/* La botonera de Proveedores (botonera.js): una ventana chica con forma de tablero de
   control — chapa oscura con tornillos, placa grabada, botones rojos tipo arcade con aro de
   metal, rótulos de cinta y un visor verde que dice qué hace cada botón. Es un "aparato":
   se ve igual en tema claro y oscuro. Prefijo bt-. */
.bt-fondo { position: fixed; inset: 0; z-index: 9990; display: none; align-items: center; justify-content: center;
  padding: 16px; background: rgba(8, 8, 10, .55); backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px); }
.bt-fondo.on { display: flex; animation: bt-entra .16s ease-out; }
@keyframes bt-entra { from { opacity: 0; } to { opacity: 1; } }

.bt-panel { position: relative; width: min(720px, 100%); max-height: calc(100vh - 32px); overflow-y: auto;
  padding: 22px 24px 20px; border-radius: 22px; color: #ece8e1;
  background:
    repeating-linear-gradient(90deg, rgba(255,255,255,.018) 0 2px, rgba(0,0,0,.02) 2px 4px),
    linear-gradient(165deg, #3d4046 0%, #2a2c31 45%, #1d1e22 100%);
  border: 1px solid #0d0d0f;
  box-shadow: 0 30px 90px rgba(0,0,0,.6), inset 0 1px 0 rgba(255,255,255,.14), inset 0 -3px 0 rgba(0,0,0,.45);
  animation: bt-sube .2s cubic-bezier(.2,.9,.3,1.2); }
@keyframes bt-sube { from { transform: translateY(14px) scale(.98); opacity: .4; } to { transform: none; opacity: 1; } }

/* Los tornillos de las esquinas. */
.bt-tornillo { position: absolute; width: 13px; height: 13px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #c9cdd2, #6c7077 60%, #3a3d42);
  box-shadow: inset 0 -1px 1px rgba(0,0,0,.5), 0 1px 1px rgba(255,255,255,.08); }
.bt-tornillo::after { content: ''; position: absolute; left: 2px; right: 2px; top: 5.5px; height: 2px; background: #2b2d31; transform: rotate(-35deg); border-radius: 1px; }
.bt-tornillo.a { top: 10px; left: 10px; } .bt-tornillo.b { top: 10px; right: 10px; }
.bt-tornillo.c { bottom: 10px; left: 10px; } .bt-tornillo.d { bottom: 10px; right: 10px; }

.bt-cab { display: flex; align-items: center; gap: 12px; margin: 0 8px 16px; }
/* La placa grabada (aluminio). */
.bt-placa { flex: 1; padding: 9px 16px; border-radius: 7px; font-weight: 900; font-size: 15px; letter-spacing: .2em;
  text-transform: uppercase; color: #2c2822; text-shadow: 0 1px 0 rgba(255,255,255,.55);
  background: linear-gradient(180deg, #e4e0d6 0%, #c8c2b4 55%, #b3ad9e 100%);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.7), inset 0 -1px 0 rgba(0,0,0,.25), 0 2px 4px rgba(0,0,0,.5); }
.bt-placa small { font-size: 10.5px; letter-spacing: .28em; color: #5d564b; margin-left: 8px; font-weight: 800; }
.bt-x { width: 38px; height: 38px; border-radius: 50%; border: 0; cursor: pointer; font-size: 15px; color: #e6e1d8;
  background: radial-gradient(circle at 35% 30%, #4a4d53, #1e1f23); box-shadow: 0 3px 0 #0b0b0c, inset 0 1px 0 rgba(255,255,255,.15); }
.bt-x:active { transform: translateY(2px); box-shadow: 0 1px 0 #0b0b0c; }

/* La bandeja hundida donde van los botones. */
.bt-grilla { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px 12px; padding: 22px 14px 18px;
  border-radius: 16px; background: linear-gradient(180deg, #17181b, #1f2125);
  box-shadow: inset 0 3px 10px rgba(0,0,0,.75), inset 0 -1px 0 rgba(255,255,255,.05), 0 1px 0 rgba(255,255,255,.06); }
.bt-celda { display: flex; flex-direction: column; align-items: center; gap: 9px; position: relative; }
.bt-led { width: 8px; height: 8px; border-radius: 50%; background: #2d3a2f; box-shadow: inset 0 1px 1px rgba(0,0,0,.6); }
.bt-led.on { background: #5dff7a; box-shadow: 0 0 6px #5dff7a, 0 0 12px rgba(93,255,122,.55); }

/* El aro de metal y el botón rojo. */
.bt-aro { width: 112px; height: 112px; border-radius: 50%; display: grid; place-items: center;
  background: linear-gradient(145deg, #6a6e75 0%, #3b3e43 45%, #23252a 100%);
  box-shadow: inset 0 2px 2px rgba(255,255,255,.22), inset 0 -4px 7px rgba(0,0,0,.65), 0 3px 6px rgba(0,0,0,.6); }
.bt-boton { position: relative; width: 86px; height: 86px; border-radius: 50%; border: 0; padding: 0; cursor: pointer;
  display: grid; place-items: center; font: inherit;
  background: radial-gradient(circle at 36% 30%, #ff9a8f 0%, #f2463a 26%, #cf1d22 58%, #8c0a10 100%);
  box-shadow: 0 7px 0 #5a0508, 0 11px 16px rgba(0,0,0,.6), inset 0 -7px 12px rgba(0,0,0,.32), inset 0 4px 7px rgba(255,255,255,.3);
  transform: translateY(-3px); transition: transform .07s, box-shadow .07s, filter .15s; }
.bt-boton::after { content: ''; position: absolute; top: 9%; left: 21%; width: 58%; height: 30%; border-radius: 50%;
  background: linear-gradient(180deg, rgba(255,255,255,.62), rgba(255,255,255,0)); pointer-events: none; }
.bt-boton .bt-ico { position: relative; z-index: 1; font-size: 33px; line-height: 1; filter: drop-shadow(0 2px 1px rgba(0,0,0,.45)); }
.bt-boton:hover { filter: brightness(1.1) saturate(1.05); }
.bt-boton:focus-visible { outline: 3px solid #ffd54a; outline-offset: 5px; }
.bt-boton:active, .bt-boton.apretado { transform: translateY(4px);
  box-shadow: 0 1px 0 #5a0508, 0 3px 6px rgba(0,0,0,.6), inset 0 -4px 10px rgba(0,0,0,.4), inset 0 5px 9px rgba(0,0,0,.25); filter: brightness(.95); }
/* Un lugar libre: botón apagado, gris. */
.bt-boton.apagado { cursor: default; background: radial-gradient(circle at 36% 30%, #6d7077 0%, #46494f 45%, #26282c 100%);
  box-shadow: 0 5px 0 #141517, 0 8px 12px rgba(0,0,0,.55), inset 0 -6px 10px rgba(0,0,0,.35), inset 0 3px 6px rgba(255,255,255,.12); }
.bt-boton.apagado::after { opacity: .35; }

/* El rótulo de cinta debajo de cada botón. */
.bt-rotulo { max-width: 100%; padding: 4px 9px; border-radius: 3px; text-align: center; line-height: 1.25;
  font: 800 11px/1.25 ui-monospace, 'Cascadia Mono', Consolas, monospace; letter-spacing: .07em; text-transform: uppercase;
  color: #f4f1ea; background: #0d0e10; text-shadow: 0 1px 0 rgba(0,0,0,.8);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08), 0 1px 0 rgba(255,255,255,.05); }
.bt-celda.libre .bt-rotulo { color: #6f737a; }

/* El visor: dice qué hace el botón que se señala. */
.bt-display { margin-top: 16px; padding: 10px 14px; min-height: 42px; border-radius: 9px;
  font: 600 12.5px/1.45 ui-monospace, 'Cascadia Mono', Consolas, monospace; color: #8dff9e;
  text-shadow: 0 0 6px rgba(93,255,122,.45);
  background: repeating-linear-gradient(180deg, rgba(0,0,0,0) 0 2px, rgba(0,0,0,.18) 2px 3px), #0c1a0f;
  box-shadow: inset 0 2px 8px rgba(0,0,0,.8), 0 1px 0 rgba(255,255,255,.06); }
.bt-cursor { animation: bt-titila 1s steps(2) infinite; }
@keyframes bt-titila { 50% { opacity: 0; } }

@media (max-width: 640px) {
  .bt-panel { padding: 18px 14px 16px; }
  .bt-grilla { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 8px; }
  .bt-aro { width: 96px; height: 96px; } .bt-boton { width: 74px; height: 74px; } .bt-boton .bt-ico { font-size: 28px; }
  .bt-placa { font-size: 13px; letter-spacing: .14em; }
  /* En el celular, de los lugares libres sólo un par (para que no quede una tira larga). */
  .bt-celda.libre ~ .bt-celda.libre ~ .bt-celda.libre { display: none; }
}
@media (prefers-reduced-motion: reduce) { .bt-fondo.on, .bt-panel, .bt-cursor { animation: none; } }