:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --texto: #1f2430;
  --texto-suave: #5b6472;
  --borde: #e2e5ea;
  --primario: #2563eb;
  --primario-osc: #1d4ed8;
  --exito: #15803d;
  --peligro: #dc2626;
  --alerta-bg: #fef3c7;
  --alerta-borde: #f59e0b;
  --radio: 10px;
  --sombra: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c;
    --panel: #1d2127;
    --texto: #e8eaed;
    --texto-suave: #9aa3b2;
    --borde: #2c313a;
    --primario: #3b82f6;
    --primario-osc: #2563eb;
    --exito: #4ade80;
    --peligro: #f87171;
    --alerta-bg: #3a2f12;
    --alerta-borde: #b45309;
    --sombra: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--texto);
  font-size: 15px;
  line-height: 1.5;
}

/* ---------------------------------------------------------------- header */
#barra {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--borde);
  position: sticky;
  top: 0;
  z-index: 20;
  flex-wrap: wrap;
}

.marca {
  font-weight: 700;
  font-size: 17px;
  display: flex;
  align-items: center;
  gap: 9px;
  letter-spacing: -0.01em;
}

.marca-ico {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--primario);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
}

.marca-ico svg {
  width: 18px;
  height: 18px;
  display: block;
}

#menu {
  display: flex;
  gap: 2px;
  flex: 1;
  flex-wrap: wrap;
}

#menu a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 11px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--texto-suave);
  font-weight: 500;
}

#menu a .ico {
  opacity: 0.75;
}

#menu a:hover {
  background: var(--bg);
  color: var(--texto);
}

#menu a.activo {
  background: color-mix(in srgb, var(--primario) 14%, transparent);
  color: var(--primario);
}

#menu a.activo .ico {
  opacity: 1;
}

/* ------------------------------------------------------------ iconos ---- */
.ico {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  line-height: 0;
}

.ico svg {
  display: block;
}

.titulo-ico {
  display: flex;
  align-items: center;
  gap: 9px;
}

.titulo-ico .ico {
  color: var(--texto-suave);
}

h2.titulo-ico .ico {
  color: var(--primario);
}

.usuario {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--texto-suave);
}

/* ---------------------------------------------------------------- layout */
#vista {
  max-width: 1080px;
  margin: 0 auto;
  padding: 22px 18px 60px;
}

h1 {
  font-size: 22px;
  margin: 0 0 4px;
}

h2 {
  font-size: 17px;
  margin: 28px 0 12px;
}

.subtitulo {
  color: var(--texto-suave);
  margin: 0 0 20px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  padding: 18px;
  box-shadow: var(--sombra);
  margin-bottom: 18px;
}

/* ---------------------------------------------------------------- forms */
label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--texto-suave);
  margin-bottom: 4px;
}

input,
select,
button,
textarea {
  font: inherit;
}

input,
select,
textarea {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--borde);
  border-radius: 8px;
  background: var(--bg);
  color: var(--texto);
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--primario);
  outline-offset: 1px;
}

.campos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.campo {
  margin-bottom: 12px;
}

button {
  cursor: pointer;
  border: 0;
  border-radius: 8px;
  padding: 9px 16px;
  font-weight: 600;
  background: var(--primario);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
}

button .ico {
  margin-left: -2px;
}

.mini .ico {
  opacity: 0.85;
}

button:hover {
  background: var(--primario-osc);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

button.secundario {
  background: var(--bg);
  color: var(--texto);
  border: 1px solid var(--borde);
}

button.peligro {
  background: var(--peligro);
}

button.btn-plano {
  background: none;
  color: var(--texto-suave);
  padding: 6px 10px;
}

button.btn-plano:hover {
  background: var(--bg);
  color: var(--texto);
}

.mini {
  padding: 5px 10px;
  font-size: 13px;
}

.acciones {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ---------------------------------------------------------------- tablas */
.tabla-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--borde);
  white-space: nowrap;
}

th {
  color: var(--texto-suave);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tbody tr:hover {
  background: var(--bg);
}

tr.fila-click {
  cursor: pointer;
}

tr.fila-click:hover {
  background: color-mix(in srgb, var(--primario) 8%, transparent);
}

td.num,
th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

tr.bajo-stock td {
  background: var(--alerta-bg);
}

.etiqueta {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  background: var(--bg);
  border: 1px solid var(--borde);
}

.etiqueta.rojo {
  color: var(--peligro);
  border-color: var(--peligro);
}

.etiqueta.verde {
  color: var(--exito);
  border-color: var(--exito);
}

/* ---------------------------------------------------------------- login */
.login-caja {
  max-width: 360px;
  margin: 8vh auto 0;
}

.login-marca {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}

.login-marca .ico {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--primario);
  color: #fff;
}

.login-caja .subtitulo {
  text-align: center;
}

/* ---------------------------------------------------------------- panel de tarjetas */
.tarjetas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 22px;
}

.tarjeta {
  background: var(--panel);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  padding: 16px;
  box-shadow: var(--sombra);
}

.tarjeta .valor {
  font-size: 26px;
  font-weight: 700;
  margin-top: 4px;
}

.tarjeta .rotulo {
  font-size: 13px;
  color: var(--texto-suave);
}

.tarjeta.alerta {
  border-color: var(--alerta-borde);
  background: var(--alerta-bg);
}

/* ---------------------------------------------------------------- filtros */
.filtros {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-bottom: 16px;
}

.filtros .campo {
  margin: 0;
  min-width: 150px;
}

.filtros input,
.filtros select {
  width: auto;
  min-width: 150px;
}

/* ---------------------------------------------------------------- mensajes */
.mensaje {
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-size: 14px;
}

.mensaje.error {
  background: color-mix(in srgb, var(--peligro) 14%, transparent);
  color: var(--peligro);
  border: 1px solid var(--peligro);
}

.mensaje.ok {
  background: color-mix(in srgb, var(--exito) 14%, transparent);
  color: var(--exito);
  border: 1px solid var(--exito);
}

.vacio {
  text-align: center;
  color: var(--texto-suave);
  padding: 30px;
}

/* ---------------------------------------------------------------- modal */
.modal-fondo {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 6vh 16px;
  z-index: 50;
}

.modal {
  background: var(--panel);
  border-radius: var(--radio);
  padding: 22px;
  width: 100%;
  max-width: 460px;
  max-height: 86vh;
  overflow-y: auto;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.modal h2 {
  margin-top: 0;
}

/* ------------------------------------------------------------ venta ok -- */
.venta-ok {
  border-color: var(--exito);
  background: color-mix(in srgb, var(--exito) 10%, transparent);
}

.venta-ok .titulo-ico .ico {
  color: var(--exito);
}

/* ---------------------------------------------------------------- carrito */
.carrito-total {
  font-size: 22px;
  font-weight: 700;
  text-align: right;
  margin: 12px 0;
}

/* ---------------------------------------------------------------- toast */
#toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(calc(100% + 40px));
  background: var(--texto);
  color: var(--bg);
  padding: 11px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: transform 0.25s ease, opacity 0.2s ease, visibility 0.25s;
  z-index: 80;
  max-width: 90vw;
}

#toast.ver {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  visibility: visible;
}

#toast.error {
  background: var(--peligro);
  color: #fff;
}

@media (max-width: 620px) {
  #barra {
    gap: 10px;
  }
  #menu {
    order: 3;
    width: 100%;
  }
}