//
//  ViewController.swift
//  meetings_app
//
//  Created by Dev Mac 1 on 06/04/2026.
//

import Cocoa
import WebKit

private enum SidebarPage: Int {
    case joinMeetings = 0
    case photo = 1
    case video = 2
    case tutorials = 3
    case settings = 4
    case browse = 5
}

private enum ZoomJoinMode: Int {
    case id = 0
    case url = 1
}

private enum SettingsAction: Int {
    case restore = 0
    case rateUs = 1
    case support = 2
    case moreApps = 3
    case shareApp = 4
}

private enum PremiumPlan: Int {
    case weekly = 0
    case monthly = 1
    case yearly = 2
    case lifetime = 3
}

final class ViewController: NSViewController {
    private var palette = Palette(isDarkMode: true)
    private let typography = Typography()
    private let launchContentSize = NSSize(width: 920, height: 690)
    private let launchMinContentSize = NSSize(width: 760, height: 600)

    private var mainContentHost: NSView?
    private var sidebarRowViews: [SidebarPage: NSView] = [:]
    private var selectedSidebarPage: SidebarPage = .joinMeetings
    private var selectedZoomJoinMode: ZoomJoinMode = .id
    private var pageCache: [SidebarPage: NSView] = [:]
    private var sidebarPageByView = [ObjectIdentifier: SidebarPage]()
    private var zoomJoinModeByView = [ObjectIdentifier: ZoomJoinMode]()
    private var zoomJoinModeViews: [ZoomJoinMode: NSView] = [:]
    private var settingsActionByView = [ObjectIdentifier: SettingsAction]()
    private weak var centeredTitleLabel: NSTextField?
    private weak var paywallWindow: NSWindow?
    private let paywallContentWidth: CGFloat = 520
    private var selectedPremiumPlan: PremiumPlan = .monthly
    private var paywallPlanViews: [PremiumPlan: NSView] = [:]
    private var premiumPlanByView = [ObjectIdentifier: PremiumPlan]()
    private weak var paywallOfferLabel: NSTextField?
    private weak var meetLinkField: NSTextField?
    private weak var browseAddressField: NSTextField?
    private var inAppBrowserWindowController: InAppBrowserWindowController?

    /// In-app browser navigation: `.allowAll` or `.whitelist(hostSuffixes:)` (e.g. `["google.com"]` matches `meet.google.com`).
    private let inAppBrowserDefaultPolicy: InAppBrowserURLPolicy = .allowAll

    private let darkModeDefaultsKey = "settings.darkModeEnabled"
    private var darkModeEnabled: Bool {
        get {
            let hasValue = UserDefaults.standard.object(forKey: darkModeDefaultsKey) != nil
            return hasValue ? UserDefaults.standard.bool(forKey: darkModeDefaultsKey) : true
        }
        set { UserDefaults.standard.set(newValue, forKey: darkModeDefaultsKey) }
    }

    private func makeSettingsPopover() -> NSPopover {
        let popover = NSPopover()
        popover.behavior = .transient
        popover.animates = true
        popover.contentViewController = SettingsMenuViewController(
            palette: palette,
            typography: typography,
            darkModeEnabled: darkModeEnabled,
            onToggleDarkMode: { [weak self] enabled in
                self?.setDarkMode(enabled)
            },
            onAction: { [weak self] action in
                self?.handleSettingsAction(action)
            }
        )
        return popover
    }

    private var settingsPopover: NSPopover?

    override func viewDidLoad() {
        super.viewDidLoad()
        palette = Palette(isDarkMode: darkModeEnabled)
        setupRootView()
        buildMainLayout()
    }

    override func viewDidAppear() {
        super.viewDidAppear()
        applyWindowTitle(for: selectedSidebarPage)
        guard let window = view.window else { return }

        // Ensure launch size is applied even when macOS tries to restore prior window state.
        window.isRestorable = false
        window.setFrameAutosaveName("")

        DispatchQueue.main.async { [weak self, weak window] in
            guard let self, let window else { return }

            let frameSize = window.frameRect(forContentRect: NSRect(origin: .zero, size: self.launchContentSize)).size
            var newFrame = window.frame
            newFrame.size = frameSize
            window.setFrame(newFrame, display: true)
            window.center()

            window.minSize = window.frameRect(forContentRect: NSRect(origin: .zero, size: self.launchMinContentSize)).size
            self.installCenteredTitleIfNeeded(on: window)
        }
    }

    override var representedObject: Any? {
        didSet {}
    }
}

private extension ViewController {
    func setupRootView() {
        view.appearance = NSAppearance(named: darkModeEnabled ? .darkAqua : .aqua)
        view.wantsLayer = true
        view.layer?.backgroundColor = palette.pageBackground.cgColor
    }

    func buildMainLayout() {
        let splitContainer = NSStackView()
        splitContainer.translatesAutoresizingMaskIntoConstraints = false
        splitContainer.orientation = .horizontal
        splitContainer.spacing = 0
        splitContainer.alignment = .top
        view.addSubview(splitContainer)

        NSLayoutConstraint.activate([
            splitContainer.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            splitContainer.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            splitContainer.topAnchor.constraint(equalTo: view.topAnchor),
            splitContainer.bottomAnchor.constraint(equalTo: view.bottomAnchor)
        ])

        let sidebar = makeSidebar()
        let mainPanel = makeMainPanel()
        splitContainer.addArrangedSubview(sidebar)
        splitContainer.addArrangedSubview(mainPanel)
    }

    @objc private func sidebarItemClicked(_ sender: NSClickGestureRecognizer) {
        guard let view = sender.view,
              let page = sidebarPageByView[ObjectIdentifier(view)],
              page != selectedSidebarPage || page == .settings else { return }

        if page == .settings {
            showSettingsPopover()
            return
        }

        showSidebarPage(page)
    }

    @objc private func zoomJoinModeClicked(_ sender: NSClickGestureRecognizer) {
        guard let view = sender.view,
              let mode = zoomJoinModeByView[ObjectIdentifier(view)],
              mode != selectedZoomJoinMode else { return }
        selectedZoomJoinMode = mode
        updateZoomJoinModeAppearance()
        if selectedSidebarPage == .joinMeetings {
            pageCache[.joinMeetings] = nil
            showSidebarPage(.joinMeetings)
        }
    }

    @objc private func premiumButtonClicked(_ sender: NSClickGestureRecognizer) {
        showPaywall()
    }

    @objc private func joinMeetClicked(_ sender: Any?) {
        let rawInput = meetLinkField?.stringValue.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""

        guard let url = normalizedMeetJoinURL(from: rawInput) else {
            showSimpleAlert(
                title: "Invalid Meet link",
                message: "Enter a valid Google Meet link or meeting code (for example nkd-grps-duv, meet.google.com/nkd-grps-duv, or https://meet.google.com/nkd-grps-duv)."
            )
            return
        }

        openInDefaultBrowser(url: url)
    }

    @objc private func cancelMeetJoinClicked(_ sender: Any?) {
        meetLinkField?.stringValue = ""
    }

    @objc private func browseOpenAddressClicked(_ sender: Any?) {
        let raw = browseAddressField?.stringValue.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
        guard raw.isEmpty == false else {
            showSimpleAlert(title: "Browse", message: "Enter a web address (for example meet.google.com).")
            return
        }
        let normalized = normalizedURLString(from: raw)
        guard let url = URL(string: normalized), url.scheme == "http" || url.scheme == "https" else {
            showSimpleAlert(title: "Invalid address", message: "Enter a valid http or https URL.")
            return
        }
        openInAppBrowser(with: url, policy: inAppBrowserDefaultPolicy)
    }

    @objc private func browseQuickLinkMeetClicked(_ sender: Any?) {
        guard let url = URL(string: "https://meet.google.com/") else { return }
        openInDefaultBrowser(url: url)
    }

    @objc private func browseQuickLinkMeetHelpClicked(_ sender: Any?) {
        guard let url = URL(string: "https://support.google.com/meet") else { return }
        openInAppBrowser(with: url, policy: inAppBrowserDefaultPolicy)
    }

    @objc private func browseQuickLinkZoomHelpClicked(_ sender: Any?) {
        guard let url = URL(string: "https://support.zoom.us") else { return }
        openInAppBrowser(with: url, policy: inAppBrowserDefaultPolicy)
    }

    private func normalizedURLString(from value: String) -> String {
        if value.lowercased().hasPrefix("http://") || value.lowercased().hasPrefix("https://") {
            return value
        }
        return "https://\(value)"
    }

    /// Typical Meet meeting code shape: three hyphen-separated groups (e.g. `nkd-grps-duv`).
    private func isValidMeetMeetingCode(_ code: String) -> Bool {
        let trimmed = code.trimmingCharacters(in: .whitespacesAndNewlines)
        guard trimmed.isEmpty == false else { return false }
        let pattern = "^[a-z0-9]{3}-[a-z0-9]{4}-[a-z0-9]{3}$"
        return trimmed.range(of: pattern, options: [.regularExpression, .caseInsensitive]) != nil
    }

    /// Accepts `https://meet.google.com/...`, `meet.google.com/...`, or a bare code; returns canonical Meet URL or `nil`.
    private func normalizedMeetJoinURL(from rawInput: String) -> URL? {
        let trimmed = rawInput.trimmingCharacters(in: .whitespacesAndNewlines)
        guard trimmed.isEmpty == false else { return nil }

        let lower = trimmed.lowercased()

        if lower.hasPrefix("http://") || lower.hasPrefix("https://") {
            guard let url = URL(string: trimmed),
                  let host = url.host?.lowercased(),
                  host == "meet.google.com" || host.hasSuffix(".meet.google.com") else {
                return nil
            }
            let path = url.path.trimmingCharacters(in: CharacterSet(charactersIn: "/"))
            guard path.isEmpty == false else { return nil }
            let firstSegment = path.split(separator: "/").first.map(String.init) ?? path
            guard isValidMeetMeetingCode(firstSegment) else { return nil }
            return URL(string: "https://meet.google.com/\(firstSegment.lowercased())")
        }

        if lower.hasPrefix("meet.google.com/") {
            let afterHost = trimmed.dropFirst("meet.google.com/".count)
            let beforeQuery = String(afterHost).split(separator: "?").first.map(String.init) ?? String(afterHost)
            let firstSegment = beforeQuery.split(separator: "/").first.map(String.init) ?? beforeQuery
            guard isValidMeetMeetingCode(firstSegment) else { return nil }
            return URL(string: "https://meet.google.com/\(firstSegment.lowercased())")
        }

        if isValidMeetMeetingCode(trimmed) {
            return URL(string: "https://meet.google.com/\(trimmed.lowercased())")
        }

        return nil
    }

    private func openInAppBrowser(with url: URL, policy: InAppBrowserURLPolicy = .allowAll) {
        let browserController: InAppBrowserWindowController
        if let existing = inAppBrowserWindowController {
            browserController = existing
        } else {
            browserController = InAppBrowserWindowController()
            inAppBrowserWindowController = browserController
        }

        browserController.load(url: url, policy: policy)
        browserController.applyDefaultFrameCenteredOnVisibleScreen()
        browserController.showWindow(nil)
        browserController.window?.makeKeyAndOrderFront(nil)
        browserController.window?.orderFrontRegardless()
        NSApp.activate(ignoringOtherApps: true)
    }

    private func openInDefaultBrowser(url: URL) {
        NSWorkspace.shared.open(url, configuration: NSWorkspace.OpenConfiguration()) { [weak self] _, error in
            if let error {
                DispatchQueue.main.async {
                    self?.showSimpleAlert(title: "Unable to open browser", message: error.localizedDescription)
                }
            }
        }
    }

    private func openInSafari(url: URL) {
        guard let safariAppURL = NSWorkspace.shared.urlForApplication(withBundleIdentifier: "com.apple.Safari") else {
            NSWorkspace.shared.open(url)
            return
        }

        let configuration = NSWorkspace.OpenConfiguration()
        NSWorkspace.shared.open([url], withApplicationAt: safariAppURL, configuration: configuration) { _, error in
            if let error {
                self.showSimpleAlert(title: "Unable to Open Safari", message: error.localizedDescription)
            }
        }
    }

    private func showSidebarPage(_ page: SidebarPage) {
        selectedSidebarPage = page
        updateSidebarAppearance()
        applyWindowTitle(for: page)

        guard let host = mainContentHost else { return }
        host.subviews.forEach { $0.removeFromSuperview() }
        let child = viewForPage(page)
        child.translatesAutoresizingMaskIntoConstraints = false
        host.addSubview(child)
        NSLayoutConstraint.activate([
            child.leadingAnchor.constraint(equalTo: host.leadingAnchor),
            child.trailingAnchor.constraint(equalTo: host.trailingAnchor),
            child.topAnchor.constraint(equalTo: host.topAnchor),
            child.bottomAnchor.constraint(equalTo: host.bottomAnchor)
        ])
    }

    private func showSettingsPopover() {
        guard let anchor = sidebarRowViews[.settings] else { return }
        if settingsPopover?.isShown == true {
            settingsPopover?.performClose(nil)
            return
        }

        settingsPopover = makeSettingsPopover()
        if let menu = settingsPopover?.contentViewController as? SettingsMenuViewController {
            menu.setDarkModeEnabled(darkModeEnabled)
        }

        settingsPopover?.show(relativeTo: anchor.bounds, of: anchor, preferredEdge: .maxX)
    }

    private func setDarkMode(_ enabled: Bool) {
        darkModeEnabled = enabled
        NSApp.appearance = NSAppearance(named: enabled ? .darkAqua : .aqua)
        view.appearance = NSAppearance(named: enabled ? .darkAqua : .aqua)
        palette = Palette(isDarkMode: enabled)
        settingsPopover?.performClose(nil)
        settingsPopover = nil
        reloadTheme()
    }

    private func reloadTheme() {
        pageCache.removeAll()
        sidebarRowViews.removeAll()
        sidebarPageByView.removeAll()
        zoomJoinModeByView.removeAll()
        zoomJoinModeViews.removeAll()
        settingsActionByView.removeAll()
        paywallPlanViews.removeAll()
        premiumPlanByView.removeAll()

        mainContentHost = nil
        view.subviews.forEach { $0.removeFromSuperview() }
        setupRootView()
        buildMainLayout()
        showSidebarPage(selectedSidebarPage)
    }

    private func handleSettingsAction(_ action: SettingsAction) {
        switch action {
        case .restore:
            showSimpleAlert(title: "Restore", message: "Restore action tapped.")
        case .rateUs:
            settingsPopover?.performClose(nil)
            settingsPopover = nil
            // Replace with your App Store product URL when the app is listed.
            if let url = URL(string: "https://apps.apple.com/app/id0000000000") {
                openInAppBrowser(with: url, policy: inAppBrowserDefaultPolicy)
            }
        case .support:
            settingsPopover?.performClose(nil)
            settingsPopover = nil
            if let url = URL(string: "https://support.google.com/meet") {
                openInAppBrowser(with: url, policy: inAppBrowserDefaultPolicy)
            }
        case .moreApps:
            settingsPopover?.performClose(nil)
            settingsPopover = nil
            // Replace with your App Store developer page URL.
            if let url = URL(string: "https://apps.apple.com/developer/id0000000000") {
                openInAppBrowser(with: url, policy: inAppBrowserDefaultPolicy)
            }
        case .shareApp:
            let urlString = "https://example.com"
            NSPasteboard.general.clearContents()
            NSPasteboard.general.setString(urlString, forType: .string)
            showSimpleAlert(title: "Share App", message: "Link copied to clipboard:\n\(urlString)")
        }
    }

    private func showSimpleAlert(title: String, message: String) {
        let alert = NSAlert()
        alert.messageText = title
        alert.informativeText = message
        alert.addButton(withTitle: "OK")
        alert.runModal()
    }

    private func showPaywall() {
        if let existing = paywallWindow {
            existing.makeKeyAndOrderFront(nil)
            NSApp.activate(ignoringOtherApps: true)
            return
        }

        let content = makePaywallContent()
        let controller = NSViewController()
        controller.view = content

        let panel = NSPanel(
            contentRect: NSRect(x: 0, y: 0, width: 640, height: 820),
            styleMask: [.titled, .closable, .fullSizeContentView],
            backing: .buffered,
            defer: false
        )
        panel.title = "Get Premium"
        panel.titleVisibility = .hidden
        panel.titlebarAppearsTransparent = true
        panel.isFloatingPanel = true
        panel.hidesOnDeactivate = false
        panel.standardWindowButton(.closeButton)?.isHidden = true
        panel.standardWindowButton(.miniaturizeButton)?.isHidden = true
        panel.standardWindowButton(.zoomButton)?.isHidden = true
        panel.center()
        panel.contentViewController = controller
        panel.makeKeyAndOrderFront(nil)
        NSApp.activate(ignoringOtherApps: true)
        paywallWindow = panel
    }

    @objc private func closePaywallClicked(_ sender: NSClickGestureRecognizer) {
        paywallWindow?.close()
        paywallWindow = nil
    }

    @objc private func paywallFooterLinkClicked(_ sender: NSClickGestureRecognizer) {
        guard let view = sender.view else { return }
        let text = (view.subviews.first { $0 is NSTextField } as? NSTextField)?.stringValue ?? "Link"
        let map: [String: String] = [
            "Privacy Policy": "https://policies.google.com/privacy",
            "Support": "https://support.google.com/meet",
            "Terms of Services": "https://policies.google.com/terms"
        ]
        if let urlString = map[text], let url = URL(string: urlString) {
            openInAppBrowser(with: url, policy: inAppBrowserDefaultPolicy)
            return
        }
        showSimpleAlert(title: text, message: "\(text) tapped.")
    }

    @objc private func paywallPlanClicked(_ sender: NSClickGestureRecognizer) {
        guard let view = sender.view,
              let plan = premiumPlanByView[ObjectIdentifier(view)] else { return }
        selectedPremiumPlan = plan
        updatePaywallPlanSelection()
    }

    private func updatePaywallPlanSelection() {
        for (plan, view) in paywallPlanViews {
            applyPaywallPlanStyle(view, isSelected: plan == selectedPremiumPlan)
        }
        paywallOfferLabel?.stringValue = paywallOfferText(for: selectedPremiumPlan)
    }

    private func paywallOfferText(for plan: PremiumPlan) -> String {
        switch plan {
        case .weekly:
            return "Rs 1,100.00/week"
        case .monthly:
            return "Free for 3 Days then Rs 2,500.00/month"
        case .yearly:
            return "Rs 9,900.00/year (about 190.38/week)"
        case .lifetime:
            return "Rs 14,900.00 one-time purchase"
        }
    }

    private func applyPaywallPlanStyle(_ card: NSView, isSelected: Bool) {
        let selectedBorder = NSColor(calibratedRed: 1.0, green: 0.60, blue: 0.20, alpha: 1)
        let idleBorder = palette.inputBorder
        let selectedBackground = darkModeEnabled
            ? NSColor(calibratedRed: 30.0 / 255.0, green: 34.0 / 255.0, blue: 42.0 / 255.0, alpha: 1)
            : NSColor(calibratedRed: 255.0 / 255.0, green: 246.0 / 255.0, blue: 236.0 / 255.0, alpha: 1)
        card.layer?.backgroundColor = (isSelected ? selectedBackground : palette.sectionCard).cgColor
        card.layer?.borderColor = (isSelected ? selectedBorder : idleBorder).cgColor
        card.layer?.borderWidth = isSelected ? 2 : 1
        card.layer?.shadowColor = NSColor.black.cgColor
        card.layer?.shadowOpacity = isSelected ? (darkModeEnabled ? 0.26 : 0.10) : 0.12
        card.layer?.shadowOffset = CGSize(width: 0, height: -1)
        card.layer?.shadowRadius = isSelected ? (darkModeEnabled ? 10 : 6) : 5
    }

    private func viewForPage(_ page: SidebarPage) -> NSView {
        if let cached = pageCache[page] { return cached }
        let built: NSView
        switch page {
        case .joinMeetings:
            built = makeJoinMeetingsContent()
        case .photo:
            built = makePlaceholderPage(title: "Photo", subtitle: "Backgrounds — choose a photo background for your meetings.")
        case .video:
            built = makePlaceholderPage(title: "Video", subtitle: "Backgrounds — video background options.")
        case .tutorials:
            built = makePlaceholderPage(title: "Tutorials", subtitle: "Learn how to use the app.")
        case .settings:
            built = makePlaceholderPage(title: "Settings", subtitle: "Preferences and account options.")
        case .browse:
            built = makeBrowseWebContent()
        }
        pageCache[page] = built
        return built
    }

    private func makePlaceholderPage(title: String, subtitle: String) -> NSView {
        let panel = NSView()
        panel.translatesAutoresizingMaskIntoConstraints = false
        let titleLabel = textLabel(title, font: typography.pageTitle, color: palette.textPrimary)
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
        let sub = textLabel(subtitle, font: typography.fieldLabel, color: palette.textSecondary)
        sub.translatesAutoresizingMaskIntoConstraints = false
        panel.addSubview(titleLabel)
        panel.addSubview(sub)
        NSLayoutConstraint.activate([
            titleLabel.leadingAnchor.constraint(equalTo: panel.leadingAnchor, constant: 28),
            titleLabel.topAnchor.constraint(equalTo: panel.topAnchor, constant: 26),
            sub.leadingAnchor.constraint(equalTo: titleLabel.leadingAnchor),
            sub.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 8)
        ])
        return panel
    }

    func makeBrowseWebContent() -> NSView {
        let panel = NSView()
        panel.translatesAutoresizingMaskIntoConstraints = false

        let titleLabel = textLabel("Browse the web", font: typography.pageTitle, color: palette.textPrimary)
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
        let sub = textLabel(
            "Open sites in the in-app browser (back, forward, reload, address bar). OAuth and “Continue in browser” flows stay inside the app.",
            font: typography.fieldLabel,
            color: palette.textSecondary
        )
        sub.translatesAutoresizingMaskIntoConstraints = false
        sub.maximumNumberOfLines = 0
        sub.lineBreakMode = .byWordWrapping

        let fieldShell = roundedContainer(cornerRadius: 8, color: palette.inputBackground)
        fieldShell.translatesAutoresizingMaskIntoConstraints = false
        fieldShell.heightAnchor.constraint(equalToConstant: 44).isActive = true
        styleSurface(fieldShell, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)

        let field = NSTextField(string: "")
        field.translatesAutoresizingMaskIntoConstraints = false
        field.isEditable = true
        field.isBordered = false
        field.drawsBackground = false
        field.focusRingType = .none
        field.font = NSFont.systemFont(ofSize: 14, weight: .regular)
        field.textColor = palette.textPrimary
        field.placeholderString = "https://example.com or example.com"
        field.delegate = self
        browseAddressField = field
        fieldShell.addSubview(field)

        let openBtn = meetActionButton(
            title: "Open in app browser",
            color: palette.primaryBlue,
            textColor: .white,
            width: 220,
            action: #selector(browseOpenAddressClicked(_:))
        )

        let quickTitle = textLabel("Quick links", font: typography.joinWithURLTitle, color: palette.textPrimary)
        quickTitle.translatesAutoresizingMaskIntoConstraints = false

        let quickRow = NSStackView()
        quickRow.translatesAutoresizingMaskIntoConstraints = false
        quickRow.orientation = .horizontal
        quickRow.spacing = 10
        quickRow.addArrangedSubview(browseQuickLinkButton(title: "Google Meet", action: #selector(browseQuickLinkMeetClicked(_:))))
        quickRow.addArrangedSubview(browseQuickLinkButton(title: "Meet help", action: #selector(browseQuickLinkMeetHelpClicked(_:))))
        quickRow.addArrangedSubview(browseQuickLinkButton(title: "Zoom help", action: #selector(browseQuickLinkZoomHelpClicked(_:))))

        panel.addSubview(titleLabel)
        panel.addSubview(sub)
        panel.addSubview(fieldShell)
        panel.addSubview(openBtn)
        panel.addSubview(quickTitle)
        panel.addSubview(quickRow)

        NSLayoutConstraint.activate([
            titleLabel.leadingAnchor.constraint(equalTo: panel.leadingAnchor, constant: 28),
            titleLabel.topAnchor.constraint(equalTo: panel.topAnchor, constant: 26),
            titleLabel.trailingAnchor.constraint(lessThanOrEqualTo: panel.trailingAnchor, constant: -28),

            sub.leadingAnchor.constraint(equalTo: titleLabel.leadingAnchor),
            sub.trailingAnchor.constraint(lessThanOrEqualTo: panel.trailingAnchor, constant: -28),
            sub.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 10),

            fieldShell.leadingAnchor.constraint(equalTo: titleLabel.leadingAnchor),
            fieldShell.trailingAnchor.constraint(equalTo: panel.trailingAnchor, constant: -28),
            fieldShell.topAnchor.constraint(equalTo: sub.bottomAnchor, constant: 18),

            field.leadingAnchor.constraint(equalTo: fieldShell.leadingAnchor, constant: 12),
            field.trailingAnchor.constraint(equalTo: fieldShell.trailingAnchor, constant: -12),
            field.centerYAnchor.constraint(equalTo: fieldShell.centerYAnchor),

            openBtn.leadingAnchor.constraint(equalTo: titleLabel.leadingAnchor),
            openBtn.topAnchor.constraint(equalTo: fieldShell.bottomAnchor, constant: 12),
            openBtn.heightAnchor.constraint(equalToConstant: 36),

            quickTitle.leadingAnchor.constraint(equalTo: titleLabel.leadingAnchor),
            quickTitle.topAnchor.constraint(equalTo: openBtn.bottomAnchor, constant: 28),

            quickRow.leadingAnchor.constraint(equalTo: titleLabel.leadingAnchor),
            quickRow.topAnchor.constraint(equalTo: quickTitle.bottomAnchor, constant: 10)
        ])

        return panel
    }

    private func browseQuickLinkButton(title: String, action: Selector) -> NSButton {
        let b = NSButton(title: title, target: self, action: action)
        b.translatesAutoresizingMaskIntoConstraints = false
        b.bezelStyle = .rounded
        b.font = NSFont.systemFont(ofSize: 13, weight: .medium)
        return b
    }

    private func applyWindowTitle(for page: SidebarPage) {
        let title: String
        switch page {
        case .joinMeetings:
            title = "App for Google Meet"
        case .photo:
            title = "Backgrounds — Photo"
        case .video:
            title = "Backgrounds — Video"
        case .tutorials:
            title = "Tutorials"
        case .settings:
            title = "Settings"
        case .browse:
            title = "Browse"
        }
        view.window?.title = title
        centeredTitleLabel?.stringValue = title
    }

    private func installCenteredTitleIfNeeded(on window: NSWindow) {
        guard centeredTitleLabel == nil else { return }
        guard let titlebarView = window.standardWindowButton(.closeButton)?.superview else { return }

        let label = NSTextField(labelWithString: window.title)
        label.translatesAutoresizingMaskIntoConstraints = false
        label.alignment = .center
        label.font = NSFont.titleBarFont(ofSize: 0)
        label.textColor = .labelColor
        label.lineBreakMode = .byTruncatingTail
        label.maximumNumberOfLines = 1

        titlebarView.addSubview(label)

        NSLayoutConstraint.activate([
            label.centerXAnchor.constraint(equalTo: titlebarView.centerXAnchor),
            label.centerYAnchor.constraint(equalTo: titlebarView.centerYAnchor),
            label.leadingAnchor.constraint(greaterThanOrEqualTo: titlebarView.leadingAnchor, constant: 90),
            label.trailingAnchor.constraint(lessThanOrEqualTo: titlebarView.trailingAnchor, constant: -90)
        ])

        window.titleVisibility = .hidden
        centeredTitleLabel = label
    }

    private func updateSidebarAppearance() {
        for (page, row) in sidebarRowViews {
            applySidebarRowStyle(row, page: page, logoTemplate: logoTemplateForSidebarPage(page))
        }
    }

    private func logoTemplateForSidebarPage(_ page: SidebarPage) -> Bool {
        switch page {
        case .photo, .tutorials: return false
        case .joinMeetings, .video, .settings, .browse: return true
        }
    }

    func makeSidebar() -> NSView {
        let sidebar = NSView()
        sidebar.translatesAutoresizingMaskIntoConstraints = false
        sidebar.wantsLayer = true
        sidebar.layer?.backgroundColor = palette.sidebarBackground.cgColor
        sidebar.layer?.borderColor = palette.separator.cgColor
        sidebar.layer?.borderWidth = 1
        sidebar.layer?.shadowColor = NSColor.black.cgColor
        sidebar.layer?.shadowOpacity = 0.18
        sidebar.layer?.shadowOffset = CGSize(width: 2, height: 0)
        sidebar.layer?.shadowRadius = 10
        sidebar.widthAnchor.constraint(equalToConstant: 210).isActive = true

        let titleRow = NSStackView(views: [
            iconLabel("📅", size: 24),
            textLabel("Meetings", font: typography.sidebarBrand, color: palette.textPrimary)
        ])
        titleRow.translatesAutoresizingMaskIntoConstraints = false
        titleRow.orientation = .horizontal
        titleRow.alignment = .centerY
        titleRow.spacing = 8

        let menuStack = NSStackView()
        menuStack.translatesAutoresizingMaskIntoConstraints = false
        menuStack.orientation = .vertical
        menuStack.alignment = .leading
        menuStack.spacing = 10

        menuStack.addArrangedSubview(sidebarSectionTitle("Meetings"))
        let joinRow = sidebarItem("Join Meetings", icon: "􀉣", page: .joinMeetings, logoImageName: "JoinMeetingsLogo", logoIconWidth: 24, logoHeightMultiplier: 56.0 / 52.0)
        menuStack.addArrangedSubview(joinRow)
        sidebarRowViews[.joinMeetings] = joinRow
        menuStack.addArrangedSubview(sidebarSectionTitle("Backgrounds"))
        let photoRow = sidebarItem("Photo", icon: "􀏂", page: .photo, logoImageName: "SidebarPhotoLogo", logoIconWidth: 24, logoHeightMultiplier: 82.0 / 62.0)
        menuStack.addArrangedSubview(photoRow)
        sidebarRowViews[.photo] = photoRow
        let videoRow = sidebarItem("Video", icon: "􀎚", page: .video, logoImageName: "SidebarVideoLogo", logoIconWidth: 28, logoHeightMultiplier: 52.0 / 60.0)
        menuStack.addArrangedSubview(videoRow)
        sidebarRowViews[.video] = videoRow
        menuStack.addArrangedSubview(sidebarSectionTitle("Additional"))
        let tutorialsRow = sidebarItem("Tutorials", icon: "􀛩", page: .tutorials, logoImageName: "SidebarTutorialsLogo", logoIconWidth: 24, logoHeightMultiplier: 50.0 / 60.0)
        menuStack.addArrangedSubview(tutorialsRow)
        sidebarRowViews[.tutorials] = tutorialsRow
        let browseRow = sidebarItem("Browse", icon: "􀎆", page: .browse)
        menuStack.addArrangedSubview(browseRow)
        sidebarRowViews[.browse] = browseRow
        let settingsRow = sidebarItem("Settings", icon: "􀍟", page: .settings, logoImageName: "SidebarSettingsLogo", logoIconWidth: 28, logoHeightMultiplier: 68.0 / 62.0, showsDisclosure: true)
        menuStack.addArrangedSubview(settingsRow)
        sidebarRowViews[.settings] = settingsRow

        let premiumButton = sidebarPremiumButton()

        sidebar.addSubview(titleRow)
        sidebar.addSubview(menuStack)
        sidebar.addSubview(premiumButton)

        NSLayoutConstraint.activate([
            titleRow.leadingAnchor.constraint(equalTo: sidebar.leadingAnchor, constant: 16),
            titleRow.topAnchor.constraint(equalTo: sidebar.topAnchor, constant: 24),
            titleRow.trailingAnchor.constraint(lessThanOrEqualTo: sidebar.trailingAnchor, constant: -16),

            menuStack.leadingAnchor.constraint(equalTo: sidebar.leadingAnchor, constant: 12),
            menuStack.trailingAnchor.constraint(equalTo: sidebar.trailingAnchor, constant: -12),
            menuStack.topAnchor.constraint(equalTo: titleRow.bottomAnchor, constant: 20),
            menuStack.bottomAnchor.constraint(lessThanOrEqualTo: premiumButton.topAnchor, constant: -16),

            premiumButton.leadingAnchor.constraint(equalTo: sidebar.leadingAnchor, constant: 12),
            premiumButton.trailingAnchor.constraint(equalTo: sidebar.trailingAnchor, constant: -12),
            premiumButton.bottomAnchor.constraint(equalTo: sidebar.bottomAnchor, constant: -14)
        ])

        for subview in menuStack.arrangedSubviews {
            subview.widthAnchor.constraint(equalTo: menuStack.widthAnchor).isActive = true
        }

        return sidebar
    }

    func sidebarPremiumButton() -> NSView {
        let button = HoverTrackingView()
        button.translatesAutoresizingMaskIntoConstraints = false
        button.wantsLayer = true
        button.layer?.cornerRadius = 17
        button.layer?.backgroundColor = palette.primaryBlue.cgColor
        button.heightAnchor.constraint(equalToConstant: 34).isActive = true
        styleSurface(button, borderColor: palette.primaryBlueBorder, borderWidth: 1, shadow: false)

        let icon = textLabel("★", font: NSFont.systemFont(ofSize: 12, weight: .semibold), color: .white)
        let title = textLabel("Get Premium", font: NSFont.systemFont(ofSize: 14, weight: .semibold), color: .white)
        button.addSubview(icon)
        button.addSubview(title)

        NSLayoutConstraint.activate([
            icon.leadingAnchor.constraint(equalTo: button.leadingAnchor, constant: 12),
            icon.centerYAnchor.constraint(equalTo: button.centerYAnchor),
            title.leadingAnchor.constraint(equalTo: icon.trailingAnchor, constant: 8),
            title.centerYAnchor.constraint(equalTo: button.centerYAnchor),
            title.trailingAnchor.constraint(lessThanOrEqualTo: button.trailingAnchor, constant: -12)
        ])

        let baseColor = palette.primaryBlue
        let hoverBlend = darkModeEnabled ? NSColor.white : NSColor.black
        let hoverColor = baseColor.blended(withFraction: 0.10, of: hoverBlend) ?? baseColor
        button.onHoverChanged = { hovering in
            button.layer?.backgroundColor = (hovering ? hoverColor : baseColor).cgColor
        }
        button.onHoverChanged?(false)

        let click = NSClickGestureRecognizer(target: self, action: #selector(premiumButtonClicked(_:)))
        button.addGestureRecognizer(click)
        return button
    }

    func makeMainPanel() -> NSView {
        let panel = NSView()
        panel.translatesAutoresizingMaskIntoConstraints = false
        panel.wantsLayer = true
        panel.layer?.backgroundColor = palette.pageBackground.cgColor

        let host = NSView()
        host.translatesAutoresizingMaskIntoConstraints = false
        panel.addSubview(host)
        NSLayoutConstraint.activate([
            host.leadingAnchor.constraint(equalTo: panel.leadingAnchor),
            host.trailingAnchor.constraint(equalTo: panel.trailingAnchor),
            host.topAnchor.constraint(equalTo: panel.topAnchor),
            host.bottomAnchor.constraint(equalTo: panel.bottomAnchor)
        ])
        mainContentHost = host
        showSidebarPage(.joinMeetings)

        return panel
    }

    func makeJoinMeetingsContent() -> NSView {
        let panel = NSView()
        panel.translatesAutoresizingMaskIntoConstraints = false

        let contentStack = NSStackView()
        contentStack.translatesAutoresizingMaskIntoConstraints = false
        contentStack.orientation = .vertical
        contentStack.spacing = 14
        contentStack.alignment = .leading

        let joinActions = meetJoinActionsRow()
        contentStack.addArrangedSubview(textLabel("Join Meetings", font: typography.pageTitle, color: palette.textPrimary))
        contentStack.addArrangedSubview(meetJoinSectionRow())
        contentStack.addArrangedSubview(joinActions)
        contentStack.setCustomSpacing(26, after: joinActions)
        contentStack.addArrangedSubview(scheduleHeader())
        contentStack.addArrangedSubview(textLabel("Tuesday, 14 Apr", font: typography.dateHeading, color: palette.textSecondary))
        contentStack.addArrangedSubview(scheduleCardsRow())

        panel.addSubview(contentStack)

        NSLayoutConstraint.activate([
            contentStack.leadingAnchor.constraint(equalTo: panel.leadingAnchor, constant: 28),
            contentStack.trailingAnchor.constraint(equalTo: panel.trailingAnchor, constant: -28),
            contentStack.topAnchor.constraint(equalTo: panel.topAnchor, constant: 26)
        ])

        return panel
    }

    func meetJoinSectionRow() -> NSView {
        let row = NSStackView()
        row.translatesAutoresizingMaskIntoConstraints = false
        row.orientation = .horizontal
        row.spacing = 12
        row.alignment = .top
        row.distribution = .fillEqually
        row.widthAnchor.constraint(greaterThanOrEqualToConstant: 880).isActive = true
        row.heightAnchor.constraint(equalToConstant: 140).isActive = true

        let instant = HoverSurfaceView()
        instant.translatesAutoresizingMaskIntoConstraints = false
        instant.wantsLayer = true
        instant.layer?.cornerRadius = 14
        instant.layer?.backgroundColor = palette.sectionCard.cgColor
        styleSurface(instant, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)

        let iconWrap = roundedContainer(cornerRadius: 12, color: NSColor.clear)
        iconWrap.translatesAutoresizingMaskIntoConstraints = false
        iconWrap.widthAnchor.constraint(equalToConstant: 58).isActive = true
        iconWrap.heightAnchor.constraint(equalToConstant: 58).isActive = true
        iconWrap.layer?.borderWidth = 0
        let meetLogoImage = NSImage(named: "MeetLogo") ?? NSImage()
        meetLogoImage.isTemplate = false
        let meetLogo = NSImageView(image: meetLogoImage)
        meetLogo.translatesAutoresizingMaskIntoConstraints = false
        meetLogo.imageScaling = .scaleProportionallyDown
        meetLogo.contentTintColor = nil
        iconWrap.addSubview(meetLogo)

        let instantTitle = textLabel("New Instant Meet", font: NSFont.systemFont(ofSize: 40 / 2, weight: .semibold), color: palette.textPrimary)
        let instantSub = textLabel("Start instant Meet in more section with\nGoogle Meet meet.", font: NSFont.systemFont(ofSize: 16 / 2, weight: .medium), color: palette.textSecondary)
        instantSub.maximumNumberOfLines = 2
        instant.addSubview(iconWrap)
        instant.addSubview(instantTitle)
        instant.addSubview(instantSub)

        let codeCard = HoverSurfaceView()
        codeCard.translatesAutoresizingMaskIntoConstraints = false
        codeCard.wantsLayer = true
        codeCard.layer?.cornerRadius = 14
        codeCard.layer?.backgroundColor = palette.sectionCard.cgColor
        styleSurface(codeCard, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)
        let codeTitle = textLabel("Join with Link", font: NSFont.systemFont(ofSize: 40 / 2, weight: .semibold), color: palette.textPrimary)
        let codeInputShell = roundedContainer(cornerRadius: 8, color: palette.inputBackground)
        codeInputShell.translatesAutoresizingMaskIntoConstraints = false
        codeInputShell.heightAnchor.constraint(equalToConstant: 52).isActive = true
        styleSurface(codeInputShell, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)
        let codeField = NSTextField(string: "")
        codeField.translatesAutoresizingMaskIntoConstraints = false
        codeField.isEditable = true
        codeField.isBordered = false
        codeField.drawsBackground = false
        codeField.focusRingType = .none
        codeField.font = NSFont.systemFont(ofSize: 36 / 2, weight: .regular)
        codeField.textColor = palette.textPrimary
        codeField.placeholderString = "Code or meet.google.com/…"
        codeInputShell.addSubview(codeField)
        meetLinkField = codeField
        codeCard.addSubview(codeTitle)
        codeCard.addSubview(codeInputShell)

        NSLayoutConstraint.activate([
            meetLogo.centerXAnchor.constraint(equalTo: iconWrap.centerXAnchor),
            meetLogo.centerYAnchor.constraint(equalTo: iconWrap.centerYAnchor),
            meetLogo.widthAnchor.constraint(equalToConstant: 46),
            meetLogo.heightAnchor.constraint(equalToConstant: 46),

            iconWrap.leadingAnchor.constraint(equalTo: instant.leadingAnchor, constant: 18),
            iconWrap.topAnchor.constraint(equalTo: instant.topAnchor, constant: 22),
            instantTitle.leadingAnchor.constraint(equalTo: iconWrap.trailingAnchor, constant: 14),
            instantTitle.topAnchor.constraint(equalTo: instant.topAnchor, constant: 24),
            instantSub.leadingAnchor.constraint(equalTo: instantTitle.leadingAnchor),
            instantSub.topAnchor.constraint(equalTo: instantTitle.bottomAnchor, constant: 6),
            instantSub.trailingAnchor.constraint(lessThanOrEqualTo: instant.trailingAnchor, constant: -16),

            codeTitle.leadingAnchor.constraint(equalTo: codeCard.leadingAnchor, constant: 18),
            codeTitle.topAnchor.constraint(equalTo: codeCard.topAnchor, constant: 22),
            codeInputShell.leadingAnchor.constraint(equalTo: codeCard.leadingAnchor, constant: 18),
            codeInputShell.trailingAnchor.constraint(equalTo: codeCard.trailingAnchor, constant: -18),
            codeInputShell.topAnchor.constraint(equalTo: codeTitle.bottomAnchor, constant: 12),
            codeField.leadingAnchor.constraint(equalTo: codeInputShell.leadingAnchor, constant: 14),
            codeField.trailingAnchor.constraint(equalTo: codeInputShell.trailingAnchor, constant: -14),
            codeField.centerYAnchor.constraint(equalTo: codeInputShell.centerYAnchor)
        ])

        let baseColor = palette.sectionCard
        let hoverBlend = darkModeEnabled ? NSColor.white : NSColor.black
        let hoverColor = baseColor.blended(withFraction: 0.10, of: hoverBlend) ?? baseColor
        instant.onHoverChanged = { hovering in
            instant.layer?.backgroundColor = (hovering ? hoverColor : baseColor).cgColor
        }
        codeCard.onHoverChanged = { hovering in
            codeCard.layer?.backgroundColor = (hovering ? hoverColor : baseColor).cgColor
        }
        instant.onHoverChanged?(false)
        codeCard.onHoverChanged?(false)

        row.addArrangedSubview(instant)
        row.addArrangedSubview(codeCard)
        return row
    }

    func meetJoinActionsRow() -> NSView {
        let row = NSStackView()
        row.translatesAutoresizingMaskIntoConstraints = false
        row.orientation = .horizontal
        row.spacing = 12
        row.alignment = .centerY
        row.widthAnchor.constraint(greaterThanOrEqualToConstant: 880).isActive = true

        let spacer = NSView()
        spacer.translatesAutoresizingMaskIntoConstraints = false
        row.addArrangedSubview(spacer)
        row.addArrangedSubview(meetActionButton(
            title: "Cancel",
            color: palette.cancelButton,
            textColor: palette.textSecondary,
            width: 110,
            action: #selector(cancelMeetJoinClicked(_:))
        ))
        row.addArrangedSubview(meetActionButton(
            title: "Join",
            color: palette.primaryBlue,
            textColor: .white,
            width: 116,
            action: #selector(joinMeetClicked(_:))
        ))
        return row
    }

    func meetActionButton(title: String, color: NSColor, textColor: NSColor, width: CGFloat, action: Selector) -> NSButton {
        let button = NSButton(title: title, target: self, action: action)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.isBordered = false
        button.bezelStyle = .regularSquare
        button.wantsLayer = true
        button.layer?.cornerRadius = 9
        button.layer?.backgroundColor = color.cgColor
        button.layer?.borderColor = (title == "Cancel" ? palette.inputBorder : palette.primaryBlueBorder).cgColor
        button.layer?.borderWidth = 1
        button.font = typography.buttonText
        button.contentTintColor = textColor
        button.widthAnchor.constraint(equalToConstant: width).isActive = true
        button.heightAnchor.constraint(equalToConstant: 36).isActive = true
        return button
    }

    func makePaywallContent() -> NSView {
        paywallPlanViews.removeAll()
        premiumPlanByView.removeAll()

        let panel = NSView()
        panel.translatesAutoresizingMaskIntoConstraints = false
        panel.wantsLayer = true
        panel.layer?.backgroundColor = palette.pageBackground.cgColor

        let contentStack = NSStackView()
        contentStack.translatesAutoresizingMaskIntoConstraints = false
        contentStack.orientation = .vertical
        contentStack.spacing = 12
        contentStack.alignment = .leading
        panel.addSubview(contentStack)

        let topRow = NSStackView()
        topRow.translatesAutoresizingMaskIntoConstraints = false
        topRow.orientation = .horizontal
        topRow.alignment = .centerY
        topRow.distribution = .fill
        topRow.spacing = 10
        topRow.addArrangedSubview(textLabel("Get Premium", font: NSFont.systemFont(ofSize: 24, weight: .bold), color: palette.textPrimary))
        let topSpacer = NSView()
        topSpacer.translatesAutoresizingMaskIntoConstraints = false
        topRow.addArrangedSubview(topSpacer)
        let closeButton = iconRoundButton("✕", size: 28)
        topRow.addArrangedSubview(closeButton)
        let closeClick = NSClickGestureRecognizer(target: self, action: #selector(closePaywallClicked(_:)))
        closeButton.addGestureRecognizer(closeClick)
        topRow.widthAnchor.constraint(greaterThanOrEqualToConstant: paywallContentWidth).isActive = true
        contentStack.addArrangedSubview(topRow)

        contentStack.addArrangedSubview(textLabel("Upgrade to unlock premium features.", font: NSFont.systemFont(ofSize: 12, weight: .medium), color: palette.textSecondary))
        let benefits = paywallBenefitsSection()
        contentStack.addArrangedSubview(benefits)
        contentStack.setCustomSpacing(18, after: benefits)

        let weeklyCard = paywallPlanCard(
            title: "Weekly",
            price: "Rs 1,100.00",
            badge: "Basic Deal",
            badgeColor: NSColor(calibratedRed: 1.0, green: 0.60, blue: 0.20, alpha: 1),
            subtitle: nil,
            plan: .weekly,
            strikePrice: nil
        )
        contentStack.addArrangedSubview(weeklyCard)

        let monthlyCard = paywallPlanCard(
            title: "Monthly",
            price: "Rs 2,500.00",
            badge: "Free Trial",
            badgeColor: NSColor(calibratedRed: 0.19, green: 0.82, blue: 0.39, alpha: 1),
            subtitle: "625.00/week",
            plan: .monthly,
            strikePrice: nil
        )
        contentStack.addArrangedSubview(monthlyCard)

        let yearlyCard = paywallPlanCard(
            title: "Yearly",
            price: "Rs 9,900.00",
            badge: "Best Deal",
            badgeColor: NSColor(calibratedRed: 1.0, green: 0.60, blue: 0.20, alpha: 1),
            subtitle: "190.38/week",
            plan: .yearly,
            strikePrice: nil
        )
        contentStack.addArrangedSubview(yearlyCard)

        let lifetimeCard = paywallPlanCard(
            title: "Lifetime",
            price: "Rs 14,900.00",
            badge: "Save 50%",
            badgeColor: NSColor(calibratedRed: 1.0, green: 0.60, blue: 0.20, alpha: 1),
            subtitle: nil,
            plan: .lifetime,
            strikePrice: "Rs 29,800.00"
        )
        contentStack.addArrangedSubview(lifetimeCard)
        updatePaywallPlanSelection()
        contentStack.setCustomSpacing(20, after: lifetimeCard)

        let offer = textLabel(paywallOfferText(for: selectedPremiumPlan), font: NSFont.systemFont(ofSize: 13, weight: .semibold), color: palette.textPrimary)
        offer.alignment = .center
        paywallOfferLabel = offer
        let offerWrap = NSView()
        offerWrap.translatesAutoresizingMaskIntoConstraints = false
        offerWrap.addSubview(offer)
        NSLayoutConstraint.activate([
            offerWrap.widthAnchor.constraint(greaterThanOrEqualToConstant: paywallContentWidth),
            offer.centerXAnchor.constraint(equalTo: offerWrap.centerXAnchor),
            offer.topAnchor.constraint(equalTo: offerWrap.topAnchor, constant: 6),
            offer.bottomAnchor.constraint(equalTo: offerWrap.bottomAnchor, constant: -2)
        ])
        contentStack.addArrangedSubview(offerWrap)
        contentStack.setCustomSpacing(18, after: offerWrap)

        let continueButton = roundedContainer(cornerRadius: 14, color: palette.primaryBlue)
        continueButton.translatesAutoresizingMaskIntoConstraints = false
        continueButton.heightAnchor.constraint(equalToConstant: 44).isActive = true
        continueButton.widthAnchor.constraint(greaterThanOrEqualToConstant: paywallContentWidth).isActive = true
        styleSurface(continueButton, borderColor: palette.primaryBlueBorder, borderWidth: 1, shadow: true)
        let continueLabel = textLabel("Continue", font: NSFont.systemFont(ofSize: 16, weight: .bold), color: .white)
        continueButton.addSubview(continueLabel)
        NSLayoutConstraint.activate([
            continueLabel.centerXAnchor.constraint(equalTo: continueButton.centerXAnchor),
            continueLabel.centerYAnchor.constraint(equalTo: continueButton.centerYAnchor)
        ])
        contentStack.addArrangedSubview(continueButton)
        contentStack.setCustomSpacing(16, after: continueButton)

        let secure = textLabel("Secured by Apple. Cancel anytime.", font: NSFont.systemFont(ofSize: 12, weight: .semibold), color: palette.textSecondary)
        secure.alignment = .center
        let secureWrap = NSView()
        secureWrap.translatesAutoresizingMaskIntoConstraints = false
        secureWrap.addSubview(secure)
        NSLayoutConstraint.activate([
            secureWrap.widthAnchor.constraint(greaterThanOrEqualToConstant: paywallContentWidth),
            secure.centerXAnchor.constraint(equalTo: secureWrap.centerXAnchor),
            secure.topAnchor.constraint(equalTo: secureWrap.topAnchor, constant: 4),
            secure.bottomAnchor.constraint(equalTo: secureWrap.bottomAnchor, constant: -8)
        ])
        contentStack.addArrangedSubview(secureWrap)
        contentStack.setCustomSpacing(16, after: secureWrap)

        let footer = paywallFooterLinks()
        contentStack.addArrangedSubview(footer)

        NSLayoutConstraint.activate([
            contentStack.leadingAnchor.constraint(equalTo: panel.leadingAnchor, constant: 18),
            contentStack.trailingAnchor.constraint(equalTo: panel.trailingAnchor, constant: -18),
            contentStack.topAnchor.constraint(equalTo: panel.topAnchor, constant: 16),
            contentStack.bottomAnchor.constraint(lessThanOrEqualTo: panel.bottomAnchor, constant: -12)
        ])

        return panel
    }

    func paywallPlanCard(
        title: String,
        price: String,
        badge: String,
        badgeColor: NSColor,
        subtitle: String?,
        plan: PremiumPlan,
        strikePrice: String?
    ) -> NSView {
        let wrapper = NSView()
        wrapper.translatesAutoresizingMaskIntoConstraints = false
        wrapper.widthAnchor.constraint(greaterThanOrEqualToConstant: paywallContentWidth).isActive = true
        wrapper.heightAnchor.constraint(equalToConstant: 94).isActive = true

        let card = roundedContainer(cornerRadius: 16, color: palette.sectionCard)
        card.translatesAutoresizingMaskIntoConstraints = false
        card.heightAnchor.constraint(equalToConstant: 82).isActive = true
        wrapper.addSubview(card)
        NSLayoutConstraint.activate([
            card.leadingAnchor.constraint(equalTo: wrapper.leadingAnchor),
            card.trailingAnchor.constraint(equalTo: wrapper.trailingAnchor),
            card.topAnchor.constraint(equalTo: wrapper.topAnchor, constant: 12),
            card.bottomAnchor.constraint(equalTo: wrapper.bottomAnchor)
        ])
        styleSurface(card, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)

        let badgeLabel = textLabel(badge, font: NSFont.systemFont(ofSize: 10, weight: .bold), color: .white)
        let badgeWrap = roundedContainer(cornerRadius: 10, color: badgeColor)
        badgeWrap.translatesAutoresizingMaskIntoConstraints = false
        badgeWrap.wantsLayer = true
        badgeWrap.layer?.borderColor = NSColor(calibratedWhite: 1, alpha: 0.22).cgColor
        badgeWrap.layer?.borderWidth = 1
        badgeWrap.layer?.shadowColor = NSColor.black.cgColor
        badgeWrap.layer?.shadowOpacity = 0.20
        badgeWrap.layer?.shadowOffset = CGSize(width: 0, height: -1)
        badgeWrap.layer?.shadowRadius = 3
        badgeWrap.addSubview(badgeLabel)
        NSLayoutConstraint.activate([
            badgeLabel.leadingAnchor.constraint(equalTo: badgeWrap.leadingAnchor, constant: 8),
            badgeLabel.trailingAnchor.constraint(equalTo: badgeWrap.trailingAnchor, constant: -8),
            badgeLabel.topAnchor.constraint(equalTo: badgeWrap.topAnchor, constant: 2),
            badgeLabel.bottomAnchor.constraint(equalTo: badgeWrap.bottomAnchor, constant: -2)
        ])
        wrapper.addSubview(badgeWrap)

        let titleLabel = textLabel(title, font: NSFont.systemFont(ofSize: 15, weight: .bold), color: palette.primaryBlue)
        card.addSubview(titleLabel)
        let priceLabel = textLabel(price, font: NSFont.systemFont(ofSize: 12, weight: .bold), color: palette.textPrimary)
        card.addSubview(priceLabel)

        NSLayoutConstraint.activate([
            badgeWrap.centerXAnchor.constraint(equalTo: card.centerXAnchor),
            badgeWrap.centerYAnchor.constraint(equalTo: card.topAnchor),

            titleLabel.leadingAnchor.constraint(equalTo: card.leadingAnchor, constant: 16),
            titleLabel.topAnchor.constraint(equalTo: card.topAnchor, constant: 34),

            priceLabel.trailingAnchor.constraint(equalTo: card.trailingAnchor, constant: -16),
            priceLabel.topAnchor.constraint(equalTo: card.topAnchor, constant: 32)
        ])

        if let subtitle {
            let sub = textLabel(subtitle, font: NSFont.systemFont(ofSize: 10, weight: .semibold), color: palette.textSecondary)
            card.addSubview(sub)
            NSLayoutConstraint.activate([
                sub.trailingAnchor.constraint(equalTo: priceLabel.trailingAnchor),
                sub.topAnchor.constraint(equalTo: priceLabel.bottomAnchor, constant: 0)
            ])
        }

        if let strikePrice {
            let strike = textLabel(strikePrice, font: NSFont.systemFont(ofSize: 12, weight: .medium), color: NSColor.systemRed)
            card.addSubview(strike)
            NSLayoutConstraint.activate([
                strike.trailingAnchor.constraint(equalTo: priceLabel.trailingAnchor),
                strike.topAnchor.constraint(equalTo: priceLabel.bottomAnchor, constant: 4)
            ])
        }

        let click = NSClickGestureRecognizer(target: self, action: #selector(paywallPlanClicked(_:)))
        wrapper.addGestureRecognizer(click)
        premiumPlanByView[ObjectIdentifier(wrapper)] = plan
        paywallPlanViews[plan] = card

        return wrapper
    }

    func paywallFooterLinks() -> NSView {
        let wrap = NSView()
        wrap.translatesAutoresizingMaskIntoConstraints = false
        wrap.heightAnchor.constraint(equalToConstant: 34).isActive = true
        wrap.widthAnchor.constraint(greaterThanOrEqualToConstant: paywallContentWidth).isActive = true

        let row = NSStackView()
        row.translatesAutoresizingMaskIntoConstraints = false
        row.orientation = .horizontal
        row.distribution = .fillEqually
        row.alignment = .centerY
        row.spacing = 0
        wrap.addSubview(row)

        row.addArrangedSubview(footerLink("Privacy Policy"))
        row.addArrangedSubview(footerLink("Support"))
        row.addArrangedSubview(footerLink("Terms of Services"))

        NSLayoutConstraint.activate([
            row.leadingAnchor.constraint(equalTo: wrap.leadingAnchor),
            row.trailingAnchor.constraint(equalTo: wrap.trailingAnchor),
            row.topAnchor.constraint(equalTo: wrap.topAnchor),
            row.bottomAnchor.constraint(equalTo: wrap.bottomAnchor)
        ])

        return wrap
    }

    func footerLink(_ title: String) -> NSView {
        let container = HoverTrackingView()
        container.translatesAutoresizingMaskIntoConstraints = false
        let label = textLabel(title, font: NSFont.systemFont(ofSize: 12, weight: .semibold), color: palette.textSecondary)
        label.alignment = .center
        container.addSubview(label)

        NSLayoutConstraint.activate([
            label.centerXAnchor.constraint(equalTo: container.centerXAnchor),
            label.centerYAnchor.constraint(equalTo: container.centerYAnchor)
        ])

        let click = NSClickGestureRecognizer(target: self, action: #selector(paywallFooterLinkClicked(_:)))
        container.addGestureRecognizer(click)
        container.onHoverChanged = { hovering in
            label.textColor = hovering ? (self.darkModeEnabled ? .white : self.palette.textPrimary) : self.palette.textSecondary
        }
        container.onHoverChanged?(false)
        return container
    }

    func paywallBenefitsSection() -> NSView {
        let stack = NSStackView()
        stack.translatesAutoresizingMaskIntoConstraints = false
        stack.orientation = .vertical
        stack.spacing = 8
        stack.alignment = .leading
        stack.widthAnchor.constraint(greaterThanOrEqualToConstant: paywallContentWidth).isActive = true

        let rowOne = NSStackView()
        rowOne.translatesAutoresizingMaskIntoConstraints = false
        rowOne.orientation = .horizontal
        rowOne.spacing = 10
        rowOne.distribution = .fillEqually
        rowOne.alignment = .centerY
        rowOne.addArrangedSubview(paywallBenefitItem(icon: "📅", text: "Manage meetings"))
        rowOne.addArrangedSubview(paywallBenefitItem(icon: "🖼️", text: "Virtual backgrounds"))

        let rowTwo = NSStackView()
        rowTwo.translatesAutoresizingMaskIntoConstraints = false
        rowTwo.orientation = .horizontal
        rowTwo.spacing = 10
        rowTwo.distribution = .fillEqually
        rowTwo.alignment = .centerY
        rowTwo.addArrangedSubview(paywallBenefitItem(icon: "⚡", text: "Tools for productivity"))
        rowTwo.addArrangedSubview(paywallBenefitItem(icon: "🛟", text: "24/7 support"))

        stack.addArrangedSubview(rowOne)
        stack.addArrangedSubview(rowTwo)
        return stack
    }

    func paywallBenefitItem(icon: String, text: String) -> NSView {
        let card = roundedContainer(cornerRadius: 10, color: palette.inputBackground)
        card.translatesAutoresizingMaskIntoConstraints = false
        card.heightAnchor.constraint(equalToConstant: 36).isActive = true
        styleSurface(card, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)

        let iconWrap = roundedContainer(cornerRadius: 8, color: palette.inputBackground)
        iconWrap.translatesAutoresizingMaskIntoConstraints = false
        iconWrap.widthAnchor.constraint(equalToConstant: 24).isActive = true
        iconWrap.heightAnchor.constraint(equalToConstant: 24).isActive = true
        styleSurface(iconWrap, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)

        let iconLabel = textLabel(icon, font: NSFont.systemFont(ofSize: 12, weight: .medium), color: palette.primaryBlue)
        iconWrap.addSubview(iconLabel)
        NSLayoutConstraint.activate([
            iconLabel.centerXAnchor.constraint(equalTo: iconWrap.centerXAnchor),
            iconLabel.centerYAnchor.constraint(equalTo: iconWrap.centerYAnchor)
        ])

        let title = textLabel(text, font: NSFont.systemFont(ofSize: 11, weight: .medium), color: palette.textPrimary)

        card.addSubview(iconWrap)
        card.addSubview(title)
        NSLayoutConstraint.activate([
            iconWrap.leadingAnchor.constraint(equalTo: card.leadingAnchor, constant: 8),
            iconWrap.centerYAnchor.constraint(equalTo: card.centerYAnchor),
            title.leadingAnchor.constraint(equalTo: iconWrap.trailingAnchor, constant: 10),
            title.centerYAnchor.constraint(equalTo: card.centerYAnchor),
            title.trailingAnchor.constraint(lessThanOrEqualTo: card.trailingAnchor, constant: -8)
        ])
        return card
    }

    func zoomJoinModeTabs() -> NSView {
        let row = NSStackView()
        row.translatesAutoresizingMaskIntoConstraints = false
        row.orientation = .horizontal
        row.alignment = .centerY
        row.spacing = 28
        row.widthAnchor.constraint(greaterThanOrEqualToConstant: 780).isActive = true

        let idTab = joinModeTab("Join with ID", mode: .id)
        let urlTab = joinModeTab("Join with URL", mode: .url)
        row.addArrangedSubview(idTab)
        row.addArrangedSubview(urlTab)
        let spacer = NSView()
        spacer.translatesAutoresizingMaskIntoConstraints = false
        row.addArrangedSubview(spacer)

        zoomJoinModeViews[.id] = idTab
        zoomJoinModeViews[.url] = urlTab
        updateZoomJoinModeAppearance()
        return row
    }

    func joinModeTab(_ title: String, mode: ZoomJoinMode) -> NSView {
        let tab = HoverTrackingView()
        tab.translatesAutoresizingMaskIntoConstraints = false
        tab.wantsLayer = true
        tab.layer?.cornerRadius = 6
        tab.layer?.backgroundColor = NSColor.clear.cgColor
        tab.heightAnchor.constraint(equalToConstant: 30).isActive = true
        zoomJoinModeByView[ObjectIdentifier(tab)] = mode

        let label = textLabel(title, font: NSFont.systemFont(ofSize: 33 / 2, weight: .medium), color: palette.textPrimary)
        tab.addSubview(label)
        NSLayoutConstraint.activate([
            label.leadingAnchor.constraint(equalTo: tab.leadingAnchor, constant: 4),
            label.trailingAnchor.constraint(equalTo: tab.trailingAnchor, constant: -4),
            label.topAnchor.constraint(equalTo: tab.topAnchor, constant: 4),
            label.bottomAnchor.constraint(equalTo: tab.bottomAnchor, constant: -6)
        ])

        let click = NSClickGestureRecognizer(target: self, action: #selector(zoomJoinModeClicked(_:)))
        tab.addGestureRecognizer(click)
        return tab
    }

    func updateZoomJoinModeAppearance() {
        for (mode, tab) in zoomJoinModeViews {
            let selected = (mode == selectedZoomJoinMode)
            let textColor = selected ? palette.textPrimary : palette.textSecondary
            let label = tab.subviews.first { $0 is NSTextField } as? NSTextField
            label?.textColor = textColor

            // Keep the active tab visually underlined like the reference.
            if selected {
                if tab.subviews.contains(where: { $0.identifier?.rawValue == "modeUnderline" }) == false {
                    let underline = NSView()
                    underline.identifier = NSUserInterfaceItemIdentifier("modeUnderline")
                    underline.translatesAutoresizingMaskIntoConstraints = false
                    underline.wantsLayer = true
                    underline.layer?.backgroundColor = palette.primaryBlue.cgColor
                    tab.addSubview(underline)
                    NSLayoutConstraint.activate([
                        underline.leadingAnchor.constraint(equalTo: tab.leadingAnchor),
                        underline.trailingAnchor.constraint(equalTo: tab.trailingAnchor),
                        underline.bottomAnchor.constraint(equalTo: tab.bottomAnchor),
                        underline.heightAnchor.constraint(equalToConstant: 2)
                    ])
                }
            } else {
                tab.subviews
                    .filter { $0.identifier?.rawValue == "modeUnderline" }
                    .forEach { $0.removeFromSuperview() }
            }
        }
    }

    func joinWithIDHeading() -> NSView {
        let container = NSView()
        container.translatesAutoresizingMaskIntoConstraints = false

        let title = textLabel("Join with ID", font: typography.joinWithURLTitle, color: palette.textPrimary)
        title.alignment = .left
        title.setContentHuggingPriority(.defaultHigh, for: .horizontal)
        title.setContentCompressionResistancePriority(.required, for: .horizontal)

        let bar = NSView()
        bar.translatesAutoresizingMaskIntoConstraints = false
        bar.wantsLayer = true
        bar.layer?.backgroundColor = palette.primaryBlue.cgColor
        bar.heightAnchor.constraint(equalToConstant: 3).isActive = true

        container.addSubview(title)
        container.addSubview(bar)

        NSLayoutConstraint.activate([
            title.leadingAnchor.constraint(equalTo: container.leadingAnchor),
            title.topAnchor.constraint(equalTo: container.topAnchor),

            bar.leadingAnchor.constraint(equalTo: title.leadingAnchor),
            bar.topAnchor.constraint(equalTo: title.bottomAnchor, constant: 6),
            bar.widthAnchor.constraint(equalTo: title.widthAnchor),
            bar.bottomAnchor.constraint(equalTo: container.bottomAnchor),

            container.trailingAnchor.constraint(equalTo: title.trailingAnchor)
        ])

        return container
    }

    func zoomMeetingIDSection() -> NSView {
        let wrapper = NSView()
        wrapper.translatesAutoresizingMaskIntoConstraints = false

        let fieldsRow = NSStackView()
        fieldsRow.translatesAutoresizingMaskIntoConstraints = false
        fieldsRow.orientation = .horizontal
        fieldsRow.alignment = .top
        fieldsRow.distribution = .fillEqually
        fieldsRow.spacing = 12
        fieldsRow.addArrangedSubview(zoomInputField(title: "Meeting ID", placeholder: "Enter meeting ID..."))
        fieldsRow.addArrangedSubview(zoomInputField(title: "Meeting Passcode", placeholder: "Enter meeting passcode..."))

        let actions = NSStackView()
        actions.orientation = .horizontal
        actions.spacing = 10
        actions.translatesAutoresizingMaskIntoConstraints = false
        actions.alignment = .centerY
        actions.addArrangedSubview(actionButton(title: "Cancel", color: palette.cancelButton, textColor: palette.textSecondary, width: 110))
        actions.addArrangedSubview(actionButton(title: "Join", color: palette.primaryBlue, textColor: .white, width: 116))

        wrapper.addSubview(fieldsRow)
        wrapper.addSubview(actions)

        NSLayoutConstraint.activate([
            wrapper.widthAnchor.constraint(greaterThanOrEqualToConstant: 780),

            fieldsRow.leadingAnchor.constraint(equalTo: wrapper.leadingAnchor),
            fieldsRow.trailingAnchor.constraint(equalTo: wrapper.trailingAnchor),
            fieldsRow.topAnchor.constraint(equalTo: wrapper.topAnchor),

            actions.trailingAnchor.constraint(equalTo: wrapper.trailingAnchor),
            actions.topAnchor.constraint(equalTo: fieldsRow.bottomAnchor, constant: 14),
            actions.bottomAnchor.constraint(equalTo: wrapper.bottomAnchor)
        ])

        return wrapper
    }

    func zoomInputField(title: String, placeholder: String) -> NSView {
        let wrapper = NSView()
        wrapper.translatesAutoresizingMaskIntoConstraints = false

        let heading = textLabel(title, font: typography.fieldLabel, color: palette.textPrimary)
        let textFieldContainer = roundedContainer(cornerRadius: 10, color: palette.inputBackground)
        textFieldContainer.translatesAutoresizingMaskIntoConstraints = false
        textFieldContainer.heightAnchor.constraint(equalToConstant: 40).isActive = true
        styleSurface(textFieldContainer, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)

        let field = NSTextField(string: "")
        field.translatesAutoresizingMaskIntoConstraints = false
        field.isEditable = true
        field.isSelectable = true
        field.isBordered = false
        field.drawsBackground = false
        field.placeholderString = placeholder
        field.font = typography.inputPlaceholder
        field.textColor = palette.textPrimary
        field.focusRingType = .none
        textFieldContainer.addSubview(field)

        wrapper.addSubview(heading)
        wrapper.addSubview(textFieldContainer)

        NSLayoutConstraint.activate([
            heading.leadingAnchor.constraint(equalTo: wrapper.leadingAnchor),
            heading.topAnchor.constraint(equalTo: wrapper.topAnchor),

            textFieldContainer.leadingAnchor.constraint(equalTo: wrapper.leadingAnchor),
            textFieldContainer.trailingAnchor.constraint(equalTo: wrapper.trailingAnchor),
            textFieldContainer.topAnchor.constraint(equalTo: heading.bottomAnchor, constant: 10),
            textFieldContainer.bottomAnchor.constraint(equalTo: wrapper.bottomAnchor),

            field.leadingAnchor.constraint(equalTo: textFieldContainer.leadingAnchor, constant: 12),
            field.trailingAnchor.constraint(equalTo: textFieldContainer.trailingAnchor, constant: -12),
            field.centerYAnchor.constraint(equalTo: textFieldContainer.centerYAnchor)
        ])

        return wrapper
    }

    func joinWithURLHeading() -> NSView {
        let container = NSView()
        container.translatesAutoresizingMaskIntoConstraints = false

        let title = textLabel("Join with URL", font: typography.joinWithURLTitle, color: palette.textPrimary)
        title.alignment = .left
        title.setContentHuggingPriority(.defaultHigh, for: .horizontal)
        title.setContentCompressionResistancePriority(.required, for: .horizontal)

        let bar = NSView()
        bar.translatesAutoresizingMaskIntoConstraints = false
        bar.wantsLayer = true
        bar.layer?.backgroundColor = palette.primaryBlue.cgColor
        bar.heightAnchor.constraint(equalToConstant: 3).isActive = true

        container.addSubview(title)
        container.addSubview(bar)

        NSLayoutConstraint.activate([
            title.leadingAnchor.constraint(equalTo: container.leadingAnchor),
            title.topAnchor.constraint(equalTo: container.topAnchor),

            bar.leadingAnchor.constraint(equalTo: title.leadingAnchor),
            bar.topAnchor.constraint(equalTo: title.bottomAnchor, constant: 6),
            bar.widthAnchor.constraint(equalTo: title.widthAnchor),
            bar.bottomAnchor.constraint(equalTo: container.bottomAnchor),

            container.trailingAnchor.constraint(equalTo: title.trailingAnchor)
        ])

        return container
    }

    func meetingUrlSection() -> NSView {
        let wrapper = NSView()
        wrapper.translatesAutoresizingMaskIntoConstraints = false

        let title = textLabel("Meeting URL", font: typography.fieldLabel, color: palette.textSecondary)
        let textFieldContainer = roundedContainer(cornerRadius: 10, color: palette.inputBackground)
        textFieldContainer.translatesAutoresizingMaskIntoConstraints = false
        textFieldContainer.heightAnchor.constraint(equalToConstant: 40).isActive = true
        styleSurface(textFieldContainer, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)

        let urlField = NSTextField(string: "")
        urlField.translatesAutoresizingMaskIntoConstraints = false
        urlField.isEditable = true
        urlField.isSelectable = true
        urlField.isBordered = false
        urlField.drawsBackground = false
        urlField.placeholderString = "Enter meeting URL..."
        urlField.font = typography.inputPlaceholder
        urlField.textColor = palette.textPrimary
        urlField.focusRingType = .none
        textFieldContainer.addSubview(urlField)

        let actions = NSStackView()
        actions.orientation = .horizontal
        actions.spacing = 10
        actions.translatesAutoresizingMaskIntoConstraints = false
        actions.alignment = .centerY
        actions.addArrangedSubview(actionButton(title: "Cancel", color: palette.cancelButton, textColor: palette.textSecondary, width: 110))
        actions.addArrangedSubview(actionButton(title: "Join", color: palette.primaryBlue, textColor: .white, width: 116))

        wrapper.addSubview(title)
        wrapper.addSubview(textFieldContainer)
        wrapper.addSubview(actions)

        NSLayoutConstraint.activate([
            wrapper.widthAnchor.constraint(greaterThanOrEqualToConstant: 780),

            title.leadingAnchor.constraint(equalTo: wrapper.leadingAnchor),
            title.topAnchor.constraint(equalTo: wrapper.topAnchor),

            textFieldContainer.leadingAnchor.constraint(equalTo: wrapper.leadingAnchor),
            textFieldContainer.trailingAnchor.constraint(equalTo: wrapper.trailingAnchor),
            textFieldContainer.topAnchor.constraint(equalTo: title.bottomAnchor, constant: 10),

            urlField.leadingAnchor.constraint(equalTo: textFieldContainer.leadingAnchor, constant: 12),
            urlField.trailingAnchor.constraint(equalTo: textFieldContainer.trailingAnchor, constant: -12),
            urlField.centerYAnchor.constraint(equalTo: textFieldContainer.centerYAnchor),

            actions.trailingAnchor.constraint(equalTo: wrapper.trailingAnchor),
            actions.topAnchor.constraint(equalTo: textFieldContainer.bottomAnchor, constant: 14),
            actions.bottomAnchor.constraint(equalTo: wrapper.bottomAnchor)
        ])

        return wrapper
    }

    func scheduleHeader() -> NSView {
        let row = NSStackView()
        row.translatesAutoresizingMaskIntoConstraints = false
        row.orientation = .horizontal
        row.alignment = .centerY
        row.distribution = .fill
        row.spacing = 12

        row.addArrangedSubview(textLabel("Schedule", font: typography.sectionTitleBold, color: palette.textPrimary))

        let spacer = NSView()
        spacer.translatesAutoresizingMaskIntoConstraints = false
        row.addArrangedSubview(spacer)
        spacer.setContentHuggingPriority(.defaultLow, for: .horizontal)

        row.addArrangedSubview(iconRoundButton("?", size: 34))
        row.addArrangedSubview(iconRoundButton("⟳", size: 34))

        let filter = roundedContainer(cornerRadius: 8, color: palette.inputBackground)
        filter.translatesAutoresizingMaskIntoConstraints = false
        filter.widthAnchor.constraint(equalToConstant: 156).isActive = true
        filter.heightAnchor.constraint(equalToConstant: 34).isActive = true
        styleSurface(filter, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)
        let filterText = textLabel("All", font: typography.filterText, color: palette.textSecondary)
        let arrow = textLabel("▾", font: typography.filterArrow, color: palette.textMuted)
        filterText.translatesAutoresizingMaskIntoConstraints = false
        arrow.translatesAutoresizingMaskIntoConstraints = false
        filter.addSubview(filterText)
        filter.addSubview(arrow)

        NSLayoutConstraint.activate([
            filterText.leadingAnchor.constraint(equalTo: filter.leadingAnchor, constant: 12),
            filterText.centerYAnchor.constraint(equalTo: filter.centerYAnchor),
            arrow.trailingAnchor.constraint(equalTo: filter.trailingAnchor, constant: -10),
            arrow.centerYAnchor.constraint(equalTo: filter.centerYAnchor)
        ])

        row.addArrangedSubview(filter)
        row.widthAnchor.constraint(greaterThanOrEqualToConstant: 780).isActive = true
        return row
    }

    func scheduleCardsRow() -> NSView {
        let row = NSStackView()
        row.translatesAutoresizingMaskIntoConstraints = false
        row.orientation = .horizontal
        row.spacing = 10
        row.alignment = .top
        row.distribution = .fill
        row.setContentHuggingPriority(.defaultHigh, for: .horizontal)
        row.heightAnchor.constraint(equalToConstant: 136).isActive = true

        row.addArrangedSubview(scheduleCard())
        row.addArrangedSubview(scheduleCard())
        return row
    }

    func scheduleCard() -> NSView {
        let cardWidth: CGFloat = 264

        let card = roundedContainer(cornerRadius: 10, color: palette.sectionCard)
        styleSurface(card, borderColor: palette.inputBorder, borderWidth: 1, shadow: true)
        card.translatesAutoresizingMaskIntoConstraints = false
        card.widthAnchor.constraint(equalToConstant: cardWidth).isActive = true
        card.heightAnchor.constraint(equalToConstant: 136).isActive = true

        let icon = roundedContainer(cornerRadius: 5, color: palette.meetingBadge)
        icon.translatesAutoresizingMaskIntoConstraints = false
        icon.widthAnchor.constraint(equalToConstant: 22).isActive = true
        icon.heightAnchor.constraint(equalToConstant: 22).isActive = true
        let iconText = textLabel("••", font: typography.cardIcon, color: .white)
        iconText.translatesAutoresizingMaskIntoConstraints = false
        icon.addSubview(iconText)
        NSLayoutConstraint.activate([
            iconText.centerXAnchor.constraint(equalTo: icon.centerXAnchor),
            iconText.centerYAnchor.constraint(equalTo: icon.centerYAnchor)
        ])

        let title = textLabel("General Meeting", font: typography.cardTitle, color: palette.textPrimary)
        let subtitle = textLabel("Baisakhi", font: typography.cardSubtitle, color: palette.textPrimary)
        let time = textLabel("12:00 AM - 11:59 PM", font: typography.cardTime, color: palette.textSecondary)

        card.addSubview(icon)
        card.addSubview(title)
        card.addSubview(subtitle)
        card.addSubview(time)

        NSLayoutConstraint.activate([
            icon.leadingAnchor.constraint(equalTo: card.leadingAnchor, constant: 10),
            icon.topAnchor.constraint(equalTo: card.topAnchor, constant: 10),

            title.leadingAnchor.constraint(equalTo: icon.trailingAnchor, constant: 6),
            title.centerYAnchor.constraint(equalTo: icon.centerYAnchor),
            title.trailingAnchor.constraint(lessThanOrEqualTo: card.trailingAnchor, constant: -10),

            subtitle.leadingAnchor.constraint(equalTo: card.leadingAnchor, constant: 10),
            subtitle.topAnchor.constraint(equalTo: icon.bottomAnchor, constant: 7),

            time.leadingAnchor.constraint(equalTo: card.leadingAnchor, constant: 10),
            time.topAnchor.constraint(equalTo: subtitle.bottomAnchor, constant: 4)
        ])

        return card
    }
}

extension ViewController: NSTextFieldDelegate {
    func control(_ control: NSControl, textView: NSTextView, doCommandBy commandSelector: Selector) -> Bool {
        if control === browseAddressField, commandSelector == #selector(NSResponder.insertNewline(_:)) {
            browseOpenAddressClicked(nil)
            return true
        }
        return false
    }
}

/// Ensures `NSClickGestureRecognizer` on the row receives clicks instead of child label/image views swallowing them.
private class RowHitTestView: NSView {
    override func hitTest(_ point: NSPoint) -> NSView? {
        return bounds.contains(point) ? self : nil
    }
}

private final class HoverTrackingView: RowHitTestView {
    var onHoverChanged: ((Bool) -> Void)?
    var showsHandCursor = true

    private var trackingAreaRef: NSTrackingArea?
    private var isHovering = false {
        didSet {
            guard isHovering != oldValue else { return }
            onHoverChanged?(isHovering)
        }
    }

    override func updateTrackingAreas() {
        super.updateTrackingAreas()
        if let trackingAreaRef {
            removeTrackingArea(trackingAreaRef)
        }
        let options: NSTrackingArea.Options = [
            .activeInKeyWindow,
            .inVisibleRect,
            .mouseEnteredAndExited
        ]
        let area = NSTrackingArea(rect: bounds, options: options, owner: self, userInfo: nil)
        addTrackingArea(area)
        trackingAreaRef = area
    }

    override func mouseEntered(with event: NSEvent) {
        super.mouseEntered(with: event)
        isHovering = true
    }

    override func mouseExited(with event: NSEvent) {
        super.mouseExited(with: event)
        isHovering = false
    }

    override func resetCursorRects() {
        super.resetCursorRects()
        guard showsHandCursor else { return }
        addCursorRect(bounds, cursor: .pointingHand)
    }
}

/// Hover tracking without overriding hit-testing; keeps controls like text fields interactive.
private final class HoverSurfaceView: NSView {
    var onHoverChanged: ((Bool) -> Void)?

    private var trackingAreaRef: NSTrackingArea?
    private var isHovering = false {
        didSet {
            guard isHovering != oldValue else { return }
            onHoverChanged?(isHovering)
        }
    }

    override func updateTrackingAreas() {
        super.updateTrackingAreas()
        if let trackingAreaRef {
            removeTrackingArea(trackingAreaRef)
        }
        let options: NSTrackingArea.Options = [
            .activeInKeyWindow,
            .inVisibleRect,
            .mouseEnteredAndExited
        ]
        let area = NSTrackingArea(rect: bounds, options: options, owner: self, userInfo: nil)
        addTrackingArea(area)
        trackingAreaRef = area
    }

    override func mouseEntered(with event: NSEvent) {
        super.mouseEntered(with: event)
        isHovering = true
    }

    override func mouseExited(with event: NSEvent) {
        super.mouseExited(with: event)
        isHovering = false
    }
}

private final class SettingsMenuViewController: NSViewController {
    private let palette: Palette
    private let typography: Typography
    private let onToggleDarkMode: (Bool) -> Void
    private let onAction: (SettingsAction) -> Void

    private var darkToggle: NSSwitch?

    init(
        palette: Palette,
        typography: Typography,
        darkModeEnabled: Bool,
        onToggleDarkMode: @escaping (Bool) -> Void,
        onAction: @escaping (SettingsAction) -> Void
    ) {
        self.palette = palette
        self.typography = typography
        self.onToggleDarkMode = onToggleDarkMode
        self.onAction = onAction
        super.init(nibName: nil, bundle: nil)
        self.view = makeView(darkModeEnabled: darkModeEnabled)
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        nil
    }

    func setDarkModeEnabled(_ enabled: Bool) {
        darkToggle?.state = enabled ? .on : .off
    }

    private func makeView(darkModeEnabled: Bool) -> NSView {
        let root = NSView()
        root.translatesAutoresizingMaskIntoConstraints = false

        let card = roundedCard()
        root.addSubview(card)
        NSLayoutConstraint.activate([
            card.leadingAnchor.constraint(equalTo: root.leadingAnchor),
            card.trailingAnchor.constraint(equalTo: root.trailingAnchor),
            card.topAnchor.constraint(equalTo: root.topAnchor),
            card.bottomAnchor.constraint(equalTo: root.bottomAnchor),
            root.widthAnchor.constraint(equalToConstant: 260)
        ])

        let stack = NSStackView()
        stack.translatesAutoresizingMaskIntoConstraints = false
        stack.orientation = .vertical
        stack.spacing = 6
        stack.alignment = .leading
        card.addSubview(stack)

        NSLayoutConstraint.activate([
            stack.leadingAnchor.constraint(equalTo: card.leadingAnchor, constant: 14),
            stack.trailingAnchor.constraint(equalTo: card.trailingAnchor, constant: -14),
            stack.topAnchor.constraint(equalTo: card.topAnchor, constant: 14),
            stack.bottomAnchor.constraint(lessThanOrEqualTo: card.bottomAnchor, constant: -14)
        ])

        stack.addArrangedSubview(settingsDarkModeRow(enabled: darkModeEnabled))
        stack.addArrangedSubview(settingsActionRow(icon: "⟳", title: "Restore", action: .restore))
        stack.addArrangedSubview(settingsActionRow(icon: "★", title: "Rate Us", action: .rateUs))
        stack.addArrangedSubview(settingsActionRow(icon: "💬", title: "Support", action: .support))
        stack.addArrangedSubview(settingsActionRow(icon: "⋯", title: "More Apps", action: .moreApps))
        stack.addArrangedSubview(settingsActionRow(icon: "⤴︎", title: "Share App", action: .shareApp))

        for v in stack.arrangedSubviews {
            v.widthAnchor.constraint(equalTo: stack.widthAnchor).isActive = true
        }

        return root
    }

    private func roundedCard() -> NSView {
        let view = NSView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.wantsLayer = true
        view.layer?.cornerRadius = 12
        view.layer?.backgroundColor = palette.sectionCard.cgColor
        view.layer?.borderColor = palette.inputBorder.cgColor
        view.layer?.borderWidth = 1
        view.layer?.shadowColor = NSColor.black.cgColor
        view.layer?.shadowOpacity = 0.28
        view.layer?.shadowOffset = CGSize(width: 0, height: -1)
        view.layer?.shadowRadius = 10
        return view
    }

    private func settingsDarkModeRow(enabled: Bool) -> NSView {
        let row = NSView()
        row.translatesAutoresizingMaskIntoConstraints = false
        row.heightAnchor.constraint(equalToConstant: 44).isActive = true
        row.wantsLayer = true
        row.layer?.cornerRadius = 10

        let icon = NSTextField(labelWithString: "◐")
        icon.translatesAutoresizingMaskIntoConstraints = false
        icon.font = NSFont.systemFont(ofSize: 18, weight: .medium)
        icon.textColor = palette.textPrimary

        let title = NSTextField(labelWithString: "Dark Mode")
        title.translatesAutoresizingMaskIntoConstraints = false
        title.font = NSFont.systemFont(ofSize: 16, weight: .semibold)
        title.textColor = palette.textPrimary

        let toggle = NSSwitch()
        toggle.translatesAutoresizingMaskIntoConstraints = false
        toggle.state = enabled ? .on : .off
        toggle.target = self
        toggle.action = #selector(darkModeToggled(_:))
        darkToggle = toggle

        row.addSubview(icon)
        row.addSubview(title)
        row.addSubview(toggle)
        row.layer?.backgroundColor = NSColor.clear.cgColor

        NSLayoutConstraint.activate([
            icon.leadingAnchor.constraint(equalTo: row.leadingAnchor, constant: 4),
            icon.centerYAnchor.constraint(equalTo: row.centerYAnchor),

            title.leadingAnchor.constraint(equalTo: icon.trailingAnchor, constant: 10),
            title.centerYAnchor.constraint(equalTo: row.centerYAnchor),

            toggle.trailingAnchor.constraint(equalTo: row.trailingAnchor, constant: -2),
            toggle.centerYAnchor.constraint(equalTo: row.centerYAnchor)
        ])

        return row
    }

    private func settingsActionRow(icon: String, title: String, action: SettingsAction) -> NSView {
        let row = HoverTrackingView()
        row.translatesAutoresizingMaskIntoConstraints = false
        row.heightAnchor.constraint(equalToConstant: 42).isActive = true

        let iconLabel = NSTextField(labelWithString: icon)
        iconLabel.translatesAutoresizingMaskIntoConstraints = false
        iconLabel.font = NSFont.systemFont(ofSize: 18, weight: .medium)
        iconLabel.textColor = palette.textPrimary

        let titleLabel = NSTextField(labelWithString: title)
        titleLabel.translatesAutoresizingMaskIntoConstraints = false
        titleLabel.font = NSFont.systemFont(ofSize: 16, weight: .semibold)
        titleLabel.textColor = palette.textPrimary

        row.addSubview(iconLabel)
        row.addSubview(titleLabel)

        NSLayoutConstraint.activate([
            iconLabel.leadingAnchor.constraint(equalTo: row.leadingAnchor, constant: 4),
            iconLabel.centerYAnchor.constraint(equalTo: row.centerYAnchor),
            titleLabel.leadingAnchor.constraint(equalTo: iconLabel.trailingAnchor, constant: 10),
            titleLabel.centerYAnchor.constraint(equalTo: row.centerYAnchor)
        ])

        let click = NSClickGestureRecognizer(target: self, action: #selector(settingsActionClicked(_:)))
        row.addGestureRecognizer(click)
        row.identifier = NSUserInterfaceItemIdentifier(rawValue: "\(action.rawValue)")
        row.onHoverChanged = { hovering in
            row.wantsLayer = true
            row.layer?.cornerRadius = 10
            row.layer?.backgroundColor = (hovering ? self.palette.inputBackground : NSColor.clear).cgColor
        }
        row.onHoverChanged?(false)

        return row
    }

    @objc private func darkModeToggled(_ sender: NSSwitch) {
        onToggleDarkMode(sender.state == .on)
    }

    @objc private func settingsActionClicked(_ sender: NSClickGestureRecognizer) {
        guard let view = sender.view,
              let raw = Int(view.identifier?.rawValue ?? ""),
              let action = SettingsAction(rawValue: raw) else { return }
        onAction(action)
    }
}

private extension ViewController {
    func roundedContainer(cornerRadius: CGFloat, color: NSColor) -> NSView {
        let view = NSView()
        view.wantsLayer = true
        view.layer?.backgroundColor = color.cgColor
        view.layer?.cornerRadius = cornerRadius
        return view
    }

    func styleSurface(_ view: NSView, borderColor: NSColor, borderWidth: CGFloat, shadow: Bool) {
        view.layer?.borderColor = borderColor.cgColor
        view.layer?.borderWidth = borderWidth
        if shadow {
            view.layer?.shadowColor = NSColor.black.cgColor
            view.layer?.shadowOpacity = 0.18
            view.layer?.shadowOffset = CGSize(width: 0, height: -1)
            view.layer?.shadowRadius = 5
        }
    }

    func textLabel(_ text: String, font: NSFont, color: NSColor) -> NSTextField {
        let label = NSTextField(labelWithString: text)
        label.translatesAutoresizingMaskIntoConstraints = false
        label.textColor = color
        label.font = font
        return label
    }

    func iconLabel(_ text: String, size: CGFloat) -> NSTextField {
        let label = NSTextField(labelWithString: text)
        label.translatesAutoresizingMaskIntoConstraints = false
        label.font = NSFont.systemFont(ofSize: size)
        return label
    }

    func sidebarSectionTitle(_ text: String) -> NSTextField {
        let field = textLabel(text, font: typography.sidebarSection, color: palette.textMuted)
        field.alignment = .left
        return field
    }

    func sidebarItem(_ text: String, icon: String, page: SidebarPage, logoImageName: String? = nil, logoIconWidth: CGFloat = 18, logoHeightMultiplier: CGFloat = 1, logoTemplate: Bool = true, showsDisclosure: Bool = false) -> NSView {
        let item = HoverTrackingView()
        item.wantsLayer = true
        item.layer?.cornerRadius = 10
        item.layer?.backgroundColor = NSColor.clear.cgColor
        item.translatesAutoresizingMaskIntoConstraints = false
        item.heightAnchor.constraint(equalToConstant: 36).isActive = true
        item.layer?.borderWidth = 0
        sidebarPageByView[ObjectIdentifier(item)] = page

        let leadingView: NSView
        if let name = logoImageName, let logo = NSImage(named: name) {
            logo.isTemplate = true
            let imageView = NSImageView(image: logo)
            imageView.translatesAutoresizingMaskIntoConstraints = false
            imageView.imageScaling = .scaleProportionallyDown
            imageView.imageAlignment = .alignCenter
            imageView.isEditable = false
            leadingView = imageView
        } else {
            leadingView = textLabel(icon, font: typography.sidebarIcon, color: palette.textSecondary)
        }

        let titleLabel = textLabel(text, font: typography.sidebarItem, color: palette.textSecondary)
        titleLabel.alignment = .left

        item.addSubview(leadingView)
        item.addSubview(titleLabel)

        var constraints: [NSLayoutConstraint] = [
            leadingView.leadingAnchor.constraint(equalTo: item.leadingAnchor, constant: 12),
            leadingView.centerYAnchor.constraint(equalTo: item.centerYAnchor),
            titleLabel.leadingAnchor.constraint(equalTo: leadingView.trailingAnchor, constant: 8),
            titleLabel.centerYAnchor.constraint(equalTo: item.centerYAnchor)
        ]

        if showsDisclosure {
            let chevron = textLabel("›", font: NSFont.systemFont(ofSize: 22, weight: .semibold), color: palette.textSecondary)
            chevron.translatesAutoresizingMaskIntoConstraints = false
            chevron.alignment = .right
            item.addSubview(chevron)
            constraints.append(contentsOf: [
                chevron.trailingAnchor.constraint(equalTo: item.trailingAnchor, constant: -10),
                chevron.centerYAnchor.constraint(equalTo: item.centerYAnchor),
                titleLabel.trailingAnchor.constraint(lessThanOrEqualTo: chevron.leadingAnchor, constant: -8)
            ])
        } else {
            constraints.append(titleLabel.trailingAnchor.constraint(lessThanOrEqualTo: item.trailingAnchor, constant: -10))
        }

        if logoImageName != nil {
            let h = logoIconWidth * logoHeightMultiplier
            constraints.append(contentsOf: [
                leadingView.widthAnchor.constraint(equalToConstant: logoIconWidth),
                leadingView.heightAnchor.constraint(equalToConstant: h)
            ])
        }
        NSLayoutConstraint.activate(constraints)

        applySidebarRowStyle(item, page: page, logoTemplate: logoTemplate)
        item.onHoverChanged = { [weak self, weak item] hovering in
            guard let self, let item else { return }
            self.applySidebarRowStyle(item, page: page, logoTemplate: logoTemplate, hovering: hovering)
        }

        let click = NSClickGestureRecognizer(target: self, action: #selector(sidebarItemClicked(_:)))
        item.addGestureRecognizer(click)

        return item
    }

    func applySidebarRowStyle(_ item: NSView, page: SidebarPage, logoTemplate: Bool, hovering: Bool = false) {
        let selected = (page == selectedSidebarPage)
        let hoverColor = darkModeEnabled ? NSColor(calibratedWhite: 1, alpha: 0.07) : NSColor(calibratedWhite: 0, alpha: 0.08)
        item.layer?.backgroundColor = (selected ? palette.primaryBlue : (hovering ? hoverColor : NSColor.clear)).cgColor
        let tint = selected ? NSColor.white : palette.textSecondary
        let sidebarIconTint = darkModeEnabled ? tint : NSColor.black
        guard item.subviews.count >= 2 else { return }
        let leading = item.subviews[0]
        let title = item.subviews.first { $0 is NSTextField } as? NSTextField
        title?.textColor = tint
        // Optional disclosure chevron (if present) is the last text field.
        if let chevron = item.subviews.last as? NSTextField, chevron !== title {
            chevron.textColor = sidebarIconTint
        }
        if let imageView = leading as? NSImageView {
            if logoTemplate {
                imageView.contentTintColor = sidebarIconTint
            }
        } else if let iconField = leading as? NSTextField {
            iconField.textColor = sidebarIconTint
        }
    }

    func actionButton(title: String, color: NSColor, textColor: NSColor, width: CGFloat) -> NSView {
        let button = HoverTrackingView()
        button.wantsLayer = true
        button.layer?.cornerRadius = 9
        button.layer?.backgroundColor = color.cgColor
        button.translatesAutoresizingMaskIntoConstraints = false
        button.widthAnchor.constraint(equalToConstant: width).isActive = true
        button.heightAnchor.constraint(equalToConstant: 36).isActive = true
        styleSurface(button, borderColor: title == "Cancel" ? palette.inputBorder : palette.primaryBlueBorder, borderWidth: 1, shadow: false)
        if title == "Cancel" {
            button.layer?.backgroundColor = palette.cancelButton.cgColor
        }

        let label = textLabel(title, font: typography.buttonText, color: textColor)
        button.addSubview(label)
        NSLayoutConstraint.activate([
            label.centerXAnchor.constraint(equalTo: button.centerXAnchor),
            label.centerYAnchor.constraint(equalTo: button.centerYAnchor)
        ])

        let baseColor = (title == "Cancel") ? palette.cancelButton : color
        let hoverBlend = darkModeEnabled ? NSColor.white : NSColor.black
        let hoverColor = baseColor.blended(withFraction: 0.12, of: hoverBlend) ?? baseColor
        button.onHoverChanged = { hovering in
            button.layer?.backgroundColor = (hovering ? hoverColor : baseColor).cgColor
        }
        button.onHoverChanged?(false)

        return button
    }

    func iconRoundButton(_ symbol: String, size: CGFloat) -> NSView {
        let button = HoverTrackingView()
        button.wantsLayer = true
        button.layer?.cornerRadius = size / 2
        button.layer?.backgroundColor = palette.inputBackground.cgColor
        button.translatesAutoresizingMaskIntoConstraints = false
        button.widthAnchor.constraint(equalToConstant: size).isActive = true
        button.heightAnchor.constraint(equalToConstant: size).isActive = true
        styleSurface(button, borderColor: palette.inputBorder, borderWidth: 1, shadow: false)

        let label = textLabel(symbol, font: typography.iconButton, color: palette.textSecondary)
        button.addSubview(label)
        NSLayoutConstraint.activate([
            label.centerXAnchor.constraint(equalTo: button.centerXAnchor),
            label.centerYAnchor.constraint(equalTo: button.centerYAnchor)
        ])

        let baseColor = palette.inputBackground
        let hoverBlend = darkModeEnabled ? NSColor.white : NSColor.black
        let hoverColor = baseColor.blended(withFraction: 0.10, of: hoverBlend) ?? baseColor
        button.onHoverChanged = { hovering in
            button.layer?.backgroundColor = (hovering ? hoverColor : baseColor).cgColor
        }
        button.onHoverChanged?(false)

        return button
    }
}

private struct Palette {
    let pageBackground: NSColor
    let sidebarBackground: NSColor
    let sectionCard: NSColor
    let tabBarBackground: NSColor
    let tabIdleBackground: NSColor
    let inputBackground: NSColor
    let inputBorder: NSColor
    let primaryBlue: NSColor
    let primaryBlueBorder: NSColor
    let cancelButton: NSColor
    let meetingBadge: NSColor
    let separator: NSColor
    let textPrimary: NSColor
    let textSecondary: NSColor
    let textTertiary: NSColor
    let textMuted: NSColor

    init(isDarkMode: Bool) {
        if isDarkMode {
            pageBackground = NSColor(calibratedRed: 10.0 / 255.0, green: 11.0 / 255.0, blue: 12.0 / 255.0, alpha: 1)
            sidebarBackground = NSColor(calibratedRed: 16.0 / 255.0, green: 17.0 / 255.0, blue: 19.0 / 255.0, alpha: 1)
            sectionCard = NSColor(calibratedRed: 22.0 / 255.0, green: 23.0 / 255.0, blue: 26.0 / 255.0, alpha: 1)
            tabBarBackground = NSColor(calibratedRed: 22.0 / 255.0, green: 23.0 / 255.0, blue: 26.0 / 255.0, alpha: 1)
            tabIdleBackground = NSColor(calibratedRed: 22.0 / 255.0, green: 23.0 / 255.0, blue: 26.0 / 255.0, alpha: 1)
            inputBackground = NSColor(calibratedRed: 20.0 / 255.0, green: 21.0 / 255.0, blue: 24.0 / 255.0, alpha: 1)
            inputBorder = NSColor(calibratedRed: 38.0 / 255.0, green: 40.0 / 255.0, blue: 44.0 / 255.0, alpha: 1)
            primaryBlue = NSColor(calibratedRed: 27.0 / 255.0, green: 115.0 / 255.0, blue: 232.0 / 255.0, alpha: 1)
            primaryBlueBorder = NSColor(calibratedRed: 42.0 / 255.0, green: 118.0 / 255.0, blue: 220.0 / 255.0, alpha: 1)
            cancelButton = NSColor(calibratedRed: 20.0 / 255.0, green: 21.0 / 255.0, blue: 24.0 / 255.0, alpha: 1)
            meetingBadge = NSColor(calibratedRed: 0.88, green: 0.66, blue: 0.14, alpha: 1)
            separator = NSColor(calibratedRed: 26.0 / 255.0, green: 27.0 / 255.0, blue: 30.0 / 255.0, alpha: 1)
            textPrimary = NSColor(calibratedWhite: 0.98, alpha: 1)
            textSecondary = NSColor(calibratedWhite: 0.78, alpha: 1)
            textTertiary = NSColor(calibratedWhite: 0.66, alpha: 1)
            textMuted = NSColor(calibratedWhite: 0.44, alpha: 1)
        } else {
            pageBackground = NSColor(calibratedRed: 244.0 / 255.0, green: 246.0 / 255.0, blue: 249.0 / 255.0, alpha: 1)
            sidebarBackground = NSColor(calibratedRed: 232.0 / 255.0, green: 236.0 / 255.0, blue: 242.0 / 255.0, alpha: 1)
            sectionCard = NSColor.white
            tabBarBackground = NSColor.white
            tabIdleBackground = NSColor.white
            inputBackground = NSColor(calibratedRed: 247.0 / 255.0, green: 249.0 / 255.0, blue: 252.0 / 255.0, alpha: 1)
            inputBorder = NSColor(calibratedRed: 211.0 / 255.0, green: 218.0 / 255.0, blue: 228.0 / 255.0, alpha: 1)
            primaryBlue = NSColor(calibratedRed: 27.0 / 255.0, green: 115.0 / 255.0, blue: 232.0 / 255.0, alpha: 1)
            primaryBlueBorder = NSColor(calibratedRed: 42.0 / 255.0, green: 118.0 / 255.0, blue: 220.0 / 255.0, alpha: 1)
            cancelButton = NSColor(calibratedRed: 240.0 / 255.0, green: 243.0 / 255.0, blue: 248.0 / 255.0, alpha: 1)
            meetingBadge = NSColor(calibratedRed: 0.88, green: 0.66, blue: 0.14, alpha: 1)
            separator = NSColor(calibratedRed: 212.0 / 255.0, green: 219.0 / 255.0, blue: 229.0 / 255.0, alpha: 1)
            textPrimary = NSColor(calibratedRed: 32.0 / 255.0, green: 38.0 / 255.0, blue: 47.0 / 255.0, alpha: 1)
            textSecondary = NSColor(calibratedRed: 82.0 / 255.0, green: 92.0 / 255.0, blue: 107.0 / 255.0, alpha: 1)
            textTertiary = NSColor(calibratedRed: 110.0 / 255.0, green: 120.0 / 255.0, blue: 136.0 / 255.0, alpha: 1)
            textMuted = NSColor(calibratedRed: 134.0 / 255.0, green: 145.0 / 255.0, blue: 162.0 / 255.0, alpha: 1)
        }
    }
}

private struct Typography {
    let sidebarBrand = NSFont.systemFont(ofSize: 26, weight: .bold)
    let sidebarSection = NSFont.systemFont(ofSize: 11, weight: .medium)
    let sidebarIcon = NSFont.systemFont(ofSize: 12, weight: .medium)
    let sidebarItem = NSFont.systemFont(ofSize: 16, weight: .medium)

    let pageTitle = NSFont.systemFont(ofSize: 27, weight: .semibold)
    let joinWithURLTitle = NSFont.systemFont(ofSize: 17, weight: .semibold)
    let sectionTitleBold = NSFont.systemFont(ofSize: 25, weight: .bold)
    let dateHeading = NSFont.systemFont(ofSize: 18, weight: .medium)

    let tabIcon = NSFont.systemFont(ofSize: 13, weight: .regular)
    let tabTitle = NSFont.systemFont(ofSize: 31 / 2, weight: .semibold)

    let fieldLabel = NSFont.systemFont(ofSize: 15, weight: .medium)
    let inputPlaceholder = NSFont.systemFont(ofSize: 14, weight: .regular)
    let buttonText = NSFont.systemFont(ofSize: 16, weight: .medium)
    let filterText = NSFont.systemFont(ofSize: 15, weight: .regular)
    let filterArrow = NSFont.systemFont(ofSize: 12, weight: .regular)
    let iconButton = NSFont.systemFont(ofSize: 14, weight: .medium)

    let cardIcon = NSFont.systemFont(ofSize: 8, weight: .bold)
    let cardTitle = NSFont.systemFont(ofSize: 15, weight: .semibold)
    let cardSubtitle = NSFont.systemFont(ofSize: 13, weight: .bold)
    let cardTime = NSFont.systemFont(ofSize: 12, weight: .regular)
}

// MARK: - In-app browser (macOS WKWebView + chrome)
// Note: This target is AppKit/macOS. iOS would use WKWebView or SFSafariViewController; Android would use WebView or Custom Tabs.

private enum InAppBrowserURLPolicy: Equatable {
    case allowAll
    case whitelist(hostSuffixes: [String])
}

private func inAppBrowserURLAllowed(_ url: URL, policy: InAppBrowserURLPolicy) -> Bool {
    let scheme = (url.scheme ?? "").lowercased()
    if scheme == "about" { return true }
    guard scheme == "http" || scheme == "https" else { return false }
    guard let host = url.host?.lowercased() else { return false }
    switch policy {
    case .allowAll:
        return true
    case .whitelist(let suffixes):
        for suffix in suffixes {
            let s = suffix.lowercased()
            if host == s || host.hasSuffix("." + s) { return true }
        }
        return false
    }
}

private enum InAppBrowserWebKitSupport {
    static let sharedProcessPool = WKProcessPool()

    static func makeWebViewConfiguration() -> WKWebViewConfiguration {
        let config = WKWebViewConfiguration()
        config.processPool = sharedProcessPool
        config.websiteDataStore = .default()
        config.preferences.javaScriptCanOpenWindowsAutomatically = true
        if #available(macOS 12.3, *) {
            config.preferences.isElementFullscreenEnabled = true
        }
        config.mediaTypesRequiringUserActionForPlayback = []
        if #available(macOS 11.0, *) {
            config.defaultWebpagePreferences.allowsContentJavaScript = true
        }
        config.applicationNameForUserAgent = "MeetingsApp/1.0"
        return config
    }
}

private final class InAppBrowserWindowController: NSWindowController {
    private static let defaultContentSize = NSSize(width: 1100, height: 760)
    private static let minimumContentSize = NSSize(width: 800, height: 520)

    private let browserViewController = InAppBrowserContainerViewController()

    init() {
        let browserWindow = NSWindow(
            contentRect: NSRect(origin: .zero, size: Self.defaultContentSize),
            styleMask: [.titled, .closable, .miniaturizable, .resizable],
            backing: .buffered,
            defer: false
        )
        browserWindow.title = "Browser"
        browserWindow.isRestorable = false
        browserWindow.setFrameAutosaveName("")
        browserWindow.minSize = browserWindow.frameRect(forContentRect: NSRect(origin: .zero, size: Self.minimumContentSize)).size
        browserWindow.center()
        browserWindow.contentViewController = browserViewController
        super.init(window: browserWindow)
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        nil
    }

    /// Resets size and position each time the browser is shown so a previously tiny window is never reused.
    func applyDefaultFrameCenteredOnVisibleScreen() {
        guard let w = window, let screen = w.screen ?? NSScreen.main else { return }
        let windowFrame = w.frameRect(forContentRect: NSRect(origin: .zero, size: Self.defaultContentSize))
        let vf = screen.visibleFrame
        var frame = windowFrame
        frame.origin.x = vf.midX - frame.width / 2
        frame.origin.y = vf.midY - frame.height / 2
        if frame.maxX > vf.maxX { frame.origin.x = vf.maxX - frame.width }
        if frame.minX < vf.minX { frame.origin.x = vf.minX }
        if frame.maxY > vf.maxY { frame.origin.y = vf.maxY - frame.height }
        if frame.minY < vf.minY { frame.origin.y = vf.minY }
        w.setFrame(frame, display: true)
    }

    func load(url: URL, policy: InAppBrowserURLPolicy) {
        browserViewController.setNavigationPolicy(policy)
        browserViewController.load(url: url)
    }
}

private final class InAppBrowserContainerViewController: NSViewController, WKNavigationDelegate, WKUIDelegate, NSTextFieldDelegate {
    private var webView: WKWebView!
    private var webContainerView: NSView!
    private weak var urlField: NSTextField?
    private var backButton: NSButton!
    private var forwardButton: NSButton!
    private var reloadStopButton: NSButton!
    private var goButton: NSButton!
    private var progressBar: NSProgressIndicator!

    private var lastLoadedURL: URL?
    private var navigationPolicy: InAppBrowserURLPolicy = .allowAll
    private var processTerminateRetryCount = 0
    /// Includes fresh WKWebView instances so each retry gets a new WebContent process after a crash.
    private let maxProcessTerminateRetries = 3
    private var kvoTokens: [NSKeyValueObservation] = []

    deinit {
        kvoTokens.removeAll()
    }

    func setNavigationPolicy(_ policy: InAppBrowserURLPolicy) {
        navigationPolicy = policy
    }

    override func loadView() {
        let root = NSView()
        root.translatesAutoresizingMaskIntoConstraints = false

        let wv = makeWebView()
        webView = wv

        let webHost = NSView()
        webHost.translatesAutoresizingMaskIntoConstraints = false
        webHost.wantsLayer = true
        webHost.addSubview(wv)
        NSLayoutConstraint.activate([
            wv.leadingAnchor.constraint(equalTo: webHost.leadingAnchor),
            wv.trailingAnchor.constraint(equalTo: webHost.trailingAnchor),
            wv.topAnchor.constraint(equalTo: webHost.topAnchor),
            wv.bottomAnchor.constraint(equalTo: webHost.bottomAnchor)
        ])
        webContainerView = webHost

        let toolbar = NSStackView()
        toolbar.translatesAutoresizingMaskIntoConstraints = false
        toolbar.orientation = .horizontal
        toolbar.spacing = 8
        toolbar.alignment = .centerY
        toolbar.edgeInsets = NSEdgeInsets(top: 6, left: 10, bottom: 6, right: 10)

        backButton = makeToolbarButton(title: "◀", symbolName: "chevron.backward", accessibilityDescription: "Back")
        backButton.target = self
        backButton.action = #selector(goBack)
        forwardButton = makeToolbarButton(title: "▶", symbolName: "chevron.forward", accessibilityDescription: "Forward")
        forwardButton.target = self
        forwardButton.action = #selector(goForward)
        reloadStopButton = makeToolbarButton(title: "Reload", symbolName: "arrow.clockwise", accessibilityDescription: "Reload")
        reloadStopButton.target = self
        reloadStopButton.action = #selector(reloadOrStop)

        let field = NSTextField(string: "")
        field.translatesAutoresizingMaskIntoConstraints = false
        field.font = NSFont.systemFont(ofSize: 13, weight: .regular)
        field.placeholderString = "Address"
        field.cell?.sendsActionOnEndEditing = false
        field.delegate = self
        urlField = field

        goButton = NSButton(title: "Go", target: self, action: #selector(addressFieldSubmitted))
        goButton.translatesAutoresizingMaskIntoConstraints = false
        goButton.bezelStyle = .rounded

        toolbar.addArrangedSubview(backButton)
        toolbar.addArrangedSubview(forwardButton)
        toolbar.addArrangedSubview(reloadStopButton)
        toolbar.addArrangedSubview(field)
        toolbar.addArrangedSubview(goButton)
        field.widthAnchor.constraint(greaterThanOrEqualToConstant: 240).isActive = true

        let bar = NSProgressIndicator()
        bar.translatesAutoresizingMaskIntoConstraints = false
        bar.style = .bar
        bar.isIndeterminate = false
        bar.minValue = 0
        bar.maxValue = 1
        bar.doubleValue = 0
        bar.isHidden = true
        progressBar = bar

        let separator = NSBox()
        separator.translatesAutoresizingMaskIntoConstraints = false
        separator.boxType = .separator

        webView.navigationDelegate = self
        webView.uiDelegate = self

        root.addSubview(toolbar)
        root.addSubview(bar)
        root.addSubview(separator)
        root.addSubview(webHost)

        NSLayoutConstraint.activate([
            toolbar.leadingAnchor.constraint(equalTo: root.leadingAnchor),
            toolbar.trailingAnchor.constraint(equalTo: root.trailingAnchor),
            toolbar.topAnchor.constraint(equalTo: root.topAnchor),

            bar.leadingAnchor.constraint(equalTo: root.leadingAnchor),
            bar.trailingAnchor.constraint(equalTo: root.trailingAnchor),
            bar.topAnchor.constraint(equalTo: toolbar.bottomAnchor),
            bar.heightAnchor.constraint(equalToConstant: 3),

            separator.leadingAnchor.constraint(equalTo: root.leadingAnchor),
            separator.trailingAnchor.constraint(equalTo: root.trailingAnchor),
            separator.topAnchor.constraint(equalTo: bar.bottomAnchor),

            webHost.leadingAnchor.constraint(equalTo: root.leadingAnchor),
            webHost.trailingAnchor.constraint(equalTo: root.trailingAnchor),
            webHost.topAnchor.constraint(equalTo: separator.bottomAnchor),
            webHost.bottomAnchor.constraint(equalTo: root.bottomAnchor)
        ])

        view = root
        installWebViewObservers()
        syncToolbarFromWebView()
    }

    private func makeWebView() -> WKWebView {
        let wv = WKWebView(frame: .zero, configuration: InAppBrowserWebKitSupport.makeWebViewConfiguration())
        wv.translatesAutoresizingMaskIntoConstraints = false
        return wv
    }

    private func teardownWebViewObservers() {
        kvoTokens.removeAll()
    }

    /// New `WKWebView` = new WebContent process (helps after GPU/JS crashes on heavy sites like Meet).
    private func replaceWebViewAndLoad(url: URL) {
        teardownWebViewObservers()
        webView.navigationDelegate = nil
        webView.uiDelegate = nil
        webView.removeFromSuperview()

        let wv = makeWebView()
        webView = wv
        webContainerView.addSubview(wv)
        NSLayoutConstraint.activate([
            wv.leadingAnchor.constraint(equalTo: webContainerView.leadingAnchor),
            wv.trailingAnchor.constraint(equalTo: webContainerView.trailingAnchor),
            wv.topAnchor.constraint(equalTo: webContainerView.topAnchor),
            wv.bottomAnchor.constraint(equalTo: webContainerView.bottomAnchor)
        ])
        webView.navigationDelegate = self
        webView.uiDelegate = self
        installWebViewObservers()
        syncToolbarFromWebView()
        webView.load(URLRequest(url: url, cachePolicy: .reloadIgnoringLocalAndRemoteCacheData))
    }

    private func makeToolbarButton(title: String, symbolName: String, accessibilityDescription: String) -> NSButton {
        let b = NSButton()
        b.translatesAutoresizingMaskIntoConstraints = false
        b.bezelStyle = .texturedRounded
        b.setAccessibilityLabel(accessibilityDescription)
        if #available(macOS 11.0, *), let img = NSImage(systemSymbolName: symbolName, accessibilityDescription: accessibilityDescription) {
            b.image = img
            b.imagePosition = .imageOnly
        } else {
            b.title = title
        }
        b.widthAnchor.constraint(greaterThanOrEqualToConstant: 32).isActive = true
        return b
    }

    private func installWebViewObservers() {
        kvoTokens.append(webView.observe(\.canGoBack, options: [.new]) { [weak self] _, _ in
            self?.syncToolbarFromWebView()
        })
        kvoTokens.append(webView.observe(\.canGoForward, options: [.new]) { [weak self] _, _ in
            self?.syncToolbarFromWebView()
        })
        kvoTokens.append(webView.observe(\.isLoading, options: [.new]) { [weak self] _, _ in
            self?.syncToolbarFromWebView()
        })
        kvoTokens.append(webView.observe(\.estimatedProgress, options: [.new]) { [weak self] _, _ in
            self?.syncProgressFromWebView()
        })
        kvoTokens.append(webView.observe(\.title, options: [.new]) { [weak self] _, _ in
            self?.syncWindowTitle()
        })
        kvoTokens.append(webView.observe(\.url, options: [.new]) { [weak self] _, _ in
            self?.syncAddressFieldFromWebView()
        })
    }

    private func syncToolbarFromWebView() {
        backButton?.isEnabled = webView.canGoBack
        forwardButton?.isEnabled = webView.canGoForward
        if webView.isLoading {
            if #available(macOS 11.0, *), let img = NSImage(systemSymbolName: "xmark", accessibilityDescription: "Stop") {
                reloadStopButton.image = img
                reloadStopButton.imagePosition = .imageOnly
                reloadStopButton.title = ""
            } else {
                reloadStopButton.title = "Stop"
            }
        } else {
            if #available(macOS 11.0, *), let img = NSImage(systemSymbolName: "arrow.clockwise", accessibilityDescription: "Reload") {
                reloadStopButton.image = img
                reloadStopButton.imagePosition = .imageOnly
                reloadStopButton.title = ""
            } else {
                reloadStopButton.title = "Reload"
            }
        }
        syncProgressFromWebView()
    }

    private func syncProgressFromWebView() {
        guard let progressBar else { return }
        if webView.isLoading {
            progressBar.isHidden = false
            progressBar.doubleValue = webView.estimatedProgress
        } else {
            progressBar.isHidden = true
            progressBar.doubleValue = 0
        }
    }

    private func syncAddressFieldFromWebView() {
        guard let urlField, urlField.currentEditor() == nil, let url = webView.url else { return }
        urlField.stringValue = url.absoluteString
    }

    private func syncWindowTitle() {
        let t = webView.title?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
        let host = webView.url?.host ?? ""
        view.window?.title = t.isEmpty ? (host.isEmpty ? "Browser" : host) : t
    }

    func load(url: URL) {
        lastLoadedURL = url
        processTerminateRetryCount = 0
        urlField?.stringValue = url.absoluteString
        webView.load(URLRequest(url: url))
        syncWindowTitle()
    }

    @objc private func goBack() {
        webView.goBack()
    }

    @objc private func goForward() {
        webView.goForward()
    }

    @objc private func reloadOrStop() {
        if webView.isLoading {
            webView.stopLoading()
        } else {
            webView.reload()
        }
    }

    @objc private func addressFieldSubmitted() {
        let raw = urlField?.stringValue.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
        guard raw.isEmpty == false else { return }
        var normalized = raw
        if normalized.lowercased().hasPrefix("http://") == false && normalized.lowercased().hasPrefix("https://") == false {
            normalized = "https://\(normalized)"
        }
        guard let url = URL(string: normalized),
              let scheme = url.scheme?.lowercased(),
              scheme == "http" || scheme == "https",
              url.host != nil
        else {
            let alert = NSAlert()
            alert.messageText = "Invalid address"
            alert.informativeText = "Enter a valid web address, for example https://example.com"
            alert.addButton(withTitle: "OK")
            alert.runModal()
            return
        }
        guard inAppBrowserURLAllowed(url, policy: navigationPolicy) else {
            presentBlockedHostAlert()
            return
        }
        load(url: url)
    }

    private func presentBlockedHostAlert() {
        let alert = NSAlert()
        alert.messageText = "Address not allowed"
        alert.informativeText = "This URL is not permitted with the current in-app browser policy (whitelist)."
        alert.addButton(withTitle: "OK")
        alert.runModal()
    }

    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        processTerminateRetryCount = 0
        syncAddressFieldFromWebView()
        syncWindowTitle()
    }

    func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
        let nsError = error as NSError
        if nsError.code == NSURLErrorCancelled {
            return
        }
        let alert = NSAlert()
        alert.messageText = "Unable to load page"
        alert.informativeText = "Could not load this page in the in-app browser.\n\n\(error.localizedDescription)"
        alert.addButton(withTitle: "Try Again")
        alert.addButton(withTitle: "OK")
        if alert.runModal() == .alertFirstButtonReturn, let url = lastLoadedURL {
            processTerminateRetryCount = 0
            webView.load(URLRequest(url: url))
        }
    }

    func webViewWebContentProcessDidTerminate(_ webView: WKWebView) {
        guard let url = lastLoadedURL else { return }

        if processTerminateRetryCount < maxProcessTerminateRetries {
            processTerminateRetryCount += 1
            replaceWebViewAndLoad(url: url)
            return
        }

        let alert = NSAlert()
        alert.messageText = "Page stopped loading"
        alert.informativeText =
            "The in-app browser closed this page unexpectedly. You can try loading it again in this same window."
        alert.addButton(withTitle: "Try Again")
        alert.addButton(withTitle: "OK")
        if alert.runModal() == .alertFirstButtonReturn {
            processTerminateRetryCount = 0
            replaceWebViewAndLoad(url: url)
        }
    }

    func webView(
        _ webView: WKWebView,
        decidePolicyFor navigationAction: WKNavigationAction,
        decisionHandler: @escaping (WKNavigationActionPolicy) -> Void
    ) {
        guard let url = navigationAction.request.url else {
            decisionHandler(.allow)
            return
        }
        let scheme = (url.scheme ?? "").lowercased()
        if scheme == "mailto" || scheme == "tel" {
            decisionHandler(.cancel)
            return
        }
        if inAppBrowserURLAllowed(url, policy: navigationPolicy) == false {
            if navigationAction.targetFrame?.isMainFrame != false {
                DispatchQueue.main.async { [weak self] in
                    self?.presentBlockedHostAlert()
                }
            }
            decisionHandler(.cancel)
            return
        }
        decisionHandler(.allow)
    }

    func webView(
        _ webView: WKWebView,
        createWebViewWith configuration: WKWebViewConfiguration,
        for navigationAction: WKNavigationAction,
        windowFeatures: WKWindowFeatures
    ) -> WKWebView? {
        if navigationAction.targetFrame == nil, let requestURL = navigationAction.request.url {
            if inAppBrowserURLAllowed(requestURL, policy: navigationPolicy) {
                webView.load(URLRequest(url: requestURL))
            } else {
                presentBlockedHostAlert()
            }
        }
        return nil
    }

    func control(_ control: NSControl, textView: NSTextView, doCommandBy commandSelector: Selector) -> Bool {
        if control === urlField, commandSelector == #selector(NSResponder.insertNewline(_:)) {
            addressFieldSubmitted()
            return true
        }
        return false
    }
}