diff --git a/Sources/ContentView.swift b/Sources/ContentView.swift
index 6a9f9fd6..6b6eeb1d 100644
--- a/Sources/ContentView.swift
+++ b/Sources/ContentView.swift
@@ -6437,6 +6437,10 @@ private struct TabItemView: View {
         usesInvertedActiveForeground ? Color.white.opacity(0.8) : cmuxAccentColor()
     }
 
+    private var activeSelectionColor: Color {
+        resolvedCustomTabColor ?? Color(nsColor: sidebarSelectedWorkspaceBackgroundNSColor(for: colorScheme))
+    }
+
     private var shortcutHintEmphasis: Double {
         usesInvertedActiveForeground ? 1.0 : 0.9
     }
@@ -6491,6 +6495,7 @@ private struct TabItemView: View {
                         .foregroundColor(activeSecondaryColor(0.8))
                 }
 
+
                 Text(tab.title)
                     .font(.system(size: 12.5, weight: titleFontWeight))
                     .foregroundColor(activePrimaryTextColor)
@@ -6948,11 +6953,11 @@ private struct TabItemView: View {
     private var backgroundColor: Color {
         switch activeTabIndicatorStyle {
         case .leftRail:
-            if isActive        { return Color(nsColor: sidebarSelectedWorkspaceBackgroundNSColor(for: colorScheme)) }
+            if isActive        { return activeSelectionColor }
             if isMultiSelected { return cmuxAccentColor().opacity(0.25) }
             return Color.clear
         case .solidFill:
-            if isActive { return Color(nsColor: sidebarSelectedWorkspaceBackgroundNSColor(for: colorScheme)) }
+            if isActive { return activeSelectionColor }
             if let custom = resolvedCustomTabColor {
                 if isMultiSelected { return custom.opacity(0.35) }
                 return custom.opacity(0.7)
diff --git a/Sources/GhosttyTerminalView.swift b/Sources/GhosttyTerminalView.swift
index efdb0fe4..ee1a7616 100644
--- a/Sources/GhosttyTerminalView.swift
+++ b/Sources/GhosttyTerminalView.swift
@@ -3951,11 +3951,11 @@ final class GhosttySurfaceScrollView: NSView {
         notificationRingOverlayView.layer?.masksToBounds = false
         notificationRingOverlayView.autoresizingMask = [.width, .height]
         notificationRingLayer.fillColor = NSColor.clear.cgColor
-        notificationRingLayer.strokeColor = NSColor.systemBlue.cgColor
+        notificationRingLayer.strokeColor = cmuxAccentNSColor().cgColor
         notificationRingLayer.lineWidth = 2.5
         notificationRingLayer.lineJoin = .round
         notificationRingLayer.lineCap = .round
-        notificationRingLayer.shadowColor = NSColor.systemBlue.cgColor
+        notificationRingLayer.shadowColor = cmuxAccentNSColor().cgColor
         notificationRingLayer.shadowOpacity = 0.35
         notificationRingLayer.shadowRadius = 3
         notificationRingLayer.shadowOffset = .zero
@@ -3968,11 +3968,11 @@ final class GhosttySurfaceScrollView: NSView {
         flashOverlayView.layer?.masksToBounds = false
         flashOverlayView.autoresizingMask = [.width, .height]
         flashLayer.fillColor = NSColor.clear.cgColor
-        flashLayer.strokeColor = NSColor.systemBlue.cgColor
+        flashLayer.strokeColor = cmuxAccentNSColor().cgColor
         flashLayer.lineWidth = 3
         flashLayer.lineJoin = .round
         flashLayer.lineCap = .round
-        flashLayer.shadowColor = NSColor.systemBlue.cgColor
+        flashLayer.shadowColor = cmuxAccentNSColor().cgColor
         flashLayer.shadowOpacity = 0.6
         flashLayer.shadowRadius = 6
         flashLayer.shadowOffset = .zero
@@ -4145,6 +4145,27 @@ final class GhosttySurfaceScrollView: NSView {
         surfaceView.onTriggerFlash = handler
     }
 
+    private func resolvedWorkspaceFocusFlashColor() -> NSColor {
+        guard let tabId = surfaceView.tabId,
+              let app = AppDelegate.shared,
+              let manager = app.tabManagerFor(tabId: tabId) ?? app.tabManager,
+              let workspace = manager.tabs.first(where: { $0.id == tabId }) else {
+            return cmuxAccentNSColor()
+        }
+        return Workspace.resolvedFocusFlashColor(customColorHex: workspace.customColor)
+    }
+
+    private func setFocusFlashColor(_ color: NSColor?) {
+        let resolved = color ?? resolvedWorkspaceFocusFlashColor()
+        CATransaction.begin()
+        CATransaction.setDisableActions(true)
+        notificationRingLayer.strokeColor = resolved.cgColor
+        notificationRingLayer.shadowColor = resolved.cgColor
+        flashLayer.strokeColor = resolved.cgColor
+        flashLayer.shadowColor = resolved.cgColor
+        CATransaction.commit()
+    }
+
     func setBackgroundColor(_ color: NSColor) {
         guard let layer = backgroundView.layer else { return }
         CATransaction.begin()
@@ -4170,6 +4191,7 @@ final class GhosttySurfaceScrollView: NSView {
             return
         }
 
+        setFocusFlashColor(nil)
         CATransaction.begin()
         CATransaction.setDisableActions(true)
         notificationRingOverlayView.isHidden = !visible
@@ -4392,7 +4414,7 @@ final class GhosttySurfaceScrollView: NSView {
     }
 #endif
 
-    func triggerFlash() {
+    func triggerFlash(color: NSColor? = nil) {
         DispatchQueue.main.async { [weak self] in
             guard let self else { return }
 #if DEBUG
@@ -4400,6 +4422,7 @@ final class GhosttySurfaceScrollView: NSView {
                 Self.recordFlash(for: surfaceId)
             }
 #endif
+            self.setFocusFlashColor(color)
             self.updateFlashPath()
             self.flashLayer.removeAllAnimations()
             self.flashLayer.opacity = 0
diff --git a/Sources/Panels/BrowserPanel.swift b/Sources/Panels/BrowserPanel.swift
index 9188d093..7135ffe3 100644
--- a/Sources/Panels/BrowserPanel.swift
+++ b/Sources/Panels/BrowserPanel.swift
@@ -1313,6 +1313,7 @@ final class BrowserPanel: Panel, ObservableObject {
 
     /// Increment to request a UI-only flash highlight (e.g. from a keyboard shortcut).
     @Published private(set) var focusFlashToken: Int = 0
+    @Published private(set) var focusFlashColor: NSColor = cmuxAccentNSColor()
 
     /// Sticky omnibar-focus intent. This survives view mount timing races and is
     /// cleared only after BrowserPanelView acknowledges handling it.
@@ -1520,7 +1521,8 @@ final class BrowserPanel: Panel, ObservableObject {
         workspaceId = newWorkspaceId
     }
 
-    func triggerFlash() {
+    func triggerFlash(color: NSColor? = nil) {
+        focusFlashColor = color ?? cmuxAccentNSColor()
         focusFlashToken &+= 1
     }
 
diff --git a/Sources/Panels/BrowserPanelView.swift b/Sources/Panels/BrowserPanelView.swift
index ea282f33..fbcc815a 100644
--- a/Sources/Panels/BrowserPanelView.swift
+++ b/Sources/Panels/BrowserPanelView.swift
@@ -296,6 +296,10 @@ struct BrowserPanelView: View {
         )
     }
 
+    private var focusFlashColor: Color {
+        Color(nsColor: panel.focusFlashColor)
+    }
+
     var body: some View {
         VStack(spacing: 0) {
             addressBar
@@ -303,8 +307,8 @@ struct BrowserPanelView: View {
         }
         .overlay {
             RoundedRectangle(cornerRadius: FocusFlashPattern.ringCornerRadius)
-                .stroke(cmuxAccentColor().opacity(focusFlashOpacity), lineWidth: 3)
-                .shadow(color: cmuxAccentColor().opacity(focusFlashOpacity * 0.35), radius: 10)
+                .stroke(focusFlashColor.opacity(focusFlashOpacity), lineWidth: 3)
+                .shadow(color: focusFlashColor.opacity(focusFlashOpacity * 0.35), radius: 10)
                 .padding(FocusFlashPattern.ringInset)
                 .allowsHitTesting(false)
         }
diff --git a/Sources/Panels/Panel.swift b/Sources/Panels/Panel.swift
index a0a719c4..b3dac0fe 100644
--- a/Sources/Panels/Panel.swift
+++ b/Sources/Panels/Panel.swift
@@ -1,5 +1,6 @@
 import Foundation
 import Combine
+import AppKit
 
 /// Type of panel content
 public enum PanelType: String, Codable, Sendable {
@@ -70,7 +71,8 @@ public protocol Panel: AnyObject, Identifiable, ObservableObject where ID == UUI
     func unfocus()
 
     /// Trigger a focus flash animation for this panel.
-    func triggerFlash()
+    /// - Parameter color: Optional override color for this flash.
+    func triggerFlash(color: NSColor?)
 }
 
 /// Extension providing default implementations
diff --git a/Sources/Panels/TerminalPanel.swift b/Sources/Panels/TerminalPanel.swift
index c8ba8507..08104709 100644
--- a/Sources/Panels/TerminalPanel.swift
+++ b/Sources/Panels/TerminalPanel.swift
@@ -166,8 +166,8 @@ final class TerminalPanel: Panel, ObservableObject {
         surface.needsConfirmClose()
     }
 
-    func triggerFlash() {
-        hostedView.triggerFlash()
+    func triggerFlash(color: NSColor? = nil) {
+        hostedView.triggerFlash(color: color)
     }
 
     func applyWindowBackgroundIfActive() {
diff --git a/Sources/Workspace.swift b/Sources/Workspace.swift
index 4844d501..fc43ab46 100644
--- a/Sources/Workspace.swift
+++ b/Sources/Workspace.swift
@@ -2934,8 +2934,23 @@ final class Workspace: Identifiable, ObservableObject {
 
     // MARK: - Flash/Notification Support
 
+    nonisolated static func resolvedFocusFlashColor(
+        customColorHex: String?,
+        fallback: NSColor = cmuxAccentNSColor()
+    ) -> NSColor {
+        guard let normalizedHex = customColorHex.flatMap(WorkspaceTabColorSettings.normalizedHex),
+              let color = NSColor(hex: normalizedHex) else {
+            return fallback
+        }
+        return color
+    }
+
+    private var focusFlashColor: NSColor {
+        Self.resolvedFocusFlashColor(customColorHex: customColor)
+    }
+
     func triggerFocusFlash(panelId: UUID) {
-        panels[panelId]?.triggerFlash()
+        panels[panelId]?.triggerFlash(color: focusFlashColor)
     }
 
     func triggerNotificationFocusFlash(
@@ -2951,7 +2966,7 @@ final class Workspace: Identifiable, ObservableObject {
         if requiresSplit && !isSplit {
             return
         }
-        terminalPanel.triggerFlash()
+        terminalPanel.triggerFlash(color: focusFlashColor)
     }
 
     func triggerDebugFlash(panelId: UUID) {
diff --git a/cmuxTests/CmuxWebViewKeyEquivalentTests.swift b/cmuxTests/CmuxWebViewKeyEquivalentTests.swift
index 0677a847..105493f1 100644
--- a/cmuxTests/CmuxWebViewKeyEquivalentTests.swift
+++ b/cmuxTests/CmuxWebViewKeyEquivalentTests.swift
@@ -2848,6 +2848,26 @@ final class WorkspaceTabColorSettingsTests: XCTestCase {
         XCTAssertNotEqual(rendered.hexString(), originalHex)
         XCTAssertGreaterThan(rendered.luminance, base.luminance)
     }
+
+    func testWorkspaceFocusFlashColorUsesCustomHexWhenValid() {
+        let fallback = NSColor(hex: "#112233")!
+        let resolved = Workspace.resolvedFocusFlashColor(
+            customColorHex: " c0392b ",
+            fallback: fallback
+        )
+
+        XCTAssertEqual(resolved.hexString(), "#C0392B")
+    }
+
+    func testWorkspaceFocusFlashColorFallsBackWhenHexIsInvalid() {
+        let fallback = NSColor(hex: "#112233")!
+        let resolved = Workspace.resolvedFocusFlashColor(
+            customColorHex: "not-a-color",
+            fallback: fallback
+        )
+
+        XCTAssertEqual(resolved.hexString(), "#112233")
+    }
 }
 
 final class WorkspaceAutoReorderSettingsTests: XCTestCase {