diff --git a/docs/superpowers/specs/2026-04-15-zotero-collection-import-design.md b/docs/superpowers/specs/2026-04-15-zotero-collection-import-design.md
index f9f3292..6da4ee2 100644
--- a/docs/superpowers/specs/2026-04-15-zotero-collection-import-design.md
+++ b/docs/superpowers/specs/2026-04-15-zotero-collection-import-design.md
@@ -2,43 +2,45 @@
 
 ## Overview
 
-This design upgrades the current left-panel import area from two temporary flows:
+This design replaces the current crowded import area with a lighter flow:
 
-- import current selection from a bridge snapshot
-- text-search fallback import
+- the main page keeps project, cards, and writing views visible
+- the import UI moves into a modal opened from a single `导入文献` button
 
-into one unified Zotero collection importer.
-
-The new importer must visualize the user's current Zotero collection hierarchy, let the user browse collections, display the literature under the selected collection, remember cross-collection checkbox state, and batch-import selected items into the current project.
+The modal visualizes the user's current Zotero collection hierarchy, lets the user browse collections, displays the literature under the selected collection and all descendants, remembers cross-collection checkbox state for the current browser session, and batch-imports selected items into the current project.
 
 This work is intentionally scoped to the import surface only. The project card panel and writing panel remain in place.
 
 ## Goals
 
-- Replace the current left-panel import widgets with one unified `Import From Zotero` section
-- Visualize Zotero collections as a tree in the left panel
+- Replace the current import widgets with one `导入文献` button that opens an import modal
+- Visualize Zotero collections as a tree inside the modal
 - When a collection is selected, show the literature under that collection and all descendant collections
 - Support checkbox-based multi-selection across collection switches
-- Remember previous selection state while the page remains open
+- Remember previous selection state while the page remains open, even if the modal is closed and reopened
 - Support bulk actions:
   - select all items from the current collection plus descendants
   - clear all selected items
   - import selected items into the current project
+- Keep the item list compact by default:
+  - show checkbox and title only
+  - show abstract only after hover delay
 - Preserve the existing project panel, card panel, and writing panel structure
 
 ## Non-Goals
 
 - Full drag-and-drop tree editing
 - Editing Zotero collections
-- Multi-pane import wizard
+- Multi-step import wizard
 - Persisting import selections across browser restarts or across different users
 - Replacing the bridge-based current-selection import flow at the API level
+- Showing abstract text inline for every row by default
 
 The bridge-based import endpoint may remain available, but it is no longer the main UI path.
 
 ## Product Scope
 
-The importer is a left-panel replacement only.
+The importer is a modal-based subflow launched from the main page.
 
 ### Unchanged Areas
 
@@ -58,41 +60,61 @@ The current pair of sections:
 
 will be removed and replaced with:
 
-- `从 Zotero 导入`
+- one `导入文献` button on the main page
+- one `Import From Zotero` modal
 
 ## User Flow
 
-1. The user selects a project
-2. The user browses the Zotero collection tree
-3. The user clicks one collection
-4. The UI loads all literature from that collection and all descendants
-5. The user checks items to import
-6. The user may switch to a different collection and continue selecting
-7. Previously selected items remain selected
-8. The user clicks `导入所选到当前项目`
-9. The backend imports all selected items into the current project
-10. The card panel refreshes with the newly imported cards
+1. The user selects a project or leaves the page without selecting one yet
+2. The user clicks `导入文献`
+3. The modal opens
+4. The user browses the Zotero collection tree
+5. The user clicks one collection
+6. The UI loads all literature from that collection and all descendants
+7. The user checks items to import
+8. The user may switch to a different collection and continue selecting
+9. Previously selected items remain selected
+10. The user clicks `导入所选到当前项目`
+11. The backend imports all selected items into the current project
+12. The card panel refreshes with the newly imported cards
+13. The modal closes on success
 
 ## Layout
 
 The page stays three-column.
 
-### Left Panel
+### Main Page
 
 The left panel contains:
 
 1. `创建项目`
 2. `项目列表`
-3. `从 Zotero 导入`
+3. `导入文献`
 
-### Import Section Structure
+The collection tree and collection item list are no longer rendered inline on the main page.
 
-The import section has three internal regions:
+### Import Modal
 
-1. collection tree
-2. collection item list
+The modal has three internal regions:
+
+1. modal header
+2. modal body
 3. sticky action bar
 
+#### Modal Header
+
+- title
+- current project name or an explicit "未选择项目" state
+- selected count
+- close button
+
+#### Modal Body
+
+- desktop: two-column layout
+  - left: collection tree
+  - right: collection item list
+- narrow screens: automatically stack into top and bottom sections
+
 #### Collection Tree
 
 - tree view with expand/collapse state
@@ -107,9 +129,7 @@ The import section has three internal regions:
 - each row contains:
   - checkbox
   - title
-  - year
-  - item type
-  - compact metadata
+- year, item type, and abstract are not shown inline by default
 - rows already selected in other collections remain checked when shown again
 
 #### Sticky Action Bar
@@ -119,10 +139,28 @@ The import section has three internal regions:
 - `清空选择`
 - `导入所选到当前项目`
 
-The action bar remains visible while scrolling within the import section.
+The action bar remains visible while scrolling within the modal.
 
 ## Interaction Semantics
 
+### Modal Open And Close
+
+Clicking `导入文献` opens the modal.
+
+The modal can be closed by:
+
+- clicking the close button
+- clicking the overlay
+- pressing `Esc`
+
+Closing the modal does not clear:
+
+- `selectedCollectionKey`
+- `expandedCollectionKeys`
+- `selectedItemKeys`
+
+Reopening the modal restores the previous browsing and selection state for the current page session.
+
 ### Collection Selection
 
 Clicking a collection:
@@ -162,26 +200,66 @@ This means:
 `导入所选到当前项目` means:
 
 - require a currently selected project
+- remain disabled when no project is selected
 - submit the full selected item key set to the backend
 - keep the active collection and tree expansion state
 - clear the selected item set on success
+- close the modal on success
 - refresh the project card list
 
+## Abstract Preview Behavior
+
+The item list stays compact by default.
+
+### Desktop
+
+- hovering an item row starts a 3 second timer
+- if the pointer is still on the row after 3 seconds, an abstract preview popover appears
+- if the abstract is empty, no popover appears
+- moving the pointer away before 3 seconds cancels the timer
+- moving the pointer away after the popover appears closes it
+- only one preview popover may be open at a time
+
+### Mobile And Narrow-Screen Fallback
+
+Hover is not reliable on touch devices, so the UI must degrade to an explicit preview trigger such as a small details button per row.
+
+This fallback:
+
+- opens the same abstract preview content
+- does not rely on hover timing
+- does not change batch-selection behavior
+
+### Preview Cancellation Rules
+
+The preview timer or popover closes immediately when:
+
+- the user leaves the row
+- the user scrolls the item list
+- the user changes collection
+- the user clicks a checkbox
+
 ## Frontend State Model
 
 The page should maintain these state keys:
 
+- `isImportModalOpen`
 - `selectedCollectionKey`
 - `expandedCollectionKeys`
 - `selectedItemKeys`
 - `visibleCollectionItems`
+- `hoveredItemKey`
+- `hoverTimerId`
+- `previewItemKey`
 
 ### State Rules
 
+- `isImportModalOpen` changes when the user opens or closes the modal
 - `selectedCollectionKey` changes when the user clicks a tree node
 - `expandedCollectionKeys` changes when nodes are opened or closed
-- `selectedItemKeys` persists across collection switches during the current browser session
+- `selectedItemKeys` persists across collection switches and modal reopen during the current browser session
 - `visibleCollectionItems` updates whenever the active collection changes
+- `hoveredItemKey`, `hoverTimerId`, and `previewItemKey` control delayed abstract preview
 
 `selectedItemKeys` is the source of truth for checkbox rendering and batch import.
 
@@ -256,12 +334,13 @@ The reader should continue to ignore attachment, note, and annotation rows as im
 
 ### No Project Selected
 
-- disable import submission or return a clear UI error
+- allow the modal to open and load Zotero data
+- disable import submission with a clear UI message
 - do not clear selected checkboxes
 
 ### Collection Tree Load Failure
 
-- show error state in the import section
+- show error state inside the modal
 - do not affect cards or writing sections
 
 ### Empty Collection
@@ -276,7 +355,7 @@ The reader should continue to ignore attachment, note, and annotation rows as im
 
 ### Missing Local Zotero Data
 
-- show import section unavailable
+- disable or error the modal content clearly
 - preserve the rest of the application
 
 ## Testing Strategy
@@ -295,7 +374,11 @@ The reader should continue to ignore attachment, note, and annotation rows as im
 
 ### UI Tests
 
-The index template must include:
+The main page must include:
+
+- import-modal trigger button
+
+The modal must include:
 
 - collection tree container
 - collection item list container
@@ -304,8 +387,20 @@ The index template must include:
 - clear-selection button
 - import-selected button
 
+UI behavior must cover:
+
+- modal can open without a selected project
+- import action is disabled when no project is selected
+- closing and reopening the modal preserves selected items during the session
+- import success closes the modal and refreshes cards
+- abstract preview appears only after the hover delay on desktop
+
 ## Constraints And Tradeoffs
 
+### Why Modal Instead Of Left-Panel Inline Import
+
+The inline importer works functionally but makes the main page too crowded. A modal keeps import as a focused subtask and preserves the readability of the project, cards, and writing columns.
+
 ### Why Tree + Side List Instead Of Tree-Mixed Items
 
 The user explicitly chose:
@@ -315,22 +410,29 @@ The user explicitly chose:
 
 This keeps scanning manageable for large libraries and avoids turning the tree itself into an overloaded mixed node structure.
 
+### Why Title-Only Rows By Default
+
+The user explicitly wanted a lighter list. Showing only the title in the default list keeps density under control, while delayed preview preserves access to abstracts when needed.
+
 ### Why Session-Scoped Selection Memory
 
 The user explicitly asked to remember previous selection state, but not to store durable drafts of import batches. Session-scoped state is enough for the workflow and avoids backend persistence complexity.
 
 ### Why Keep Cards And Writing Panels Unchanged
 
-The import feature is a left-panel responsibility. Expanding it into a page-level mode would create unnecessary layout churn and broaden the implementation risk.
+The import feature is a subflow. Expanding it into a permanent page layout would create unnecessary layout churn and broaden the implementation risk.
 
 ## Acceptance Criteria
 
 This feature is complete when:
 
 - the old `导入当前选中` and `后备导入` UI sections are gone
-- the left panel shows a collection tree and descendant-aware collection item list
-- selecting items survives collection switches during the session
+- the main page shows a `导入文献` button instead of an inline importer
+- clicking the button opens a modal with collection tree and descendant-aware item list
+- selecting items survives collection switches and modal reopen during the session
 - the user can select all items from a collection plus descendants
 - the user can clear all current selections
 - the user can batch-import the selected items into the active project
+- the import button is disabled when no project is selected
 - the project card area refreshes after a successful import
+- abstract preview appears only through the delayed preview interaction, not inline by default