/* ===================================
   PUNTO DE VENTA - MINIMARKET CHILE
   Estilos CSS Principales
   =================================== */

:root {
    /* Colores principales */
    --primary-color: #2e7d32;
    --primary-dark: #1b5e20;
    --primary-light: #4caf50;
    --secondary-color: #ff6f00;
    --accent-color: #1976d2;
    
    /* Colores de fondo */
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-dark: #37474f;
    
    /* Colores de texto */
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-light: #ffffff;
    
    /* Colores de estado */
    --success: #4caf50;
    --warning: #ff9800;
    --error: #f44336;
    --info: #2196f3;
    
    /* Espaciado */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Bordes y sombras */
    --border-radius: 8px;
    --box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    --box-shadow-lg: 0 4px 16px rgba(0,0,0,0.15);
    
    /* Transiciones */
    --transition: all 0.3s ease;
}

/* Reset y estilos base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Encabezado */
header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: var(--text-light);
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 2.5rem;
}

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

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.9rem;
}

.info-icon {
    font-size: 1.2rem;
}

/* Navegación */
nav {
    background-color: var(--bg-dark);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 72px;
    z-index: 99;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0 var(--spacing-lg);
}

.nav-btn {
    background-color: transparent;
    border: none;
    color: var(--text-light);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-btn:hover {
    background-color: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

.nav-btn.active {
    background-color: var(--primary-light);
    font-weight: bold;
}

/* Contenedor principal */
main {
    max-width: 1400px;
    margin: var(--spacing-lg) auto;
    padding: 0 var(--spacing-lg);
    display: none;
}

main.active {
    display: block;
}

/* Sección de POS */
.pos-container {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--spacing-lg);
}

/* Buscador y filtros */
.search-section {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: var(--spacing-lg);
}

.search-bar {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.search-input {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.category-filters {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--primary-color);
    background-color: transparent;
    color: var(--primary-color);
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.filter-btn:hover {
    background-color: var(--primary-light);
    color: white;
    transform: translateY(-2px);
}

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

/* Catálogo de productos */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.product-card {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--box-shadow-lg);
}

.product-image {
    width: 100%;
    height: 150px;
    background: linear-gradient(135deg, #e0e0e0 0%, #f5f5f5 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: var(--text-secondary);
}

.product-info {
    padding: var(--spacing-md);
}

.product-name {
    font-size: 1rem;
    font-weight: bold;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.product-category {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.product-price {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.product-stock {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.product-stock.low {
    color: var(--warning);
}

.product-stock.out {
    color: var(--error);
}

/* Carrito de compras */
.cart-section {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-lg);
    height: fit-content;
    position: sticky;
    top: 180px;
}

.cart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid #eee;
}

.cart-title {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--primary-dark);
}

.cart-count {
    background-color: var(--secondary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 20px;
    font-weight: bold;
}

.cart-items {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: var(--spacing-lg);
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid #eee;
}

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

.cart-item-name {
    font-size: 0.9rem;
    font-weight: bold;
    margin-bottom: var(--spacing-xs);
}

.cart-item-price {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.cart-btn {
    width: 28px;
    height: 28px;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.cart-btn.minus {
    background-color: var(--error);
    color: white;
}

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

.cart-btn:hover {
    transform: scale(1.1);
}

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

.cart-total {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
}

.total-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.total-row.final {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--primary-dark);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 2px solid #ddd;
}

.checkout-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.checkout-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
}

.checkout-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
}

.clear-cart-btn {
    width: 100%;
    padding: var(--spacing-sm);
    background-color: transparent;
    color: var(--error);
    border: 2px solid var(--error);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
}

.clear-cart-btn:hover {
    background-color: var(--error);
    color: white;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: white;
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: bold;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    transform: rotate(90deg);
}

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 2px solid #eee;
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

/* Formularios */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: bold;
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

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

.form-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    background-color: white;
    cursor: pointer;
}

.btn-primary {
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

.btn-secondary {
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--text-secondary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

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

/* Gestión de inventario */
.inventory-section {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-xl);
}

.inventory-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.inventory-title {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-dark);
}

.add-product-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.products-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-lg);
}

.products-table th,
.products-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid #eee;
}

.products-table th {
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
}

.products-table tr:hover {
    background-color: var(--bg-primary);
}

.action-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    margin-right: var(--spacing-xs);
    transition: var(--transition);
}

.action-btn.edit {
    background-color: var(--accent-color);
    color: white;
}

.action-btn.delete {
    background-color: var(--error);
    color: white;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

/* Reportes */
.reports-section {
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-xl);
}

.reports-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.reports-title {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-dark);
}

.reports-filters {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.stat-card.secondary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-dark) 100%);
}

.stat-card.tertiary {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #e65100 100%);
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
}

.sales-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-lg);
}

.sales-table th,
.sales-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid #eee;
}

.sales-table th {
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
}

.sales-table tr:hover {
    background-color: var(--bg-primary);
}

/* Responsive */
@media (max-width: 1024px) {
    .pos-container {
        grid-template-columns: 1fr;
    }
    
    .cart-section {
        position: static;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .header-info {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .nav-container {
        flex-wrap: wrap;
    }
    
    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
    
    .product-image {
        height: 120px;
        font-size: 3rem;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.5rem;
    }
    
    .nav-btn {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
}

/* Utilidades */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state-text {
    font-size: 1.1rem;
}

.badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: bold;
}

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

.badge-warning {
    background-color: var(--warning);
    color: white;
}

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

/* --- ALERTA DE VENCIMIENTOS & SEMÁFORO --- */
.expiration-warning-box {
    background-color: #fff9c4;
    border: 2px solid #fbc02d;
    color: #bf360c;
    padding: 10px 15px;
    border-radius: 12px;
    margin-left: 20px;
    flex: 1;
    min-width: 250px;
    max-height: 120px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.expiration-warning-box h4 { margin: 0 0 5px 0; font-size: 0.95rem; font-weight: bold; }
.expiration-warning-box ul { margin: 0; padding-left: 20px; font-size: 0.85rem; }

/* Animación de Latido (Pulse) para el botón rojo */
@keyframes pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(244, 67, 54, 0.7); }
    70% { transform: scale(1.1); box-shadow: 0 0 0 10px rgba(244, 67, 54, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(244, 67, 54, 0); }
}

@media (max-width: 768px) {
    .expiration-warning-box { margin-left: 0; margin-top: 15px; width: 100%; }
}