From f0f11765ff73bc4bfa3353301186f2c379bcf3cb Mon Sep 17 00:00:00 2001
From: Ariver <shanghai3168@gmail.com>
Date: Sat, 06 Jun 2026 23:34:46 +0800
Subject: [PATCH] fix: 严格 Space Lane hit test 垂直 band 检查,空区域(非 lane y band)直接 nil,彻底防止 hoveredSpaceLaneID 误设导致 spaceFocused 粘住 (v0.0.32)

---
 C1.source/Sources/Aligner/QuickSwitchRootView.swift | 1197 +++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 files changed, 1,102 insertions(+), 95 deletions(-)

diff --git a/C1.source/Sources/Aligner/QuickSwitchRootView.swift b/C1.source/Sources/Aligner/QuickSwitchRootView.swift
index 41973d4..7c3bd30 100644
--- a/C1.source/Sources/Aligner/QuickSwitchRootView.swift
+++ b/C1.source/Sources/Aligner/QuickSwitchRootView.swift
@@ -1,5 +1,6 @@
 import AppKit
 import QuartzCore
+import Darwin
 import AlignerCore
 
 enum QuickSwitchCommitSource: String {
@@ -9,6 +10,8 @@
 
 @MainActor
 final class QuickSwitchRootView: NSView {
+    private let backdropBlurView = NSVisualEffectView()
+    private let layerHostView = NSView()
     private let backgroundLayer = CAGradientLayer()
     private let safeAreaFillLayer = CALayer()
     private let glassLayer = CALayer()
@@ -18,6 +21,7 @@
     private let appShelfContentLayer = CALayer()
     private let waterfallLayer = CALayer()
     private let waterfallContentLayer = CALayer()
+    private lazy var closeConfirmationLayers = makeCloseConfirmationLayers()
     private let appIconProvider: any AppIconProviderProtocol = WorkspaceAppIconProvider()
     private let skeletonThumbnailProvider = NativeSkeletonThumbnailProvider(size: NSSize(width: 160, height: 96))
     private var screenshotSourcesByWindowID: [UInt32: ScreenshotResolutionSource] = [:]
@@ -34,6 +38,11 @@
     private var hoveredAppGroupIndex: Int?
     private var hoveredWindowID: UInt32?
     private var hoveredSpaceID: UInt64?
+    private var hoveredCloseTarget: CloseTarget?
+    private var pendingCloseTarget: CloseTarget?
+    private var pendingCloseOptOut = false
+    private var closeConfirmationArrowEdge: CloseConfirmationArrowEdge?
+    private var closeConfirmationRequired = true
     private var hoveredSpaceLaneID: UInt64?
     private var focusedSpaceID: UInt64?
     private var debugHoveredAppGroupIndex: Int?
@@ -63,6 +72,46 @@
     private var hoverResponseLatencyMilliseconds: [Double] = []
     var onEscape: (() -> Void)?
     var onCommitSelection: ((QuickSwitchSelection, QuickSwitchCommitSource) -> Void)?
+    var onRequestClose: ((QuickSwitchCloseRequest) -> Void)?
+    var onCloseConfirmationDisabled: (() -> Void)?
+
+    private enum CloseTarget: Equatable {
+        case app(appGroupIndex: Int)
+        case window(appGroupIndex: Int, windowIndex: Int, windowID: UInt32)
+
+        var kindDescription: String {
+            switch self {
+            case .app:
+                return "app"
+            case .window:
+                return "window"
+            }
+        }
+    }
+
+    private struct CloseButtonLayers {
+        let containerLayer: CALayer
+        let glyphLayer: CAShapeLayer
+    }
+
+    private struct CloseConfirmationLayers {
+        let containerLayer: CALayer
+        let backgroundLayer: CAShapeLayer
+        let titleLayer: CATextLayer
+        let messageLayer: CATextLayer
+        let checkboxLayer: CALayer
+        let checkboxMarkLayer: CATextLayer
+        let checkboxLabelLayer: CATextLayer
+        let confirmButtonLayer: CALayer
+        let confirmButtonTextLayer: CATextLayer
+        let cancelButtonLayer: CALayer
+        let cancelButtonTextLayer: CATextLayer
+    }
+
+    private enum CloseConfirmationArrowEdge: String {
+        case left
+        case right
+    }
 
     private struct SpaceLaneSegmentLayers {
         let space: QuickSwitchSpaceViewModel
@@ -82,6 +131,7 @@
         let labelLayer: CATextLayer
         let badgeLayer: CATextLayer
         let selectedIndicatorLayer: CALayer
+        let closeButton: CloseButtonLayers
     }
 
     private struct AppShelfLayout {
@@ -101,12 +151,14 @@
     private struct WaterfallCardLayers {
         let item: QuickSwitchWindowCardViewModel
         let containerLayer: CALayer
+        let titleBarLayer: CALayer
         let titleLayer: CATextLayer
         let metaLayer: CATextLayer
         let thumbnailLayer: CALayer
         let appIconLayer: CALayer
         let stateLayer: CATextLayer
         let shineLayer: CAGradientLayer
+        let closeButton: CloseButtonLayers
     }
 
     private enum AppShelfMetrics {
@@ -134,7 +186,7 @@
         static let columnMaxWidth: CGFloat = 292
         static let columnPadding: CGFloat = 12
         static let headerHeight: CGFloat = 34
-        static let cardHeight: CGFloat = 118
+        static let cardHeight: CGFloat = 138
         static let cardGap: CGFloat = 12
         static let revealPadding: CGFloat = 24
     }
@@ -152,12 +204,16 @@
 
     override init(frame frameRect: NSRect) {
         super.init(frame: frameRect)
+        setupBackdropBlurView()
+        setupLayerHostView()
         wantsLayer = true
         setupLayers()
     }
 
     required init?(coder: NSCoder) {
         super.init(coder: coder)
+        setupBackdropBlurView()
+        setupLayerHostView()
         wantsLayer = true
         setupLayers()
     }
@@ -185,6 +241,8 @@
 
     override func layout() {
         super.layout()
+        backdropBlurView.frame = bounds
+        layerHostView.frame = bounds
         layoutLayers()
     }
 
@@ -255,6 +313,12 @@
     override func mouseMoved(with event: NSEvent) {
         guard debugHoveredAppGroupIndex == nil else { return }
 
+        let closeTarget = closeButtonTarget(at: event.locationInWindow)
+        if hoveredCloseTarget != closeTarget {
+            hoveredCloseTarget = closeTarget
+            needsLayout = true
+        }
+
         if let segment = spaceLaneSegment(at: event.locationInWindow) {
             hoverSpaceLaneSegment(segment)
             return
@@ -282,16 +346,27 @@
         }
 
         hoveredSpaceLaneID = nil
+        hoveredCloseTarget = nil
         updateHoverState(appGroupIndex: nil, windowID: nil, spaceID: nil)
     }
 
     override func mouseExited(with event: NSEvent) {
         guard debugHoveredAppGroupIndex == nil else { return }
         hoveredSpaceLaneID = nil
+        hoveredCloseTarget = nil
         updateHoverState(appGroupIndex: nil, windowID: nil, spaceID: nil)
     }
 
     override func mouseDown(with event: NSEvent) {
+        if handleCloseConfirmationMouseDown(at: event.locationInWindow) {
+            return
+        }
+
+        if let closeTarget = closeButtonTarget(at: event.locationInWindow) {
+            beginCloseConfirmation(for: closeTarget)
+            return
+        }
+
         if let card = waterfallCard(at: event.locationInWindow) {
             clickWindowCard(card)
             return
@@ -351,6 +426,9 @@
             if isHoverCommand(command) {
                 hoverResponseLatencyMilliseconds.append(elapsed)
             }
+            if lastCommitSource == .mouse {
+                break
+            }
         }
     }
 
@@ -373,6 +451,17 @@
         keyboardResponseLatencyMilliseconds = []
         mouseResponseLatencyMilliseconds = []
         hoverResponseLatencyMilliseconds = []
+    }
+
+    func setCloseConfirmationRequired(_ required: Bool) {
+        closeConfirmationRequired = required
+        if !required {
+            pendingCloseTarget = nil
+            pendingCloseOptOut = false
+            closeConfirmationLayers.containerLayer.isHidden = true
+            closeConfirmationArrowEdge = nil
+        }
+        needsLayout = true
     }
 
     func applyScreenshot(_ resolution: ScreenshotResolution, for windowID: UInt32) {
@@ -420,6 +509,11 @@
         lastAppShelfScrollSyncedAppGroupIndex = nil
         hoveredWindowID = nil
         hoveredSpaceID = nil
+        hoveredCloseTarget = nil
+        pendingCloseTarget = nil
+        pendingCloseOptOut = false
+        closeConfirmationLayers.containerLayer.isHidden = true
+        closeConfirmationArrowEdge = nil
         hoveredSpaceLaneID = nil
         focusedSpaceID = nil
         if debugHoveredAppGroupIndex == nil {
@@ -526,6 +620,13 @@
             "hoveredAppGroupIndex": effectiveHoveredAppGroupIndex ?? NSNull(),
             "hoveredWindowID": hoveredWindowID ?? NSNull(),
             "hoveredSpaceID": hoveredSpaceID ?? NSNull(),
+            "hoveredCloseTargetKind": hoveredCloseTarget?.kindDescription ?? NSNull(),
+            "pendingCloseTargetKind": pendingCloseTarget?.kindDescription ?? NSNull(),
+            "pendingCloseOptOut": pendingCloseOptOut,
+            "closeConfirmationRequired": closeConfirmationRequired,
+            "closeConfirmationVisible": !closeConfirmationLayers.containerLayer.isHidden,
+            "closeConfirmationFrame": dictionary(from: closeConfirmationLayers.containerLayer.frame),
+            "closeConfirmationArrowEdge": closeConfirmationArrowEdge?.rawValue ?? NSNull(),
             "mouseCommandsApplied": mouseCommandsApplied,
             "lastMouseCommand": lastMouseCommand ?? NSNull(),
             "lastClickedAppGroupIndex": lastClickedAppGroupIndex ?? NSNull(),
@@ -627,6 +728,20 @@
             }
             recordMouseCommand("click-app:\(appGroupIndex)")
             clickAppShelfItem(appGroupIndex: appGroupIndex)
+        case "hover-app-close" where parts.count == 2:
+            guard let appGroupIndex = Int(parts[1]) else {
+                recordMouseCommand("invalid:\(command)")
+                return
+            }
+            recordMouseCommand("hover-app-close:\(appGroupIndex)")
+            hoverAppCloseButton(appGroupIndex)
+        case "click-app-close" where parts.count == 2:
+            guard let appGroupIndex = Int(parts[1]) else {
+                recordMouseCommand("invalid:\(command)")
+                return
+            }
+            recordMouseCommand("click-app-close:\(appGroupIndex)")
+            clickAppCloseButton(appGroupIndex)
         case "scroll-app-shelf" where parts.count == 2:
             guard let targetOffset = Double(parts[1]) else {
                 recordMouseCommand("invalid:\(command)")
@@ -670,6 +785,29 @@
             if let card = waterfallCard(appGroupIndex: appGroupIndex, windowIndex: windowIndex) {
                 clickWindowCard(card)
             }
+        case "hover-card-close" where parts.count == 3:
+            guard let appGroupIndex = Int(parts[1]), let windowIndex = Int(parts[2]) else {
+                recordMouseCommand("invalid:\(command)")
+                return
+            }
+            recordMouseCommand("hover-card-close:\(appGroupIndex):\(windowIndex)")
+            hoverCardCloseButton(appGroupIndex: appGroupIndex, windowIndex: windowIndex)
+        case "click-card-close" where parts.count == 3:
+            guard let appGroupIndex = Int(parts[1]), let windowIndex = Int(parts[2]) else {
+                recordMouseCommand("invalid:\(command)")
+                return
+            }
+            recordMouseCommand("click-card-close:\(appGroupIndex):\(windowIndex)")
+            clickCardCloseButton(appGroupIndex: appGroupIndex, windowIndex: windowIndex)
+        case "toggle-close-optout":
+            recordMouseCommand("toggle-close-optout")
+            toggleCloseConfirmationOptOut()
+        case "confirm-close":
+            recordMouseCommand("confirm-close")
+            confirmPendingClose()
+        case "cancel-close":
+            recordMouseCommand("cancel-close")
+            cancelPendingClose()
         default:
             recordMouseCommand("unknown:\(command)")
         }
@@ -689,6 +827,7 @@
 
     private func hoverAppGroup(_ appGroupIndex: Int) {
         hoveredSpaceLaneID = nil
+        hoveredCloseTarget = nil
         updateHoverState(
             appGroupIndex: appGroupIndex,
             windowID: nil,
@@ -697,12 +836,47 @@
         )
     }
 
+    private func hoverAppCloseButton(_ appGroupIndex: Int) {
+        hoverAppGroup(appGroupIndex)
+        hoveredCloseTarget = .app(appGroupIndex: appGroupIndex)
+        needsLayout = true
+    }
+
+    private func clickAppCloseButton(_ appGroupIndex: Int) {
+        hoverAppCloseButton(appGroupIndex)
+        beginCloseConfirmation(for: .app(appGroupIndex: appGroupIndex))
+    }
+
     private func hoverWindowCard(_ card: WaterfallCardLayers) {
         hoveredSpaceLaneID = nil
+        hoveredCloseTarget = nil
         updateHoverState(
             appGroupIndex: card.item.appGroupIndex,
             windowID: card.item.window.id,
             spaceID: card.item.primarySpaceID
+        )
+    }
+
+    private func hoverCardCloseButton(appGroupIndex: Int, windowIndex: Int) {
+        guard let card = waterfallCard(appGroupIndex: appGroupIndex, windowIndex: windowIndex) else { return }
+        hoverWindowCard(card)
+        hoveredCloseTarget = .window(
+            appGroupIndex: appGroupIndex,
+            windowIndex: windowIndex,
+            windowID: card.item.window.id
+        )
+        needsLayout = true
+    }
+
+    private func clickCardCloseButton(appGroupIndex: Int, windowIndex: Int) {
+        guard let card = waterfallCard(appGroupIndex: appGroupIndex, windowIndex: windowIndex) else { return }
+        hoverCardCloseButton(appGroupIndex: appGroupIndex, windowIndex: windowIndex)
+        beginCloseConfirmation(
+            for: .window(
+                appGroupIndex: appGroupIndex,
+                windowIndex: windowIndex,
+                windowID: card.item.window.id
+            )
         )
     }
 
@@ -715,7 +889,17 @@
             "spaceID": segment.space.id,
             "label": segment.space.label
         ])
-        focusSpace(segment.space.id, persistent: true)
+        lastSpaceLaneClickSpaceID = segment.space.id
+
+        guard let firstCard = firstWaterfallCard(inSpaceID: segment.space.id) else {
+            DevelopmentDiagnostics.log("quickSwitch.view.clickSpaceLane.emptySpaceUnsupported", [
+                "spaceID": segment.space.id,
+                "label": segment.space.label
+            ])
+            return
+        }
+
+        commitWindowCard(firstCard, trigger: "spaceLane")
     }
 
     private func focusSpace(_ spaceID: UInt64, persistent: Bool) {
@@ -766,12 +950,14 @@
             columnSelectionHistory[nextSelection.appGroupIndex] = nextSelection.windowIndex
             lastAppShelfClickChangedSelection = previousSelection != nextSelection
             ensureWaterfallSelectionVisible(nextSelection, horizontalIntent: .alignWithAppShelf(animated: true))
+            updateHoverState(appGroupIndex: appGroupIndex, windowID: nil, spaceID: nil)
+            commitWindowCard(firstCard, trigger: "appShelf")
         } else {
             lastAppShelfClickChangedSelection = false
             ensureWaterfallColumnVisible(column)
+            updateHoverState(appGroupIndex: appGroupIndex, windowID: nil, spaceID: nil)
+            needsLayout = true
         }
-        updateHoverState(appGroupIndex: appGroupIndex, windowID: nil, spaceID: nil)
-        needsLayout = true
     }
 
     private func scrollAppShelf(to targetOffset: CGFloat) {
@@ -813,12 +999,17 @@
 
     private func clickWindowCard(_ card: WaterfallCardLayers) {
         hoverWindowCard(card)
+        commitWindowCard(card, trigger: "windowCard")
+    }
+
+    private func commitWindowCard(_ card: WaterfallCardLayers, trigger: String) {
         let selection = QuickSwitchSelection(
             appGroupIndex: card.item.appGroupIndex,
             windowIndex: card.item.windowIndex,
             windowID: card.item.window.id
         )
-        DevelopmentDiagnostics.log("quickSwitch.view.clickWindowCard", [
+        DevelopmentDiagnostics.log("quickSwitch.view.commitMouseWindow", [
+            "trigger": trigger,
             "appGroupIndex": selection.appGroupIndex,
             "windowIndex": selection.windowIndex,
             "windowID": selection.windowID,
@@ -1176,13 +1367,32 @@
         value ?? NSNull()
     }
 
+    private func setupBackdropBlurView() {
+        backdropBlurView.material = .fullScreenUI
+        backdropBlurView.blendingMode = .behindWindow
+        backdropBlurView.state = .active
+        backdropBlurView.isEmphasized = false
+        backdropBlurView.frame = bounds
+        backdropBlurView.autoresizingMask = [.width, .height]
+        addSubview(backdropBlurView, positioned: .below, relativeTo: nil)
+    }
+
+    private func setupLayerHostView() {
+        layerHostView.wantsLayer = true
+        layerHostView.frame = bounds
+        layerHostView.autoresizingMask = [.width, .height]
+        layerHostView.layer?.masksToBounds = true
+        layerHostView.layer?.backgroundColor = NSColor.clear.cgColor
+        addSubview(layerHostView, positioned: .above, relativeTo: backdropBlurView)
+    }
+
     private func setupLayers() {
-        guard let rootLayer = layer else { return }
+        guard let rootLayer = layerHostView.layer else { return }
 
         rootLayer.masksToBounds = true
         backgroundLayer.colors = [
-            NSColor.windowBackgroundColor.withAlphaComponent(0.72).cgColor,
-            NSColor.controlBackgroundColor.withAlphaComponent(0.62).cgColor
+            NSColor.windowBackgroundColor.withAlphaComponent(0.58).cgColor,
+            NSColor.controlBackgroundColor.withAlphaComponent(0.48).cgColor
         ]
         backgroundLayer.startPoint = CGPoint(x: 0.5, y: 1.0)
         backgroundLayer.endPoint = CGPoint(x: 0.5, y: 0.0)
@@ -1198,13 +1408,13 @@
         glassLayer.shadowOpacity = 0
         rootLayer.addSublayer(glassLayer)
 
-        laneLayer.backgroundColor = NSColor.controlBackgroundColor.withAlphaComponent(0.50).cgColor
+        laneLayer.backgroundColor = NSColor.controlBackgroundColor.withAlphaComponent(0.68).cgColor
         laneLayer.cornerRadius = 16
         laneLayer.masksToBounds = true
         glassLayer.addSublayer(laneLayer)
         laneLayer.addSublayer(spaceLaneContentLayer)
 
-        shelfLayer.backgroundColor = NSColor.controlBackgroundColor.withAlphaComponent(0.42).cgColor
+        shelfLayer.backgroundColor = NSColor.clear.cgColor
         shelfLayer.cornerRadius = 16
         shelfLayer.masksToBounds = true
         glassLayer.addSublayer(shelfLayer)
@@ -1214,6 +1424,9 @@
         waterfallLayer.masksToBounds = true
         glassLayer.addSublayer(waterfallLayer)
         waterfallLayer.addSublayer(waterfallContentLayer)
+
+        closeConfirmationLayers.containerLayer.isHidden = true
+        glassLayer.addSublayer(closeConfirmationLayers.containerLayer)
     }
 
     private func rebuildAppShelfItems() {
@@ -1266,11 +1479,13 @@
 
             let selectedIndicator = CALayer()
             selectedIndicator.isHidden = true
+            let closeButton = makeCloseButtonLayers()
 
             container.addSublayer(background)
             container.addSublayer(icon)
             container.addSublayer(label)
             container.addSublayer(badge)
+            container.addSublayer(closeButton.containerLayer)
             appShelfContentLayer.addSublayer(container)
 
             return AppShelfItemLayers(
@@ -1280,7 +1495,8 @@
                 iconLayer: icon,
                 labelLayer: label,
                 badgeLayer: badge,
-                selectedIndicatorLayer: selectedIndicator
+                selectedIndicatorLayer: selectedIndicator,
+                closeButton: closeButton
             )
         }
     }
@@ -1296,12 +1512,12 @@
             container.name = column.app.name
             container.cornerRadius = 14
             container.masksToBounds = true
-            container.backgroundColor = NSColor.controlBackgroundColor.withAlphaComponent(0.34).cgColor
-            container.borderColor = NSColor.separatorColor.withAlphaComponent(0.28).cgColor
+            container.backgroundColor = NSColor.controlBackgroundColor.withAlphaComponent(0.56).cgColor
+            container.borderColor = NSColor.separatorColor.withAlphaComponent(0.34).cgColor
             container.borderWidth = 1
 
             let header = CALayer()
-            header.backgroundColor = NSColor.controlBackgroundColor.withAlphaComponent(0.58).cgColor
+            header.backgroundColor = NSColor.controlBackgroundColor.withAlphaComponent(0.68).cgColor
 
             let appName = makeTextLayer(
                 string: column.app.name,
@@ -1333,6 +1549,9 @@
                 thumbnail.masksToBounds = true
                 thumbnail.contents = skeletonThumbnailProvider
                     .withOverlayTitle(window.window.title, for: window.window.app)
+
+                let titleBar = CALayer()
+                titleBar.borderWidth = 0
 
                 let title = makeTextLayer(
                     string: window.window.title.isEmpty ? "Untitled Window" : window.window.title,
@@ -1370,24 +1589,29 @@
                 shine.startPoint = CGPoint(x: 0, y: 1)
                 shine.endPoint = CGPoint(x: 1, y: 0)
                 shine.opacity = 0
+                let closeButton = makeCloseButtonLayers()
 
                 card.addSublayer(thumbnail)
+                card.addSublayer(titleBar)
                 card.addSublayer(appIcon)
                 card.addSublayer(title)
                 card.addSublayer(meta)
                 card.addSublayer(state)
                 card.addSublayer(shine)
+                card.addSublayer(closeButton.containerLayer)
                 container.addSublayer(card)
 
                 return WaterfallCardLayers(
                     item: window,
                     containerLayer: card,
+                    titleBarLayer: titleBar,
                     titleLayer: title,
                     metaLayer: meta,
                     thumbnailLayer: thumbnail,
                     appIconLayer: appIcon,
                     stateLayer: state,
-                    shineLayer: shine
+                    shineLayer: shine,
+                    closeButton: closeButton
                 )
             }
 
@@ -1436,12 +1660,15 @@
                 alignment: .center
             )
             let appLayer = makeTextLayer(
-                string: appIdentifierText(for: space.appNames),
+                string: appIdentifierText(for: space),
                 fontSize: 12,
-                weight: .regular,
-                color: .secondaryLabelColor
+                weight: space.type == .fullscreen ? .medium : .regular,
+                color: space.type == .fullscreen ? .labelColor : .secondaryLabelColor,
+                alignment: space.type == .fullscreen ? .center : .left
             )
-            let windowBlocks = makeWindowBlocks(count: min(space.windowCount, 5), space: space)
+            let windowBlocks = space.type == .fullscreen
+                ? []
+                : makeWindowBlocks(count: min(space.windowCount, 5), space: space)
             let fullscreenMarkerLayer = makeFullscreenMarkerLayer(for: space)
 
             container.addSublayer(labelLayer)
@@ -1512,6 +1739,7 @@
         layoutSpaceLaneSegments()
         layoutAppShelfItems()
         layoutWaterfallColumns()
+        layoutCloseConfirmation()
 
         CATransaction.commit()
     }
@@ -1637,20 +1865,24 @@
         let isCurrent = segment.space.isCurrent
         let isActive = isHovered || isFocused
 
-        segment.containerLayer.borderWidth = isCurrent ? 1.5 : 1
-        segment.containerLayer.borderColor = (isCurrent
-            ? NSColor.labelColor.withAlphaComponent(0.34)
-            : isActive
-                ? NSColor.labelColor.withAlphaComponent(0.24)
+        segment.containerLayer.borderWidth = (isCurrent || isActive) ? 1.5 : 1
+        segment.containerLayer.borderColor = (isActive
+            ? NSColor.controlAccentColor.withAlphaComponent(0.54)
+            : isCurrent
+                ? NSColor.labelColor.withAlphaComponent(0.34)
                 : NSColor.separatorColor.withAlphaComponent(0.34)
         ).cgColor
         segment.containerLayer.backgroundColor = (isActive
-            ? NSColor.windowBackgroundColor.withAlphaComponent(0.76)
+            ? accentTintedWindowBackground(fraction: 0.10, alpha: 0.94)
             : spaceColor(for: segment.space)
         ).cgColor
-        segment.containerLayer.shadowOpacity = isCurrent ? 0.12 : isActive ? 0.08 : 0
-        segment.containerLayer.shadowRadius = isCurrent ? 10 : isActive ? 7 : 0
-        segment.containerLayer.shadowOffset = CGSize(width: 0, height: isCurrent ? -2 : -1)
+        segment.containerLayer.shadowOpacity = isActive ? 0.26 : isCurrent ? 0.14 : 0
+        segment.containerLayer.shadowRadius = isActive ? 24 : isCurrent ? 12 : 0
+        segment.containerLayer.shadowOffset = CGSize(width: 0, height: isActive ? -6 : isCurrent ? -2.5 : 0)
+        segment.containerLayer.zPosition = isActive ? 30 : isCurrent ? 10 : 0
+        segment.containerLayer.transform = isActive
+            ? CATransform3DMakeScale(1.03, 1.03, 1)
+            : CATransform3DIdentity
         segment.containerLayer.shadowPath = CGPath(
             roundedRect: segment.containerLayer.bounds,
             cornerWidth: segment.containerLayer.cornerRadius,
@@ -1697,6 +1929,16 @@
 
     private func spaceLaneSegment(at windowLocation: CGPoint) -> SpaceLaneSegmentLayers? {
         let locationInView = convert(windowLocation, from: nil)
+
+        // 严格 band 检查:只有鼠标在 lane 的垂直 band 内才考虑是 lane hover。
+        // 防止“完全空的地方”(y 不在 lane 高度范围内)误 hit 到 segment frame,
+        // 导致 hoveredSpaceLaneID 粘住、activeSpaceFocusID 非 nil、窗口 spaceFocused 高亮。
+        let laneMinYInView = glassLayer.frame.minY + laneLayer.frame.minY
+        let laneMaxYInView = laneMinYInView + laneLayer.frame.height
+        if locationInView.y < laneMinYInView || locationInView.y > laneMaxYInView {
+            return nil
+        }
+
         let locationInSpaceLaneContent = CGPoint(
             x: locationInView.x - glassLayer.frame.minX - laneLayer.frame.minX - spaceLaneContentLayer.frame.minX,
             y: locationInView.y - glassLayer.frame.minY - laneLayer.frame.minY - spaceLaneContentLayer.frame.minY
@@ -1754,8 +1996,20 @@
         let bounds = segment.containerLayer.bounds
         segment.labelLayer.frame = CGRect(x: 10, y: bounds.height - 29, width: max(1, bounds.width - 48), height: 20)
         segment.countLayer.frame = CGRect(x: bounds.width - 34, y: bounds.height - 29, width: 24, height: 20)
-        segment.appLayer.frame = CGRect(x: 10, y: 9, width: max(1, bounds.width - 20), height: 17)
-        segment.fullscreenMarkerLayer?.frame = CGRect(x: 10, y: bounds.height - 7, width: max(1, bounds.width - 20), height: 3)
+        if segment.space.type == .fullscreen {
+            let markerFrame = fullscreenMarkerFrame(in: bounds)
+            segment.appLayer.frame = CGRect(
+                x: 8,
+                y: markerFrame.midY - 8.5,
+                width: max(1, bounds.width - 16),
+                height: 17
+            )
+        } else {
+            segment.appLayer.frame = CGRect(x: 10, y: 9, width: max(1, bounds.width - 20), height: 17)
+        }
+        if let fullscreenMarkerLayer = segment.fullscreenMarkerLayer {
+            layoutFullscreenMarkerLayer(fullscreenMarkerLayer, in: bounds)
+        }
 
         let blockGap: CGFloat = 5
         let blockWidth = max(12, min(22, (bounds.width - 20 - CGFloat(max(0, segment.windowBlocks.count - 1)) * blockGap) / CGFloat(max(1, segment.windowBlocks.count))))
@@ -1815,38 +2069,60 @@
     private func layoutAppShelfItemContents(_ item: AppShelfItemLayers, iconSize: CGFloat) {
         let bounds = item.containerLayer.bounds
         let isSelected = item.item.appGroupIndex == effectiveSelection?.appGroupIndex
+        let showsSelectedVisual = shouldShowSelectedVisual(isSelected)
         let isHovered = item.item.appGroupIndex == effectiveHoveredAppGroupIndex
         let isSpaceFocused = spaceFocusWindowCount(for: item.item.appGroupIndex) > 0
-        let visualIconSize = appShelfVisualIconSize(forBaseIconSize: iconSize, selected: isSelected, hovered: isHovered)
-        let backgroundPadding: CGFloat = (isSelected || isHovered) ? 4 : 2
+        let visualIconSize = appShelfVisualIconSize(
+            forBaseIconSize: iconSize,
+            selected: showsSelectedVisual,
+            hovered: isHovered,
+            spaceFocused: isSpaceFocused
+        )
+        let backgroundPadding: CGFloat = (showsSelectedVisual || isHovered)
+            ? 4
+            : isSpaceFocused
+                ? 6
+                : 2
         let iconX = (bounds.width - visualIconSize) / 2
         let iconY = bounds.height - visualIconSize - 2
         let badgeText = appShelfBadgeText(for: item)
         let badgeWidth = max(18, CGFloat(badgeText.count) * 7 + 8)
 
-        item.containerLayer.zPosition = appShelfZPosition(selected: isSelected, hovered: isHovered)
+        item.containerLayer.zPosition = appShelfZPosition(
+            selected: showsSelectedVisual,
+            hovered: isHovered,
+            spaceFocused: isSpaceFocused
+        )
         item.backgroundLayer.backgroundColor = appShelfBackgroundColor(
-            selected: isSelected,
+            selected: showsSelectedVisual,
             hovered: isHovered,
             spaceFocused: isSpaceFocused
         ).cgColor
-        item.backgroundLayer.borderColor = (isSelected
-            ? NSColor.separatorColor.withAlphaComponent(0.38)
+        item.backgroundLayer.borderColor = (showsSelectedVisual
+            ? NSColor.controlAccentColor.withAlphaComponent(0.40)
             : isHovered
-                ? NSColor.separatorColor.withAlphaComponent(0.28)
+                ? NSColor.controlAccentColor.withAlphaComponent(0.36)
                 : NSColor.clear
         ).cgColor
-        item.backgroundLayer.borderWidth = (isSelected || isHovered) ? 1 : 0
+        item.backgroundLayer.borderWidth = (showsSelectedVisual || isHovered) ? 1 : 0
         item.backgroundLayer.shadowColor = NSColor.black.cgColor
-        item.backgroundLayer.shadowOpacity = isSelected ? 0.11 : isHovered ? 0.06 : 0
-        item.backgroundLayer.shadowRadius = isSelected ? 10 : isHovered ? 7 : 0
-        item.backgroundLayer.shadowOffset = CGSize(width: 0, height: -2)
+        item.backgroundLayer.shadowOpacity = showsSelectedVisual ? 0.11 : isHovered ? 0.07 : isSpaceFocused ? 0.18 : 0
+        item.backgroundLayer.shadowRadius = showsSelectedVisual ? 10 : isHovered ? 8 : isSpaceFocused ? 18 : 0
+        item.backgroundLayer.shadowOffset = CGSize(width: 0, height: isSpaceFocused ? -4 : -2)
         item.backgroundLayer.frame = CGRect(
             x: iconX - backgroundPadding,
             y: iconY - backgroundPadding,
             width: visualIconSize + backgroundPadding * 2,
             height: visualIconSize + backgroundPadding * 2
         )
+        item.backgroundLayer.shadowPath = (showsSelectedVisual || isHovered || isSpaceFocused)
+            ? CGPath(
+                roundedRect: item.backgroundLayer.bounds,
+                cornerWidth: item.backgroundLayer.cornerRadius,
+                cornerHeight: item.backgroundLayer.cornerRadius,
+                transform: nil
+            )
+            : nil
         item.iconLayer.frame = CGRect(x: iconX, y: iconY, width: visualIconSize, height: visualIconSize)
         item.labelLayer.contentsScale = backingScaleFactor
         item.labelLayer.frame = CGRect(x: 0, y: 0, width: bounds.width, height: 14)
@@ -1861,6 +2137,15 @@
             y: iconY - 2,
             width: badgeWidth,
             height: 16
+        )
+        layoutCloseButton(
+            item.closeButton,
+            target: .app(appGroupIndex: item.item.appGroupIndex),
+            visible: isHovered && canClose(app: item.item.app),
+            anchorTopRight: CGPoint(
+                x: min(iconX + visualIconSize - 6, bounds.width - 12),
+                y: min(iconY + visualIconSize - 6, bounds.height - 12)
+            )
         )
         item.selectedIndicatorLayer.frame = .zero
         item.selectedIndicatorLayer.backgroundColor = NSColor.clear.cgColor
@@ -1889,7 +2174,15 @@
     }
 
     private var activeSpaceFocusID: UInt64? {
-        focusedSpaceID ?? hoveredSpaceLaneID
+        hoveredSpaceLaneID
+    }
+
+    private var isSpaceAssociationActive: Bool {
+        activeSpaceFocusID != nil
+    }
+
+    private func shouldShowSelectedVisual(_ isSelected: Bool) -> Bool {
+        isSelected && !isSpaceAssociationActive
     }
 
     private func spaceFocusedAppGroupIndexes() -> [Int] {
@@ -1905,6 +2198,18 @@
             }
             .map(\.column.appGroupIndex)
             .sorted()
+    }
+
+    private func firstWaterfallCard(inSpaceID spaceID: UInt64) -> WaterfallCardLayers? {
+        for column in waterfallColumns.sorted(by: { $0.column.appGroupIndex < $1.column.appGroupIndex }) {
+            if let card = column.cards
+                .sorted(by: { $0.item.windowIndex < $1.item.windowIndex })
+                .first(where: { $0.item.primarySpaceID == spaceID }) {
+                return card
+            }
+        }
+
+        return nil
     }
 
     private func spaceFocusWindowCount(for appGroupIndex: Int) -> Int {
@@ -1935,33 +2240,45 @@
         return "visible"
     }
 
-    private func appShelfVisualIconSize(forBaseIconSize iconSize: CGFloat, selected: Bool, hovered: Bool) -> CGFloat {
-        guard selected || hovered else { return iconSize }
-        return AppShelfMetrics.selectedIconSize
+    private func appShelfVisualIconSize(
+        forBaseIconSize iconSize: CGFloat,
+        selected: Bool,
+        hovered: Bool,
+        spaceFocused: Bool
+    ) -> CGFloat {
+        if selected || hovered {
+            return AppShelfMetrics.selectedIconSize
+        }
+        if spaceFocused {
+            return min(AppShelfMetrics.selectedIconSize, iconSize + 8)
+        }
+        return iconSize
     }
 
-    private func appShelfZPosition(selected: Bool, hovered: Bool) -> CGFloat {
-        switch (selected, hovered) {
-        case (true, true):
+    private func appShelfZPosition(selected: Bool, hovered: Bool, spaceFocused: Bool) -> CGFloat {
+        switch (selected, hovered, spaceFocused) {
+        case (true, true, _):
             return 30
-        case (true, false):
-            return 20
-        case (false, true):
-            return 10
-        case (false, false):
+        case (true, false, _):
+            return 24
+        case (false, true, _):
+            return 18
+        case (false, false, true):
+            return 12
+        case (false, false, false):
             return 0
         }
     }
 
     private func appShelfBackgroundColor(selected: Bool, hovered: Bool, spaceFocused: Bool) -> NSColor {
         if selected {
-            return NSColor.controlAccentColor.withAlphaComponent(0.12)
+            return NSColor.controlAccentColor.withAlphaComponent(0.14)
         }
         if hovered {
-            return NSColor.systemFill.withAlphaComponent(0.12)
+            return NSColor.controlAccentColor.withAlphaComponent(0.13)
         }
         if spaceFocused {
-            return NSColor.keyboardFocusIndicatorColor.withAlphaComponent(0.10)
+            return NSColor.controlAccentColor.withAlphaComponent(0.14)
         }
         return .clear
     }
@@ -2090,33 +2407,59 @@
         let bounds = card.containerLayer.bounds
         let isSelected = card.item.window.id == effectiveSelection?.windowID
         let isHovered = card.item.window.id == hoveredWindowID
-        applyWaterfallCardVisualState(card, selected: isSelected, hovered: isHovered)
+        applyWaterfallCardVisualState(card, selected: shouldShowSelectedVisual(isSelected), hovered: isHovered)
 
-        let thumbnailWidth = max(90, min(116, bounds.width * 0.44))
-        card.thumbnailLayer.frame = CGRect(
-            x: 10,
-            y: 12,
-            width: thumbnailWidth,
-            height: bounds.height - 24
+        let outerInset: CGFloat = 8
+        let titleBarHeight: CGFloat = 26
+        let titleGap: CGFloat = 6
+        let titleBarFrame = CGRect(
+            x: outerInset,
+            y: bounds.height - outerInset - titleBarHeight,
+            width: max(1, bounds.width - outerInset * 2),
+            height: titleBarHeight
         )
-        card.appIconLayer.frame = CGRect(x: 18, y: bounds.height - 38, width: 22, height: 22)
+        let thumbnailFrame = CGRect(
+            x: outerInset,
+            y: outerInset,
+            width: max(1, bounds.width - outerInset * 2),
+            height: max(1, titleBarFrame.minY - outerInset - titleGap)
+        )
+
+        card.thumbnailLayer.frame = CGRect(
+            x: thumbnailFrame.minX,
+            y: thumbnailFrame.minY,
+            width: thumbnailFrame.width,
+            height: thumbnailFrame.height
+        )
+        card.titleBarLayer.frame = titleBarFrame
+        card.appIconLayer.frame = CGRect(x: titleBarFrame.minX + 7, y: titleBarFrame.minY + 5, width: 16, height: 16)
         card.titleLayer.frame = CGRect(
-            x: thumbnailWidth + 22,
-            y: bounds.height - 31,
-            width: max(1, bounds.width - thumbnailWidth - 34),
+            x: titleBarFrame.minX + 29,
+            y: titleBarFrame.minY + 6,
+            width: max(1, titleBarFrame.width - 68),
             height: 16
         )
         card.metaLayer.frame = CGRect(
-            x: thumbnailWidth + 22,
-            y: bounds.height - 51,
-            width: max(1, bounds.width - thumbnailWidth - 34),
+            x: titleBarFrame.maxX - 38,
+            y: titleBarFrame.minY + 6,
+            width: 30,
             height: 14
         )
         card.stateLayer.frame = CGRect(
-            x: thumbnailWidth + 22,
-            y: 12,
-            width: max(1, bounds.width - thumbnailWidth - 34),
+            x: thumbnailFrame.maxX - 86,
+            y: thumbnailFrame.minY + 6,
+            width: 78,
             height: 14
+        )
+        layoutCloseButton(
+            card.closeButton,
+            target: .window(
+                appGroupIndex: card.item.appGroupIndex,
+                windowIndex: card.item.windowIndex,
+                windowID: card.item.window.id
+            ),
+            visible: isHovered,
+            anchorTopRight: CGPoint(x: bounds.maxX - 12, y: bounds.maxY - 12)
         )
         card.shineLayer.frame = CGRect(
             x: -bounds.width * 0.18,
@@ -2131,30 +2474,471 @@
         card.containerLayer.backgroundColor = (selected
             ? NSColor.windowBackgroundColor.withAlphaComponent(0.94)
             : hovered
-                ? NSColor.systemFill.withAlphaComponent(0.13)
+                ? accentTintedWindowBackground(fraction: 0.09, alpha: 0.95)
                 : isSpaceFocused
-                    ? NSColor.windowBackgroundColor.withAlphaComponent(0.88)
+                    ? accentTintedWindowBackground(fraction: 0.10, alpha: 0.94)
                 : NSColor.windowBackgroundColor.withAlphaComponent(0.82)
         ).cgColor
         card.containerLayer.borderColor = (selected
             ? NSColor.controlAccentColor.withAlphaComponent(0.52)
             : hovered
-                ? NSColor.separatorColor.withAlphaComponent(0.46)
+                ? NSColor.controlAccentColor.withAlphaComponent(0.44)
                 : isSpaceFocused
-                    ? NSColor.separatorColor.withAlphaComponent(0.38)
+                    ? NSColor.controlAccentColor.withAlphaComponent(0.42)
                 : NSColor.separatorColor.withAlphaComponent(0.28)
         ).cgColor
-        card.containerLayer.borderWidth = selected ? 1.5 : 1
+        card.containerLayer.borderWidth = (selected || hovered || isSpaceFocused) ? 1.5 : 1
         card.containerLayer.shadowColor = NSColor.black.cgColor
-        card.containerLayer.shadowOpacity = selected ? 0.20 : hovered ? 0.08 : 0
-        card.containerLayer.shadowRadius = selected ? 18 : hovered ? 10 : 0
+        card.containerLayer.shadowOpacity = selected ? 0.24 : hovered ? 0.14 : isSpaceFocused ? 0.20 : 0
+        card.containerLayer.shadowRadius = selected ? 22 : hovered ? 17 : isSpaceFocused ? 24 : 0
         card.containerLayer.shadowOffset = selected
-            ? CGSize(width: 0, height: -5)
+            ? CGSize(width: 0, height: -6)
             : hovered
-                ? CGSize(width: 0, height: -2)
-                : .zero
-        card.containerLayer.zPosition = selected ? 20 : hovered ? 10 : 0
+                ? CGSize(width: 0, height: -2.5)
+                : isSpaceFocused
+                    ? CGSize(width: 0, height: -5)
+                    : .zero
+        card.containerLayer.zPosition = selected ? 20 : hovered ? 10 : isSpaceFocused ? 8 : 0
+        let focusedScale: CGFloat = selected ? 1.015 : isSpaceFocused ? 1.012 : 1.008
+        card.containerLayer.transform = (selected || hovered || isSpaceFocused)
+            ? CATransform3DMakeScale(focusedScale, focusedScale, 1)
+            : CATransform3DIdentity
+        card.containerLayer.shadowPath = (selected || hovered || isSpaceFocused)
+            ? CGPath(
+                roundedRect: card.containerLayer.bounds,
+                cornerWidth: card.containerLayer.cornerRadius,
+                cornerHeight: card.containerLayer.cornerRadius,
+                transform: nil
+            )
+            : nil
+        card.titleBarLayer.backgroundColor = NSColor.clear.cgColor
+        card.titleBarLayer.borderColor = NSColor.clear.cgColor
+        card.titleBarLayer.borderWidth = 0
         card.shineLayer.opacity = selected ? 1 : 0
+    }
+
+    private func layoutCloseButton(
+        _ button: CloseButtonLayers,
+        target: CloseTarget,
+        visible: Bool,
+        anchorTopRight: CGPoint
+    ) {
+        let isButtonHovered = hoveredCloseTarget == target
+        let size: CGFloat = isButtonHovered ? 24 : 18
+        let buttonFill = isButtonHovered
+            ? NSColor.systemRed.withAlphaComponent(0.94)
+            : NSColor.labelColor.withAlphaComponent(0.24)
+        let buttonStroke = isButtonHovered
+            ? NSColor.white.withAlphaComponent(0.76)
+            : NSColor.white.withAlphaComponent(0.52)
+        let glyphStroke = isButtonHovered
+            ? NSColor.white
+            : NSColor.secondaryLabelColor.withAlphaComponent(0.92)
+        button.containerLayer.frame = CGRect(
+            x: anchorTopRight.x - size / 2,
+            y: anchorTopRight.y - size / 2,
+            width: size,
+            height: size
+        )
+        button.containerLayer.cornerRadius = size / 2
+        button.containerLayer.backgroundColor = buttonFill.cgColor
+        button.containerLayer.borderColor = buttonStroke.cgColor
+        button.containerLayer.opacity = visible ? 1 : 0
+        button.containerLayer.zPosition = isButtonHovered ? 80 : 60
+        button.containerLayer.shadowOpacity = visible ? (isButtonHovered ? 0.22 : 0.07) : 0
+        button.containerLayer.shadowRadius = isButtonHovered ? 9 : 5
+        button.glyphLayer.frame = CGRect(x: 0, y: 0, width: size, height: size)
+        button.glyphLayer.lineWidth = isButtonHovered ? 2.1 : 1.7
+        button.glyphLayer.strokeColor = glyphStroke.cgColor
+        button.glyphLayer.path = closeGlyphPath(size: size, hovered: isButtonHovered)
+    }
+
+    private func closeGlyphPath(size: CGFloat, hovered: Bool) -> CGPath {
+        let inset: CGFloat = hovered ? 7.2 : 5.6
+        let path = CGMutablePath()
+        path.move(to: CGPoint(x: inset, y: inset))
+        path.addLine(to: CGPoint(x: size - inset, y: size - inset))
+        path.move(to: CGPoint(x: size - inset, y: inset))
+        path.addLine(to: CGPoint(x: inset, y: size - inset))
+        return path
+    }
+
+    private func canClose(app: AlignerApp) -> Bool {
+        guard let processIdentifier = app.processIdentifier else { return false }
+        return processIdentifier != getpid()
+    }
+
+    private func layoutCloseConfirmation() {
+        guard let pendingCloseTarget,
+              let request = closeRequest(for: pendingCloseTarget),
+              let anchor = closeConfirmationAnchor(for: pendingCloseTarget)
+        else {
+            closeConfirmationLayers.containerLayer.isHidden = true
+            closeConfirmationArrowEdge = nil
+            return
+        }
+
+        let contentWidth: CGFloat = 374
+        let height: CGFloat = 184
+        let arrowWidth: CGFloat = 14
+        let edgeMargin: CGFloat = 16
+        let anchorGap: CGFloat = 12
+        let width = contentWidth + arrowWidth
+        let availableRight = glassLayer.bounds.maxX - anchor.x - edgeMargin
+        let availableLeft = anchor.x - glassLayer.bounds.minX - edgeMargin
+        let arrowEdge: CloseConfirmationArrowEdge = availableRight >= width || availableRight >= availableLeft
+            ? .left
+            : .right
+        let preferredX = arrowEdge == .left
+            ? anchor.x + anchorGap
+            : anchor.x - width - anchorGap
+        let x = min(
+            max(edgeMargin, preferredX),
+            max(edgeMargin, glassLayer.bounds.width - width - edgeMargin)
+        )
+        let y = min(
+            max(edgeMargin, anchor.y - height + 64),
+            max(edgeMargin, glassLayer.bounds.height - height - edgeMargin)
+        )
+        let localArrowY = min(max(anchor.y - y, 38), height - 38)
+        closeConfirmationArrowEdge = arrowEdge
+
+        let layers = closeConfirmationLayers
+        layers.containerLayer.isHidden = false
+        layers.containerLayer.frame = CGRect(x: x, y: y, width: width, height: height)
+        let contentX = arrowEdge == .left ? arrowWidth : 0
+        let contentFrame = CGRect(x: contentX, y: 0, width: contentWidth, height: height)
+        let bubblePath = closeConfirmationBubblePath(
+            bounds: layers.containerLayer.bounds,
+            contentFrame: contentFrame,
+            arrowEdge: arrowEdge,
+            arrowY: localArrowY
+        )
+        layers.backgroundLayer.frame = layers.containerLayer.bounds
+        layers.backgroundLayer.path = bubblePath
+        layers.containerLayer.shadowPath = bubblePath
+        layers.titleLayer.string = confirmationTitle(for: request)
+        layers.messageLayer.string = confirmationMessage(for: request)
+        layers.titleLayer.frame = CGRect(x: contentFrame.minX + 22, y: height - 48, width: contentFrame.width - 44, height: 22)
+        layers.messageLayer.frame = CGRect(x: contentFrame.minX + 22, y: height - 78, width: contentFrame.width - 44, height: 21)
+
+        layers.checkboxLayer.frame = CGRect(x: contentFrame.minX + 22, y: 80, width: 18, height: 18)
+        layers.checkboxLayer.backgroundColor = (pendingCloseOptOut
+            ? NSColor.controlAccentColor.withAlphaComponent(0.92)
+            : NSColor.clear
+        ).cgColor
+        layers.checkboxLayer.borderColor = (pendingCloseOptOut
+            ? NSColor.controlAccentColor.withAlphaComponent(0.95)
+            : NSColor.separatorColor.withAlphaComponent(0.48)
+        ).cgColor
+        layers.checkboxMarkLayer.string = pendingCloseOptOut ? "✓" : ""
+        layers.checkboxMarkLayer.frame = CGRect(x: 0, y: 1, width: 18, height: 16)
+        layers.checkboxLabelLayer.frame = CGRect(x: contentFrame.minX + 48, y: 80, width: contentFrame.width - 70, height: 19)
+
+        layers.cancelButtonLayer.frame = CGRect(x: contentFrame.maxX - 164, y: 22, width: 74, height: 32)
+        layers.cancelButtonTextLayer.frame = layers.cancelButtonLayer.bounds.insetBy(dx: 0, dy: 7)
+        layers.confirmButtonLayer.frame = CGRect(x: contentFrame.maxX - 78, y: 22, width: 56, height: 32)
+        layers.confirmButtonTextLayer.frame = layers.confirmButtonLayer.bounds.insetBy(dx: 0, dy: 7)
+    }
+
+    private func closeConfirmationBubblePath(
+        bounds: CGRect,
+        contentFrame: CGRect,
+        arrowEdge: CloseConfirmationArrowEdge,
+        arrowY: CGFloat
+    ) -> CGPath {
+        let cornerRadius: CGFloat = 18
+        let arrowHalfHeight: CGFloat = 10
+        let path = CGMutablePath()
+        let minX = contentFrame.minX
+        let maxX = contentFrame.maxX
+        let minY = contentFrame.minY
+        let maxY = contentFrame.maxY
+        let arrowY = min(max(arrowY, minY + cornerRadius + arrowHalfHeight + 4), maxY - cornerRadius - arrowHalfHeight - 4)
+
+        path.move(to: CGPoint(x: minX + cornerRadius, y: minY))
+        path.addLine(to: CGPoint(x: maxX - cornerRadius, y: minY))
+        path.addQuadCurve(to: CGPoint(x: maxX, y: minY + cornerRadius), control: CGPoint(x: maxX, y: minY))
+
+        if arrowEdge == .right {
+            path.addLine(to: CGPoint(x: maxX, y: arrowY - arrowHalfHeight))
+            path.addLine(to: CGPoint(x: bounds.maxX, y: arrowY))
+            path.addLine(to: CGPoint(x: maxX, y: arrowY + arrowHalfHeight))
+        }
+
+        path.addLine(to: CGPoint(x: maxX, y: maxY - cornerRadius))
+        path.addQuadCurve(to: CGPoint(x: maxX - cornerRadius, y: maxY), control: CGPoint(x: maxX, y: maxY))
+        path.addLine(to: CGPoint(x: minX + cornerRadius, y: maxY))
+        path.addQuadCurve(to: CGPoint(x: minX, y: maxY - cornerRadius), control: CGPoint(x: minX, y: maxY))
+
+        if arrowEdge == .left {
+            path.addLine(to: CGPoint(x: minX, y: arrowY + arrowHalfHeight))
+            path.addLine(to: CGPoint(x: bounds.minX, y: arrowY))
+            path.addLine(to: CGPoint(x: minX, y: arrowY - arrowHalfHeight))
+        }
+
+        path.addLine(to: CGPoint(x: minX, y: minY + cornerRadius))
+        path.addQuadCurve(to: CGPoint(x: minX + cornerRadius, y: minY), control: CGPoint(x: minX, y: minY))
+        path.closeSubpath()
+        return path
+    }
+
+    private func confirmationTitle(for request: QuickSwitchCloseRequest) -> String {
+        switch request {
+        case .app:
+            return "关闭 \(request.appName)?"
+        case .window:
+            return "关闭这个窗口?"
+        }
+    }
+
+    private func confirmationMessage(for request: QuickSwitchCloseRequest) -> String {
+        switch request {
+        case .app:
+            return "将退出该应用,并一次性关闭它的所有窗口。"
+        case .window:
+            return "将关闭此窗口,未保存内容可能需要应用确认。"
+        }
+    }
+
+    private func closeRequest(for target: CloseTarget) -> QuickSwitchCloseRequest? {
+        switch target {
+        case .app(let appGroupIndex):
+            return appShelfItems
+                .first { $0.item.appGroupIndex == appGroupIndex }
+                .map { .app($0.item) }
+        case .window(let appGroupIndex, let windowIndex, let windowID):
+            guard let card = waterfallCard(appGroupIndex: appGroupIndex, windowIndex: windowIndex),
+                  card.item.window.id == windowID
+            else {
+                return nil
+            }
+            return .window(card.item)
+        }
+    }
+
+    private func requestClose(for target: CloseTarget) {
+        guard let request = closeRequest(for: target) else {
+            DevelopmentDiagnostics.log("quickSwitch.view.closeRequest.missingTarget", [
+                "targetKind": target.kindDescription
+            ])
+            return
+        }
+
+        pendingCloseTarget = nil
+        pendingCloseOptOut = false
+        closeConfirmationLayers.containerLayer.isHidden = true
+        closeConfirmationArrowEdge = nil
+        if pendingCloseOptOut {
+            onCloseConfirmationDisabled?()
+        }
+        onRequestClose?(request)
+    }
+
+    private func beginCloseConfirmation(for target: CloseTarget) {
+        if closeConfirmationRequired {
+            pendingCloseTarget = target
+            pendingCloseOptOut = false
+            DevelopmentDiagnostics.log("quickSwitch.view.closeConfirmation.show", [
+                "targetKind": target.kindDescription
+            ])
+            needsLayout = true
+            return
+        }
+
+        requestClose(for: target)
+    }
+
+    private func confirmPendingClose() {
+        guard let target = pendingCloseTarget else { return }
+        let shouldDisableConfirmation = pendingCloseOptOut
+        pendingCloseTarget = nil
+        pendingCloseOptOut = false
+        closeConfirmationLayers.containerLayer.isHidden = true
+        closeConfirmationArrowEdge = nil
+        if shouldDisableConfirmation {
+            onCloseConfirmationDisabled?()
+        }
+        if let request = closeRequest(for: target) {
+            onRequestClose?(request)
+        }
+    }
+
+    private func cancelPendingClose() {
+        DevelopmentDiagnostics.log("quickSwitch.view.closeConfirmation.cancel")
+        pendingCloseTarget = nil
+        pendingCloseOptOut = false
+        closeConfirmationLayers.containerLayer.isHidden = true
+        closeConfirmationArrowEdge = nil
+        needsLayout = true
+    }
+
+    private func toggleCloseConfirmationOptOut() {
+        pendingCloseOptOut.toggle()
+        needsLayout = true
+    }
+
+    private enum CloseConfirmationHit {
+        case confirm
+        case cancel
+        case checkbox
+        case background
+        case outside
+    }
+
+    private func closeConfirmationHit(at windowLocation: NSPoint) -> CloseConfirmationHit {
+        let location = convert(windowLocation, from: nil)
+        let locationInGlass = CGPoint(
+            x: location.x - glassLayer.frame.minX,
+            y: location.y - glassLayer.frame.minY
+        )
+        let layers = closeConfirmationLayers
+        guard !layers.containerLayer.isHidden else { return .outside }
+        guard layers.containerLayer.frame.contains(locationInGlass) else { return .outside }
+
+        let local = CGPoint(
+            x: locationInGlass.x - layers.containerLayer.frame.minX,
+            y: locationInGlass.y - layers.containerLayer.frame.minY
+        )
+        if layers.confirmButtonLayer.frame.contains(local) {
+            return .confirm
+        }
+        if layers.cancelButtonLayer.frame.contains(local) {
+            return .cancel
+        }
+        let checkboxHitFrame = layers.checkboxLayer.frame.union(layers.checkboxLabelLayer.frame).insetBy(dx: -6, dy: -4)
+        if checkboxHitFrame.contains(local) {
+            return .checkbox
+        }
+        return .background
+    }
+
+    private func handleCloseConfirmationMouseDown(at windowLocation: NSPoint) -> Bool {
+        switch closeConfirmationHit(at: windowLocation) {
+        case .confirm:
+            confirmPendingClose()
+            return true
+        case .cancel:
+            cancelPendingClose()
+            return true
+        case .checkbox:
+            toggleCloseConfirmationOptOut()
+            return true
+        case .background:
+            return true
+        case .outside:
+            if pendingCloseTarget != nil {
+                cancelPendingClose()
+                return true
+            }
+            return false
+        }
+    }
+
+    private func closeButtonTarget(at windowLocation: NSPoint) -> CloseTarget? {
+        if let target = appShelfCloseButtonTarget(at: windowLocation) {
+            return target
+        }
+        return waterfallCloseButtonTarget(at: windowLocation)
+    }
+
+    private func appShelfCloseButtonTarget(at windowLocation: NSPoint) -> CloseTarget? {
+        let locationInView = convert(windowLocation, from: nil)
+        let locationInAppShelfContent = CGPoint(
+            x: locationInView.x - glassLayer.frame.minX - shelfLayer.frame.minX - appShelfContentLayer.frame.minX,
+            y: locationInView.y - glassLayer.frame.minY - shelfLayer.frame.minY - appShelfContentLayer.frame.minY
+        )
+
+        for item in appShelfItems {
+            let target = CloseTarget.app(appGroupIndex: item.item.appGroupIndex)
+            guard item.closeButton.containerLayer.opacity > 0,
+                  canClose(app: item.item.app)
+            else { continue }
+
+            let locationInItem = CGPoint(
+                x: locationInAppShelfContent.x - item.containerLayer.frame.minX,
+                y: locationInAppShelfContent.y - item.containerLayer.frame.minY
+            )
+            if item.closeButton.containerLayer.frame.insetBy(dx: -8, dy: -8).contains(locationInItem) {
+                return target
+            }
+        }
+        return nil
+    }
+
+    private func waterfallCloseButtonTarget(at windowLocation: NSPoint) -> CloseTarget? {
+        let locationInView = convert(windowLocation, from: nil)
+        let locationInWaterfallContent = CGPoint(
+            x: locationInView.x - glassLayer.frame.minX - waterfallLayer.frame.minX - waterfallContentLayer.frame.minX,
+            y: locationInView.y - glassLayer.frame.minY - waterfallLayer.frame.minY - waterfallContentLayer.frame.minY
+        )
+
+        for column in waterfallColumns where column.containerLayer.frame.contains(locationInWaterfallContent) {
+            let locationInColumn = CGPoint(
+                x: locationInWaterfallContent.x - column.containerLayer.frame.minX,
+                y: locationInWaterfallContent.y - column.containerLayer.frame.minY
+            )
+            for card in column.cards where card.containerLayer.frame.contains(locationInColumn) {
+                guard card.closeButton.containerLayer.opacity > 0 else { continue }
+                let locationInCard = CGPoint(
+                    x: locationInColumn.x - card.containerLayer.frame.minX,
+                    y: locationInColumn.y - card.containerLayer.frame.minY
+                )
+                if card.closeButton.containerLayer.frame.insetBy(dx: -8, dy: -8).contains(locationInCard) {
+                    return .window(
+                        appGroupIndex: card.item.appGroupIndex,
+                        windowIndex: card.item.windowIndex,
+                        windowID: card.item.window.id
+                    )
+                }
+            }
+        }
+        return nil
+    }
+
+    private func closeConfirmationAnchor(for target: CloseTarget) -> CGPoint? {
+        switch target {
+        case .app(let appGroupIndex):
+            guard let item = appShelfItems.first(where: { $0.item.appGroupIndex == appGroupIndex }) else {
+                return nil
+            }
+            return CGPoint(
+                x: shelfLayer.frame.minX
+                    + appShelfContentLayer.frame.minX
+                    + item.containerLayer.frame.minX
+                    + item.closeButton.containerLayer.frame.midX,
+                y: shelfLayer.frame.minY
+                    + appShelfContentLayer.frame.minY
+                    + item.containerLayer.frame.minY
+                    + item.closeButton.containerLayer.frame.midY
+            )
+        case .window(let appGroupIndex, let windowIndex, let windowID):
+            guard let column = waterfallColumns.first(where: { $0.column.appGroupIndex == appGroupIndex }),
+                  let card = column.cards.first(where: {
+                      $0.item.windowIndex == windowIndex && $0.item.window.id == windowID
+                  })
+            else {
+                return nil
+            }
+            return CGPoint(
+                x: waterfallLayer.frame.minX
+                    + waterfallContentLayer.frame.minX
+                    + column.containerLayer.frame.minX
+                    + card.containerLayer.frame.minX
+                    + card.closeButton.containerLayer.frame.midX,
+                y: waterfallLayer.frame.minY
+                    + waterfallContentLayer.frame.minY
+                    + column.containerLayer.frame.minY
+                    + card.containerLayer.frame.minY
+                    + card.closeButton.containerLayer.frame.midY
+            )
+        }
+    }
+
+    private func accentTintedWindowBackground(fraction: CGFloat, alpha: CGFloat) -> NSColor {
+        let color = NSColor.windowBackgroundColor.blended(withFraction: fraction, of: NSColor.controlAccentColor)
+            ?? NSColor.windowBackgroundColor
+        return color.withAlphaComponent(alpha)
     }
 
     private func waterfallColumnWidth() -> CGFloat {
@@ -2235,10 +3019,13 @@
     private func makeFullscreenMarkerLayer(for space: QuickSwitchSpaceViewModel) -> CALayer? {
         guard space.type == .fullscreen else { return nil }
 
-        let layer = CALayer()
-        layer.cornerRadius = 1.5
-        layer.backgroundColor = NSColor.secondaryLabelColor.withAlphaComponent(space.isCurrent ? 0.46 : 0.32).cgColor
-        return layer
+        let shapeLayer = CAShapeLayer()
+        shapeLayer.fillColor = NSColor.clear.cgColor
+        shapeLayer.strokeColor = NSColor.secondaryLabelColor.withAlphaComponent(space.isCurrent ? 0.42 : 0.28).cgColor
+        shapeLayer.lineWidth = 1.2
+        shapeLayer.lineCap = .round
+        shapeLayer.lineJoin = .round
+        return shapeLayer
     }
 
     private func makeTextLayer(
@@ -2259,6 +3046,133 @@
         return textLayer
     }
 
+    private func makeCloseButtonLayers() -> CloseButtonLayers {
+        let container = CALayer()
+        container.cornerRadius = 8
+        container.masksToBounds = false
+        container.backgroundColor = NSColor.systemRed.withAlphaComponent(0.92).cgColor
+        container.borderColor = NSColor.white.withAlphaComponent(0.72).cgColor
+        container.borderWidth = 0.8
+        container.shadowColor = NSColor.black.cgColor
+        container.shadowOpacity = 0.14
+        container.shadowRadius = 5
+        container.shadowOffset = CGSize(width: 0, height: -1)
+        container.opacity = 0
+
+        let glyph = CAShapeLayer()
+        glyph.contentsScale = backingScaleFactor
+        glyph.strokeColor = NSColor.white.cgColor
+        glyph.fillColor = NSColor.clear.cgColor
+        glyph.lineCap = .round
+        glyph.lineJoin = .round
+        container.addSublayer(glyph)
+
+        return CloseButtonLayers(containerLayer: container, glyphLayer: glyph)
+    }
+
+    private func makeCloseConfirmationLayers() -> CloseConfirmationLayers {
+        let container = CALayer()
+        container.masksToBounds = false
+        container.backgroundColor = NSColor.clear.cgColor
+        container.shadowColor = NSColor.black.cgColor
+        container.shadowOpacity = 0.20
+        container.shadowRadius = 20
+        container.shadowOffset = CGSize(width: 0, height: -8)
+        container.zPosition = 200
+
+        let background = CAShapeLayer()
+        background.contentsScale = backingScaleFactor
+        background.fillColor = NSColor.windowBackgroundColor.withAlphaComponent(0.985).cgColor
+        background.strokeColor = NSColor.separatorColor.withAlphaComponent(0.36).cgColor
+        background.lineWidth = 1
+
+        let title = makeTextLayer(
+            string: "",
+            fontSize: 15,
+            weight: .semibold,
+            color: .labelColor
+        )
+        let message = makeTextLayer(
+            string: "",
+            fontSize: 13,
+            weight: .regular,
+            color: .secondaryLabelColor
+        )
+        message.truncationMode = .end
+
+        let checkbox = CALayer()
+        checkbox.cornerRadius = 4
+        checkbox.borderWidth = 1
+        checkbox.borderColor = NSColor.separatorColor.withAlphaComponent(0.48).cgColor
+        checkbox.backgroundColor = NSColor.clear.cgColor
+
+        let checkmark = makeTextLayer(
+            string: "",
+            fontSize: 11,
+            weight: .bold,
+            color: .white,
+            alignment: .center
+        )
+
+        let checkboxLabel = makeTextLayer(
+            string: "以后不再提醒",
+            fontSize: 13,
+            weight: .regular,
+            color: .secondaryLabelColor
+        )
+
+        let confirmButton = CALayer()
+        confirmButton.cornerRadius = 7
+        confirmButton.backgroundColor = NSColor.systemRed.withAlphaComponent(0.94).cgColor
+
+        let confirmText = makeTextLayer(
+            string: "关闭",
+            fontSize: 13,
+            weight: .semibold,
+            color: .white,
+            alignment: .center
+        )
+
+        let cancelButton = CALayer()
+        cancelButton.cornerRadius = 7
+        cancelButton.backgroundColor = NSColor.systemFill.withAlphaComponent(0.16).cgColor
+        cancelButton.borderColor = NSColor.separatorColor.withAlphaComponent(0.22).cgColor
+        cancelButton.borderWidth = 1
+
+        let cancelText = makeTextLayer(
+            string: "取消",
+            fontSize: 13,
+            weight: .medium,
+            color: .labelColor,
+            alignment: .center
+        )
+
+        container.addSublayer(background)
+        container.addSublayer(title)
+        container.addSublayer(message)
+        container.addSublayer(checkbox)
+        checkbox.addSublayer(checkmark)
+        container.addSublayer(checkboxLabel)
+        container.addSublayer(confirmButton)
+        confirmButton.addSublayer(confirmText)
+        container.addSublayer(cancelButton)
+        cancelButton.addSublayer(cancelText)
+
+        return CloseConfirmationLayers(
+            containerLayer: container,
+            backgroundLayer: background,
+            titleLayer: title,
+            messageLayer: message,
+            checkboxLayer: checkbox,
+            checkboxMarkLayer: checkmark,
+            checkboxLabelLayer: checkboxLabel,
+            confirmButtonLayer: confirmButton,
+            confirmButtonTextLayer: confirmText,
+            cancelButtonLayer: cancelButton,
+            cancelButtonTextLayer: cancelText
+        )
+    }
+
     private func makeWindowBlocks(count: Int, space: QuickSwitchSpaceViewModel) -> [CALayer] {
         guard count > 0 else { return [] }
 
@@ -2273,17 +3187,61 @@
         }
     }
 
-    private func appIdentifierText(for appNames: [String]) -> String {
-        var identifiers = appNames.prefix(3).compactMap { name -> String? in
+    private func appIdentifierText(for space: QuickSwitchSpaceViewModel) -> String {
+        if space.type == .fullscreen,
+           let appName = space.appNames.first?.trimmingCharacters(in: .whitespacesAndNewlines),
+           !appName.isEmpty {
+            return appName
+        }
+
+        var identifiers = space.appNames.prefix(3).compactMap { name -> String? in
             let trimmed = name.trimmingCharacters(in: .whitespacesAndNewlines)
             return trimmed.first.map { String($0) }
         }
 
-        if appNames.count > 3 {
-            identifiers.append("+\(appNames.count - 3)")
+        if space.appNames.count > 3 {
+            identifiers.append("+\(space.appNames.count - 3)")
         }
 
         return identifiers.joined(separator: " ")
+    }
+
+    private func layoutFullscreenMarkerLayer(_ layer: CALayer, in segmentBounds: CGRect) {
+        let markerFrame = fullscreenMarkerFrame(in: segmentBounds)
+        layer.frame = markerFrame
+
+        guard let shapeLayer = layer as? CAShapeLayer else { return }
+
+        let bounds = shapeLayer.bounds
+        let cornerLength = min(12, max(7, min(bounds.width, bounds.height) * 0.28))
+        let path = CGMutablePath()
+
+        path.move(to: CGPoint(x: 0, y: cornerLength))
+        path.addLine(to: CGPoint(x: 0, y: 0))
+        path.addLine(to: CGPoint(x: cornerLength, y: 0))
+
+        path.move(to: CGPoint(x: bounds.maxX - cornerLength, y: 0))
+        path.addLine(to: CGPoint(x: bounds.maxX, y: 0))
+        path.addLine(to: CGPoint(x: bounds.maxX, y: cornerLength))
+
+        path.move(to: CGPoint(x: bounds.maxX, y: bounds.maxY - cornerLength))
+        path.addLine(to: CGPoint(x: bounds.maxX, y: bounds.maxY))
+        path.addLine(to: CGPoint(x: bounds.maxX - cornerLength, y: bounds.maxY))
+
+        path.move(to: CGPoint(x: cornerLength, y: bounds.maxY))
+        path.addLine(to: CGPoint(x: 0, y: bounds.maxY))
+        path.addLine(to: CGPoint(x: 0, y: bounds.maxY - cornerLength))
+
+        shapeLayer.path = path
+    }
+
+    private func fullscreenMarkerFrame(in segmentBounds: CGRect) -> CGRect {
+        CGRect(
+            x: 10,
+            y: 30,
+            width: max(1, segmentBounds.width - 20),
+            height: max(1, segmentBounds.height - 58)
+        )
     }
 
     private func columnSelectionHistoryReports() -> [[String: Int]] {
@@ -2320,15 +3278,22 @@
                 "labelFrame": dictionary(from: item.labelLayer.frame),
                 "labelTruncationMode": "middle",
                 "badgeVisible": !item.badgeLayer.isHidden,
-                "badgeText": item.badgeLayer.string ?? ""
+                "badgeText": item.badgeLayer.string ?? "",
+                "closeButtonVisible": item.closeButton.containerLayer.opacity > 0,
+                "closeButtonFrame": dictionary(from: item.closeButton.containerLayer.frame),
+                "closeButtonSize": Double(item.closeButton.containerLayer.bounds.width),
+                "closeButtonFillColor": colorDictionary(from: item.closeButton.containerLayer.backgroundColor)
             ] as [String: Any]
         }
     }
 
     private func appShelfVisualStates(for item: AppShelfItemLayers) -> [String] {
         var states: [String] = []
-        if item.item.appGroupIndex == effectiveSelection?.appGroupIndex {
+        let isSelected = item.item.appGroupIndex == effectiveSelection?.appGroupIndex
+        if shouldShowSelectedVisual(isSelected) {
             states.append("selected")
+        } else if isSelected {
+            states.append("selectedVisualSuppressed")
         }
         if item.item.appGroupIndex == effectiveHoveredAppGroupIndex {
             states.append("hover")
@@ -2439,8 +3404,20 @@
                 "screenshotSource": screenshotSourceString(screenshotSource, for: card.item.window),
                 "screenshotFallbackReason": screenshotFallbackReasonString(screenshotSource),
                 "screenshotNotRequestedReason": screenshotSkippedReasonsByWindowID[card.item.window.id] ?? NSNull(),
+                "backgroundColor": colorDictionary(from: card.containerLayer.backgroundColor),
+                "shadowOpacity": Double(card.containerLayer.shadowOpacity),
+                "shadowRadius": Double(card.containerLayer.shadowRadius),
                 "thumbnailFrame": dictionary(from: card.thumbnailLayer.frame),
+                "titleBarFrame": dictionary(from: card.titleBarLayer.frame),
+                "titleBarBorderWidth": Double(card.titleBarLayer.borderWidth),
+                "titleFrame": dictionary(from: card.titleLayer.frame),
+                "metaFrame": dictionary(from: card.metaLayer.frame),
                 "appIconFrame": dictionary(from: card.appIconLayer.frame),
+                "stateFrame": dictionary(from: card.stateLayer.frame),
+                "closeButtonVisible": card.closeButton.containerLayer.opacity > 0,
+                "closeButtonFrame": dictionary(from: card.closeButton.containerLayer.frame),
+                "closeButtonSize": Double(card.closeButton.containerLayer.bounds.width),
+                "closeButtonFillColor": colorDictionary(from: card.closeButton.containerLayer.backgroundColor),
                 "shineVisible": card.shineLayer.opacity > 0,
                 "zPosition": Double(card.containerLayer.zPosition),
                 "frame": dictionary(from: card.containerLayer.frame),
@@ -2535,8 +3512,11 @@
 
     private func waterfallCardVisualStates(for card: WaterfallCardLayers) -> [String] {
         var states: [String] = []
-        if card.item.window.id == effectiveSelection?.windowID {
+        let isSelected = card.item.window.id == effectiveSelection?.windowID
+        if shouldShowSelectedVisual(isSelected) {
             states.append("selected")
+        } else if isSelected {
+            states.append("selectedVisualSuppressed")
         }
         if card.item.window.id == hoveredWindowID {
             states.append("hover")
@@ -2571,6 +3551,13 @@
                     "type": spaceTypeName(space.type),
                     "visualStates": visualStates(for: space),
                     "fullscreenMarkerVisible": segment.fullscreenMarkerLayer != nil,
+                    "fullscreenMarkerKind": segment.fullscreenMarkerLayer == nil ? "none" : "cornerBracket",
+                    "fullscreenMarkerFrame": segment.fullscreenMarkerLayer.map { dictionary(from: $0.frame) } ?? NSNull(),
+                    "windowBlockCount": segment.windowBlocks.count,
+                    "backgroundColor": colorDictionary(from: segment.containerLayer.backgroundColor),
+                    "shadowOpacity": Double(segment.containerLayer.shadowOpacity),
+                    "shadowRadius": Double(segment.containerLayer.shadowRadius),
+                    "appFrame": dictionary(from: segment.appLayer.frame),
                     "frame": dictionary(from: segment.containerLayer.frame),
                     "visibleFrame": dictionary(from: visibleFrame),
                     "isCurrent": space.isCurrent,
@@ -2622,4 +3609,24 @@
             "height": Double(rect.height)
         ]
     }
+
+    private func colorDictionary(from color: CGColor?) -> [String: Double] {
+        guard let color,
+              let nsColor = NSColor(cgColor: color)?.usingColorSpace(.deviceRGB)
+        else {
+            return [
+                "red": 0,
+                "green": 0,
+                "blue": 0,
+                "alpha": 0
+            ]
+        }
+
+        return [
+            "red": Double(nsColor.redComponent),
+            "green": Double(nsColor.greenComponent),
+            "blue": Double(nsColor.blueComponent),
+            "alpha": Double(nsColor.alphaComponent)
+        ]
+    }
 }

--
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