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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Notification Manager</title>
+    
+    <!-- React & ReactDOM -->
+    <script crossorigin src="https://unpkg.com/react@18/umd/react.development.js"></script>
+    <script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.development.js"></script>
+    
+    <!-- Babel for JSX -->
+    <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
+    
+    <!-- Tailwind CSS -->
+    <script src="https://cdn.tailwindcss.com"></script>
+    
+    <!-- Lucide Icons -->
+    <script src="https://unpkg.com/lucide@latest"></script>
+
+    <style>
+        /* Custom Scrollbar for cleaner look */
+        ::-webkit-scrollbar {
+            width: 8px;
+            height: 8px;
+        }
+        ::-webkit-scrollbar-track {
+            background: #f1f5f9; 
+        }
+        ::-webkit-scrollbar-thumb {
+            background: #cbd5e1; 
+            border-radius: 4px;
+        }
+        ::-webkit-scrollbar-thumb:hover {
+            background: #94a3b8; 
+        }
+        
+        .toggle-checkbox:checked {
+            right: 0;
+            border-color: #68D391;
+        }
+        .toggle-checkbox:checked + .toggle-label {
+            background-color: #68D391;
+        }
+        
+        /* Smooth height transition for accordion */
+        .accordion-content {
+            transition: max-height 0.3s ease-in-out, opacity 0.3s ease-in-out;
+            max-height: 0;
+            opacity: 0;
+            overflow: hidden;
+        }
+        .accordion-content.expanded {
+            max-height: 1000px; /* Arbitrary large height */
+            opacity: 1;
+        }
+    </style>
+</head>
+<body class="bg-slate-50 text-slate-800 font-sans antialiased">
+    <div id="root"></div>
+
+    <script type="text/babel">
+        const { useState, useEffect, useMemo } = React;
+
+        // --- Icons ---
+        const Icon = ({ name, size = 18, className }) => {
+            const LucideIcon = window.lucide && window.lucide.icons ? window.lucide.icons[name] : null;
+            if (!LucideIcon) return null;
+            
+            return (
+                <i data-lucide={name} className={className} style={{ width: size, height: size, display: 'inline-block' }}></i>
+            );
+        };
+
+        // --- Mock Data ---
+        const INITIAL_TOKENS = [
+            { id: 't1', name: 'Personal OV-chipkaart (**** 9021)', type: 'Personal' },
+            { id: 't2', name: 'NS Business Card (**** 3321)', type: 'Business' },
+            { id: 't3', name: 'Anonymous Travel Card (**** 1100)', type: 'Anonymous' }
+        ];
+
+        const INITIAL_DATA_TEMPLATE = [
+            {
+                id: 'cat_trips',
+                name: 'My Trips',
+                description: 'Notifications related to your travel history and active journeys.',
+                enabled: true,
+                channels: { app: true, email: false },
+                events: [
+                    { id: 'evt_in', name: 'Tap In', description: 'When you start a journey', enabled: true, channels: { app: true, email: false } },
+                    { id: 'evt_out', name: 'Tap Out', description: 'When you end a journey', enabled: true, channels: { app: true, email: false } },
+                    // SHARED EVENT TYPE: evt_miss_out
+                    { id: 'evt_miss_out', name: 'Missing Tap Out', description: 'Alert when you forget to check out', enabled: true, channels: { app: true, email: true } },
+                    { id: 'evt_recalc', name: 'Trip Recalculated', description: 'Price corrections', enabled: true, channels: { app: true, email: true } },
+                ]
+            },
+            {
+                id: 'cat_service',
+                name: 'My Service Messages',
+                description: 'Bundled events regarding service and account status.',
+                enabled: true,
+                channels: { app: true, email: true },
+                events: [
+                    // SHARED EVENT TYPE: evt_miss_out (Same ID as in My Trips)
+                    { id: 'evt_miss_out', name: 'Missing Tap Out', description: 'Alert when you forget to check out', enabled: true, channels: { app: true, email: true } },
+                    { id: 'evt_refund', name: 'Refund Processed', description: 'Updates on your refund requests', enabled: true, channels: { app: true, email: true } },
+                ]
+            },
+            {
+                id: 'cat_products',
+                name: 'My Products',
+                description: 'Updates about your subscriptions and card validity.',
+                enabled: false,
+                channels: { app: true, email: true },
+                events: [
+                    { id: 'evt_sub_renew', name: 'Subscription Renewal', description: 'Monthly renewal alerts', enabled: true, channels: { app: true, email: true } },
+                    { id: 'evt_card_exp', name: 'Card Expiry', description: 'Warning before card expires', enabled: true, channels: { app: false, email: true } },
+                ]
+            },
+            {
+                id: 'cat_disruptions',
+                name: 'Disruptions',
+                description: 'Real-time alerts about delays on your favorite routes.',
+                enabled: true,
+                channels: { app: true, email: false },
+                events: [
+                    { id: 'evt_delay', name: 'Delays > 15min', description: 'Significant delays', enabled: true, channels: { app: true, email: false } },
+                    { id: 'evt_cancelled', name: 'Train Cancelled', description: 'Cancellations on route', enabled: true, channels: { app: true, email: false } },
+                    { id: 'evt_maintenance', name: 'Planned Maintenance', description: 'Future work alerts', enabled: false, channels: { app: false, email: true } },
+                ]
+            }
+        ];
+
+        // Helper to deep copy mock data so state is independent per token
+        const generateMockState = () => {
+            const state = {};
+            INITIAL_TOKENS.forEach(t => {
+                state[t.id] = JSON.parse(JSON.stringify(INITIAL_DATA_TEMPLATE));
+            });
+            return state;
+        };
+
+        // --- Components ---
+
+        const ToggleSwitch = ({ checked, onChange, disabled }) => (
+            <div className={`relative inline-block w-10 mr-2 align-middle select-none transition duration-200 ease-in ${disabled ? 'opacity-50 cursor-not-allowed' : ''}`}>
+                <input 
+                    type="checkbox" 
+                    name="toggle" 
+                    id={Math.random().toString(36).substring(7)} 
+                    className={`toggle-checkbox absolute block w-5 h-5 rounded-full bg-white border-4 appearance-none cursor-pointer transition-all duration-300 ${checked ? 'right-0 border-green-500' : 'left-0 border-gray-300'}`} 
+                    checked={checked} 
+                    onChange={(e) => !disabled && onChange(e.target.checked)}
+                    disabled={disabled}
+                />
+                <label 
+                    className={`toggle-label block overflow-hidden h-5 rounded-full cursor-pointer transition-colors duration-300 ${checked ? 'bg-green-500' : 'bg-gray-300'}`}
+                ></label>
+            </div>
+        );
+
+        const Checkbox = ({ checked, onChange, label, disabled }) => (
+            <label className={`inline-flex items-center space-x-2 cursor-pointer ${disabled ? 'opacity-40 cursor-not-allowed' : ''}`}>
+                <div className={`w-5 h-5 flex items-center justify-center border rounded transition-colors ${checked ? 'bg-blue-600 border-blue-600' : 'bg-white border-slate-300 hover:border-blue-400'}`}>
+                    {checked && (
+                        <svg className="w-3 h-3 text-white fill-current" viewBox="0 0 20 20">
+                            <path d="M0 11l2-2 5 5L18 3l2 2L7 18z"/>
+                        </svg>
+                    )}
+                </div>
+                <input 
+                    type="checkbox" 
+                    className="hidden" 
+                    checked={checked} 
+                    onChange={(e) => !disabled && onChange(e.target.checked)}
+                    disabled={disabled}
+                />
+                <span className="text-sm font-medium text-slate-600">{label}</span>
+            </label>
+        );
+
+        const TokenSelector = ({ tokens, selectedId, onSelect }) => {
+            const selectedToken = tokens.find(t => t.id === selectedId);
+            const [isOpen, setIsOpen] = useState(false);
+
+            return (
+                <div className="relative mb-8 z-20">
+                    <label className="block text-sm font-semibold text-slate-500 mb-2 uppercase tracking-wide">Select Travel Card</label>
+                    <button 
+                        onClick={() => setIsOpen(!isOpen)}
+                        className="w-full md:w-96 flex items-center justify-between bg-white border border-slate-200 hover:border-blue-400 px-4 py-3 rounded-xl shadow-sm transition-all text-left"
+                    >
+                        <div className="flex items-center gap-3">
+                            <div className="bg-blue-100 p-2 rounded-full text-blue-600">
+                                <i data-lucide="credit-card"></i>
+                            </div>
+                            <div>
+                                <div className="font-bold text-slate-800">{selectedToken?.name}</div>
+                                <div className="text-xs text-slate-500">{selectedToken?.type}</div>
+                            </div>
+                        </div>
+                        <i data-lucide="chevron-down" className={`text-slate-400 transition-transform ${isOpen ? 'rotate-180' : ''}`}></i>
+                    </button>
+
+                    {isOpen && (
+                        <div className="absolute top-full mt-2 w-full md:w-96 bg-white border border-slate-100 rounded-xl shadow-xl overflow-hidden animate-fade-in-down">
+                            {tokens.map(token => (
+                                <div 
+                                    key={token.id}
+                                    onClick={() => { onSelect(token.id); setIsOpen(false); }}
+                                    className={`px-4 py-3 cursor-pointer hover:bg-slate-50 flex items-center gap-3 border-b border-slate-50 last:border-0 ${token.id === selectedId ? 'bg-blue-50/50' : ''}`}
+                                >
+                                    <div className={`w-2 h-2 rounded-full ${token.id === selectedId ? 'bg-blue-500' : 'bg-slate-300'}`}></div>
+                                    <div className="text-sm font-medium text-slate-700">{token.name}</div>
+                                </div>
+                            ))}
+                        </div>
+                    )}
+                </div>
+            );
+        };
+
+        const NotificationMatrix = ({ data, onUpdate }) => {
+            const [expandedCategories, setExpandedCategories] = useState({});
+
+            const toggleExpand = (catId) => {
+                setExpandedCategories(prev => ({
+                    ...prev,
+                    [catId]: !prev[catId]
+                }));
+            };
+
+            // --- Handlers ---
+
+            // Level 2: Toggle Category Enable/Disable
+            // COMPLEXITY UPDATE: If category is toggled, it gathers the Event IDs inside it.
+            // It then updates ALL categories, syncing the enabled state for those shared Event IDs globally.
+            const handleCategoryToggle = (catId, newValue) => {
+                // 1. Identify which events are being affected by this category change
+                const targetCat = data.find(c => c.id === catId);
+                const targetEventIds = new Set(targetCat.events.map(e => e.id));
+
+                // 2. Map over all data to apply changes everywhere those events exist
+                const updatedData = data.map(cat => {
+                    // Update the category itself if it is the target
+                    const newCatEnabled = cat.id === catId ? newValue : cat.enabled;
+
+                    // Update events if they match the IDs from the toggled category
+                    const updatedEvents = cat.events.map(evt => {
+                        if (targetEventIds.has(evt.id)) {
+                            return { ...evt, enabled: newValue };
+                        }
+                        return evt;
+                    });
+
+                    return { ...cat, enabled: newCatEnabled, events: updatedEvents };
+                });
+                onUpdate(updatedData);
+            };
+
+            // Level 4: Toggle Category Channel (App/Email)
+            // COMPLEXITY UPDATE: Propagates channel settings to shared events globally.
+            const handleCategoryChannelToggle = (catId, channelKey, newValue) => {
+                const targetCat = data.find(c => c.id === catId);
+                const targetEventIds = new Set(targetCat.events.map(e => e.id));
+
+                const updatedData = data.map(cat => {
+                    // Update parent channel state only for the clicked category
+                    const updatedChannels = cat.id === catId
+                        ? { ...cat.channels, [channelKey]: newValue }
+                        : cat.channels;
+
+                    // Update events globally if they match the IDs
+                    const updatedEvents = cat.events.map(evt => {
+                        if (targetEventIds.has(evt.id)) {
+                            return {
+                                ...evt,
+                                channels: { ...evt.channels, [channelKey]: newValue }
+                            };
+                        }
+                        return evt;
+                    });
+
+                    return { ...cat, channels: updatedChannels, events: updatedEvents };
+                });
+                onUpdate(updatedData);
+            };
+
+            // Level 3: Toggle Event Enable/Disable
+            // COMPLEXITY UPDATE: Scans ALL categories for the matching evtId and updates them.
+            const handleEventToggle = (catId, evtId, newValue) => {
+                const updatedData = data.map(cat => {
+                    // We remove the `if (cat.id !== catId)` check to allow global updates
+                    const updatedEvents = cat.events.map(evt => 
+                        evt.id === evtId ? { ...evt, enabled: newValue } : evt
+                    );
+                    return { ...cat, events: updatedEvents };
+                });
+                onUpdate(updatedData);
+            };
+
+            // Level 5: Toggle Event Channel (Deviation)
+            // COMPLEXITY UPDATE: Scans ALL categories for the matching evtId and updates channels.
+            const handleEventChannelToggle = (catId, evtId, channelKey, newValue) => {
+                const updatedData = data.map(cat => {
+                    const updatedEvents = cat.events.map(evt => 
+                        evt.id === evtId ? { 
+                            ...evt, 
+                            channels: { ...evt.channels, [channelKey]: newValue } 
+                        } : evt
+                    );
+                    return { ...cat, events: updatedEvents };
+                });
+                onUpdate(updatedData);
+            };
+
+            return (
+                <div className="bg-white rounded-2xl shadow-sm border border-slate-200 overflow-hidden">
+                    {/* Header */}
+                    <div className="grid grid-cols-12 gap-4 p-4 bg-slate-100 border-b border-slate-200 text-xs font-bold text-slate-500 uppercase tracking-wider">
+                        <div className="col-span-6 md:col-span-5 pl-2">Category / Event</div>
+                        <div className="col-span-2 text-center">Status</div>
+                        <div className="col-span-4 md:col-span-5 flex justify-around">
+                            <span>App Push</span>
+                            <span>Email</span>
+                        </div>
+                    </div>
+
+                    {/* Body */}
+                    <div className="divide-y divide-slate-100">
+                        {data.map(cat => {
+                            const isExpanded = !!expandedCategories[cat.id];
+                            
+                            return (
+                                <div key={cat.id} className="group">
+                                    {/* Category Row (Level 2 & 4) */}
+                                    <div className={`grid grid-cols-12 gap-4 p-4 items-center transition-colors hover:bg-slate-50 ${isExpanded ? 'bg-slate-50/80' : ''}`}>
+                                        
+                                        {/* Name & Expander */}
+                                        <div className="col-span-6 md:col-span-5 flex items-center gap-3">
+                                            <button 
+                                                onClick={() => toggleExpand(cat.id)}
+                                                className="p-1 rounded hover:bg-slate-200 text-slate-400 hover:text-slate-600 transition-colors"
+                                            >
+                                                <i data-lucide={isExpanded ? "chevron-down" : "chevron-right"} className="w-5 h-5"></i>
+                                            </button>
+                                            <div className="flex flex-col">
+                                                <span className="font-bold text-slate-800 text-base">{cat.name}</span>
+                                                <span className="text-xs text-slate-500 hidden md:block">{cat.description}</span>
+                                            </div>
+                                        </div>
+
+                                        {/* Master Toggle (Level 2) */}
+                                        <div className="col-span-2 flex justify-center">
+                                            <ToggleSwitch 
+                                                checked={cat.enabled} 
+                                                onChange={(val) => handleCategoryToggle(cat.id, val)} 
+                                            />
+                                        </div>
+
+                                        {/* Channels (Level 4) */}
+                                        <div className="col-span-4 md:col-span-5 flex justify-around items-center">
+                                            <Checkbox 
+                                                checked={cat.channels.app} 
+                                                onChange={(val) => handleCategoryChannelToggle(cat.id, 'app', val)}
+                                                disabled={!cat.enabled}
+                                                label=""
+                                            />
+                                            <Checkbox 
+                                                checked={cat.channels.email} 
+                                                onChange={(val) => handleCategoryChannelToggle(cat.id, 'email', val)}
+                                                disabled={!cat.enabled}
+                                                label=""
+                                            />
+                                        </div>
+                                    </div>
+
+                                    {/* Event Rows (Level 3 & 5) - Accordion Body */}
+                                    <div className={`accordion-content bg-slate-50/50 ${isExpanded ? 'expanded' : ''}`}>
+                                        <div className="pl-0 md:pl-0 border-t border-slate-100/50">
+                                            {cat.events.map((evt, idx) => (
+                                                <div key={evt.id} className={`grid grid-cols-12 gap-4 py-3 px-4 items-center border-b border-slate-100 last:border-0 ${!cat.enabled ? 'opacity-40 pointer-events-none' : ''}`}>
+                                                    
+                                                    {/* Event Name */}
+                                                    <div className="col-span-6 md:col-span-5 pl-12 flex flex-col justify-center relative">
+                                                        {/* Connector Line Visualization */}
+                                                        <div className="absolute left-6 top-0 bottom-1/2 w-px bg-slate-200 -z-10 h-full"></div>
+                                                        <div className="absolute left-6 top-1/2 w-4 h-px bg-slate-200 -z-10"></div>
+                                                        
+                                                        <span className="text-sm font-medium text-slate-700">{evt.name}</span>
+                                                        <span className="text-[10px] text-slate-400 md:hidden">{evt.description}</span>
+                                                    </div>
+
+                                                    {/* Event Toggle (Level 3) */}
+                                                    <div className="col-span-2 flex justify-center">
+                                                        <ToggleSwitch 
+                                                            checked={evt.enabled} 
+                                                            onChange={(val) => handleEventToggle(cat.id, evt.id, val)}
+                                                            disabled={!cat.enabled}
+                                                        />
+                                                    </div>
+
+                                                    {/* Event Channels (Level 5) */}
+                                                    <div className="col-span-4 md:col-span-5 flex justify-around items-center">
+                                                        <Checkbox 
+                                                            checked={evt.channels.app} 
+                                                            onChange={(val) => handleEventChannelToggle(cat.id, evt.id, 'app', val)}
+                                                            disabled={!cat.enabled || !evt.enabled} 
+                                                            label=""
+                                                        />
+                                                        <Checkbox 
+                                                            checked={evt.channels.email} 
+                                                            onChange={(val) => handleEventChannelToggle(cat.id, evt.id, 'email', val)}
+                                                            disabled={!cat.enabled || !evt.enabled}
+                                                            label=""
+                                                        />
+                                                    </div>
+                                                </div>
+                                            ))}
+                                        </div>
+                                    </div>
+                                </div>
+                            );
+                        })}
+                    </div>
+                </div>
+            );
+        };
+
+        const App = () => {
+            const [selectedTokenId, setSelectedTokenId] = useState('t1');
+            const [settings, setSettings] = useState(generateMockState());
+
+            // Initialize icons on mount and update
+            useEffect(() => {
+                if (window.lucide) {
+                    window.lucide.createIcons();
+                }
+            });
+
+            const currentData = settings[selectedTokenId];
+
+            const handleUpdate = (newData) => {
+                setSettings(prev => ({
+                    ...prev,
+                    [selectedTokenId]: newData
+                }));
+            };
+
+            return (
+                <div className="min-h-screen p-4 md:p-8 max-w-5xl mx-auto">
+                    {/* Header */}
+                    <div className="mb-8">
+                        <h1 className="text-3xl font-bold text-slate-800 mb-2">Manage Notifications</h1>
+                        <p className="text-slate-500">Fine-tune your communication preferences per travel card.</p>
+                    </div>
+
+                    {/* Level 1: Token Selection */}
+                    <TokenSelector 
+                        tokens={INITIAL_TOKENS} 
+                        selectedId={selectedTokenId} 
+                        onSelect={setSelectedTokenId} 
+                    />
+
+                    {/* Notification Matrix */}
+                    <NotificationMatrix 
+                        data={currentData} 
+                        onUpdate={handleUpdate} 
+                    />
+
+                    {/* Footer / Hint */}
+                    <div className="mt-8 text-center text-xs text-slate-400">
+                        <p>Changes are saved automatically.</p>
+                        <p>Disabling a category will suppress all notifications within it.</p>
+                        <p className="mt-1 font-semibold text-blue-500">Note: Identical events (e.g. "Missing Tap Out") are synchronized across categories.</p>
+                    </div>
+                </div>
+            );
+        };
+
+        const root = ReactDOM.createRoot(document.getElementById('root'));
+        root.render(<App />);
+    </script>
+</body>
+</html>
\ No newline at end of file
