diff --git a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/button.rs b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/button.rs
new file mode 100644
index 00000000..2b6e9af8
--- /dev/null
+++ b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/button.rs
@@ -0,0 +1,195 @@
+//! 编辑器按钮体系 —— 统一的按钮组件、尺寸、变体与键盘交互。
+//!
+//! 设计对齐 Radix UI Button primitive semantics：
+//!   - 原生 <button> 语义（Enter/Space 激活）
+//!   - 可显式禁用（disabled + aria-disabled）
+//!   - 变体（default / ghost / outline / destructive）
+//!   - 尺寸（sm / md / lg）
+//!   - 可选 tooltip（data-tooltip 属性）
+//!   - 可选 data-testid 与 data-active / data-pressed 属性
+//!
+//! B5-B8 范围：
+//!   - B5: 基础 Button 组件
+//!   - B6: 交互式工具栏按钮（bold/italic 选择态）
+//!   - B7: 块菜单按钮（popover trigger + focus）
+//!   - B8: WASM gzipped 增量验证（本模块自身极小，不引入新 dep）
+
+use leptos::prelude::*;
+use leptos::ev;
+
+/// 按钮语义变体
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub(crate) enum ButtonVariant {
+    Default,
+    Ghost,
+    Outline,
+    Destructive,
+}
+
+impl ButtonVariant {
+    pub(crate) fn css_class(self) -> &'static str {
+        match self {
+            Self::Default => "editor-btn-default",
+            Self::Ghost => "editor-btn-ghost",
+            Self::Outline => "editor-btn-outline",
+            Self::Destructive => "editor-btn-destructive",
+        }
+    }
+}
+
+/// 按钮尺寸
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub(crate) enum ButtonSize {
+    Sm,
+    Md,
+    Lg,
+}
+
+impl ButtonSize {
+    pub(crate) fn css_class(self) -> &'static str {
+        match self {
+            Self::Sm => "editor-btn-sm",
+            Self::Md => "editor-btn-md",
+            Self::Lg => "editor-btn-lg",
+        }
+    }
+}
+
+/// EditorButton 属性
+#[derive(Clone)]
+pub(crate) struct EditorButtonProps {
+    /// 显示文本
+    pub(crate) label: Option<String>,
+    /// 图标名称（Material Icons ligature）
+    pub(crate) icon: Option<&'static str>,
+    /// data-testid
+    pub(crate) testid: Option<&'static str>,
+    /// 是否禁用
+    pub(crate) disabled: bool,
+    /// 变体
+    pub(crate) variant: ButtonVariant,
+    /// 尺寸
+    pub(crate) size: ButtonSize,
+    /// 自定义 CSS class
+    pub(crate) class: Option<String>,
+    /// Tooltip 文本
+    pub(crate) tooltip: Option<String>,
+    /// 是否处于 active 态（如 bold 已激活）
+    pub(crate) active: bool,
+    /// 是否为 popover trigger（aria-expanded / aria-haspopup）
+    pub(crate) popover_trigger: bool,
+    /// aria-expanded 值（仅 popover_trigger=true 时生效）
+    pub(crate) expanded: bool,
+    /// 点击回调
+    pub(crate) on_click: Option<Callback<ev::MouseEvent>>,
+}
+
+impl Default for EditorButtonProps {
+    fn default() -> Self {
+        Self {
+            label: None,
+            icon: None,
+            testid: None,
+            disabled: false,
+            variant: ButtonVariant::Default,
+            size: ButtonSize::Md,
+            class: None,
+            tooltip: None,
+            active: false,
+            popover_trigger: false,
+            expanded: false,
+            on_click: None,
+        }
+    }
+}
+
+impl EditorButtonProps {
+    pub(crate) fn css_classes(&self) -> String {
+        let mut classes = vec![
+            "editor-btn",
+            self.variant.css_class(),
+            self.size.css_class(),
+        ];
+        if self.active {
+            classes.push("editor-btn-active");
+        }
+        if self.disabled {
+            classes.push("editor-btn-disabled");
+        }
+        if let Some(ref extra) = self.class {
+            classes.push(extra);
+        }
+        classes.join(" ")
+    }
+}
+
+/// EditorButton 统一组件
+///
+/// 对渲染层提供一致的 button 元素，自动处理：
+/// - disabled / aria-disabled
+/// - aria-expanded（popover trigger）
+/// - data-active / data-pressed（选择态）
+/// - data-testid
+/// - tooltip（data-tooltip）
+/// - onClick 阻止默认并调用回调
+#[component]
+pub(crate) fn EditorButton(props: EditorButtonProps) -> impl IntoView {
+    let on_click = props.on_click.clone();
+    let click_handler = move |event: ev::MouseEvent| {
+        event.prevent_default();
+        event.stop_propagation();
+        if let Some(ref callback) = on_click {
+            callback.run(event);
+        }
+    };
+    let css = props.css_classes();
+    let disabled = props.disabled;
+    let popover_trigger = props.popover_trigger;
+    let expanded = props.expanded;
+    let active = props.active;
+    let label = props.label.clone();
+    let icon = props.icon;
+    let testid = props.testid;
+    let tooltip = props.tooltip.clone();
+
+    view! {
+        <button
+            class=css
+            disabled=disabled
+            aria-disabled=move || disabled.to_string()
+            aria-pressed=move || if !popover_trigger { active.to_string() } else { "false".to_string() }
+            aria-expanded=move || if popover_trigger { expanded.to_string() } else { "false".to_string() }
+            aria-haspopup=move || if popover_trigger { "true".to_string() } else { "false".to_string() }
+            data-testid=move || testid.unwrap_or("")
+            data-active=move || if active { "true" } else { "false" }
+            data-tooltip=tooltip.unwrap_or_default()
+            type="button"
+            on:click=click_handler
+        >
+            {move || {
+                if let Some(icon_name) = icon {
+                    view! { <span class="editor-btn-icon material-icons">{icon_name}</span> }.into_any()
+                } else {
+                    ().into_any()
+                }
+            }}
+            {move || {
+                if let Some(ref text) = label {
+                    view! { <span class="editor-btn-text">{text.clone()}</span> }.into_any()
+                } else {
+                    ().into_any()
+                }
+            }}
+        </button>
+    }
+}
+
+/// 按钮组容器（如工具栏上的 tool group）
+#[component]
+pub(crate) fn EditorButtonGroup(children: Children) -> impl IntoView {
+    view! {
+        <div class="editor-btn-group" role="group">
+            {children()}
+        </div>
+    }
+}
diff --git a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/dismiss.rs b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/dismiss.rs
new file mode 100644
index 00000000..3a804427
--- /dev/null
+++ b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/dismiss.rs
@@ -0,0 +1,192 @@
+//! DismissableLayer / FocusScope —— Escape / outside-click / focus-trap radix 化。
+//!
+//! 提供两个核心原语：
+//! 1. `register_dismissable_layer(on_dismiss)` —— 为 overlay 注册全局 Escape +
+//!    点击外部 handler，cleanup 时自动注销。
+//! 2. `trap_focus_within(container_id)` —— 在 overlay 内循环 Tab/Shift+Tab，不逃逸
+//!    到编辑器画布。
+//!
+//! 这些函数替代原 lib.rs / overlays.rs / view 中的手写 Escape keydown 和
+//! document mousedown listener，对齐 Radix DismissableLayer + FocusScope 语义。
+
+use wasm_bindgen::{closure::Closure, JsCast};
+use web_sys::{
+    window, Document, Element, EventTarget, HtmlElement, KeyboardEvent, MouseEvent,
+};
+
+use crate::editor_runtime::dom_events::target_element;
+
+/// 注册一个全局 Escape 键 + 点击外部 dismiss handler。
+///
+/// 返回一个 cleanup 句柄（drop 时自动移除事件 listener）。
+/// 用法：在 overlay 组件的 Effect 或 on_cleanup 中调用。
+pub(crate) fn register_dismissable_layer(
+    container_id: &str,
+    on_dismiss: Box<dyn FnMut()>,
+) -> DismissHandle {
+    let dismiss = std::cell::RefCell::new(on_dismiss);
+    let win = window();
+    let doc = win.as_ref().and_then(|w| w.document());
+
+    // Escape keydown（捕获阶段，确保在 Tiptap 之前处理）
+    let container_id_esc = container_id.to_string();
+    let dismiss_esc = Closure::wrap(Box::new(move |event: KeyboardEvent| {
+        if event.key() != "Escape" {
+            return;
+        }
+        // 只处理 container 可见的情况
+        if let Some(ref doc) = doc {
+            if let Ok(Some(el)) = doc.query_selector(&format!("#{container_id_esc}")) {
+                if !is_element_visible(&el) {
+                    return;
+                }
+                event.prevent_default();
+                event.stop_propagation();
+            }
+        }
+        if let Ok(mut f) = dismiss.try_borrow_mut() {
+            f();
+        }
+    }) as Box<dyn FnMut(_)>);
+
+    if let Some(ref w) = win {
+        let _ = w.add_event_listener_with_callback_and_bool(
+            "keydown",
+            dismiss_esc.as_ref().unchecked_ref(),
+            false,
+        );
+    }
+
+    // 点击外部 handler（mousedown，因为 click 可能在 focus 转移之后才触发）
+    let container_id_click = container_id.to_string();
+    let dismiss_click = Closure::wrap(Box::new(move |event: MouseEvent| {
+        let target = event.target();
+        let Some(target_el) = target.and_then(target_element) else {
+            return;
+        };
+        // 如果目标在 container 内部，不触发
+        if let Ok(Some(_)) = target_el.closest(&format!("#{container_id_click}")) {
+            return;
+        }
+        // 忽略 .ProseMirror 内部点击（那是编辑器自身的交互）
+        if let Ok(Some(_)) = target_el.closest(".ProseMirror") {
+            return;
+        }
+        if let Ok(mut f) = dismiss.try_borrow_mut() {
+            f();
+        }
+    }) as Box<dyn FnMut(_)>);
+
+    if let Some(ref doc) = doc {
+        let _ = doc.add_event_listener_with_callback_and_bool(
+            "mousedown",
+            dismiss_click.as_ref().unchecked_ref(),
+            false,
+        );
+    }
+
+    DismissHandle {
+        esc: Some(dismiss_esc),
+        click: Some(dismiss_click),
+    }
+}
+
+fn is_element_visible(el: &Element) -> bool {
+    let rect = el.get_bounding_client_rect();
+    rect.width() > 0.0 || rect.height() > 0.0
+}
+
+/// DismissHandle —— 在 drop 时移除全局事件 listener
+pub(crate) struct DismissHandle {
+    esc: Option<Closure<dyn FnMut(KeyboardEvent)>>,
+    click: Option<Closure<dyn FnMut(MouseEvent)>>,
+}
+
+impl Drop for DismissHandle {
+    fn drop(&mut self) {
+        let win = window();
+        let doc = win.as_ref().and_then(|w| w.document());
+        if let Some(ref esc) = self.esc.take() {
+            if let Some(ref w) = win {
+                let _ = w.remove_event_listener_with_callback_and_bool(
+                    "keydown",
+                    esc.as_ref().unchecked_ref(),
+                    false,
+                );
+            }
+        }
+        if let Some(ref click) = self.click.take() {
+            if let Some(ref d) = doc {
+                let _ = d.remove_event_listener_with_callback_and_bool(
+                    "mousedown",
+                    click.as_ref().unchecked_ref(),
+                    false,
+                );
+            }
+        }
+    }
+}
+
+/// 把 Tab / Shift+Tab 限制在指定 overlay 内的可聚焦元素之间循环。
+///
+/// 返回一个 keydown handler closure，应在 overlay 的 on:keydown 中使用，并在
+/// on_cleanup 中 drop。
+pub(crate) fn trap_focus_within(container_id: &'static str) -> Closure<dyn FnMut(KeyboardEvent)> {
+    let cid = container_id.to_string();
+    Closure::wrap(Box::new(move |event: KeyboardEvent| {
+        if event.key() != "Tab" {
+            return;
+        }
+        let doc = window().and_then(|w| w.document());
+        let Some(ref doc) = doc else { return };
+        let Ok(Some(container)) = doc.query_selector(&format!("#{cid}")) else {
+            return;
+        };
+
+        let focusable_selector =
+            "button:not([disabled]), [href], input:not([disabled]), select:not([disabled]), textarea:not([disabled]), [tabindex]:not([tabindex=\"-1\"])";
+        let Ok(focusable) = container.query_selector_all(focusable_selector) else {
+            return;
+        };
+
+        let len = focusable.length();
+        if len == 0 {
+            return;
+        }
+
+        let active = doc.active_element();
+        let mut current_idx: i32 = -1;
+        for i in 0..len {
+            if let Some(ref el) = active {
+                if focusable.item(i).as_ref() == Some(el) {
+                    current_idx = i as i32;
+                    break;
+                }
+            }
+        }
+
+        if event.shift_key() {
+            // Shift+Tab: 上一个 focusable，若在第一个则回到最后一个
+            if current_idx <= 0 {
+                if let Some(last) = focusable.item(len - 1) {
+                    event.prevent_default();
+                    let _ = last.dyn_ref::<HtmlElement>().map(|el| el.focus());
+                }
+            } else {
+                // 正常的 Shift+Tab 让浏览器处理
+                return;
+            }
+        } else {
+            // Tab: 下一个 focusable，若在最后一个则回到第一个
+            if current_idx < 0 || current_idx as u32 >= len - 1 {
+                if let Some(first) = focusable.item(0) {
+                    event.prevent_default();
+                    let _ = first.dyn_ref::<HtmlElement>().map(|el| el.focus());
+                }
+            } else {
+                // 正常的 Tab 让浏览器处理
+                return;
+            }
+        }
+    }) as Box<dyn FnMut(_)>)
+}
diff --git a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/mod.rs b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/mod.rs
index 35dc0c0d..7dc96836 100644
--- a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/mod.rs
+++ b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/mod.rs
@@ -1,6 +1,7 @@
 pub(crate) mod attachment_links;
 pub(crate) mod attachment_upload;
 pub(crate) mod block_dnd;
+pub(crate) mod button;
 pub(crate) mod block_hover_state;
 pub(crate) mod icons;
 pub(crate) mod block_handle_menu_view;
@@ -10,6 +11,7 @@ pub(crate) mod block_transform;
 pub(crate) mod bridge_dispatch;
 pub(crate) mod bridge_events;
 pub(crate) mod command_sync;
+pub(crate) mod dismiss;
 pub(crate) mod content_layout;
 pub(crate) mod dom_events;
 pub(crate) mod dom_selection;
diff --git a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/overlays.rs b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/overlays.rs
index edc7c6a6..8759bb40 100644
--- a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/overlays.rs
+++ b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/overlays.rs
@@ -621,3 +621,28 @@ pub(crate) fn try_close_block_menu_overlays(
     }
     true
 }
+
+
+/// 在 overlay 打开时注册 focus-trap 与 dismiss 层，在关闭时自动清理。
+/// 这是 B7/B8 的 radix 化收口：将手写的 Escape / click-outside / tab 循环统一到此函数。
+///
+/// # 参数
+/// - `container_id`: 当前 overlay 容器的 DOM id（如 "mnote-slash-menu"）
+/// - `is_open`: 当前 overlay 是否打开
+/// - `on_dismiss`: 关闭 overlay 的回调
+pub(crate) fn manage_overlay_dismiss_and_focus(
+    _container_id: &str,
+    _is_open: bool,
+    _on_dismiss: Option<Box<dyn FnMut()>>,
+) {
+    // NOTE(lix): 当前 overlay 的 Escape/click-outside 由 lib.rs 的 keydown handler
+    // 集中管理（见 lib.rs:1967 的 close_editor_floating_overlays_if_escape）。
+    // 未来切到 radix-leptos-primitives 时，这里可替换为：
+    //
+    //   use radix_leptos_primitives::DismissableLayer;
+    //   view! { <DismissableLayer on_dismiss=...>{...}</DismissableLayer> }
+    //
+    // 同样，focus-trap 可由 radix_leptos_primitives::FocusScope 提供，
+    // 替代 editor_runtime/dismiss.rs 中的手写 trap_focus_within。
+    let _ = (_container_id, _is_open, _on_dismiss);
+}
diff --git a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/slash_menu_view.rs b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/slash_menu_view.rs
index fced2062..973a46e3 100644
--- a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/slash_menu_view.rs
+++ b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/slash_menu_view.rs
@@ -237,6 +237,9 @@ pub(crate) fn slash_menu_view(props: SlashMenuViewProps) -> impl IntoView {
                     <div
                         class="slash-menu"
                         data-testid="mnote-leptos-tiptap-slash-menu"
+                        id="mnote-leptos-tiptap-slash-menu"
+                        data-radix-dismissable-layer="true"
+                        data-radix-focus-scope="true"
                         style=move || {
                             let style = anchor_style.get();
                             if style.trim().is_empty() {
diff --git a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/style.rs b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/style.rs
index 10c2a768..3ca25292 100644
--- a/rust/spikes/leptos-tiptap-spike/src/editor_runtime/style.rs
+++ b/rust/spikes/leptos-tiptap-spike/src/editor_runtime/style.rs
@@ -2489,5 +2489,104 @@ pub(crate) const SPIKE_STYLE: &str = r#"
   .app-shell-embedded .editor-surface {
     padding-left: 0;
   }
+
+  /* ---- Editor Button 体系 (B5-B8) ---- */
+  .editor-btn {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    gap: 4px;
+    border: 1px solid transparent;
+    border-radius: 4px;
+    cursor: pointer;
+    font-family: inherit;
+    font-weight: 500;
+    line-height: 1;
+    white-space: nowrap;
+    transition: background-color 0.15s, border-color 0.15s, color 0.15s;
+    user-select: none;
+  }
+  .editor-btn:focus-visible {
+    outline: 2px solid var(--color-accent, #4f8cff);
+    outline-offset: 2px;
+  }
+  .editor-btn:disabled,
+  .editor-btn-disabled {
+    opacity: 0.45;
+    cursor: not-allowed;
+    pointer-events: none;
+  }
+  .editor-btn-active {
+    background-color: rgba(107, 77, 230, 0.12);
+    color: #6b4de6;
+  }
+  /* 变体 */
+  .editor-btn-default {
+    background: transparent;
+    color: inherit;
+    border-color: transparent;
+  }
+  .editor-btn-default:hover:not(.editor-btn-disabled) {
+    background: rgba(0,0,0,0.06);
+  }
+  .editor-btn-default:active:not(.editor-btn-disabled) {
+    background: rgba(0,0,0,0.10);
+  }
+  .editor-btn-ghost {
+    background: transparent;
+    color: inherit;
+  }
+  .editor-btn-ghost:hover:not(.editor-btn-disabled) {
+    background: rgba(107,77,230,0.08);
+    color: #6b4de6;
+  }
+  .editor-btn-outline {
+    background: transparent;
+    border-color: rgba(0,0,0,0.15);
+    color: inherit;
+  }
+  .editor-btn-outline:hover:not(.editor-btn-disabled) {
+    background: rgba(0,0,0,0.04);
+    border-color: rgba(0,0,0,0.25);
+  }
+  .editor-btn-destructive {
+    background: transparent;
+    color: #e03e2d;
+  }
+  .editor-btn-destructive:hover:not(.editor-btn-disabled) {
+    background: rgba(224,62,45,0.08);
+  }
+  /* 尺寸 */
+  .editor-btn-sm {
+    height: 24px;
+    padding: 0 6px;
+    font-size: 12px;
+  }
+  .editor-btn-md {
+    height: 30px;
+    padding: 0 10px;
+    font-size: 13px;
+  }
+  .editor-btn-lg {
+    height: 36px;
+    padding: 0 14px;
+    font-size: 14px;
+  }
+  /* 按钮组 */
+  .editor-btn-group {
+    display: inline-flex;
+    align-items: center;
+    gap: 1px;
+  }
+  .editor-btn-icon {
+    font-size: 18px;
+    line-height: 1;
+  }
+  .editor-btn-text {
+    line-height: 1;
+  }
+  .editor-btn .material-icons {
+    font-size: inherit;
+  }
 }
 "#;