/* =====================================================================
   Kuan Yin · "Calculadora" — estilos (prefijo calc-)
   Teclas como baldosas de hueso con filetes finos, operaciones en piedra
   de lapislázuli sin motas, "=" en oro en lámina.
   ===================================================================== */

.calc {
  box-sizing: border-box;
  height: 100%;
  width: 100%;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto auto minmax(0, 1fr);
  row-gap: 12px;
  padding: 12px 16px 16px;
  color: var(--tinta);
  font: 500 15px/1.4 var(--f-texto);
  letter-spacing: .01em;
  container-type: size;
  -webkit-tap-highlight-color: transparent;
}
.calc *, .calc *::before, .calc *::after { box-sizing: border-box; }
.calc [hidden] { display: none !important; }

/* ---------- Visor ---------- */
.calc-pantalla { position: relative; min-width: 0; padding: 4px 2px 12px; }
.calc-pantalla::after {
  content: '';
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--oro-filete);
}
.calc-expr {
  margin: 0;
  min-height: 21px;
  font: 500 13.5px/21px var(--f-texto);
  letter-spacing: .04em;
  color: var(--tinta-tenue);
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-variant-numeric: tabular-nums;
}
.calc-resultado {
  display: block;
  height: 64px;
  font-family: var(--f-display);
  font-weight: 400;
  font-size: 56px;
  line-height: 64px;
  letter-spacing: -.01em;
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  color: var(--tinta);
  font-variant-numeric: lining-nums tabular-nums;
  -webkit-user-select: text;
  user-select: text;
}
.calc-resultado.calc-error {
  font: 500 18px/64px var(--f-texto);
  letter-spacing: .02em;
  color: var(--rojo);
}

/* ---------- Barra: Cinta · Copiar ---------- */
.calc-barra { display: flex; justify-content: space-between; align-items: center; gap: 8px; min-width: 0; }
.calc-barra .calc-chico { min-width: 0; }
.calc-chico {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--linea-oro);
  border-radius: var(--r);
  background: transparent;
  color: var(--oro);
  font: 600 12px/1.2 var(--f-texto);
  letter-spacing: .2em;
  text-transform: uppercase;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.calc-chico svg { width: 16px; height: 16px; stroke-width: 1.4; }
.calc-chico:hover:not(:disabled) { border-color: var(--oro); background: var(--oro-suave); }
.calc-chico:disabled { opacity: .45; cursor: default; }
.calc-chico[aria-expanded="true"],
.calc-chico[aria-expanded="true"]:hover:not(:disabled) { background: var(--oro-foil); border-color: transparent; color: var(--sobre-oro); }
.calc-chico.calc-hecho { border-color: var(--verde); color: var(--verde); }
.calc-cuenta {
  display: inline-grid;
  place-items: center;
  min-width: 22px;
  height: 20px;
  padding: 0 5px;
  margin-left: -2px;
  border-radius: var(--r);
  background: var(--oro-suave);
  color: var(--oro);
  font: 600 12px/1 var(--f-texto);
  letter-spacing: 0;
  font-variant-numeric: tabular-nums;
}
.calc-chico[aria-expanded="true"] .calc-cuenta { background: rgba(0, 0, 0, .12); color: var(--sobre-oro); }
.calc-chico:focus-visible, .calc-tecla:focus-visible, .calc-cinta-item:focus-visible { outline: 1px solid var(--oro); outline-offset: 2px; }

/* ---------- Teclado ---------- */
.calc-cuerpo { position: relative; min-height: 0; min-width: 0; display: grid; grid-template-columns: minmax(0, 1fr); }
.calc-teclado {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-rows: repeat(5, minmax(44px, 1fr));
  gap: 6px;
  min-height: 0;
}
.calc-tecla {
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 44px;
  padding: 0;
  border: 1px solid var(--linea);
  border-radius: var(--r);
  background: var(--superficie);
  color: var(--tinta);
  font: 400 27px/1 var(--f-texto);
  font-variant-numeric: lining-nums;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
  transition: background-color .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease), transform .12s var(--ease), filter .18s var(--ease);
}
.calc-tecla:hover { border-color: var(--linea-oro); }
.calc-tecla:active, .calc-tecla.calc-pulsada { transform: scale(.965); filter: brightness(.94); }
.calc-num:active, .calc-num.calc-pulsada { background: var(--superficie-2); filter: none; }

/* funciones: AC · borrar · % · ± */
.calc-fn {
  background: var(--superficie-2);
  color: var(--oro);
  font: 500 22px/1 var(--f-texto);
}
.calc-fn[data-k="AC"] { font-size: 14px; letter-spacing: .2em; padding-left: .2em; }
.calc-fn svg { width: 24px; height: 24px; stroke-width: 1.3; }

/* operaciones: piedra de lapislázuli */
.calc-op {
  border-color: transparent;
  background-color: var(--lapis-hondo);
  background-image: var(--mar);
  background-size: 100% 100%;
  color: var(--sobre-mar);
  font-size: 31px;
  font-weight: 300;
}
.calc-op:hover { border-color: var(--oro-hondo); }
.calc-op.calc-activa {
  background: var(--superficie);
  color: var(--lapis);
  border-color: var(--lapis);
  box-shadow: inset 0 0 0 1px var(--lapis);
}
:root:not([data-theme="light"]) .calc-op { border-color: var(--linea-oro); }
:root:not([data-theme="light"]) .calc-op.calc-activa { background: var(--tinta); color: var(--bg); border-color: var(--tinta); box-shadow: none; }

/* igual: oro en lámina */
.calc-igual {
  border-color: transparent;
  background: var(--oro-foil);
  color: var(--sobre-oro);
  font-size: 32px;
  font-weight: 300;
}
.calc-igual:hover { border-color: transparent; filter: brightness(1.05); }

/* ---------- Cinta ---------- */
.calc-cinta {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border: 1px solid var(--linea);
  border-radius: var(--r);
  background: var(--superficie);
  animation: calc-aparecer .22s var(--ease);
}
.calc-cinta-cab { display: flex; flex-direction: column; gap: 2px; padding: 12px 14px 10px; border-bottom: 1px solid var(--linea); }
.calc-cinta-titulo { font: 600 12px/1.3 var(--f-texto); letter-spacing: .28em; text-transform: uppercase; color: var(--oro); }
.calc-cinta-ayuda { font: 500 12.5px/1.4 var(--f-texto); color: var(--tinta-tenue); }
.calc-cinta-lista {
  flex: 1 1 auto;
  min-height: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.calc-cinta-item {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1px;
  width: 100%;
  min-height: 44px;
  padding: 9px 14px;
  border: 0;
  border-bottom: 1px solid var(--linea);
  background: transparent;
  color: inherit;
  text-align: right;
  cursor: pointer;
  transition: background-color .15s var(--ease);
}
.calc-cinta-item:hover { background: var(--oro-suave); }
.calc-cinta-expr {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font: 500 13px/1.35 var(--f-texto);
  letter-spacing: .03em;
  color: var(--tinta-suave);
  font-variant-numeric: tabular-nums;
}
.calc-cinta-res {
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font: 400 22px/1.2 var(--f-display);
  color: var(--tinta);
  font-variant-numeric: lining-nums;
}
.calc-cinta-vacia {
  flex: 1 1 auto;
  display: grid;
  place-items: center;
  margin: 0;
  padding: 20px 22px;
  color: var(--tinta-tenue);
  font: 500 14px/1.55 var(--f-texto);
  text-align: center;
  text-wrap: balance;
}
.calc-cinta-vacia b { color: var(--oro); font-weight: 600; }
.calc-cinta-pie { display: flex; justify-content: space-between; gap: 8px; padding: 10px; border-top: 1px solid var(--linea); }
.calc-cinta-pie .calc-chico { flex: 1 1 0; min-width: 0; padding: 0 10px; letter-spacing: .14em; white-space: normal; text-align: center; line-height: 1.25; }
.calc-peligro { color: var(--tinta-suave); border-color: var(--linea-fuerte); }
.calc-peligro:hover:not(:disabled) { color: var(--rojo); border-color: var(--rojo); background: transparent; }
.calc-peligro.calc-confirmar { color: #fff; background: var(--rojo); border-color: var(--rojo); }
@keyframes calc-aparecer { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ---------- Alturas chicas ---------- */
@container (max-height: 520px) {
  .calc-resultado { font-size: 44px; height: 52px; line-height: 52px; }
  .calc-resultado.calc-error { line-height: 52px; }
  .calc-teclado { gap: 5px; }
  .calc-tecla { font-size: 23px; }
}
@container (min-height: 640px) {
  .calc-resultado { font-size: 62px; height: 72px; line-height: 72px; }
  .calc-resultado.calc-error { line-height: 72px; }
}

@media (prefers-reduced-motion: reduce) {
  .calc-cinta { animation: none; }
  .calc-tecla { transition: none; }
}