/* =====================================================================
   LIBRERÍA · ESTILOS
   Paleta: azul claro, blanco y tonos pastel
   ===================================================================== */

:root {
  --azul: #4a90d9;
  --azul-oscuro: #2f6fb5;
  --azul-claro: #e8f2fc;
  --azul-borde: #cfe1f5;
  --fondo: #f4f8fc;
  --superficie: #ffffff;
  --texto: #1f2d3d;
  --texto-suave: #687a8f;
  --borde: #e0e8f1;

  --menta: #dff5ea;    --menta-texto: #1f7a50;
  --durazno: #ffecd9;  --durazno-texto: #a85a12;
  --rosa: #fde4e6;     --rosa-texto: #b4323f;
  --lila: #ece7fb;     --lila-texto: #5b47a8;
  --amarillo: #fff6d6; --amarillo-texto: #8a6a00;

  --radio: 12px;
  --radio-sm: 8px;
  --sombra: 0 1px 2px rgba(31, 45, 61, .05), 0 4px 16px rgba(31, 45, 61, .06);
  --sombra-alta: 0 12px 40px rgba(31, 45, 61, .18);
  --transicion: .18s ease;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: 'Nunito', system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 15px;
  color: var(--texto);
  background: var(--fondo);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { margin: 0; font-weight: 800; }
h3 { font-size: 1.05rem; }
a { color: var(--azul-oscuro); text-decoration: none; font-weight: 700; }
a:hover { text-decoration: underline; }
[hidden] { display: none !important; }
.texto-suave { color: var(--texto-suave); }
.derecha { text-align: right; }
.centro { text-align: center; }
.nowrap { white-space: nowrap; }
.mono { font-variant-numeric: tabular-nums; }
.positivo { color: var(--menta-texto); font-weight: 800; }
.negativo { color: var(--rosa-texto); font-weight: 800; }
svg.ic { width: 18px; height: 18px; flex: none; }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 9px 16px; border-radius: var(--radio-sm); border: 1px solid transparent;
  font: inherit; font-weight: 700; cursor: pointer; white-space: nowrap;
  transition: background var(--transicion), transform var(--transicion), box-shadow var(--transicion), border-color var(--transicion);
}
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primario { background: var(--azul); color: #fff; box-shadow: 0 2px 8px rgba(74, 144, 217, .3); }
.btn-primario:hover:not(:disabled) { background: var(--azul-oscuro); }
.btn-secundario { background: var(--azul-claro); color: var(--azul-oscuro); border-color: var(--azul-borde); }
.btn-secundario:hover:not(:disabled) { background: #dbeafa; }
.btn-peligro { background: var(--rosa); color: var(--rosa-texto); border-color: #f6c9ce; }
.btn-peligro:hover:not(:disabled) { background: #fbd3d7; }
.btn-exito { background: #2e9d6a; color: #fff; box-shadow: 0 2px 8px rgba(46, 157, 106, .3); }
.btn-exito:hover:not(:disabled) { background: #26845a; }
.btn-fantasma { background: transparent; color: var(--texto-suave); justify-content: flex-start; }
.btn-fantasma:hover { background: var(--azul-claro); color: var(--azul-oscuro); }
.btn-sm { padding: 6px 10px; font-size: .86rem; }
.btn-grande { padding: 14px 20px; font-size: 1.08rem; }
.btn-bloque { width: 100%; }
.btn-icono {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: var(--radio-sm); border: 1px solid var(--borde);
  background: var(--superficie); color: var(--texto-suave); cursor: pointer; transition: var(--transicion);
}
.btn-icono:hover:not(:disabled) { background: var(--azul-claro); color: var(--azul-oscuro); border-color: var(--azul-borde); }
.btn-icono.peligro:hover:not(:disabled) { background: var(--rosa); color: var(--rosa-texto); border-color: #f6c9ce; }
.btn-icono:disabled { opacity: .45; cursor: not-allowed; }
.btn-link { background: none; border: 0; color: var(--azul-oscuro); font: inherit; font-weight: 700; cursor: pointer; padding: 6px; }
.btn-link:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid rgba(74, 144, 217, .45); outline-offset: 2px; }

/* ---------- Formularios ---------- */
.campo { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.campo label, .etiqueta { font-weight: 700; font-size: .88rem; color: var(--texto); }
.campo small { color: var(--texto-suave); font-size: .8rem; }
.campo .error-campo { color: var(--rosa-texto); font-weight: 700; }
input, select, textarea {
  font: inherit; color: var(--texto); background: var(--superficie);
  border: 1px solid var(--borde); border-radius: var(--radio-sm); padding: 9px 12px; width: 100%;
  transition: border-color var(--transicion), box-shadow var(--transicion);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--azul); box-shadow: 0 0 0 3px rgba(74, 144, 217, .18); }
input.invalido, select.invalido { border-color: #e5848f; box-shadow: 0 0 0 3px rgba(229, 132, 143, .15); }
input[type="checkbox"] { width: 18px; height: 18px; accent-color: var(--azul); }
textarea { resize: vertical; min-height: 70px; }
.grid-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 16px; }
.grid-form .ancho-completo { grid-column: 1 / -1; }
.check { display: flex; align-items: center; gap: 10px; font-weight: 600; cursor: pointer; margin-bottom: 14px; }

.buscador { position: relative; display: flex; align-items: center; }
.buscador > svg { position: absolute; left: 12px; color: var(--texto-suave); pointer-events: none; }
.buscador input { padding-left: 40px; }
.buscador.grande input { padding: 14px 14px 14px 44px; font-size: 1.05rem; border-radius: var(--radio); }
.buscador.grande > svg { left: 15px; width: 20px; height: 20px; }

.filtros { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; margin-bottom: 16px; }
.filtros > * { flex: 1 1 160px; }
.filtros .buscador { flex: 2 1 240px; }
.filtros .campo { margin: 0; }
.filtros .campo label { font-size: .78rem; color: var(--texto-suave); }
.filtros .btn { flex: 0 0 auto; }

/* ---------- Pantalla de carga y login ---------- */
.pantalla-carga { position: fixed; inset: 0; display: grid; place-items: center; background: var(--fondo); }
.login {
  min-height: 100vh; display: grid; place-items: center; padding: 16px;
  background: radial-gradient(circle at 15% 20%, #dcebfb 0, transparent 40%),
              radial-gradient(circle at 85% 80%, var(--lila) 0, transparent 40%), var(--fondo);
}
.login-caja {
  width: 100%; max-width: 380px; background: var(--superficie); border-radius: 18px;
  padding: 32px 28px; box-shadow: var(--sombra-alta); text-align: center;
}
.login-caja form { text-align: left; margin-top: 22px; }
.login-caja h1 { font-size: 1.5rem; margin-top: 12px; }
.login-logo {
  width: 64px; height: 64px; margin: 0 auto; border-radius: 18px; display: grid; place-items: center;
  background: var(--azul-claro); color: var(--azul);
}
.login-logo svg { width: 32px; height: 32px; }

/* ---------- Estructura de la aplicación ---------- */
.app { display: grid; grid-template-columns: 250px minmax(0, 1fr); min-height: 100vh; }
.lateral {
  position: sticky; top: 0; height: 100vh; display: flex; flex-direction: column;
  background: var(--superficie); border-right: 1px solid var(--borde); padding: 18px 14px;
}
.marca { display: flex; align-items: center; gap: 12px; padding: 4px 8px 18px; }
.marca strong { display: block; font-size: 1.05rem; }
.marca small { color: var(--texto-suave); }
.marca-icono {
  width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center;
  background: var(--azul-claro); color: var(--azul);
}
.menu { display: flex; flex-direction: column; gap: 2px; overflow-y: auto; flex: 1; }
.menu a {
  display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 10px;
  color: var(--texto-suave); font-weight: 700; transition: var(--transicion);
}
.menu a:hover { background: var(--azul-claro); color: var(--azul-oscuro); text-decoration: none; }
.menu a.activo { background: var(--azul); color: #fff; box-shadow: 0 2px 10px rgba(74, 144, 217, .35); }
.menu .menu-seccion { font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--texto-suave); padding: 14px 12px 6px; font-weight: 800; }
.lateral-pie { border-top: 1px solid var(--borde); padding-top: 12px; display: flex; flex-direction: column; gap: 4px; }
.usuario-chip { display: flex; align-items: center; gap: 10px; padding: 6px 8px 10px; }
.usuario-chip strong { display: block; font-size: .92rem; }
.usuario-chip small { color: var(--texto-suave); text-transform: capitalize; }
.avatar {
  width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; flex: none;
  background: var(--lila); color: var(--lila-texto); font-weight: 800;
}
.principal { display: flex; flex-direction: column; min-width: 0; }
.barra {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 12px;
  padding: 14px 28px; background: rgba(244, 248, 252, .88); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--borde);
}
.barra h2 { font-size: 1.3rem; flex: 1; }
.barra-acciones { display: flex; gap: 8px; flex-wrap: wrap; }
.vista { padding: 24px 28px 40px; outline: none; animation: aparecer .25s ease; }
.solo-movil { display: none; }
.velo { display: none; }

@keyframes aparecer { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- Tarjetas ---------- */
.card { background: var(--superficie); border: 1px solid var(--borde); border-radius: var(--radio); box-shadow: var(--sombra); padding: 20px; }
.card + .card, .grid-2 + .card, .card + .grid-2, .kpis + .grid-2, .kpis + .card { margin-top: 20px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }

.kpis { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 16px; }
.kpi { background: var(--superficie); border: 1px solid var(--borde); border-radius: var(--radio); padding: 16px 18px; box-shadow: var(--sombra); }
.kpi .kpi-etiqueta { color: var(--texto-suave); font-weight: 700; font-size: .85rem; display: flex; align-items: center; gap: 8px; }
.kpi .kpi-valor { font-size: 1.6rem; font-weight: 800; margin-top: 6px; font-variant-numeric: tabular-nums; }
.kpi .kpi-extra { color: var(--texto-suave); font-size: .82rem; margin-top: 2px; }
.kpi.azul { background: linear-gradient(135deg, #eaf3fd, #fff); }
.kpi.menta { background: linear-gradient(135deg, var(--menta), #fff); }
.kpi.durazno { background: linear-gradient(135deg, var(--durazno), #fff); }
.kpi.rosa { background: linear-gradient(135deg, var(--rosa), #fff); }
.kpi.lila { background: linear-gradient(135deg, var(--lila), #fff); }
a.kpi { color: inherit; display: block; transition: transform var(--transicion), box-shadow var(--transicion); }
a.kpi:hover { text-decoration: none; transform: translateY(-2px); box-shadow: var(--sombra-alta); }

.grafico { position: relative; height: 280px; }

/* ---------- Tablas ---------- */
.tabla-contenedor { overflow-x: auto; border: 1px solid var(--borde); border-radius: var(--radio); background: var(--superficie); }
table.tabla { width: 100%; border-collapse: collapse; font-size: .92rem; }
.tabla th {
  text-align: left; font-size: .76rem; text-transform: uppercase; letter-spacing: .05em;
  color: var(--texto-suave); background: #f8fbfe; padding: 11px 14px; border-bottom: 1px solid var(--borde); white-space: nowrap;
}
.tabla td { padding: 11px 14px; border-bottom: 1px solid var(--borde); vertical-align: middle; }
.tabla tr:last-child td { border-bottom: 0; }
.tabla tbody tr { transition: background var(--transicion); }
.tabla tbody tr:hover { background: #f8fbfe; }
.tabla tr.inactivo td { color: var(--texto-suave); }
.tabla .acciones { display: flex; gap: 6px; justify-content: flex-end; }
.tabla td small { display: block; color: var(--texto-suave); font-size: .8rem; }
.tabla tfoot td { font-weight: 800; background: #f8fbfe; }
.paginacion { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 12px; color: var(--texto-suave); font-size: .9rem; flex-wrap: wrap; }
.paginacion div { display: flex; gap: 6px; }

/* ---------- Etiquetas ---------- */
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 999px; font-size: .78rem; font-weight: 800; white-space: nowrap; }
.b-ok { background: var(--menta); color: var(--menta-texto); }
.b-bajo { background: var(--durazno); color: var(--durazno-texto); }
.b-agotado { background: var(--rosa); color: var(--rosa-texto); }
.b-info { background: var(--azul-claro); color: var(--azul-oscuro); }
.b-lila { background: var(--lila); color: var(--lila-texto); }
.b-gris { background: #eef1f5; color: var(--texto-suave); }
.b-amarillo { background: var(--amarillo); color: var(--amarillo-texto); }

.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--borde); background: var(--superficie); color: var(--texto-suave);
  padding: 6px 12px; border-radius: 999px; font: inherit; font-size: .85rem; font-weight: 700; cursor: pointer; transition: var(--transicion);
}
.chip:hover { border-color: var(--azul-borde); color: var(--azul-oscuro); }
.chip.activo { background: var(--azul-claro); border-color: var(--azul); color: var(--azul-oscuro); }

.pestanas { display: flex; gap: 4px; border-bottom: 1px solid var(--borde); margin-bottom: 18px; overflow-x: auto; }
.pestana {
  background: none; border: 0; border-bottom: 3px solid transparent; padding: 10px 16px; font: inherit;
  font-weight: 700; color: var(--texto-suave); cursor: pointer; white-space: nowrap;
}
.pestana.activo { color: var(--azul-oscuro); border-bottom-color: var(--azul); }

/* ---------- Avisos, vacíos y carga ---------- */
.aviso { padding: 12px 14px; border-radius: var(--radio-sm); font-weight: 600; margin: 14px 0; text-align: left; display: flex; gap: 10px; align-items: flex-start; }
.aviso-error { background: var(--rosa); color: var(--rosa-texto); }
.aviso-info { background: var(--azul-claro); color: var(--azul-oscuro); }
.aviso-alerta { background: var(--durazno); color: var(--durazno-texto); }
.aviso-ok { background: var(--menta); color: var(--menta-texto); }

.vacio { text-align: center; padding: 40px 16px; color: var(--texto-suave); }
.vacio .vacio-icono { width: 56px; height: 56px; border-radius: 50%; margin: 0 auto 12px; display: grid; place-items: center; background: var(--azul-claro); color: var(--azul); }
.vacio .vacio-icono svg { width: 26px; height: 26px; }
.vacio strong { display: block; color: var(--texto); margin-bottom: 4px; }

.cargando { display: flex; align-items: center; justify-content: center; gap: 12px; padding: 40px 16px; color: var(--texto-suave); font-weight: 700; }
.spinner { width: 22px; height: 22px; border-radius: 50%; border: 3px solid var(--azul-claro); border-top-color: var(--azul); animation: girar .8s linear infinite; flex: none; }
.spinner.grande { width: 40px; height: 40px; border-width: 4px; }
.spinner.mini { width: 16px; height: 16px; border-width: 2px; border-color: rgba(255,255,255,.4); border-top-color: #fff; }
@keyframes girar { to { transform: rotate(360deg); } }
.esqueleto { background: linear-gradient(90deg, #eef3f8 25%, #f7fafd 50%, #eef3f8 75%); background-size: 200% 100%; animation: brillo 1.2s infinite; border-radius: var(--radio); min-height: 96px; }
@keyframes brillo { to { background-position: -200% 0; } }

/* ---------- Toasts ---------- */
.toasts { position: fixed; right: 20px; bottom: 20px; z-index: 1000; display: flex; flex-direction: column; gap: 10px; max-width: min(380px, calc(100vw - 32px)); }
.toast {
  display: flex; gap: 10px; align-items: flex-start; padding: 12px 16px; border-radius: var(--radio);
  background: var(--superficie); box-shadow: var(--sombra-alta); border-left: 5px solid var(--azul);
  font-weight: 600; animation: entrarToast .25s ease;
}
.toast.ok { border-left-color: #2e9d6a; }
.toast.ok svg { color: #2e9d6a; }
.toast.error { border-left-color: #d9505f; }
.toast.error svg { color: #d9505f; }
.toast.aviso { border-left-color: #e3943c; }
.toast.aviso svg { color: #e3943c; }
.toast.saliendo { opacity: 0; transform: translateX(20px); transition: .25s; }
@keyframes entrarToast { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: none; } }

/* ---------- Modales ---------- */
.modal-fondo {
  position: fixed; inset: 0; z-index: 500; background: rgba(31, 45, 61, .4); backdrop-filter: blur(2px);
  display: grid; place-items: center; padding: 16px; animation: fundido .2s ease;
}
.modal {
  width: 100%; max-width: 520px; max-height: calc(100vh - 32px); display: flex; flex-direction: column;
  background: var(--superficie); border-radius: 16px; box-shadow: var(--sombra-alta); animation: subir .22s ease;
}
.modal.ancho { max-width: 860px; }
.modal.medio { max-width: 680px; }
.modal-cabecera { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 18px 22px; border-bottom: 1px solid var(--borde); }
.modal-cabecera h3 { font-size: 1.15rem; }
.modal-cuerpo { padding: 20px 22px; overflow-y: auto; }
.modal-pie { display: flex; justify-content: flex-end; gap: 10px; padding: 14px 22px; border-top: 1px solid var(--borde); flex-wrap: wrap; }
@keyframes fundido { from { opacity: 0; } }
@keyframes subir { from { opacity: 0; transform: translateY(12px) scale(.98); } }

/* ---------- Desplegable del buscador de productos ---------- */
.desplegable {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0; z-index: 60; max-height: 340px; overflow-y: auto;
  background: var(--superficie); border: 1px solid var(--borde); border-radius: var(--radio); box-shadow: var(--sombra-alta);
}
.desplegable button {
  display: flex; width: 100%; align-items: center; justify-content: space-between; gap: 12px; text-align: left;
  padding: 10px 14px; border: 0; background: none; font: inherit; cursor: pointer; border-bottom: 1px solid var(--borde);
}
.desplegable button:last-child { border-bottom: 0; }
.desplegable button:hover, .desplegable button.marcado { background: var(--azul-claro); }
.desplegable small { display: block; color: var(--texto-suave); }
.desplegable .sin-resultados { padding: 14px; color: var(--texto-suave); text-align: center; }

/* ---------- Punto de venta ---------- */
.pos { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(330px, 1fr); gap: 20px; align-items: start; }
.pos-buscar .chips { margin: 14px 0; }
.lista-productos { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; max-height: calc(100vh - 290px); overflow-y: auto; padding: 2px; }
.prod-tarjeta {
  display: flex; flex-direction: column; gap: 6px; text-align: left; padding: 14px; border-radius: var(--radio);
  border: 1px solid var(--borde); background: var(--superficie); font: inherit; cursor: pointer; transition: var(--transicion);
}
.prod-tarjeta:hover:not(:disabled) { border-color: var(--azul); box-shadow: 0 4px 14px rgba(74, 144, 217, .18); transform: translateY(-1px); }
.prod-tarjeta:disabled { cursor: not-allowed; opacity: .6; }
.prod-tarjeta .prod-nombre { font-weight: 800; line-height: 1.25; }
.prod-tarjeta .prod-meta { font-size: .8rem; color: var(--texto-suave); }
.prod-tarjeta .prod-pie { display: flex; justify-content: space-between; align-items: center; margin-top: auto; padding-top: 6px; }
.prod-tarjeta .prod-precio { font-weight: 800; color: var(--azul-oscuro); font-size: 1.05rem; }

.pos-ticket { position: sticky; top: 84px; }
.items-venta { display: flex; flex-direction: column; max-height: calc(100vh - 560px); min-height: 120px; overflow-y: auto; margin: 0 -6px; }
.item-venta { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 10px; align-items: center; padding: 10px 6px; border-bottom: 1px dashed var(--borde); }
.item-venta .item-nombre { font-weight: 700; line-height: 1.2; }
.item-venta small { color: var(--texto-suave); }
.item-venta .item-total { font-weight: 800; min-width: 74px; text-align: right; }
.cantidad { display: inline-flex; align-items: center; border: 1px solid var(--borde); border-radius: var(--radio-sm); overflow: hidden; }
.cantidad button { width: 30px; height: 32px; border: 0; background: var(--azul-claro); color: var(--azul-oscuro); cursor: pointer; display: grid; place-items: center; }
.cantidad button:hover { background: #d6e7fa; }
.cantidad input { width: 48px; border: 0; border-radius: 0; text-align: center; padding: 6px 2px; }
.cantidad input:focus { box-shadow: none; }
.totales { margin: 14px 0; display: flex; flex-direction: column; gap: 8px; }
.totales .fila { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.totales .fila input { max-width: 120px; text-align: right; padding: 6px 10px; }
.totales .total { font-size: 1.45rem; font-weight: 800; border-top: 2px solid var(--borde); padding-top: 10px; }
.metodos { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; margin-bottom: 12px; }
.metodos .chip { padding: 8px 4px; border-radius: var(--radio-sm); }
.rapidos { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.vuelto { background: var(--menta); color: var(--menta-texto); border-radius: var(--radio-sm); padding: 10px 12px; display: flex; justify-content: space-between; font-weight: 800; margin: 10px 0; }
.vuelto.falta { background: var(--rosa); color: var(--rosa-texto); }
details.extra { margin-bottom: 14px; }
details.extra summary { cursor: pointer; font-weight: 700; color: var(--azul-oscuro); padding: 4px 0; }
.atajos { color: var(--texto-suave); font-size: .8rem; text-align: center; margin-top: 10px; }
kbd { background: #eef3f8; border: 1px solid var(--borde); border-bottom-width: 2px; border-radius: 4px; padding: 0 5px; font-family: inherit; font-size: .78rem; }

/* ---------- Ticket ---------- */
.ticket { font-family: 'Courier New', monospace; font-size: 13px; max-width: 320px; margin: 0 auto; background: #fff; padding: 12px; border: 1px dashed var(--borde); }
.ticket h4 { text-align: center; font-family: inherit; font-size: 15px; }
.ticket .t-centro { text-align: center; }
.ticket table { width: 100%; border-collapse: collapse; margin: 8px 0; }
.ticket td { padding: 2px 0; vertical-align: top; }
.ticket .t-linea { border-top: 1px dashed #999; margin: 6px 0; }
.ticket .t-total td { font-weight: bold; font-size: 15px; }

/* ---------- Interruptor ---------- */
.switch { position: relative; display: inline-block; width: 44px; height: 24px; flex: none; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch span { position: absolute; inset: 0; background: #d5dde6; border-radius: 999px; cursor: pointer; transition: var(--transicion); }
.switch span::before { content: ''; position: absolute; width: 18px; height: 18px; left: 3px; top: 3px; background: #fff; border-radius: 50%; transition: var(--transicion); box-shadow: 0 1px 3px rgba(0,0,0,.2); }
.switch input:checked + span { background: #2e9d6a; }
.switch input:checked + span::before { transform: translateX(20px); }
.switch input:disabled + span { opacity: .5; cursor: not-allowed; }

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .pos { grid-template-columns: 1fr; }
  .pos-ticket { position: static; }
  .items-venta { max-height: none; }
  .lista-productos { max-height: 420px; }
}
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .lateral { position: fixed; z-index: 100; left: 0; top: 0; width: 270px; transform: translateX(-100%); transition: transform .25s ease; box-shadow: var(--sombra-alta); }
  .app.menu-abierto .lateral { transform: none; }
  .app.menu-abierto .velo { display: block; position: fixed; inset: 0; z-index: 90; background: rgba(31, 45, 61, .35); }
  .solo-movil { display: inline-flex; }
  .grid-2 { grid-template-columns: 1fr; }
  .barra { padding: 12px 16px; }
  .vista { padding: 16px 16px 32px; }
}
@media (max-width: 600px) {
  .grid-form { grid-template-columns: 1fr; }
  .barra h2 { font-size: 1.1rem; }
  .barra-acciones .btn span { display: none; }
  .kpi .kpi-valor { font-size: 1.3rem; }
  .metodos { grid-template-columns: repeat(3, 1fr); }
  .modal-cuerpo, .modal-cabecera, .modal-pie { padding-left: 16px; padding-right: 16px; }
}