diff --git a/docs/audit/2026-06-08-webssh-classic-terminal-theme.md b/docs/audit/2026-06-08-webssh-classic-terminal-theme.md
new file mode 100644
index 00000000..5285d7ef
--- /dev/null
+++ b/docs/audit/2026-06-08-webssh-classic-terminal-theme.md
@@ -0,0 +1,31 @@
+# 审计 — WebSSH 黑底白字 ANSI 主题（2026-06-08）
+
+**Changelog**: `docs/changelog/2026-06-08-webssh-classic-terminal-theme.md`
+
+## 审计范围
+
+| 模块 | 文件 |
+|------|------|
+| 主题 | `frontend/src/composables/terminal/xtermTheme.ts` |
+| 会话 | `frontend/src/composables/terminal/useTerminalSessions.ts` |
+| 页面 | `frontend/src/pages/TerminalPage.vue` |
+| 区域 | `frontend/src/components/terminal/TerminalArea.vue` |
+
+## Step 3
+
+| H | 规则 | 结论 |
+|---|------|------|
+| H1 | 固定黑底白字 | PASS — 不随 Vuetify 浅色切换 |
+| H2 | ANSI 16 色 | PASS — drawBoldTextInBrightColors |
+| H3 | 无后端变更 | PASS — 纯前端 |
+
+## Closure
+
+| H | 判定 |
+|---|------|
+| H1–H3 | PASS |
+
+## DoD
+
+- [x] frontend vite build
+- [x] changelog
diff --git a/docs/changelog/2026-06-08-webssh-classic-terminal-theme.md b/docs/changelog/2026-06-08-webssh-classic-terminal-theme.md
new file mode 100644
index 00000000..d07b8fe2
--- /dev/null
+++ b/docs/changelog/2026-06-08-webssh-classic-terminal-theme.md
@@ -0,0 +1,24 @@
+# 2026-06-08 — WebSSH 终端固定黑底白字 ANSI 配色
+
+## 摘要
+
+WebSSH xterm 不再跟随 Vuetify 浅色主题，固定经典黑底白字 + 16 色 ANSI。
+
+## 动机
+
+浅色模式下终端呈白底深字，不符合 SSH 终端习惯；用户要求黑底白字带字符颜色。
+
+## 涉及文件
+
+- `frontend/src/composables/terminal/xtermTheme.ts`（新增）
+- `frontend/src/composables/terminal/useTerminalSessions.ts`
+- `frontend/src/pages/TerminalPage.vue`
+- `frontend/src/components/terminal/TerminalArea.vue`
+
+## 验证
+
+```bash
+cd frontend && npm run build
+```
+
+浏览器：终端页连接 SSH，`ls --color=auto`、`grep --color` 等应显示彩色输出。
diff --git a/frontend/src/components/terminal/TerminalArea.vue b/frontend/src/components/terminal/TerminalArea.vue
index 4c17c828..df106a46 100644
--- a/frontend/src/components/terminal/TerminalArea.vue
+++ b/frontend/src/components/terminal/TerminalArea.vue
@@ -92,6 +92,7 @@ defineExpose({ containerRef })
   position: relative;
   min-height: 0;
   overflow: hidden;
+  background: #000000;
 }
 .terminal-area__overlay {
   z-index: 4;
diff --git a/frontend/src/composables/terminal/useTerminalSessions.ts b/frontend/src/composables/terminal/useTerminalSessions.ts
index 73b0dffe..7b373a63 100644
--- a/frontend/src/composables/terminal/useTerminalSessions.ts
+++ b/frontend/src/composables/terminal/useTerminalSessions.ts
@@ -1,6 +1,5 @@
 import { ref, computed, watch, nextTick, type Ref } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
-import { useTheme } from 'vuetify'
 import { Terminal } from '@xterm/xterm'
 import { FitAddon } from '@xterm/addon-fit'
 import { WebLinksAddon } from '@xterm/addon-web-links'
@@ -25,13 +24,13 @@ import {
 } from './types'
 import { useTerminalSettings } from './useTerminalSettings'
 import { useTerminalCmdBar } from './useTerminalCmdBar'
+import { XTERM_CLASSIC_THEME } from './xtermTheme'
 
 const MAX_TABS = 10
 
 export function useTerminalSessions(nexusDrawer: Ref<boolean>) {
   const route = useRoute()
   const router = useRouter()
-  const theme = useTheme()
   const snackbar = useSnackbar()
   const settings = useTerminalSettings()
 
@@ -120,58 +119,13 @@ export function useTerminalSessions(nexusDrawer: Ref<boolean>) {
   }
 
   function createTerminal(): Terminal {
-    const isDark = theme.global.current.value.dark
     return new Terminal({
       cursorBlink: true,
       cursorStyle: 'bar',
       fontSize: settings.fontSize.value,
       scrollback: settings.scrollback.value,
       fontFamily: '"Cascadia Code","Fira Code","JetBrains Mono",Menlo,monospace',
-      theme: isDark
-        ? {
-            background: '#0b1120',
-            foreground: '#e2e8f0',
-            cursor: '#7c8bf4',
-            selectionBackground: '#334155',
-            black: '#1e293b',
-            red: '#f87171',
-            green: '#4ade80',
-            yellow: '#fbbf24',
-            blue: '#60a5fa',
-            magenta: '#c084fc',
-            cyan: '#22d3ee',
-            white: '#e2e8f0',
-            brightBlack: '#64748b',
-            brightRed: '#fca5a5',
-            brightGreen: '#86efac',
-            brightYellow: '#fde047',
-            brightBlue: '#93c5fd',
-            brightMagenta: '#d8b4fe',
-            brightCyan: '#67e8f9',
-            brightWhite: '#f8fafc',
-          }
-        : {
-            background: '#f8fafc',
-            foreground: '#0f172a',
-            cursor: '#4f46e5',
-            selectionBackground: '#bfdbfe',
-            black: '#1e293b',
-            red: '#dc2626',
-            green: '#16a34a',
-            yellow: '#ca8a04',
-            blue: '#2563eb',
-            magenta: '#9333ea',
-            cyan: '#0891b2',
-            white: '#f1f5f9',
-            brightBlack: '#64748b',
-            brightRed: '#ef4444',
-            brightGreen: '#22c55e',
-            brightYellow: '#eab308',
-            brightBlue: '#3b82f6',
-            brightMagenta: '#a855f7',
-            brightCyan: '#06b6d4',
-            brightWhite: '#ffffff',
-          },
+      theme: XTERM_CLASSIC_THEME,
       allowProposedApi: true,
       drawBoldTextInBrightColors: true,
     })
diff --git a/frontend/src/composables/terminal/xtermTheme.ts b/frontend/src/composables/terminal/xtermTheme.ts
new file mode 100644
index 00000000..46ac1c1a
--- /dev/null
+++ b/frontend/src/composables/terminal/xtermTheme.ts
@@ -0,0 +1,27 @@
+import type { ITheme } from '@xterm/xterm'
+
+/** 经典终端：黑底白字 + 16 色 ANSI（不随 Vuetify 浅色/深色切换） */
+export const XTERM_CLASSIC_THEME: ITheme = {
+  background: '#000000',
+  foreground: '#ffffff',
+  cursor: '#ffffff',
+  cursorAccent: '#000000',
+  selectionBackground: '#4d4d4d',
+  selectionForeground: '#ffffff',
+  black: '#000000',
+  red: '#cd3131',
+  green: '#0dbc79',
+  yellow: '#e5e510',
+  blue: '#2472c8',
+  magenta: '#bc3fbc',
+  cyan: '#11a8cd',
+  white: '#e5e5e5',
+  brightBlack: '#666666',
+  brightRed: '#f14c4c',
+  brightGreen: '#23d18b',
+  brightYellow: '#f5f543',
+  brightBlue: '#3b8eea',
+  brightMagenta: '#d670d6',
+  brightCyan: '#29b8db',
+  brightWhite: '#ffffff',
+}
diff --git a/frontend/src/pages/TerminalPage.vue b/frontend/src/pages/TerminalPage.vue
index 77dd8d2f..71035a93 100644
--- a/frontend/src/pages/TerminalPage.vue
+++ b/frontend/src/pages/TerminalPage.vue
@@ -1,8 +1,7 @@
 <template>
   <v-container
     fluid
-    class="pa-0 d-flex flex-column terminal-root"
-    :class="theme.global.current.value.dark ? 'terminal-root--dark' : 'terminal-root--light'"
+    class="pa-0 d-flex flex-column terminal-root terminal-root--classic"
   >
     <v-menu
       v-model="showTermMenu"
@@ -110,7 +109,6 @@
 <script setup lang="ts">
 import { ref, computed, onMounted, onBeforeUnmount, watch, inject, type Ref } from 'vue'
 import { useRouter } from 'vue-router'
-import { useTheme } from 'vuetify'
 import '@xterm/xterm/css/xterm.css'
 import { useSnackbar } from '@/composables/useSnackbar'
 import { useTerminalSessions } from '@/composables/terminal/useTerminalSessions'
@@ -124,7 +122,6 @@ import TerminalServerPicker from '@/components/terminal/TerminalServerPicker.vue
 defineOptions({ name: 'TerminalPage' })
 
 const router = useRouter()
-const theme = useTheme()
 const snackbar = useSnackbar()
 const nexusDrawer = inject<Ref<boolean>>('nexusDrawer', ref(true))
 
@@ -285,15 +282,17 @@ onBeforeUnmount(() => {
   height: 100%;
   box-sizing: border-box;
 }
-.terminal-root--dark {
-  background: #0b1120;
-}
-.terminal-root--light {
-  background: rgb(var(--v-theme-background));
+.terminal-root--classic {
+  background: #000000;
 }
 .font-mono {
   font-family: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', Menlo, monospace;
 }
+:deep(.xterm),
+:deep(.xterm-viewport),
+:deep(.xterm-screen) {
+  background-color: #000000 !important;
+}
 :deep(.xterm) {
   /* 顶部不加 padding，避免首行字符被 overflow 裁切 */
   padding: 0 4px 4px;
@@ -313,92 +312,48 @@ onBeforeUnmount(() => {
 :deep(.terminal-ctx-menu .v-icon) {
   font-size: 1.35rem;
 }
-.terminal-root--dark :deep(.sh-keyword) {
+.terminal-root--classic :deep(.sh-keyword) {
   color: #60a5fa;
   font-weight: 500;
 }
-.terminal-root--dark :deep(.sh-builtin) {
+.terminal-root--classic :deep(.sh-builtin) {
   color: #38bdf8;
 }
-.terminal-root--dark :deep(.sh-sudo) {
+.terminal-root--classic :deep(.sh-sudo) {
   color: #f87171;
   font-weight: 600;
 }
-.terminal-root--dark :deep(.sh-pipe),
-.terminal-root--dark :deep(.sh-operator) {
+.terminal-root--classic :deep(.sh-pipe),
+.terminal-root--classic :deep(.sh-operator) {
   color: #fbbf24;
   font-weight: 600;
 }
-.terminal-root--dark :deep(.sh-redirect) {
+.terminal-root--classic :deep(.sh-redirect) {
   color: #fb923c;
 }
-.terminal-root--dark :deep(.sh-string) {
+.terminal-root--classic :deep(.sh-string) {
   color: #4ade80;
 }
-.terminal-root--dark :deep(.sh-flag) {
+.terminal-root--classic :deep(.sh-flag) {
   color: #c084fc;
 }
-.terminal-root--dark :deep(.sh-variable) {
+.terminal-root--classic :deep(.sh-variable) {
   color: #f472b6;
 }
-.terminal-root--dark :deep(.sh-backtick) {
+.terminal-root--classic :deep(.sh-backtick) {
   color: #a78bfa;
 }
-.terminal-root--dark :deep(.sh-comment) {
+.terminal-root--classic :deep(.sh-comment) {
   color: #64748b;
   font-style: italic;
 }
-.terminal-root--dark :deep(.sh-number) {
+.terminal-root--classic :deep(.sh-number) {
   color: #fbbf24;
 }
-.terminal-root--dark :deep(.sh-path) {
+.terminal-root--classic :deep(.sh-path) {
   color: #2dd4bf;
 }
-.terminal-root--dark :deep(.sh-text) {
+.terminal-root--classic :deep(.sh-text) {
   color: #e2e8f0;
 }
-.terminal-root--light :deep(.sh-keyword) {
-  color: #2563eb;
-  font-weight: 500;
-}
-.terminal-root--light :deep(.sh-builtin) {
-  color: #0284c7;
-}
-.terminal-root--light :deep(.sh-sudo) {
-  color: #dc2626;
-  font-weight: 600;
-}
-.terminal-root--light :deep(.sh-pipe),
-.terminal-root--light :deep(.sh-operator) {
-  color: #ca8a04;
-  font-weight: 600;
-}
-.terminal-root--light :deep(.sh-redirect) {
-  color: #ea580c;
-}
-.terminal-root--light :deep(.sh-string) {
-  color: #16a34a;
-}
-.terminal-root--light :deep(.sh-flag) {
-  color: #9333ea;
-}
-.terminal-root--light :deep(.sh-variable) {
-  color: #db2777;
-}
-.terminal-root--light :deep(.sh-backtick) {
-  color: #7c3aed;
-}
-.terminal-root--light :deep(.sh-comment) {
-  color: #94a3b8;
-  font-style: italic;
-}
-.terminal-root--light :deep(.sh-number) {
-  color: #d97706;
-}
-.terminal-root--light :deep(.sh-path) {
-  color: #0d9488;
-}
-.terminal-root--light :deep(.sh-text) {
-  color: #0f172a;
-}
 </style>