'use client';

import { useState, useEffect, useCallback, useRef, useMemo } from 'react';
import { useAppStore } from '@/stores/app-store';
import type { InvoiceRow, View, ChatMessage } from '@/stores/app-store';
import {
  Upload,
  FileText,
  BarChart3,
  Bot,
  Download,
  CreditCard,
  Key,
  User,
  LogOut,
  Menu,
  X,
  ChevronDown,
  ChevronUp,
  Search,
  Trash2,
  Send,
  Copy,
  Eye,
  EyeOff,
  AlertCircle,
  CheckCircle,
  Loader2,
  ArrowRight,
  Sparkles,
  Shield,
  Zap,
  Globe,
  Layers,
  RefreshCw,
  FileDown,
  FileJson,
  Quote,
  ChevronRight,
  ScanLine,
  Database,
  Lock,
  Mail,
  UserPlus,
  Inbox,
  MessageSquare,
  CircleDollarSign,
  CopyCheck,
  Terminal,
  ArrowLeft,
  Crown,
  Building2,
  Check,
  MousePointerClick,
  TrendingUp,
  Bell,
  Clock,
  Pencil,
  LogIn,
  Sun,
  Moon,
  ArrowUpDown,
  Command,
  Settings,
} from 'lucide-react';
import type { LucideIcon } from 'lucide-react';
import { toast } from 'sonner';
import {
  AreaChart, Area, BarChart, Bar, PieChart, Pie, Cell,
  XAxis, YAxis, Tooltip, ResponsiveContainer, CartesianGrid,
} from 'recharts';
import { PLAN_LIMITS, PLAN_LABELS, PLAN_PRICES } from '@/lib/auth';
import { useTheme } from 'next-themes';

// ─── Helpers ────────────────────────────────────────────────────────────────────

const currencyFmt = new Intl.NumberFormat('en-US', {
  style: 'currency',
  currency: 'USD',
});

function formatCurrency(amount: number | null, currency?: string): string {
  if (amount === null || amount === undefined) return '--';
  try {
    return new Intl.NumberFormat('en-US', {
      style: 'currency',
      currency: currency || 'USD',
    }).format(amount);
  } catch {
    return currency ? `${currency} ${amount.toFixed(2)}` : `$${amount.toFixed(2)}`;
  }
}

function getPasswordStrength(pw: string): { label: string; color: string; width: string } {
  if (!pw) return { label: '', color: 'bg-zinc-700', width: 'w-0' };
  let score = 0;
  if (pw.length >= 6) score++;
  if (pw.length >= 10) score++;
  if (/[A-Z]/.test(pw)) score++;
  if (/[0-9]/.test(pw)) score++;
  if (/[^A-Za-z0-9]/.test(pw)) score++;
  if (score <= 2) return { label: 'Weak', color: 'bg-red-500', width: 'w-1/3' };
  if (score <= 3) return { label: 'Medium', color: 'bg-amber-500', width: 'w-2/3' };
  return { label: 'Strong', color: 'bg-green-500', width: 'w-full' };
}

const DASH_TABS = [
  { id: 'upload', label: 'Upload', icon: Upload },
  { id: 'invoices', label: 'Invoices', icon: FileText },
  { id: 'analytics', label: 'Analytics', icon: BarChart3 },
  { id: 'chat', label: 'AI Chat', icon: Bot },
  { id: 'export', label: 'Export', icon: Download },
  { id: 'upgrade', label: 'Upgrade', icon: Crown },
  { id: 'api', label: 'API Access', icon: Key },
  { id: 'profile', label: 'Profile', icon: User },
  { id: 'activity', label: 'Activity', icon: Clock },
  { id: 'settings', label: 'Settings', icon: Settings },
] as const;

function relativeTime(dateStr: string): string {
  const now = Date.now();
  const then = new Date(dateStr).getTime();
  const diffMs = now - then;
  const diffMins = Math.floor(diffMs / 60000);
  if (diffMins < 1) return 'Just now';
  if (diffMins < 60) return `${diffMins}m ago`;
  const diffHours = Math.floor(diffMins / 60);
  if (diffHours < 24) return `${diffHours}h ago`;
  const diffDays = Math.floor(diffHours / 24);
  if (diffDays < 30) return `${diffDays}d ago`;
  return new Date(dateStr).toLocaleDateString('en-US', { month: 'short', day: 'numeric' });
}

// ─── Main Page Component ────────────────────────────────────────────────────────

export default function Home() {
  const store = useAppStore();
  const { theme, setTheme } = useTheme();

  // ── Local Auth State ──
  const [authMode, setAuthMode] = useState<'login' | 'signup'>('login');
  const [loginEmail, setLoginEmail] = useState('');
  const [loginPassword, setLoginPassword] = useState('');
  const [signupName, setSignupName] = useState('');
  const [signupEmail, setSignupEmail] = useState('');
  const [signupPassword, setSignupPassword] = useState('');
  const [signupConfirm, setSignupConfirm] = useState('');
  const [authLoading, setAuthLoading] = useState(false);
  const [authError, setAuthError] = useState('');

  // ── Dashboard Local State ──
  const [invoiceSearch, setInvoiceSearch] = useState('');
  const [invoiceFilter, setInvoiceFilter] = useState('all');
  const [expandedInvoice, setExpandedInvoice] = useState<string | null>(null);
  const [selectedInvoices, setSelectedInvoices] = useState<Set<string>>(new Set());
  const [chatInput, setChatInput] = useState('');
  const [showApiKey, setShowApiKey] = useState(false);
  const [profileCurrentPw, setProfileCurrentPw] = useState('');
  const [profileNewPw, setProfileNewPw] = useState('');
  const [profileConfirmPw, setProfileConfirmPw] = useState('');
  const [profilePwLoading, setProfilePwLoading] = useState(false);

  const [showScrollTop, setShowScrollTop] = useState(false);

  // ── Landing Mobile Nav ──
  const [mobileMenuOpen, setMobileMenuOpen] = useState(false);
  const [dashMobileMenu, setDashMobileMenu] = useState(false);

  const [editingInvoice, setEditingInvoice] = useState<InvoiceRow | null>(null);
  const [editForm, setEditForm] = useState<Record<string, string>>({});
  const [editSaving, setEditSaving] = useState(false);
  const [dateFrom, setDateFrom] = useState('');
  const [dateTo, setDateTo] = useState('');
  const [sortField, setSortField] = useState<string>('createdAt');
  const [sortDir, setSortDir] = useState<'asc' | 'desc'>('desc');

  // ── Activity Items (real API) ──
  const [activityLogs, setActivityLogs] = useState<Array<{id:string;type:string;title:string;description:string;createdAt:string;metadata:string|null}>>([]);
  const [activityLoading, setActivityLoading] = useState(false);

  const fetchActivity = useCallback(async () => {
    setActivityLoading(true);
    try {
      const res = await fetch('/api/activity');
      if (res.ok) {
        const data = await res.json();
        setActivityLogs(data.activities);
      }
    } catch { /* silent */ }
    finally { setActivityLoading(false); }
  }, []);

  useEffect(() => {
    if (store.view === 'dashboard' && store.activeDashTab === 'activity') {
      fetchActivity();
    }
  }, [store.view, store.activeDashTab, fetchActivity]);

  const [showNotifications, setShowNotifications] = useState(false);
  const [showShortcuts, setShowShortcuts] = useState(false);
  const [showCommandPalette, setShowCommandPalette] = useState(false);
  const [commandSearch, setCommandSearch] = useState('');

  const notifications = [
    ...(store.invoices.length > 0 ? [{
      id: '1',
      title: 'Invoices processed',
      description: `${store.invoices.length} invoice(s) in your account`,
      time: 'Just now',
      icon: FileText,
      color: 'text-teal-500',
    }] : []),
    {
      id: '2',
      title: 'Welcome to OmniParse',
      description: 'Upload your first invoice to get started',
      time: 'Getting started',
      icon: Sparkles,
      color: 'text-amber-500',
    },
    {
      id: '3',
      title: 'AI Chat available',
      description: store.user?.plan === 'free'
        ? 'Upgrade to Pro to unlock AI Chat'
        : 'Ask questions about your invoices',
      time: 'Feature',
      icon: Bot,
      color: 'text-amber-500',
    },
  ];

  // ── Settings State ──
  const [dateFormat, setDateFormat] = useState<'MM/DD/YYYY' | 'DD/MM/YYYY' | 'YYYY-MM-DD'>('MM/DD/YYYY');
  const [defaultCurrency, setDefaultCurrency] = useState('USD');
  const [compactView, setCompactView] = useState(false);
  const [settingsSaved, setSettingsSaved] = useState(false);

  const saveSettings = useCallback(() => {
    setSettingsSaved(true);
    toast.success('Settings saved successfully');
    setTimeout(() => setSettingsSaved(false), 2000);
  }, []);

  // ── Upload State ──
  const [selectedFiles, setSelectedFiles] = useState<File[]>([]);
  const [dragOver, setDragOver] = useState(false);
  const fileInputRef = useRef<HTMLInputElement>(null);

  const toggleSort = useCallback((field: string) => {
    if (sortField === field) {
      setSortDir(d => d === 'asc' ? 'desc' : 'asc');
    } else {
      setSortField(field);
      setSortDir('asc');
    }
  }, [sortField]);

  // ── Derived invoice data (before callbacks so they can reference it) ──
  const filteredInvoices = useMemo(() => {
    let result = store.invoices.filter((inv) => {
      if (invoiceSearch && !inv.vendor?.toLowerCase().includes(invoiceSearch.toLowerCase())) return false;
      if (invoiceFilter === 'done') return inv.status === 'done' && !inv.isDuplicate;
      if (invoiceFilter === 'review') return inv.status === 'review' || inv.isDuplicate;
      if (invoiceFilter === 'duplicates') return inv.isDuplicate;
      if (dateFrom && inv.invDate && inv.invDate < dateFrom) return false;
      if (dateTo && inv.invDate && inv.invDate > dateTo) return false;
      return true;
    });
    result.sort((a, b) => {
      let cmp = 0;
      const f = sortField;
      if (f === 'vendor') cmp = (a.vendor || '').localeCompare(b.vendor || '');
      else if (f === 'invNumber') cmp = (a.invNumber || '').localeCompare(b.invNumber || '');
      else if (f === 'invDate') cmp = (a.invDate || '').localeCompare(b.invDate || '');
      else if (f === 'amount') cmp = (a.amount ?? 0) - (b.amount ?? 0);
      else if (f === 'total') cmp = (a.total ?? 0) - (b.total ?? 0);
      else if (f === 'confidence') cmp = (a.confidence ?? 0) - (b.confidence ?? 0);
      else if (f === 'status') cmp = a.status.localeCompare(b.status);
      else cmp = new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime();
      return sortDir === 'asc' ? cmp : -cmp;
    });
    return result;
  }, [store.invoices, invoiceSearch, invoiceFilter, dateFrom, dateTo, sortField, sortDir]);

  // ── Chat scroll ref ──
  const chatEndRef = useRef<HTMLDivElement>(null);

  // ── Scroll refs for landing ──
  const featuresRef = useRef<HTMLElement>(null);
  const pricingRef = useRef<HTMLElement>(null);

  // ──────────────────────────────────────────────────────────────────────────────
  // API Callbacks
  // ──────────────────────────────────────────────────────────────────────────────

  const fetchMe = useCallback(async () => {
    const { setUser, setView, setLoading } = useAppStore.getState();
    try {
      const res = await fetch('/api/auth/me');
      if (res.ok) {
        const data = await res.json();
        setUser(data.user);
        setView('dashboard');
      } else {
        setUser(null);
        setLoading(false);
      }
    } catch {
      setUser(null);
      setLoading(false);
    }
  }, []);

  const fetchLogin = useCallback(async () => {
    setAuthError('');
    setAuthLoading(true);
    try {
      const res = await fetch('/api/auth/login', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ email: loginEmail, password: loginPassword }),
      });
      const data = await res.json();
      if (!res.ok) {
        setAuthError(data.error || 'Login failed');
        setAuthLoading(false);
        return;
      }
      const { setUser, setView } = useAppStore.getState();
      setUser(data.user);
      setView('dashboard');
      toast.success('Welcome back!');
    } catch {
      setAuthError('Network error. Please try again.');
    } finally {
      setAuthLoading(false);
    }
  }, [loginEmail, loginPassword]);

  const fetchSignup = useCallback(async () => {
    setAuthError('');
    if (signupPassword !== signupConfirm) {
      setAuthError('Passwords do not match');
      return;
    }
    setAuthLoading(true);
    try {
      const res = await fetch('/api/auth/signup', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ name: signupName, email: signupEmail, password: signupPassword }),
      });
      const data = await res.json();
      if (!res.ok) {
        setAuthError(data.error || 'Signup failed');
        setAuthLoading(false);
        return;
      }
      const { setUser, setView } = useAppStore.getState();
      setUser(data.user);
      setView('dashboard');
      toast.success('Account created successfully!');
    } catch {
      setAuthError('Network error. Please try again.');
    } finally {
      setAuthLoading(false);
    }
  }, [signupName, signupEmail, signupPassword, signupConfirm]);

  const fetchLogout = useCallback(() => {
    fetch('/api/auth/logout', { method: 'POST' }).catch(() => {});
    toast.success('Logged out');
    window.location.href = '/';
  }, []);

  const fetchInvoices = useCallback(async (filter?: string) => {
    const { setLoading, setInvoices } = useAppStore.getState();
    setLoading(true);
    try {
      const params = filter && filter !== 'all' ? `?filter=${filter}` : '';
      const res = await fetch(`/api/invoices${params}`);
      if (res.ok) {
        const data = await res.json();
        setInvoices(data.invoices);
      }
    } catch {
      toast.error('Failed to load invoices');
    } finally {
      setLoading(false);
    }
  }, []);

  const fetchUpload = useCallback(async () => {
    if (selectedFiles.length === 0) return;
    const { setUploadLoading, setUploadResults } = useAppStore.getState();
    setUploadLoading(true);
    try {
      const formData = new FormData();
      for (const file of selectedFiles) {
        formData.append('files', file);
      }
      const res = await fetch('/api/invoices/upload', {
        method: 'POST',
        body: formData,
      });
      const data = await res.json();
      if (!res.ok) {
        toast.error(data.error || 'Upload failed');
        setUploadLoading(false);
        return;
      }
      setUploadResults(data.invoices);
      setSelectedFiles([]);
      toast.success(`${data.invoices.length} invoice(s) processed successfully!`);
      fetchInvoices(invoiceFilter);
    } catch {
      toast.error('Upload failed. Please try again.');
    } finally {
      setUploadLoading(false);
    }
  }, [selectedFiles, invoiceFilter, fetchInvoices]);

  const fetchDeleteInvoice = useCallback(async (id: string) => {
    if (!window.confirm('Are you sure you want to delete this invoice? This action cannot be undone.')) return;
    try {
      const res = await fetch('/api/invoices', {
        method: 'DELETE',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ id }),
      });
      if (res.ok) {
        toast.success('Invoice deleted');
        setSelectedInvoices(prev => { const n = new Set(prev); n.delete(id); return n; });
        fetchInvoices(invoiceFilter);
        if (expandedInvoice === id) setExpandedInvoice(null);
      } else {
        const data = await res.json();
        toast.error(data.error || 'Failed to delete');
      }
    } catch {
      toast.error('Failed to delete invoice');
    }
  }, [invoiceFilter, expandedInvoice, fetchInvoices]);

  const fetchBatchDelete = useCallback(async () => {
    const ids = Array.from(selectedInvoices);
    if (ids.length === 0) return;
    if (!window.confirm(`Delete ${ids.length} invoice(s)? This action cannot be undone.`)) return;
    try {
      await Promise.all(ids.map(id =>
        fetch('/api/invoices', {
          method: 'DELETE',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ id }),
        })
      ));
      toast.success(`${ids.length} invoice(s) deleted`);
      setSelectedInvoices(new Set());
      fetchInvoices(invoiceFilter);
    } catch {
      toast.error('Failed to delete some invoices');
    }
  }, [selectedInvoices, invoiceFilter, fetchInvoices]);

  const toggleSelect = useCallback((id: string) => {
    setSelectedInvoices(prev => {
      const next = new Set(prev);
      if (next.has(id)) next.delete(id);
      else next.add(id);
      return next;
    });
  }, []);

  const toggleSelectAll = useCallback(() => {
    if (selectedInvoices.size === filteredInvoices.length) {
      setSelectedInvoices(new Set());
    } else {
      setSelectedInvoices(new Set(filteredInvoices.map(i => i.id)));
    }
  }, [selectedInvoices.size, filteredInvoices]);

  const fetchChat = useCallback(async () => {
    if (!chatInput.trim()) return;
    const { addChatMessage, chatHistory, setChatLoading } = useAppStore.getState();
    const userMsg: ChatMessage = { role: 'user', content: chatInput.trim() };
    addChatMessage(userMsg);
    const historyForApi = [...chatHistory, userMsg].map((m) => ({ role: m.role, content: m.content }));
    setChatInput('');
    setChatLoading(true);
    try {
      const res = await fetch('/api/chat', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ message: userMsg.content, history: historyForApi.slice(0, -1) }),
      });
      const data = await res.json();
      if (!res.ok) {
        addChatMessage({ role: 'assistant', content: data.error || 'Something went wrong.' });
      } else {
        addChatMessage({ role: 'assistant', content: data.reply });
      }
    } catch {
      addChatMessage({ role: 'assistant', content: 'Network error. Please try again.' });
    } finally {
      setChatLoading(false);
    }
  }, [chatInput]);

  const exportCsv = useCallback(() => {
    window.open('/api/invoices/export/csv', '_blank');
    toast.success('CSV download started');
  }, []);

  const exportJson = useCallback(() => {
    const { user } = useAppStore.getState();
    if (user?.plan === 'free') {
      toast.error('JSON export is available on Pro+ plans. Please upgrade.');
      return;
    }
    window.open('/api/invoices/export/json', '_blank');
    toast.success('JSON download started');
  }, []);

  const openEditModal = useCallback((inv: InvoiceRow) => {
    setEditingInvoice(inv);
    setEditForm({
      vendor: inv.vendor || '',
      invNumber: inv.invNumber || '',
      invDate: inv.invDate || '',
      dueDate: inv.dueDate || '',
      amount: String(inv.amount || ''),
      vatAmount: String(inv.vatAmount || ''),
      total: String(inv.total || ''),
      currency: inv.currency,
      status: inv.status === 'review' ? 'review' : 'done',
    });
  }, []);

  const saveEdit = useCallback(async () => {
    if (!editingInvoice) return;
    setEditSaving(true);
    try {
      const res = await fetch('/api/invoices/update', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ id: editingInvoice.id, ...editForm }),
      });
      if (res.ok) {
        toast.success('Invoice updated');
        setEditingInvoice(null);
        fetchInvoices(invoiceFilter);
      } else {
        const data = await res.json();
        toast.error(data.error || 'Update failed');
      }
    } catch {
      toast.error('Failed to update invoice');
    } finally {
      setEditSaving(false);
    }
  }, [editingInvoice, editForm, invoiceFilter, fetchInvoices]);

  // ── Effects ──

  useEffect(() => {
    fetchMe();
  }, [fetchMe]);

  useEffect(() => {
    if (store.view === 'dashboard' && store.activeDashTab === 'invoices') {
      fetchInvoices(invoiceFilter);
    }
  }, [store.view, store.activeDashTab, invoiceFilter, fetchInvoices]);

  useEffect(() => {
    chatEndRef.current?.scrollIntoView({ behavior: 'smooth' });
  }, [store.chatHistory, store.chatLoading]);

  // ── Drag-and-drop handlers ──

  const handleDragOver = useCallback((e: React.DragEvent) => {
    e.preventDefault();
    setDragOver(true);
  }, []);

  const handleDragLeave = useCallback((e: React.DragEvent) => {
    e.preventDefault();
    setDragOver(false);
  }, []);

  const handleDrop = useCallback((e: React.DragEvent) => {
    e.preventDefault();
    setDragOver(false);
    const files = Array.from(e.dataTransfer.files).filter(
      (f) => f.type === 'application/pdf' || f.type.startsWith('image/')
    );
    setSelectedFiles((prev) => [...prev, ...files]);
  }, []);

  const handleFileSelect = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
    if (e.target.files) {
      setSelectedFiles((prev) => [...prev, ...Array.from(e.target.files!)]);
    }
  }, []);

  const removeFile = useCallback((index: number) => {
    setSelectedFiles((prev) => prev.filter((_, i) => i !== index));
  }, []);

  // ── Scroll helpers ──

  const scrollToFeatures = useCallback(() => {
    featuresRef.current?.scrollIntoView({ behavior: 'smooth' });
    setMobileMenuOpen(false);
  }, []);

  const scrollToPricing = useCallback(() => {
    pricingRef.current?.scrollIntoView({ behavior: 'smooth' });
    setMobileMenuOpen(false);
  }, []);

  // ── Keyboard shortcut for search (decorative hint, but functional) ──
  useEffect(() => {
    const handler = (e: KeyboardEvent) => {
      if ((e.ctrlKey || e.metaKey) && e.key === 'k') {
        e.preventDefault();
        const { view } = useAppStore.getState();
        if (view === 'dashboard') {
          setShowCommandPalette(true);
        }
      }
      if ((e.ctrlKey || e.metaKey) && e.key === '/') {
        e.preventDefault();
        const { view } = useAppStore.getState();
        if (view === 'dashboard') {
          setShowShortcuts(true);
        }
      }
    };
    window.addEventListener('keydown', handler);
    return () => window.removeEventListener('keydown', handler);
  }, []);

  useEffect(() => {
    const handleScroll = () => {
      setShowScrollTop(window.scrollY > 400);
    };
    window.addEventListener('scroll', handleScroll, { passive: true });
    return () => window.removeEventListener('scroll', handleScroll);
  }, []);

  // ── Loading screen ──

  if (store.isLoading) {
    return (
      <div className="min-h-screen flex items-center justify-center">
        <Loader2 className="w-8 h-8 animate-spin text-amber-500" />
      </div>
    );
  }

  // ──────────────────────────────────────────────────────────────────────────────
  // LANDING VIEW
  // ──────────────────────────────────────────────────────────────────────────────

  if (store.view === 'landing') {
    return (
      <div className="min-h-screen flex flex-col noise-overlay">
        {/* ── Navbar ── */}
        <header className="fixed top-0 left-0 right-0 z-50 nav-blur">
          <nav className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 h-16 flex items-center justify-between">
            <div className="flex items-center gap-2">
              <div className="logo-glow w-8 h-8 rounded-lg bg-amber-500 flex items-center justify-center">
                <ScanLine className="w-5 h-5 text-zinc-900" />
              </div>
              <span className="text-lg font-bold text-foreground">OmniParse</span>
            </div>
            <div className="hidden md:flex items-center gap-8">
              <button onClick={scrollToFeatures} className="btn-ghost text-sm">
                Features
              </button>
              <button onClick={scrollToPricing} className="btn-ghost text-sm">
                Pricing
              </button>
            </div>
            <div className="hidden md:flex items-center gap-3">
              <button
                onClick={() => setTheme(theme === 'dark' ? 'light' : 'dark')}
                className="p-2 rounded-lg text-muted-foreground hover:text-foreground hover:bg-white/[0.04] transition-colors"
                aria-label={theme === 'dark' ? 'Switch to light mode' : 'Switch to dark mode'}
              >
                {theme === 'dark' ? <Sun className="w-4 h-4" /> : <Moon className="w-4 h-4" />}
              </button>
              <button
                onClick={() => { setAuthMode('login'); store.setView('auth'); }}
                className="btn-ghost text-sm"
              >
                Log in
              </button>
              <button
                onClick={() => { setAuthMode('signup'); store.setView('auth'); }}
                className="btn-primary text-sm"
              >
                Get Started
              </button>
            </div>
            <button
              className="md:hidden text-muted-foreground hover:text-foreground"
              onClick={() => setMobileMenuOpen(!mobileMenuOpen)}
              aria-label="Toggle navigation menu"
            >
              {mobileMenuOpen ? <X className="w-6 h-6" /> : <Menu className="w-6 h-6" />}
            </button>
          </nav>
          {mobileMenuOpen && (
            <div className="md:hidden border-t border-white/[0.06] bg-background/95 backdrop-blur-md fade-in mobile-nav-slide">
              <div className="px-4 py-4 space-y-3">
                <button onClick={scrollToFeatures} className="block w-full text-left text-sm text-muted-foreground hover:text-foreground py-2">
                  Features
                </button>
                <button onClick={scrollToPricing} className="block w-full text-left text-sm text-muted-foreground hover:text-foreground py-2">
                  Pricing
                </button>
                <div className="pt-2 border-t border-white/[0.06] space-y-2">
                  <button
                    onClick={() => { setTheme(theme === 'dark' ? 'light' : 'dark'); }}
                    className="flex items-center gap-3 w-full text-sm text-muted-foreground hover:text-foreground py-2"
                  >
                    {theme === 'dark' ? <Sun className="w-4 h-4" /> : <Moon className="w-4 h-4" />}
                    {theme === 'dark' ? 'Light mode' : 'Dark mode'}
                  </button>
                  <button
                    onClick={() => { setAuthMode('login'); store.setView('auth'); setMobileMenuOpen(false); }}
                    className="block w-full text-sm text-muted-foreground hover:text-foreground py-2"
                  >
                    Log in
                  </button>
                  <button
                    onClick={() => { setAuthMode('signup'); store.setView('auth'); setMobileMenuOpen(false); }}
                    className="btn-primary text-sm block w-full text-center"
                  >
                    Get Started
                  </button>
                </div>
              </div>
            </div>
          )}
        </header>

        <main className="flex-1">
          {/* ── Hero Section ── */}
          <section className="relative min-h-[90vh] flex items-center justify-center grid-bg hero-grid-enhanced overflow-hidden pt-16">
            <div className="hero-orb" />
            <div className="hero-orb-2" />
            <div className="relative z-10 max-w-4xl mx-auto px-4 text-center">
              <div className="inline-flex items-center gap-2 px-4 py-1.5 rounded-full border border-white/[0.08] bg-white/[0.03] text-sm text-muted-foreground mb-8 fade-in float-animation">
                <Sparkles className="w-4 h-4 text-amber-500" />
                Powered by advanced AI extraction
              </div>
              <h1 className="text-4xl sm:text-5xl md:text-6xl lg:text-7xl font-bold tracking-tight mb-6 fade-in">
                Invoice Processing,{' '}
                <span className="gradient-text">Reimagined</span>
              </h1>
              <p className="text-lg sm:text-xl text-muted-foreground max-w-2xl mx-auto mb-10 fade-in">
                Upload any invoice and let AI extract vendor details, amounts, dates, and line items in seconds. Export structured data to CSV, JSON, or connect via API.
              </p>
              <div className="flex flex-col sm:flex-row items-center justify-center gap-4 fade-in">
                <button
                  onClick={() => { setAuthMode('signup'); store.setView('auth'); }}
                  className="btn-shine pulse-glow flex items-center gap-2 px-8 py-3.5 rounded-xl bg-amber-500 text-zinc-900 font-semibold text-base hover:bg-amber-400 transition-all hover:shadow-lg hover:shadow-amber-500/20"
                >
                  Start Free Trial
                  <ArrowRight className="w-5 h-5" />
                </button>
                <button
                  onClick={scrollToFeatures}
                  className="flex items-center gap-2 px-8 py-3.5 rounded-xl border border-white/[0.1] text-foreground font-medium text-base hover:bg-white/[0.04] transition-all"
                >
                  See How It Works
                  <ChevronDown className="w-5 h-5" />
                </button>
              </div>
            </div>
            <div className="hidden lg:block absolute top-32 right-16 float-animation-delayed">
              <div className="glass-card p-3 flex items-center gap-2 text-xs text-muted-foreground">
                <Shield className="w-4 h-4 text-teal-500" />
                <span>SOC 2 Compliant</span>
              </div>
            </div>
          </section>

          {/* ── Stats Bar ── */}
          <section className="border-y border-white/[0.06] bg-white/[0.01]">
            <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8 grid grid-cols-1 sm:grid-cols-3 gap-8">
              <div className="stat-animate text-center">
                <div className="text-3xl sm:text-4xl font-bold text-foreground">10K+</div>
                <div className="text-sm text-muted-foreground mt-1">Invoices Processed</div>
              </div>
              <div className="stat-animate text-center">
                <div className="text-3xl sm:text-4xl font-bold text-foreground">99.2%</div>
                <div className="text-sm text-muted-foreground mt-1">Accuracy Rate</div>
              </div>
              <div className="stat-animate text-center">
                <div className="text-3xl sm:text-4xl font-bold text-foreground">500+</div>
                <div className="text-sm text-muted-foreground mt-1">Companies Trust Us</div>
              </div>
            </div>
          </section>

          <hr className="section-glow-divider my-0" />

          {/* ── How It Works ── */}
          <section className="py-20 sm:py-28">
            <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
              <div className="text-center mb-16">
                <h2 className="text-3xl sm:text-4xl font-bold mb-4">How It Works</h2>
                <p className="text-muted-foreground text-lg max-w-xl mx-auto">Three simple steps to transform your invoices into structured data</p>
              </div>
              <div className="relative grid grid-cols-1 md:grid-cols-3 gap-8">
                <article className="step-connector text-center section-reveal">
                  <div className="w-14 h-14 rounded-full bg-amber-500/10 border border-amber-500/20 flex items-center justify-center mx-auto mb-5">
                    <span className="text-xl font-bold text-amber-500">1</span>
                  </div>
                  <h3 className="text-xl font-semibold mb-3">Upload</h3>
                  <p className="text-muted-foreground text-sm leading-relaxed">
                    Drag and drop your invoice PDFs or images. We support batch uploads of multiple files at once.
                  </p>
                </article>
                <article className="step-connector text-center section-reveal" style={{ animationDelay: '0.15s' }}>
                  <div className="w-14 h-14 rounded-full bg-teal-500/10 border border-teal-500/20 flex items-center justify-center mx-auto mb-5">
                    <span className="text-xl font-bold text-teal-500">2</span>
                  </div>
                  <h3 className="text-xl font-semibold mb-3">Extract</h3>
                  <p className="text-muted-foreground text-sm leading-relaxed">
                    Our AI automatically extracts vendor details, line items, amounts, dates, and detects duplicates.
                  </p>
                </article>
                <article className="step-connector text-center section-reveal" style={{ animationDelay: '0.3s' }}>
                  <div className="w-14 h-14 rounded-full bg-amber-500/10 border border-amber-500/20 flex items-center justify-center mx-auto mb-5">
                    <span className="text-xl font-bold text-amber-500">3</span>
                  </div>
                  <h3 className="text-xl font-semibold mb-3">Export</h3>
                  <p className="text-muted-foreground text-sm leading-relaxed">
                    Download your data as CSV or JSON, or integrate directly with your systems using our REST API.
                  </p>
                </article>
              </div>
            </div>
          </section>

          <hr className="section-glow-divider my-0" />

          {/* ── Features Section ── */}
          <section ref={featuresRef} className="py-20 sm:py-28 bg-white/[0.01]">
            <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
              <div className="text-center mb-16">
                <h2 className="text-3xl sm:text-4xl font-bold mb-4">Everything You Need</h2>
                <p className="text-muted-foreground text-lg max-w-xl mx-auto">Powerful features designed to streamline your invoice processing workflow</p>
              </div>
              <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-6">
                <article className="feature-card-gradient feature-amber p-6 card-enter">
                  <div className="feature-icon w-11 h-11 rounded-lg flex items-center justify-center mb-4">
                    <Zap className="w-5 h-5" />
                  </div>
                  <h3 className="text-base font-semibold mb-2">Instant Extraction</h3>
                  <p className="text-sm text-muted-foreground leading-relaxed">
                    Extract all invoice fields in under 3 seconds per document with near-perfect accuracy.
                  </p>
                </article>
                <article className="feature-card-gradient feature-teal p-6 card-enter">
                  <div className="feature-icon w-11 h-11 rounded-lg flex items-center justify-center mb-4">
                    <Shield className="w-5 h-5" />
                  </div>
                  <h3 className="text-base font-semibold mb-2">Duplicate Detection</h3>
                  <p className="text-sm text-muted-foreground leading-relaxed">
                    Automatically flags potential duplicate invoices based on vendor and amount matching.
                  </p>
                </article>
                <article className="feature-card-gradient feature-red p-6 card-enter">
                  <div className="feature-icon w-11 h-11 rounded-lg flex items-center justify-center mb-4">
                    <Bot className="w-5 h-5" />
                  </div>
                  <h3 className="text-base font-semibold mb-2">AI Chat Assistant</h3>
                  <p className="text-sm text-muted-foreground leading-relaxed">
                    Ask questions about your invoices, get spending insights, and analyze vendor relationships.
                  </p>
                </article>
                <article className="feature-card-gradient feature-green p-6 card-enter">
                  <div className="feature-icon w-11 h-11 rounded-lg flex items-center justify-center mb-4">
                    <Globe className="w-5 h-5" />
                  </div>
                  <h3 className="text-base font-semibold mb-2">Multi-Currency</h3>
                  <p className="text-sm text-muted-foreground leading-relaxed">
                    Automatically detects and processes invoices in USD, EUR, GBP, CAD, AUD, and more.
                  </p>
                </article>
                <article className="feature-card-gradient feature-sky p-6 card-enter">
                  <div className="feature-icon w-11 h-11 rounded-lg flex items-center justify-center mb-4">
                    <Layers className="w-5 h-5" />
                  </div>
                  <h3 className="text-base font-semibold mb-2">Bulk Processing</h3>
                  <p className="text-sm text-muted-foreground leading-relaxed">
                    Upload dozens of invoices at once. Our system processes them in parallel for maximum speed.
                  </p>
                </article>
                <article className="feature-card-gradient feature-rose p-6 card-enter">
                  <div className="feature-icon w-11 h-11 rounded-lg flex items-center justify-center mb-4">
                    <Lock className="w-5 h-5" />
                  </div>
                  <h3 className="text-base font-semibold mb-2">Enterprise Security</h3>
                  <p className="text-sm text-muted-foreground leading-relaxed">
                    Your data is encrypted at rest and in transit. SOC 2 compliant infrastructure.
                  </p>
                </article>
              </div>
            </div>
          </section>

          <hr className="section-glow-divider my-0" />

          {/* ── Testimonials ── */}
          <section className="py-20 sm:py-28">
            <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
              <div className="text-center mb-16">
                <h2 className="text-3xl sm:text-4xl font-bold mb-4">Trusted by Teams Worldwide</h2>
                <p className="text-muted-foreground text-lg max-w-xl mx-auto">See what our customers have to say</p>
              </div>
              <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
                <blockquote className="testimonial-card p-6 card-enter" style={{ animationDelay: '0ms' }}>
                  <Quote className="w-8 h-8 text-amber-500/40 mb-4" />
                  <p className="text-sm text-muted-foreground leading-relaxed mb-6">
                    &ldquo;OmniParse reduced our invoice processing time from hours to minutes. The accuracy is outstanding and the duplicate detection has saved us from overpaying vendors multiple times.&rdquo;
                  </p>
                  <footer className="flex items-center gap-3">
                    <div className="w-10 h-10 rounded-full bg-amber-500/10 flex items-center justify-center">
                      <span className="text-sm font-semibold text-amber-500">SM</span>
                    </div>
                    <div>
                      <div className="text-sm font-medium">Sarah Mitchell</div>
                      <div className="text-xs text-muted-foreground">CFO, TechVentures Inc.</div>
                    </div>
                  </footer>
                </blockquote>
                <blockquote className="testimonial-card p-6 card-enter" style={{ animationDelay: '100ms' }}>
                  <Quote className="w-8 h-8 text-teal-500/40 mb-4" />
                  <p className="text-sm text-muted-foreground leading-relaxed mb-6">
                    &ldquo;We process over 500 invoices per month. The API integration was seamless and the structured JSON output fits perfectly into our ERP system. A game changer for our accounting team.&rdquo;
                  </p>
                  <footer className="flex items-center gap-3">
                    <div className="w-10 h-10 rounded-full bg-teal-500/10 flex items-center justify-center">
                      <span className="text-sm font-semibold text-teal-500">JK</span>
                    </div>
                    <div>
                      <div className="text-sm font-medium">James Kim</div>
                      <div className="text-xs text-muted-foreground">CTO, DataFlow Systems</div>
                    </div>
                  </footer>
                </blockquote>
                <blockquote className="testimonial-card p-6 card-enter" style={{ animationDelay: '200ms' }}>
                  <Quote className="w-8 h-8 text-amber-500/40 mb-4" />
                  <p className="text-sm text-muted-foreground leading-relaxed mb-6">
                    &ldquo;The AI chat feature is incredible. I can ask questions like &apos;Which vendor had the highest spending this quarter?&apos; and get instant answers. It&apos;s like having a financial analyst on demand.&rdquo;
                  </p>
                  <footer className="flex items-center gap-3">
                    <div className="w-10 h-10 rounded-full bg-amber-500/10 flex items-center justify-center">
                      <span className="text-sm font-semibold text-amber-500">RP</span>
                    </div>
                    <div>
                      <div className="text-sm font-medium">Rachel Patel</div>
                      <div className="text-xs text-muted-foreground">VP Finance, Meridian Group</div>
                    </div>
                  </footer>
                </blockquote>
              </div>
            </div>
          </section>

          <hr className="section-glow-divider my-0" />

          {/* ── FAQ ── */}
          <section className="py-20 sm:py-28 bg-white/[0.01]">
            <div className="max-w-3xl mx-auto px-4 sm:px-6 lg:px-8">
              <div className="text-center mb-16">
                <h2 className="text-3xl sm:text-4xl font-bold mb-4">Frequently Asked Questions</h2>
              </div>
              <div className="space-y-3">
                <details className="glass-card group">
                  <summary className="flex items-center justify-between cursor-pointer p-5 text-sm font-medium">
                    What file formats are supported?
                    <ChevronDown className="w-4 h-4 text-muted-foreground group-open:rotate-180 transition-transform" />
                  </summary>
                  <div className="px-5 pb-5 text-sm text-muted-foreground leading-relaxed">
                    We support PDF files and common image formats including PNG, JPG, and JPEG. You can upload multiple files at once for batch processing.
                  </div>
                </details>
                <details className="glass-card group">
                  <summary className="flex items-center justify-between cursor-pointer p-5 text-sm font-medium">
                    How accurate is the extraction?
                    <ChevronDown className="w-4 h-4 text-muted-foreground group-open:rotate-180 transition-transform" />
                  </summary>
                  <div className="px-5 pb-5 text-sm text-muted-foreground leading-relaxed">
                    Our AI achieves 99.2% accuracy on standard invoices. Each extraction includes a confidence score so you can review lower-confidence results. The system also flags potential duplicates automatically.
                  </div>
                </details>
                <details className="glass-card group">
                  <summary className="flex items-center justify-between cursor-pointer p-5 text-sm font-medium">
                    Is my data secure?
                    <ChevronDown className="w-4 h-4 text-muted-foreground group-open:rotate-180 transition-transform" />
                  </summary>
                  <div className="px-5 pb-5 text-sm text-muted-foreground leading-relaxed">
                    Absolutely. All data is encrypted at rest and in transit. We use SOC 2 compliant infrastructure and your documents are never shared with third parties. You can delete your data at any time.
                  </div>
                </details>
                <details className="glass-card group">
                  <summary className="flex items-center justify-between cursor-pointer p-5 text-sm font-medium">
                    Can I integrate OmniParse with my existing tools?
                    <ChevronDown className="w-4 h-4 text-muted-foreground group-open:rotate-180 transition-transform" />
                  </summary>
                  <div className="px-5 pb-5 text-sm text-muted-foreground leading-relaxed">
                    Yes! We provide a REST API with your unique API key. You can upload invoices, retrieve processed data, and trigger exports programmatically. Full API documentation is available in your dashboard.
                  </div>
                </details>
                <details className="glass-card group">
                  <summary className="flex items-center justify-between cursor-pointer p-5 text-sm font-medium">
                    What happens when I reach my plan limit?
                    <ChevronDown className="w-4 h-4 text-muted-foreground group-open:rotate-180 transition-transform" />
                  </summary>
                  <div className="px-5 pb-5 text-sm text-muted-foreground leading-relaxed">
                    You will receive a notification when you are approaching your monthly limit. Once reached, you can upgrade your plan or wait for the next billing cycle. Enterprise plans have unlimited processing.
                  </div>
                </details>
              </div>
            </div>
          </section>

          <hr className="section-glow-divider my-0" />

          {/* ── Pricing Section ── */}
          <section ref={pricingRef} className="py-20 sm:py-28">
            <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
              <div className="text-center mb-16">
                <h2 className="text-3xl sm:text-4xl font-bold mb-4">Simple, Transparent Pricing</h2>
                <p className="text-muted-foreground text-lg max-w-xl mx-auto">Choose the plan that fits your needs. Upgrade or downgrade anytime.</p>
              </div>
              <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-6">
                {[
                  { name: 'Free', price: 0, limit: '20 invoices/mo', features: ['Basic extraction', 'CSV export', 'Email support', '1 user'] },
                  { name: 'Pro', price: 129, limit: '2,000 invoices/mo', features: ['Advanced extraction', 'CSV & JSON export', 'AI Chat assistant', 'API access', 'Priority support', '5 users'], highlight: true },
                  { name: 'Business', price: 29, limit: '200 invoices/mo', features: ['Standard extraction', 'CSV & JSON export', 'API access', 'Email & chat support', '3 users'] },
                  { name: 'Enterprise', price: 499, limit: 'Unlimited', features: ['Custom AI models', 'All export formats', 'Dedicated AI Chat', 'Full API access', 'Dedicated support', 'Unlimited users', 'SLA guarantee'] },
                ].map((plan) => (
                  <article
                    key={plan.name}
                    className={`glass-card p-6 flex flex-col relative ${plan.highlight ? 'pricing-highlight amber-glow' : ''}`}
                  >
                    {plan.highlight && <div className="pricing-ribbon">Most Popular</div>}
                    <div className="mb-5">
                      <h3 className="text-lg font-semibold mb-1">{plan.name}</h3>
                      <div className="text-3xl font-bold text-foreground">
                        ${plan.price}<span className="text-sm font-normal text-muted-foreground">/mo</span>
                      </div>
                      <div className="text-sm text-muted-foreground mt-1">{plan.limit}</div>
                    </div>
                    <ul className="space-y-3 mb-8 flex-1">
                      {plan.features.map((f) => (
                        <li key={f} className="flex items-center gap-2 text-sm text-muted-foreground">
                          <Check className="w-4 h-4 text-teal-500 shrink-0" />
                          {f}
                        </li>
                      ))}
                    </ul>
                    <button
                      onClick={() => {
                        if (plan.name === 'Free') {
                          setAuthMode('signup');
                          store.setView('auth');
                        } else {
                          toast.info('Coming soon! This plan will be available shortly.');
                        }
                      }}
                      className={`btn-shine w-full py-2.5 rounded-lg text-sm font-medium transition-colors ${
                        plan.highlight
                          ? 'bg-amber-500 text-zinc-900 hover:bg-amber-400'
                          : 'border border-white/[0.1] text-foreground hover:bg-white/[0.04]'
                      }`}
                    >
                      {plan.name === 'Free' ? 'Get Started' : 'Coming Soon'}
                    </button>
                  </article>
                ))}
              </div>
            </div>
          </section>
        </main>

        {/* ── Footer ── */}
        <footer className="border-t border-white/[0.06] bg-white/[0.01] mt-auto">
          <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-12 grid grid-cols-2 md:grid-cols-4 gap-8">
            <div>
              <h4 className="text-sm font-semibold mb-4">Product</h4>
              <ul className="space-y-2 text-sm">
                <li><span className="footer-link-underline">Features</span></li>
                <li><span className="footer-link-underline">Pricing</span></li>
                <li><span className="footer-link-underline">API Docs</span></li>
                <li><span className="footer-link-underline">Changelog</span></li>
              </ul>
            </div>
            <div>
              <h4 className="text-sm font-semibold mb-4">Company</h4>
              <ul className="space-y-2 text-sm">
                <li><span className="footer-link-underline">About</span></li>
                <li><span className="footer-link-underline">Blog</span></li>
                <li><span className="footer-link-underline">Careers</span></li>
                <li><span className="footer-link-underline">Contact</span></li>
              </ul>
            </div>
            <div>
              <h4 className="text-sm font-semibold mb-4">Resources</h4>
              <ul className="space-y-2 text-sm">
                <li><span className="footer-link-underline">Documentation</span></li>
                <li><span className="footer-link-underline">Help Center</span></li>
                <li><span className="footer-link-underline">Status Page</span></li>
              </ul>
            </div>
            <div>
              <h4 className="text-sm font-semibold mb-4">Legal</h4>
              <ul className="space-y-2 text-sm">
                <li><span className="footer-link-underline">Privacy Policy</span></li>
                <li><span className="footer-link-underline">Terms of Service</span></li>
                <li><span className="footer-link-underline">Security</span></li>
              </ul>
            </div>
          </div>
          <div className="border-t border-white/[0.06]">
            <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-6 flex flex-col sm:flex-row items-center justify-between gap-4">
              <div className="flex items-center gap-2">
                <div className="w-6 h-6 rounded-md bg-amber-500 flex items-center justify-center">
                  <ScanLine className="w-3.5 h-3.5 text-zinc-900" />
                </div>
                <span className="text-sm text-muted-foreground">OmniParse AI</span>
              </div>
              <p className="text-xs text-muted-foreground">
                &copy; {new Date().getFullYear()} OmniParse AI. All rights reserved.
              </p>
            </div>
          </div>
        </footer>

        {/* ── Scroll to Top ── */}
        <button
          onClick={() => window.scrollTo({ top: 0, behavior: 'smooth' })}
          className={`scroll-top-btn ${showScrollTop ? 'visible' : ''}`}
          aria-label="Scroll to top"
        >
          <ChevronUp className="w-5 h-5" />
        </button>

        {/* ── Download HF Space (preview only) ── */}
        <a
          href="/api/hf-download"
          className="fixed bottom-20 right-5 z-50 flex items-center gap-2 px-4 py-2.5 rounded-xl bg-amber-500 hover:bg-amber-400 text-black font-medium text-sm shadow-lg shadow-amber-500/25 hover:shadow-amber-400/30 transition-all duration-200 hover:scale-[1.03] active:scale-[0.98]"
        >
          <Download className="w-4 h-4" />
          Download HF Space (.zip)
        </a>
      </div>
    );
  }

  // ──────────────────────────────────────────────────────────────────────────────
  // AUTH VIEW
  // ──────────────────────────────────────────────────────────────────────────────

  if (store.view === 'auth') {
    const pwStrength = getPasswordStrength(authMode === 'signup' ? signupPassword : '');
    return (
      <div className="min-h-screen flex flex-col items-center justify-center px-4 py-12 noise-overlay">
        <div className="w-full max-w-md">
          <button
            onClick={() => store.setView('landing')}
            className="flex items-center gap-2 text-sm text-muted-foreground hover:text-foreground mb-8 transition-colors"
          >
            <ArrowLeft className="w-4 h-4" />
            Back to home
          </button>
          <div className="glass-card p-6 sm:p-8 amber-glow view-enter">
            <div className="text-center mb-8">
              <div className="w-12 h-12 rounded-xl bg-amber-500 flex items-center justify-center mx-auto mb-4">
                <ScanLine className="w-7 h-7 text-zinc-900" />
              </div>
              <h1 className="text-2xl font-bold">
                {authMode === 'login' ? 'Welcome back' : 'Create your account'}
              </h1>
              <p className="text-sm text-muted-foreground mt-1">
                {authMode === 'login' ? 'Sign in to your OmniParse account' : 'Get started with OmniParse for free'}
              </p>
            </div>

            {/* Tab Toggle */}
            <div className="flex border border-white/[0.08] rounded-lg p-1 mb-6">
              <button
                onClick={() => { setAuthMode('login'); setAuthError(''); }}
                className={`flex-1 py-2 text-sm font-medium rounded-md transition-colors ${
                  authMode === 'login' ? 'bg-amber-500 text-zinc-900' : 'text-muted-foreground hover:text-foreground'
                }`}
              >
                Log in
              </button>
              <button
                onClick={() => { setAuthMode('signup'); setAuthError(''); }}
                className={`flex-1 py-2 text-sm font-medium rounded-md transition-colors ${
                  authMode === 'signup' ? 'bg-amber-500 text-zinc-900' : 'text-muted-foreground hover:text-foreground'
                }`}
              >
                Sign up
              </button>
            </div>

            {/* Error Display */}
            {authError && (
              <div className="flex items-center gap-2 p-3 mb-6 rounded-lg bg-red-500/10 border border-red-500/20 text-sm text-red-400 fade-in">
                <AlertCircle className="w-4 h-4 shrink-0" />
                {authError}
              </div>
            )}

            {authMode === 'login' ? (
              <form
                onSubmit={(e) => { e.preventDefault(); fetchLogin(); }}
                className="space-y-4"
              >
                <div>
                  <label className="input-label" htmlFor="login-email">
                    Email
                  </label>
                  <div className="relative">
                    <Mail className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
                    <input
                      id="login-email"
                      type="email"
                      value={loginEmail}
                      onChange={(e) => setLoginEmail(e.target.value)}
                      required
                      placeholder="you@company.com"
                      className="input-field input-field-glow pl-10"
                    />
                  </div>
                </div>
                <div>
                  <label className="input-label" htmlFor="login-password">
                    Password
                  </label>
                  <div className="relative">
                    <Lock className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
                    <input
                      id="login-password"
                      type="password"
                      value={loginPassword}
                      onChange={(e) => setLoginPassword(e.target.value)}
                      required
                      placeholder="Enter your password"
                      className="input-field input-field-glow pl-10"
                    />
                  </div>
                </div>
                <button
                  type="submit"
                  disabled={authLoading}
                  className="btn-primary text-sm w-full flex items-center justify-center gap-2 disabled:opacity-50"
                >
                  {authLoading && <Loader2 className="w-4 h-4 animate-spin" />}
                  Sign In
                </button>
                <div className="text-center">
                  <button
                    type="button"
                    onClick={() => toast.info('Password reset feature coming soon')}
                    className="text-xs text-muted-foreground hover:text-amber-500 transition-colors"
                  >
                    Forgot your password?
                  </button>
                </div>
                <div className="text-center">
                  <p className="text-xs text-muted-foreground mt-4">
                    Demo credentials: <span className="text-amber-500">demo@omniparse.ai</span> / <span className="text-amber-500">demo1234</span>
                  </p>
                </div>
              </form>
            ) : (
              <form
                onSubmit={(e) => { e.preventDefault(); fetchSignup(); }}
                className="space-y-4"
              >
                <div>
                  <label className="input-label" htmlFor="signup-name">
                    Name
                  </label>
                  <div className="relative">
                    <User className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
                    <input
                      id="signup-name"
                      type="text"
                      value={signupName}
                      onChange={(e) => setSignupName(e.target.value)}
                      required
                      placeholder="Your full name"
                      className="input-field input-field-glow pl-10"
                    />
                  </div>
                </div>
                <div>
                  <label className="input-label" htmlFor="signup-email">
                    Email
                  </label>
                  <div className="relative">
                    <Mail className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
                    <input
                      id="signup-email"
                      type="email"
                      value={signupEmail}
                      onChange={(e) => setSignupEmail(e.target.value)}
                      required
                      placeholder="you@company.com"
                      className="input-field input-field-glow pl-10"
                    />
                  </div>
                </div>
                <div>
                  <label className="input-label" htmlFor="signup-password">
                    Password
                  </label>
                  <div className="relative">
                    <Lock className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
                    <input
                      id="signup-password"
                      type="password"
                      value={signupPassword}
                      onChange={(e) => setSignupPassword(e.target.value)}
                      required
                      minLength={6}
                      placeholder="At least 6 characters"
                      className="input-field input-field-glow pl-10"
                    />
                  </div>
                  {signupPassword && (
                    <div className="mt-2">
                      <div className="h-1.5 w-full bg-zinc-800 rounded-full overflow-hidden">
                        <div className={`h-full ${pwStrength.color} ${pwStrength.width} rounded-full transition-all duration-300`} />
                      </div>
                      <p className="text-xs text-muted-foreground mt-1">{pwStrength.label}</p>
                    </div>
                  )}
                </div>
                <div>
                  <label className="input-label" htmlFor="signup-confirm">
                    Confirm Password
                  </label>
                  <div className="relative">
                    <Lock className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
                    <input
                      id="signup-confirm"
                      type="password"
                      value={signupConfirm}
                      onChange={(e) => setSignupConfirm(e.target.value)}
                      required
                      placeholder="Confirm your password"
                      className="input-field input-field-glow pl-10"
                    />
                  </div>
                </div>
                <button
                  type="submit"
                  disabled={authLoading}
                  className="btn-primary text-sm w-full flex items-center justify-center gap-2 disabled:opacity-50"
                >
                  {authLoading && <Loader2 className="w-4 h-4 animate-spin" />}
                  Create Account
                </button>
              </form>
            )}
          </div>
        </div>
      </div>
    );
  }

  // ──────────────────────────────────────────────────────────────────────────────
  // DASHBOARD VIEW
  // ──────────────────────────────────────────────────────────────────────────────

  if (store.view === 'dashboard' && store.user) {
    const planLimit = PLAN_LIMITS[store.user.plan] ?? PLAN_LIMITS.free;
    const planLabel = PLAN_LABELS[store.user.plan] ?? store.user.plan;
    const invoiceCount = store.invoices.length;
    const totalAmount = store.invoices.reduce((s, i) => s + (i.total ?? 0), 0);
    const dupCount = store.invoices.filter((i) => i.isDuplicate).length;
    const avgConfidence = store.invoices.length > 0
      ? store.invoices.reduce((s, i) => s + (i.confidence ?? 0), 0) / store.invoices.length
      : 0;
    const usagePercent = planLimit === Infinity ? 0 : Math.min((invoiceCount / planLimit) * 100, 100);

    return (
      <div className="min-h-screen flex flex-col noise-overlay">
        {/* ── Dashboard Header ── */}
        <header className="sticky top-0 z-50 nav-blur">
          <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 h-16 flex items-center justify-between">
            <div className="flex items-center gap-3">
              <div className="logo-glow w-8 h-8 rounded-lg bg-amber-500 flex items-center justify-center">
                <ScanLine className="w-5 h-5 text-zinc-900" />
              </div>
              <span className="font-bold text-foreground hidden sm:inline">OmniParse</span>
              <span className={`${store.user.plan === 'free' || store.user.plan === 'Free' ? 'badge-muted' : 'badge-amber'}`}>
                {planLabel}
              </span>
            </div>
            <div className="flex items-center gap-3">
              <button
                onClick={() => setTheme(theme === 'dark' ? 'light' : 'dark')}
                className="p-2 rounded-lg text-muted-foreground hover:text-foreground hover:bg-white/[0.04] transition-colors"
                aria-label={theme === 'dark' ? 'Switch to light mode' : 'Switch to dark mode'}
              >
                {theme === 'dark' ? <Sun className="w-4 h-4" /> : <Moon className="w-4 h-4" />}
              </button>
              <button
                onClick={() => { store.setActiveDashTab('upload'); }}
                className="hidden sm:flex items-center gap-1.5 text-xs font-medium px-3 py-1.5 rounded-lg bg-amber-500/10 text-amber-500 hover:bg-amber-500/20 transition-colors"
              >
                <Upload className="w-3.5 h-3.5" />
                Upload
              </button>
              <button
                onClick={() => setShowCommandPalette(true)}
                className="hidden sm:flex items-center gap-1.5 text-xs font-medium px-3 py-1.5 rounded-lg bg-white/[0.04] text-muted-foreground hover:text-foreground hover:bg-white/[0.06] border border-white/[0.06] transition-colors"
              >
                <Search className="w-3.5 h-3.5" />
                Search...
                <kbd className="kbd text-[10px] ml-1">Ctrl+K</kbd>
              </button>
              <button
                onClick={exportCsv}
                className="hidden sm:flex items-center gap-1.5 text-xs font-medium px-3 py-1.5 rounded-lg bg-teal-500/10 text-teal-500 hover:bg-teal-500/20 transition-colors"
              >
                <FileDown className="w-3.5 h-3.5" />
                Export CSV
              </button>
              <button
                onClick={() => { window.open('/api/invoices/export/xlsx', '_blank'); toast.success('Excel download started'); }}
                className="hidden sm:flex items-center gap-1.5 text-xs font-medium px-3 py-1.5 rounded-lg bg-amber-500/10 text-amber-500 hover:bg-amber-500/20 transition-colors"
              >
                <FileJson className="w-3.5 h-3.5" />
                Export XLSX
              </button>
              <div className="relative">
                <button
                  onClick={() => setShowNotifications(!showNotifications)}
                  className="p-2 rounded-lg text-muted-foreground hover:text-foreground hover:bg-white/[0.04] transition-colors"
                  aria-label="Notifications"
                >
                  <Bell className="w-4 h-4" />
                  {store.invoices.length > 0 && (
                    <span className="notification-badge" />
                  )}
                </button>
                {showNotifications && (
                  <>
                    <div className="fixed inset-0 z-40" onClick={() => setShowNotifications(false)} />
                    <div className="notification-dropdown z-50">
                      <div className="px-4 py-3 border-b border-white/[0.06]">
                        <h3 className="text-sm font-semibold">Notifications</h3>
                      </div>
                      <div className="max-h-80 overflow-y-auto">
                        {notifications.map((n) => {
                          const NIcon = n.icon;
                          return (
                            <div key={n.id} className="notification-item flex items-start gap-3">
                              <div className={`mt-0.5 ${n.color}`}>
                                <NIcon className="w-4 h-4" />
                              </div>
                              <div className="min-w-0 flex-1">
                                <div className="text-sm font-medium">{n.title}</div>
                                <div className="text-xs text-muted-foreground mt-0.5">{n.description}</div>
                              </div>
                            </div>
                          );
                        })}
                      </div>
                    </div>
                  </>
                )}
              </div>
              <div className="flex items-center gap-2 ml-2">
                <div className="w-8 h-8 rounded-full bg-white/[0.06] flex items-center justify-center text-sm font-medium text-amber-500">
                  {store.user.name.charAt(0).toUpperCase()}
                </div>
                <span className="text-sm font-medium hidden sm:inline">{store.user.name}</span>
              </div>
              <button
                onClick={fetchLogout}
                className="p-2 rounded-lg text-muted-foreground hover:text-foreground hover:bg-white/[0.04] transition-colors"
                aria-label="Log out"
                title="Log out"
              >
                <LogOut className="w-4 h-4" />
              </button>
              <button
                className="md:hidden p-2 rounded-lg text-muted-foreground hover:text-foreground"
                onClick={() => setDashMobileMenu(!dashMobileMenu)}
                aria-label="Toggle dashboard menu"
              >
                {dashMobileMenu ? <X className="w-5 h-5" /> : <Menu className="w-5 h-5" />}
              </button>
            </div>
          </div>

          {/* Mobile tab menu */}
          {dashMobileMenu && (
            <div className="md:hidden border-t border-white/[0.06] bg-background/95 backdrop-blur-md fade-in mobile-nav-slide">
              <nav className="px-4 py-3 space-y-1 overflow-x-auto">
                <button
                  onClick={() => { setTheme(theme === 'dark' ? 'light' : 'dark'); setDashMobileMenu(false); }}
                  className="flex items-center gap-3 w-full text-left px-3 py-2.5 rounded-lg text-sm text-muted-foreground hover:text-foreground hover:bg-white/[0.03] transition-colors"
                >
                  {theme === 'dark' ? <Sun className="w-4 h-4" /> : <Moon className="w-4 h-4" />}
                  {theme === 'dark' ? 'Light mode' : 'Dark mode'}
                </button>
                <div className="h-px bg-white/[0.06] my-1" />
                {DASH_TABS.map((tab) => {
                  const Icon = tab.icon;
                  return (
                    <button
                      key={tab.id}
                      onClick={() => { store.setActiveDashTab(tab.id); setDashMobileMenu(false); }}
                      className={`flex items-center gap-3 w-full text-left px-3 py-2.5 rounded-lg text-sm transition-colors ${
                        store.activeDashTab === tab.id
                          ? 'bg-amber-500/10 text-amber-500'
                          : 'text-muted-foreground hover:text-foreground hover:bg-white/[0.03]'
                      }`}
                    >
                      <Icon className="w-4 h-4" />
                      {tab.label}
                    </button>
                  );
                })}
              </nav>
            </div>
          )}
        </header>

        {/* ── Dashboard Tabs (desktop) ── */}
        <div className="hidden md:block border-b border-white/[0.06] bg-white/[0.01]">
          <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
            <nav className="flex gap-1 -mb-px overflow-x-auto" aria-label="Dashboard tabs">
              {DASH_TABS.map((tab) => {
                const Icon = tab.icon;
                return (
                  <button
                    key={tab.id}
                    onClick={() => store.setActiveDashTab(tab.id)}
                    className={`dash-tab flex items-center gap-2 ${store.activeDashTab === tab.id ? 'active' : ''}`}
                  >
                    <Icon className="w-4 h-4" />
                    {tab.label}
                  </button>
                );
              })}
            </nav>
          </div>
        </div>

        {/* ── Dashboard Content ── */}
        <main className="flex-1 max-w-7xl mx-auto w-full px-4 sm:px-6 lg:px-8 py-6 sm:py-8">
          <div className="view-enter">
          {/* ── Stats Overview ── */}
          <section className="grid grid-cols-2 lg:grid-cols-4 gap-3 mb-6" aria-label="Dashboard statistics">
            <div className="stat-card-glass card-accent-amber card-enter">
              <div className="flex items-center gap-2 mb-1">
                <FileText className="w-4 h-4 text-amber-500" />
                <span className="text-xs text-muted-foreground font-medium uppercase tracking-wider">Total Invoices</span>
              </div>
              <div className="text-2xl font-bold text-foreground">{store.invoices.length}</div>
            </div>
            <div className="stat-card-glass card-accent-teal card-enter">
              <div className="flex items-center gap-2 mb-1">
                <CircleDollarSign className="w-4 h-4 text-teal-500" />
                <span className="text-xs text-muted-foreground font-medium uppercase tracking-wider">Total Amount</span>
              </div>
              <div className="text-2xl font-bold text-foreground">
                {formatCurrency(store.invoices.reduce((sum, inv) => sum + (inv.total ?? 0), 0))}
              </div>
            </div>
            <div className="stat-card-glass card-accent-red card-enter">
              <div className="flex items-center gap-2 mb-1">
                <AlertCircle className="w-4 h-4 text-red-400" />
                <span className="text-xs text-muted-foreground font-medium uppercase tracking-wider">Duplicates</span>
              </div>
              <div className="text-2xl font-bold text-foreground">{store.invoices.filter(i => i.isDuplicate).length}</div>
            </div>
            <div className="stat-card-glass card-accent-green card-enter">
              <div className="flex items-center gap-2 mb-1">
                <TrendingUp className="w-4 h-4 text-green-400" />
                <span className="text-xs text-muted-foreground font-medium uppercase tracking-wider">Avg Confidence</span>
              </div>
              <div className="text-2xl font-bold text-foreground">
                {store.invoices.length > 0
                  ? `${((store.invoices.reduce((sum, inv) => sum + (inv.confidence ?? 0), 0) / store.invoices.length) * 100).toFixed(1)}%`
                  : '--'}
              </div>
            </div>
          </section>

          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {/* TAB 1: UPLOAD                                                          */}
          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {store.activeDashTab === 'upload' && (
            <section className="fade-in tab-content-area">
              {/* Welcome Panel */}
              <div className="glass-card welcome-panel p-5 mb-6 card-enter">
                <div className="relative">
                  <div className="flex items-center gap-3 mb-3">
                    <div className="w-10 h-10 rounded-xl bg-amber-500/10 flex items-center justify-center">
                      <Sparkles className="w-5 h-5 text-amber-500" />
                    </div>
                    <div>
                      <h2 className="text-lg font-bold">Welcome back, {store.user?.name?.split(' ')[0] || 'there'}!</h2>
                      <p className="text-sm text-muted-foreground">Here&apos;s a quick overview of your account</p>
                    </div>
                    <span className="ml-auto hidden sm:inline-flex items-center gap-1.5 px-2.5 py-1 rounded-full text-xs font-medium bg-amber-500/10 text-amber-500 capitalize badge-pill">
                      <span className="badge-pill-dot bg-amber-500" />
                      <Crown className="w-3 h-3" />
                      {store.user?.plan || 'Free'} Plan
                    </span>
                  </div>
                  <div className="grid grid-cols-2 sm:grid-cols-4 gap-3 mt-4">
                    <button onClick={() => store.setActiveDashTab('invoices')} className="welcome-stat-btn">
                      <FileText className="w-4 h-4 welcome-stat-icon" />
                      <div>
                        <div className="text-lg font-bold">{store.invoices.length}</div>
                        <div className="text-xs text-muted-foreground">Invoices</div>
                      </div>
                    </button>
                    <button onClick={() => store.setActiveDashTab('analytics')} className="welcome-stat-btn">
                      <TrendingUp className="w-4 h-4 welcome-stat-icon" />
                      <div>
                        <div className="text-lg font-bold">{formatCurrency(store.invoices.reduce((s, i) => s + (i.total ?? 0), 0))}</div>
                        <div className="text-xs text-muted-foreground">Total Spent</div>
                      </div>
                    </button>
                    <button onClick={() => store.setActiveDashTab('invoices')} className="welcome-stat-btn">
                      <AlertCircle className="w-4 h-4 welcome-stat-icon" />
                      <div>
                        <div className="text-lg font-bold">{store.invoices.filter(i => i.isDuplicate).length}</div>
                        <div className="text-xs text-muted-foreground">Duplicates</div>
                      </div>
                    </button>
                    <button onClick={() => store.setActiveDashTab('activity')} className="welcome-stat-btn">
                      <Clock className="w-4 h-4 welcome-stat-icon" />
                      <div>
                        <div className="text-lg font-bold">{activityLogs.length}</div>
                        <div className="text-xs text-muted-foreground">Activities</div>
                      </div>
                    </button>
                  </div>
                </div>
              </div>
              <div className="mb-4">
                <h2 className="text-xl font-bold">Upload Invoices</h2>
                <p className="text-sm text-muted-foreground mt-1">Drag and drop PDF or image files to extract invoice data</p>
              </div>

              {/* Usage Progress */}
              <div className="glass-card p-4 mb-6">
                <div className="flex items-center justify-between mb-2">
                  <span className="text-sm text-muted-foreground">Monthly usage</span>
                  <span className="text-sm font-medium">
                    {invoiceCount} / {planLimit === Infinity ? 'Unlimited' : planLimit}
                  </span>
                </div>
                <div className="h-2 w-full bg-zinc-800 rounded-full overflow-hidden">
                  <div
                    className={`progress-bar ${usagePercent > 90 ? '!bg-red-500' : ''}`}
                    style={{ width: `${planLimit === Infinity ? 0 : usagePercent}%` }}
                  />
                </div>
              </div>

              {/* Drop Zone */}
              <div
                className={`drop-zone drop-zone-animated p-8 sm:p-12 text-center ${dragOver ? 'drag-over' : ''}`}
                onDragOver={handleDragOver}
                onDragLeave={handleDragLeave}
                onDrop={handleDrop}
                onClick={() => fileInputRef.current?.click()}
                role="button"
                tabIndex={0}
                aria-label="Click or drag files to upload"
                onKeyDown={(e) => { if (e.key === 'Enter' || e.key === ' ') fileInputRef.current?.click(); }}
              >
                <input
                  ref={fileInputRef}
                  type="file"
                  multiple
                  accept=".pdf,.png,.jpg,.jpeg"
                  className="hidden"
                  onChange={handleFileSelect}
                />
                <Upload className="w-10 h-10 text-amber-500/60 mx-auto mb-4" />
                <p className="text-sm font-medium mb-1">
                  Drop your invoice files here, or click to browse
                </p>
                <p className="text-xs text-muted-foreground">
                  Supports PDF, PNG, JPG, JPEG. You can upload multiple files at once.
                </p>
              </div>

              {/* Selected Files List */}
              {selectedFiles.length > 0 && (
                <div className="glass-card p-4 mt-4 fade-in">
                  <h3 className="text-sm font-medium mb-3">{selectedFiles.length} file(s) selected</h3>
                  <ul className="space-y-2">
                    {selectedFiles.map((file, idx) => (
                      <li key={`${file.name}-${idx}`} className="flex items-center justify-between text-sm py-2 px-3 rounded-lg bg-white/[0.02]">
                        <div className="flex items-center gap-2 min-w-0">
                          <FileText className="w-4 h-4 text-amber-500 shrink-0" />
                          <span className="truncate">{file.name}</span>
                          <span className="text-xs text-muted-foreground shrink-0">
                            {(file.size / 1024).toFixed(1)} KB
                          </span>
                        </div>
                        <button
                          onClick={(e) => { e.stopPropagation(); removeFile(idx); }}
                          className="p-1 rounded text-muted-foreground hover:text-red-400 transition-colors shrink-0"
                          aria-label={`Remove ${file.name}`}
                        >
                          <X className="w-4 h-4" />
                        </button>
                      </li>
                    ))}
                  </ul>
                  <button
                    onClick={fetchUpload}
                    disabled={store.uploadLoading}
                    className="btn-primary text-sm mt-4 w-full flex items-center justify-center gap-2 disabled:opacity-50"
                  >
                    {store.uploadLoading ? (
                      <>
                        <Loader2 className="w-4 h-4 animate-spin" />
                        Processing...
                      </>
                    ) : (
                      <>
                        <Upload className="w-4 h-4" />
                        Upload and Extract
                      </>
                    )}
                  </button>
                </div>
              )}

              {/* Upload Results */}
              {store.uploadResults && store.uploadResults.length > 0 && (
                <div className="mt-6 fade-in">
                  <h3 className="text-sm font-medium mb-3 flex items-center gap-2">
                    <CheckCircle className="w-4 h-4 text-green-500" />
                    Results
                  </h3>
                  <div className="glass-card overflow-hidden">
                    <div className="max-h-96 overflow-y-auto scrollbar-thin">
                      <table className="data-table text-sm">
                        <thead className="border-b border-white/[0.06] bg-white/[0.02]">
                          <tr>
                            <th className="text-left px-4 py-3 font-medium text-muted-foreground">Vendor</th>
                            <th className="text-left px-4 py-3 font-medium text-muted-foreground">Invoice #</th>
                            <th className="text-right px-4 py-3 font-medium text-muted-foreground">Amount</th>
                            <th className="text-right px-4 py-3 font-medium text-muted-foreground">Confidence</th>
                            <th className="text-center px-4 py-3 font-medium text-muted-foreground">Status</th>
                          </tr>
                        </thead>
                        <tbody>
                          {store.uploadResults.map((inv) => (
                            <tr key={inv.id} className="border-b border-white/[0.04] hover:bg-white/[0.02]">
                              <td className="px-4 py-3">{inv.vendor || '--'}</td>
                              <td className="px-4 py-3 text-muted-foreground">{inv.invNumber || '--'}</td>
                              <td className="px-4 py-3 text-right font-medium">{formatCurrency(inv.total, inv.currency)}</td>
                              <td className="px-4 py-3 text-right">{inv.confidence ? `${(inv.confidence * 100).toFixed(1)}%` : '--'}</td>
                              <td className="px-4 py-3 text-center">
                                <span className={`inline-block px-2.5 py-0.5 rounded-full text-xs font-medium ${
                                  inv.isDuplicate ? 'status-duplicate' : 'status-done'
                                }`}>
                                  {inv.isDuplicate ? 'Duplicate' : 'Done'}
                                </span>
                              </td>
                            </tr>
                          ))}
                        </tbody>
                      </table>
                    </div>
                  </div>
                </div>
              )}

              {/* Empty State */}
              {!store.uploadLoading && (!store.uploadResults || store.uploadResults.length === 0) && selectedFiles.length === 0 && (
                <div className="text-center py-8 text-muted-foreground">
                  <Inbox className="w-10 h-10 mx-auto mb-3 opacity-40" />
                  <p className="text-sm">Upload your first invoice to get started</p>
                </div>
              )}
            </section>
          )}

          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {/* TAB 2: INVOICES                                                        */}
          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {store.activeDashTab === 'invoices' && (
            <section className="fade-in tab-content-area">
              <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4 mb-6">
                <div>
                  <h2 className="text-xl font-bold">Invoices</h2>
                  <p className="text-sm text-muted-foreground mt-1">
                    {filteredInvoices.length} invoice(s) found
                    <span className="ml-2 text-xs text-muted-foreground/60">Ctrl+K</span>
                  </p>
                </div>
                <button
                  onClick={() => fetchInvoices(invoiceFilter)}
                  className="flex items-center gap-2 text-sm text-muted-foreground hover:text-foreground transition-colors self-start"
                >
                  <RefreshCw className="w-4 h-4" />
                  Refresh
                </button>
              </div>

              {/* Search and Filter */}
              <div className="flex flex-col sm:flex-row gap-3 mb-4">
                <div className="relative flex-1">
                  <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
                  <input
                    type="text"
                    value={invoiceSearch}
                    onChange={(e) => setInvoiceSearch(e.target.value)}
                    placeholder="Search by vendor name..."
                    className="input-field input-field-glow pl-10"
                  />
                </div>
                <div className="flex gap-2">
                  {(['all', 'done', 'review', 'duplicates'] as const).map((f) => (
                    <button
                      key={f}
                      onClick={() => setInvoiceFilter(f)}
                      className={`px-3 py-2 rounded-lg text-xs font-medium transition-colors ${
                        invoiceFilter === f
                          ? 'bg-amber-500 text-zinc-900'
                          : 'bg-white/[0.04] text-muted-foreground hover:text-foreground border border-white/[0.08]'
                      }`}
                    >
                      {f === 'all' ? 'All' : f === 'done' ? 'Done' : f === 'review' ? 'Review' : 'Duplicates'}
                    </button>
                  ))}
                </div>
              </div>

              {/* Date Range Filter */}
              <div className="flex flex-col sm:flex-row gap-3 mb-4">
                <div className="flex-1">
                  <label className="input-label">From Date</label>
                  <input
                    type="date"
                    value={dateFrom}
                    onChange={(e) => setDateFrom(e.target.value)}
                    className="input-field input-field-glow"
                  />
                </div>
                <div className="flex-1">
                  <label className="input-label">To Date</label>
                  <input
                    type="date"
                    value={dateTo}
                    onChange={(e) => setDateTo(e.target.value)}
                    className="input-field input-field-glow"
                  />
                </div>
                {(dateFrom || dateTo) && (
                  <div className="flex items-end">
                    <button
                      onClick={() => { setDateFrom(''); setDateTo(''); }}
                      className="px-3 py-2.5 rounded-lg text-xs font-medium text-muted-foreground hover:text-foreground border border-white/[0.08] hover:border-white/[0.15] transition-colors"
                    >
                      Clear dates
                    </button>
                  </div>
                )}
              </div>

              {/* Duplicate Alert Panel */}
{!store.isLoading && store.invoices.some(i => i.isDuplicate) && (
  <div className="glass-card duplicate-alert p-4 mb-4 card-enter">
    <div className="flex items-start gap-3">
      <div className="w-10 h-10 rounded-xl bg-amber-500/10 flex items-center justify-center shrink-0">
        <CopyCheck className="w-5 h-5 text-amber-500" />
      </div>
      <div className="flex-1 min-w-0">
        <h3 className="text-sm font-semibold text-amber-500">Duplicate Invoices Detected</h3>
        <p className="text-xs text-muted-foreground mt-1">
          {store.invoices.filter(i => i.isDuplicate).length} potential duplicate(s) found. Review and decide whether to keep or remove them.
        </p>
        <div className="flex flex-wrap gap-2 mt-3">
          <button
            onClick={() => { setInvoiceFilter('duplicates'); }}
            className="flex items-center gap-1.5 text-xs font-medium px-3 py-1.5 rounded-lg bg-amber-500/10 text-amber-400 hover:bg-amber-500/20 transition-colors"
          >
            <Eye className="w-3.5 h-3.5" />
            View Duplicates
          </button>
          <button
            onClick={() => {
              const dupIds = store.invoices.filter(i => i.isDuplicate).map(i => i.id);
              if (window.confirm(`Delete ${dupIds.length} duplicate invoice(s)?`)) {
                Promise.all(dupIds.map(id => fetch('/api/invoices', { method: 'DELETE', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ id }) })))
                  .then(() => { toast.success(`${dupIds.length} duplicate(s) removed`); fetchInvoices(invoiceFilter); })
                  .catch(() => toast.error('Failed to remove duplicates'));
              }
            }}
            className="flex items-center gap-1.5 text-xs font-medium px-3 py-1.5 rounded-lg bg-red-500/10 text-red-400 hover:bg-red-500/20 transition-colors"
          >
            <Trash2 className="w-3.5 h-3.5" />
            Remove All Duplicates
          </button>
        </div>
      </div>
    </div>
  </div>
)}

              {/* Selection Toolbar */}
              {selectedInvoices.size > 0 && (
                <div className="flex items-center justify-between p-3 mb-4 rounded-lg bg-amber-500/10 border border-amber-500/20 fade-in">
                  <span className="text-sm font-medium text-amber-500">
                    {selectedInvoices.size} invoice(s) selected
                  </span>
                  <div className="flex items-center gap-2">
                    <button
                      onClick={() => setSelectedInvoices(new Set())}
                      className="text-xs text-muted-foreground hover:text-foreground transition-colors px-2 py-1"
                    >
                      Clear selection
                    </button>
                    <button
                      onClick={fetchBatchDelete}
                      className="flex items-center gap-1.5 text-xs font-medium px-3 py-1.5 rounded-lg bg-red-500/10 text-red-400 hover:bg-red-500/20 transition-colors"
                    >
                      <Trash2 className="w-3.5 h-3.5" />
                      Delete Selected
                    </button>
                  </div>
                </div>
              )}

              {/* Loading Skeletons */}
              {store.isLoading && (
                <div className="glass-card p-4 space-y-3">
                  {Array.from({ length: 5 }).map((_, i) => (
                    <div key={i} className="skeleton-shimmer h-12 w-full" />
                  ))}
                </div>
              )}

              {/* Invoice Table */}
              {!store.isLoading && filteredInvoices.length > 0 && (
                <div className="glass-card overflow-hidden">
                  <div className="max-h-96 overflow-y-auto scrollbar-thin">
                    <table className="data-table text-sm">
                      <thead className="border-b border-white/[0.06] bg-white/[0.02] sticky top-0">
                        <tr>
                          <th className="px-3 py-3 w-10">
                            <input
                              type="checkbox"
                              checked={selectedInvoices.size === filteredInvoices.length && filteredInvoices.length > 0}
                              onChange={toggleSelectAll}
                              className="invoice-checkbox"
                              aria-label="Select all invoices"
                            />
                          </th>
                          <th
                            className="sort-header text-left px-4 py-3 font-medium text-muted-foreground"
                            onClick={() => toggleSort('vendor')}
                          >
                            <div className="flex items-center gap-1">
                              Vendor
                              {sortField === 'vendor' ? (
                                <span className="sort-indicator">{sortDir === 'asc' ? '↑' : '↓'}</span>
                              ) : (
                                <span className="sort-header-inactive">↕</span>
                              )}
                            </div>
                          </th>
                          <th
                            className="sort-header text-left px-4 py-3 font-medium text-muted-foreground hidden sm:table-cell"
                            onClick={() => toggleSort('invNumber')}
                          >
                            <div className="flex items-center gap-1">
                              Invoice #
                              {sortField === 'invNumber' ? (
                                <span className="sort-indicator">{sortDir === 'asc' ? '↑' : '↓'}</span>
                              ) : (
                                <span className="sort-header-inactive">↕</span>
                              )}
                            </div>
                          </th>
                          <th
                            className="sort-header text-left px-4 py-3 font-medium text-muted-foreground hidden md:table-cell"
                            onClick={() => toggleSort('invDate')}
                          >
                            <div className="flex items-center gap-1">
                              Date
                              {sortField === 'invDate' ? (
                                <span className="sort-indicator">{sortDir === 'asc' ? '↑' : '↓'}</span>
                              ) : (
                                <span className="sort-header-inactive">↕</span>
                              )}
                            </div>
                          </th>
                          <th
                            className="sort-header text-right px-4 py-3 font-medium text-muted-foreground"
                            onClick={() => toggleSort('amount')}
                          >
                            <div className="flex items-center justify-end gap-1">
                              Amount
                              {sortField === 'amount' ? (
                                <span className="sort-indicator">{sortDir === 'asc' ? '↑' : '↓'}</span>
                              ) : (
                                <span className="sort-header-inactive">↕</span>
                              )}
                            </div>
                          </th>
                          <th
                            className="sort-header text-right px-4 py-3 font-medium text-muted-foreground hidden sm:table-cell"
                            onClick={() => toggleSort('total')}
                          >
                            <div className="flex items-center justify-end gap-1">
                              Total
                              {sortField === 'total' ? (
                                <span className="sort-indicator">{sortDir === 'asc' ? '↑' : '↓'}</span>
                              ) : (
                                <span className="sort-header-inactive">↕</span>
                              )}
                            </div>
                          </th>
                          <th
                            className="sort-header text-center px-4 py-3 font-medium text-muted-foreground"
                            onClick={() => toggleSort('status')}
                          >
                            <div className="flex items-center justify-center gap-1">
                              Status
                              {sortField === 'status' ? (
                                <span className="sort-indicator">{sortDir === 'asc' ? '↑' : '↓'}</span>
                              ) : (
                                <span className="sort-header-inactive">↕</span>
                              )}
                            </div>
                          </th>
                          <th
                            className="sort-header text-right px-4 py-3 font-medium text-muted-foreground hidden lg:table-cell"
                            onClick={() => toggleSort('confidence')}
                          >
                            <div className="flex items-center justify-end gap-1">
                              Confidence
                              {sortField === 'confidence' ? (
                                <span className="sort-indicator">{sortDir === 'asc' ? '↑' : '↓'}</span>
                              ) : (
                                <span className="sort-header-inactive">↕</span>
                              )}
                            </div>
                          </th>
                          <th className="text-center px-4 py-3 font-medium text-muted-foreground" colSpan={2}>Actions</th>
                        </tr>
                      </thead>
                      <tbody>
                        {filteredInvoices.map((inv) => (
                          <InvoiceTableBody
                            key={inv.id}
                            invoice={inv}
                            isExpanded={expandedInvoice === inv.id}
                            onToggle={() => setExpandedInvoice(expandedInvoice === inv.id ? null : inv.id)}
                            onDelete={() => fetchDeleteInvoice(inv.id)}
                            isSelected={selectedInvoices.has(inv.id)}
                            onSelect={() => toggleSelect(inv.id)}
                            onEdit={() => openEditModal(inv)}
                          />
                        ))}
                      </tbody>
                    </table>
                  </div>
                </div>
              )}

              {/* Empty State */}
              {!store.isLoading && filteredInvoices.length === 0 && (
                <div className="empty-state">
                  <Inbox className="w-12 h-12" />
                  <p className="text-sm mt-2">No invoices found</p>
                  <p className="text-xs text-muted-foreground mt-1">Upload your first invoice to get started</p>
                </div>
              )}
            </section>
          )}

          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {/* TAB 3: ANALYTICS                                                        */}
          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {store.activeDashTab === 'analytics' && (
            <AnalyticsTab invoices={store.invoices} />
          )}

          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {/* TAB 4: AI CHAT                                                         */}
          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {store.activeDashTab === 'chat' && (
            <section className="fade-in tab-content-area">
              <div className="flex items-center justify-between mb-6">
                <div>
                  <h2 className="text-xl font-bold">AI Chat</h2>
                  <p className="text-sm text-muted-foreground mt-1">Ask questions about your invoices</p>
                </div>
                {store.chatHistory.length > 0 && (
                  <button
                    onClick={() => { store.clearChat(); toast.success('Chat cleared'); }}
                    className="text-sm text-muted-foreground hover:text-foreground transition-colors flex items-center gap-1"
                  >
                    <Trash2 className="w-3.5 h-3.5" />
                    Clear
                  </button>
                )}
              </div>

              {/* Plan gate */}
              {store.user.plan === 'free' && (
                <div className="glass-card p-8 text-center mb-6">
                  <Bot className="w-12 h-12 text-amber-500/40 mx-auto mb-4" />
                  <h3 className="text-lg font-semibold mb-2">Upgrade to Use AI Chat</h3>
                  <p className="text-sm text-muted-foreground mb-4">
                    AI Chat is available on Pro and Enterprise plans. Get instant insights about your invoices, spending analysis, and more.
                  </p>
                  <button
                    onClick={() => store.setActiveDashTab('upgrade')}
                    className="btn-primary text-sm inline-flex items-center gap-2"
                  >
                    <Crown className="w-4 h-4" />
                    Upgrade Plan
                  </button>
                </div>
              )}

              {/* Chat Messages */}
              {store.chatHistory.length === 0 && store.user.plan !== 'free' && (
                <div className="glass-card p-12 text-center mb-4">
                  <MessageSquare className="w-12 h-12 text-muted-foreground/30 mx-auto mb-4" />
                  <h3 className="text-base font-medium mb-2">Start a conversation</h3>
                  <p className="text-sm text-muted-foreground mb-6">
                    Ask about your invoices, get spending insights, or request analysis.
                  </p>
                  <div className="flex flex-wrap justify-center gap-2">
                    {['Summarize my invoices', 'Who is my top vendor?', 'Show spending trends'].map((suggestion) => (
                      <button
                        key={suggestion}
                        onClick={() => setChatInput(suggestion)}
                        className="px-3 py-1.5 rounded-full text-xs font-medium bg-white/[0.04] border border-white/[0.08] text-muted-foreground hover:text-foreground hover:bg-white/[0.06] transition-colors"
                      >
                        {suggestion}
                      </button>
                    ))}
                  </div>
                </div>
              )}

              <div className="space-y-4 mb-4 max-h-[500px] overflow-y-auto">
                {store.chatHistory.map((msg, idx) => (
                  <div
                    key={idx}
                    className={`chat-bubble flex ${msg.role === 'user' ? 'justify-end' : 'justify-start'}`}
                  >
                    <div className="flex flex-col">
                      <div className="flex items-end gap-2">
                        {msg.role === 'assistant' && (
                          <div className="w-6 h-6 rounded-full bg-teal-500/20 flex items-center justify-center shrink-0">
                            <Bot className="w-3.5 h-3.5 text-teal-500" />
                          </div>
                        )}
                        <div className={msg.role === 'user' ? 'chat-message-user' : 'chat-message-assistant'}>
                          <p className="whitespace-pre-wrap text-sm leading-relaxed">{msg.content}</p>
                        </div>
                      </div>
                    </div>
                  </div>
                ))}
                {store.chatLoading && (
                  <div className="chat-bubble flex justify-start">
                    <div className="bg-white/[0.06] rounded-2xl rounded-bl-md px-4 py-3 flex items-center gap-1.5">
                      <span className="w-2 h-2 rounded-full bg-muted-foreground typing-dot" />
                      <span className="w-2 h-2 rounded-full bg-muted-foreground typing-dot" />
                      <span className="w-2 h-2 rounded-full bg-muted-foreground typing-dot" />
                    </div>
                  </div>
                )}
                <div ref={chatEndRef} />
              </div>

              {/* Chat Input */}
              {store.user.plan !== 'free' && (
                <div className="flex gap-3">
                  <input
                    type="text"
                    value={chatInput}
                    onChange={(e) => setChatInput(e.target.value)}
                    onKeyDown={(e) => { if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); fetchChat(); } }}
                    placeholder="Ask about your invoices..."
                    disabled={store.chatLoading}
                    className="input-field input-field-glow rounded-xl disabled:opacity-50"
                  />
                  <div className="tooltip-wrapper">
                    <button
                      onClick={fetchChat}
                      disabled={store.chatLoading || !chatInput.trim()}
                      className="p-3 rounded-xl bg-amber-500 text-zinc-900 hover:bg-amber-400 transition-colors disabled:opacity-50"
                      aria-label="Send message"
                    >
                      <Send className="w-5 h-5" />
                    </button>
                    <span className="tooltip-text">Send</span>
                  </div>
                </div>
              )}
            </section>
          )}

          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {/* TAB 5: EXPORT                                                          */}
          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {store.activeDashTab === 'export' && (
            <section className="fade-in tab-content-area">
              <div className="mb-6">
                <h2 className="text-xl font-bold">Export Data</h2>
                <p className="text-sm text-muted-foreground mt-1">Download your invoice data in your preferred format</p>
              </div>

              <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-6">
                {/* CSV Export */}
                <article className="glass-card p-6">
                  <div className="flex items-center gap-3 mb-4">
                    <div className="w-11 h-11 rounded-lg bg-teal-500/10 flex items-center justify-center">
                      <FileDown className="w-5 h-5 text-teal-500" />
                    </div>
                    <div>
                      <h3 className="text-base font-semibold">CSV Export</h3>
                      <p className="text-xs text-muted-foreground">Comma-separated values</p>
                    </div>
                  </div>
                  <p className="text-sm text-muted-foreground mb-6 leading-relaxed">
                    Download all your invoices as a CSV file, compatible with Excel, Google Sheets, and any spreadsheet application. Includes all fields: vendor, amounts, dates, status, and confidence scores.
                  </p>
                  <button
                    onClick={exportCsv}
                    className="w-full py-2.5 rounded-lg bg-teal-500 text-zinc-900 font-medium text-sm hover:bg-teal-400 transition-colors flex items-center justify-center gap-2"
                  >
                    <Download className="w-4 h-4" />
                    Download CSV
                  </button>
                </article>

                {/* JSON Export */}
                <article className="glass-card p-6">
                  <div className="flex items-center gap-3 mb-4">
                    <div className="w-11 h-11 rounded-lg bg-amber-500/10 flex items-center justify-center">
                      <FileJson className="w-5 h-5 text-amber-500" />
                    </div>
                    <div>
                      <div className="flex items-center gap-2">
                        <h3 className="text-base font-semibold">JSON Export</h3>
                        {store.user?.plan === 'free' && (
                          <span className="text-xs font-medium px-2 py-0.5 rounded-full bg-amber-500/10 text-amber-500 border border-amber-500/20">
                            Pro+
                          </span>
                        )}
                      </div>
                      <p className="text-xs text-muted-foreground">Structured JSON data with raw extraction</p>
                    </div>
                  </div>
                  <p className="text-sm text-muted-foreground mb-6 leading-relaxed">
                    Download structured JSON data including raw extraction results, line items, and bank details. Perfect for API integrations and programmatic processing.
                  </p>
                  <button
                    onClick={exportJson}
                    className="btn-primary text-sm w-full flex items-center justify-center gap-2 disabled:opacity-50 disabled:cursor-not-allowed"
                    disabled={store.user?.plan === 'free'}
                  >
                    <Download className="w-4 h-4" />
                    {store.user?.plan === 'free' ? 'Upgrade Required' : 'Download JSON'}
                  </button>
                </article>
              {/* XLSX Export */}
                <article className="glass-card p-6">
                  <div className="flex items-center gap-3 mb-4">
                    <div className="w-11 h-11 rounded-lg bg-amber-500/10 flex items-center justify-center">
                      <FileJson className="w-5 h-5 text-amber-500" />
                    </div>
                    <div>
                      <h3 className="text-base font-semibold">Excel Export</h3>
                      <p className="text-xs text-muted-foreground">XLSX spreadsheet format</p>
                    </div>
                  </div>
                  <p className="text-sm text-muted-foreground mb-6 leading-relaxed">
                    Download a professionally formatted Excel spreadsheet with styled headers, currency formatting, color-coded statuses, and a summary total row. Compatible with Microsoft Excel, Google Sheets, and LibreOffice Calc.
                  </p>
                  <button
                    onClick={() => { window.open('/api/invoices/export/xlsx', '_blank'); toast.success('Excel download started'); }}
                    className="btn-primary text-sm w-full flex items-center justify-center gap-2"
                  >
                    <Download className="w-4 h-4" />
                    Download Excel
                  </button>
                </article>
              </div>

              {/* Empty state hint */}
              {invoiceCount === 0 && (
                <div className="glass-card p-8 text-center mt-6">
                  <Database className="w-10 h-10 text-muted-foreground/30 mx-auto mb-3" />
                  <p className="text-sm text-muted-foreground">No invoices to export yet. Upload some invoices first.</p>
                </div>
              )}
            </section>
          )}

          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {/* TAB 6: UPGRADE                                                         */}
          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {store.activeDashTab === 'upgrade' && (
            <section className="fade-in tab-content-area">
              <div className="mb-6">
                <h2 className="text-xl font-bold">Upgrade Your Plan</h2>
                <p className="text-sm text-muted-foreground mt-1">You are currently on the <span className="text-amber-500 font-medium">{planLabel}</span> plan</p>
              </div>

              <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-6">
                {[
                  { name: 'Free', price: 0, limit: '20 invoices/mo', features: ['Basic extraction', 'CSV export', 'Email support'] },
                  { name: 'Pro', price: 129, limit: '2,000 invoices/mo', features: ['Advanced extraction', 'CSV & JSON export', 'AI Chat assistant', 'API access', 'Priority support'] },
                  { name: 'Business', price: 29, limit: '200 invoices/mo', features: ['Standard extraction', 'CSV & JSON export', 'API access', 'Email & chat support'] },
                  { name: 'Enterprise', price: 499, limit: 'Unlimited', features: ['Custom AI models', 'All export formats', 'Dedicated AI Chat', 'Full API access', 'Dedicated support', 'SLA guarantee'] },
                ].map((plan) => {
                  const isCurrent = plan.name.toLowerCase() === store.user.plan;
                  return (
                    <article
                      key={plan.name}
                      className={`glass-card p-6 flex flex-col relative ${plan.name === 'Pro' ? 'pricing-highlight' : ''}`}
                    >
                      {plan.name === 'Pro' && <div className="pricing-ribbon">Most Popular</div>}
                      <div className="mb-5">
                        <div className="flex items-center justify-between mb-1">
                          <h3 className="text-lg font-semibold">{plan.name}</h3>
                          {isCurrent && (
                            <span className="text-xs font-medium px-2 py-0.5 rounded-full bg-teal-500/10 text-teal-500 border border-teal-500/20">
                              Current
                            </span>
                          )}
                        </div>
                        <div className="text-3xl font-bold text-foreground">
                          ${plan.price}<span className="text-sm font-normal text-muted-foreground">/mo</span>
                        </div>
                        <div className="text-sm text-muted-foreground mt-1">{plan.limit}</div>
                      </div>
                      <ul className="space-y-3 mb-6 flex-1">
                        {plan.features.map((f) => (
                          <li key={f} className="flex items-center gap-2 text-sm text-muted-foreground">
                            <Check className="w-4 h-4 text-teal-500 shrink-0" />
                            {f}
                          </li>
                        ))}
                      </ul>
                      <button
                        onClick={() => {
                          if (isCurrent) return;
                          toast.info('Coming soon! Plan upgrades will be available shortly.');
                        }}
                        disabled={isCurrent}
                        className={`w-full py-2.5 rounded-lg text-sm font-medium transition-colors ${
                          isCurrent
                            ? 'bg-white/[0.04] text-muted-foreground cursor-not-allowed'
                            : 'bg-amber-500 text-zinc-900 hover:bg-amber-400'
                        }`}
                      >
                        {isCurrent ? 'Current Plan' : 'Upgrade'}
                      </button>
                    </article>
                  );
                })}
              </div>
            </section>
          )}

          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {/* TAB 7: API ACCESS                                                      */}
          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {store.activeDashTab === 'api' && (
            <section className="fade-in tab-content-area">
              <div className="mb-6">
                <h2 className="text-xl font-bold">API Access</h2>
                <p className="text-sm text-muted-foreground mt-1">Use your API key to integrate OmniParse into your workflow</p>
              </div>

              {/* API Key Display */}
              <div className="glass-card p-6 mb-6">
                <h3 className="text-sm font-semibold mb-3">Your API Key</h3>
                <div className="flex items-center gap-3">
                  <div className="flex-1 bg-white/[0.04] border border-white/[0.08] rounded-lg px-4 py-2.5 font-mono text-sm overflow-hidden">
                    {showApiKey
                      ? (store.user.apiKey || 'Not available')
                      : (store.user.apiKey ? store.user.apiKey.slice(0, 10) + '...' + store.user.apiKey.slice(-4) : 'Not available')
                    }
                  </div>
                  <div className="tooltip-wrapper">
                    <button
                      onClick={() => setShowApiKey(!showApiKey)}
                      className="p-2.5 rounded-lg bg-white/[0.04] border border-white/[0.08] text-muted-foreground hover:text-foreground transition-colors"
                      aria-label={showApiKey ? 'Hide API key' : 'Show API key'}
                    >
                      {showApiKey ? <EyeOff className="w-4 h-4" /> : <Eye className="w-4 h-4" />}
                    </button>
                    <span className="tooltip-text">{showApiKey ? 'Hide' : 'Show'}</span>
                  </div>
                  <div className="tooltip-wrapper">
                    <button
                      onClick={() => {
                        if (store.user.apiKey) {
                          navigator.clipboard.writeText(store.user.apiKey);
                          toast.success('API key copied to clipboard');
                        }
                      }}
                      className="p-2.5 rounded-lg bg-white/[0.04] border border-white/[0.08] text-muted-foreground hover:text-foreground transition-colors"
                      aria-label="Copy API key"
                    >
                      <Copy className="w-4 h-4" />
                    </button>
                    <span className="tooltip-text">Copy</span>
                  </div>
                </div>
              </div>

              {/* cURL Example */}
              <div className="glass-card p-6 mb-6">
                <h3 className="text-sm font-semibold mb-3 flex items-center gap-2">
                  <Terminal className="w-4 h-4 text-amber-500" />
                  Quick Start Example
                </h3>
                <div className="code-block">
                  <pre>{`curl -X POST /api/invoices/upload \\
  -H "Cookie: op_session=YOUR_SESSION" \\
  -F "files=@invoice.pdf"`}</pre>
                </div>
              </div>

              {/* Endpoint Documentation */}
              <div className="glass-card p-6">
                <h3 className="text-sm font-semibold mb-4">Available Endpoints</h3>
                <div className="space-y-4">
                  {[
                    { method: 'GET', path: '/api/auth/me', desc: 'Get current user info' },
                    { method: 'POST', path: '/api/invoices/upload', desc: 'Upload and process invoice files' },
                    { method: 'GET', path: '/api/invoices', desc: 'List all invoices with optional filters' },
                    { method: 'DELETE', path: '/api/invoices', desc: 'Delete an invoice by ID' },
                    { method: 'GET', path: '/api/invoices/export/csv', desc: 'Export all invoices as CSV' },
                    { method: 'GET', path: '/api/invoices/export/json', desc: 'Export all invoices as JSON (Pro+)' },
                    { method: 'POST', path: '/api/chat', desc: 'Send a message to the AI assistant (Pro+)' },
                  ].map((ep) => (
                    <div key={ep.path + ep.method} className="flex items-start gap-3 py-2 border-b border-white/[0.04] last:border-0">
                      <span className={`text-xs font-bold px-2 py-0.5 rounded ${
                        ep.method === 'GET' ? 'bg-teal-500/10 text-teal-500' :
                        ep.method === 'POST' ? 'bg-amber-500/10 text-amber-500' :
                        'bg-red-500/10 text-red-500'
                      }`}>
                        {ep.method}
                      </span>
                      <div className="min-w-0">
                        <div className="text-sm font-mono text-foreground">{ep.path}</div>
                        <div className="text-xs text-muted-foreground">{ep.desc}</div>
                      </div>
                    </div>
                  ))}
                </div>
              </div>
            </section>
          )}

          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {/* TAB 8: PROFILE                                                         */}
          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {store.activeDashTab === 'profile' && (
            <section className="fade-in tab-content-area">
              <div className="mb-6">
                <h2 className="text-xl font-bold">Profile</h2>
                <p className="text-sm text-muted-foreground mt-1">Manage your account settings</p>
              </div>

              {/* User Info Grid */}
              <div className="glass-card p-6 mb-6">
                <h3 className="text-sm font-semibold mb-4">Account Information</h3>
                <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
                  <div className="p-3 rounded-lg bg-white/[0.02]">
                    <div className="text-xs text-muted-foreground mb-1">Email</div>
                    <div className="text-sm font-medium flex items-center gap-2">
                      <Mail className="w-4 h-4 text-amber-500" />
                      {store.user.email}
                    </div>
                  </div>
                  <div className="p-3 rounded-lg bg-white/[0.02]">
                    <div className="text-xs text-muted-foreground mb-1">Name</div>
                    <div className="text-sm font-medium flex items-center gap-2">
                      <User className="w-4 h-4 text-amber-500" />
                      {store.user.name}
                    </div>
                  </div>
                  <div className="p-3 rounded-lg bg-white/[0.02]">
                    <div className="text-xs text-muted-foreground mb-1">Plan</div>
                    <div className="text-sm font-medium flex items-center gap-2">
                      <Crown className="w-4 h-4 text-amber-500" />
                      {planLabel}
                    </div>
                  </div>
                  <div className="p-3 rounded-lg bg-white/[0.02]">
                    <div className="text-xs text-muted-foreground mb-1">Member Since</div>
                    <div className="text-sm font-medium flex items-center gap-2">
                      <Building2 className="w-4 h-4 text-amber-500" />
                      {new Date(store.user.createdAt).toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' })}
                    </div>
                  </div>
                  <div className="p-3 rounded-lg bg-white/[0.02] sm:col-span-2">
                    <div className="text-xs text-muted-foreground mb-1">API Key</div>
                    <div className="text-sm font-mono text-muted-foreground flex items-center gap-2">
                      <Key className="w-4 h-4 text-amber-500 shrink-0" />
                      <span className="truncate">{store.user.apiKey ? store.user.apiKey.slice(0, 20) + '...' : 'Not available'}</span>
                      {store.user.apiKey && (
                        <div className="tooltip-wrapper">
                          <button
                            onClick={() => {
                              navigator.clipboard.writeText(store.user.apiKey || '');
                              toast.success('Copied to clipboard');
                            }}
                            className="p-1 rounded hover:bg-white/[0.06] transition-colors shrink-0"
                            aria-label="Copy API key"
                          >
                            <Copy className="w-3.5 h-3.5" />
                          </button>
                          <span className="tooltip-text">Copy</span>
                        </div>
                      )}
                    </div>
                  </div>
                </div>
              </div>

              {/* Change Password */}
              <div className="glass-card p-6 mb-6">
                <h3 className="text-sm font-semibold mb-4">Change Password</h3>
                <form
                  onSubmit={async (e) => {
                    e.preventDefault();
                    if (!profileCurrentPw || !profileNewPw || !profileConfirmPw) {
                      toast.error('Please fill in all password fields');
                      return;
                    }
                    setProfilePwLoading(true);
                    try {
                      const res = await fetch('/api/auth/password', {
                        method: 'POST',
                        headers: { 'Content-Type': 'application/json' },
                        body: JSON.stringify({
                          currentPassword: profileCurrentPw,
                          newPassword: profileNewPw,
                          confirmPassword: profileConfirmPw,
                        }),
                      });
                      const data = await res.json();
                      if (!res.ok) {
                        toast.error(data.error || 'Failed to update password');
                        return;
                      }
                      toast.success('Password updated successfully. Please log in again.');
                      setProfileCurrentPw('');
                      setProfileNewPw('');
                      setProfileConfirmPw('');
                      setTimeout(() => { fetchLogout(); }, 1500);
                    } catch {
                      toast.error('Network error. Please try again.');
                    } finally {
                      setProfilePwLoading(false);
                    }
                  }}
                  className="space-y-4"
                >
                  <div>
                    <label className="input-label" htmlFor="current-pw">Current Password</label>
                    <input
                      id="current-pw"
                      type="password"
                      value={profileCurrentPw}
                      onChange={(e) => setProfileCurrentPw(e.target.value)}
                      placeholder="Enter current password"
                      className="input-field input-field-glow"
                    />
                  </div>
                  <div>
                    <label className="input-label" htmlFor="new-pw">New Password</label>
                    <input
                      id="new-pw"
                      type="password"
                      value={profileNewPw}
                      onChange={(e) => setProfileNewPw(e.target.value)}
                      placeholder="Enter new password"
                      className="input-field input-field-glow"
                    />
                    {profileNewPw && (() => {
                      const strength = getPasswordStrength(profileNewPw);
                      return (
                        <div className="mt-2">
                          <div className="h-1.5 w-full bg-zinc-800 rounded-full overflow-hidden">
                            <div className={`h-full ${strength.color} ${strength.width} rounded-full transition-all duration-300`} />
                          </div>
                          <p className="text-xs text-muted-foreground mt-1">{strength.label}</p>
                        </div>
                      );
                    })()}
                  </div>
                  <div>
                    <label className="input-label" htmlFor="confirm-new-pw">Confirm New Password</label>
                    <input
                      id="confirm-new-pw"
                      type="password"
                      value={profileConfirmPw}
                      onChange={(e) => setProfileConfirmPw(e.target.value)}
                      placeholder="Confirm new password"
                      className="input-field input-field-glow"
                    />
                  </div>
                  <button
                    type="submit"
                    disabled={profilePwLoading}
                    className="btn-primary text-sm flex items-center gap-2 disabled:opacity-50"
                  >
                    {profilePwLoading && <Loader2 className="w-4 h-4 animate-spin" />}
                    Update Password
                  </button>
                </form>
              </div>

              {/* Danger Zone */}
              <div className="glass-card p-6 border border-red-500/20">
                <h3 className="text-sm font-semibold mb-2 text-red-400">Danger Zone</h3>
                <p className="text-sm text-muted-foreground mb-4">
                  Permanently delete your account and all associated data. This action cannot be undone.
                </p>
                <button
                  onClick={() => {
                    if (window.confirm('Are you sure you want to delete your account? All your invoices and data will be permanently removed.')) {
                      toast.info('Account deletion feature coming soon');
                    }
                  }}
                  className="px-6 py-2.5 rounded-lg bg-red-500/10 text-red-400 border border-red-500/20 font-medium text-sm hover:bg-red-500/20 transition-colors"
                >
                  Delete Account
                </button>
              </div>
            </section>
          )}

          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {/* TAB 10: SETTINGS                                                       */}
          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {store.activeDashTab === 'settings' && (
            <section className="fade-in tab-content-area">
              <div className="mb-6">
                <h2 className="text-xl font-bold">Settings</h2>
                <p className="text-sm text-muted-foreground mt-1">Customize your dashboard experience</p>
              </div>

              <div className="space-y-6">
                {/* Appearance */}
                <div className="glass-card card-depth p-6 card-enter">
                  <h3 className="text-sm font-semibold mb-4 flex items-center gap-2">
                    <Sun className="w-4 h-4 text-amber-500" />
                    Appearance
                  </h3>
                  <div className="space-y-4">
                    <div className="flex items-center justify-between">
                      <div>
                        <div className="text-sm font-medium">Theme</div>
                        <div className="text-xs text-muted-foreground mt-0.5">Switch between light and dark mode</div>
                      </div>
                      <button
                        onClick={() => setTheme(theme === 'dark' ? 'light' : 'dark')}
                        className="flex items-center gap-2 px-4 py-2 rounded-lg bg-white/[0.04] border border-white/[0.08] hover:border-white/[0.15] transition-colors text-sm"
                      >
                        {theme === 'dark' ? <Sun className="w-4 h-4" /> : <Moon className="w-4 h-4" />}
                        {theme === 'dark' ? 'Light Mode' : 'Dark Mode'}
                      </button>
                    </div>
                    <div className="flex items-center justify-between">
                      <div>
                        <div className="text-sm font-medium">Compact Table View</div>
                        <div className="text-xs text-muted-foreground mt-0.5">Reduce row height in invoice tables</div>
                      </div>
                      <button
                        onClick={() => setCompactView(!compactView)}
                        className={`toggle-switch ${compactView ? 'active' : ''}`}
                      >
                        <span className="toggle-switch-knob" />
                      </button>
                    </div>
                  </div>
                </div>

                {/* Regional */}
                <div className="glass-card card-depth p-6 card-enter" style={{ animationDelay: '0.1s' }}>
                  <h3 className="text-sm font-semibold mb-4 flex items-center gap-2">
                    <Globe className="w-4 h-4 text-teal-500" />
                    Regional
                  </h3>
                  <div className="space-y-4">
                    <div>
                      <label className="text-sm font-medium block mb-1.5">Date Format</label>
                      <div className="flex gap-2">
                        {(['MM/DD/YYYY', 'DD/MM/YYYY', 'YYYY-MM-DD'] as const).map((fmt) => (
                          <button
                            key={fmt}
                            onClick={() => setDateFormat(fmt)}
                            className={`px-3 py-2 rounded-lg text-xs font-medium transition-colors ${
                              dateFormat === fmt
                                ? 'bg-amber-500 text-zinc-900'
                                : 'bg-white/[0.04] text-muted-foreground hover:text-foreground border border-white/[0.08]'
                            }`}
                          >
                            {fmt}
                          </button>
                        ))}
                      </div>
                    </div>
                    <div>
                      <label className="text-sm font-medium block mb-1.5">Default Currency</label>
                      <select
                        value={defaultCurrency}
                        onChange={(e) => setDefaultCurrency(e.target.value)}
                        className="select-field w-full sm:w-48"
                      >
                        <option value="USD">USD - US Dollar</option>
                        <option value="EUR">EUR - Euro</option>
                        <option value="GBP">GBP - British Pound</option>
                        <option value="CAD">CAD - Canadian Dollar</option>
                        <option value="AUD">AUD - Australian Dollar</option>
                        <option value="JPY">JPY - Japanese Yen</option>
                        <option value="CNY">CNY - Chinese Yuan</option>
                      </select>
                    </div>
                  </div>
                </div>

                {/* Notifications & Keyboard */}
                <div className="glass-card card-depth p-6 card-enter" style={{ animationDelay: '0.2s' }}>
                  <h3 className="text-sm font-semibold mb-4 flex items-center gap-2">
                    <Bell className="w-4 h-4 text-amber-500" />
                    Notifications & Shortcuts
                  </h3>
                  <div className="space-y-3">
                    <div className="flex items-center justify-between py-2">
                      <span className="text-sm text-muted-foreground">Global Search</span>
                      <kbd className="kbd">Ctrl+K</kbd>
                    </div>
                    <div className="flex items-center justify-between py-2">
                      <span className="text-sm text-muted-foreground">Keyboard Shortcuts</span>
                      <kbd className="kbd">Ctrl+/</kbd>
                    </div>
                    <div className="flex items-center justify-between py-2">
                      <span className="text-sm text-muted-foreground">Go to Invoices</span>
                      <kbd className="kbd">Ctrl+K</kbd>
                    </div>
                  </div>
                </div>

                {/* Save Button */}
                <div className="flex justify-end">
                  <button
                    onClick={saveSettings}
                    className={`btn-primary px-6 py-2.5 text-sm font-medium ${settingsSaved ? '!bg-green-500' : ''}`}
                  >
                    {settingsSaved ? (
                      <span className="flex items-center gap-2"><Check className="w-4 h-4" /> Saved!</span>
                    ) : 'Save Settings'}
                  </button>
                </div>
              </div>
            </section>
          )}

          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {/* TAB 9: ACTIVITY                                                        */}
          {/* ═══════════════════════════════════════════════════════════════════════ */}
          {store.activeDashTab === 'activity' && (
            <section className="fade-in tab-content-area">
              <div className="mb-6">
                <h2 className="text-xl font-bold">Activity</h2>
                <p className="text-sm text-muted-foreground mt-1">Recent actions and events</p>
              </div>
              <div className="glass-card p-6">
                {activityLoading ? (
                  <div className="space-y-6">
                    {Array.from({ length: 3 }).map((_, i) => (
                      <div key={i} className="flex gap-4">
                        <div className="w-8 h-8 rounded-full bg-white/[0.04] border border-white/[0.08] shrink-0 skeleton-shimmer" />
                        <div className="flex-1 space-y-2 pt-0.5">
                          <div className="skeleton-shimmer h-4 w-2/5" />
                          <div className="skeleton-shimmer h-3 w-3/5" />
                        </div>
                      </div>
                    ))}
                  </div>
                ) : activityLogs.length > 0 ? (
                  <div className="relative">
                    {/* Vertical line */}
                    <div className="absolute left-[15px] top-2 bottom-2 w-px bg-white/[0.06]" />
                    <div className="space-y-6">
                      {activityLogs.map((log) => {
                        const iconMap: Record<string, LucideIcon> = {
                          login: LogIn,
                          upload: Upload,
                          delete: Trash2,
                          export: Download,
                          edit: Pencil,
                          signup: UserPlus,
                          password_change: Lock,
                        };
                        const colorMap: Record<string, string> = {
                          login: 'text-amber-500',
                          upload: 'text-teal-500',
                          delete: 'text-red-400',
                          export: 'text-amber-500',
                          edit: 'text-blue-400',
                          signup: 'text-green-400',
                          password_change: 'text-amber-500',
                        };
                        const ItemIcon = iconMap[log.type] || Clock;
                        const itemColor = colorMap[log.type] || 'text-muted-foreground';
                        return (
                          <div key={log.id} className="relative flex gap-4">
                            <div className="relative z-10 w-8 h-8 rounded-full bg-white/[0.04] border border-white/[0.08] flex items-center justify-center shrink-0">
                              <ItemIcon className={`w-3.5 h-3.5 ${itemColor}`} />
                            </div>
                            <div className="min-w-0 flex-1 pt-0.5">
                              <div className="flex items-center justify-between gap-2">
                                <h4 className="text-sm font-medium">{log.title}</h4>
                                <span className="text-xs text-muted-foreground shrink-0">{relativeTime(log.createdAt)}</span>
                              </div>
                              <p className="text-xs text-muted-foreground mt-0.5">{log.description}</p>
                            </div>
                          </div>
                        );
                      })}
                    </div>
                  </div>
                ) : (
                  <div className="text-center py-8 text-muted-foreground">
                    <Clock className="w-10 h-10 mx-auto mb-3 opacity-40" />
                    <p className="text-sm">No activity yet. Actions will appear here as you use the app.</p>
                  </div>
                )}
              </div>
            </section>
          )}
          </div>
        </main>

        {showCommandPalette && (
          <div className="command-palette-backdrop" onClick={() => setShowCommandPalette(false)}>
            <div className="command-palette" onClick={e => e.stopPropagation()}>
              <div className="command-palette-input">
                <Command className="w-5 h-5 text-muted-foreground shrink-0" />
                <input
                  autoFocus
                  type="text"
                  value={commandSearch}
                  onChange={e => setCommandSearch(e.target.value)}
                  placeholder="Search invoices, navigate tabs..."
                  onKeyDown={e => { if (e.key === 'Escape') setShowCommandPalette(false); }}
                />
                <kbd className="kbd">ESC</kbd>
              </div>
              <div className="command-palette-results scrollbar-thin">
                <div className="command-palette-section-title">Quick Actions</div>
                {DASH_TABS.filter(t => !commandSearch || t.label.toLowerCase().includes(commandSearch.toLowerCase())).map(tab => {
                  const Icon = tab.icon;
                  return (
                    <button
                      key={tab.id}
                      onClick={() => { store.setActiveDashTab(tab.id); setShowCommandPalette(false); setCommandSearch(''); }}
                      className="command-palette-item"
                    >
                      <Icon className="w-4 h-4" />
                      {tab.label}
                    </button>
                  );
                })}
                {commandSearch && (
                  <>
                    <div className="command-palette-section-title" style={{ marginTop: 8 }}>Invoice Results</div>
                    {store.invoices
                      .filter(inv => !commandSearch || inv.vendor?.toLowerCase().includes(commandSearch.toLowerCase()) || inv.invNumber?.toLowerCase().includes(commandSearch.toLowerCase()))
                      .slice(0, 5)
                      .map(inv => (
                        <button
                          key={inv.id}
                          onClick={() => { store.setActiveDashTab('invoices'); setExpandedInvoice(inv.id); setShowCommandPalette(false); setCommandSearch(''); }}
                          className="command-palette-item justify-between"
                        >
                          <div>
                            <div className="font-medium text-foreground">{inv.vendor || 'Unknown'}</div>
                            <div className="command-palette-result-sub">{inv.invNumber || 'No invoice #'}</div>
                          </div>
                          <div className="text-right">
                            <div className="font-medium">{formatCurrency(inv.total, inv.currency)}</div>
                            <div className="command-palette-result-sub">{inv.invDate || ''}</div>
                          </div>
                        </button>
                      ))
                    }
                    {store.invoices.filter(inv => inv.vendor?.toLowerCase().includes(commandSearch.toLowerCase()) || inv.invNumber?.toLowerCase().includes(commandSearch.toLowerCase())).length === 0 && (
                      <div className="px-3 py-4 text-center text-sm text-muted-foreground">No matching invoices</div>
                    )}
                  </>
                )}
              </div>
            </div>
          </div>
        )}

        <footer className="dash-footer py-4 pb-[env(safe-area-inset-bottom)] px-4 sm:px-6 lg:px-8">
          <div className="max-w-7xl mx-auto flex flex-col sm:flex-row items-center justify-between gap-2 text-xs text-muted-foreground">
            <div className="flex items-center gap-2">
              <div className="w-4 h-4 rounded-md bg-amber-500 flex items-center justify-center">
                <ScanLine className="w-2.5 h-2.5 text-zinc-900" />
              </div>
              <span>OmniParse AI</span>
            </div>
            <div className="flex items-center gap-4">
              <span>Privacy</span>
              <span>Terms</span>
              <span>Support</span>
            </div>
          </div>
        </footer>

        {showShortcuts && (
          <div className="modal-overlay" onClick={() => setShowShortcuts(false)}>
            <div className="modal-content" onClick={(e) => e.stopPropagation()}>
              <div className="flex items-center justify-between mb-6">
                <h2 className="text-lg font-bold">Keyboard Shortcuts</h2>
                <button
                  onClick={() => setShowShortcuts(false)}
                  className="p-1 rounded-lg text-muted-foreground hover:text-foreground hover:bg-white/[0.06] transition-colors"
                  aria-label="Close"
                >
                  <X className="w-4 h-4" />
                </button>
              </div>
              <div className="space-y-3">
                {[
                  { keys: ['Ctrl', 'K'], desc: 'Go to Invoices' },
                  { keys: ['Ctrl', '/'], desc: 'Show shortcuts' },
                  { keys: ['Enter'], desc: 'Send chat message' },
                ].map((s) => (
                  <div key={s.desc} className="flex items-center justify-between py-2">
                    <span className="text-sm text-muted-foreground">{s.desc}</span>
                    <div className="flex items-center gap-1">
                      {s.keys.map((k, i) => (
                        <span key={k}>
                          <span className="kbd">{k}</span>
                          {i < s.keys.length - 1 && <span className="text-muted-foreground mx-1">+</span>}
                        </span>
                      ))}
                    </div>
                  </div>
                ))}
              </div>
            </div>
          </div>
        )}

        {editingInvoice && (
          <div className="modal-overlay" onClick={() => setEditingInvoice(null)}>
            <div className="modal-content max-w-lg" onClick={(e) => e.stopPropagation()}>
              <div className="flex items-center justify-between mb-6">
                <h2 className="text-lg font-bold">Edit Invoice</h2>
                <button onClick={() => setEditingInvoice(null)} className="p-1 rounded-lg text-muted-foreground hover:text-foreground hover:bg-white/[0.06] transition-colors" aria-label="Close">
                  <X className="w-4 h-4" />
                </button>
              </div>
              <div className="space-y-4">
                {[
                  { key: 'vendor', label: 'Vendor' },
                  { key: 'invNumber', label: 'Invoice Number' },
                  { key: 'invDate', label: 'Invoice Date' },
                  { key: 'dueDate', label: 'Due Date' },
                  { key: 'amount', label: 'Amount' },
                  { key: 'vatAmount', label: 'VAT Amount' },
                  { key: 'total', label: 'Total' },
                  { key: 'currency', label: 'Currency' },
                ].map(({ key, label }) => (
                  <div key={key}>
                    <label className="input-label">{label}</label>
                    <input
                      type="text"
                      value={editForm[key] || ''}
                      onChange={(e) => setEditForm(prev => ({ ...prev, [key]: e.target.value }))}
                      className="input-field input-field-glow"
                    />
                  </div>
                ))}
                <div>
                  <label className="input-label">Status</label>
                  <div className="flex gap-3">
                    {['done', 'review'].map((s) => (
                      <button
                        key={s}
                        onClick={() => setEditForm(prev => ({ ...prev, status: s }))}
                        className={`flex-1 py-2.5 rounded-lg text-sm font-medium transition-colors ${
                          editForm.status === s
                            ? s === 'done' ? 'bg-teal-500 text-zinc-900' : 'bg-amber-500 text-zinc-900'
                            : 'bg-white/[0.04] text-muted-foreground border border-white/[0.08]'
                        }`}
                      >
                        {s === 'done' ? 'Done' : 'Review'}
                      </button>
                    ))}
                  </div>
                </div>
              </div>
              <div className="flex gap-3 mt-6">
                <button onClick={() => setEditingInvoice(null)} className="btn-ghost text-sm flex-1">Cancel</button>
                <button onClick={saveEdit} disabled={editSaving} className="btn-primary text-sm flex-1 flex items-center justify-center gap-2 disabled:opacity-50">
                  {editSaving && <Loader2 className="w-4 h-4 animate-spin" />}
                  Save Changes
                </button>
              </div>
            </div>
          </div>
        )}
      </div>
    );
  }
  return null;
}

// ──────────────────────────────────────────────────────────────────────────────
// ─── Analytics Tab Component ────────────────────────────────────────────────────

const CHART_COLORS = {
  amber: '#F59E0B',
  teal: '#14B8A6',
  red: '#EF4444',
  green: '#22C55E',
  amberLight: 'rgba(245, 158, 11, 0.15)',
};

function AnalyticsTab({ invoices }: { invoices: InvoiceRow[] }) {
  // ── Computed analytics data ──
  const monthlyData = useMemo(() => {
    const map = new Map<string, number>();
    invoices.forEach((inv) => {
      const dateStr = inv.invDate || inv.createdAt;
      if (!dateStr) return;
      const monthKey = dateStr.substring(0, 7); // YYYY-MM
      map.set(monthKey, (map.get(monthKey) || 0) + (inv.total ?? 0));
    });
    return Array.from(map.entries())
      .sort(([a], [b]) => a.localeCompare(b))
      .map(([month, total]) => {
        const [y, m] = month.split('-');
        const label = new Date(Number(y), Number(m) - 1).toLocaleString('en-US', {
          month: 'short', year: '2-digit',
        });
        return { month: label, total: Math.round(total * 100) / 100 };
      });
  }, [invoices]);

  const vendorData = useMemo(() => {
    const map = new Map<string, number>();
    invoices.forEach((inv) => {
      const vendor = inv.vendor || 'Unknown';
      map.set(vendor, (map.get(vendor) || 0) + (inv.total ?? 0));
    });
    return Array.from(map.entries())
      .sort((a, b) => b[1] - a[1])
      .slice(0, 8)
      .map(([name, total]) => ({ name: name.length > 18 ? name.slice(0, 16) + '…' : name, total: Math.round(total * 100) / 100 }));
  }, [invoices]);

  const statusData = useMemo(() => {
    const counts = { Done: 0, Review: 0, Duplicate: 0 };
    invoices.forEach((inv) => {
      if (inv.status === 'done') counts.Done++;
      else if (inv.status === 'review') counts.Review++;
      else if (inv.status === 'duplicate' || inv.isDuplicate) counts.Duplicate++;
    });
    return [
      { name: 'Done', value: counts.Done, color: CHART_COLORS.teal },
      { name: 'Review', value: counts.Review, color: CHART_COLORS.amber },
      { name: 'Duplicate', value: counts.Duplicate, color: CHART_COLORS.red },
    ].filter((d) => d.value > 0);
  }, [invoices]);

  const currencyData = useMemo(() => {
    const map = new Map<string, number>();
    invoices.forEach((inv) => map.set(inv.currency, (map.get(inv.currency) || 0) + 1));
    const entries = Array.from(map.entries()).sort((a, b) => b[1] - a[1]);
    const maxCount = entries.length > 0 ? entries[0][1] : 1;
    return entries.map(([currency, count]) => ({ currency, count, pct: Math.round((count / maxCount) * 100) }));
  }, [invoices]);

  const quickStats = useMemo(() => {
    const totals = invoices.map((inv) => inv.total ?? 0).filter((v) => v > 0);
    const vendors = invoices.filter((inv) => inv.vendor);
    const vendorCounts = new Map<string, number>();
    vendors.forEach((inv) => {
      const v = inv.vendor as string;
      vendorCounts.set(v, (vendorCounts.get(v) || 0) + 1);
    });
    let mostActive = '--';
    let maxCount = 0;
    vendorCounts.forEach((count, name) => {
      if (count > maxCount) { mostActive = name; maxCount = count; }
    });
    return {
      highest: totals.length > 0 ? Math.max(...totals) : null,
      lowest: totals.length > 0 ? Math.min(...totals) : null,
      mostActiveVendor: mostActive,
      average: totals.length > 0 ? totals.reduce((a, b) => a + b, 0) / totals.length : null,
    };
  }, [invoices]);

  const hasData = invoices.length > 0;

  return (
    <section className="fade-in">
      {/* Section Header */}
      <div className="mb-6">
        <h2 className="text-xl font-bold">Analytics</h2>
        <p className="text-sm text-muted-foreground mt-1">Visual insights into your invoice data</p>
      </div>

      {!hasData ? (
        <div className="glass-card p-12 text-center empty-state">
          <BarChart3 className="w-12 h-12" />
          <p className="text-sm mt-2">No invoice data yet</p>
          <p className="text-xs text-muted-foreground mt-1">Upload invoices to see analytics here</p>
        </div>
      ) : (
        <>
          {/* ── Quick Stats Summary ── */}
          <div className="grid grid-cols-2 lg:grid-cols-4 gap-3 mb-6" aria-label="Quick statistics">
            <div className="stat-card-glass card-accent-amber card-enter">
              <div className="flex items-center gap-2 mb-1">
                <TrendingUp className="w-4 h-4 text-amber-500" />
                <span className="text-xs text-muted-foreground font-medium uppercase tracking-wider">Highest Invoice</span>
              </div>
              <div className="text-lg font-bold text-foreground">
                {quickStats.highest !== null ? formatCurrency(quickStats.highest) : '--'}
              </div>
            </div>
            <div className="stat-card-glass card-accent-teal card-enter">
              <div className="flex items-center gap-2 mb-1">
                <TrendingUp className="w-4 h-4 text-teal-500" />
                <span className="text-xs text-muted-foreground font-medium uppercase tracking-wider">Lowest Invoice</span>
              </div>
              <div className="text-lg font-bold text-foreground">
                {quickStats.lowest !== null ? formatCurrency(quickStats.lowest) : '--'}
              </div>
            </div>
            <div className="stat-card-glass card-accent-green card-enter">
              <div className="flex items-center gap-2 mb-1">
                <Building2 className="w-4 h-4 text-green-400" />
                <span className="text-xs text-muted-foreground font-medium uppercase tracking-wider">Most Active Vendor</span>
              </div>
              <div className="text-lg font-bold text-foreground truncate" title={quickStats.mostActiveVendor}>
                {quickStats.mostActiveVendor}
              </div>
            </div>
            <div className="stat-card-glass card-accent-amber card-enter">
              <div className="flex items-center gap-2 mb-1">
                <CircleDollarSign className="w-4 h-4 text-amber-500" />
                <span className="text-xs text-muted-foreground font-medium uppercase tracking-wider">Average Amount</span>
              </div>
              <div className="text-lg font-bold text-foreground">
                {quickStats.average !== null ? formatCurrency(quickStats.average) : '--'}
              </div>
            </div>
          </div>

          {/* ── Charts Grid ── */}
          <div className="grid grid-cols-1 lg:grid-cols-2 gap-6 mb-6">
            {/* a) Monthly Spending Trend */}
            <div className="glass-card p-6">
              <h3 className="text-sm font-semibold mb-3">Monthly Spending Trend</h3>
              {monthlyData.length === 0 ? (
                <div className="h-48 flex items-center justify-center text-muted-foreground text-xs">
                  No date data available
                </div>
              ) : (
                <ResponsiveContainer width="100%" height={220}>
                  <AreaChart data={monthlyData} margin={{ top: 5, right: 10, left: 0, bottom: 0 }}>
                    <defs>
                      <linearGradient id="amberGrad" x1="0" y1="0" x2="0" y2="1">
                        <stop offset="0%" stopColor={CHART_COLORS.amber} stopOpacity={0.3} />
                        <stop offset="100%" stopColor={CHART_COLORS.amber} stopOpacity={0.02} />
                      </linearGradient>
                    </defs>
                    <CartesianGrid strokeDasharray="3 3" stroke="rgba(255,255,255,0.06)" />
                    <XAxis dataKey="month" tick={{ fontSize: 11, fill: '#a1a1aa' }} axisLine={{ stroke: 'rgba(255,255,255,0.1)' }} />
                    <YAxis tick={{ fontSize: 11, fill: '#a1a1aa' }} axisLine={{ stroke: 'rgba(255,255,255,0.1)' }} tickFormatter={(v: number) => `$${(v / 1000).toFixed(v >= 1000 ? 1 : 0)}k`} />
                    <Tooltip
                      contentStyle={{ className: 'recharts-tooltip-custom' }}
                      wrapperStyle={{ outline: 'none' }}
                      formatter={(value: number) => [formatCurrency(value), 'Total']}
                    />
                    <Area type="monotone" dataKey="total" stroke={CHART_COLORS.amber} strokeWidth={2} fill="url(#amberGrad)" />
                  </AreaChart>
                </ResponsiveContainer>
              )}
            </div>

            {/* b) Vendor Spending Breakdown */}
            <div className="glass-card p-6">
              <h3 className="text-sm font-semibold mb-3">Top Vendors by Spending</h3>
              {vendorData.length === 0 ? (
                <div className="h-48 flex items-center justify-center text-muted-foreground text-xs">
                  No vendor data available
                </div>
              ) : (
                <ResponsiveContainer width="100%" height={220}>
                  <BarChart data={vendorData} layout="vertical" margin={{ top: 5, right: 10, left: 0, bottom: 0 }}>
                    <CartesianGrid strokeDasharray="3 3" stroke="rgba(255,255,255,0.06)" horizontal={false} />
                    <XAxis type="number" tick={{ fontSize: 11, fill: '#a1a1aa' }} axisLine={{ stroke: 'rgba(255,255,255,0.1)' }} tickFormatter={(v: number) => `$${(v / 1000).toFixed(v >= 1000 ? 1 : 0)}k`} />
                    <YAxis type="category" dataKey="name" tick={{ fontSize: 11, fill: '#a1a1aa' }} width={110} axisLine={{ stroke: 'rgba(255,255,255,0.1)' }} />
                    <Tooltip
                      contentStyle={{ className: 'recharts-tooltip-custom' }}
                      wrapperStyle={{ outline: 'none' }}
                      formatter={(value: number) => [formatCurrency(value), 'Total']}
                    />
                    <Bar dataKey="total" fill={CHART_COLORS.teal} radius={[0, 4, 4, 0]} barSize={16} />
                  </BarChart>
                </ResponsiveContainer>
              )}
            </div>
          </div>

          <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
            {/* c) Status Distribution */}
            <div className="glass-card p-6">
              <h3 className="text-sm font-semibold mb-3">Status Distribution</h3>
              {statusData.length === 0 ? (
                <div className="h-48 flex items-center justify-center text-muted-foreground text-xs">
                  No status data available
                </div>
              ) : (
                <div className="flex items-center gap-6">
                  <div className="flex-1" style={{ minHeight: 180 }}>
                    <ResponsiveContainer width="100%" height={180}>
                      <PieChart>
                        <Pie
                          data={statusData}
                          cx="50%"
                          cy="50%"
                          innerRadius={50}
                          outerRadius={75}
                          paddingAngle={3}
                          dataKey="value"
                          stroke="none"
                        >
                          {statusData.map((entry, idx) => (
                            <Cell key={`cell-${idx}`} fill={entry.color} />
                          ))}
                        </Pie>
                        <Tooltip
                          contentStyle={{ className: 'recharts-tooltip-custom' }}
                          wrapperStyle={{ outline: 'none' }}
                          formatter={(value: number) => [`${value} invoices`, 'Count']}
                        />
                      </PieChart>
                    </ResponsiveContainer>
                  </div>
                  <div className="flex flex-col gap-3 min-w-[120px]">
                    {statusData.map((entry) => (
                      <div key={entry.name} className="flex items-center gap-2">
                        <span className="w-3 h-3 rounded-full flex-shrink-0" style={{ backgroundColor: entry.color }} />
                        <div>
                          <span className="text-sm text-foreground font-medium">{entry.name}</span>
                          <span className="text-xs text-muted-foreground ml-2">{entry.value}</span>
                        </div>
                      </div>
                    ))}
                  </div>
                </div>
              )}
            </div>

            {/* d) Currency Distribution */}
            <div className="glass-card p-6">
              <h3 className="text-sm font-semibold mb-3">Currency Distribution</h3>
              {currencyData.length === 0 ? (
                <div className="h-48 flex items-center justify-center text-muted-foreground text-xs">
                  No currency data available
                </div>
              ) : (
                <div className="space-y-3 mt-1">
                  {currencyData.map(({ currency, count, pct }) => (
                    <div key={currency} className="flex items-center gap-3">
                      <span className="text-sm text-foreground font-medium w-16 text-right">{currency}</span>
                      <div className="flex-1 h-6 bg-white/[0.04] rounded overflow-hidden">
                        <div
                          className="progress-bar h-full rounded"
                          style={{ width: `${pct}%`, backgroundColor: CHART_COLORS.teal }}
                        />
                      </div>
                      <span className="text-xs text-muted-foreground w-8 text-right">{count}</span>
                    </div>
                  ))}
                </div>
              )}
            </div>
          </div>
        </>
      )}
    </section>
  );
}

// Invoice Table Row Component (with expandable detail panel)
// ──────────────────────────────────────────────────────────────────────────────

function InvoiceTableBody({
  invoice,
  isExpanded,
  onToggle,
  onDelete,
  isSelected,
  onSelect,
  onEdit,
}: {
  invoice: InvoiceRow;
  isExpanded: boolean;
  onToggle: () => void;
  onDelete: () => void;
  isSelected: boolean;
  onSelect: () => void;
  onEdit?: () => void;
}) {
  const statusBadgeClass = invoice.isDuplicate ? 'badge-amber-enhanced' : invoice.status === 'review' ? 'badge-amber-enhanced' : 'badge-teal-enhanced';
  const statusLabel = invoice.isDuplicate ? 'Duplicate' : invoice.status === 'review' ? 'Review' : 'Done';

  return (
    <>
      <tr
        className="invoice-row-enhanced border-b border-white/[0.04]"
        onClick={onToggle}
        role="button"
        tabIndex={0}
        onKeyDown={(e) => { if (e.key === 'Enter' || e.key === ' ') onToggle(); }}
        aria-expanded={isExpanded}
      >
        <td className="px-3 py-3 w-10">
          <input
            type="checkbox"
            checked={isSelected}
            onChange={(e) => { e.stopPropagation(); onSelect(); }}
            onClick={(e) => e.stopPropagation()}
            className="invoice-checkbox"
            aria-label={`Select invoice ${invoice.vendor || invoice.invNumber}`}
          />
        </td>
        <td className="px-4 py-3">
          <div className="flex items-center gap-2">
            {isExpanded ? <ChevronUp className="w-3.5 h-3.5 text-muted-foreground shrink-0" /> : <ChevronDown className="w-3.5 h-3.5 text-muted-foreground shrink-0" />}
            <span className="truncate max-w-[120px] sm:max-w-none">{invoice.vendor || '--'}</span>
          </div>
        </td>
        <td className="px-4 py-3 text-muted-foreground hidden sm:table-cell">{invoice.invNumber || '--'}</td>
        <td className="px-4 py-3 text-muted-foreground hidden md:table-cell">{invoice.invDate || '--'}</td>
        <td className="px-4 py-3 text-right font-medium">{formatCurrency(invoice.amount, invoice.currency)}</td>
        <td className="px-4 py-3 text-right font-medium hidden sm:table-cell">{formatCurrency(invoice.total, invoice.currency)}</td>
        <td className="px-4 py-3 text-center">
          <span className={`badge-pill ${statusBadgeClass}`}>
            <span className={`badge-pill-dot ${invoice.isDuplicate ? 'bg-amber-500' : invoice.status === 'review' ? 'bg-amber-500' : 'bg-teal-500'}`} />
            {statusLabel}
          </span>
        </td>
        <td className="px-4 py-3 text-right hidden lg:table-cell">
          {invoice.confidence ? `${(invoice.confidence * 100).toFixed(1)}%` : '--'}
        </td>
        <td className="px-4 py-3 text-center">
          <div className="flex items-center justify-center gap-1">
            <div className="tooltip-wrapper">
              <button
                onClick={(e) => { e.stopPropagation(); onEdit?.(); }}
                className="p-1.5 rounded-lg text-muted-foreground hover:text-amber-500 hover:bg-amber-500/10 transition-colors"
                aria-label="Edit invoice"
              >
                <Pencil className="w-4 h-4" />
              </button>
              <span className="tooltip-text">Edit</span>
            </div>
            <div className="tooltip-wrapper">
              <button
                onClick={(e) => { e.stopPropagation(); onDelete(); }}
                className="p-1.5 rounded-lg text-muted-foreground hover:text-red-400 hover:bg-red-500/10 transition-colors"
                aria-label="Delete invoice"
              >
                <Trash2 className="w-4 h-4" />
              </button>
              <span className="tooltip-text">Delete</span>
            </div>
          </div>
        </td>
      </tr>
      {isExpanded && (
        <tr>
          <td colSpan={10} className="p-0">
            <div className="px-4 py-4 bg-white/[0.02] border-b border-white/[0.04] fade-in">
              <h4 className="text-xs font-semibold text-muted-foreground uppercase tracking-wider mb-3">Invoice Details</h4>
              <div className="grid grid-cols-2 sm:grid-cols-4 gap-4 mb-4">
                <div>
                  <div className="text-xs text-muted-foreground">Filename</div>
                  <div className="text-sm mt-0.5">{invoice.filename || '--'}</div>
                </div>
                <div>
                  <div className="text-xs text-muted-foreground">Due Date</div>
                  <div className="text-sm mt-0.5">{invoice.dueDate || '--'}</div>
                </div>
                <div>
                  <div className="text-xs text-muted-foreground">VAT Amount</div>
                  <div className="text-sm mt-0.5">{formatCurrency(invoice.vatAmount, invoice.currency)}</div>
                </div>
                <div>
                  <div className="text-xs text-muted-foreground">Created</div>
                  <div className="text-sm mt-0.5">{new Date(invoice.createdAt).toLocaleDateString()}</div>
                </div>
              </div>
              <h4 className="text-xs font-semibold text-muted-foreground uppercase tracking-wider mb-2">Raw JSON</h4>
              <div className="bg-zinc-950 rounded-lg p-4 font-mono text-xs text-muted-foreground max-h-48 overflow-y-auto">
                <pre>{JSON.stringify({
                  vendor: invoice.vendor,
                  invNumber: invoice.invNumber,
                  invDate: invoice.invDate,
                  dueDate: invoice.dueDate,
                  amount: invoice.amount,
                  vatAmount: invoice.vatAmount,
                  total: invoice.total,
                  currency: invoice.currency,
                  confidence: invoice.confidence,
                  status: invoice.status,
                  isDuplicate: invoice.isDuplicate,
                  filename: invoice.filename,
                }, null, 2)}</pre>
              </div>
            </div>
          </td>
        </tr>
      )}
    </>
  );
}