diff --git a/README.md b/README.md
index c7fa759..59d829f 100644
--- a/README.md
+++ b/README.md
@@ -204,9 +204,10 @@ Tags inside `.uix` templates map directly to native widgets:
 
 | Category | Tags |
 |---|---|
-| **Containers** | `div` (Flexbox: `flex-direction` / `flex` / `gap` / `padding`) |
+| **Containers** | `div` (Flexbox: `flex-direction` / `flex` / `gap` / `padding`), `Stack`, `SplitView` |
 | **Text** | `label` (multi-line, auto-wrap) |
 | **Buttons** | `button` |
+| **Navigation** | `NavItem` |
 | **Input** | `input` (type=`text` / `password` / `checkbox` / `radio` / `range` / `number`), `textarea` |
 | **Selection** | `toggle`, `select` |
 | **Status** | `progressbar` |
diff --git a/docs/c-api.md b/docs/c-api.md
index 5b2a591..86f4957 100644
--- a/docs/c-api.md
+++ b/docs/c-api.md
@@ -196,6 +196,20 @@ ui_tab_add(tabs, L"Title", content);
 ui_tab_get_active(tabs);
 ui_tab_set_active(tabs, 0);
 
+// Stack
+ui_stack_get_active_index(stack);
+ui_stack_set_active_index(stack, 0);
+
+// NavItem
+ui_nav_get_selected(nav);
+ui_nav_set_selected(nav, 1);
+
+// SplitView
+ui_split_set_pane(split, pane);
+ui_split_set_content(split, content);
+ui_split_set_mode(split, UI_SPLIT_VIEW_INLINE);
+ui_split_set_open(split, 1);
+
 // ScrollView
 ui_scroll_set_content(sv, content);
 
diff --git a/docs/uix-ai-guide.md b/docs/uix-ai-guide.md
index 06f69e1..243b2cd 100644
--- a/docs/uix-ai-guide.md
+++ b/docs/uix-ai-guide.md
@@ -244,8 +244,11 @@ CSS 子集 + 选择器 + cascade。常用属性：
 | 标签 | 作用 |
 |------|------|
 | `div` / `section` / `nav` | flex 容器 (默认 column) |
+| `Stack` | 只显示一个子页面的容器；`active` 指定当前索引 |
+| `SplitView` | 侧栏 + 内容双槽布局；前两个元素子节点分别作为侧栏和内容 |
 | `label` / `span` / `p` / `h1`-`h6` | 文本（不可编辑） |
 | `button` | 按钮 |
+| `NavItem` | 侧栏导航项；支持 `text` / `svg` / `glyph` / `selected` |
 | `input` | 文本输入；`type="password"` / `checkbox` / `radio` / `range` / `number` 切换形态 |
 | `textarea` | 多行文本 |
 | `toggle` | 开关 |
diff --git a/docs/uix-guide.md b/docs/uix-guide.md
index 2029c3b..c5930c0 100644
--- a/docs/uix-guide.md
+++ b/docs/uix-guide.md
@@ -539,11 +539,14 @@ obj.unknown          # 返回 null（不报错）
 | 标签 | Widget | 说明 |
 |---|---|---|
 | `<div>` | `VBoxWidget`（或 `HBoxWidget` 如果 `flex-direction: row`）| 通用容器 |
+| `<Stack active="0">` | `StackWidget` | 只显示一个直接子元素；`:active` 可反应式切换页面 |
+| `<SplitView mode="inline" open="true">` | `SplitViewWidget` | 恰好两个元素子节点，依次为 pane 和 content；`:open` 可反应式控制侧栏 |
 | `<span>` | `LabelWidget` | |
 | `<p>` | `LabelWidget`（支持换行）| **没有 inline 流**——子元素 `<strong>`/`<em>` 会堆叠显示，不会 inline 混排 |
 | `<h1>`–`<h6>` | `LabelWidget` | 预设字号 + 粗体 |
 | `<a>` | `LabelWidget` | 加 cursor:pointer（不自动导航）|
 | `<button>` | `ButtonWidget` | CSS `background-color` 映射 `SetCustomBgColor` |
+| `<NavItem text="..." selected="true"/>` | `NavItemWidget` | SplitView 侧栏导航项；`:text` / `:selected` 支持反应式绑定 |
 | `<input type="text"/>` | `TextInputWidget` | |
 | `<input type="checkbox"/>` | `CheckBoxWidget` | |
 | `<input type="radio"/>` | `RadioButtonWidget` | `name` 属性作为同组标识 |
@@ -574,6 +577,9 @@ obj.unknown          # 返回 null（不报错）
 | 标签 | 属性 | 作用 |
 |---|---|---|
 | `<TitleBar>` | `title`、`show-minimize`、`show-maximize`、`show-close`、`show-icon`（都是 `true`/`false`）| |
+| `<Stack>` | `active` | 初始显示的直接子元素索引 |
+| `<SplitView>` | `mode`、`open`、`openPaneLength`、`compactPaneLength` | mode 为 `overlay` / `inline` / `compactOverlay` / `compactInline` |
+| `<NavItem>` | `text`、`svg`、`glyph`、`selected` | `selected` 控制选中指示器 |
 | `<ProgressBar>` | `min`、`max`、`value`（数字）、`indeterminate`（true/1 = 动画 stripe）| 构造时解析 |
 | `<input type="range">` | `min`、`max`、`value` | |
 | `<input type="number">` | `min`、`max`、`value`、`step` | step 决定显示小数位 |
diff --git a/include/ui_core.h b/include/ui_core.h
index bd0d133..3a750ad 100644
--- a/include/ui_core.h
+++ b/include/ui_core.h
@@ -389,6 +389,7 @@ UI_API void ui_window_on_key(UiWindow win, UiWindowKeyCallback cb, void* userdat
 /* ------------------------------------------------------------------ */
 UI_API UiWidget ui_vbox(void);
 UI_API UiWidget ui_hbox(void);
+UI_API UiWidget ui_stack(void);
 UI_API UiWidget ui_spacer(float size);     /* 0 = expanding */
 UI_API UiWidget ui_panel(UiColor bg);
 UI_API UiWidget ui_panel_themed(int theme_color_id);  /* 0=sidebar_bg, 1=toolbar_bg, 2=content_bg */
@@ -410,6 +411,8 @@ UI_API UiWidget ui_toggle(const wchar_t* text);
 UI_API UiWidget ui_progress_bar(float min_val, float max_val, float value);
 UI_API UiWidget ui_tab_control(void);
 UI_API UiWidget ui_scroll_view(void);
+UI_API UiWidget ui_nav_item(const wchar_t* text, const char* svg);
+UI_API UiWidget ui_split_view(void);
 UI_API UiWidget ui_dialog(void);
 
 /* ------------------------------------------------------------------ */
@@ -853,6 +856,37 @@ UI_API void ui_tab_add(UiWidget tab_control, const wchar_t* title, UiWidget cont
 UI_API int  ui_tab_get_active(UiWidget tab_control);
 UI_API void ui_tab_set_active(UiWidget tab_control, int index);
 
+/* ------------------------------------------------------------------ */
+/* Stack                                                              */
+/* ------------------------------------------------------------------ */
+UI_API int  ui_stack_get_active_index(UiWidget stack);
+UI_API void ui_stack_set_active_index(UiWidget stack, int index);
+
+/* ------------------------------------------------------------------ */
+/* NavItem                                                            */
+/* ------------------------------------------------------------------ */
+UI_API int  ui_nav_get_selected(UiWidget nav_item);
+UI_API void ui_nav_set_selected(UiWidget nav_item, int selected);
+
+/* ------------------------------------------------------------------ */
+/* SplitView                                                          */
+/* ------------------------------------------------------------------ */
+typedef enum UiSplitViewMode {
+    UI_SPLIT_VIEW_OVERLAY = 0,
+    UI_SPLIT_VIEW_INLINE = 1,
+    UI_SPLIT_VIEW_COMPACT_OVERLAY = 2,
+    UI_SPLIT_VIEW_COMPACT_INLINE = 3
+} UiSplitViewMode;
+
+UI_API void ui_split_set_pane(UiWidget split_view, UiWidget pane);
+UI_API void ui_split_set_content(UiWidget split_view, UiWidget content);
+UI_API int  ui_split_get_open(UiWidget split_view);
+UI_API void ui_split_set_open(UiWidget split_view, int open);
+UI_API void ui_split_set_open_immediate(UiWidget split_view, int open);
+UI_API void ui_split_set_mode(UiWidget split_view, UiSplitViewMode mode);
+UI_API void ui_split_set_open_pane_length(UiWidget split_view, float length);
+UI_API void ui_split_set_compact_pane_length(UiWidget split_view, float length);
+
 /* ------------------------------------------------------------------ */
 /* ScrollView                                                         */
 /* ------------------------------------------------------------------ */
diff --git a/src/ui/page/compiler.cpp b/src/ui/page/compiler.cpp
index da7bac5..115c99f 100644
--- a/src/ui/page/compiler.cpp
+++ b/src/ui/page/compiler.cpp
@@ -914,6 +914,8 @@ void CompileElement(CompilerCtx& ctx,
         }
     }
 
+    bool isSplitView = (node.tag == "SplitView" || node.tag == "split-view");
+
     // ---- <svg>: fold child elements into SvgShape / SvgGradient entries ----
     // Children like <circle>/<rect>/... do NOT become widgets. Their static
     // attrs populate the shape; :attr bindings become CompiledBindings whose
@@ -1335,14 +1337,49 @@ void CompileElement(CompilerCtx& ctx,
             }
         }
         if (!reportedNest) {
+            int splitSlot = 0;
             for (const auto& c : node.children) {
                 if (c->kind == ui::uix::NodeKind::Element) {
+                    if (isSplitView && splitSlot >= 2) {
+                        ctx.out->errors.push_back(
+                            "<SplitView> accepts exactly two element children: pane and content");
+                        continue;
+                    }
                     CompileElement(ctx, *c, &m, w.get());
+                    if (isSplitView) ++splitSlot;
                 }
             }
         }
     }
 
+    // ---- <SplitView> post-process ----
+    // Children are compiled normally first so their bindings/events keep the
+    // same path as any other UIX subtree. Then assign the first child to the
+    // pane slot and the second to the content slot expected by SplitViewWidget.
+    if (isSplitView) {
+        auto* split = dynamic_cast<SplitViewWidget*>(w.get());
+        auto children = w->Children();
+        if (children.size() != 2) {
+            ctx.out->errors.push_back(
+                "<SplitView> requires exactly two element children: pane and content");
+        } else if (split) {
+            w->Children().clear();
+            split->SetPane(children[0]);
+            split->SetContent(children[1]);
+        }
+    }
+
+    // ---- <Stack> static active index ----
+    // Apply after child compilation; applying in the factory would run before
+    // the child count is known and SetActiveIndex would reject non-zero pages.
+    if (auto* stack = dynamic_cast<StackWidget*>(w.get())) {
+        for (const auto& a : node.attrs) {
+            if (a.kind != ui::uix::AttrKind::Static || a.name != "active") continue;
+            try { stack->SetActiveIndex(std::stoi(a.rawValue)); } catch (...) {}
+            break;
+        }
+    }
+
     // ---- <ScrollView> post-process ----
     // Children were AddChild'd during recursion. ScrollViewWidget expects a
     // single content widget via SetContent().
diff --git a/src/ui/page/page_state.cpp b/src/ui/page/page_state.cpp
index fe9de8b..62074ca 100644
--- a/src/ui/page/page_state.cpp
+++ b/src/ui/page/page_state.cpp
@@ -618,6 +618,7 @@ void PageState::ApplyBindingToWidget(Widget* w, const std::string& prop, const u
     if (prop == "text") {
         if (auto* lbl = dynamic_cast<LabelWidget*>(w))  lbl->SetText(ToWide(v.ToString()));
         else if (auto* btn = dynamic_cast<ButtonWidget*>(w)) btn->SetText(ToWide(v.ToString()));
+        else if (auto* nav = dynamic_cast<NavItemWidget*>(w)) nav->SetText(ToWide(v.ToString()));
         return;
     }
     if (prop == "id") {
@@ -759,6 +760,32 @@ void PageState::ApplyBindingToWidget(Widget* w, const std::string& prop, const u
                 return;
             }
             painted ? tg->SetOn(b)       : tg->SetOnImmediate(b);
+        } else if (auto* nav = dynamic_cast<NavItemWidget*>(w)) {
+            if (nav->IsSelected() == b) {
+                traceBindingNoop();
+                shouldInvalidate = false;
+                return;
+            }
+            nav->SetSelected(b);
+        }
+        return;
+    }
+    if (prop == "open") {
+        if (auto* split = dynamic_cast<SplitViewWidget*>(w)) {
+            const bool open = v.ToBool();
+            if (split->IsPaneOpen() == open) {
+                traceBindingNoop();
+                shouldInvalidate = false;
+                return;
+            }
+            w->PaintedOnce() ? split->SetPaneOpen(open) : split->SetPaneOpenImmediate(open);
+        }
+        return;
+    }
+    if (prop == "active" || prop == "activeIndex") {
+        if (auto* stack = dynamic_cast<StackWidget*>(w)) {
+            stack->SetActiveIndex(static_cast<int>(v.ToNumber()));
+            ui::RequestLayout();
         }
         return;
     }
diff --git a/src/ui/page/widget_factory.cpp b/src/ui/page/widget_factory.cpp
index d7153f4..8fa11be 100644
--- a/src/ui/page/widget_factory.cpp
+++ b/src/ui/page/widget_factory.cpp
@@ -936,6 +936,30 @@ WidgetPtr ConstructByTag(const std::string& tag, const std::string& text,
     if (tag == "li") {
         return std::make_shared<HBoxWidget>();
     }
+    if (tag == "Stack" || tag == "stack") {
+        return std::make_shared<StackWidget>();
+    }
+    if (tag == "SplitView" || tag == "split-view") {
+        auto split = std::make_shared<SplitViewWidget>();
+        for (const auto& a : node.attrs) {
+            if (a.kind != ui::uix::AttrKind::Static) continue;
+            if (a.name == "mode") {
+                if (a.rawValue == "overlay") split->SetDisplayMode(SplitViewMode::Overlay);
+                else if (a.rawValue == "inline") split->SetDisplayMode(SplitViewMode::Inline);
+                else if (a.rawValue == "compactOverlay") split->SetDisplayMode(SplitViewMode::CompactOverlay);
+                else if (a.rawValue == "compactInline") split->SetDisplayMode(SplitViewMode::CompactInline);
+            } else if (a.name == "openPaneLength" || a.name == "open-pane-length") {
+                const float length = ResolvePx(a.rawValue);
+                if (length > 0.0f) split->SetOpenPaneLength(length);
+            } else if (a.name == "compactPaneLength" || a.name == "compact-pane-length") {
+                const float length = ResolvePx(a.rawValue);
+                if (length >= 0.0f) split->SetCompactPaneLength(length);
+            } else if (a.name == "open" && ParseBoolAttr(a.rawValue)) {
+                split->SetPaneOpenImmediate(true);
+            }
+        }
+        return split;
+    }
 
     // Text widgets
     if (tag == "span" || tag == "a" || tag == "label" || tag == "small" || tag == "strong" || tag == "em") {
@@ -983,6 +1007,24 @@ WidgetPtr ConstructByTag(const std::string& tag, const std::string& text,
         }
         return btn;
     }
+    if (tag == "NavItem" || tag == "nav-item") {
+        std::wstring label = wtext;
+        std::string svg;
+        std::wstring glyph;
+        bool selected = false;
+        for (const auto& a : node.attrs) {
+            if (a.kind != ui::uix::AttrKind::Static) continue;
+            if (a.name == "text") label = ToWide(a.rawValue);
+            else if (a.name == "svg") svg = a.rawValue;
+            else if (a.name == "glyph") glyph = ToWide(a.rawValue);
+            else if (a.name == "selected") selected = ParseBoolAttr(a.rawValue);
+        }
+        auto nav = std::make_shared<NavItemWidget>(label, svg);
+        if (!glyph.empty()) nav->SetGlyph(glyph);
+        nav->SetSelected(selected);
+        nav->cursor = ui::CursorKind::Pointer;
+        return nav;
+    }
     if (tag == "hr") {
         return std::make_shared<SeparatorWidget>();
     }
diff --git a/src/ui/ui_api.cpp b/src/ui/ui_api.cpp
index 8ca2140..edcd31b 100644
--- a/src/ui/ui_api.cpp
+++ b/src/ui/ui_api.cpp
@@ -412,6 +412,10 @@ UI_API UiWidget ui_hbox(void) {
     return Reg(std::make_shared<ui::HBoxWidget>());
 }
 
+UI_API UiWidget ui_stack(void) {
+    return Reg(std::make_shared<ui::StackWidget>());
+}
+
 UI_API UiWidget ui_spacer(float size) {
     return Reg(std::make_shared<ui::SpacerWidget>(size));
 }
@@ -500,6 +504,15 @@ UI_API UiWidget ui_scroll_view(void) {
     return Reg(std::make_shared<ui::ScrollViewWidget>());
 }
 
+UI_API UiWidget ui_nav_item(const wchar_t* text, const char* svg) {
+    return Reg(std::make_shared<ui::NavItemWidget>(
+        text ? text : L"", svg ? svg : ""));
+}
+
+UI_API UiWidget ui_split_view(void) {
+    return Reg(std::make_shared<ui::SplitViewWidget>());
+}
+
 // ================================================================
 // MsgBox (build 158 — 取代 in-window ui_dialog_*)
 // ================================================================
@@ -1867,6 +1880,109 @@ UI_API void ui_tab_set_active(UiWidget tab_control, int index) {
     if (tc) tc->SetActiveIndex(index);
 }
 
+// ================================================================
+// Stack
+// ================================================================
+
+UI_API int ui_stack_get_active_index(UiWidget stack) {
+    auto* sw = As<ui::StackWidget>(stack);
+    return sw ? sw->ActiveIndex() : -1;
+}
+
+UI_API void ui_stack_set_active_index(UiWidget stack, int index) {
+    auto* sw = As<ui::StackWidget>(stack);
+    if (sw) {
+        sw->SetActiveIndex(index);
+        ui::RequestLayout();
+    }
+}
+
+// ================================================================
+// NavItem
+// ================================================================
+
+UI_API int ui_nav_get_selected(UiWidget nav_item) {
+    auto* nav = As<ui::NavItemWidget>(nav_item);
+    return nav && nav->IsSelected() ? 1 : 0;
+}
+
+UI_API void ui_nav_set_selected(UiWidget nav_item, int selected) {
+    auto* nav = As<ui::NavItemWidget>(nav_item);
+    if (nav) {
+        nav->SetSelected(selected != 0);
+        Ctx().InvalidateAllWindows();
+    }
+}
+
+// ================================================================
+// SplitView
+// ================================================================
+
+UI_API void ui_split_set_pane(UiWidget split_view, UiWidget pane) {
+    auto* sv = As<ui::SplitViewWidget>(split_view);
+    auto paneWidget = Ctx().handles.Lookup(pane);
+    if (sv && paneWidget) {
+        sv->SetPane(std::move(paneWidget));
+        ui::RequestLayout();
+    }
+}
+
+UI_API void ui_split_set_content(UiWidget split_view, UiWidget content) {
+    auto* sv = As<ui::SplitViewWidget>(split_view);
+    auto contentWidget = Ctx().handles.Lookup(content);
+    if (sv && contentWidget) {
+        sv->SetContent(std::move(contentWidget));
+        ui::RequestLayout();
+    }
+}
+
+UI_API int ui_split_get_open(UiWidget split_view) {
+    auto* sv = As<ui::SplitViewWidget>(split_view);
+    return sv && sv->IsPaneOpen() ? 1 : 0;
+}
+
+UI_API void ui_split_set_open(UiWidget split_view, int open) {
+    auto* sv = As<ui::SplitViewWidget>(split_view);
+    if (sv) sv->SetPaneOpen(open != 0);
+}
+
+UI_API void ui_split_set_open_immediate(UiWidget split_view, int open) {
+    auto* sv = As<ui::SplitViewWidget>(split_view);
+    if (sv) {
+        sv->SetPaneOpenImmediate(open != 0);
+        ui::RequestLayout();
+    }
+}
+
+UI_API void ui_split_set_mode(UiWidget split_view, UiSplitViewMode mode) {
+    auto* sv = As<ui::SplitViewWidget>(split_view);
+    if (!sv) return;
+    switch (mode) {
+    case UI_SPLIT_VIEW_OVERLAY:         sv->SetDisplayMode(ui::SplitViewMode::Overlay); break;
+    case UI_SPLIT_VIEW_INLINE:          sv->SetDisplayMode(ui::SplitViewMode::Inline); break;
+    case UI_SPLIT_VIEW_COMPACT_OVERLAY: sv->SetDisplayMode(ui::SplitViewMode::CompactOverlay); break;
+    case UI_SPLIT_VIEW_COMPACT_INLINE:  sv->SetDisplayMode(ui::SplitViewMode::CompactInline); break;
+    default: return;
+    }
+    ui::RequestLayout();
+}
+
+UI_API void ui_split_set_open_pane_length(UiWidget split_view, float length) {
+    auto* sv = As<ui::SplitViewWidget>(split_view);
+    if (sv && length > 0.0f) {
+        sv->SetOpenPaneLength(length);
+        ui::RequestLayout();
+    }
+}
+
+UI_API void ui_split_set_compact_pane_length(UiWidget split_view, float length) {
+    auto* sv = As<ui::SplitViewWidget>(split_view);
+    if (sv && length >= 0.0f) {
+        sv->SetCompactPaneLength(length);
+        ui::RequestLayout();
+    }
+}
+
 // ================================================================
 // ScrollView
 // ================================================================