:root {
  --bg: #f4f5f7; --panel: #ffffff; --panel-2: #f9fafb; --borde: #e3e6ea; --texto: #16191d; --suave: #5f6b7a;
  --marca: #0f6fff; --marca-2: #0a57cc; --marca-tenue: #e8f0ff;
  --ok: #138a4b; --ok-tenue: #e3f5ec; --aviso: #b36b00; --aviso-tenue: #fff3dc; --error: #c62828; --error-tenue: #fdeaea;
  --gris-tenue: #eef0f3; --sombra: 0 1px 2px rgba(16,24,40,.06), 0 4px 12px rgba(16,24,40,.06);
  --radio: 10px; --mono: 'JetBrains Mono', ui-monospace, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1216; --panel: #171b21; --panel-2: #1c2128; --borde: #2a3038; --texto: #e7eaee; --suave: #97a3b2;
    --marca: #4c8dff; --marca-2: #6aa0ff; --marca-tenue: #1a2840;
    --ok: #3ccf82; --ok-tenue: #133024; --aviso: #f0a63a; --aviso-tenue: #33270f; --error: #ff6b6b; --error-tenue: #3a1818;
    --gris-tenue: #232a32; --sombra: 0 1px 2px rgba(0,0,0,.4);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--texto); font: 14px/1.45 Inter, system-ui, sans-serif; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--marca); }
.mono { font-family: var(--mono); font-size: 12.5px; }
.suave { color: var(--suave); }
.der { text-align: right; }
.cargando-pantalla { display: grid; place-items: center; height: 100vh; color: var(--suave); }

/* Estructura */
.shell { display: grid; grid-template-columns: 228px 1fr; min-height: 100vh; }
.lateral { background: var(--panel); border-right: 1px solid var(--borde); padding: 16px 10px; display: flex; flex-direction: column; gap: 2px; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.marca { font-weight: 700; font-size: 16px; padding: 4px 10px 14px; display: flex; align-items: center; gap: 8px; }
.marca .logo { width: 28px; height: 28px; border-radius: 8px; background: var(--marca); display: grid; place-items: center; color: #fff; font-size: 14px; }
.nav a { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 8px; color: var(--texto); text-decoration: none; }
.nav a:hover { background: var(--gris-tenue); }
.nav a.activo { background: var(--marca-tenue); color: var(--marca); font-weight: 600; }
.nav .sep { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--suave); padding: 14px 10px 4px; }
.lateral .pie { margin-top: auto; padding: 10px; border-top: 1px solid var(--borde); font-size: 12.5px; }
.principal { min-width: 0; display: flex; flex-direction: column; }
.barra { display: flex; align-items: center; gap: 12px; padding: 12px 24px; border-bottom: 1px solid var(--borde); background: var(--panel); position: sticky; top: 0; z-index: 5; }
.barra h1 { font-size: 18px; margin: 0; flex: 1; }
.menu-movil { display: none; }
.contenido { padding: 20px 24px 60px; max-width: 1400px; width: 100%; }
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .lateral { position: fixed; z-index: 30; width: 250px; transform: translateX(-100%); transition: transform .2s; box-shadow: var(--sombra); }
  .lateral.abierto { transform: none; }
  .menu-movil { display: inline-flex; }
  .barra { padding: 10px 16px; }
  .contenido { padding: 16px; }
}

/* Componentes */
.tarjeta { background: var(--panel); border: 1px solid var(--borde); border-radius: var(--radio); box-shadow: var(--sombra); padding: 16px; }
.tarjeta h2 { font-size: 15px; margin: 0 0 12px; }
.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(2, minmax(0,1fr)); } .g3 { grid-template-columns: repeat(3, minmax(0,1fr)); } .g4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
@media (max-width: 860px) { .g2, .g3, .g4 { grid-template-columns: 1fr; } }
@media (min-width: 861px) and (max-width: 1100px) { .g4 { grid-template-columns: repeat(2, minmax(0,1fr)); } }
.kpi .v { font-size: 22px; font-weight: 700; margin-top: 4px; }
.kpi .l { color: var(--suave); font-size: 12.5px; }
.fila { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.fila > .crece { flex: 1; min-width: 160px; }
.espacio { height: 14px; }

.btn { border: 1px solid var(--borde); background: var(--panel); padding: 8px 14px; border-radius: 8px; cursor: pointer; font-weight: 500; display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; }
.btn:hover { background: var(--gris-tenue); }
.btn.primario { background: var(--marca); color: #fff; border-color: var(--marca); }
.btn.primario:hover { background: var(--marca-2); }
.btn.peligro { color: var(--error); border-color: var(--error); }
.btn.ok { background: var(--ok); color: #fff; border-color: var(--ok); }
.btn.chico { padding: 4px 9px; font-size: 12.5px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn.grande { padding: 12px 18px; font-size: 15px; }

label.campo { display: flex; flex-direction: column; gap: 4px; font-size: 12.5px; color: var(--suave); font-weight: 500; }
input, select, textarea { border: 1px solid var(--borde); background: var(--panel); border-radius: 8px; padding: 8px 10px; width: 100%; min-width: 0; }
textarea { min-height: 70px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--marca-tenue); border-color: var(--marca); }
input[type=checkbox] { width: auto; }
.check { display: flex; gap: 8px; align-items: center; font-size: 13.5px; color: var(--texto); }

table.t { width: 100%; border-collapse: collapse; }
.t th { text-align: left; font-size: 12px; font-weight: 600; color: var(--suave); padding: 8px 10px; border-bottom: 1px solid var(--borde); white-space: nowrap; }
.t td { padding: 9px 10px; border-bottom: 1px solid var(--borde); vertical-align: top; }
.t tr.clic { cursor: pointer; } .t tr.clic:hover td { background: var(--panel-2); }
.tabla-scroll { overflow-x: auto; }
.vacio { padding: 28px; text-align: center; color: var(--suave); }

.chip { display: inline-block; padding: 2px 9px; border-radius: 99px; font-size: 12px; font-weight: 600; background: var(--gris-tenue); color: var(--suave); white-space: nowrap; }
.chip.ok { background: var(--ok-tenue); color: var(--ok); } .chip.aviso { background: var(--aviso-tenue); color: var(--aviso); }
.chip.error { background: var(--error-tenue); color: var(--error); } .chip.info { background: var(--marca-tenue); color: var(--marca); }

.aviso-caja { padding: 10px 14px; border-radius: 8px; background: var(--aviso-tenue); color: var(--aviso); font-weight: 500; }
.aviso-caja.error { background: var(--error-tenue); color: var(--error); }
.aviso-caja.ok { background: var(--ok-tenue); color: var(--ok); }
.aviso-caja.info { background: var(--marca-tenue); color: var(--marca); }

/* Punto de venta */
.pos { display: grid; grid-template-columns: minmax(0,1fr) 380px; gap: 16px; align-items: start; }
@media (max-width: 1100px) { .pos { grid-template-columns: 1fr; } }
.resultados { max-height: 340px; overflow-y: auto; border: 1px solid var(--borde); border-radius: 8px; margin-top: 8px; }
.resultado { padding: 9px 12px; border-bottom: 1px solid var(--borde); cursor: pointer; display: flex; justify-content: space-between; gap: 10px; }
.resultado:hover { background: var(--panel-2); }
.resultado:last-child { border-bottom: 0; }
.total-grande { font-size: 28px; font-weight: 700; }
.lineas-totales div { display: flex; justify-content: space-between; padding: 3px 0; }

/* Modal */
.modal-fondo { position: fixed; inset: 0; background: rgba(10,14,20,.45); display: grid; place-items: center; z-index: 50; padding: 16px; }
.modal { background: var(--panel); border-radius: 12px; width: min(720px, 100%); max-height: 92vh; overflow-y: auto; box-shadow: 0 20px 50px rgba(0,0,0,.25); }
.modal.ancho { width: min(1000px, 100%); }
.modal .cab { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--borde); position: sticky; top: 0; background: var(--panel); z-index: 1; }
.modal .cab h3 { margin: 0; font-size: 16px; }
.modal .cuerpo { padding: 18px; }
.modal .acciones { display: flex; justify-content: flex-end; gap: 8px; padding: 12px 18px; border-top: 1px solid var(--borde); position: sticky; bottom: 0; background: var(--panel); flex-wrap: wrap; }
.x { background: none; border: 0; font-size: 20px; cursor: pointer; color: var(--suave); }

#toasts { position: fixed; bottom: 16px; right: 16px; display: flex; flex-direction: column; gap: 8px; z-index: 100; max-width: min(420px, calc(100vw - 32px)); }
.toast { padding: 12px 14px; border-radius: 8px; background: var(--texto); color: var(--panel); box-shadow: var(--sombra); font-weight: 500; }
.toast.error { background: var(--error); color: #fff; } .toast.ok { background: var(--ok); color: #fff; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--borde); margin-bottom: 14px; overflow-x: auto; }
.tabs button { background: none; border: 0; padding: 9px 12px; cursor: pointer; border-bottom: 2px solid transparent; color: var(--suave); font-weight: 500; white-space: nowrap; }
.tabs button.activo { color: var(--marca); border-bottom-color: var(--marca); }

.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login .tarjeta { width: min(400px, 100%); padding: 28px; }

dl.datos { display: grid; grid-template-columns: 150px 1fr; gap: 6px 12px; margin: 0; }
dl.datos dt { color: var(--suave); font-size: 12.5px; } dl.datos dd { margin: 0; }
.historial { border-left: 2px solid var(--borde); padding-left: 12px; }
.historial div { padding: 4px 0; font-size: 13px; }

/* Impresión (recibo 80 mm y orden) */
#impresion { display: none; }
@media print {
  body > *:not(#impresion) { display: none !important; }
  #impresion { display: block; color: #000; background: #fff; }
  @page { margin: 4mm; }
}
.recibo { width: 72mm; font: 11px/1.35 Arial, sans-serif; color: #000; }
.recibo.carta { width: 100%; max-width: 190mm; font-size: 12px; }
.recibo h1 { font-size: 14px; margin: 0; text-align: center; }
.recibo .c { text-align: center; }
.recibo hr { border: 0; border-top: 1px dashed #000; margin: 6px 0; }
.recibo table { width: 100%; border-collapse: collapse; }
.recibo td { padding: 1px 0; vertical-align: top; }
.recibo .r { text-align: right; }
.recibo .b { font-weight: 700; }
.recibo .qr { display: flex; justify-content: center; margin: 6px 0; }
.recibo .firma { margin-top: 30px; border-top: 1px solid #000; width: 60%; text-align: center; padding-top: 3px; }