diff --git a/UI-DESIGN.md b/UI-DESIGN.md
index b07afdff..4945c96f 100644
--- a/UI-DESIGN.md
+++ b/UI-DESIGN.md
@@ -336,6 +336,8 @@
 - 当前工作栏 Tab 必须同时使用连续内容表面、可见边框、顶部指示、图标或较高字重中的至少
   两种信号；悬停反馈不得强于当前选中态。Tab 关闭按钮保留固定布局空间，默认仅在对应 Tab 悬停或
   `focus-within` 时显示；无悬停或粗指针设备始终显示，键盘与辅助技术始终可访问。
+- 工作栏 Tab、Tab 关闭按钮、“+”入口、终端面板外框及终端顶部工具栏按钮统一使用直角，
+  形成连续、紧凑的停靠式工具界面，不沿用普通卡片和表单控件的圆角。
 - 选择“终端”后直接绑定当前项目，由项目执行空间自动决定本机或托管 SSH；不再显示第二层
   目标选择器。终端面板内部不重复提供关闭会话按钮，关闭统一由 Tab 入口完成。
 - 下一次请求使用的附件和知识库由会话输入区展示与管理，不在工作栏重复提供“上下文”栏目；
diff --git a/docs/features/assistant-workbar/terminal-tabs-prd.md b/docs/features/assistant-workbar/terminal-tabs-prd.md
index 25951615..ca2b78fc 100644
--- a/docs/features/assistant-workbar/terminal-tabs-prd.md
+++ b/docs/features/assistant-workbar/terminal-tabs-prd.md
@@ -147,6 +147,8 @@ stdio fallback。首期远程终端随 SSH Channel 结束，不提供跨 SSH 或
 - 终端 Tab 默认使用递增标题，例如“终端 1”“终端 2”；状态栏持续显示项目、Host、
   工作目录和 Shell。用户可以重命名终端。
 - 当前 Tab 同时使用连续内容表面、选中边框、顶部强调线、图标和较高字重，不能只靠文字颜色。
+- Tab、关闭按钮、“+”入口、终端面板外框和终端顶部工具栏按钮使用直角，保持停靠式工具界面
+  的连续边界，不使用卡片式圆角。
 - Tab 关闭按钮默认不争夺视觉注意力，仅在鼠标悬停或键盘焦点进入对应 Tab 时出现；
   粗指针或无悬停设备始终显示，出现与隐藏不得引发布局位移。
 
@@ -237,7 +239,8 @@ stdio fallback。首期远程终端随 SSH Channel 结束，不提供跨 SSH 或
 
 - 真实 TTY 输入与 ANSI 输出。
 - 中文输入法、组合字符和常规键盘快捷键。
-- 复制、粘贴、全选、搜索、清屏和滚动。
+- 复制、粘贴、全选、搜索、清屏和滚动。复制与粘贴通过桌面 Main 进程访问系统文本剪贴板，
+  不依赖 Renderer 的浏览器剪贴板权限。
 - 工作栏宽度或窗口尺寸变化后的 PTY resize。
 - 终端重命名。
 - 显式关闭、退出后重新打开和远程中断后重新连接。
diff --git a/src/main/ipc.test.ts b/src/main/ipc.test.ts
index dd866192..fa0fa230 100644
--- a/src/main/ipc.test.ts
+++ b/src/main/ipc.test.ts
@@ -242,6 +242,11 @@ describe('terminal IPC boundary', () => {
       snapshot.sessionId
     )
 
+    expect(
+      electronMocks.handlers.get(ipcChannels.clipboardReadText)?.(event)
+    ).toBe('Get-Location\r')
+    expect(electronMocks.readClipboardText).toHaveBeenCalledOnce()
+
     electronMocks.handlers.get(ipcChannels.clipboardWriteText)?.(
       event,
       '## Copied response'
@@ -249,6 +254,12 @@ describe('terminal IPC boundary', () => {
     expect(electronMocks.writeClipboardText).toHaveBeenCalledWith(
       '## Copied response'
     )
+    expect(() =>
+      electronMocks.handlers.get(ipcChannels.clipboardReadText)?.({
+        sender: { ...webContents, id: 99 },
+        senderFrame: webContents.mainFrame
+      })
+    ).toThrow('拒绝来自未知窗口的 IPC 请求')
     expect(() =>
       electronMocks.handlers.get(ipcChannels.clipboardWriteText)?.(
         event,
@@ -319,6 +330,7 @@ const electronMocks = vi.hoisted(() => {
     openPath: vi.fn(async () => ''),
     showItemInFolder: vi.fn(),
     openExternal: vi.fn(async () => undefined),
+    readClipboardText: vi.fn(() => 'Get-Location\r'),
     writeClipboardText: vi.fn()
   }
 })
@@ -1131,6 +1143,7 @@ vi.mock('electron', () => ({
   },
   BrowserWindow: class {},
   clipboard: {
+    readText: electronMocks.readClipboardText,
     writeText: electronMocks.writeClipboardText
   },
   dialog: {
diff --git a/src/main/ipc.ts b/src/main/ipc.ts
index 11e039a6..b8c8abd7 100644
--- a/src/main/ipc.ts
+++ b/src/main/ipc.ts
@@ -3300,6 +3300,11 @@ export function registerIpcHandlers(
     }
   })
 
+  registerHandler(ipcChannels.clipboardReadText, (event) => {
+    assertTrustedSender(event, window)
+    return clipboardTextSchema.parse(clipboard.readText())
+  })
+
   registerHandler(ipcChannels.clipboardWriteText, (event, input) => {
     assertTrustedSender(event, window)
     clipboard.writeText(clipboardTextSchema.parse(input))
diff --git a/src/preload/index.ts b/src/preload/index.ts
index 8034ddc7..81cfc5b8 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -255,6 +255,8 @@ const desktopApi: DesktopApi = {
     }
   },
   clipboard: {
+    readText: () =>
+      ipcRenderer.invoke(ipcChannels.clipboardReadText) as Promise<string>,
     writeText: async (text: string) => {
       await ipcRenderer.invoke(ipcChannels.clipboardWriteText, text)
     }
diff --git a/src/preload/preload-sandbox.test.ts b/src/preload/preload-sandbox.test.ts
index 23d2f1b9..60e7ec12 100644
--- a/src/preload/preload-sandbox.test.ts
+++ b/src/preload/preload-sandbox.test.ts
@@ -21,7 +21,7 @@ describe('sandboxed preload', () => {
     expect(source).not.toMatch(/\bfrom\s+['"]zod['"]/u)
   })
 
-  it('exposes only explicit clipboard text writing', () => {
+  it('exposes only explicit clipboard text reading and writing', () => {
     const source = readFileSync(
       join(process.cwd(), 'src', 'preload', 'index.ts'),
       'utf8'
@@ -30,9 +30,11 @@ describe('sandboxed preload', () => {
       source.match(
         /clipboard: \{(?<body>[\s\S]*?)\r?\n {2}\},\r?\n {2}agent:/u
       )?.groups?.body ?? ''
+    expect(clipboard).toContain('readText: ()')
+    expect(clipboard).toContain('ipcChannels.clipboardReadText')
     expect(clipboard).toContain('writeText: async (text: string)')
     expect(clipboard).toContain('ipcChannels.clipboardWriteText')
-    expect(clipboard).not.toMatch(/\b(?:read|image|html|rtf|bookmark)\b/iu)
+    expect(clipboard).not.toMatch(/\b(?:image|html|rtf|bookmark)\b/iu)
   })
 
   it('exposes only narrow browser-control methods', () => {
diff --git a/src/renderer/src/App.test.tsx b/src/renderer/src/App.test.tsx
index d5fa1798..532e29c5 100644
--- a/src/renderer/src/App.test.tsx
+++ b/src/renderer/src/App.test.tsx
@@ -216,6 +216,7 @@ const api: DesktopApi = {
     onOpenSettings: vi.fn(() => () => {})
   },
   clipboard: {
+    readText: vi.fn(async () => ''),
     writeText: vi.fn(async () => {})
   },
   feedback: {
diff --git a/src/renderer/src/TerminalPanel.test.tsx b/src/renderer/src/TerminalPanel.test.tsx
index 977699ec..ef77ea77 100644
--- a/src/renderer/src/TerminalPanel.test.tsx
+++ b/src/renderer/src/TerminalPanel.test.tsx
@@ -1,4 +1,6 @@
 import { cleanup, fireEvent, render, screen, waitFor } from '@testing-library/react'
+import { readFileSync } from 'node:fs'
+import { join } from 'node:path'
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import type {
   TerminalEvent,
@@ -8,6 +10,7 @@ import {
   TerminalPanel,
   resolveTerminalFontFamily,
   type TerminalAdapter,
+  type TerminalClipboardAdapter,
   type TerminalEmulator,
   type TerminalFactory
 } from './TerminalPanel'
@@ -19,6 +22,16 @@ vi.mock('@xterm/addon-search', () => ({
 }))
 
 const sessionId = '00000000-0000-4000-8000-000000000201'
+const terminalStylesheet = readFileSync(
+  join(
+    process.cwd(),
+    'src',
+    'renderer',
+    'src',
+    'terminal-panel.css'
+  ),
+  'utf8'
+)
 
 function snapshot(
   overrides: Partial<TerminalSnapshot> = {}
@@ -156,6 +169,50 @@ afterEach(() => {
 })
 
 describe('TerminalPanel', () => {
+  it('uses the Main-process clipboard bridge for copy and paste', async () => {
+    const backend = adapterHarness()
+    const emulator = emulatorHarness()
+    const clipboardAdapter: TerminalClipboardAdapter = {
+      readText: vi.fn(async () => 'Get-Location\r'),
+      writeText: vi.fn(async () => undefined)
+    }
+    render(
+      <TerminalPanel
+        adapter={backend.adapter}
+        clipboardAdapter={clipboardAdapter}
+        sessionId={sessionId}
+        target={{ type: 'local' }}
+        terminalFactory={emulator.factory}
+      />
+    )
+    await screen.findByText('PowerShell 7')
+
+    fireEvent.click(screen.getByRole('button', { name: '复制选中内容' }))
+    await waitFor(() =>
+      expect(clipboardAdapter.writeText).toHaveBeenCalledWith(
+        'selected output'
+      )
+    )
+
+    fireEvent.click(screen.getByRole('button', { name: '粘贴' }))
+    await waitFor(() =>
+      expect(backend.adapter.write).toHaveBeenCalledWith({
+        sessionId,
+        data: 'Get-Location\r'
+      })
+    )
+    expect(clipboardAdapter.readText).toHaveBeenCalledOnce()
+  })
+
+  it('keeps the terminal panel and toolbar controls square', () => {
+    expect(terminalStylesheet).toMatch(
+      /\.terminal-panel\s*\{[^}]*border-radius:\s*0;/u
+    )
+    expect(terminalStylesheet).toMatch(
+      /\.terminal-panel__toolbar button\s*\{[^}]*border-radius:\s*0;/u
+    )
+  })
+
   it('creates only after the first valid fitted size and forwards input', async () => {
     const backend = adapterHarness()
     const emulator = emulatorHarness()
diff --git a/src/renderer/src/TerminalPanel.tsx b/src/renderer/src/TerminalPanel.tsx
index 5d78fb63..63b43982 100644
--- a/src/renderer/src/TerminalPanel.tsx
+++ b/src/renderer/src/TerminalPanel.tsx
@@ -33,6 +33,8 @@ export type TerminalAdapter = Omit<DesktopApi['terminal'], 'onEvent'> & {
   subscribe: DesktopApi['terminal']['onEvent']
 }
 
+export type TerminalClipboardAdapter = DesktopApi['clipboard']
+
 type Disposable = { dispose: () => void }
 
 export type TerminalEmulator = {
@@ -67,6 +69,7 @@ export type TerminalFactory = () => TerminalFactoryResult
 
 export type TerminalPanelProps = {
   adapter: TerminalAdapter
+  clipboardAdapter?: TerminalClipboardAdapter
   target: TerminalTarget
   sessionId?: TerminalSessionId
   title?: string
@@ -149,6 +152,7 @@ function isValidSize(
 
 export function TerminalPanel({
   adapter,
+  clipboardAdapter,
   target,
   sessionId,
   title,
@@ -484,7 +488,7 @@ export function TerminalPanel({
       return
     }
     try {
-      await navigator.clipboard.writeText(value)
+      await (clipboardAdapter ?? window.goodbuddy.clipboard).writeText(value)
     } catch (reason) {
       setError(
         failureMessage(
@@ -501,7 +505,9 @@ export function TerminalPanel({
       return
     }
     try {
-      const data = await navigator.clipboard.readText()
+      const data = await (
+        clipboardAdapter ?? window.goodbuddy.clipboard
+      ).readText()
       if (data) {
         await adapter.write({ sessionId: current.sessionId, data })
       }
diff --git a/src/renderer/src/WorkbarShell.test.tsx b/src/renderer/src/WorkbarShell.test.tsx
index c0719dfe..53d062eb 100644
--- a/src/renderer/src/WorkbarShell.test.tsx
+++ b/src/renderer/src/WorkbarShell.test.tsx
@@ -6,6 +6,8 @@ import {
   waitFor,
   within
 } from '@testing-library/react'
+import { readFileSync } from 'node:fs'
+import { join } from 'node:path'
 import {
   useState,
   type ReactNode
@@ -29,6 +31,10 @@ const terminalOne: WorkbarTabInstance = {
   title: '终端 · 本机 1',
   targetRef: { type: 'local' }
 }
+const stylesheet = readFileSync(
+  join(process.cwd(), 'src', 'renderer', 'src', 'styles.css'),
+  'utf8'
+)
 
 function ControlledShell({
   initialInstances = DEFAULT_WORKBAR_INSTANCES,
@@ -66,6 +72,15 @@ function ControlledShell({
 }
 
 describe('WorkbarShell', () => {
+  it('keeps tabs and their controls square', () => {
+    expect(stylesheet).toMatch(
+      /\.workbar-shell__tab-item\s*\{[^}]*border-radius:\s*0;/u
+    )
+    expect(stylesheet).toMatch(
+      /\.workbar-shell__tab-close,\s*\n\.workbar-shell__add\s*\{[^}]*border-radius:\s*0;/u
+    )
+  })
+
   it('provides four default single-instance tabs and keeps add outside the tablist', () => {
     render(<ControlledShell />)
 
diff --git a/src/renderer/src/styles.css b/src/renderer/src/styles.css
index f9e1a6e8..9ee1cf95 100644
--- a/src/renderer/src/styles.css
+++ b/src/renderer/src/styles.css
@@ -3858,7 +3858,7 @@ button > svg {
   align-items: center;
   border: 1px solid transparent;
   border-bottom: 0;
-  border-radius: var(--radius-control) var(--radius-control) 0 0;
+  border-radius: 0;
   background: transparent;
   transition:
     border-color var(--motion-fast) ease-out,
@@ -3936,7 +3936,7 @@ button > svg {
   height: 28px;
   padding: 0;
   place-items: center;
-  border-radius: var(--radius-control);
+  border-radius: 0;
   background: transparent;
   color: var(--text-muted);
   cursor: pointer;
diff --git a/src/renderer/src/terminal-panel.css b/src/renderer/src/terminal-panel.css
index ac25db50..e47cb344 100644
--- a/src/renderer/src/terminal-panel.css
+++ b/src/renderer/src/terminal-panel.css
@@ -8,7 +8,7 @@
   color: var(--text-primary);
   background: var(--surface-raised);
   border: 1px solid var(--border-default);
-  border-radius: var(--radius-card);
+  border-radius: 0;
 }
 
 .terminal-panel--loading {
@@ -47,6 +47,10 @@
   cursor: pointer;
 }
 
+.terminal-panel__toolbar button {
+  border-radius: 0;
+}
+
 .terminal-panel__toolbar button:hover:not(:disabled),
 .terminal-panel__inline-form button:hover:not(:disabled),
 .terminal-panel__error button:hover:not(:disabled) {
diff --git a/src/shared/contracts.ts b/src/shared/contracts.ts
index 06c2733f..84556929 100644
--- a/src/shared/contracts.ts
+++ b/src/shared/contracts.ts
@@ -1564,6 +1564,7 @@ export type DesktopApi = {
     onOpenSettings: (listener: () => void) => () => void
   }
   clipboard: {
+    readText: () => Promise<string>
     writeText: (text: string) => Promise<void>
   }
   agent: {
diff --git a/src/shared/ipc-channels.ts b/src/shared/ipc-channels.ts
index f03a10e0..54d095d2 100644
--- a/src/shared/ipc-channels.ts
+++ b/src/shared/ipc-channels.ts
@@ -11,6 +11,7 @@ export const ipcChannels = {
   appRendererPersistenceRequest: 'app:renderer-persistence-request',
   appRendererPersistenceComplete: 'app:renderer-persistence-complete',
   appClearLocalData: 'app:clear-local-data',
+  clipboardReadText: 'clipboard:read-text',
   clipboardWriteText: 'clipboard:write-text',
   conversationNew: 'conversation:new',
   settingsOpen: 'settings:open',