diff --git a/frontend/src/components/editor/EditorWindow.vue b/frontend/src/components/editor/EditorWindow.vue
new file mode 100644
index 0000000..0f6776b
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+++ b/frontend/src/components/editor/EditorWindow.vue
@@ -0,0 +1,229 @@
+<template>
+  <div class="flex flex-col border-b border-[var(--wraith-border)] bg-[var(--wraith-bg-secondary)]" :style="{ height: editorHeight + 'px' }">
+    <!-- Editor toolbar -->
+    <div class="flex items-center justify-between px-3 py-1.5 border-b border-[var(--wraith-border)] shrink-0">
+      <div class="flex items-center gap-2 text-xs min-w-0">
+        <!-- File icon -->
+        <svg class="w-3.5 h-3.5 text-[var(--wraith-text-muted)] shrink-0" viewBox="0 0 16 16" fill="currentColor">
+          <path d="M3.75 1.5a.25.25 0 0 0-.25.25v12.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25V6H9.75A1.75 1.75 0 0 1 8 4.25V1.5H3.75zm5.75.56v2.19c0 .138.112.25.25.25h2.19L9.5 2.06zM2 1.75C2 .784 2.784 0 3.75 0h5.086c.464 0 .909.184 1.237.513l3.414 3.414c.329.328.513.773.513 1.237v8.086A1.75 1.75 0 0 1 12.25 15h-8.5A1.75 1.75 0 0 1 2 13.25V1.75z" />
+        </svg>
+
+        <span class="text-[var(--wraith-text-primary)] truncate font-mono text-[11px]">
+          {{ filePath }}
+        </span>
+
+        <!-- Unsaved indicator -->
+        <span v-if="hasUnsavedChanges" class="w-2 h-2 rounded-full bg-[var(--wraith-accent-yellow)] shrink-0" title="Unsaved changes" />
+      </div>
+
+      <div class="flex items-center gap-2 shrink-0">
+        <!-- Save button -->
+        <button
+          class="px-3 py-1 text-xs rounded transition-colors cursor-pointer"
+          :class="
+            hasUnsavedChanges
+              ? 'bg-[var(--wraith-accent-blue)] text-white hover:bg-blue-600'
+              : 'bg-[var(--wraith-bg-tertiary)] text-[var(--wraith-text-muted)] cursor-not-allowed'
+          "
+          :disabled="!hasUnsavedChanges"
+          @click="handleSave"
+        >
+          Save
+        </button>
+
+        <!-- Close button -->
+        <button
+          class="text-[var(--wraith-text-muted)] hover:text-[var(--wraith-accent-red)] transition-colors cursor-pointer"
+          @click="emit('close')"
+        >
+          <svg class="w-4 h-4" viewBox="0 0 16 16" fill="currentColor">
+            <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06z" />
+          </svg>
+        </button>
+      </div>
+    </div>
+
+    <!-- CodeMirror container -->
+    <div ref="editorRef" class="flex-1 min-h-0 overflow-hidden" />
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, onMounted, onBeforeUnmount, watch } from "vue";
+import { EditorView, keymap, lineNumbers, highlightActiveLine, highlightSpecialChars } from "@codemirror/view";
+import { EditorState } from "@codemirror/state";
+import { defaultKeymap, history, historyKeymap } from "@codemirror/commands";
+import { syntaxHighlighting, defaultHighlightStyle, bracketMatching } from "@codemirror/language";
+import { oneDark } from "@codemirror/theme-one-dark";
+import { closeBrackets, closeBracketsKeymap } from "@codemirror/autocomplete";
+
+const props = defineProps<{
+  content: string;
+  filePath: string;
+  sessionId: string;
+}>();
+
+const emit = defineEmits<{
+  close: [];
+}>();
+
+const editorRef = ref<HTMLElement | null>(null);
+const hasUnsavedChanges = ref(false);
+const editorHeight = ref(300);
+
+let view: EditorView | null = null;
+
+/** Detect language extension from file path. */
+async function getLanguageExtension(path: string) {
+  const ext = path.split(".").pop()?.toLowerCase() ?? "";
+  switch (ext) {
+    case "js":
+    case "jsx":
+    case "ts":
+    case "tsx": {
+      const { javascript } = await import("@codemirror/lang-javascript");
+      return javascript({ jsx: ext.includes("x"), typescript: ext.startsWith("t") });
+    }
+    case "json": {
+      const { json } = await import("@codemirror/lang-json");
+      return json();
+    }
+    case "py": {
+      const { python } = await import("@codemirror/lang-python");
+      return python();
+    }
+    case "md":
+    case "markdown": {
+      const { markdown } = await import("@codemirror/lang-markdown");
+      return markdown();
+    }
+    default:
+      return null;
+  }
+}
+
+onMounted(async () => {
+  if (!editorRef.value) return;
+
+  const langExt = await getLanguageExtension(props.filePath);
+
+  const extensions = [
+    lineNumbers(),
+    highlightActiveLine(),
+    highlightSpecialChars(),
+    history(),
+    bracketMatching(),
+    closeBrackets(),
+    syntaxHighlighting(defaultHighlightStyle, { fallback: true }),
+    oneDark,
+    keymap.of([
+      ...defaultKeymap,
+      ...historyKeymap,
+      ...closeBracketsKeymap,
+    ]),
+    EditorView.updateListener.of((update) => {
+      if (update.docChanged) {
+        hasUnsavedChanges.value = true;
+      }
+    }),
+    EditorView.theme({
+      "&": {
+        height: "100%",
+        fontSize: "13px",
+      },
+      ".cm-scroller": {
+        overflow: "auto",
+        fontFamily: "'JetBrains Mono', 'Cascadia Code', 'Fira Code', Menlo, Monaco, monospace",
+      },
+    }),
+  ];
+
+  if (langExt) {
+    extensions.push(langExt);
+  }
+
+  const state = EditorState.create({
+    doc: props.content,
+    extensions,
+  });
+
+  view = new EditorView({
+    state,
+    parent: editorRef.value,
+  });
+});
+
+onBeforeUnmount(() => {
+  if (view) {
+    view.destroy();
+    view = null;
+  }
+});
+
+// Re-create editor when content/filePath changes
+watch(
+  () => props.filePath,
+  async () => {
+    if (!view || !editorRef.value) return;
+    hasUnsavedChanges.value = false;
+
+    const langExt = await getLanguageExtension(props.filePath);
+    const extensions = [
+      lineNumbers(),
+      highlightActiveLine(),
+      highlightSpecialChars(),
+      history(),
+      bracketMatching(),
+      closeBrackets(),
+      syntaxHighlighting(defaultHighlightStyle, { fallback: true }),
+      oneDark,
+      keymap.of([
+        ...defaultKeymap,
+        ...historyKeymap,
+        ...closeBracketsKeymap,
+      ]),
+      EditorView.updateListener.of((update) => {
+        if (update.docChanged) {
+          hasUnsavedChanges.value = true;
+        }
+      }),
+      EditorView.theme({
+        "&": {
+          height: "100%",
+          fontSize: "13px",
+        },
+        ".cm-scroller": {
+          overflow: "auto",
+          fontFamily: "'JetBrains Mono', 'Cascadia Code', 'Fira Code', Menlo, Monaco, monospace",
+        },
+      }),
+    ];
+
+    if (langExt) {
+      extensions.push(langExt);
+    }
+
+    view.destroy();
+
+    const state = EditorState.create({
+      doc: props.content,
+      extensions,
+    });
+
+    view = new EditorView({
+      state,
+      parent: editorRef.value,
+    });
+  },
+);
+
+function handleSave(): void {
+  if (!view || !hasUnsavedChanges.value) return;
+
+  const _currentContent = view.state.doc.toString();
+  // TODO: Replace with Wails binding call — SFTPService.WriteFile(sessionId, filePath, currentContent)
+  void props.sessionId;
+
+  hasUnsavedChanges.value = false;
+}
+</script>