2e6204b 100644
--- a/TankiOffline/app/src/jsMain/kotlin/App/State/Inventory.kt
+++ b/TankiOffline/app/src/jsMain/kotlin/App/State/Inventory.kt
@@ -5,7 +5,7 @@ package App.State
 
 import Core.Vector3
 
-// 动作/状态类共 816 个，字段 2150 个（已定类型 508 个）
+// 动作/状态类共 816 个，字段 2150 个（已定类型 509 个）
 data class AnnouncementState(
     val isEnabled: Any?,  // 仅 copy 转发（无类型信息）
     val modelLoaded: Any?,  // 仅 copy 转发（无类型信息）
@@ -2408,7 +2408,7 @@ data class Screen(
 )
 
 data class GoTo(
-    val screen: Any?,  // 未收录类型: Any?（runtime）
+    val screen: ScreenId,  // override
     val history: Boolean,  // runtime
 )
 
diff --git a/TankiOffline/app/src/jsMain/kotlin/App/State/Reducers/ScreenReducer.kt b/TankiOffline/app/src/jsMain/kotlin/App/State/Reducers/ScreenReducer.kt
new file mode 100644
index 0000000..4530e70
--- /dev/null
+++ b/TankiOffline/app/src/jsMain/kotlin/App/State/Reducers/ScreenReducer.kt
@@ -0,0 +1,112 @@
+// ScreenReducer.kt —— 屏幕导航切片（对应 module_10032 的 WK 状态 + wY.ks5 reducer）
+//
+// 证据链：
+//   状态类 WK：`function WK(t, n, i, r, e, u, s, o, _, h)`，10 个字段，toString 名为 `Screen(...)`。
+//     默认值取自构造：current = PX()（LoaderScreen）、loaderBackgroundImage = null、
+//     foreground = false、screenStack = md()（emptyList）、enableBack = true（`e === cd || e`）、
+//     isResetBackStackOnNextGoTo / isDelayedGoto / pressedAnyButton / displayMainEntranceScreen /
+//     needReauthorization 均 false。
+//   reducer：`ld(wY).ks5`（module_10032 第 34950 行）13 个 instanceof 臂。
+//
+//   sC → foreground = false                   oC → foreground = true
+//   eY → screenStack = []                     uY → isResetBackStackOnNextGoTo = true
+//   sY → isDelayedGoto = true                 lY → enableBack = true
+//   cY → enableBack = false                   fY → screenStack = dropLast(1)（原 `f$(stack, 1)`）
+//   oY → screenStack = stack.filter(predicate)（原 `e(o) && u.y(o)`，kd() 是 ArrayList）
+//   QK → GoTo（见下）                          hY → pressedAnyButton = action.isPressed
+//   _Y → displayMainEntranceScreen = action.isDisplayed
+//   aY → needReauthorization = action.isDisplay
+//
+//   GoTo 分支（原 IIFE，`ks5` 内调用参数为 (0, t, n)）：
+//     新栈 = isResetBackStackOnNextGoTo ? [] : history ? stack + current : stack
+//     current = 目标；enableBack 不变；isResetBackStackOnNextGoTo / isDelayedGoto 归 false。
+//     原代码还会用 `rk().boz(u)` 发一条 screen_show analytics（目标等于当前时不发，
+//     Entrance 带 isModal=true，System.Loader 不发）；这是副作用，纯 reducer 只保留状态变化。
+//
+// 无 toString 的 9 个类按 reducer 效果定名，原名写在注释里；名字同时登记在
+// 3DTank/tools/gen_root_wiring.js 的 AnonymousActionNames，重新生成 RootWiring 后显示。
+package App.State.Reducers
+
+import App.State.DisplayMainEntranceScreen
+import App.State.DisplayReauthorizationMessage
+import App.State.GoTo
+import App.State.LoaderScreen
+import App.State.PressedAnyButton
+import App.State.ScreenId
+
+/** 原 `sC`：无字段；`foreground = false`。 */
+object DisableForeground
+
+/** 原 `oC`：无字段；`foreground = true`。 */
+object EnableForeground
+
+/** 原 `eY`：无字段；`screenStack = emptyList()`。 */
+object ClearScreenStack
+
+/** 原 `uY`：无字段；`isResetBackStackOnNextGoTo = true`。 */
+object ResetScreenStackOnNextGoTo
+
+/** 原 `sY`：无字段；`isDelayedGoto = true`。 */
+object DelayNextGoTo
+
+/**
+ * 原 `oY(predicate)`：只保留 predicate 为 true 的屏幕（`for (…) e(o) && u.y(o)`）。
+ * 默认谓词是原 `YK`（恒 false），所以缺省调用会清空历史栈。
+ */
+data class FilterScreenStack(val predicate: (ScreenId) -> Boolean = { false })
+
+/** 原 `lY`：无字段；`enableBack = true`。 */
+object EnableBack
+
+/** 原 `cY`：无字段；`enableBack = false`。 */
+object DisableBack
+
+/** 原 `fY`：无字段；`screenStack = dropLast(1)`。 */
+object PopScreen
+
+/**
+ * 原 `WK` / `Screen`：`Screen(current, loaderBackgroundImage, foreground, screenStack, enableBack,
+ * isResetBackStackOnNextGoTo, isDelayedGoto, pressedAnyButton, displayMainEntranceScreen, needReauthorization)`。
+ */
+data class ScreenStateSlice(
+    val Current: ScreenId = LoaderScreen,
+    /** 本 reducer 只 copy 转发、从不写；源码没有给出元素类型，保留 Any?。 */
+    val LoaderBackgroundImage: Any? = null,
+    val Foreground: Boolean = false,
+    val ScreenStack: List<ScreenId> = emptyList(),
+    val EnableBack: Boolean = true,
+    val IsResetBackStackOnNextGoTo: Boolean = false,
+    val IsDelayedGoto: Boolean = false,
+    val PressedAnyButton: Boolean = false,
+    val DisplayMainEntranceScreen: Boolean = false,
+    val NeedReauthorization: Boolean = false,
+)
+
+/** 根 reducer 的 screen 分支（原 `dY().ks5(t, n.zpu_1)`）。 */
+fun ReduceScreen(State0: ScreenStateSlice, A: Any): ScreenStateSlice = when (A) {
+    is DisableForeground -> State0.copy(Foreground = false)
+    is EnableForeground -> State0.copy(Foreground = true)
+    is ClearScreenStack -> State0.copy(ScreenStack = emptyList())
+    is ResetScreenStackOnNextGoTo -> State0.copy(IsResetBackStackOnNextGoTo = true)
+    is DelayNextGoTo -> State0.copy(IsDelayedGoto = true)
+
+    is GoTo -> State0.copy(
+        Current = A.screen,
+        ScreenStack = when {
+            State0.IsResetBackStackOnNextGoTo -> emptyList()
+            A.history -> State0.ScreenStack + State0.Current
+            else -> State0.ScreenStack
+        },
+        IsResetBackStackOnNextGoTo = false,
+        IsDelayedGoto = false,
+    )
+
+    is FilterScreenStack -> State0.copy(ScreenStack = State0.ScreenStack.filter(A.predicate))
+    is EnableBack -> State0.copy(EnableBack = true)
+    is DisableBack -> State0.copy(EnableBack = false)
+    is PopScreen -> State0.copy(ScreenStack = State0.ScreenStack.dropLast(1))
+    is PressedAnyButton -> State0.copy(PressedAnyButton = A.isPressed)
+    is DisplayMainEntranceScreen -> State0.copy(DisplayMainEntranceScreen = A.isDisplayed)
+    is DisplayReauthorizationMessage -> State0.copy(NeedReauthorization = A.isDisplay)
+    else -> State0
+}
diff --git a/TankiOffline/app/src/jsMain/kotlin/App/State/RootReducer.kt b/TankiOffline/app/src/jsMain/kotlin/App/State/RootReducer.kt
index 0362fda..55a805f 100644
--- a/TankiOffline/app/src/jsMain/kotlin/App/State/RootReducer.kt
+++ b/TankiOffline/app/src/jsMain/kotlin/App/State/RootReducer.kt
@@ -9,8 +9,9 @@
 //   home             → ReduceHome（s1 / 根 reducer 的 `(inline@home)` 分支）
 //   localBattleUserState → ReduceLocalBattleUser（lE / `(inline@localBattleUserState)` 分支）
 //   shop             → ReduceShop（j4 / `(inline@shop)` 分支）
+//   screen           → ReduceScreen（WK / dY().ks5）
 //
-// 其余 83 个字段按原样透传（defaultValue 取原构造）。每个切片 reducer 对无关动作都返回原状态，
+// 其余 82 个字段按原样透传（defaultValue 取原构造）。每个切片 reducer 对无关动作都返回原状态，
 // 所以一次 copy 里串起全部已迁移 reducer，与按动作路由再归约的结果一致。
 // 迁移进度与每个字段的证据见生成物 RootWiring.kt（不要手改）。
 package App.State
@@ -19,6 +20,7 @@ import App.State.Reducers.ReduceHome
 import App.State.Reducers.ReduceInvite
 import App.State.Reducers.ReduceLocalBattleUser
 import App.State.Reducers.ReduceLoginByPassword
+import App.State.Reducers.ReduceScreen
 import App.State.Reducers.ReduceShop
 import App.State.Reducers.ReduceTwitch
 
@@ -41,6 +43,7 @@ object RootReducer {
         Home = ReduceHome(State0.Home, Action),
         LocalBattleUserState = ReduceLocalBattleUser(State0.LocalBattleUserState, Action),
         Shop = ReduceShop(State0.Shop, Action),
+        Screen = ReduceScreen(State0.Screen, Action),
     )
 }
 
diff --git a/TankiOffline/app/src/jsMain/kotlin/App/State/RootState.kt b/TankiOffline/app/src/jsMain/kotlin/App/State/RootState.kt
index efb7af7..f6c6788 100644
--- a/TankiOffline/app/src/jsMain/kotlin/App/State/RootState.kt
+++ b/TankiOffline/app/src/jsMain/kotlin/App/State/RootState.kt
@@ -8,6 +8,7 @@ import App.State.Reducers.HomeStateSlice
 import App.State.Reducers.InviteStateSlice
 import App.State.Reducers.LocalBattleUserStateSlice
 import App.State.Reducers.LoginByPasswordStateSlice
+import App.State.Reducers.ScreenStateSlice
 import App.State.Reducers.ShopStateSlice
 import App.State.Reducers.TwitchStateSlice
 
@@ -18,8 +19,8 @@ import App.State.Reducers.TwitchStateSlice
 data class RootState(
     /** 原 user（t8 / M8().qtd）。未迁移：原样透传。 */
     val User: Any? = null,
-    /** 原 screen（WK / dY().ks5）。未迁移：原样透传。 */
-    val Screen: Any? = null,
+    /** 原 screen（WK / dY().ks5）。已迁移。 */
+    val Screen: ScreenStateSlice = ScreenStateSlice(),
     /** 原 modalScreen（nV / Fs.js1）。未迁移：原样透传。 */
     val ModalScreen: Any? = null,
     /** 原 battleStatistics（jR / rr.fqr）。未迁移：原样透传。 */
diff --git a/TankiOffline/app/src/jsMain/kotlin/App/State/RootWiring.kt b/TankiOffline/app/src/jsMain/kotlin/App/State/RootWiring.kt
index 315e89a..12b6f4a 100644
--- a/TankiOffline/app/src/jsMain/kotlin/App/State/RootWiring.kt
+++ b/TankiOffline/app/src/jsMain/kotlin/App/State/RootWiring.kt
@@ -15,7 +15,7 @@ data class SliceWiring(
 object RootWiring {
     val All: List<SliceWiring> = listOf(
         SliceWiring("user", "ypu_1", "t8", "M8().qtd", "M8().qtd(t, n.ypu_1)", listOf("?R8", "?p8", "?v8", "AddCoins", "AddRubies", "SetBatteryLevel", "SetClanInfo", "SetCoins", "SetDisabledWithoutPremiumLocations", "SetHasTemporaryCash", "SetPremiumExpirationTime", "SetRankNames", "SetRubies", "SetUserId", "SetUserPropertiesAction", "SpendCoins", "SpendCrystals", "SpendRubies", "UpdateClanTag", "UpdateCrystals", "UpdateEventPass", "UpdateGearScore", "UpdatePremium", "UpdateRank", "UpdateScore", "UpdateUid", "UpdateUserRating")),
-        SliceWiring("screen", "zpu_1", "WK", "dY().ks5", "dY().ks5(t, n.zpu_1)", listOf("?LX", "?RX", "?cY", "?eY", "?fY", "?lY", "?oC", "?oY", "?sC", "?sY", "?uY", "DisplayMainEntranceScreen", "DisplayReauthorizationMessage", "GoTo", "PressedAnyButton")),
+        SliceWiring("screen", "zpu_1", "WK", "dY().ks5", "dY().ks5(t, n.zpu_1)", listOf("ClearScreenStack", "DelayNextGoTo", "DisableBack", "DisableForeground", "DisplayMainEntranceScreen", "DisplayReauthorizationMessage", "EnableBack", "EnableForeground", "FilterScreenStack", "GoTo", "PopScreen", "PressedAnyButton", "ResetScreenStackOnNextGoTo")),
         SliceWiring("modalScreen", "apv_1", "nV", "Fs.js1", "Fs.js1(t, n.apv_1)", listOf("?XW", "AddModal", "RemoveCurrentByName", "RemoveModal")),
         SliceWiring("battleStatistics", "bpv_1", "jR", "rr.fqr", "rr.fqr(t, n.bpv_1)", listOf("?DR", "?HR", "?KR", "?PR", "?QR", "?UR", "?XR", "?YR", "?ZR", "?nP", "?tP", "Init", "InitBattleModeWithLevels", "SetBattleMode", "SetDisplayClientInfo", "SetFlagOrBallOwner", "SetRankRange", "SetReArmor", "SetRemainingTime", "SetRoundRestartTime", "UpdateFund", "UpdateScore")),
         SliceWiring("battleTutorial", "cpv_1", "rE", "Q.sq8", "Q.sq8(t, n.cpv_1)", listOf("?oE", "?sE", "SetFragsCount", "ShowMessage")),
@@ -106,7 +106,7 @@ object RootWiring {
     )
 
     /** 已迁移（由 RootReducer 真正归约）的字段。 */
-    val Migrated: Set<String> = setOf("inviteState", "loginByPassword", "twitchState", "home", "localBattleUserState", "shop")
+    val Migrated: Set<String> = setOf("inviteState", "loginByPassword", "twitchState", "home", "localBattleUserState", "shop", "screen")
 
     /** 未迁移字段：归约时原样透传，作为后续迁移清单。 */
     val Unmigrated: List<SliceWiring> get() = All.filter { it.Field !in Migrated }
diff --git a/TankiOffline/app/src/jsMain/kotlin/App/State/ScreenId.kt b/TankiOffline/app/src/jsMain/kotlin/App/State/ScreenId.kt
new file mode 100644
index 0000000..9362dbc
--- /dev/null
+++ b/TankiOffline/app/src/jsMain/kotlin/App/State/ScreenId.kt
@@ -0,0 +1,30 @@
+// ScreenId.kt —— 屏幕标识（原 module_10032 的 XX 体系里，screen 切片真正用到的部分）
+//
+// 证据链：
+//   · WK.current 默认 `PX()` → `RX` 单例，`ld(RX).m()` 返回 "System.Loader"。
+//   · 根 reducer 的 GoTo 分支只对目标做 `instanceof LX`（Entrance，`m()` = "Entrance"）
+//     与 `instanceof RX`（System.Loader）判别，其余屏幕只取 `m()` 当 analytics 的 screen 名。
+//   · 其余屏幕类（UX=Shop、FX=Garage、eX=Lobby.Home …）的字段只在各自切片里使用；
+//     在那些切片迁移之前，这里先用「名字」承载身份，避免凭空补一层用不到的字段。
+//
+// 因此 ScreenId 只保留该 reducer 需要的三种能力：名字（analytics）、Entrance/Loader 判别、相等性。
+// 注意：同名的两个不同 Shop 类别在真实包里有不同字段，这里会折叠成同一个 NamedScreen；
+// 等 shop 屏幕对象（UX）本身成为状态切片时再替换成带字段的类。
+package App.State
+
+sealed interface ScreenId {
+    val name: String
+}
+
+/** 原 `LX`：`m() = "Entrance"`。 */
+object EntranceScreen : ScreenId {
+    override val name: String = "Entrance"
+}
+
+/** 原 `RX`：`m() = "System.Loader"`，也是 `WK` 的默认 current（`PX()`）。 */
+object LoaderScreen : ScreenId {
+    override val name: String = "System.Loader"
+}
+
+/** 其余屏幕：`m()` 返回带层级的路径，例如 "Lobby.Home" / "Lobby.Quests" / "Shop" / "Garage"。 */
+data class NamedScreen(override val name: String) : ScreenId
diff --git a/TankiOffline/app/src/jsMain/kotlin/App/StateCheck.kt b/TankiOffline/app/src/jsMain/kotlin/App/StateCheck.kt
index f3d9971..74d656d 100644
--- a/TankiOffline/app/src/jsMain/kotlin/App/StateCheck.kt
+++ b/TankiOffline/app/src/jsMain/kotlin/App/StateCheck.kt
@@ -9,8 +9,8 @@
 //   ⑥ 动作目录：816 个类与 138 个真实派发名对齐
 //   ⑦ 回放：真实 toString 样例的类/字段/类型校验
 //   ⑧ 全目录动作类都能按 KClass 路由
-//   ⑨~⑮ 切片 reducer：InviteState / LoginByPasswordState / TwitchState / HomeScreen / LocalBattleUserState /
-//        Shop（含 U7 类别表与 w3 物品表两个子 reducer）；⑭ 根 reducer 的 89 槽位委派
+//   ⑨~⑰ 切片 reducer：InviteState / LoginByPasswordState / TwitchState / HomeScreen / LocalBattleUserState /
+//        Shop（含 U7 类别表与 w3 物品表两个子 reducer）/ Screen；⑭ 根 reducer 的 89 槽位委派
 //
 // 用法：$env:TANKIOFFLINE_STATE_TEST='1'; node …（见 TankiOffline/tools/RunStateTest.ps1）
 package App
@@ -126,6 +126,24 @@ import App.State.SetReArmorTemporaryDisabled
 import App.State.SetRememberMe
 import App.State.SetStatus
 import App.State.SetTwitchEnabled
+import App.State.DisplayMainEntranceScreen
+import App.State.DisplayReauthorizationMessage
+import App.State.EntranceScreen
+import App.State.GoTo
+import App.State.LoaderScreen
+import App.State.NamedScreen
+import App.State.PressedAnyButton
+import App.State.Reducers.ClearScreenStack
+import App.State.Reducers.DelayNextGoTo
+import App.State.Reducers.DisableBack
+import App.State.Reducers.DisableForeground
+import App.State.Reducers.EnableBack
+import App.State.Reducers.EnableForeground
+import App.State.Reducers.FilterScreenStack
+import App.State.Reducers.PopScreen
+import App.State.Reducers.ReduceScreen
+import App.State.Reducers.ResetScreenStackOnNextGoTo
+import App.State.Reducers.ScreenStateSlice
 
 private data class AddFrags(val fragsCount: Int)
 private data class SetScreen(val screen: String)
@@ -563,14 +581,14 @@ object StateCheck {
                     LocalBattleW.Reducer == "(inline@localBattleUserState)"
             )
             Check(
-                "根：迁移表 = 六个已迁移字段，其余 83 个待迁",
+                "根：迁移表 = 七个已迁移字段，其余 82 个待迁",
                 RootReducer.Migrated ==
-                    setOf("inviteState", "loginByPassword", "twitchState", "home", "localBattleUserState", "shop") &&
-                    RootWiring.Unmigrated.size == 83
+                    setOf("inviteState", "loginByPassword", "twitchState", "home", "localBattleUserState", "shop", "screen") &&
+                    RootWiring.Unmigrated.size == 82
             )
 
-            // 一次 ReduceRoot 里五个切片各归约自己的动作，互不串片
-            val S0 = RootState(User = "user-1", Screen = "Preloader")
+            // 一次 ReduceRoot 里六个切片各归约自己的动作，互不串片
+            val S0 = RootState(User = "user-1", Screen = ScreenStateSlice(Current = NamedScreen("Preloader")))
             val S1 = ReduceRoot(S0, ApplyInvite("uid-1"))
             Check(
                 "根：ApplyInvite 只动 inviteState",
@@ -619,10 +637,10 @@ object StateCheck {
             // 未迁移字段原样透传；无关动作不改变任何字段
             Check(
                 "根：未迁移字段原样透传",
-                S5.User == "user-1" && S5.Screen == "Preloader"
+                S5.User == "user-1" && S5.Screen.Current == NamedScreen("Preloader")
             )
             Check("根：无关动作返回等值状态", ReduceRoot(S5, AddFrags(1)) == S5)
-            Check("根：Coverage 文本", RootReducer.Coverage == "已迁移 6/89")
+            Check("根：Coverage 文本", RootReducer.Coverage == "已迁移 7/89")
 
             val Store = ReduxStore(RootState(), { S, A -> ReduceRoot(S, A) })
             Store.Dispatch(SetStatus("LOGGING_IN"))
@@ -924,6 +942,131 @@ object StateCheck {
             // 69 个动作里只有 x4 是标记接口（没有独立效果），其余都已有名字
             val ShopUnknown = RootWiring.ByField("shop")!!.Actions.filter { it.startsWith("?") }
             Check("shop 回放：唯一未具名的是标记 x4", ShopUnknown == listOf("?x4"))
+
+            // ⑰ 切片 reducer：Screen（原 module_10032 的 WK / wY.ks5，13 个 instanceof 臂）
+            run {
+                val Lobby = NamedScreen("Lobby.Home")
+                val Shop = NamedScreen("Shop")
+
+                val S0 = ScreenStateSlice()
+                Check(
+                    "切片 Screen：默认值与原构造一致（current=System.Loader、enableBack=true）",
+                    S0.Current == LoaderScreen && S0.LoaderBackgroundImage == null && !S0.Foreground &&
+                        S0.ScreenStack.isEmpty() && S0.EnableBack && !S0.IsResetBackStackOnNextGoTo &&
+                        !S0.IsDelayedGoto && !S0.PressedAnyButton && !S0.DisplayMainEntranceScreen &&
+                        !S0.NeedReauthorization
+                )
+
+                Check(
+                    "切片 Screen：前景开关只改 foreground",
+                    !ReduceScreen(S0, DisableForeground).Foreground &&
+                        ReduceScreen(S0, EnableForeground).Foreground &&
+                        ReduceScreen(S0, EnableForeground).Current == LoaderScreen
+                )
+
+                val S1 = S0.copy(Current = Lobby, ScreenStack = listOf(NamedScreen("Preloader")))
+                Check(
+                    "切片 Screen：ClearScreenStack 清历史但保留 current",
+                    ReduceScreen(S1, ClearScreenStack).let { it.ScreenStack.isEmpty() && it.Current == Lobby }
+                )
+
+                val S2 = ReduceScreen(S1, GoTo(Shop, false))
+                Check(
+                    "切片 Screen：GoTo 无 history 只换 current",
+                    S2.Current == Shop && S2.ScreenStack == S1.ScreenStack
+                )
+
+                val S3 = ReduceScreen(S1, GoTo(Shop, true))
+                Check(
+                    "切片 Screen：GoTo history 把原 current 压栈",
+                    S3.Current == Shop && S3.ScreenStack == S1.ScreenStack + Lobby
+                )
+                Check(
+                    "切片 Screen：GoTo 到当前屏仍按 history 压栈（原包只在 analytics 里去重）",
+                    ReduceScreen(S1, GoTo(Lobby, true)).ScreenStack == listOf(NamedScreen("Preloader"), Lobby)
+                )
+
+                val S4 = ReduceScreen(S3.copy(IsResetBackStackOnNextGoTo = true), GoTo(Lobby, true))
+                Check(
+                    "切片 Screen：复位标志优先于 history，且 GoTo 后归 false",
+                    S4.Current == Lobby && S4.ScreenStack.isEmpty() && !S4.IsResetBackStackOnNextGoTo
+                )
+                Check(
+                    "切片 Screen：GoTo 清 isDelayedGoto",
+                    !ReduceScreen(S3.copy(IsDelayedGoto = true), GoTo(Shop, false)).IsDelayedGoto
+                )
+
+                Check(
+                    "切片 Screen：ResetScreenStackOnNextGoTo / DelayNextGoTo 各置本标志",
+                    ReduceScreen(S0, ResetScreenStackOnNextGoTo).IsResetBackStackOnNextGoTo &&
+                        ReduceScreen(S0, DelayNextGoTo).IsDelayedGoto
+                )
+
+                val S5 = S1.copy(ScreenStack = listOf(NamedScreen("Battle"), Lobby, Shop))
+                Check(
+                    "切片 Screen：FilterScreenStack 只保留 predicate 命中项",
+                    ReduceScreen(S5, FilterScreenStack { it.name == "Battle" }).ScreenStack ==
+                        listOf(NamedScreen("Battle"))
+                )
+                Check(
+                    "切片 Screen：FilterScreenStack 缺省谓词（原 YK）清空历史",
+                    ReduceScreen(S5, FilterScreenStack()).ScreenStack.isEmpty()
+                )
+
+                Check(
+                    "切片 Screen：EnableBack / DisableBack 切返回键",
+                    ReduceScreen(S0.copy(EnableBack = false), EnableBack).EnableBack &&
+                        !ReduceScreen(S0, DisableBack).EnableBack
+                )
+                Check(
+                    "切片 Screen：PopScreen 丢最后一个，空栈安全",
+                    ReduceScreen(S1, PopScreen).ScreenStack.isEmpty() &&
+                        ReduceScreen(S0, PopScreen).ScreenStack.isEmpty()
+                )
+                Check(
+                    "切片 Screen：PressedAnyButton 写 action.isPressed（false 也生效）",
+                    !ReduceScreen(S0.copy(PressedAnyButton = true), PressedAnyButton(false)).PressedAnyButton &&
+                        ReduceScreen(S0, PressedAnyButton(true)).PressedAnyButton
+                )
+                Check(
+                    "切片 Screen：DisplayMainEntranceScreen / DisplayReauthorizationMessage 各写本字段",
+                    ReduceScreen(S0, DisplayMainEntranceScreen(true)).DisplayMainEntranceScreen &&
+                        ReduceScreen(S0, DisplayReauthorizationMessage(true)).NeedReauthorization
+                )
+                Check("切片 Screen：无关动作不改状态", ReduceScreen(S1, AddFrags(1)) == S1)
+
+                // 根：screen 动作只动 screen，且与已迁移的其余六片共存
+                val R0 = RootState()
+                val R1 = ReduceRoot(R0, GoTo(Shop, false))
+                Check(
+                    "根：GoTo 只动 screen",
+                    R1.Screen.Current == Shop && R1.User == null && R1.Shop == R0.Shop &&
+                        R1.InviteState == R0.InviteState && R1.Home == R0.Home
+                )
+                val R2 = ReduceRoot(R1, EnableForeground)
+                Check(
+                    "根：EnableForeground 只动 screen 前景位",
+                    R2.Screen.Foreground && R2.Screen.Current == Shop &&
+                        R2.Screen.ScreenStack == R1.Screen.ScreenStack && R2.Shop == R1.Shop
+                )
+                Check("根：screen 迁移后无关动作仍返回等值状态", ReduceRoot(R2, AddFrags(1)) == R2)
+
+                val W = RootWiring.ByField("screen")!!
+                Check(
+                    "根：screen 委派到 WK / dY().ks5 且 13 个动作全部具名",
+                    W.SliceClass == "WK" && W.Reducer == "dY().ks5" && W.Actions.size == 13 &&
+                        W.Actions.none { it.startsWith("?") }
+                )
+                Check(
+                    "根：screen 的动作名覆盖 13 个 instanceof 臂",
+                    listOf(
+                        "DisableForeground", "EnableForeground", "ClearScreenStack",
+                        "ResetScreenStackOnNextGoTo", "DelayNextGoTo", "GoTo", "FilterScreenStack",
+                        "EnableBack", "DisableBack", "PopScreen", "PressedAnyButton",
+                        "DisplayMainEntranceScreen", "DisplayReauthorizationMessage",
+                    ).all { it in W.Actions }
+                )
+            }
         }
 
         val Failed = Results.filter { !it.second }