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diff --git a/src/components/PreviewPanel.tsx b/src/components/PreviewPanel.tsx
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+++ b/src/components/PreviewPanel.tsx
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+import type { BrandInputs, BrandOutputs, LockedSections } from '../types';
+import { BrandDoc } from './BrandDoc';
+import { CopyButton } from './CopyButton';
+import { toMarkdown, toJSON, toHTML, downloadFile } from '../lib/export';
+
+interface Props {
+  inputs: BrandInputs;
+  outputs: BrandOutputs | null;
+  locked: LockedSections;
+  onToggleLock: (section: keyof LockedSections) => void;
+  onEdit: <K extends keyof BrandOutputs>(key: K, value: BrandOutputs[K]) => void;
+  isGenerating: boolean;
+  generateMode?: 'template' | string;
+  generateError?: string | null;
+  onGenerate?: () => void;
+}
+
+export function PreviewPanel({ inputs, outputs, locked, onToggleLock, onEdit, isGenerating, generateMode, generateError, onGenerate }: Props) {
+  const handleExportMd = () => {
+    if (!outputs) return;
+    downloadFile(toMarkdown(inputs, outputs), `${inputs.name || 'brand'}-package.md`, 'text/markdown');
+  };
+
+  const handleExportJson = () => {
+    if (!outputs) return;
+    downloadFile(toJSON(inputs, outputs), `${inputs.name || 'brand'}-package.json`, 'application/json');
+  };
+
+  const handleExportHtml = () => {
+    if (!outputs) return;
+    downloadFile(toHTML(inputs, outputs), `${inputs.name || 'brand'}-guidelines.html`, 'text/html');
+  };
+
+  const fullMarkdown = outputs ? toMarkdown(inputs, outputs) : '';
+
+  return (
+    <div className="preview-panel">
+      <div className="preview-toolbar">
+        <div className="preview-toolbar-left">
+          <span className="preview-doc-label">
+            {outputs ? 'Brand Package' : 'Preview'}
+          </span>
+          {outputs && (
+            <span style={{ fontSize: 11, color: 'var(--text-4)' }}>
+              · {new Date().toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' })}
+            </span>
+          )}
+        </div>
+        {outputs && (
+          <div className="preview-toolbar-right">
+            <CopyButton text={fullMarkdown} label="Copy all" />
+          </div>
+        )}
+      </div>
+
+      {generateError && (
+        <div className="generate-error">
+          <span className="generate-error-icon">⚠</span>
+          <span className="generate-error-msg">{generateError}</span>
+          {onGenerate && (
+            <button className="generate-error-retry btn btn-ghost" onClick={onGenerate}>
+              Try template instead
+            </button>
+          )}
+        </div>
+      )}
+
+      <div className="preview-scroll">
+        {isGenerating ? (
+          <div className="empty-state">
+            <div className="empty-state-title" style={{ color: 'var(--text-3)' }}>
+              {generateMode && generateMode !== 'template'
+                ? `Thinking with ${generateMode}…`
+                : 'Generating…'}
+            </div>
+            {generateMode && generateMode !== 'template' && (
+              <div className="empty-state-sub">This may take 15–60 seconds depending on your hardware</div>
+            )}
+          </div>
+        ) : outputs ? (
+          <BrandDoc
+            inputs={inputs}
+            outputs={outputs}
+            locked={locked}
+            onToggleLock={onToggleLock}
+            onEdit={onEdit}
+          />
+        ) : (
+          <div className="empty-state">
+            <div className="empty-state-title">No package generated yet</div>
+            <div className="empty-state-sub">Fill in the project details and click Generate</div>
+          </div>
+        )}
+      </div>
+
+      {outputs && (
+        <div className="export-bar">
+          <span className="export-bar-left">
+            Export
+          </span>
+          <div className="export-bar-right">
+            <button className="btn" onClick={handleExportMd}>
+              Export Markdown
+            </button>
+            <button className="btn" onClick={handleExportJson}>
+              Export JSON
+            </button>
+            <button className="btn" onClick={handleExportHtml}>
+              Export HTML
+            </button>
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}