/* ===== avisa-contable — UI de campo =====
   Herramienta para tenderos rurales: alto contraste (pantallas al sol),
   toque grande, mínimo texto. Paleta andina: verde pino + ámbar uchuva. */
:root{
  --pino:#14563d;      /* estructura / marca */
  --pino-2:#0e4030;
  --ambar:#e39a1c;     /* acción principal (vender/cobrar) */
  --ambar-2:#c9840f;
  --arcilla:#b4472e;   /* fiado / alerta, con moderación */
  --crema:#f7f3ea;     /* superficie */
  --papel:#fffdf8;     /* tarjetas */
  --tinta:#1c1a15;     /* texto */
  --tinta-2:#5c584c;
  --linea:#e2dccb;
  --ok:#2f7d4f;
  --radio:16px;
  --sombra:0 2px 0 rgba(28,26,21,.06), 0 8px 24px rgba(28,26,21,.08);
  font-size:17px;
}
*{box-sizing:border-box}
html,body{margin:0}
body{
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background:var(--crema); color:var(--tinta);
  -webkit-tap-highlight-color:transparent;
  padding-bottom:88px;
}
@media (prefers-reduced-motion:no-preference){
  .screen{animation:fade .18s ease}
  @keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
}

/* Encabezado: la caja del día como una registradora */
.topbar{
  background:var(--pino); color:#fdf7e6; padding:14px 18px 18px;
  border-bottom:4px solid var(--ambar);
}
.topbar .unidad{font-size:.82rem;letter-spacing:.04em;opacity:.85;text-transform:uppercase}
.caja-dia{display:flex;gap:10px;margin-top:10px;flex-wrap:wrap}
.kpi{background:rgba(255,255,255,.10);border-radius:12px;padding:10px 14px;flex:1;min-width:96px}
.kpi .n{font-size:1.5rem;font-weight:800;line-height:1.1}
.kpi .l{font-size:.72rem;opacity:.85;text-transform:uppercase;letter-spacing:.03em}
.kpi.saldo .n{color:#ffe9a8}

/* Contenido */
main{max-width:640px;margin:0 auto;padding:16px}
h2{font-size:1.15rem;margin:4px 0 12px}
.muted{color:var(--tinta-2)}

/* Botonera principal — tiles grandes */
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.tile{
  border:none;border-radius:var(--radio);padding:22px 16px;min-height:104px;
  background:var(--papel);box-shadow:var(--sombra);text-align:left;cursor:pointer;
  display:flex;flex-direction:column;justify-content:space-between;color:var(--tinta);
}
.tile:active{transform:translateY(1px)}
.tile .ico{font-size:1.9rem;line-height:1}
.tile .txt{font-size:1.1rem;font-weight:700}
.tile.vender{background:var(--ambar);color:#241a00}
.tile.vender .txt{font-weight:800}
.tile.fiado{outline:2px solid transparent}
.badge{align-self:flex-start;background:var(--arcilla);color:#fff;border-radius:999px;
  font-size:.72rem;padding:2px 9px;font-weight:700;margin-top:6px}

/* Tarjetas y listas */
.card{background:var(--papel);border-radius:var(--radio);box-shadow:var(--sombra);
  padding:14px;margin-bottom:12px}
.row{display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:12px 4px;border-bottom:1px solid var(--linea)}
.row:last-child{border-bottom:none}
.row .nombre{font-weight:600}
.row .sub{font-size:.82rem;color:var(--tinta-2)}
.price{font-weight:800;white-space:nowrap}
.pill{font-size:.72rem;padding:2px 8px;border-radius:999px;background:#eee;color:#333}
.pill.low{background:#f6dfd7;color:var(--arcilla);font-weight:700}

/* Botones */
.btn{border:none;border-radius:12px;padding:16px;font-size:1.05rem;font-weight:700;
  cursor:pointer;width:100%;min-height:56px}
.btn.primary{background:var(--ambar);color:#241a00}
.btn.primary:active{background:var(--ambar-2)}
.btn.dark{background:var(--pino);color:#fdf7e6}
.btn.ghost{background:transparent;color:var(--pino);border:2px solid var(--pino)}
.btn.small{width:auto;min-height:44px;padding:10px 16px;font-size:.95rem}
.btn:disabled{opacity:.45}

/* Formularios */
label{display:block;font-weight:600;margin:12px 0 6px}
input,select{width:100%;padding:14px;font-size:1.05rem;border:2px solid var(--linea);
  border-radius:12px;background:#fff;color:var(--tinta)}
input:focus,select:focus{outline:none;border-color:var(--pino)}
.seg{display:flex;gap:8px;margin-top:6px}
.seg button{flex:1;padding:14px;border-radius:12px;border:2px solid var(--linea);
  background:#fff;font-weight:700;cursor:pointer}
.seg button.on{border-color:var(--pino);background:var(--pino);color:#fdf7e6}

/* Carrito de venta */
.cart{margin-top:8px}
.cart .row .qty{display:flex;align-items:center;gap:8px}
.qty button{width:40px;height:40px;border-radius:10px;border:2px solid var(--linea);
  background:#fff;font-size:1.2rem;font-weight:800;cursor:pointer}
.total-bar{position:sticky;bottom:0;background:var(--papel);border-top:2px solid var(--linea);
  padding:12px;display:flex;gap:12px;align-items:center;margin:0 -16px -16px}
.total-bar .t{flex:1}
.total-bar .t .n{font-size:1.4rem;font-weight:800}

/* Navegación inferior */
.tabbar{position:fixed;bottom:0;left:0;right:0;background:var(--papel);
  border-top:1px solid var(--linea);display:flex;max-width:640px;margin:0 auto}
.tabbar button{flex:1;border:none;background:none;padding:10px 4px 12px;cursor:pointer;
  color:var(--tinta-2);font-size:.72rem;display:flex;flex-direction:column;align-items:center;gap:3px}
.tabbar button .ic{font-size:1.3rem}
.tabbar button.on{color:var(--pino);font-weight:700}

/* Comprobante / toast */
.toast{position:fixed;left:50%;bottom:96px;transform:translateX(-50%);
  background:var(--pino);color:#fff;padding:14px 20px;border-radius:12px;
  box-shadow:var(--sombra);font-weight:700;z-index:50;max-width:90%}
.recibo{text-align:center;padding:22px 8px}
.recibo .num{font-size:1.6rem;font-weight:800;color:var(--pino);letter-spacing:.02em}
.recibo .check{font-size:2.6rem}
.arqueo .big{font-size:2rem;font-weight:800}
.arqueo .cuadra{color:var(--ok)} .arqueo .falta{color:var(--arcilla)}
.hidden{display:none}
.empty{text-align:center;color:var(--tinta-2);padding:28px 12px}