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<!DOCTYPE html>
<html lang="it">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Generatore Fatture - Sistema Intelligente</title>
    <link rel="stylesheet" href="style.css">
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js"></script>
</head>
<body>
    <!-- Toast Notification Area -->
    <div id="toast-container"></div>

    <!-- Setup Modal -->
    <div id="setupModal" class="modal hidden">
        <div class="modal-content">
            <div class="modal-header">
                <h3>Configurazione Iniziale</h3>
                <div class="setup-steps">
                    <span class="step-indicator step-1 active">1</span>
                    <span class="step-indicator step-2">2</span>
                    <span class="step-indicator step-3">3</span>
                </div>
            </div>
            <div class="modal-body">
                <!-- Step 1: User Info -->
                <div id="setupStep1" class="setup-step active">
                    <h4>Informazioni Utente</h4>
                    <div class="form-group">
                        <label class="form-label" for="username">Nome Utente:</label>
                        <input type="text" id="username" class="form-control" placeholder="Inserisci il tuo nome utente" required>
                    </div>
                    <div class="form-actions">
                        <button type="button" id="nextStep1" class="btn btn--primary">Continua →</button>
                    </div>
                </div>

                <!-- Step 2: Doctor Info -->
                <div id="setupStep2" class="setup-step hidden">
                    <h4>Informazioni Medico</h4>
                    <div class="form-group">
                        <label class="form-label" for="doctorName">Nome Medico:</label>
                        <input type="text" id="doctorName" class="form-control" required>
                    </div>
                    <div class="form-group">
                        <label class="form-label" for="doctorAddress">Indirizzo:</label>
                        <input type="text" id="doctorAddress" class="form-control" required>
                    </div>
                    <div class="form-group">
                        <label class="form-label" for="doctorPiva">P.IVA:</label>
                        <input type="text" id="doctorPiva" class="form-control" required>
                    </div>
                    <div class="form-group">
                        <label class="form-label" for="doctorCf">Codice Fiscale:</label>
                        <input type="text" id="doctorCf" class="form-control" required>
                    </div>
                    <div class="form-group">
                        <label class="form-label" for="doctorTitle">Titolo Professionale:</label>
                        <input type="text" id="doctorTitle" class="form-control" required>
                    </div>
                    <div class="form-group">
                        <label class="form-label" for="doctorOrder">Ordine Medici:</label>
                        <input type="text" id="doctorOrder" class="form-control" required>
                    </div>
                    <div class="form-actions">
                        <button type="button" id="prevStep2" class="btn btn--outline">← Indietro</button>
                        <button type="button" id="nextStep2" class="btn btn--primary">Continua →</button>
                    </div>
                </div>

                <!-- Step 3: Folder Selection -->
                <div id="setupStep3" class="setup-step hidden">
                    <h4>Cartella di Salvataggio</h4>
                    <div class="folder-selection-info">
                        <div class="info-icon">?</div>
                        <div class="info-content">
                            <p><strong>Importante:</strong> Seleziona una cartella dove salvare tutti i tuoi dati delle fatture.</p>
                            <p>I file verranno salvati automaticamente con timestamp e saranno accessibili solo a te.</p>
                            <p>Esempio: <code>Documenti/Fatture</code></p>
                        </div>
                    </div>
                    
                    <div class="folder-selection">
                        <div id="folderStatus" class="folder-status">
                            <span class="folder-icon">?</span>
                            <span id="folderPath" class="folder-path">Nessuna cartella selezionata</span>
                        </div>
                        
                        <button type="button" id="selectFolderBtn" class="btn btn--secondary btn--full-width">
                            ?️ Seleziona Cartella di Salvataggio
                        </button>
                        
                        <div id="folderNotSupported" class="folder-fallback hidden">
                            <p class="warning-text">⚠️ Il tuo browser non supporta la selezione diretta delle cartelle.</p>
                            <p>Utilizzeremo il sistema di download/upload tradizionale come fallback.</p>
                        </div>
                    </div>
                    
                    <div class="form-actions">
                        <button type="button" id="prevStep3" class="btn btn--outline">← Indietro</button>
                        <button type="button" id="completeSetup" class="btn btn--primary" disabled>Completa Configurazione</button>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <!-- Header -->
    <header class="header">
        <div class="container">
            <div class="header-content">
                <h1>Generatore Fatture</h1>
                <div class="header-info">
                    <span id="currentUser" class="user-badge"></span>
                    <div id="saveStatus" class="save-status">
                        <span id="saveIndicator" class="save-indicator">?</span>
                        <span id="saveText" class="save-text">Salvato</span>
                    </div>
                    <span id="versionInfo" class="version-badge"></span>
                    <button id="settingsBtn" class="btn btn--outline btn--sm">⚙️</button>
                    <button id="logoutBtn" class="btn btn--outline btn--sm">Logout</button>
                </div>
            </div>
        </div>
    </header>

    <!-- Storage Info Banner -->
    <div id="storageInfo" class="storage-info hidden">
        <div class="container">
            <div class="storage-content">
                <span class="storage-icon">?</span>
                <span id="storageText" class="storage-text"></span>
                <button id="changeFolder" class="btn btn--outline btn--sm">Cambia Cartella</button>
            </div>
        </div>
    </div>

    <!-- Navigation -->
    <nav class="nav-tabs">
        <div class="container">
            <button id="generatorTab" class="nav-tab active">Generatore</button>
            <button id="managementTab" class="nav-tab">Gestione</button>
        </div>
    </nav>

    <!-- Main Content -->
    <main class="main-content">
        <div class="container">
            <!-- Loading Screen -->
            <div id="loadingScreen" class="loading-screen hidden">
                <div class="loading-content">
                    <div class="loading-spinner"></div>
                    <h3>Caricamento dati...</h3>
                    <p id="loadingText">Scansione cartella in corso...</p>
                </div>
            </div>

            <!-- Import/Export Section -->
            <section class="import-export-section">
                <div class="card">
                    <div class="card__body">
                        <div class="import-export-controls">
                            <div class="export-section">
                                <button id="exportBtn" class="btn btn--primary">
                                    ? Esporta Copia Extra
                                </button>
                                <small class="export-info">Crea una copia aggiuntiva in Downloads</small>
                            </div>
                            
                            <div class="import-section">
                                <div id="dropZone" class="drop-zone">
                                    <div class="drop-zone-content">
                                        <span class="drop-icon">?</span>
                                        <p>Importa da file esterno</p>
                                        <button id="importBtn" class="btn btn--secondary">Seleziona File</button>
                                        <small>Solo per backup esterni</small>
                                    </div>
                                </div>
                                <input type="file" id="fileInput" accept=".json" class="hidden">
                            </div>
                        </div>
                    </div>
                </div>
            </section>

            <!-- Generator Page -->
            <div id="generatorPage" class="page-content">
                <!-- Patient Selection -->
                <section class="patient-section">
                    <div class="card">
                        <div class="card__header">
                            <h3>Selezione Paziente</h3>
                        </div>
                        <div class="card__body">
                            <div class="patient-controls">
                                <select id="patientSelect" class="form-control">
                                    <option value="">Seleziona un paziente...</option>
                                </select>
                                <button id="addPatientBtn" class="btn btn--secondary">+ Nuovo Paziente</button>
                            </div>
                            
                            <div id="selectedPatientInfo" class="patient-info hidden">
                                <h4>Informazioni Paziente:</h4>
                                <div id="patientDetails"></div>
                            </div>
                        </div>
                    </div>
                </section>

                <!-- Invoice Generation -->
                <section class="invoice-section">
                    <div class="card">
                        <div class="card__header">
                            <h3>Generazione Fattura</h3>
                        </div>
                        <div class="card__body">
                            <form id="invoiceForm">
                                <div class="form-row">
                                    <div class="form-group">
                                        <label class="form-label" for="invoiceDate">Data Fattura:</label>
                                        <input type="date" id="invoiceDate" class="form-control" required>
                                    </div>
                                    <div class="form-group">
                                        <label class="form-label" for="invoiceNumber">Numero:</label>
                                        <input type="text" id="invoiceNumber" class="form-control" readonly>
                                    </div>
                                </div>
                                
                                <div id="servicesContainer">
                                    <div class="service-item">
                                        <div class="form-row">
                                            <div class="form-group flex-1">
                                                <label class="form-label">Descrizione:</label>
                                                <input type="text" class="form-control service-description" placeholder="Visita medica" required>
                                            </div>
                                            <div class="form-group">
                                                <label class="form-label">Quantità:</label>
                                                <input type="number" class="form-control service-quantity" min="1" value="1" required>
                                            </div>
                                            <div class="form-group">
                                                <label class="form-label">Prezzo (€):</label>
                                                <input type="number" class="form-control service-price" step="0.01" min="0" required>
                                            </div>
                                            <div class="form-group">
                                                <button type="button" class="btn btn--outline btn--sm remove-service" disabled>Rimuovi</button>
                                            </div>
                                        </div>
                                    </div>
                                </div>
                                
                                <button type="button" id="addServiceBtn" class="btn btn--secondary btn--sm">+ Aggiungi Servizio</button>
                                
                                <div class="invoice-total">
                                    <strong>Totale: € <span id="totalAmount">0.00</span></strong>
                                </div>
                                
                                <div class="form-actions">
                                    <button type="submit" class="btn btn--primary">Genera PDF</button>
                                    <button type="button" id="printBtn" class="btn btn--outline">Stampa</button>
                                </div>
                            </form>
                        </div>
                    </div>
                </section>
            </div>

            <!-- Management Page -->
            <div id="managementPage" class="page-content hidden">
                <!-- Patients Management -->
                <section class="patients-management">
                    <div class="card">
                        <div class="card__header">
                            <h3>Gestione Pazienti</h3>
                            <button id="addNewPatientBtn" class="btn btn--primary">+ Nuovo Paziente</button>
                        </div>
                        <div class="card__body">
                            <div id="patientsTable"></div>
                        </div>
                    </div>
                </section>

                <!-- Invoices Management -->
                <section class="invoices-management">
                    <div class="card">
                        <div class="card__header">
                            <h3>Gestione Fatture</h3>
                        </div>
                        <div class="card__body">
                            <div id="invoicesTable"></div>
                        </div>
                    </div>
                </section>

                <!-- Statistics -->
                <section class="statistics">
                    <div class="card">
                        <div class="card__header">
                            <h3>Statistiche</h3>
                        </div>
                        <div class="card__body">
                            <div class="stats-grid">
                                <div class="stat-item">
                                    <span class="stat-label">Totale Pazienti:</span>
                                    <span id="totalPatients" class="stat-value">0</span>
                                </div>
                                <div class="stat-item">
                                    <span class="stat-label">Totale Fatture:</span>
                                    <span id="totalInvoices" class="stat-value">0</span>
                                </div>
                                <div class="stat-item">
                                    <span class="stat-label">Fatturato Anno:</span>
                                    <span id="yearlyRevenue" class="stat-value">€ 0.00</span>
                                </div>
                                <div class="stat-item">
                                    <span class="stat-label">File Corrente:</span>
                                    <span id="currentFileName" class="stat-value">-</span>
                                </div>
                            </div>
                        </div>
                    </div>
                </section>
            </div>
        </div>
    </main>

    <!-- Patient Modal -->
    <div id="patientModal" class="modal hidden">
        <div class="modal-content">
            <div class="modal-header">
                <h3 id="patientModalTitle">Nuovo Paziente</h3>
                <button id="closePatientModal" class="btn btn--outline btn--sm">✕</button>
            </div>
            <div class="modal-body">
                <form id="patientForm">
                    <div class="form-group">
                        <label class="form-label" for="patientTitle">Titolo:</label>
                        <select id="patientTitle" class="form-control" required>
                            <option value="Signore">Signore</option>
                            <option value="Signora">Signora</option>
                            <option value="Signorina">Signorina</option>
                            <option value="Dott.">Dott.</option>
                            <option value="Dott.ssa">Dott.ssa</option>
                        </select>
                    </div>
                    <div class="form-group">
                        <label class="form-label" for="patientName">Nome Completo:</label>
                        <input type="text" id="patientName" class="form-control" required>
                    </div>
                    <div class="form-group">
                        <label class="form-label" for="patientAddress">Indirizzo:</label>
                        <input type="text" id="patientAddress" class="form-control" required>
                    </div>
                    <div class="form-group">
                        <label class="form-label" for="patientTaxCode">Codice Fiscale:</label>
                        <input type="text" id="patientTaxCode" class="form-control" required>
                    </div>
                    <div class="form-actions">
                        <button type="submit" class="btn btn--primary">Salva Paziente</button>
                        <button type="button" id="cancelPatientBtn" class="btn btn--outline">Annulla</button>
                    </div>
                </form>
            </div>
        </div>
    </div>

    <!-- Settings Modal -->
    <div id="settingsModal" class="modal hidden">
        <div class="modal-content">
            <div class="modal-header">
                <h3>Impostazioni</h3>
                <button id="closeSettingsModal" class="btn btn--outline btn--sm">✕</button>
            </div>
            <div class="modal-body">
                <div class="settings-section">
                    <h4>Cartella di Salvataggio</h4>
                    <div class="current-folder">
                        <p><strong>Cartella attuale:</strong></p>
                        <div id="currentFolderPath" class="folder-display">-</div>
                    </div>
                    <button id="changeFolderBtn" class="btn btn--secondary">
                        ?️ Cambia Cartella
                    </button>
                </div>
                <div class="settings-section">
                    <h4>File di Backup</h4>
                    <p>File salvati automaticamente: <strong id="backupCount">-</strong></p>
                    <button id="cleanupOldFiles" class="btn btn--outline">
                        ?️ Pulisci File Vecchi
                    </button>
                </div>
            </div>
        </div>
    </div>

    <!-- Confirmation Modal -->
    <div id="confirmModal" class="modal hidden">
        <div class="modal-content">
            <div class="modal-header">
                <h3 id="confirmTitle">Conferma</h3>
            </div>
            <div class="modal-body">
                <p id="confirmMessage"></p>
            </div>
            <div class="form-actions">
                <button id="confirmYes" class="btn btn--primary">Sì</button>
                <button id="confirmNo" class="btn btn--outline">No</button>
            </div>
        </div>
    </div>

    <script src="app.js"></script>
</body>
</html>

:root {
  /* Primitive Color Tokens */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  --color-cream-50: rgba(252, 252, 249, 1);
  --color-cream-100: rgba(255, 255, 253, 1);
  --color-gray-200: rgba(245, 245, 245, 1);
  --color-gray-300: rgba(167, 169, 169, 1);
  --color-gray-400: rgba(119, 124, 124, 1);
  --color-slate-500: rgba(98, 108, 113, 1);
  --color-brown-600: rgba(94, 82, 64, 1);
  --color-charcoal-700: rgba(31, 33, 33, 1);
  --color-charcoal-800: rgba(38, 40, 40, 1);
  --color-slate-900: rgba(19, 52, 59, 1);
  --color-teal-300: rgba(50, 184, 198, 1);
  --color-teal-400: rgba(45, 166, 178, 1);
  --color-teal-500: rgba(33, 128, 141, 1);
  --color-teal-600: rgba(29, 116, 128, 1);
  --color-teal-700: rgba(26, 104, 115, 1);
  --color-teal-800: rgba(41, 150, 161, 1);
  --color-red-400: rgba(255, 84, 89, 1);
  --color-red-500: rgba(192, 21, 47, 1);
  --color-orange-400: rgba(230, 129, 97, 1);
  --color-orange-500: rgba(168, 75, 47, 1);

  /* RGB versions for opacity control */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  --color-slate-500-rgb: 98, 108, 113;
  --color-red-500-rgb: 192, 21, 47;
  --color-red-400-rgb: 255, 84, 89;
  --color-orange-500-rgb: 168, 75, 47;
  --color-orange-400-rgb: 230, 129, 97;

  /* Background color tokens (Light Mode) */
  --color-bg-1: rgba(59, 130, 246, 0.08); /* Light blue */
  --color-bg-2: rgba(245, 158, 11, 0.08); /* Light yellow */
  --color-bg-3: rgba(34, 197, 94, 0.08); /* Light green */
  --color-bg-4: rgba(239, 68, 68, 0.08); /* Light red */
  --color-bg-5: rgba(147, 51, 234, 0.08); /* Light purple */
  --color-bg-6: rgba(249, 115, 22, 0.08); /* Light orange */
  --color-bg-7: rgba(236, 72, 153, 0.08); /* Light pink */
  --color-bg-8: rgba(6, 182, 212, 0.08); /* Light cyan */

  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-primary-active: var(--color-teal-700);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
  --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
  --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
  --color-error: var(--color-red-500);
  --color-success: var(--color-teal-500);
  --color-warning: var(--color-orange-500);
  --color-info: var(--color-slate-500);
  --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);
  --color-select-caret: rgba(var(--color-slate-900-rgb), 0.8);

  /* Common style patterns */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --status-bg-opacity: 0.15;
  --status-border-opacity: 0.25;
  --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

  /* RGB versions for opacity control */
  --color-success-rgb: 33, 128, 141;
  --color-error-rgb: 192, 21, 47;
  --color-warning-rgb: 168, 75, 47;
  --color-info-rgb: 98, 108, 113;

  /* Typography */
  --font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: "Berkeley Mono", ui-monospace, SFMono-Regular, Menlo,
    Monaco, Consolas, monospace;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;
  --font-size-3xl: 24px;
  --font-size-4xl: 30px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing-tight: -0.01em;

  /* Spacing */
  --space-0: 0;
  --space-1: 1px;
  --space-2: 2px;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04),
    0 2px 4px -1px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04),
    0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1px 0 rgba(0, 0, 0, 0.03);

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    /* RGB versions for opacity control (Dark Mode) */
    --color-gray-400-rgb: 119, 124, 124;
    --color-teal-300-rgb: 50, 184, 198;
    --color-gray-300-rgb: 167, 169, 169;
    --color-gray-200-rgb: 245, 245, 245;

    /* Background color tokens (Dark Mode) */
    --color-bg-1: rgba(29, 78, 216, 0.15); /* Dark blue */
    --color-bg-2: rgba(180, 83, 9, 0.15); /* Dark yellow */
    --color-bg-3: rgba(21, 128, 61, 0.15); /* Dark green */
    --color-bg-4: rgba(185, 28, 28, 0.15); /* Dark red */
    --color-bg-5: rgba(107, 33, 168, 0.15); /* Dark purple */
    --color-bg-6: rgba(194, 65, 12, 0.15); /* Dark orange */
    --color-bg-7: rgba(190, 24, 93, 0.15); /* Dark pink */
    --color-bg-8: rgba(8, 145, 178, 0.15); /* Dark cyan */
    
    /* Semantic Color Tokens (Dark Mode) */
    --color-background: var(--color-charcoal-700);
    --color-surface: var(--color-charcoal-800);
    --color-text: var(--color-gray-200);
    --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
    --color-primary: var(--color-teal-300);
    --color-primary-hover: var(--color-teal-400);
    --color-primary-active: var(--color-teal-800);
    --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
    --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
    --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
    --color-border: rgba(var(--color-gray-400-rgb), 0.3);
    --color-error: var(--color-red-400);
    --color-success: var(--color-teal-300);
    --color-warning: var(--color-orange-400);
    --color-info: var(--color-gray-300);
    --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
    --color-btn-primary-text: var(--color-slate-900);
    --color-card-border: rgba(var(--color-gray-400-rgb), 0.2);
    --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
      inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    --button-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
    --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
    --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);

    /* Common style patterns - updated for dark mode */
    --focus-ring: 0 0 0 3px var(--color-focus-ring);
    --focus-outline: 2px solid var(--color-primary);
    --status-bg-opacity: 0.15;
    --status-border-opacity: 0.25;
    --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

    /* RGB versions for dark mode */
    --color-success-rgb: var(--color-teal-300-rgb);
    --color-error-rgb: var(--color-red-400-rgb);
    --color-warning-rgb: var(--color-orange-400-rgb);
    --color-info-rgb: var(--color-gray-300-rgb);
  }
}

/* Data attribute for manual theme switching */
[data-color-scheme="dark"] {
  /* RGB versions for opacity control (dark mode) */
  --color-gray-400-rgb: 119, 124, 124;
  --color-teal-300-rgb: 50, 184, 198;
  --color-gray-300-rgb: 167, 169, 169;
  --color-gray-200-rgb: 245, 245, 245;

  /* Colorful background palette - Dark Mode */
  --color-bg-1: rgba(29, 78, 216, 0.15); /* Dark blue */
  --color-bg-2: rgba(180, 83, 9, 0.15); /* Dark yellow */
  --color-bg-3: rgba(21, 128, 61, 0.15); /* Dark green */
  --color-bg-4: rgba(185, 28, 28, 0.15); /* Dark red */
  --color-bg-5: rgba(107, 33, 168, 0.15); /* Dark purple */
  --color-bg-6: rgba(194, 65, 12, 0.15); /* Dark orange */
  --color-bg-7: rgba(190, 24, 93, 0.15); /* Dark pink */
  --color-bg-8: rgba(8, 145, 178, 0.15); /* Dark cyan */
  
  /* Semantic Color Tokens (Dark Mode) */
  --color-background: var(--color-charcoal-700);
  --color-surface: var(--color-charcoal-800);
  --color-text: var(--color-gray-200);
  --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
  --color-primary: var(--color-teal-300);
  --color-primary-hover: var(--color-teal-400);
  --color-primary-active: var(--color-teal-800);
  --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
  --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
  --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
  --color-border: rgba(var(--color-gray-400-rgb), 0.3);
  --color-error: var(--color-red-400);
  --color-success: var(--color-teal-300);
  --color-warning: var(--color-orange-400);
  --color-info: var(--color-gray-300);
  --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
  --color-btn-primary-text: var(--color-slate-900);
  --color-card-border: rgba(var(--color-gray-400-rgb), 0.15);
  --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.15);
  --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
  --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);

  /* Common style patterns - updated for dark mode */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --status-bg-opacity: 0.15;
  --status-border-opacity: 0.25;
  --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

  /* RGB versions for dark mode */
  --color-success-rgb: var(--color-teal-300-rgb);
  --color-error-rgb: var(--color-red-400-rgb);
  --color-warning-rgb: var(--color-orange-400-rgb);
  --color-info-rgb: var(--color-gray-300-rgb);
}

[data-color-scheme="light"] {
  /* RGB versions for opacity control (light mode) */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  
  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-primary-active: var(--color-teal-700);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
  --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
  --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
  --color-error: var(--color-red-500);
  --color-success: var(--color-teal-500);
  --color-warning: var(--color-orange-500);
  --color-info: var(--color-slate-500);
  --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);

  /* RGB versions for light mode */
  --color-success-rgb: var(--color-teal-500-rgb);
  --color-error-rgb: var(--color-red-500-rgb);
  --color-warning-rgb: var(--color-orange-500-rgb);
  --color-info-rgb: var(--color-slate-500-rgb);
}

/* Base styles */
html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-tight);
}

h1 {
  font-size: var(--font-size-4xl);
}
h2 {
  font-size: var(--font-size-3xl);
}
h3 {
  font-size: var(--font-size-2xl);
}
h4 {
  font-size: var(--font-size-xl);
}
h5 {
  font-size: var(--font-size-lg);
}
h6 {
  font-size: var(--font-size-md);
}

p {
  margin: 0 0 var(--space-16) 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
  color: var(--color-primary-hover);
}

code,
pre {
  font-family: var(--font-family-mono);
  font-size: calc(var(--font-size-base) * 0.95);
  background-color: var(--color-secondary);
  border-radius: var(--radius-sm);
}

code {
  padding: var(--space-1) var(--space-4);
}

pre {
  padding: var(--space-16);
  margin: var(--space-16) 0;
  overflow: auto;
  border: 1px solid var(--color-border);
}

pre code {
  background: none;
  padding: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  border: none;
  text-decoration: none;
  position: relative;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
}

.btn--primary:active {
  background: var(--color-primary-active);
}

.btn--secondary {
  background: var(--color-secondary);
  color: var(--color-text);
}

.btn--secondary:hover {
  background: var(--color-secondary-hover);
}

.btn--secondary:active {
  background: var(--color-secondary-active);
}

.btn--outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn--outline:hover {
  background: var(--color-secondary);
}

.btn--sm {
  padding: var(--space-4) var(--space-12);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-sm);
}

.btn--lg {
  padding: var(--space-10) var(--space-20);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-md);
}

.btn--full-width {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Form elements */
.form-control {
  display: block;
  width: 100%;
  padding: var(--space-8) var(--space-12);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  transition: border-color var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
}

textarea.form-control {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
}

select.form-control {
  padding: var(--space-8) var(--space-12);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: var(--select-caret-light);
  background-repeat: no-repeat;
  background-position: right var(--space-12) center;
  background-size: 16px;
  padding-right: var(--space-32);
}

/* Add a dark mode specific caret */
@media (prefers-color-scheme: dark) {
  select.form-control {
    background-image: var(--select-caret-dark);
  }
}

/* Also handle data-color-scheme */
[data-color-scheme="dark"] select.form-control {
  background-image: var(--select-caret-dark);
}

[data-color-scheme="light"] select.form-control {
  background-image: var(--select-caret-light);
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: var(--focus-outline);
}

.form-label {
  display: block;
  margin-bottom: var(--space-8);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.form-group {
  margin-bottom: var(--space-16);
}

/* Card component */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--duration-normal) var(--ease-standard);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card__body {
  padding: var(--space-16);
}

.card__header,
.card__footer {
  padding: var(--space-16);
  border-bottom: 1px solid var(--color-card-border-inner);
}

/* Status indicators - simplified with CSS variables */
.status {
  display: inline-flex;
  align-items: center;
  padding: var(--space-6) var(--space-12);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.status--success {
  background-color: rgba(
    var(--color-success-rgb, 33, 128, 141),
    var(--status-bg-opacity)
  );
  color: var(--color-success);
  border: 1px solid
    rgba(var(--color-success-rgb, 33, 128, 141), var(--status-border-opacity));
}

.status--error {
  background-color: rgba(
    var(--color-error-rgb, 192, 21, 47),
    var(--status-bg-opacity)
  );
  color: var(--color-error);
  border: 1px solid
    rgba(var(--color-error-rgb, 192, 21, 47), var(--status-border-opacity));
}

.status--warning {
  background-color: rgba(
    var(--color-warning-rgb, 168, 75, 47),
    var(--status-bg-opacity)
  );
  color: var(--color-warning);
  border: 1px solid
    rgba(var(--color-warning-rgb, 168, 75, 47), var(--status-border-opacity));
}

.status--info {
  background-color: rgba(
    var(--color-info-rgb, 98, 108, 113),
    var(--status-bg-opacity)
  );
  color: var(--color-info);
  border: 1px solid
    rgba(var(--color-info-rgb, 98, 108, 113), var(--status-border-opacity));
}

/* Container layout */
.container {
  width: 100%;
  margin-right: auto;
  margin-left: auto;
  padding-right: var(--space-16);
  padding-left: var(--space-16);
}

@media (min-width: 640px) {
  .container {
    max-width: var(--container-sm);
  }
}
@media (min-width: 768px) {
  .container {
    max-width: var(--container-md);
  }
}
@media (min-width: 1024px) {
  .container {
    max-width: var(--container-lg);
  }
}
@media (min-width: 1280px) {
  .container {
    max-width: var(--container-xl);
  }
}

/* Utility classes */
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-center {
  justify-content: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-4 {
  gap: var(--space-4);
}
.gap-8 {
  gap: var(--space-8);
}
.gap-16 {
  gap: var(--space-16);
}

.m-0 {
  margin: 0;
}
.mt-8 {
  margin-top: var(--space-8);
}
.mb-8 {
  margin-bottom: var(--space-8);
}
.mx-8 {
  margin-left: var(--space-8);
  margin-right: var(--space-8);
}
.my-8 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-8);
}

.p-0 {
  padding: 0;
}
.py-8 {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}
.px-8 {
  padding-left: var(--space-8);
  padding-right: var(--space-8);
}
.py-16 {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}
.px-16 {
  padding-left: var(--space-16);
  padding-right: var(--space-16);
}

.block {
  display: block;
}
.hidden {
  display: none;
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

/* Dark mode specifics */
[data-color-scheme="dark"] .btn--outline {
  border: 1px solid var(--color-border-secondary);
}

@font-face {
  font-family: 'FKGroteskNeue';
  src: url('https://r2cdn.perplexity.ai/fonts/FKGroteskNeue.woff2')
    format('woff2');
}

/* END PERPLEXITY DESIGN SYSTEM */
/* Application Specific Styles */

/* Toast Notifications */
#toast-container {
  position: fixed;
  top: var(--space-20);
  right: var(--space-20);
  z-index: 1050;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  max-width: 400px;
}

.toast {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-12) var(--space-16);
  box-shadow: var(--shadow-lg);
  transform: translateX(100%);
  opacity: 0;
  transition: all var(--duration-normal) var(--ease-standard);
  position: relative;
  overflow: hidden;
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
}

.toast--success::before {
  background: var(--color-success);
}

.toast--error::before {
  background: var(--color-error);
}

.toast--warning::before {
  background: var(--color-warning);
}

.toast--info::before {
  background: var(--color-info);
}

.toast-content {
  display: flex;
  align-items: flex-start;
  gap: var(--space-8);
}

.toast-icon {
  font-size: var(--font-size-lg);
  line-height: 1;
}

.toast-text {
  flex: 1;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
}

.toast-close {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: var(--font-size-lg);
  padding: 0;
  line-height: 1;
}

/* Modals */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-standard);
}

.modal.show {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 600px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9);
  transition: transform var(--duration-normal) var(--ease-standard);
}

.modal.show .modal-content {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-20) var(--space-20) var(--space-16) var(--space-20);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  margin: 0;
  font-size: var(--font-size-xl);
}

.modal-body {
  padding: var(--space-20);
}

/* Setup Steps */
.setup-steps {
  display: flex;
  gap: var(--space-8);
}

.step-indicator {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-secondary);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  transition: all var(--duration-fast) var(--ease-standard);
}

.step-indicator.active {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
}

.step-indicator.completed {
  background: var(--color-success);
  color: var(--color-btn-primary-text);
}

.setup-step {
  min-height: 400px;
}

.setup-step.hidden {
  display: none;
}

.setup-step h4 {
  margin: 0 0 var(--space-20) 0;
  color: var(--color-text);
  font-size: var(--font-size-lg);
}

/* Folder Selection */
.folder-selection-info {
  display: flex;
  gap: var(--space-16);
  padding: var(--space-16);
  background: var(--color-bg-1);
  border-radius: var(--radius-base);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-24);
}

.info-icon {
  font-size: var(--font-size-4xl);
  line-height: 1;
}

.info-content p {
  margin: 0 0 var(--space-8) 0;
  font-size: var(--font-size-sm);
}

.info-content code {
  background: var(--color-secondary);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
}

.folder-selection {
  margin-bottom: var(--space-24);
}

.folder-status {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  padding: var(--space-16);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  margin-bottom: var(--space-16);
}

.folder-icon {
  font-size: var(--font-size-lg);
}

.folder-path {
  flex: 1;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.folder-path.selected {
  color: var(--color-success);
  font-weight: var(--font-weight-medium);
}

.folder-fallback {
  padding: var(--space-16);
  background: var(--color-bg-4);
  border-radius: var(--radius-base);
  border: 1px solid rgba(var(--color-warning-rgb), 0.3);
  margin-top: var(--space-16);
}

.warning-text {
  color: var(--color-warning);
  font-weight: var(--font-weight-medium);
  margin: 0 0 var(--space-8) 0;
}

/* Header */
.header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-16) 0;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-info {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

.user-badge, .version-badge {
  background: var(--color-bg-1);
  color: var(--color-text);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.save-status {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-base);
  font-size: var(--font-size-sm);
  transition: all var(--duration-fast) var(--ease-standard);
}

.save-status.saving {
  background: var(--color-bg-2);
  color: var(--color-warning);
}

.save-status.saved {
  background: var(--color-bg-3);
  color: var(--color-success);
}

.save-status.error {
  background: var(--color-bg-4);
  color: var(--color-error);
}

.save-indicator {
  font-size: var(--font-size-base);
}

.save-text {
  font-weight: var(--font-weight-medium);
}

/* Storage Info Banner */
.storage-info {
  background: var(--color-bg-1);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-8) 0;
}

.storage-content {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  font-size: var(--font-size-sm);
}

.storage-icon {
  font-size: var(--font-size-lg);
}

.storage-text {
  flex: 1;
  color: var(--color-text-secondary);
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(var(--color-background), 0.95);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.loading-content {
  text-align: center;
  padding: var(--space-32);
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-24) auto;
}

.loading-content h3 {
  margin: 0 0 var(--space-8) 0;
  color: var(--color-text);
}

.loading-content p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Navigation */
.nav-tabs {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0;
}

.nav-tab {
  background: none;
  border: none;
  padding: var(--space-16) var(--space-20);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--duration-fast) var(--ease-standard);
}

.nav-tab:hover {
  color: var(--color-text);
  background: var(--color-bg-2);
}

.nav-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* Main Content */
.main-content {
  padding: var(--space-24) 0;
}

.page-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
}

/* Import/Export Section */
.import-export-section {
  margin-bottom: var(--space-24);
}

.import-export-controls {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-24);
  align-items: center;
}

.export-section {
  text-align: center;
}

.export-info {
  display: block;
  margin-top: var(--space-8);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.import-section {
  position: relative;
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-32);
  text-align: center;
  transition: all var(--duration-normal) var(--ease-standard);
  cursor: pointer;
}

.drop-zone:hover {
  border-color: var(--color-primary);
  background: var(--color-bg-1);
}

.drop-zone.drag-over {
  border-color: var(--color-primary);
  background: var(--color-bg-3);
  transform: scale(1.02);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-12);
}

.drop-icon {
  font-size: var(--font-size-4xl);
  opacity: 0.7;
}

.drop-zone p {
  margin: 0;
  color: var(--color-text-secondary);
}

.drop-zone small {
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
}

/* Form Rows */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: end;
}

.form-row .form-group.flex-1 {
  grid-column: span 2;
}

/* Services */
.service-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  padding: var(--space-16);
  margin-bottom: var(--space-16);
  background: var(--color-bg-1);
}

.service-item .form-row {
  grid-template-columns: 2fr 1fr 1fr auto;
  align-items: end;
}

/* Patient Info */
.patient-controls {
  display: flex;
  gap: var(--space-12);
  margin-bottom: var(--space-20);
}

.patient-controls select {
  flex: 1;
}

.patient-info {
  background: var(--color-bg-2);
  border-radius: var(--radius-base);
  padding: var(--space-16);
  border: 1px solid var(--color-border);
}

.patient-info h4 {
  margin: 0 0 var(--space-12) 0;
  color: var(--color-text);
}

/* Invoice Total */
.invoice-total {
  text-align: right;
  padding: var(--space-16);
  background: var(--color-bg-3);
  border-radius: var(--radius-base);
  margin: var(--space-20) 0;
  font-size: var(--font-size-lg);
}

/* Form Actions */
.form-actions {
  display: flex;
  gap: var(--space-12);
  justify-content: flex-end;
  padding-top: var(--space-20);
  border-top: 1px solid var(--color-border);
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-16);
}

.data-table th,
.data-table td {
  text-align: left;
  padding: var(--space-12);
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  background: var(--color-bg-1);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.data-table tr:hover {
  background: var(--color-bg-2);
}

.table-actions {
  display: flex;
  gap: var(--space-8);
}

.table-actions .btn {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-xs);
}

/* Statistics */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-20);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  padding: var(--space-16);
  background: var(--color-bg-1);
  border-radius: var(--radius-base);
  border: 1px solid var(--color-border);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  word-break: break-all;
}

/* Settings */
.settings-section {
  margin-bottom: var(--space-24);
  padding-bottom: var(--space-24);
  border-bottom: 1px solid var(--color-border);
}

.settings-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.settings-section h4 {
  margin: 0 0 var(--space-16) 0;
  color: var(--color-text);
}

.current-folder p {
  margin: 0 0 var(--space-8) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.folder-display {
  background: var(--color-bg-1);
  padding: var(--space-12);
  border-radius: var(--radius-base);
  border: 1px solid var(--color-border);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  margin-bottom: var(--space-16);
  word-break: break-all;
}

/* Responsive Design */
@media (max-width: 768px) {
  .import-export-controls {
    grid-template-columns: 1fr;
    gap: var(--space-16);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .service-item .form-row {
    grid-template-columns: 1fr;
  }

  .patient-controls {
    flex-direction: column;
  }

  .form-actions {
    flex-direction: column;
  }

  .header-content {
    flex-direction: column;
    gap: var(--space-12);
    text-align: center;
  }

  .header-info {
    justify-content: center;
    flex-wrap: wrap;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  #toast-container {
    right: var(--space-8);
    left: var(--space-8);
    max-width: none;
  }

  .modal-content {
    width: 95%;
    margin: var(--space-16);
  }

  .setup-steps {
    justify-content: center;
  }

  .folder-selection-info {
    flex-direction: column;
    text-align: center;
  }

  .storage-content {
    flex-direction: column;
    text-align: center;
    gap: var(--space-8);
  }
}

/* Print Styles */
@media print {
  .header,
  .nav-tabs,
  .import-export-section,
  .form-actions,
  .btn,
  #toast-container,
  .storage-info {
    display: none !important;
  }

  .main-content {
    padding: 0;
  }

  .card {
    box-shadow: none;
    border: none;
  }

  .page-content {
    gap: var(--space-16);
  }

  body {
    background: white !important;
  }
}

/* Loading States */
.loading {
  position: relative;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Animation Classes */
.fade-in {
  animation: fadeIn 0.3s ease-out;
}

.fade-out {
  animation: fadeOut 0.3s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeOut {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}

/* Status Badges */
.status-badge {
  display: inline-block;
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.status-badge--paid {
  background: rgba(var(--color-success-rgb), 0.15);
  color: var(--color-success);
  border: 1px solid rgba(var(--color-success-rgb), 0.25);
}

.status-badge--pending {
  background: rgba(var(--color-warning-rgb), 0.15);
  color: var(--color-warning);
  border: 1px solid rgba(var(--color-warning-rgb), 0.25);
}

.status-badge--overdue {
  background: rgba(var(--color-error-rgb), 0.15);
  color: var(--color-error);
  border: 1px solid rgba(var(--color-error-rgb), 0.25);
}

/* Empty States */
.empty-state {
  text-align: center;
  padding: var(--space-32);
  color: var(--color-text-secondary);
}

.empty-state-icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-16);
  opacity: 0.5;
}

.empty-state h3 {
  margin-bottom: var(--space-8);
  color: var(--color-text-secondary);
}

.empty-state p {
  margin-bottom: var(--space-20);
}

/* Accessibility Improvements */
.btn:focus-visible,
.form-control:focus-visible,
.nav-tab:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .drop-zone {
    border-width: 3px;
  }
  
  .card {
    border-width: 2px;
  }
  
  .btn {
    border-width: 2px;
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

// Folder Management System
class FolderManager {
    constructor() {
        this.folderHandle = null;
        this.isSupported = 'showDirectoryPicker' in window;
        this.saveQueue = [];
        this.isSaving = false;
    }

    async selectFolder() {
        if (!this.isSupported) {
            throw new Error('File System Access API not supported');
        }

        try {
            this.folderHandle = await window.showDirectoryPicker({
                mode: 'readwrite'
            });
            
            // Store folder handle for persistence
            await this.storeFolderHandle();
            return this.folderHandle;
        } catch (error) {
            if (error.name === 'AbortError') {
                throw new Error('Folder selection cancelled');
            }
            throw error;
        }
    }

    async storeFolderHandle() {
        if (this.folderHandle) {
            const handleData = await this.folderHandle.queryPermission({ mode: 'readwrite' });
            if (handleData === 'granted') {
                // Store in IndexedDB for persistence
                const serialized = await this.serializeFolderHandle();
                localStorage.setItem('folderHandle', serialized);
            }
        }
    }

    async serializeFolderHandle() {
        if (!this.folderHandle) return null;
        try {
            // Create a simple reference that can be stored
            return JSON.stringify({
                name: this.folderHandle.name,
                kind: this.folderHandle.kind,
                timestamp: Date.now()
            });
        } catch (error) {
            console.warn('Could not serialize folder handle:', error);
            return null;
        }
    }

    async restoreFolderHandle() {
        const stored = localStorage.getItem('folderHandle');
        if (!stored || !this.isSupported) return false;

        try {
            // For security reasons, we need to re-request the folder
            // This is a limitation of the File System Access API
            return false;
        } catch (error) {
            localStorage.removeItem('folderHandle');
            return false;
        }
    }

    generateFileName(username) {
        const now = new Date();
        const timestamp = now.toISOString()
            .replace(/[:.]/g, '-')
            .replace('T', '-')
            .slice(0, 19);
        return `Fatture_${username}_${timestamp}.json`;
    }

    async saveToFolder(userData, username) {
        if (!this.folderHandle) {
            throw new Error('No folder selected');
        }

        const fileName = this.generateFileName(username);
        const dataWithMetadata = {
            metadata: {
                filename: fileName,
                createdDate: new Date().toISOString(),
                username: username,
                appVersion: "1.0",
                dataVersion: "1.0"
            },
            userData: {
                ...userData,
                lastModified: new Date().toISOString()
            }
        };

        try {
            const fileHandle = await this.folderHandle.getFileHandle(fileName, {
                create: true
            });
            
            const writable = await fileHandle.createWritable();
            await writable.write(JSON.stringify(dataWithMetadata, null, 2));
            await writable.close();

            // Clean up old files (keep last 10)
            await this.cleanupOldFiles(username);

            return fileName;
        } catch (error) {
            if (error.name === 'NotAllowedError') {
                throw new Error('Permission denied to write to folder');
            }
            throw error;
        }
    }

    async loadLatestFromFolder(username) {
        if (!this.folderHandle) {
            return null;
        }

        try {
            const files = [];
            
            for await (const [name, handle] of this.folderHandle.entries()) {
                if (handle.kind === 'file' && 
                    name.startsWith(`Fatture_${username}_`) && 
                    name.endsWith('.json')) {
                    
                    // Extract timestamp from filename
                    const timestampMatch = name.match(/Fatture_.*_(\d{4}-\d{2}-\d{2}-\d{2}-\d{2}-\d{2})\.json$/);
                    if (timestampMatch) {
                        files.push({
                            name,
                            handle,
                            timestamp: timestampMatch[1]
                        });
                    }
                }
            }

            if (files.length === 0) {
                return null;
            }

            // Sort by timestamp (newest first)
            files.sort((a, b) => b.timestamp.localeCompare(a.timestamp));
            
            const latestFile = files[0];
            const file = await latestFile.handle.getFile();
            const content = await file.text();
            
            const data = JSON.parse(content);
            return {
                ...data,
                loadedFrom: latestFile.name,
                loadedAt: new Date().toISOString()
            };

        } catch (error) {
            console.error('Error loading from folder:', error);
            return null;
        }
    }

    async cleanupOldFiles(username, keepCount = 10) {
        if (!this.folderHandle) return;

        try {
            const files = [];
            
            for await (const [name, handle] of this.folderHandle.entries()) {
                if (handle.kind === 'file' && 
                    name.startsWith(`Fatture_${username}_`) && 
                    name.endsWith('.json')) {
                    
                    const timestampMatch = name.match(/Fatture_.*_(\d{4}-\d{2}-\d{2}-\d{2}-\d{2}-\d{2})\.json$/);
                    if (timestampMatch) {
                        files.push({
                            name,
                            handle,
                            timestamp: timestampMatch[1]
                        });
                    }
                }
            }

            // Sort by timestamp (newest first)
            files.sort((a, b) => b.timestamp.localeCompare(a.timestamp));
            
            // Remove old files beyond keepCount
            const filesToDelete = files.slice(keepCount);
            for (const file of filesToDelete) {
                try {
                    await this.folderHandle.removeEntry(file.name);
                } catch (error) {
                    console.warn(`Could not delete old file ${file.name}:`, error);
                }
            }

            return files.length - filesToDelete.length;
        } catch (error) {
            console.error('Error during cleanup:', error);
            return 0;
        }
    }

    async getFolderInfo() {
        if (!this.folderHandle) return null;
        
        try {
            return {
                name: this.folderHandle.name,
                path: this.folderHandle.name // Limited info available
            };
        } catch (error) {
            return null;
        }
    }

    async countBackupFiles(username) {
        if (!this.folderHandle) return 0;

        try {
            let count = 0;
            for await (const [name] of this.folderHandle.entries()) {
                if (name.startsWith(`Fatture_${username}_`) && name.endsWith('.json')) {
                    count++;
                }
            }
            return count;
        } catch (error) {
            return 0;
        }
    }
}

// Application State
let currentUser = null;
let currentUserData = {
    user: '',
    doctorData: {},
    patients: [],
    invoices: [],
    counters: { invoice: 1 },
    metadata: {
        exportDate: null,
        version: "1.0",
        lastModified: null,
        totalPatients: 0,
        totalInvoices: 0
    }
};

let folderManager = new FolderManager();
let currentFileName = null;
let saveTimeout = null;

// Default data
const defaultDoctorInfo = {
    name: "Dr. Daniele Miccichè",
    address: "Corso Umbria, 10144, Torino",
    piva: "13155780011",
    cf: "MCCDNL98E26L219W",
    professional_title: "Medico-chirurgo",
    medical_order: "O.M. Torino 27505"
};

const legalText = {
    iva_exemption: "IVA: esente ai sensi dell'art. 10 comma 18 DPR 633/1972",
    stamp_duty: "Marca da bollo € 2,00 applicata se importo > € 77,47",
    fiscal_regime: "Regime fiscale: Operazione effettuata ai sensi dell'articolo 1, commi 54-89, Legge 190/2014 (regime forfettario) - esente IVA"
};

// Application Initialization
document.addEventListener('DOMContentLoaded', function() {
    initializeApp();
    setupEventListeners();
    setDefaultDate();
});

async function initializeApp() {
    showLoadingScreen('Inizializzazione applicazione...');
    
    currentUser = localStorage.getItem('currentUser');
    
    if (!currentUser) {
        hideLoadingScreen();
        showSetupModal();
    } else {
        try {
            await loadUserData();
            updateUI();
            updateNavigation('generator');
            hideSetupModal();
            hideLoadingScreen();
        } catch (error) {
            console.error('Initialization error:', error);
            hideLoadingScreen();
            showToast('❌ Errore durante il caricamento', 'error');
        }
    }
}

// Loading Screen Management
function showLoadingScreen(text = 'Caricamento...') {
    const loadingScreen = document.getElementById('loadingScreen');
    const loadingText = document.getElementById('loadingText');
    if (loadingScreen && loadingText) {
        loadingText.textContent = text;
        loadingScreen.classList.remove('hidden');
    }
}

function hideLoadingScreen() {
    const loadingScreen = document.getElementById('loadingScreen');
    if (loadingScreen) {
        loadingScreen.classList.add('hidden');
    }
}

// Setup Modal Management
function showSetupModal() {
    const modal = document.getElementById('setupModal');
    if (modal) {
        modal.classList.add('show');
        
        // Reset to step 1
        showSetupStep(1);
        
        // Fill with default data
        fillSetupForm();
        
        // Check folder support and enable completion if not supported
        if (!folderManager.isSupported) {
            const folderNotSupported = document.getElementById('folderNotSupported');
            if (folderNotSupported) {
                folderNotSupported.classList.remove('hidden');
            }
            // Enable completion button for unsupported browsers
            const completeSetup = document.getElementById('completeSetup');
            if (completeSetup) {
                completeSetup.disabled = false;
            }
        }
    }
}

function fillSetupForm() {
    const fields = [
        { id: 'doctorName', value: defaultDoctorInfo.name },
        { id: 'doctorAddress', value: defaultDoctorInfo.address },
        { id: 'doctorPiva', value: defaultDoctorInfo.piva },
        { id: 'doctorCf', value: defaultDoctorInfo.cf },
        { id: 'doctorTitle', value: defaultDoctorInfo.professional_title },
        { id: 'doctorOrder', value: defaultDoctorInfo.medical_order }
    ];
    
    fields.forEach(field => {
        const element = document.getElementById(field.id);
        if (element) {
            element.value = field.value;
        }
    });
}

function hideSetupModal() {
    const modal = document.getElementById('setupModal');
    if (modal) {
        modal.classList.remove('show');
    }
}

function showSetupStep(stepNumber) {
    // Hide all steps
    for (let i = 1; i <= 3; i++) {
        const step = document.getElementById(`setupStep${i}`);
        if (step) {
            step.classList.add('hidden');
        }
    }
    
    // Show current step
    const currentStep = document.getElementById(`setupStep${stepNumber}`);
    if (currentStep) {
        currentStep.classList.remove('hidden');
    }
    
    // Update step indicators
    for (let i = 1; i <= 3; i++) {
        const indicator = document.querySelector(`.step-${i}`);
        if (indicator) {
            indicator.classList.remove('active', 'completed');
            if (i < stepNumber) {
                indicator.classList.add('completed');
            } else if (i === stepNumber) {
                indicator.classList.add('active');
            }
        }
    }

    // Enable completion button when reaching step 3
    if (stepNumber === 3) {
        const completeSetup = document.getElementById('completeSetup');
        if (completeSetup) {
            completeSetup.disabled = false;
        }
    }
}

// User Data Management
async function loadUserData() {
    showLoadingScreen('Tentativo di caricamento dal folder...');
    
    try {
        // Try to load from folder first
        if (folderManager.folderHandle) {
            const folderData = await folderManager.loadLatestFromFolder(currentUser);
            if (folderData && folderData.userData) {
                currentUserData = folderData.userData;
                currentFileName = folderData.loadedFrom;
                
                // Ensure metadata exists
                if (!currentUserData.metadata) {
                    currentUserData.metadata = {
                        exportDate: new Date().toISOString(),
                        version: "1.0",
                        lastModified: new Date().toISOString(),
                        totalPatients: currentUserData.patients?.length || 0,
                        totalInvoices: currentUserData.invoices?.length || 0
                    };
                }
                
                updateStorageInfo();
                showToast(`✅ Dati caricati da: ${folderData.loadedFrom}`, 'success');
                return;
            }
        }
    } catch (error) {
        console.error('Error loading from folder:', error);
        showToast('⚠️ Impossibile accedere alla cartella, uso localStorage', 'warning');
    }
    
    // Fallback to localStorage
    showLoadingScreen('Caricamento da memoria locale...');
    const userData = localStorage.getItem(`userData_${currentUser}`);
    if (userData) {
        currentUserData = JSON.parse(userData);
        
        // Ensure metadata exists
        if (!currentUserData.metadata) {
            currentUserData.metadata = {
                exportDate: new Date().toISOString(),
                version: "1.0",
                lastModified: new Date().toISOString(),
                totalPatients: currentUserData.patients?.length || 0,
                totalInvoices: currentUserData.invoices?.length || 0
            };
        }
    } else {
        // Create new user data structure
        currentUserData = {
            user: currentUser,
            doctorData: {},
            patients: [],
            invoices: [],
            counters: { invoice: 1 },
            metadata: {
                exportDate: new Date().toISOString(),
                version: "1.0",
                lastModified: new Date().toISOString(),
                totalPatients: 0,
                totalInvoices: 0
            }
        };
    }
}

async function saveUserData() {
    // Update metadata
    currentUserData.metadata.lastModified = new Date().toISOString();
    currentUserData.metadata.totalPatients = currentUserData.patients.length;
    currentUserData.metadata.totalInvoices = currentUserData.invoices.length;
    
    // Show saving status
    updateSaveStatus('saving');
    
    // Debounce saves to prevent excessive file operations
    if (saveTimeout) {
        clearTimeout(saveTimeout);
    }
    
    saveTimeout = setTimeout(async () => {
        try {
            // Try to save to folder first
            if (folderManager.folderHandle) {
                const fileName = await folderManager.saveToFolder(currentUserData, currentUser);
                currentFileName = fileName;
                updateSaveStatus('saved');
                updateStorageInfo();
            } else {
                throw new Error('No folder available');
            }
        } catch (error) {
            console.error('Error saving to folder:', error);
            
            // Fallback to localStorage
            localStorage.setItem(`userData_${currentUser}`, JSON.stringify(currentUserData));
            updateSaveStatus('saved');
            
            if (error.message.includes('Permission denied') || error.message.includes('NotAllowedError')) {
                showToast('⚠️ Permesso negato per la cartella, salvato in locale', 'warning');
            }
        }
    }, 1000);
}

function updateSaveStatus(status) {
    const saveStatus = document.getElementById('saveStatus');
    const saveIndicator = document.getElementById('saveIndicator');
    const saveText = document.getElementById('saveText');
    
    if (!saveStatus || !saveIndicator || !saveText) return;
    
    saveStatus.className = `save-status ${status}`;
    
    switch (status) {
        case 'saving':
            saveIndicator.textContent = '?';
            saveText.textContent = 'Salvataggio...';
            break;
        case 'saved':
            saveIndicator.textContent = '✅';
            saveText.textContent = 'Salvato';
            break;
        case 'error':
            saveIndicator.textContent = '❌';
            saveText.textContent = 'Errore';
            break;
    }
}

function updateStorageInfo() {
    const storageInfo = document.getElementById('storageInfo');
    const storageText = document.getElementById('storageText');
    
    if (!storageInfo || !storageText) return;
    
    if (folderManager.folderHandle) {
        const folderInfo = folderManager.folderHandle.name;
        storageText.textContent = `Salvato in: ${folderInfo}`;
        storageInfo.classList.remove('hidden');
    } else {
        storageInfo.classList.add('hidden');
    }
}

// Event Listeners Setup
function setupEventListeners() {
    // Setup steps - ensure elements exist before adding listeners
    const nextStep1 = document.getElementById('nextStep1');
    const nextStep2 = document.getElementById('nextStep2');
    const prevStep2 = document.getElementById('prevStep2');
    const prevStep3 = document.getElementById('prevStep3');
    const completeSetup = document.getElementById('completeSetup');
    const selectFolderBtn = document.getElementById('selectFolderBtn');
    
    if (nextStep1) nextStep1.addEventListener('click', handleStep1Next);
    if (nextStep2) nextStep2.addEventListener('click', handleStep2Next);
    if (prevStep2) prevStep2.addEventListener('click', () => showSetupStep(1));
    if (prevStep3) prevStep3.addEventListener('click', () => showSetupStep(2));
    if (completeSetup) completeSetup.addEventListener('click', handleSetupComplete);
    if (selectFolderBtn) selectFolderBtn.addEventListener('click', handleFolderSelect);
    
    // Navigation
    const generatorTab = document.getElementById('generatorTab');
    const managementTab = document.getElementById('managementTab');
    if (generatorTab) generatorTab.addEventListener('click', () => updateNavigation('generator'));
    if (managementTab) managementTab.addEventListener('click', () => updateNavigation('management'));
    
    // Header controls
    const settingsBtn = document.getElementById('settingsBtn');
    const logoutBtn = document.getElementById('logoutBtn');
    const changeFolder = document.getElementById('changeFolder');
    if (settingsBtn) settingsBtn.addEventListener('click', showSettingsModal);
    if (logoutBtn) logoutBtn.addEventListener('click', handleLogout);
    if (changeFolder) changeFolder.addEventListener('click', handleFolderSelect);
    
    // Patient management
    const patientSelect = document.getElementById('patientSelect');
    const addPatientBtn = document.getElementById('addPatientBtn');
    const addNewPatientBtn = document.getElementById('addNewPatientBtn');
    if (patientSelect) patientSelect.addEventListener('change', handlePatientSelect);
    if (addPatientBtn) addPatientBtn.addEventListener('click', () => showPatientModal());
    if (addNewPatientBtn) addNewPatientBtn.addEventListener('click', () => showPatientModal());
    
    const patientForm = document.getElementById('patientForm');
    if (patientForm) {
        patientForm.addEventListener('submit', handlePatientSubmit);
    }
    
    const closePatientModal = document.getElementById('closePatientModal');
    const cancelPatientBtn = document.getElementById('cancelPatientBtn');
    if (closePatientModal) closePatientModal.addEventListener('click', hidePatientModal);
    if (cancelPatientBtn) cancelPatientBtn.addEventListener('click', hidePatientModal);
    
    // Invoice management
    const invoiceForm = document.getElementById('invoiceForm');
    if (invoiceForm) {
        invoiceForm.addEventListener('submit', handleInvoiceSubmit);
    }
    
    const addServiceBtn = document.getElementById('addServiceBtn');
    const printBtn = document.getElementById('printBtn');
    if (addServiceBtn) addServiceBtn.addEventListener('click', addServiceRow);
    if (printBtn) printBtn.addEventListener('click', handlePrint);
    
    // Import/Export
    const exportBtn = document.getElementById('exportBtn');
    const importBtn = document.getElementById('importBtn');
    const fileInput = document.getElementById('fileInput');
    if (exportBtn) exportBtn.addEventListener('click', handleExport);
    if (importBtn) importBtn.addEventListener('click', () => {
        if (fileInput) fileInput.click();
    });
    if (fileInput) fileInput.addEventListener('change', handleFileSelect);
    
    // Drop zone
    setupDropZone();
    
    // Service calculation
    const servicesContainer = document.getElementById('servicesContainer');
    if (servicesContainer) {
        servicesContainer.addEventListener('input', calculateTotal);
        servicesContainer.addEventListener('click', handleServiceActions);
    }
    
    // Settings modal
    const closeSettingsModal = document.getElementById('closeSettingsModal');
    const changeFolderBtn = document.getElementById('changeFolderBtn');
    const cleanupOldFiles = document.getElementById('cleanupOldFiles');
    if (closeSettingsModal) closeSettingsModal.addEventListener('click', hideSettingsModal);
    if (changeFolderBtn) changeFolderBtn.addEventListener('click', handleFolderSelect);
    if (cleanupOldFiles) cleanupOldFiles.addEventListener('click', handleCleanupFiles);
    
    // Confirmation modal
    const confirmYes = document.getElementById('confirmYes');
    const confirmNo = document.getElementById('confirmNo');
    if (confirmYes) confirmYes.addEventListener('click', handleConfirmYes);
    if (confirmNo) confirmNo.addEventListener('click', hideConfirmModal);
    
    // Modal click outside to close - only for non-setup modals
    document.addEventListener('click', function(e) {
        if (e.target.classList.contains('modal')) {
            if (e.target.id === 'patientModal') {
                hidePatientModal();
            } else if (e.target.id === 'confirmModal') {
                hideConfirmModal();
            } else if (e.target.id === 'settingsModal') {
                hideSettingsModal();
            }
            // Don't allow closing setup modal by clicking outside
        }
    });

    // Add Escape key handling for modals - but not for setup modal
    document.addEventListener('keydown', function(e) {
        if (e.key === 'Escape') {
            // Close any open modal except setup
            const openModal = document.querySelector('.modal.show');
            if (openModal && openModal.id !== 'setupModal') {
                if (openModal.id === 'patientModal') {
                    hidePatientModal();
                } else if (openModal.id === 'settingsModal') {
                    hideSettingsModal();
                } else if (openModal.id === 'confirmModal') {
                    hideConfirmModal();
                }
            }
        }
    });
}

// Setup Step Handlers
function handleStep1Next(e) {
    e.preventDefault();
    const username = document.getElementById('username');
    
    if (!username || !username.value.trim()) {
        showToast('⚠️ Inserisci un nome utente', 'warning');
        return;
    }
    
    showSetupStep(2);
}

function handleStep2Next(e) {
    e.preventDefault();
    const doctorName = document.getElementById('doctorName');
    const doctorAddress = document.getElementById('doctorAddress');
    const doctorPiva = document.getElementById('doctorPiva');
    const doctorCf = document.getElementById('doctorCf');
    
    if (!doctorName || !doctorName.value.trim() ||
        !doctorAddress || !doctorAddress.value.trim() ||
        !doctorPiva || !doctorPiva.value.trim() ||
        !doctorCf || !doctorCf.value.trim()) {
        showToast('⚠️ Compila tutti i campi richiesti', 'warning');
        return;
    }
    
    showSetupStep(3);
}

async function handleFolderSelect(e) {
    e.preventDefault();
    
    if (!folderManager.isSupported) {
        showToast('⚠️ Browser non supportato, uso localStorage come storage', 'warning');
        const folderPath = document.getElementById('folderPath');
        if (folderPath) {
            folderPath.textContent = 'localStorage (fallback)';
            folderPath.classList.add('selected');
        }
        return;
    }
    
    try {
        await folderManager.selectFolder();
        const folderInfo = await folderManager.getFolderInfo();
        
        if (folderInfo) {
            const folderPath = document.getElementById('folderPath');
            if (folderPath) {
                folderPath.textContent = folderInfo.name;
                folderPath.classList.add('selected');
            }
            
            showToast('✅ Cartella selezionata con successo!', 'success');
        }
    } catch (error) {
        console.error('Folder selection error:', error);
        
        if (error.message.includes('cancelled')) {
            showToast('ℹ️ Selezione cartella annullata - usando localStorage', 'info');
        } else {
            showToast('❌ Errore nella selezione - usando localStorage come fallback', 'warning');
        }
        
        // Set fallback message and allow continuation
        const folderPath = document.getElementById('folderPath');
        if (folderPath) {
            folderPath.textContent = 'localStorage (fallback)';
            folderPath.classList.add('selected');
        }
    }
}

async function handleSetupComplete(e) {
    e.preventDefault();
    
    const usernameField = document.getElementById('username');
    if (!usernameField) return;
    
    const username = usernameField.value.trim();
    const doctorData = {
        name: document.getElementById('doctorName')?.value.trim() || '',
        address: document.getElementById('doctorAddress')?.value.trim() || '',
        piva: document.getElementById('doctorPiva')?.value.trim() || '',
        cf: document.getElementById('doctorCf')?.value.trim() || '',
        professional_title: document.getElementById('doctorTitle')?.value.trim() || '',
        medical_order: document.getElementById('doctorOrder')?.value.trim() || ''
    };
    
    if (!username) {
        showToast('⚠️ Nome utente richiesto', 'warning');
        showSetupStep(1);
        return;
    }
    
    currentUser = username;
    currentUserData.user = username;
    currentUserData.doctorData = doctorData;
    currentUserData.metadata.exportDate = new Date().toISOString();
    
    localStorage.setItem('currentUser', currentUser);
    
    try {
        await saveUserData();
        hideSetupModal();
        updateUI();
        updateNavigation('generator');
        updateStorageInfo();
        
        if (folderManager.folderHandle) {
            showToast('✅ Configurazione completata! Dati salvati nella cartella selezionata.', 'success');
        } else {
            showToast('✅ Configurazione completata! Dati salvati localmente nel browser.', 'success');
        }
    } catch (error) {
        console.error('Setup completion error:', error);
        showToast('❌ Errore durante il salvataggio iniziale', 'error');
    }
}

// Settings Modal
function showSettingsModal() {
    const modal = document.getElementById('settingsModal');
    if (!modal) return;
    
    // Update current folder info
    const currentFolderPath = document.getElementById('currentFolderPath');
    if (currentFolderPath) {
        if (folderManager.folderHandle) {
            currentFolderPath.textContent = folderManager.folderHandle.name;
        } else {
            currentFolderPath.textContent = 'localStorage (memoria del browser)';
        }
    }
    
    // Update backup count
    updateBackupCount();
    
    modal.classList.add('show');
}

function hideSettingsModal() {
    const modal = document.getElementById('settingsModal');
    if (modal) {
        modal.classList.remove('show');
    }
}

async function updateBackupCount() {
    const backupCount = document.getElementById('backupCount');
    if (!backupCount) return;
    
    if (folderManager.folderHandle && currentUser) {
        const count = await folderManager.countBackupFiles(currentUser);
        backupCount.textContent = count;
    } else {
        backupCount.textContent = '1 (localStorage)';
    }
}

async function handleCleanupFiles() {
    if (!folderManager.folderHandle) {
        showToast('⚠️ Nessuna cartella configurata - usando localStorage', 'warning');
        return;
    }
    
    showConfirmModal(
        'Conferma Pulizia',
        'Eliminare i file di backup più vecchi? Verranno mantenuti gli ultimi 10 file.',
        async () => {
            try {
                const remainingCount = await folderManager.cleanupOldFiles(currentUser);
                showToast(`✅ Pulizia completata. File rimanenti: ${remainingCount}`, 'success');
                updateBackupCount();
            } catch (error) {
                console.error('Cleanup error:', error);
                showToast('❌ Errore durante la pulizia', 'error');
            }
        }
    );
}

// Navigation Management
function updateNavigation(page) {
    // Update tabs
    document.querySelectorAll('.nav-tab').forEach(tab => {
        tab.classList.remove('active');
    });
    const activeTab = document.getElementById(`${page}Tab`);
    if (activeTab) {
        activeTab.classList.add('active');
    }
    
    // Update pages
    document.querySelectorAll('.page-content').forEach(pageEl => {
        pageEl.classList.add('hidden');
    });
    const activePage = document.getElementById(`${page}Page`);
    if (activePage) {
        activePage.classList.remove('hidden');
    }
    
    if (page === 'management') {
        updateManagementPage();
    } else if (page === 'generator') {
        updatePatientSelect();
        updateInvoiceNumber();
    }
}

// UI Updates
function updateUI() {
    if (!currentUser) return;
    
    const currentUserElement = document.getElementById('currentUser');
    const versionInfoElement = document.getElementById('versionInfo');
    
    if (currentUserElement) {
        currentUserElement.textContent = `? ${currentUser}`;
    }
    if (versionInfoElement) {
        versionInfoElement.textContent = `v${currentUserData.metadata.version}`;
    }
    
    updatePatientSelect();
    updateInvoiceNumber();
    updateStorageInfo();
}

// Patient Management
function updatePatientSelect() {
    const select = document.getElementById('patientSelect');
    if (!select) return;
    
    select.innerHTML = '<option value="">Seleziona un paziente...</option>';
    
    currentUserData.patients.forEach(patient => {
        const option = document.createElement('option');
        option.value = patient.id;
        option.textContent = `${patient.title} ${patient.name}`;
        select.appendChild(option);
    });
}

function handlePatientSelect(e) {
    const patientId = parseInt(e.target.value);
    const patientInfo = document.getElementById('selectedPatientInfo');
    const patientDetails = document.getElementById('patientDetails');
    
    if (!patientInfo || !patientDetails) return;
    
    if (patientId) {
        const patient = currentUserData.patients.find(p => p.id === patientId);
        if (patient) {
            patientDetails.innerHTML = `
                <p><strong>Nome:</strong> ${patient.title} ${patient.name}</p>
                <p><strong>Indirizzo:</strong> ${patient.address}</p>
                <p><strong>Codice Fiscale:</strong> ${patient.tax_code}</p>
            `;
            patientInfo.classList.remove('hidden');
        }
    } else {
        patientInfo.classList.add('hidden');
    }
}

function showPatientModal(patient = null) {
    const modal = document.getElementById('patientModal');
    const title = document.getElementById('patientModalTitle');
    const form = document.getElementById('patientForm');
    
    if (!modal || !title || !form) return;
    
    if (patient) {
        title.textContent = 'Modifica Paziente';
        const fields = [
            { id: 'patientTitle', value: patient.title },
            { id: 'patientName', value: patient.name },
            { id: 'patientAddress', value: patient.address },
            { id: 'patientTaxCode', value: patient.tax_code }
        ];
        
        fields.forEach(field => {
            const element = document.getElementById(field.id);
            if (element) {
                element.value = field.value;
            }
        });
        
        form.dataset.patientId = patient.id;
    } else {
        title.textContent = 'Nuovo Paziente';
        form.reset();
        delete form.dataset.patientId;
    }
    
    modal.classList.add('show');
}

function hidePatientModal() {
    const modal = document.getElementById('patientModal');
    if (modal) {
        modal.classList.remove('show');
    }
}

async function handlePatientSubmit(e) {
    e.preventDefault();
    
    const patientData = {
        title: document.getElementById('patientTitle')?.value || '',
        name: document.getElementById('patientName')?.value.trim() || '',
        address: document.getElementById('patientAddress')?.value.trim() || '',
        tax_code: document.getElementById('patientTaxCode')?.value.trim().toUpperCase() || ''
    };
    
    // Validation
    if (!patientData.name || !patientData.address || !patientData.tax_code) {
        showToast('⚠️ Compila tutti i campi', 'warning');
        return;
    }
    
    const patientId = e.target.dataset.patientId;
    
    if (patientId) {
        // Update existing patient
        const patientIndex = currentUserData.patients.findIndex(p => p.id === parseInt(patientId));
        if (patientIndex !== -1) {
            currentUserData.patients[patientIndex] = { ...patientData, id: parseInt(patientId) };
            showToast('✅ Paziente aggiornato con successo!', 'success');
        }
    } else {
        // Add new patient
        const newId = Math.max(0, ...currentUserData.patients.map(p => p.id)) + 1;
        currentUserData.patients.push({ ...patientData, id: newId });
        showToast('✅ Paziente aggiunto con successo!', 'success');
    }
    
    await saveUserData();
    updatePatientSelect();
    hidePatientModal();
    updateManagementPage();
}

// Invoice Management
function updateInvoiceNumber() {
    const currentYear = new Date().getFullYear();
    const invoiceNumber = `${currentUserData.counters.invoice}/${currentYear}`;
    const invoiceNumberField = document.getElementById('invoiceNumber');
    if (invoiceNumberField) {
        invoiceNumberField.value = invoiceNumber;
    }
}

function setDefaultDate() {
    const today = new Date().toISOString().split('T')[0];
    const dateField = document.getElementById('invoiceDate');
    if (dateField) {
        dateField.value = today;
    }
}

function addServiceRow() {
    const container = document.getElementById('servicesContainer');
    if (!container) return;
    
    const serviceItem = document.createElement('div');
    serviceItem.className = 'service-item';
    serviceItem.innerHTML = `
        <div class="form-row">
            <div class="form-group flex-1">
                <label class="form-label">Descrizione:</label>
                <input type="text" class="form-control service-description" placeholder="Visita medica" required>
            </div>
            <div class="form-group">
                <label class="form-label">Quantità:</label>
                <input type="number" class="form-control service-quantity" min="1" value="1" required>
            </div>
            <div class="form-group">
                <label class="form-label">Prezzo (€):</label>
                <input type="number" class="form-control service-price" step="0.01" min="0" required>
            </div>
            <div class="form-group">
                <button type="button" class="btn btn--outline btn--sm remove-service">Rimuovi</button>
            </div>
        </div>
    `;
    
    container.appendChild(serviceItem);
    updateRemoveButtons();
    calculateTotal();
}

function handleServiceActions(e) {
    if (e.target.classList.contains('remove-service')) {
        e.target.closest('.service-item').remove();
        updateRemoveButtons();
        calculateTotal();
    }
}

function updateRemoveButtons() {
    const removeButtons = document.querySelectorAll('.remove-service');
    removeButtons.forEach((btn, index) => {
        btn.disabled = removeButtons.length === 1;
    });
}

function calculateTotal() {
    let total = 0;
    const serviceItems = document.querySelectorAll('.service-item');
    
    serviceItems.forEach(item => {
        const quantity = parseFloat(item.querySelector('.service-quantity')?.value) || 0;
        const price = parseFloat(item.querySelector('.service-price')?.value) || 0;
        total += quantity * price;
    });
    
    const totalElement = document.getElementById('totalAmount');
    if (totalElement) {
        totalElement.textContent = total.toFixed(2);
    }
}

async function handleInvoiceSubmit(e) {
    e.preventDefault();
    
    const patientSelect = document.getElementById('patientSelect');
    if (!patientSelect) return;
    
    const patientId = parseInt(patientSelect.value);
    if (!patientId) {
        showToast('⚠️ Seleziona un paziente', 'warning');
        return;
    }
    
    const patient = currentUserData.patients.find(p => p.id === patientId);
    const invoiceData = collectInvoiceData(patient);
    
    if (!invoiceData || invoiceData.services.length === 0) {
        showToast('⚠️ Aggiungi almeno un servizio', 'warning');
        return;
    }
    
    // Save invoice
    const invoiceId = Math.max(0, ...currentUserData.invoices.map(i => i.id)) + 1;
    currentUserData.invoices.push({
        id: invoiceId,
        ...invoiceData,
        createdAt: new Date().toISOString()
    });
    
    currentUserData.counters.invoice++;
    await saveUserData();
    
    // Generate PDF
    generatePDF(invoiceData);
    
    showToast('✅ Fattura generata con successo!', 'success');
    
    // Reset form
    resetInvoiceForm();
}

function resetInvoiceForm() {
    const form = document.getElementById('invoiceForm');
    if (form) {
        form.reset();
    }
    
    const patientSelect = document.getElementById('patientSelect');
    if (patientSelect) {
        patientSelect.value = '';
    }
    
    const selectedPatientInfo = document.getElementById('selectedPatientInfo');
    if (selectedPatientInfo) {
        selectedPatientInfo.classList.add('hidden');
    }
    
    updateInvoiceNumber();
    setDefaultDate();
    
    // Reset services to single row
    const container = document.getElementById('servicesContainer');
    if (container) {
        container.innerHTML = `
            <div class="service-item">
                <div class="form-row">
                    <div class="form-group flex-1">
                        <label class="form-label">Descrizione:</label>
                        <input type="text" class="form-control service-description" placeholder="Visita medica" required>
                    </div>
                    <div class="form-group">
                        <label class="form-label">Quantità:</label>
                        <input type="number" class="form-control service-quantity" min="1" value="1" required>
                    </div>
                    <div class="form-group">
                        <label class="form-label">Prezzo (€):</label>
                        <input type="number" class="form-control service-price" step="0.01" min="0" required>
                    </div>
                    <div class="form-group">
                        <button type="button" class="btn btn--outline btn--sm remove-service" disabled>Rimuovi</button>
                    </div>
                </div>
            </div>
        `;
    }
    calculateTotal();
}

function collectInvoiceData(patient) {
    const services = [];
    const serviceItems = document.querySelectorAll('.service-item');
    
    serviceItems.forEach(item => {
        const description = item.querySelector('.service-description')?.value.trim() || '';
        const quantity = parseInt(item.querySelector('.service-quantity')?.value) || 0;
        const price = parseFloat(item.querySelector('.service-price')?.value) || 0;
        
        if (description && quantity && price) {
            services.push({ description, quantity, price });
        }
    });
    
    if (services.length === 0) {
        return null;
    }
    
    const total = services.reduce((sum, service) => sum + (service.quantity * service.price), 0);
    
    const invoiceNumber = document.getElementById('invoiceNumber')?.value || '';
    const invoiceDate = document.getElementById('invoiceDate')?.value || '';
    
    return {
        number: invoiceNumber,
        date: invoiceDate,
        patient: patient,
        doctor: currentUserData.doctorData,
        services: services,
        total: total
    };
}

// PDF Generation
function generatePDF(invoiceData) {
    if (typeof window.jspdf === 'undefined') {
        showToast('❌ Libreria PDF non caricata', 'error');
        return;
    }
    
    const { jsPDF } = window.jspdf;
    const doc = new jsPDF();
    
    // Header
    doc.setFontSize(20);
    doc.text('FATTURA', 105, 30, { align: 'center' });
    
    // Invoice info
    doc.setFontSize(12);
    doc.text(`Numero: ${invoiceData.number}`, 20, 50);
    doc.text(`Data: ${new Date(invoiceData.date).toLocaleDateString('it-IT')}`, 20, 60);
    
    // Doctor info
    doc.text('PRESTATORE:', 20, 80);
    doc.setFontSize(10);
    doc.text(`${invoiceData.doctor.name}`, 20, 90);
    doc.text(`${invoiceData.doctor.professional_title}`, 20, 100);
    doc.text(`${invoiceData.doctor.address}`, 20, 110);
    doc.text(`P.IVA: ${invoiceData.doctor.piva}`, 20, 120);
    doc.text(`C.F: ${invoiceData.doctor.cf}`, 20, 130);
    doc.text(`${invoiceData.doctor.medical_order}`, 20, 140);
    
    // Patient info
    doc.setFontSize(12);
    doc.text('COMMITTENTE:', 120, 80);
    doc.setFontSize(10);
    doc.text(`${invoiceData.patient.title} ${invoiceData.patient.name}`, 120, 90);
    doc.text(`${invoiceData.patient.address}`, 120, 100);
    doc.text(`C.F: ${invoiceData.patient.tax_code}`, 120, 110);
    
    // Services table
    let yPos = 170;
    doc.setFontSize(12);
    doc.text('PRESTAZIONI:', 20, yPos);
    
    yPos += 10;
    doc.setFontSize(10);
    doc.text('Descrizione', 20, yPos);
    doc.text('Qnt', 120, yPos);
    doc.text('Prezzo', 140, yPos);
    doc.text('Totale', 170, yPos);
    doc.line(20, yPos + 2, 190, yPos + 2);
    
    yPos += 10;
    invoiceData.services.forEach(service => {
        const serviceTotal = service.quantity * service.price;
        doc.text(service.description, 20, yPos);
        doc.text(service.quantity.toString(), 120, yPos);
        doc.text(`€ ${service.price.toFixed(2)}`, 140, yPos);
        doc.text(`€ ${serviceTotal.toFixed(2)}`, 170, yPos);
        yPos += 10;
    });
    
    // Total
    doc.line(20, yPos, 190, yPos);
    yPos += 10;
    doc.setFontSize(12);
    doc.text(`TOTALE: € ${invoiceData.total.toFixed(2)}`, 170, yPos, { align: 'right' });
    
    // Legal text
    yPos += 20;
    doc.setFontSize(8);
    doc.text(legalText.iva_exemption, 20, yPos);
    yPos += 10;
    doc.text(legalText.stamp_duty, 20, yPos);
    yPos += 10;
    doc.text(legalText.fiscal_regime, 20, yPos, { maxWidth: 170 });
    
    // Download
    const filename = `Fattura_${invoiceData.number.replace('/', '_')}_${invoiceData.patient.name.replace(/\s+/g, '_')}.pdf`;
    doc.save(filename);
}

// Print Function
function handlePrint() {
    const patientSelect = document.getElementById('patientSelect');
    if (!patientSelect) return;
    
    const patientId = parseInt(patientSelect.value);
    if (!patientId) {
        showToast('⚠️ Seleziona un paziente per stampare', 'warning');
        return;
    }
    
    window.print();
}

// Export/Import System
function handleExport() {
    const timestamp = new Date().toISOString();
    const exportData = {
        ...currentUserData,
        metadata: {
            ...currentUserData.metadata,
            exportDate: timestamp
        }
    };
    
    const dateStr = new Date().toISOString().slice(0, 19).replace(/[T:]/g, '-');
    const filename = `Fatture_${currentUser}_${dateStr}.json`;
    const blob = new Blob([JSON.stringify(exportData, null, 2)], { type: 'application/json' });
    const url = URL.createObjectURL(blob);
    
    const a = document.createElement('a');
    a.href = url;
    a.download = filename;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);
    
    showToast(`✅ Copia extra esportata: ${filename}`, 'success');
}

function setupDropZone() {
    const dropZone = document.getElementById('dropZone');
    
    if (!dropZone) return;
    
    dropZone.addEventListener('click', () => {
        const fileInput = document.getElementById('fileInput');
        if (fileInput) {
            fileInput.click();
        }
    });
    
    dropZone.addEventListener('dragover', (e) => {
        e.preventDefault();
        dropZone.classList.add('drag-over');
    });
    
    dropZone.addEventListener('dragleave', () => {
        dropZone.classList.remove('drag-over');
    });
    
    dropZone.addEventListener('drop', (e) => {
        e.preventDefault();
        dropZone.classList.remove('drag-over');
        
        const files = e.dataTransfer.files;
        if (files.length > 0) {
            handleFileImport(files[0]);
        }
    });
}

function handleFileSelect(e) {
    const file = e.target.files[0];
    if (file) {
        handleFileImport(file);
    }
}

function handleFileImport(file) {
    if (!file.name.endsWith('.json')) {
        showToast('⚠️ Seleziona un file JSON valido', 'warning');
        return;
    }
    
    const reader = new FileReader();
    reader.onload = (e) => {
        try {
            const importData = JSON.parse(e.target.result);
            smartImport(importData);
        } catch (error) {
            showToast('❌ File JSON non valido', 'error');
            console.error('Import error:', error);
        }
    };
    reader.readAsText(file);
}

async function smartImport(importData) {
    // Validate import data structure
    if (!importData.user && !importData.userData) {
        showToast('❌ Struttura file non valida', 'error');
        return;
    }
    
    // Handle different data formats
    let dataToImport;
    if (importData.userData) {
        // New format with metadata wrapper
        dataToImport = importData.userData;
    } else {
        // Old format direct data
        dataToImport = importData;
    }
    
    // Get local data
    const localMetadata = currentUserData.metadata || {};
    const importMetadata = dataToImport.metadata || {};
    
    const localDate = new Date(localMetadata.exportDate || 0);
    const importDate = new Date(importMetadata.exportDate || 0);
    
    if (importDate > localDate) {
        // Auto import - newer data
        await performImport(dataToImport);
        showToast('✅ Import automatico: dati più recenti importati', 'success');
    } else if (importDate < localDate) {
        // Skip - older data
        showToast('ℹ️ Import saltato: dati locali più recenti', 'info');
    } else {
        // Same date - ask user
        showConfirmModal(
            'Conferma Import',
            'Stessa data rilevata. Importare comunque i dati?',
            async () => {
                await performImport(dataToImport);
                showToast('✅ Dati importati manualmente', 'success');
            }
        );
    }
}

async function performImport(importData) {
    currentUserData = {
        ...importData,
        metadata: {
            ...importData.metadata,
            lastModified: new Date().toISOString()
        }
    };
    
    await saveUserData();
    updateUI();
    updateManagementPage();
    
    const summary = `Pazienti: ${importData.patients?.length || 0}, Fatture: ${importData.invoices?.length || 0}`;
    showToast(`Import completato! ${summary}`, 'success');
}

// Management Page
function updateManagementPage() {
    updatePatientsTable();
    updateInvoicesTable();
    updateStatistics();
}

function updatePatientsTable() {
    const container = document.getElementById('patientsTable');
    if (!container) return;
    
    if (currentUserData.patients.length === 0) {
        container.innerHTML = `
            <div class="empty-state">
                <div class="empty-state-icon">?</div>
                <h3>Nessun paziente</h3>
                <p>Aggiungi il tuo primo paziente per iniziare</p>
                <button class="btn btn--primary" onclick="showPatientModal()">+ Aggiungi Paziente</button>
            </div>
        `;
        return;
    }
    
    const table = document.createElement('table');
    table.className = 'data-table';
    table.innerHTML = `
        <thead>
            <tr>
                <th>Nome</th>
                <th>Indirizzo</th>
                <th>Codice Fiscale</th>
                <th>Azioni</th>
            </tr>
        </thead>
        <tbody>
            ${currentUserData.patients.map(patient => `
                <tr>
                    <td>${patient.title} ${patient.name}</td>
                    <td>${patient.address}</td>
                    <td>${patient.tax_code}</td>
                    <td class="table-actions">
                        <button class="btn btn--outline btn--sm" onclick="editPatient(${patient.id})">Modifica</button>
                        <button class="btn btn--outline btn--sm" onclick="deletePatient(${patient.id})">Elimina</button>
                    </td>
                </tr>
            `).join('')}
        </tbody>
    `;
    
    container.innerHTML = '';
    container.appendChild(table);
}

function updateInvoicesTable() {
    const container = document.getElementById('invoicesTable');
    if (!container) return;
    
    if (currentUserData.invoices.length === 0) {
        container.innerHTML = `
            <div class="empty-state">
                <div class="empty-state-icon">?</div>
                <h3>Nessuna fattura</h3>
                <p>Le tue fatture appariranno qui</p>
            </div>
        `;
        return;
    }
    
    const table = document.createElement('table');
    table.className = 'data-table';
    table.innerHTML = `
        <thead>
            <tr>
                <th>Numero</th>
                <th>Data</th>
                <th>Paziente</th>
                <th>Totale</th>
                <th>Azioni</th>
            </tr>
        </thead>
        <tbody>
            ${currentUserData.invoices.map(invoice => `
                <tr>
                    <td>${invoice.number}</td>
                    <td>${new Date(invoice.date).toLocaleDateString('it-IT')}</td>
                    <td>${invoice.patient.title} ${invoice.patient.name}</td>
                    <td>€ ${invoice.total.toFixed(2)}</td>
                    <td class="table-actions">
                        <button class="btn btn--outline btn--sm" onclick="regeneratePDF(${invoice.id})">PDF</button>
                        <button class="btn btn--outline btn--sm" onclick="deleteInvoice(${invoice.id})">Elimina</button>
                    </td>
                </tr>
            `).join('')}
        </tbody>
    `;
    
    container.innerHTML = '';
    container.appendChild(table);
}

function updateStatistics() {
    const currentYear = new Date().getFullYear();
    const yearlyInvoices = currentUserData.invoices.filter(inv => 
        new Date(inv.date).getFullYear() === currentYear
    );
    const yearlyRevenue = yearlyInvoices.reduce((sum, inv) => sum + inv.total, 0);
    
    const totalPatients = document.getElementById('totalPatients');
    const totalInvoices = document.getElementById('totalInvoices');
    const yearlyRevenueElement = document.getElementById('yearlyRevenue');
    
    if (totalPatients) totalPatients.textContent = currentUserData.patients.length;
    if (totalInvoices) totalInvoices.textContent = currentUserData.invoices.length;
    if (yearlyRevenueElement) yearlyRevenueElement.textContent = `€ ${yearlyRevenue.toFixed(2)}`;
    
    // Update current file name
    const currentFileElement = document.getElementById('currentFileName');
    if (currentFileElement) {
        if (currentFileName) {
            currentFileElement.textContent = currentFileName.substring(0, 20) + '...';
            currentFileElement.title = currentFileName;
        } else {
            currentFileElement.textContent = 'localStorage';
        }
    }
}

// Management Actions
function editPatient(patientId) {
    const patient = currentUserData.patients.find(p => p.id === patientId);
    if (patient) {
        showPatientModal(patient);
    }
}

async function deletePatient(patientId) {
    showConfirmModal(
        'Conferma Eliminazione',
        'Sei sicuro di voler eliminare questo paziente? Le fatture associate rimarranno invariate.',
        async () => {
            currentUserData.patients = currentUserData.patients.filter(p => p.id !== patientId);
            await saveUserData();
            updateManagementPage();
            updatePatientSelect();
            showToast('✅ Paziente eliminato', 'success');
        }
    );
}

async function deleteInvoice(invoiceId) {
    showConfirmModal(
        'Conferma Eliminazione',
        'Sei sicuro di voler eliminare questa fattura?',
        async () => {
            currentUserData.invoices = currentUserData.invoices.filter(i => i.id !== invoiceId);
            await saveUserData();
            updateManagementPage();
            showToast('✅ Fattura eliminata', 'success');
        }
    );
}

function regeneratePDF(invoiceId) {
    const invoice = currentUserData.invoices.find(i => i.id === invoiceId);
    if (invoice) {
        generatePDF(invoice);
        showToast('✅ PDF rigenerato', 'success');
    }
}

// Modal Management
function showConfirmModal(title, message, onConfirm) {
    const confirmTitle = document.getElementById('confirmTitle');
    const confirmMessage = document.getElementById('confirmMessage');
    const confirmModal = document.getElementById('confirmModal');
    
    if (confirmTitle) confirmTitle.textContent = title;
    if (confirmMessage) confirmMessage.textContent = message;
    if (confirmModal) confirmModal.classList.add('show');
    
    // Store callback
    window.pendingConfirmAction = onConfirm;
}

function hideConfirmModal() {
    const confirmModal = document.getElementById('confirmModal');
    if (confirmModal) {
        confirmModal.classList.remove('show');
    }
    delete window.pendingConfirmAction;
}

function handleConfirmYes() {
    if (window.pendingConfirmAction) {
        window.pendingConfirmAction();
    }
    hideConfirmModal();
}

// Toast Notifications
function showToast(message, type = 'info') {
    const container = document.getElementById('toast-container');
    if (!container) return;
    
    const toast = document.createElement('div');
    toast.className = `toast toast--${type}`;
    
    const icons = {
        success: '✅',
        error: '❌',
        warning: '⚠️',
        info: 'ℹ️'
    };
    
    toast.innerHTML = `
        <div class="toast-content">
            <span class="toast-icon">${icons[type]}</span>
            <span class="toast-text">${message}</span>
            <button class="toast-close">×</button>
        </div>
    `;
    
    // Close button
    toast.querySelector('.toast-close').addEventListener('click', () => {
        removeToast(toast);
    });
    
    container.appendChild(toast);
    
    // Show toast
    setTimeout(() => toast.classList.add('show'), 100);
    
    // Auto hide
    setTimeout(() => removeToast(toast), 5000);
}

function removeToast(toast) {
    toast.classList.remove('show');
    setTimeout(() => {
        if (toast.parentNode) {
            toast.parentNode.removeChild(toast);
        }
    }, 300);
}

// Logout
function handleLogout() {
    showConfirmModal(
        'Conferma Logout',
        'Sei sicuro di voler uscire? Tutti i dati sono salvati automaticamente.',
        () => {
            localStorage.removeItem('currentUser');
            localStorage.removeItem('folderHandle');
            location.reload();
        }
    );
}

// Global functions for onclick handlers
window.editPatient = editPatient;
window.deletePatient = deletePatient;
window.deleteInvoice = deleteInvoice;
window.regeneratePDF = regeneratePDF;
window.showPatientModal = showPatientModal;

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