:root {
  --primary: #10b981;
  --primary-dark: #059669;
  --bg: #f4f6f5;
  --card-bg: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --danger: #ef4444;
  --warning: #f59e0b;
  --sidebar-bg: #14532d;
  --sidebar-bg-2: #0f3d21;
  --sidebar-text: #ecfdf5;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
}
* { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; }
body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}
a { color: inherit; }
a:not(.btn):not(.nav-item):not(.cat-btn):not(.tab-link) { color: var(--primary-dark); }
input, select, textarea, button { font-family: inherit; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 1px; }
button, .btn, .nav-item, .cat-btn, .tab-link, .btn-icon { transition: background-color .15s ease, color .15s ease, box-shadow .15s ease, transform .1s ease; }

/* ---- Login ---- */
.login-body { display: flex; align-items: center; justify-content: center; height: 100vh; background: linear-gradient(135deg, var(--sidebar-bg), var(--primary-dark)); }
.login-box { background: var(--card-bg); padding: 2.5rem; border-radius: 12px; width: 320px; box-shadow: 0 10px 30px rgba(0,0,0,.2); text-align: center; }
.login-box h1 { margin: 0; }
.login-sub { color: var(--muted); margin-top: -.5rem; margin-bottom: 1.5rem; }
.login-box form { display: flex; flex-direction: column; gap: .9rem; text-align: left; }
.login-box label { font-size: .85rem; color: var(--muted); display: flex; flex-direction: column; gap: .3rem; }
.login-box input { padding: .55rem .7rem; border: 1px solid var(--border); border-radius: 6px; font-size: 1rem; }

/* ---- Shell ---- */
.app-shell { display: flex; min-height: 100vh; }
.sidebar { width: 260px; background: linear-gradient(180deg, var(--sidebar-bg), var(--sidebar-bg-2)); color: var(--sidebar-text); padding: 1rem; flex-shrink: 0; overflow-y: auto; }
.sidebar-brand { font-size: 1.3rem; font-weight: 700; margin-bottom: 1rem; letter-spacing: .01em; }
.fecha-picker { display: flex; flex-direction: column; gap: .3rem; margin-bottom: 1rem; font-size: .8rem; }
.fecha-picker input { padding: .4rem; border-radius: 6px; border: none; }
.nav-list { display: flex; flex-direction: column; gap: .2rem; margin-bottom: 1rem; }
.nav-item { padding: .55rem .7rem; border-radius: 8px; text-decoration: none; color: var(--sidebar-text); font-size: .92rem; display: flex; gap: .5rem; align-items: center; }
.nav-item:hover { background: rgba(255,255,255,.08); }
.nav-item.active { background: var(--primary); color: #fff; font-weight: 600; }
.nav-item.logout { margin-top: 1rem; opacity: .8; }
.sidebar-widget { background: rgba(255,255,255,.06); border-radius: 8px; padding: .6rem .7rem; margin-bottom: .6rem; font-size: .85rem; }
.sidebar-widget h4 { margin: 0 0 .4rem; font-size: .82rem; text-transform: uppercase; letter-spacing: .04em; opacity: .8; }
.sidebar-widget summary { cursor: pointer; font-weight: 600; }
.sidebar-widget form { display: flex; flex-direction: column; gap: .4rem; margin-top: .5rem; }
.sidebar-widget input, .sidebar-widget select { padding: .35rem .5rem; border-radius: 6px; border: none; font-size: .82rem; }
.checkbox-label, .radio-label { display: flex; align-items: center; gap: .3rem; }
.metric { display: flex; justify-content: space-between; padding: .15rem 0; }
.concepto-row { display: flex; justify-content: space-between; align-items: center; padding: .2rem 0; }
.concepto-row em { opacity: .7; font-size: .75rem; }

.content { flex: 1; padding: 1.5rem 2rem; max-width: 1200px; }

/* ---- Cards / forms ---- */
.card { background: var(--card-bg); border-radius: var(--radius); padding: 1.2rem 1.4rem; margin-bottom: 1.2rem; box-shadow: var(--shadow); }
.card h2 { margin-top: 0; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: .8rem; align-items: end; }
.form-grid label { display: flex; flex-direction: column; gap: .3rem; font-size: .85rem; color: var(--muted); }
.form-grid input, .form-grid select, .form-grid textarea { padding: .5rem .6rem; border: 1px solid var(--border); border-radius: 6px; font-size: .95rem; }
.form-grid input:focus, .form-grid select:focus, .form-grid textarea:focus { border-color: var(--primary); }
.variantes-box { border: 1px dashed var(--border); border-radius: 8px; padding: .7rem .8rem; }
.variante-row { display: flex; gap: .5rem; align-items: center; margin-bottom: .4rem; }
.variante-row input { flex: 1; padding: .4rem .5rem; border: 1px solid var(--border); border-radius: 6px; font-size: .85rem; }
.pos-card-variante { width: 100%; padding: .3rem; font-size: .75rem; border: 1px solid var(--border); border-radius: 6px; }
.btn { padding: .55rem 1.1rem; border-radius: 6px; border: none; background: var(--primary); color: #fff; font-weight: 600; cursor: pointer; font-size: .9rem; }
.btn:hover { background: var(--primary-dark); }
.btn:active { transform: scale(.98); }
.btn:disabled { background: #cbd5e1; cursor: not-allowed; }
.btn-sm { padding: .4rem .7rem; font-size: .8rem; }
.btn-secondary { background: #6b7280; }
.btn-secondary:hover { background: #4b5563; }
.btn-icon { background: none; border: none; cursor: pointer; font-size: 1rem; padding: .2rem .3rem; border-radius: 4px; }
.btn-icon:hover { background: rgba(0,0,0,.06); }

/* ---- Tables ---- */
.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.data-table th { padding: .5rem .6rem; border-bottom: 2px solid var(--border); text-align: left; color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; }
.data-table td { padding: .55rem .6rem; border-bottom: 1px solid var(--border); text-align: left; }
.data-table tbody tr:hover { background: #f8faf9; }
.data-table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.row-total { font-weight: 700; background: #f0fdf4; }
.row-total:hover { background: #f0fdf4 !important; }
.table-empty { color: var(--muted); font-style: italic; }

/* ---- Metrics row ---- */
.metrics-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; margin-bottom: 1.2rem; }
.metric-card { background: var(--card-bg); border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow); border-left: 3px solid var(--border); }
.metric-card .label { color: var(--muted); font-size: .8rem; }
.metric-card .value { font-size: 1.4rem; font-weight: 700; }
.metric-card.success { border-left-color: var(--primary); }
.metric-card.success .value { color: var(--primary-dark); }
.metric-card.danger { border-left-color: var(--danger); }
.metric-card.danger .value { color: var(--danger); }
.metric-card.warning { border-left-color: var(--warning); }
.metric-card.warning .value { color: var(--warning); }

/* ---- Flash / toasts ---- */
#flash-container { position: fixed; top: 1rem; right: 1rem; z-index: 999; display: flex; flex-direction: column; gap: .5rem; }
.flash { padding: .7rem 1rem; border-radius: 8px; font-size: .9rem; box-shadow: 0 4px 12px rgba(0,0,0,.15); animation: flash-in .2s ease; }
.flash-success { background: #d1fae5; color: #065f46; }
.flash-warning { background: #fef3c7; color: #92400e; }
.flash-error { background: #fee2e2; color: #991b1b; }
.flash-info { background: #dbeafe; color: #1e40af; }
@keyframes flash-in { from { opacity: 0; transform: translateX(12px); } to { opacity: 1; transform: translateX(0); } }

/* ---- Tabs ---- */
.tabs { display: flex; gap: .3rem; margin-bottom: 1rem; border-bottom: 1px solid var(--border); overflow-x: auto; }
.tab-link { padding: .6rem 1rem; text-decoration: none; color: var(--muted); border-bottom: 2px solid transparent; white-space: nowrap; }
.tab-link:hover { color: var(--text); }
.tab-link.active { color: var(--primary-dark); border-bottom-color: var(--primary); font-weight: 600; }

.muted { color: var(--muted); }
.edit-inline-form { display: flex; flex-direction: column; gap: .3rem; min-width: 180px; }
.edit-inline-form input, .edit-inline-form select { padding: .3rem .4rem; border: 1px solid var(--border); border-radius: 4px; font-size: .82rem; }

/* ---- POS ----
   grid-template-areas: el buscador es un elemento independiente (hermano de
   categorías/productos/carrito, no anidado dentro de .pos-productos) para
   poder reordenar solo el buscador y el carrito en móvil sin tocar el layout
   de escritorio (ver @media abajo — Mejora PRES2). */
.pos-layout {
  display: grid;
  grid-template-columns: 160px 1fr 340px;
  grid-template-areas: "cat search cart" "cat grid cart";
  gap: 1rem;
  align-items: start;
}
.pos-categorias { grid-area: cat; display: flex; flex-direction: column; gap: .3rem; }
.cat-btn { display: block; padding: .5rem .6rem; border-radius: 8px; background: var(--card-bg); text-decoration: none; color: var(--text); font-size: .85rem; box-shadow: 0 1px 2px rgba(0,0,0,.05); }
.cat-btn.active { background: var(--primary); color: #fff; font-weight: 600; }
.pos-search { grid-area: search; display: flex; gap: .5rem; margin-bottom: .8rem; flex-wrap: wrap; }
.pos-search input[type="text"] { flex: 1; min-width: 200px; padding: .5rem .7rem; border: 1px solid var(--border); border-radius: 6px; }
.pos-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: .8rem; }
.pos-card { background: var(--card-bg); border-radius: 10px; padding: .7rem; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,.06); display: flex; flex-direction: column; gap: .3rem; }
.pos-card-img { width: 100%; height: 80px; object-fit: cover; border-radius: 6px; }
.pos-card-placeholder { width: 100%; height: 80px; border-radius: 6px; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 1.8rem; font-weight: 700; }
.pos-card-nombre { font-size: .82rem; font-weight: 600; min-height: 2.2em; }
.pos-card-precio { color: var(--primary-dark); font-weight: 700; }
.pos-card-stock { font-size: .72rem; }
.pos-productos { grid-area: grid; }
.pos-carrito { grid-area: cart; background: var(--card-bg); border-radius: 10px; padding: 1rem; box-shadow: 0 1px 3px rgba(0,0,0,.06); position: sticky; top: 1rem; max-height: calc(100vh - 2rem); display: flex; flex-direction: column; }
.pos-carrito select { width: 100%; padding: .5rem; margin-bottom: .8rem; border-radius: 6px; border: 1px solid var(--border); }
/* Lista de productos del carrito con scroll propio: el total y los botones
   Vaciar/Pagar quedan siempre visibles abajo, sin importar cuántos productos
   se agreguen (antes había que hacer scroll de toda la página y los últimos
   productos agregados quedaban fuera de vista). */
.cart-items-scroll { overflow-y: auto; -webkit-overflow-scrolling: touch; flex: 1 1 auto; min-height: 0; padding-right: .3rem; }

/* Línea del carrito: nombre+borrar arriba, campos ETIQUETADOS (Unidad/Precio/
   Cant. o Monto) en medio, subtotal abajo — para que nunca se confunda cuál
   cuadro es el precio y cuál la cantidad. */
.cart-line { padding: .6rem 0; border-bottom: 1px solid var(--border); font-size: .82rem; }
.cart-line-top { display: flex; justify-content: space-between; align-items: flex-start; gap: .4rem; margin-bottom: .4rem; }
.cart-line-name { font-weight: 600; flex: 1; }
.cart-line-fields { display: flex; gap: .6rem; flex-wrap: wrap; align-items: flex-end; margin-bottom: .35rem; }
.cart-field { display: flex; flex-direction: column; gap: .2rem; }
.cart-field label { font-size: .66rem; color: var(--muted); font-weight: 700; text-transform: uppercase; letter-spacing: .03em; }
.cart-field select, .cart-field input { padding: .32rem .4rem; border: 1px solid var(--border); border-radius: 5px; font-size: .85rem; }
.cart-field-unidad select { width: 5.4rem; }
.cart-field-variante { flex-basis: 100%; }
.cart-field-variante select { width: 100%; max-width: 14rem; }
.cart-field-precio input, .cart-field-monto input { width: 4.8rem; }
.cart-field-cant input { width: 4rem; }
.cart-line-bottom { display: flex; justify-content: space-between; align-items: center; }
.cart-line-subtotal { text-align: right; font-weight: 700; color: var(--primary-dark); font-size: .95rem; }
.cart-total { text-align: right; font-weight: 700; font-size: 1.1rem; margin: .8rem 0; }
.cart-actions { display: flex; gap: .5rem; }
.cart-actions form { flex: 1; }
.cart-actions button { width: 100%; }

/* ---- Modal genérico (alta rápida de producto desde el POS) ---- */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(15,23,42,.55); z-index: 1000; align-items: center; justify-content: center; padding: 1rem; }
.modal-overlay.open { display: flex; }
.modal-box { background: var(--card-bg); border-radius: var(--radius); padding: 1.4rem; width: 100%; max-width: 420px; max-height: 90vh; overflow-y: auto; box-shadow: 0 10px 30px rgba(0,0,0,.25); position: relative; }
.modal-box h3 { margin-top: 0; }
.modal-close { position: absolute; top: .8rem; right: .9rem; background: none; border: none; font-size: 1.2rem; cursor: pointer; color: var(--muted); }
.ticket-box { background: #fff; border: 1px dashed var(--border); border-radius: 8px; padding: 1rem; font-family: 'Courier New', monospace; font-size: .85rem; }
@media print { .sidebar, .card:not(.ticket-box) { display: none !important; } }

/* ---- Buscador de imágenes con IA (Mejora IA #1) ---- */
.ia-buscador { margin: .5rem 0; padding: .6rem; border: 1px dashed var(--border); border-radius: 8px; background: #f8fafc; }
.ia-buscador .ia-msg { font-size: .78rem; margin: .35rem 0; min-height: 1em; }
.ia-img-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .45rem; margin-top: .4rem; }
.ia-img-item { border: 2px solid var(--border); border-radius: 8px; padding: .25rem; cursor: pointer; background: #fff; text-align: center; transition: border-color .15s; }
.ia-img-item:hover { border-color: #94a3b8; }
.ia-img-item.sel { border-color: #10b981; box-shadow: 0 0 0 2px rgba(16,185,129,.25); }
.ia-img-item img { width: 100%; height: 72px; object-fit: contain; display: block; }
.ia-img-fuente { font-size: .62rem; color: var(--muted); margin-top: .2rem; }
.ia-sel { display: flex; align-items: center; gap: .6rem; margin-top: .5rem; font-size: .78rem; color: #166534; }
.ia-sel img { width: 56px; height: 56px; object-fit: contain; border: 1px solid var(--border); border-radius: 6px; background: #fff; }

/* Revisión del escaneo de factura (Mejora APP6 #2): badges de estado por línea,
   chip del producto asociado y autocompletado por fila. El JS muestra/oculta con
   style.display inline; aquí solo el estado por defecto (por eso :empty y no
   display:none fijo en la lista). */
.ia-badge { display: inline-block; font-size: .68rem; margin-top: .15rem; padding: .05rem .45rem; border-radius: 999px; }
.ia-badge-ok { background: #dcfce7; color: #166534; }
.ia-badge-warn { background: #fef3c7; color: #92400e; }
.ia-badge-info { background: #e0f2fe; color: #075985; }
.ia-chip { display: inline-flex; align-items: center; gap: .35rem; background: #ecfdf5; border: 1px solid #6ee7b7; color: #065f46; border-radius: 999px; padding: .15rem .55rem; font-size: .78rem; max-width: 100%; }
.ia-chip span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ia-chip-x { border: none; background: none; cursor: pointer; color: #047857; font-size: .85rem; line-height: 1; padding: 0; }
.ia-chip-x:hover { color: #b91c1c; }
.ia-asoc-buscar { position: relative; }
.ia-asoc-inp { width: 100%; padding: .35rem .5rem; border: 1px solid var(--border); border-radius: 6px; font-size: .8rem; }
.ia-asoc-list { position: absolute; top: 100%; left: 0; right: 0; z-index: 60; background: #fff; border: 1px solid var(--border); border-radius: 0 0 8px 8px; box-shadow: 0 8px 16px rgba(15,23,42,.12); max-height: 220px; overflow-y: auto; }
.ia-asoc-list:empty { display: none; }
.ia-asoc-item { padding: .35rem .55rem; font-size: .78rem; cursor: pointer; border-bottom: 1px solid #f1f5f9; }
.ia-asoc-item:hover { background: #eff6ff; }
.ia-asoc-item.ia-asoc-vacio { color: var(--muted); cursor: default; }
.ia-asoc-item.ia-asoc-vacio:hover { background: #fff; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .app-shell { flex-direction: column; }
  .sidebar { width: 100%; max-height: 60vh; }
  .content { padding: 1rem; }
  /* Mejora PRES2: en celular el carrito quedaba al final de todos los
     productos (había que scrollear toda la lista para verlo). Ahora el
     orden es categorías → buscador → carrito → productos. */
  .pos-layout { grid-template-columns: 1fr !important; grid-template-areas: "cat" "search" "cart" "grid" !important; }
  .pos-carrito { position: static; }
  .metrics-row { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .metrics-row { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
}