:root {
  --bg-main: #090d16;
  --bg-panel: #111a2e;
  --bg-card: #1b2640;
  --text-primary: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-hover: #0ea5e9;
  --success: #10b981;
  --success-hover: #059669;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --border: #24355a;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg-main);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

* {
  box-sizing: border-box;
}

/* Header & Navegación */
.app-header {
  padding: 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.header-brand h1 {
  margin: 0;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.header-brand p {
  margin: 4px 0 0 0;
  font-size: 14px;
  color: var(--text-muted);
}

.top-nav {
  display: flex;
  gap: 8px;
  flex-wrap: nowrap;          /* REEMPLAZADO: Evita que los botones bajen a la siguiente fila */
  overflow-x: auto;           /* NUEVO: Permite scroll horizontal si los botones no caben en la pantalla */
  -webkit-overflow-scrolling: touch; /* NUEVO: Desplazamiento suave y responsivo en iOS */
  scrollbar-width: none;      /* NUEVO: Oculta la barra de scroll en Firefox */
  padding-bottom: 4px;        /* NUEVO: Pequeño margen para evitar cortes visuales al scrollear */
}

/* NUEVO: Oculta la barra de scroll en Chrome, Safari y Edge para mantener una estética limpia */
.top-nav::-webkit-scrollbar {
  display: none;
}

.nav-btn {
  border: none;
  padding: 10px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  background: var(--bg-card);
  color: var(--text-muted);
  transition: all 0.2s ease;
  
  /* CAMBIOS AQUÍ */
  flex: 1;            /* Hace que cada botón crezca por igual hasta llenar el ancho de la pantalla */
  text-align: center; /* Asegura que el texto y el emoji queden perfectamente centrados */
}

.nav-btn:hover {
  color: var(--text-primary);
  background: #243356;
}

.nav-btn.active {
  background: var(--accent);
  color: #090d16;
}

/* Main Layout */
.app-main {
  padding: 20px;
  max-width: 1400px;
  margin: 0 auto;
}

.view {
  display: none;
  animation: fadeIn 0.25s ease;
}

.view.active {
  display: block;
}

.panel {
  background: var(--bg-panel);
  border-radius: 16px;
  padding: 20px;
  border: 1px solid var(--border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
}

.panel-header {
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.panel-header h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.panel-header small {
  color: var(--text-muted);
  font-size: 13px;
}

/* Catálogo de Productos */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.product-card {
  background: var(--bg-card);
  border-radius: 14px;
  overflow: hidden;
  cursor: pointer;
  border: 1px solid transparent;
  position: relative;
  transition: all 0.2s ease;
}

.product-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 6px 15px rgba(56, 189, 248, 0.15);
}

.product-card img {
  width: 100%;
  height: 110px;
  object-fit: cover;
  background: #0d1527;
}

.product-card .content {
  padding: 12px;
}

.product-card h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.product-card .price {
  margin: 6px 0 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
}

.badge-stock {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(9, 13, 22, 0.75);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: bold;
  backdrop-filter: blur(4px);
}

.badge-stock.out-of-stock {
  background: var(--danger);
  color: white;
}

/* Botón Flotante del Ticket (Mejora Requerida 1) */
.floating-ticket-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  cursor: pointer;
  box-shadow: 0 8px 32px rgba(56, 189, 248, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transform: scale(0);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.floating-ticket-btn.visible {
  transform: scale(1);
}

.floating-ticket-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}

.floating-ticket-btn .icon {
  font-size: 26px;
}

.floating-ticket-btn .badge {
  position: absolute;
  top: -2px;
  right: -2px;
  background: var(--danger);
  color: white;
  font-size: 12px;
  font-weight: 800;
  min-width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2px;
  border: 2px solid var(--bg-main);
}

/* Ticket Drawer Deslizable (Mejora Requerida 1) */
.drawer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(4, 7, 13, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.drawer-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.ticket-panel {
  position: fixed;
  top: 0;
  right: -420px;
  width: 100%;
  max-width: 400px;
  height: 100vh;
  z-index: 1001;
  border-radius: 0;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 0;
  transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.ticket-panel.active {
  right: 0;
}

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

.drawer-header h2 {
  margin: 0;
  font-size: 18px;
}

.drawer-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow-y: auto;
}

.close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 28px;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}

.close-btn:hover {
  color: var(--danger);
}

/* Carrito / Ticket Interno */
.cart-items {
  flex: 1;
  overflow-y: auto;
  margin: 16px 0;
}

.empty-cart-state {
  text-align: center;
  color: var(--text-muted);
  padding: 40px 0;
  font-size: 15px;
}

.cart-row {
  background: var(--bg-card);
  padding: 12px;
  border-radius: 12px;
  margin-bottom: 10px;
  border: 1px solid var(--border);
}

.cart-row-info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
}

.cart-row-info strong {
  font-size: 14px;
}

.cart-row-info span {
  font-size: 12px;
  color: var(--text-muted);
}

.cart-row-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.qty-controls {
  display: flex;
  background: var(--bg-main);
  border-radius: 10px; /* Un poco más curvo para hacer juego con los inputs */
  padding: 4px;        /* Más espacio interno para alejar los botones del borde */
  align-items: center;
}

.qty-controls button {
  border: none;
  background: var(--bg-card);
  color: white;
  border-radius: 8px;
  width: 60px;         /* Más anchos (de 28px a 60px) para un mejor contacto con el pulgar */
  height: 44px;        /* Altura ergonómica estándar para pantallas táctiles */
  font-weight: bold;
  font-size: 20px;     /* El símbolo se ve un poco más grande y claro */
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  
  /* Evita comportamientos extraños del navegador en móviles al tocarlos rápido */
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.qty-controls button:active {
  transform: scale(0.95);
  background: var(--border);
}

.qty-controls button:hover {
  background: var(--border);
}

.qty-number {
  padding: 0 12px;
  font-size: 16px;
  font-weight: 700;
  min-width: 36px;     /* Evita que los botones se muevan si cambia la cantidad */
  text-align: center;
}

.subtotal {
  font-weight: 700;
  color: var(--accent);
  font-size: 14px;
}

.ticket-total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  font-size: 16px;
}

.ticket-total strong {
  font-size: 24px;
  color: var(--success);
}

/* Formularios y Campos */
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.field span {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.field input, .field select {
  width: 100%; 
  padding: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: white;
  font-size: 14px;
  transition: border-color 0.2s;
}

.field input:focus {
  outline: none;
  border-color: var(--accent);
}

.file-input-wrapper {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  overflow: hidden; 
}

.field input[type="file"] {
  background: transparent;
  border: none;
  padding: 4px;
  border-radius: 0;
  cursor: pointer;
}

.form-grid {
  display: grid;
  gap: 4px;
}

/* Botones de Acción */
.action-btn {
  background: var(--success);
  color: #090d16;
  border: none;
  padding: 14px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
  font-size: 15px;
  transition: background 0.2s;
  width: 100%;
}

.action-btn:hover {
  background: var(--success-hover);
}

.secondary-btn {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 14px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
  font-size: 15px;
  transition: all 0.2s;
}

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

/* Tablas de Inventario */
.table-wrap {
  overflow-x: auto;
}

.inventory-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.inventory-table th {
  background: var(--bg-card);
  padding: 14px;
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 2px solid var(--border);
}

.inventory-table td {
  padding: 14px;
  border-bottom: 1px solid var(--border);
}

.stock-tag {
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
  padding: 4px 8px;
  border-radius: 6px;
  font-weight: 600;
  white-space: nowrap; 
}

.stock-tag.low-stock {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
}

.inventory-actions {
  display: flex;
  gap: 6px;
}

.edit-btn, .delete-btn {
  border: none;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
  transition: background 0.2s;
}

.edit-btn {
  background: var(--accent);
  color: #090d16;
}

.edit-btn:hover {
  background: var(--accent-hover);
}

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

.delete-btn:hover {
  background: var(--danger-hover);
}

/* Modal Ventana Emergente de Edición (Mejora Requerida 2) */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(4, 7, 13, 0.8);
  backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  padding: 16px;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  width: 100%;
  max-width: 500px;
  transform: translateY(-20px);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.modal-header h2 {
  margin: 0;
  font-size: 18px;
}

.modal-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}

/* Reportes e Historial */
.filter-grid {
  margin-bottom: 24px;
}

.export-action {
  align-self: flex-end;
  margin-bottom: 16px;
  background: var(--accent);
  color: #090d16;
}

.export-action:hover {
  background: var(--accent-hover);
}

.transactions-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tx-item {
  background: var(--bg-card);
  padding: 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.tx-header {
  display: flex;
  justify-content: space-between;
  font-size: 15px;
  margin-bottom: 6px;
}

.tx-total {
  font-weight: 700;
  color: var(--success);
}

.tx-details {
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
}

/* Animaciones */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (min-width: 768px) {
  .app-header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
  
  /* NUEVA REGLA AQUÍ */
  .nav-btn {
    flex: initial; /* Cancela el estiramiento en PC para que midan solo lo que ocupa su texto */
  }
  
  .product-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .filter-grid {
    grid-template-columns: repeat(4, 1fr);
    align-items: flex-end;
  }
  
  .product-card img {
    height: 120px;
  }
}

/* Optimización de espacio para la tabla en móviles */
@media (max-width: 767px) {
  .inventory-table th, 
  .inventory-table td {
    padding: 10px 6px; /* Reduce el espacio para dar más aire al texto */
    font-size: 13px;   /* Achica un pixel el texto para mejorar el ajuste */
  }
}