/* ===== VARIABLES CSS ===== */
:root {
    /* Colores principales */
    --primary-color: #2563eb;
    --success-color: #22c55e;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    
    /* Colores de fondo */
    --bg-primary: #ffffff;
    --bg-secondary: #f3f4f6;
    --bg-tertiary: #e5e7eb;
    
    /* Colores de texto */
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    
    /* Bordes */
    --border-color: #d1d5db;
    --border-radius: 8px;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* Transiciones */
    --transition: all 0.3s ease;
}

/* ===== MODO OSCURO ===== */
body.dark-mode {
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-light: #9ca3af;
    --border-color: #4b5563;
}

/* ===== RESET Y BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: var(--transition);
}

/* ===== PANTALLA DE LOGIN ===== */
.login-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
    padding: 20px;
}

.login-container {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 28px;
    margin-bottom: 8px;
    color: var(--primary-color);
}

.login-header p {
    color: var(--text-secondary);
}

.login-form .form-group {
    margin-bottom: 20px;
}

.login-footer {
    margin-top: 20px;
    text-align: center;
}

.online-indicator {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 14px;
    color: var(--text-secondary);
}

.online-indicator.offline {
    color: var(--danger-color);
}

/* ===== CONTENEDOR PRINCIPAL ===== */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== HEADER ===== */
.app-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header-left h1 {
    font-size: 24px;
    color: var(--primary-color);
}

.user-info {
    color: var(--text-secondary);
    font-size: 14px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* ===== BOTONES ===== */
.btn-primary, .btn-secondary, .btn-success, .btn-danger, .btn-icon {
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    background: #16a34a;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    justify-content: center;
    background: var(--bg-secondary);
    position: relative;
}

.btn-large {
    width: 100%;
    padding: 15px;
    font-size: 16px;
}

/* ===== NOTIFICACIONES ===== */
.notification-btn {
    position: relative;
}

.notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--danger-color);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    font-size: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.notification-panel {
    position: fixed;
    top: 70px;
    right: 20px;
    width: 350px;
    max-height: 500px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    overflow: hidden;
}

.notification-header {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notification-list {
    max-height: 400px;
    overflow-y: auto;
}

.notification-item {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.notification-item:hover {
    background: var(--bg-secondary);
}

.notification-item.unread {
    background: rgba(37, 99, 235, 0.05);
    border-left: 3px solid var(--primary-color);
}

.notification-item.warning {
    border-left: 3px solid var(--warning-color);
}

.notification-item.danger {
    border-left: 3px solid var(--danger-color);
}

/* ===== NAVEGACIÓN TABS ===== */
.tab-navigation {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    overflow-x: auto;
    padding: 0 30px;
}

.tab-btn {
    padding: 15px 25px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    white-space: nowrap;
    font-size: 14px;
    font-weight: 500;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

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

/* ===== CONTENIDO PRINCIPAL ===== */
.main-content {
    flex: 1;
    padding: 30px;
}

.tab-content {
    display: none !important;
}

.tab-content.active {
    display: block !important;
}

/* ===== DASHBOARD ===== */
.dashboard-grid {
    display: grid;
    gap: 20px;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.stat-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-icon {
    font-size: 40px;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
}

.stat-info h3 {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.stat-value {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

/* ===== ALERTAS ===== */
.alerts-section {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.alerts-container {
    display: grid;
    gap: 15px;
    margin-top: 15px;
}

.alert {
    padding: 15px;
    border-radius: var(--border-radius);
    border-left: 4px solid;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert.warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--warning-color);
    color: #92400e;
}

.alert.danger {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--danger-color);
    color: #991b1b;
}

body.dark-mode .alert.warning {
    color: #fbbf24;
}

body.dark-mode .alert.danger {
    color: #fca5a5;
}

/* ===== GRÁFICOS ===== */
.charts-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.chart-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.chart-card h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

/* ===== PRODUCTOS MÁS VENDIDOS ===== */
.top-products-section {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.top-productos-list {
    margin-top: 15px;
    display: grid;
    gap: 10px;
}

.top-producto-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
}

/* ===== PUNTO DE VENTA ===== */
.pos-layout {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 20px;
    height: calc(100vh - 200px);
}

.pos-products {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    overflow: hidden;
}

.search-bar input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 14px;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.category-filters {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.category-btn {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 13px;
}

.category-btn:hover, .category-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.products-grid {
    flex: 1;
    overflow-y: auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    padding: 5px;
}

.product-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 15px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.product-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.product-card.out-of-stock {
    opacity: 0.5;
    cursor: not-allowed;
}

.product-name {
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.product-price {
    color: var(--primary-color);
    font-size: 18px;
    font-weight: bold;
}

.product-stock {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* ===== CARRITO ===== */
.pos-cart {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.cart-items {
    flex: 1;
    overflow-y: auto;
    margin: 15px 0;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    margin-bottom: 10px;
}

.cart-item-info {
    flex: 1;
}

.cart-item-name {
    font-weight: 500;
    margin-bottom: 4px;
}

.cart-item-price {
    color: var(--text-secondary);
    font-size: 14px;
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.qty-btn {
    width: 30px;
    height: 30px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.qty-display {
    min-width: 30px;
    text-align: center;
    font-weight: bold;
}

.remove-btn {
    color: var(--danger-color);
    cursor: pointer;
    font-size: 18px;
}

.cart-summary {
    border-top: 2px solid var(--border-color);
    padding-top: 15px;
}

.cart-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 15px;
}

.cart-total span:last-child {
    color: var(--primary-color);
}

/* ===== CUENTAS POR COBRAR ===== */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.cuentas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.cuenta-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: var(--transition);
    border-left: 4px solid var(--success-color);
}

.cuenta-card.morosa {
    border-left-color: var(--danger-color);
}

.cuenta-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.cuenta-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 15px;
}

.cuenta-nombre {
    font-size: 18px;
    font-weight: bold;
    color: var(--text-primary);
}

.cuenta-saldo {
    font-size: 20px;
    font-weight: bold;
    color: var(--danger-color);
}

.cuenta-info {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 10px;
}

.cuenta-acciones {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

/* ===== REPORTES ===== */
.report-controls {
    display: flex;
    gap: 10px;
}

.select-input {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
}

.report-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.transactions-list {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
}

.transaction-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

.transaction-item:last-child {
    border-bottom: none;
}

.transaction-info h4 {
    margin-bottom: 5px;
}

.transaction-meta {
    font-size: 13px;
    color: var(--text-secondary);
}

.transaction-amount {
    font-size: 18px;
    font-weight: bold;
    color: var(--success-color);
}

.transaction-actions {
    display: flex;
    gap: 10px;
}

/* ===== INVENTARIO ===== */
.inventory-table {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background: var(--bg-secondary);
}

th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

tbody tr:hover {
    background: var(--bg-secondary);
}

.margen-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: bold;
}

.margen-alto {
    background: rgba(34, 197, 94, 0.2);
    color: var(--success-color);
}

.margen-medio {
    background: rgba(245, 158, 11, 0.2);
    color: var(--warning-color);
}

.margen-bajo {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
}

/* ===== GASTOS ===== */
.gastos-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.gastos-list {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
}

.gasto-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

/* ===== CAJA ===== */
.caja-status {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 20px;
}

.caja-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 15px;
}

.caja-movimientos {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
}

/* ===== USUARIOS ===== */
.usuarios-list {
    display: grid;
    gap: 15px;
}

.usuario-item {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.usuario-info h3 {
    margin-bottom: 5px;
}

.usuario-rol {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: bold;
    background: rgba(37, 99, 235, 0.2);
    color: var(--primary-color);
}

/* ===== MODALES ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    overflow-y: auto;
    padding: 20px;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-large {
    max-width: 800px;
}

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

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.close-modal {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
}

/* ===== FORMULARIOS ===== */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 14px;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* ===== PAGO ===== */
.payment-summary {
    background: var(--bg-secondary);
    padding: 15px;
    border-radius: var(--border-radius);
    text-align: center;
    margin-bottom: 20px;
}

.payment-summary h3 {
    font-size: 20px;
}

.payment-summary span {
    color: var(--primary-color);
    font-size: 28px;
    font-weight: bold;
}

.pago-section {
    margin-top: 15px;
}

.mixto-validation {
    margin-top: 10px;
    padding: 10px;
    border-radius: var(--border-radius);
    font-size: 14px;
}

.mixto-validation.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.mixto-validation.success {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success-color);
}

/* ===== CUENTA DETALLE ===== */
.cuenta-transacciones {
    margin-top: 20px;
}

.cuenta-actions {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.transaccion-item {
    padding: 15px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.transaccion-tipo {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: bold;
}

.transaccion-tipo.compra {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
}

.transaccion-tipo.pago {
    background: rgba(34, 197, 94, 0.2);
    color: var(--success-color);
}

/* ===== BACKUP ===== */
.backup-section {
    margin: 20px 0;
}

.backup-section h3 {
    margin-bottom: 10px;
}

.backup-section p {
    color: var(--text-secondary);
    margin-bottom: 15px;
}

/* ===== FAB ===== */
.fab {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    font-size: 24px;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    z-index: 999;
}

.fab:hover {
    transform: scale(1.1);
    box-shadow: 0 15px 25px -5px rgba(0, 0, 0, 0.3);
}

/* ===== TOAST ===== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 15px 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.toast.show {
    opacity: 1;
}

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

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

/* ===== UTILIDADES ===== */
.admin-only {
    display: none;
}

body.is-admin .admin-only {
    display: block;
}

/* IMPORTANTE: Los tabs admin-only siguen la lógica de tabs */
body.is-admin .tab-content.admin-only {
    display: none;
}

body.is-admin .tab-content.admin-only.active {
    display: block !important;
}

body.is-admin .tab-btn.admin-only {
    display: inline-block;
}

body.is-admin .stat-card.admin-only,
body.is-admin .alerts-section.admin-only {
    display: flex;
}

body.is-admin .fab.admin-only {
    display: block;
}

.info-text {
    color: var(--text-secondary);
    font-size: 14px;
    font-style: italic;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        gap: 15px;
        padding: 15px;
    }
    
    .header-left, .header-right {
        width: 100%;
        justify-content: space-between;
    }
    
    .tab-navigation {
        padding: 0 15px;
    }
    
    .main-content {
        padding: 15px;
    }
    
    .pos-layout {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .pos-cart {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        max-height: 50vh;
        border-radius: var(--border-radius) var(--border-radius) 0 0;
        z-index: 100;
    }
    
    .stats-row {
        grid-template-columns: 1fr;
    }
    
    .charts-section {
        grid-template-columns: 1fr;
    }
    
    .cuentas-grid {
        grid-template-columns: 1fr;
    }
    
    .report-controls {
        flex-direction: column;
    }
    
    .modal-content {
        margin: 20px;
    }
    
    table {
        font-size: 12px;
    }
    
    th, td {
        padding: 8px;
    }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

.designer-credit {
    position: fixed;
    bottom: 12px;
    right: 15px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 13px;
    font-weight: 300;
    color: #000000;
    background-color: rgba(255, 255, 255, 0.85);
    padding: 6px 12px;
    border-radius: 6px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    letter-spacing: 0.5px;
}

/* Responsive para móviles */
@media (max-width: 768px) {
    .pos-container {
        padding: 10px;
    }

    .header {
        flex-direction: column;
        gap: 10px;
        padding: 10px;
    }

    .header h1 {
        font-size: 24px;
    }

    .user-info {
        font-size: 12px;
    }

    .main-content {
        flex-direction: column;
    }

    .products-section {
        width: 100%;
        margin-bottom: 20px;
    }

    .search-bar input {
        font-size: 14px;
        padding: 10px;
    }

    .category-filters {
        overflow-x: auto;
        flex-wrap: nowrap;
        gap: 8px;
        padding-bottom: 10px;
    }

    .category-btn {
        min-width: 100px;
        font-size: 13px;
        padding: 8px 15px;
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .product-card {
        padding: 10px;
    }

    .product-card h3 {
        font-size: 14px;
    }

    .product-card .price {
        font-size: 16px;
    }

    .add-btn {
        font-size: 13px;
        padding: 8px;
    }

    .cart-section {
        width: 100%;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        max-height: 40vh;
        border-radius: 20px 20px 0 0;
        box-shadow: 0 -4px 20px rgba(0,0,0,0.2);
    }

    .cart-section h2 {
        font-size: 18px;
        padding: 15px;
        margin: 0;
    }

    .cart-items {
        max-height: 25vh;
        overflow-y: auto;
    }

    .cart-item {
        padding: 10px;
        font-size: 13px;
    }

    .cart-total {
        font-size: 20px;
        padding: 15px;
    }

    .checkout-btn, .clear-btn {
        font-size: 16px;
        padding: 15px;
        margin: 10px;
    }

    body {
        padding-bottom: 300px;
    }
}

@media (max-width: 480px) {
    .products-grid {
        grid-template-columns: 1fr;
    }

    .header h1 {
        font-size: 20px;
    }
}
/* ========================================
   ESTILOS PARA MODO OFFLINE
   ======================================== */

/* Indicador de estado de conexión mejorado */
.online-indicator {
    font-size: 13px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 20px;
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.online-indicator.offline {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
    animation: pulse-warning 2s infinite;
}

@keyframes pulse-warning {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(0.98);
    }
}

/* Badge de sincronización */
.sync-badge {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    color: white;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: bold;
    min-width: 20px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(245, 158, 11, 0.3);
    animation: pulse-sync 2s infinite;
}

@keyframes pulse-sync {
    0%, 100% {
        opacity: 1;
        box-shadow: 0 2px 4px rgba(245, 158, 11, 0.3);
    }
    50% {
        opacity: 0.7;
        box-shadow: 0 4px 8px rgba(245, 158, 11, 0.5);
    }
}

/* Botón de sincronización manual */
.btn-sync {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: white;
    border: none;
    padding: 8px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 14px;
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(59, 130, 246, 0.3);
}

.btn-sync:hover {
    transform: rotate(180deg) scale(1.1);
    box-shadow: 0 4px 8px rgba(59, 130, 246, 0.5);
}

.btn-sync:active {
    transform: rotate(180deg) scale(0.95);
}

.btn-sync.syncing {
    animation: spin 1s linear infinite;
    pointer-events: none;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Responsive para móviles */
@media (max-width: 768px) {
    .online-indicator {
        font-size: 11px;
        padding: 4px 10px;
    }
    
    .sync-badge {
        font-size: 10px;
        padding: 3px 8px;
    }
    
    .btn-sync {
        width: 28px;
        height: 28px;
        font-size: 12px;
    }
}