feat: add example components and system pages for UI showcase

- Introduced HeaderExample component for header display.
- Created StyleGuideOne, StyleGuideTwo, and StyleGuideThree components showcasing various UI elements and layouts.
- Added system pages: ComingSoon, Forbidden, Maintenance, and NotFound for better user experience during different states.
- Updated index.ts to export new components for easier access.

apps/web/src/apps/index.tsx

@@ -1,5 +1,6 @@
 import { lazy, Suspense } from 'react';
 import { BrowserRouter, Navigate, Route, Routes } from 'react-router-dom';
+import { NotFound, Forbidden, Maintenance, ComingSoon } from '@repo/ui';
 
 const AuthModule = lazy(() => import('./auth'));
 const AppModule = lazy(() => import('./modules'));
@@ -11,8 +12,10 @@ export default function App() {
         <Routes>
           <Route path="/auth/*" element={<AuthModule />} />
           <Route path="/app/*" element={<AppModule />} />
-          {/* <Route path="/404" element={<NotFoundPage />} />
-                <Route path="/403" element={<ForbiddenPage />} /> */}
+          <Route path="/404" element={<NotFound />} />
+          <Route path="/403" element={<Forbidden />} />
+          <Route path="/maintenance" element={<Maintenance />} />
+          <Route path="/coming-soon" element={<ComingSoon />} />
           <Route path="*" element={<Navigate to="/app" />} />
         </Routes>
       </Suspense>

apps/web/src/apps/modules/index.tsx

@@ -1,10 +1,13 @@
-import { DateServiceComponent } from '@repo/ui';
+import { DateServiceExample, StyleGuideOne, StyleGuideTree, StyleGuideTwo } from '@repo/ui';
 import { Route, Routes } from 'react-router-dom';
 
 export default function AppModule() {
   return (
     <Routes>
-      <Route path="/example/*" element={<DateServiceComponent />} />
+      <Route path="/example/*" element={<DateServiceExample />} />
+      <Route path="/guide-1/*" element={<StyleGuideOne />} />
+      <Route path="/guide-2/*" element={<StyleGuideTwo />} />
+      <Route path="/guide-3/*" element={<StyleGuideTree />} />
     </Routes>
   );
 }

packages/ui/src/components/examples/counter-example.tsx

@@ -1,6 +1,6 @@
 import React, { useState } from 'react';
 
-export const Counter: React.FC = () => {
+export const CounterExample: React.FC = () => {
   const [count, setCount] = useState(0);
 
   return (

packages/ui/src/components/examples/date-example.tsx

@@ -1,7 +1,7 @@
 import { DateService } from '@repo/utils';
 import React, { useState, useEffect, useMemo } from 'react';
 
-export const DateServiceComponent: React.FC = () => {
+export const DateServiceExample: React.FC = () => {
   // --- 0. TIMEZONE CONFIGURATION (ROOT CONTROL) ---
   const [currentZone, setCurrentZone] = useState<string>(DateService.getGlobalTimezone());
 

packages/ui/src/components/examples/encryption-example.tsx

@@ -1,7 +1,7 @@
 import { EncryptionService } from '@repo/utils';
 import React, { useState } from 'react';
 
-export const EncryptionDemo: React.FC = () => {
+export const EncryptionExample: React.FC = () => {
   // --- 1. SETUP INSTANCE ---
   // Kita gunakan Singleton agar hemat memory
   const cryptoService = EncryptionService.getInstance();

packages/ui/src/components/examples/header-example.tsx

@@ -1,10 +1,10 @@
 import React from 'react';
 
-interface HeaderProps {
+interface HeaderExampleProps {
   title: string;
 }
 
-export const Header: React.FC<HeaderProps> = ({ title }) => {
+export const HeaderExample: React.FC<HeaderExampleProps> = ({ title }) => {
   return (
     <header id="header">
       <h1>{title}</h1>

packages/ui/src/components/examples/style-guide-1.tsx

@@ -0,0 +1,208 @@
+import React from 'react';
+
+// --- SHARED SUB-COMPONENTS ---
+const Card = ({
+  title,
+  children,
+  className = '',
+}: {
+  title?: string;
+  children: React.ReactNode;
+  className?: string;
+}) => (
+  <div className={`bg-white border border-gray-200 rounded-lg shadow-sm ${className}`}>
+    {title && (
+      <div className="px-4 py-3 border-b border-gray-100 bg-gray-50/50">
+        <h3 className="text-lg font-semibold text-gray-800">{title}</h3>
+      </div>
+    )}
+    <div className="p-5">{children}</div>
+  </div>
+);
+
+const Badge = ({
+  children,
+  variant = 'info',
+}: {
+  children: React.ReactNode;
+  variant?: 'success' | 'error' | 'warning' | 'info';
+}) => {
+  const styles = {
+    success: 'bg-green-50 text-green-600 border-green-100',
+    error: 'bg-red-50 text-red-600 border-red-100',
+    warning: 'bg-amber-50 text-amber-600 border-amber-100',
+    info: 'bg-brand-50 text-brand-600 border-brand-100',
+  };
+  return (
+    <span className={`px-2 py-0.5 rounded-sm text-xs font-bold border ${styles[variant]} uppercase tracking-wider`}>
+      {children}
+    </span>
+  );
+};
+
+// --- MAIN PAGE COMPONENT ---
+export function StyleGuideOne() {
+  return (
+    <div className="min-h-screen bg-gray-50 text-gray-700 font-sans">
+      {/* 1. OBJECT HEADER (SAP Pattern) */}
+      <div className="bg-white border-b border-gray-200 px-8 py-6 sticky top-0 z-10 shadow-sm">
+        <div className="max-w-7xl mx-auto flex flex-col md:flex-row md:items-center justify-between gap-4">
+          <div>
+            <nav className="text-xs font-bold text-brand-600 uppercase tracking-widest mb-1">
+              Procurement / Purchase Orders
+            </nav>
+            <h1 className="text-xl font-bold text-gray-900 flex items-center gap-3">
+              PO #4500019283
+              <Badge variant="success">Released</Badge>
+            </h1>
+          </div>
+          <div className="flex items-center gap-2">
+            <button className="px-4 py-1.5 border border-gray-300 rounded-md bg-white hover:bg-gray-50 font-medium transition-all shadow-sm">
+              Reject
+            </button>
+            <button className="px-4 py-1.5 bg-brand-500 text-white rounded-md hover:bg-brand-600 font-medium transition-all shadow-sm">
+              Approve Order
+            </button>
+          </div>
+        </div>
+      </div>
+
+      <div className="max-w-7xl mx-auto p-6 space-y-8">
+        {/* 2. ANALYTICS / KPI SECTION */}
+        <div className="grid grid-cols-1 md:grid-cols-4 gap-4">
+          {[
+            { label: 'Total Value', val: '$12,450.00', color: 'text-gray-900' },
+            { label: 'Items Count', val: '24 SKUs', color: 'text-gray-900' },
+            { label: 'Days Overdue', val: '5 Days', color: 'text-red-500' },
+            { label: 'Vendor Rating', val: '4.8 / 5.0', color: 'text-green-600' },
+          ].map((kpi, i) => (
+            <div key={i} className="bg-white p-4 rounded-lg border border-gray-200 shadow-sm">
+              <p className="text-xs font-bold text-gray-500 uppercase tracking-wider">{kpi.label}</p>
+              <p className={`text-xl font-bold mt-1 ${kpi.color}`}>{kpi.val}</p>
+            </div>
+          ))}
+        </div>
+
+        <div className="grid grid-cols-1 lg:grid-cols-3 gap-8">
+          {/* LEFT: FORM & CONTROLS */}
+          <div className="lg:col-span-1 space-y-6">
+            <Card title="General Information">
+              <div className="space-y-4">
+                <div className="flex flex-col gap-1">
+                  <label className="text-sm font-medium text-gray-500">Vendor Name</label>
+                  <input
+                    type="text"
+                    readOnly
+                    className="bg-gray-50 border border-gray-200 rounded-md px-3 py-1.5 text-gray-600 outline-none cursor-not-allowed"
+                    defaultValue="Steel Global Corp"
+                  />
+                </div>
+                <div className="flex flex-col gap-1">
+                  <label className="text-sm font-medium text-gray-500">Shipping Method</label>
+                  <select className="border border-gray-300 rounded-md px-3 py-1.5 bg-white focus:ring-1 focus:ring-brand-500 outline-none">
+                    <option>Sea Freight - Standard</option>
+                    <option>Air Freight - Express</option>
+                  </select>
+                </div>
+                <div className="flex flex-col gap-1">
+                  <label className="text-sm font-medium text-gray-500">Order Priority</label>
+                  <div className="flex gap-4 mt-1">
+                    <label className="flex items-center gap-2 cursor-pointer">
+                      <input type="radio" name="prio" className="accent-brand-500" />{' '}
+                      <span className="text-base">Normal</span>
+                    </label>
+                    <label className="flex items-center gap-2 cursor-pointer">
+                      <input type="radio" name="prio" className="accent-brand-500" defaultChecked />{' '}
+                      <span className="text-base">High</span>
+                    </label>
+                  </div>
+                </div>
+              </div>
+            </Card>
+
+            <Card title="Order Status Logs">
+              <ul className="space-y-4">
+                {[
+                  { time: '10:00 AM', msg: 'Order Created', user: 'System' },
+                  { time: '11:30 AM', msg: 'Manager Approved', user: 'Budi Santoso' },
+                ].map((log, i) => (
+                  <li key={i} className="flex gap-3 border-l-2 border-brand-200 pl-4 relative">
+                    <div className="absolute w-2.5 h-2.5 bg-brand-500 rounded-full -left-[6px] top-1"></div>
+                    <div>
+                      <p className="text-base font-medium text-gray-800">{log.msg}</p>
+                      <p className="text-xs text-gray-500">
+                        {log.time} • By {log.user}
+                      </p>
+                    </div>
+                  </li>
+                ))}
+              </ul>
+            </Card>
+          </div>
+
+          {/* RIGHT: DATA TABLE (The Core of ERP) */}
+          <div className="lg:col-span-2">
+            <Card className="!p-0 overflow-hidden">
+              <div className="p-4 border-b border-gray-100 flex justify-between items-center">
+                <h3 className="text-lg font-semibold text-gray-800">Line Items</h3>
+                <div className="flex gap-2">
+                  <button className="text-xs font-bold text-brand-600 hover:bg-brand-50 px-2 py-1 rounded">
+                    EXPORT CSV
+                  </button>
+                  <button className="text-xs font-bold text-brand-600 hover:bg-brand-50 px-2 py-1 rounded">
+                    PRINT PO
+                  </button>
+                </div>
+              </div>
+
+              <div className="overflow-x-auto">
+                <table className="w-full border-collapse">
+                  <thead>
+                    <tr className="bg-gray-100/80">
+                      <th className="px-4 py-2 text-xs font-bold text-gray-500 uppercase">Material</th>
+                      <th className="px-4 py-2 text-xs font-bold text-gray-500 uppercase">Description</th>
+                      <th className="px-4 py-2 text-xs font-bold text-gray-500 uppercase text-right">Qty</th>
+                      <th className="px-4 py-2 text-xs font-bold text-gray-500 uppercase text-right">Price</th>
+                      <th className="px-4 py-2 text-xs font-bold text-gray-500 uppercase text-right">Total</th>
+                    </tr>
+                  </thead>
+                  <tbody className="divide-y divide-gray-100 text-base">
+                    {[1, 2, 3, 4, 5].map((item) => (
+                      <tr key={item} className="hover:bg-brand-50/20 transition-all cursor-pointer group">
+                        <td className="px-4 py-2 font-mono text-brand-600 group-hover:underline">M-1000{item}</td>
+                        <td className="px-4 py-2 text-gray-800">
+                          Industrial Steel Pipe 2.5" - Grade {item === 2 ? 'B' : 'A'}
+                        </td>
+                        <td className="px-4 py-2 text-right">100.00</td>
+                        <td className="px-4 py-2 text-right">150.00</td>
+                        <td className="px-4 py-2 text-right font-semibold text-gray-900">15,000.00</td>
+                      </tr>
+                    ))}
+                  </tbody>
+                  <tfoot className="bg-gray-50/80 font-bold border-t-2 border-gray-200">
+                    <tr>
+                      <td colSpan={4} className="px-4 py-3 text-right text-gray-500 uppercase text-xs tracking-widest">
+                        Grand Total (Net)
+                      </td>
+                      <td className="px-4 py-3 text-right text-brand-600 text-lg">$ 75,000.00</td>
+                    </tr>
+                  </tfoot>
+                </table>
+              </div>
+            </Card>
+
+            <div className="mt-4 bg-amber-50 border border-amber-100 rounded-lg p-4 flex gap-3">
+              <span className="text-xl">⚠️</span>
+              <div>
+                <p className="text-base font-bold text-amber-800">Budget Warning</p>
+                <p className="text-sm text-amber-700">
+                  This purchase order exceeds the quarterly budget for Department "Steel Fabrication" by 12%.
+                </p>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}

packages/ui/src/components/examples/style-guide-2.tsx

@@ -0,0 +1,257 @@
+import React, { useState } from 'react';
+
+// ==========================================================
+// 1. ATOMIC COMPONENTS (Berdasar Config 13px & Burgundy)
+// ==========================================================
+
+const Card = ({ title, children, className = '', footer }: any) => (
+  <div className={`bg-white border border-gray-200 rounded-lg shadow-sm overflow-hidden ${className}`}>
+    {title && (
+      <div className="px-4 py-3 border-b border-gray-100 bg-gray-50/50 flex justify-between items-center">
+        <h3 className="text-lg font-semibold text-gray-800 tracking-tight">{title}</h3>
+      </div>
+    )}
+    <div className="p-5 text-base">{children}</div>
+    {footer && <div className="px-4 py-3 bg-gray-50 border-t border-gray-100">{footer}</div>}
+  </div>
+);
+
+const Button = ({ children, variant = 'primary', className = '', ...props }: any) => {
+  const styles: any = {
+    primary: 'bg-brand-500 text-white hover:bg-brand-600 shadow-sm border border-brand-600',
+    secondary: 'bg-white border border-gray-300 text-gray-700 hover:bg-gray-50 shadow-xs',
+    ghost: 'text-gray-600 hover:bg-gray-100',
+    danger: 'bg-red-500 text-white hover:bg-red-600',
+  };
+  return (
+    <button
+      className={`px-3 py-1.5 rounded-md font-medium text-base transition-all active:scale-95 disabled:opacity-50 ${styles[variant]} ${className}`}
+      {...props}
+    >
+      {children}
+    </button>
+  );
+};
+
+const Badge = ({ children, variant = 'info' }: any) => {
+  const styles: any = {
+    success: 'bg-green-50 text-green-600 border-green-100',
+    error: 'bg-red-50 text-red-600 border-red-100',
+    warning: 'bg-amber-50 text-amber-600 border-amber-100',
+    info: 'bg-brand-50 text-brand-700 border-brand-100',
+  };
+  return (
+    <span className={`px-2 py-0.5 rounded-sm text-xs font-bold border ${styles[variant]} uppercase tracking-wider`}>
+      {children}
+    </span>
+  );
+};
+
+// ==========================================================
+// 2. MAIN PAGE: ADVANCED STYLE GUIDE
+// ==========================================================
+
+export function StyleGuideTwo() {
+  const [isModalOpen, setIsModalOpen] = useState(false);
+
+  return (
+    <div className="flex min-h-screen bg-gray-50 font-sans text-gray-800">
+      {/* SIDE NAVIGATION */}
+      <aside className="w-64 bg-brand-950 text-white flex flex-col sticky top-0 h-screen shadow-xl shrink-0">
+        <div className="p-6 border-b border-brand-900 flex items-center gap-3">
+          <div className="w-8 h-8 bg-brand-500 rounded-lg flex items-center justify-center font-bold text-xl shadow-inner">
+            B
+          </div>
+          <span className="font-bold text-lg tracking-tight">BURGUNDY_ERP</span>
+        </div>
+
+        <nav className="flex-1 p-4 space-y-1">
+          <p className="text-brand-300 text-[10px] font-bold uppercase tracking-widest px-2 mb-2 opacity-60">
+            Finance Modules
+          </p>
+          <div className="flex items-center gap-3 px-3 py-2 rounded-md bg-brand-500 text-white shadow-lg cursor-pointer">
+            <span>📓</span> <span className="text-base font-medium">General Ledger</span>
+          </div>
+          <div className="flex items-center gap-3 px-3 py-2 rounded-md hover:bg-brand-900 text-brand-100 cursor-pointer transition-colors">
+            <span>📊</span> <span className="text-base font-medium">Cost Analysis</span>
+          </div>
+          <div className="flex items-center gap-3 px-3 py-2 rounded-md hover:bg-brand-900 text-brand-100 cursor-pointer transition-colors">
+            <span>🏦</span> <span className="text-base font-medium">Bank Reconciliation</span>
+          </div>
+        </nav>
+      </aside>
+
+      {/* MAIN CONTENT AREA */}
+      <main className="flex-1 flex flex-col min-w-0">
+        {/* TOP BAR */}
+        <header className="h-14 bg-white border-b border-gray-200 flex items-center justify-between px-8 shrink-0 shadow-sm">
+          <div className="text-sm text-gray-500 font-medium">
+            Master Data <span className="mx-2">/</span>{' '}
+            <span className="text-gray-900 font-bold">Chart of Accounts</span>
+          </div>
+          <div className="flex items-center gap-4">
+            <div className="w-8 h-8 rounded-full bg-brand-100 border border-brand-200 flex items-center justify-center text-brand-700 font-bold text-xs">
+              JD
+            </div>
+          </div>
+        </header>
+
+        {/* CONTENT */}
+        <div className="p-8 space-y-8 overflow-y-auto">
+          {/* HEADER SECTION */}
+          <div className="flex flex-col md:flex-row md:items-center justify-between gap-4">
+            <div>
+              <h2 className="text-2xl font-bold text-gray-900">Account Overview: 110200</h2>
+              <p className="text-base text-gray-500 mt-1">
+                Domestic Trade Accounts Receivable •{' '}
+                <span className="text-brand-600 font-semibold italic">Local Currency (IDR)</span>
+              </p>
+            </div>
+            <div className="flex gap-2">
+              <Button variant="secondary" onClick={() => window.print()}>
+                Print Statement
+              </Button>
+              <Button onClick={() => setIsModalOpen(true)}>Create Entry</Button>
+            </div>
+          </div>
+
+          <div className="grid grid-cols-1 xl:grid-cols-3 gap-8">
+            {/* LEFT: MAIN DATA TABLE */}
+            <div className="xl:col-span-2 space-y-6">
+              <Card title="Recent Transactions">
+                <div className="overflow-x-auto -mx-5 -my-5">
+                  <table className="w-full text-left border-collapse">
+                    <thead>
+                      <tr className="bg-gray-50 border-b border-gray-100">
+                        <th className="px-5 py-3 text-xs font-bold text-gray-500 uppercase">Document</th>
+                        <th className="px-5 py-3 text-xs font-bold text-gray-500 uppercase">Partner</th>
+                        <th className="px-5 py-3 text-xs font-bold text-gray-500 uppercase text-right">Debit</th>
+                        <th className="px-5 py-3 text-xs font-bold text-gray-500 uppercase text-right">Credit</th>
+                        <th className="px-5 py-3 text-xs font-bold text-gray-500 uppercase text-center">Status</th>
+                      </tr>
+                    </thead>
+                    <tbody className="divide-y divide-gray-50">
+                      {[1, 2, 3, 4].map((i) => (
+                        <tr key={i} className="hover:bg-brand-50/20 text-base transition-colors group">
+                          <td className="px-5 py-3 font-mono text-brand-700 font-semibold">INV-2026-00{i}</td>
+                          <td className="px-5 py-3">
+                            <p className="font-medium text-gray-800">Global Tech Solutions</p>
+                            <p className="text-xs text-gray-400">Vendor ID: V-9920</p>
+                          </td>
+                          <td className="px-5 py-3 text-right font-semibold">$ {i * 125}.00</td>
+                          <td className="px-5 py-3 text-right text-gray-300">0.00</td>
+                          <td className="px-5 py-3 text-center">
+                            <Badge variant={i % 2 === 0 ? 'success' : 'warning'}>
+                              {i % 2 === 0 ? 'Cleared' : 'Pending'}
+                            </Badge>
+                          </td>
+                        </tr>
+                      ))}
+                    </tbody>
+                  </table>
+                </div>
+              </Card>
+
+              <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
+                <Card title="Budget Utilization">
+                  <div className="space-y-4">
+                    <div className="w-full bg-gray-100 rounded-full h-3">
+                      <div className="bg-brand-500 h-3 rounded-full" style={{ width: '75%' }}></div>
+                    </div>
+                    <div className="flex justify-between text-sm">
+                      <span className="text-gray-500 font-medium italic underline decoration-brand-200 underline-offset-4">
+                        Spent: $75,000.00
+                      </span>
+                      <span className="text-gray-900 font-bold">Total: $100,000.00</span>
+                    </div>
+                  </div>
+                </Card>
+                <Card title="Quick Insight">
+                  <p className="text-gray-600 leading-relaxed italic">
+                    "Anomali terdeteksi pada baris INV-2026-003. Nilai transaksi melebihi rata-rata bulanan sebesar
+                    40%."
+                  </p>
+                </Card>
+              </div>
+            </div>
+
+            {/* RIGHT: CONFIGURATION & ACTIONS */}
+            <div className="xl:col-span-1 space-y-6">
+              <Card title="Account Settings" footer={<Button className="w-full">Update Control</Button>}>
+                <div className="space-y-4">
+                  <div className="flex flex-col gap-1">
+                    <label className="text-sm font-bold text-gray-500 uppercase tracking-tighter italic">
+                      Reconciliation Type
+                    </label>
+                    <select className="w-full border border-gray-300 rounded-md px-3 py-1.5 bg-white focus:ring-1 focus:ring-brand-500 outline-none">
+                      <option>Automatic Match</option>
+                      <option>Manual Review</option>
+                    </select>
+                  </div>
+                  <div className="flex flex-col gap-1">
+                    <label className="text-sm font-bold text-gray-500 uppercase tracking-tighter italic">
+                      Tax Code
+                    </label>
+                    <input
+                      className="w-full border border-gray-300 rounded-md px-3 py-1.5 outline-none focus:border-brand-500 transition-colors"
+                      placeholder="e.g. VAT_11"
+                    />
+                  </div>
+                  <div className="flex items-center gap-3 py-2 border-t border-gray-50">
+                    <input type="checkbox" className="w-4 h-4 accent-brand-500" id="lock" />
+                    <label htmlFor="lock" className="text-sm font-semibold text-gray-700">
+                      Lock account for posting
+                    </label>
+                  </div>
+                </div>
+              </Card>
+
+              <div className="bg-brand-900 text-white p-5 rounded-lg shadow-lg relative overflow-hidden">
+                <div className="relative z-10">
+                  <h4 className="text-lg font-bold mb-1 italic">Premium Support</h4>
+                  <p className="text-sm text-brand-100 opacity-80">
+                    Butuh bantuan rekonsiliasi? Hubungi konsultan finansial kami.
+                  </p>
+                  <button className="mt-4 text-xs font-bold bg-white text-brand-900 px-3 py-1.5 rounded uppercase tracking-widest shadow-lg">
+                    Chat Konsultan
+                  </button>
+                </div>
+                <div className="absolute -right-4 -bottom-4 text-6xl opacity-10 font-bold">ERP</div>
+              </div>
+            </div>
+          </div>
+        </div>
+      </main>
+
+      {/* 3. SAMPLE MODAL (Overlay) */}
+      {isModalOpen && (
+        <div className="fixed inset-0 bg-brand-950/40 backdrop-blur-sm z-50 flex items-center justify-center p-4">
+          <div className="bg-white rounded-xl shadow-2xl w-full max-w-lg overflow-hidden border border-gray-200">
+            <div className="px-6 py-4 border-b border-gray-100 flex justify-between items-center bg-gray-50/50">
+              <h3 className="text-xl font-bold text-gray-900">New Journal Entry</h3>
+              <button onClick={() => setIsModalOpen(false)} className="text-gray-400 hover:text-gray-600 text-2xl">
+                ×
+              </button>
+            </div>
+            <div className="p-6 space-y-4">
+              <p className="text-base text-gray-600">
+                Silakan masukkan detail entri jurnal baru untuk tahun fiskal 2026.
+              </p>
+              <div className="grid grid-cols-2 gap-4">
+                <div className="col-span-2 border border-brand-100 bg-brand-50/50 p-3 rounded-md italic text-xs text-brand-800">
+                  Info: Pastikan periode pembukuan Januari sudah dibuka sebelum menekan "Post".
+                </div>
+              </div>
+            </div>
+            <div className="px-6 py-4 bg-gray-50 border-t border-gray-100 flex justify-end gap-2">
+              <Button variant="secondary" onClick={() => setIsModalOpen(false)}>
+                Discard
+              </Button>
+              <Button onClick={() => setIsModalOpen(false)}>Post Entry</Button>
+            </div>
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}

packages/ui/src/components/examples/style-guide-3.tsx

@@ -0,0 +1,232 @@
+import React from 'react';
+
+// ==========================================================
+// COMPACT UI COMPONENTS
+// ==========================================================
+
+const SectionTitle = ({ children }: { children: React.ReactNode }) => (
+  <h3 className="text-[11px] font-bold text-gray-500 uppercase tracking-widest mb-2 border-b border-gray-200 pb-1 italic">
+    {children}
+  </h3>
+);
+
+const CompactCard = ({ title, children, footer }: any) => (
+  <div className="bg-white border border-gray-200 rounded shadow-sm flex flex-col">
+    {title && (
+      <div className="px-3 py-1.5 border-b border-gray-100 bg-gray-50/50 flex justify-between items-center">
+        <span className="text-sm font-bold text-gray-700 tracking-tight">{title}</span>
+      </div>
+    )}
+    <div className="p-3 flex-1">{children}</div>
+    {footer && <div className="px-3 py-2 bg-gray-50/80 border-t border-gray-100">{footer}</div>}
+  </div>
+);
+
+const Badge = ({ children, variant = 'info' }: any) => {
+  const styles: any = {
+    success: 'bg-green-50 text-green-700 border-green-200',
+    error: 'bg-red-50 text-red-700 border-red-200',
+    warning: 'bg-amber-50 text-amber-700 border-amber-200',
+    info: 'bg-brand-50 text-brand-700 border-brand-200',
+  };
+  return (
+    <span
+      className={`px-1.5 py-0.5 rounded-sm text-[10px] font-bold border ${styles[variant]} uppercase tracking-tighter`}
+    >
+      {children}
+    </span>
+  );
+};
+
+// ==========================================================
+// MAIN STYLE SHOWCASE
+// ==========================================================
+
+export function StyleGuideTree() {
+  return (
+    <div className="min-h-screen bg-gray-100 p-3 space-y-3 font-sans text-gray-800">
+      {/* GLOBAL ACTION BAR */}
+      <div className="bg-brand-900 text-white p-3 rounded flex justify-between items-center shadow-md">
+        <div className="flex items-center gap-3">
+          <div className="bg-white p-1 rounded text-brand-900 font-bold text-xs uppercase">ERP-SYSTEM</div>
+          <h1 className="text-base font-bold tracking-tight">Financial Postings & Asset Management</h1>
+        </div>
+        <div className="flex gap-2">
+          <button className="bg-brand-700 hover:bg-brand-600 px-3 py-1 rounded text-base font-medium border border-brand-600 transition-all">
+            Simulate
+          </button>
+          <button className="bg-white text-brand-900 hover:bg-gray-100 px-3 py-1 rounded text-base font-bold shadow-sm transition-all">
+            Post Document
+          </button>
+        </div>
+      </div>
+
+      <div className="grid grid-cols-12 gap-3">
+        {/* ROW 1: ANALYTICS & STATS (Top Row) */}
+        {[
+          { label: 'Total Debit', val: 'IDR 4.500.000.000', sub: '24 Entries Today', color: 'text-gray-900' },
+          { label: 'Total Credit', val: 'IDR 4.500.000.000', sub: 'Balanced', color: 'text-green-600' },
+          { label: 'Unposted Items', val: '12 Documents', sub: 'High Priority', color: 'text-amber-600' },
+          { label: 'System Health', val: '99.9%', sub: 'No Latency', color: 'text-brand-600' },
+        ].map((stat, i) => (
+          <div key={i} className="col-span-12 md:col-span-3 bg-white p-3 rounded border border-gray-200 shadow-sm">
+            <p className="text-[10px] font-bold text-gray-400 uppercase tracking-widest">{stat.label}</p>
+            <p className={`text-lg font-bold ${stat.color} tracking-tight`}>{stat.val}</p>
+            <p className="text-[11px] text-gray-400 font-medium italic">{stat.sub}</p>
+          </div>
+        ))}
+
+        {/* ROW 2: FORMS & CONTROLS (Left Panel) */}
+        <div className="col-span-12 lg:col-span-4 space-y-3">
+          <CompactCard title="Document Header">
+            <div className="grid grid-cols-2 gap-3">
+              <div className="col-span-1 flex flex-col">
+                <label className="text-xs font-bold text-gray-400 uppercase italic mb-1 tracking-tight">
+                  Posting Date
+                </label>
+                <input
+                  type="date"
+                  className="border border-gray-300 rounded px-2 py-1 text-base outline-none focus:border-brand-500 bg-gray-50"
+                  defaultValue="2026-01-19"
+                />
+              </div>
+              <div className="col-span-1 flex flex-col">
+                <label className="text-xs font-bold text-gray-400 uppercase italic mb-1 tracking-tight">Period</label>
+                <input
+                  type="text"
+                  readOnly
+                  className="border border-gray-200 rounded px-2 py-1 text-base bg-gray-100 text-gray-500"
+                  defaultValue="01 / 2026"
+                />
+              </div>
+              <div className="col-span-2 flex flex-col">
+                <label className="text-xs font-bold text-gray-400 uppercase italic mb-1 tracking-tight">
+                  Document Type
+                </label>
+                <select className="border border-gray-300 rounded px-2 py-1 text-base outline-none bg-white">
+                  <option>SA - GL Account Document</option>
+                  <option>DZ - Customer Payment</option>
+                </select>
+              </div>
+              <div className="col-span-2 flex flex-col">
+                <label className="text-xs font-bold text-gray-400 uppercase italic mb-1 tracking-tight">
+                  Header Text
+                </label>
+                <textarea
+                  className="border border-gray-300 rounded px-2 py-1 text-base h-16 outline-none focus:border-brand-500"
+                  placeholder="Monthly reconciliation..."
+                ></textarea>
+              </div>
+            </div>
+          </CompactCard>
+
+          <CompactCard title="Operational Controls">
+            <div className="space-y-2">
+              <label className="flex items-center gap-3 p-2 border border-gray-100 rounded hover:bg-gray-50 cursor-pointer transition-colors">
+                <input type="checkbox" className="accent-brand-600 w-4 h-4" defaultChecked />
+                <span className="text-base font-medium">Automatic Tax Calculation</span>
+              </label>
+              <label className="flex items-center gap-3 p-2 border border-gray-100 rounded hover:bg-gray-50 cursor-pointer transition-colors">
+                <input type="checkbox" className="accent-brand-600 w-4 h-4" />
+                <span className="text-base font-medium">Post to All Ledgers</span>
+              </label>
+            </div>
+          </CompactCard>
+        </div>
+
+        {/* ROW 3: COMPLEX DATA TABLE (Center Panel) */}
+        <div className="col-span-12 lg:col-span-8 space-y-3">
+          <CompactCard className="!p-0 overflow-hidden">
+            <div className="bg-gray-50/50 px-4 py-2 border-b border-gray-200 flex justify-between items-center">
+              <SectionTitle>Line Item Entries (001 - 005)</SectionTitle>
+              <div className="flex gap-2 mb-2">
+                <button className="text-[10px] font-bold text-brand-700 bg-brand-50 px-2 py-0.5 rounded border border-brand-100">
+                  ADD ROW
+                </button>
+                <button className="text-[10px] font-bold text-gray-500 bg-white px-2 py-0.5 rounded border border-gray-200">
+                  CLEAR ALL
+                </button>
+              </div>
+            </div>
+            <div className="overflow-x-auto">
+              <table className="w-full border-collapse">
+                <thead>
+                  <tr className="bg-gray-100 border-b border-gray-200">
+                    <th className="px-3 py-1.5 text-[10px] font-bold text-gray-500 uppercase">Item</th>
+                    <th className="px-3 py-1.5 text-[10px] font-bold text-gray-500 uppercase">GL Account</th>
+                    <th className="px-3 py-1.5 text-[10px] font-bold text-gray-500 uppercase">Cost Center</th>
+                    <th className="px-3 py-1.5 text-[10px] font-bold text-gray-500 uppercase text-right">
+                      Amount (LC)
+                    </th>
+                    <th className="px-3 py-1.5 text-[10px] font-bold text-gray-500 uppercase text-center">Ind.</th>
+                    <th className="px-3 py-1.5 text-[10px] font-bold text-gray-500 uppercase text-center">Status</th>
+                  </tr>
+                </thead>
+                <tbody className="divide-y divide-gray-100">
+                  {[10, 20, 30, 40, 50].map((item, idx) => (
+                    <tr key={item} className="hover:bg-brand-50/30 transition-colors group">
+                      <td className="px-3 py-1.5 text-center font-mono text-gray-400">{item}</td>
+                      <td className="px-3 py-1.5">
+                        <div className="font-bold text-brand-700 text-base leading-none">11000{idx}</div>
+                        <div className="text-[10px] text-gray-400 italic">Petty Cash - Main Office</div>
+                      </td>
+                      <td className="px-3 py-1.5">
+                        <div className="font-medium text-gray-700">CC-HEAD-01</div>
+                      </td>
+                      <td className="px-3 py-1.5 text-right font-mono font-bold text-gray-900">
+                        {(item * 1500000).toLocaleString('id-ID')}
+                      </td>
+                      <td className="px-3 py-1.5 text-center font-bold text-brand-600">{idx % 2 === 0 ? 'S' : 'H'}</td>
+                      <td className="px-3 py-1.5 text-center">
+                        <Badge variant={idx === 2 ? 'warning' : 'success'}>{idx === 2 ? 'Review' : 'Valid'}</Badge>
+                      </td>
+                    </tr>
+                  ))}
+                </tbody>
+              </table>
+            </div>
+            <div className="bg-gray-50 p-3 flex justify-end gap-10 border-t border-gray-200">
+              <div className="text-right">
+                <p className="text-[10px] font-bold text-gray-400 uppercase">Total Debit</p>
+                <p className="text-lg font-bold text-gray-900 tracking-tight">IDR 450.000.000</p>
+              </div>
+              <div className="text-right">
+                <p className="text-[10px] font-bold text-gray-400 uppercase">Total Credit</p>
+                <p className="text-lg font-bold text-brand-600 tracking-tight">IDR 450.000.000</p>
+              </div>
+            </div>
+          </CompactCard>
+
+          {/* MESSAGE LOGS / ACTIVITY */}
+          <div className="grid grid-cols-2 gap-3">
+            <CompactCard title="System Activity">
+              <div className="space-y-2">
+                {[
+                  { t: '09:41', u: 'System', m: 'Auto-balancing completed successfully.' },
+                  { t: '10:05', u: 'Admin', m: 'Modified Cost Center on Item 20.' },
+                ].map((log, i) => (
+                  <div key={i} className="text-base flex gap-2 border-b border-gray-50 pb-1">
+                    <span className="font-mono text-brand-600 text-xs">{log.t}</span>
+                    <span className="text-gray-600 leading-tight">
+                      <strong>{log.u}:</strong> {log.m}
+                    </span>
+                  </div>
+                ))}
+              </div>
+            </CompactCard>
+            <CompactCard title="Quick Attachments">
+              <div className="flex flex-wrap gap-2">
+                <div className="border border-dashed border-gray-300 rounded p-2 text-center w-full hover:bg-gray-50 cursor-pointer">
+                  <span className="text-xs font-bold text-gray-400">+ DROP FILES HERE</span>
+                </div>
+                <div className="bg-gray-100 px-2 py-1 rounded text-[11px] font-medium flex items-center gap-2">
+                  📄 invoice_001.pdf <span className="text-red-500 font-bold cursor-pointer">×</span>
+                </div>
+              </div>
+            </CompactCard>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}

packages/ui/src/components/index.ts

@@ -1,5 +1,14 @@
-export * from './header';
-export * from './counter';
-export * from './date-example';
-export * from './encryption-demo';
-export * from './button';
+export * from './examples/header-example';
+export * from './examples/counter-example';
+export * from './examples/date-example';
+export * from './examples/encryption-example';
+export * from './examples/style-guide-1';
+export * from './examples/style-guide-2';
+export * from './examples/style-guide-3';
+
+export * from './system-pages/coming-soon';
+export * from './system-pages/forbidden';
+export * from './system-pages/maintenance';
+export * from './system-pages/not-found';
+
+export * from './button/button';

packages/ui/src/components/system-pages/coming-soon.tsx

@@ -0,0 +1,25 @@
+export function ComingSoon() {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-white px-4">
+      <div className="w-full max-w-md text-center">
+        {/* Code */}
+        <p className="text-sm font-medium uppercase tracking-widest text-gray-400">Coming Soon</p>
+
+        {/* Title */}
+        <h1 className="mt-3 text-6xl font-extrabold text-gray-900">Feature in Progress</h1>
+
+        {/* Description */}
+        <p className="mt-4 text-base text-gray-500">
+          This feature is currently under development. Stay tuned! We'll have it ready for you very soon.
+        </p>
+
+        {/* Actions */}
+        <div className="mt-8 flex justify-center gap-3">
+          <a href="/" className="rounded-md bg-gray-900 px-5 py-2.5 text-sm font-medium text-white hover:bg-gray-800">
+            Back to Home
+          </a>
+        </div>
+      </div>
+    </div>
+  );
+}

packages/ui/src/components/system-pages/forbidden.tsx

@@ -0,0 +1,33 @@
+export function Forbidden() {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-white px-4">
+      <div className="w-full max-w-md text-center">
+        {/* Code */}
+        <p className="text-sm font-medium uppercase tracking-widest text-gray-400">403 Error</p>
+
+        {/* Title */}
+        <h1 className="mt-3 text-6xl font-extrabold text-gray-900">Access Denied</h1>
+
+        {/* Description */}
+        <p className="mt-4 text-base text-gray-500">
+          Sorry, you don’t have permission to access this page. Please contact your administrator if you believe this is
+          a mistake.
+        </p>
+
+        {/* Actions */}
+        <div className="mt-8 flex justify-center gap-3">
+          <button
+            onClick={() => window.history.back()}
+            className="rounded-md border border-gray-300 px-5 py-2.5 text-sm font-medium text-gray-700 hover:bg-gray-100"
+          >
+            Go Back
+          </button>
+
+          <a href="/" className="rounded-md bg-gray-900 px-5 py-2.5 text-sm font-medium text-white hover:bg-gray-800">
+            Back to Home
+          </a>
+        </div>
+      </div>
+    </div>
+  );
+}

packages/ui/src/components/system-pages/maintenance.tsx

@@ -0,0 +1,26 @@
+export function Maintenance() {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-white px-4">
+      <div className="w-full max-w-md text-center">
+        {/* Code */}
+        <p className="text-sm font-medium uppercase tracking-widest text-gray-400">Maintenance</p>
+
+        {/* Title */}
+        <h1 className="mt-3 text-6xl font-extrabold text-gray-900">We'll Be Back Soon</h1>
+
+        {/* Description */}
+        <p className="mt-4 text-base text-gray-500">
+          Our system is currently undergoing scheduled maintenance. We are working hard to bring it back online as soon
+          as possible.
+        </p>
+
+        {/* Optional Actions */}
+        <div className="mt-8 flex justify-center gap-3">
+          <a href="/" className="rounded-md bg-gray-900 px-5 py-2.5 text-sm font-medium text-white hover:bg-gray-800">
+            Back to Home
+          </a>
+        </div>
+      </div>
+    </div>
+  );
+}

packages/ui/src/components/system-pages/not-found.tsx

@@ -0,0 +1,28 @@
+export function NotFound() {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-white px-4">
+      <div className="w-full max-w-md text-center">
+        <p className="text-sm font-medium uppercase tracking-widest text-gray-400">404 Error</p>
+
+        <h1 className="mt-3 text-6xl font-extrabold text-gray-900">Page Not Found</h1>
+
+        <p className="mt-4 text-base text-gray-500">
+          Sorry, the page you’re looking for doesn’t exist or has been moved.
+        </p>
+
+        <div className="mt-8 flex justify-center gap-3">
+          <button
+            onClick={() => window.history.back()}
+            className="rounded-md border border-gray-300 px-5 py-2.5 text-sm font-medium text-gray-700 hover:bg-gray-100"
+          >
+            Go Back
+          </button>
+
+          <a href="/" className="rounded-md bg-gray-900 px-5 py-2.5 text-sm font-medium text-white hover:bg-gray-800">
+            Back to Home
+          </a>
+        </div>
+      </div>
+    </div>
+  );
+}