diff --git a/memento-note/components/brainstorm/convert-notebook-dialog.tsx b/memento-note/components/brainstorm/convert-notebook-dialog.tsx
new file mode 100644
index 0000000..19211b3
--- /dev/null
+++ b/memento-note/components/brainstorm/convert-notebook-dialog.tsx
@@ -0,0 +1,157 @@
+'use client'
+
+import { useState } from 'react'
+import { motion, AnimatePresence } from 'motion/react'
+import { FileText, FolderOpen, ChevronDown, Loader2, X } from 'lucide-react'
+import { useLanguage } from '@/lib/i18n'
+import type { Notebook } from '@/lib/types'
+
+interface ConvertNotebookDialogProps {
+  open: boolean
+  idea: { id: string; title: string } | null
+  notebooks: Notebook[]
+  defaultNotebookId: string | null | undefined
+  onClose: () => void
+  onConfirm: (notebookId: string | null) => void
+}
+
+export function ConvertNotebookDialog({ open, idea, notebooks, defaultNotebookId, onClose, onConfirm }: ConvertNotebookDialogProps) {
+  const { t } = useLanguage()
+  const [showNotebookSelect, setShowNotebookSelect] = useState(false)
+  const [selectedNotebookId, setSelectedNotebookId] = useState<string | null>(defaultNotebookId ?? null)
+  const selectedNotebook = notebooks.find(nb => nb.id === selectedNotebookId)
+  const [loading, setLoading] = useState(false)
+
+  const handleConfirm = () => {
+    setLoading(true)
+    onConfirm(selectedNotebookId)
+  }
+
+  return (
+    <AnimatePresence>
+      {open && idea && (
+        <motion.div
+          initial={{ opacity: 0 }}
+          animate={{ opacity: 1 }}
+          exit={{ opacity: 0 }}
+          transition={{ duration: 0.2 }}
+          className="fixed inset-0 z-[90] flex items-center justify-center bg-black/40 backdrop-blur-sm p-4"
+          onClick={(e) => { if (e.target === e.currentTarget) onClose() }}
+          role="dialog"
+          aria-modal="true"
+          aria-label={t('brainstorm.convertTitle') || 'Create note from idea'}
+        >
+          <motion.div
+            initial={{ scale: 0.92, y: 20 }}
+            animate={{ scale: 1, y: 0 }}
+            exit={{ scale: 0.92, y: 20 }}
+            transition={{ type: 'spring', stiffness: 340, damping: 30 }}
+            className="bg-memento-paper dark:bg-zinc-900 rounded-3xl shadow-2xl border border-border/40 w-full max-w-md overflow-hidden"
+            onClick={(e) => e.stopPropagation()}
+          >
+            <div className="px-6 py-5 border-b border-border/20 flex items-center justify-between">
+              <div className="flex items-center gap-3">
+                <div className="w-9 h-9 rounded-xl bg-emerald-500/10 flex items-center justify-center">
+                  <FileText size={16} className="text-emerald-600 dark:text-emerald-400" />
+                </div>
+                <div>
+                  <h3 className="font-memento-serif text-base font-medium text-ink dark:text-dark-ink">
+                    {t('brainstorm.convertTitle') || 'Create note from idea'}
+                  </h3>
+                  <p className="text-[10px] text-concrete uppercase tracking-widest font-bold">
+                    {t('brainstorm.convertSubtitle') || 'Choose where to save this note'}
+                  </p>
+                </div>
+              </div>
+              <button
+                onClick={onClose}
+                className="p-1.5 rounded-lg text-concrete hover:text-ink hover:bg-black/5 dark:hover:bg-white/5 transition-colors cursor-pointer"
+                aria-label={t('common.close') || 'Close'}
+              >
+                <X size={16} />
+              </button>
+            </div>
+
+            <div className="px-6 py-5 space-y-4">
+              <div className="p-4 rounded-2xl bg-white/60 dark:bg-white/5 border border-border/30">
+                <p className="text-[10px] uppercase tracking-widest font-bold text-concrete mb-2">
+                  {t('brainstorm.ideaLabel') || 'Idea'}
+                </p>
+                <p className="text-sm font-memento-serif text-ink dark:text-dark-ink leading-relaxed line-clamp-3">
+                  {idea.title}
+                </p>
+              </div>
+
+              <div>
+                <p className="text-[10px] uppercase tracking-widest font-bold text-concrete mb-2">
+                  {t('brainstorm.destinationLabel') || 'Notes will be saved to'}
+                </p>
+                <button
+                  onClick={() => setShowNotebookSelect(!showNotebookSelect)}
+                  className="w-full flex items-center justify-between p-3 rounded-xl bg-white/60 dark:bg-white/5 border border-border/30 hover:border-emerald-500/40 transition-colors cursor-pointer"
+                >
+                  <div className="flex items-center gap-2.5">
+                    <div className="w-7 h-7 rounded-lg bg-emerald-500/10 flex items-center justify-center shrink-0">
+                      <FolderOpen size={13} className="text-emerald-600" />
+                    </div>
+                    <span className="text-sm font-medium text-ink dark:text-dark-ink truncate">
+                      {selectedNotebook?.name || t('brainstorm.noNotebook') || 'No notebook'}
+                    </span>
+                  </div>
+                  <ChevronDown size={14} className={`text-concrete transition-transform ${showNotebookSelect ? 'rotate-180' : ''}`} />
+                </button>
+                <AnimatePresence>
+                  {showNotebookSelect && (
+                    <motion.div
+                      initial={{ height: 0, opacity: 0 }}
+                      animate={{ height: 'auto', opacity: 1 }}
+                      exit={{ height: 0, opacity: 0 }}
+                      transition={{ duration: 0.2 }}
+                      className="overflow-hidden"
+                    >
+                      <div className="mt-1 max-h-48 overflow-y-auto rounded-xl border border-border/30 bg-white dark:bg-zinc-800 shadow-lg">
+                        <button
+                          onClick={() => { setSelectedNotebookId(null); setShowNotebookSelect(false) }}
+                          className="w-full text-left px-3 py-2.5 hover:bg-emerald-500/5 transition-colors text-sm text-concrete cursor-pointer"
+                        >
+                          {t('brainstorm.noNotebook') || 'No notebook'}
+                        </button>
+                        {notebooks.map(nb => (
+                          <button
+                            key={nb.id}
+                            onClick={() => { setSelectedNotebookId(nb.id); setShowNotebookSelect(false) }}
+                            className={`w-full text-left px-3 py-2.5 hover:bg-emerald-500/5 transition-colors text-sm cursor-pointer flex items-center gap-2 ${selectedNotebookId === nb.id ? 'text-emerald-600 font-medium' : 'text-ink dark:text-dark-ink'}`}
+                          >
+                            <FolderOpen size={12} className="shrink-0 opacity-50" />
+                            <span className="truncate">{nb.name}</span>
+                          </button>
+                        ))}
+                      </div>
+                    </motion.div>
+                  )}
+                </AnimatePresence>
+              </div>
+            </div>
+
+            <div className="px-6 py-4 border-t border-border/20 flex items-center justify-end gap-3">
+              <button
+                onClick={onClose}
+                disabled={loading}
+                className="px-4 py-2.5 rounded-xl text-sm font-medium text-concrete hover:text-ink hover:bg-black/5 dark:hover:bg-white/5 transition-colors cursor-pointer"
+              >
+                {t('common.cancel')}
+              </button>
+              <button
+                onClick={handleConfirm}
+                disabled={loading}
+                className="px-5 py-2.5 rounded-xl bg-emerald-600 hover:bg-emerald-700 text-white text-sm font-bold uppercase tracking-wider transition-colors cursor-pointer disabled:opacity-50 flex items-center gap-2"
+              >
+                {loading ? <><Loader2 size={14} className="animate-spin" /> {t('common.creating') || 'Creating…'}</> : <><FileText size={14} /> {t('brainstorm.createNote') || 'Create note'}</>}
+              </button>
+            </div>
+          </motion.div>
+        </motion.div>
+      )}
+    </AnimatePresence>
+  )
+}