:root {
  --fondo: #f4f5f7;
  --superficie: #ffffff;
  --texto: #15181d;
  --suave: #5f6670;
  --marca: #111418;
  --acento: #f2b705;
  --exito: #1f7a3f;
  --error: #b42318;
  --borde: #dde1e6;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fondo: #0d0f12;
    --superficie: #171a1f;
    --texto: #eef0f3;
    --suave: #a0a7b1;
    --borde: #2a2f37;
    --exito: #4cc27a;
    --error: #ff6b5e;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: var(--fondo);
  color: var(--texto);
}
.barra {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; background: var(--marca); color: #fff; font-weight: 600;
}
.barra .logo { height: 28px; width: auto; }
main { max-width: 520px; margin: 0 auto; padding: 20px 16px 48px; }
h1 { font-size: 1.5rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.1rem; margin: 24px 0 8px; }
a { color: inherit; }

form { display: grid; gap: 14px; }
label { display: grid; gap: 4px; font-weight: 500; font-size: .95rem; }
input {
  font: inherit; padding: 12px; border-radius: 10px; width: 100%;
  border: 1px solid var(--borde); background: var(--superficie); color: var(--texto);
}
input:focus { outline: 2px solid var(--acento); outline-offset: 1px; }
.check { grid-template-columns: auto 1fr; align-items: start; gap: 10px; font-weight: 400; font-size: .85rem; color: var(--suave); }
.check input { width: 20px; height: 20px; margin-top: 2px; }

.boton {
  display: inline-flex; justify-content: center; align-items: center; gap: 8px;
  font: inherit; font-weight: 600; padding: 13px 18px; border-radius: 12px; border: 0;
  background: var(--acento); color: #111; text-decoration: none; cursor: pointer; min-height: 48px;
}
.boton:disabled { opacity: .5; }
.boton.secundario { background: transparent; color: var(--texto); border: 1px solid var(--borde); }
.boton.grande { font-size: 1.1rem; min-height: 56px; }
.billeteras { display: grid; gap: 10px; margin: 20px 0; }
.billetera { background: #000; color: #fff; }
.billetera.google { background: #1f1f1f; }

.tarjeta {
  background: var(--marca); color: #fff; border-radius: 18px; padding: 18px;
  text-align: center; box-shadow: 0 8px 24px rgb(0 0 0 / .18);
}
.tarjeta-cabeza { display: flex; justify-content: space-between; align-items: center; font-weight: 600; text-align: left; }
.saldo { display: grid; text-align: right; font-size: 1.8rem; line-height: 1; color: var(--acento); }
.saldo small { font-size: .65rem; letter-spacing: .08em; color: #cfd3d8; }
.qr { background: #fff; border-radius: 12px; padding: 12px; margin: 16px auto 8px; max-width: 240px; }
.qr svg { display: block; width: 100%; height: auto; }
.serial { font-family: ui-monospace, monospace; letter-spacing: .06em; margin: 0; }
.nota { color: var(--suave); font-size: .85rem; }
.tarjeta .nota { color: #cfd3d8; }

.historial { list-style: none; padding: 0; margin: 0; }
.historial li { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--borde); font-size: .9rem; }
.pos { color: var(--exito); }
.neg { color: var(--error); }

.exito, .error, .destacado { padding: 10px 14px; border-radius: 10px; }
.exito { background: color-mix(in srgb, var(--exito) 14%, transparent); color: var(--exito); }
.error { background: color-mix(in srgb, var(--error) 12%, transparent); color: var(--error); }
.destacado { background: color-mix(in srgb, var(--acento) 18%, transparent); }
.aviso:empty { display: none; }
.aviso { padding: 10px 14px; border-radius: 10px; }

.camara { position: relative; background: #000; border-radius: 14px; overflow: hidden; aspect-ratio: 4 / 3; margin-bottom: 10px; }
.camara video { width: 100%; height: 100%; object-fit: cover; }
.mira { position: absolute; inset: 18%; border: 3px solid var(--acento); border-radius: 14px; pointer-events: none; }
.fila { grid-template-columns: 1fr auto; margin-top: 12px; }
#form-canje.fila { grid-template-columns: 1fr 1fr auto; }
.resultados { list-style: none; padding: 0; display: grid; gap: 6px; }
.resultados button {
  width: 100%; text-align: left; font: inherit; padding: 12px; border-radius: 10px;
  border: 1px solid var(--borde); background: var(--superficie); color: var(--texto); cursor: pointer;
}
.ficha { background: var(--superficie); border: 1px solid var(--borde); border-radius: 16px; padding: 16px; margin-top: 16px; }
.ficha h2 { margin-top: 0; font-size: 1.3rem; }
.saldo-grande { font-size: 1.25rem; font-weight: 600; }
.bloque { margin-top: 14px; }
.pie { text-align: center; margin-top: 32px; font-size: .9rem; color: var(--suave); }

.afiche { text-align: center; }
.afiche h1 { font-size: 2rem; }
.afiche .grande { font-size: 1.3rem; font-weight: 600; }
.afiche .qr { max-width: 340px; }
@media print {
  .barra, .no-imprimir { display: none; }
  body { background: #fff; color: #000; }
}
@media (max-width: 420px) {
  #form-canje.fila { grid-template-columns: 1fr; }
}