:root {
  --fondo: #f6f3ee;
  --papel: #ffffff;
  --tinta: #1b1d2a;
  --suave: #6b6e7d;
  --linea: #e4dfd6;
  --marca: #d8342b;
  --marca-osc: #a9241d;
  --oro: #f2b632;
  --verde: #1f9d55;
  --verde-claro: #e3f5ea;
  --ambar: #f5a524;
  --ambar-claro: #fff3dc;
  --gris-claro: #eceae5;
  --radio: 14px;
  --sombra: 0 1px 2px rgba(27, 29, 42, .06), 0 6px 20px rgba(27, 29, 42, .06);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--fondo); color: var(--tinta);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--marca); }
h1, h2, h3 { line-height: 1.15; margin: 0 0 .4em; }
h2 { font-size: 1.4rem; }
.envase { max-width: 980px; margin: 0 auto; padding: 0 16px; }
.seccion { padding-top: 28px; padding-bottom: 28px; }
.tarjeta { background: var(--papel); border-radius: var(--radio); box-shadow: var(--sombra); padding: 20px; }
.suave { color: var(--suave); }
.chico { font-size: .875rem; }
.oculto { display: none !important; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 0; border-radius: 999px; padding: 12px 22px; font: inherit; font-weight: 700;
  background: var(--marca); color: #fff; cursor: pointer; text-decoration: none;
  transition: background .15s, transform .05s;
}
.btn:hover { background: var(--marca-osc); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.sec { background: var(--gris-claro); color: var(--tinta); }
.btn.sec:hover { background: var(--linea); }
.btn.chico { padding: 7px 14px; font-size: .875rem; }
.btn.ancho { width: 100%; }
.btn.verde { background: var(--verde); }

label { display: block; font-weight: 600; font-size: .9rem; margin: 12px 0 4px; }
input, select, textarea {
  width: 100%; font: inherit; padding: 11px 12px; border: 1px solid var(--linea);
  border-radius: 10px; background: #fff; color: var(--tinta);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--oro); border-color: var(--oro); }
textarea { min-height: 120px; resize: vertical; }

.error { background: #fde8e6; color: var(--marca-osc); padding: 10px 12px; border-radius: 10px; margin-top: 12px; font-size: .9rem; }
.aviso { background: var(--ambar-claro); padding: 10px 14px; border-radius: 10px; font-size: .9rem; }

/* ---------- Billete en 4 partes ---------- */
.billete {
  display: grid; grid-template-columns: 96px 1fr; background: var(--papel);
  border-radius: var(--radio); box-shadow: var(--sombra); overflow: hidden; margin-bottom: 14px;
}
.billete .talon {
  background: var(--tinta); color: #fff; display: flex; flex-direction: column;
  align-items: center; justify-content: center; padding: 12px 6px; position: relative;
}
.billete .talon::after {
  content: ""; position: absolute; right: -1px; top: 8px; bottom: 8px;
  border-right: 2px dashed var(--fondo);
}
.billete .talon small { font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; opacity: .7; }
.billete .talon b { font-size: 2.1rem; font-variant-numeric: tabular-nums; letter-spacing: .04em; }
.billete .talon.completo { background: var(--verde); }
.billete .cuerpo { padding: 12px; }
.billete .partes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.parte {
  border: 2px dashed var(--linea); border-radius: 10px; padding: 8px 4px; text-align: center;
  min-height: 74px; display: flex; flex-direction: column; justify-content: center; font-size: .75rem; color: var(--suave);
}
.parte .n { font-weight: 800; font-size: 1rem; color: var(--suave); }
.parte.paga { border: 2px solid var(--verde); background: var(--verde-claro); color: var(--verde); }
.parte.paga .n { color: var(--verde); }
.parte.nueva { animation: aparecer .6s ease-out; }
@keyframes aparecer { from { transform: scale(.6); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.parte .cod { font-family: ui-monospace, Menlo, monospace; font-size: .7rem; letter-spacing: .04em; }
.billete .pie { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.sello { font-weight: 800; color: var(--verde); }
@media (max-width: 420px) {
  .billete { grid-template-columns: 74px 1fr; }
  .billete .talon b { font-size: 1.6rem; }
  .parte { min-height: 64px; }
  .parte .cod { font-size: .62rem; }
}

/* ---------- Modal ---------- */
.modal { position: fixed; inset: 0; background: rgba(27, 29, 42, .55); display: flex; align-items: flex-end; justify-content: center; z-index: 50; }
.modal .caja { background: var(--papel); width: 100%; max-width: 480px; max-height: 92vh; overflow: auto; border-radius: 18px 18px 0 0; padding: 22px 18px; }
@media (min-width: 600px) { .modal { align-items: center; } .modal .caja { border-radius: 18px; } }