/* Pantalla de carga (inspirada en teletech.events): negro con grano, logo, esquinas y cuadrícula que se apaga */
body.is-loading { overflow: hidden; }

.loader {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  color: var(--c-ink);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  pointer-events: auto;
}
/* La cuadrícula es el fondo negro: al salir cada cuadro se apaga con su propio retraso */
.loader__grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: grid;
  grid-auto-rows: 1fr;
}
/* La sombra de 1px tapa las rendijas de subpíxel entre cuadros (se veía la página por las juntas) */
.loader__grid span { background: #000; box-shadow: 0 0 0 1px #000; transition: opacity 0.01s linear; }
.loader.is-leaving .loader__grid span { opacity: 0; }
.loader.is-leaving { pointer-events: none; }

/* Grano animado (ruido SVG) y parpadeo, como en Teletech */
.loader__grain {
  position: absolute;
  inset: -50%;
  z-index: 2;
  pointer-events: none;
  opacity: 0.14;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  animation: grain 0.6s steps(6) infinite;
}
@keyframes grain {
  0% { transform: translate(0, 0); }
  20% { transform: translate(-6%, 4%); }
  40% { transform: translate(5%, -6%); }
  60% { transform: translate(-4%, -3%); }
  80% { transform: translate(6%, 5%); }
}

.loader__corner, .loader__center { position: relative; z-index: 3; transition: opacity 0.35s ease; }
.loader.is-leaving .loader__corner,
.loader.is-leaving .loader__center,
.loader.is-leaving .loader__grain { opacity: 0; }
.loader__corner {
  position: absolute;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-ink-dim);
}
.loader__corner--tl { top: var(--sp-5); left: var(--sp-5); color: var(--c-red); }
.loader__corner--tr { top: var(--sp-5); right: var(--sp-5); }
.loader__corner--bl { bottom: var(--sp-5); left: var(--sp-5); }
.loader__corner--br { bottom: var(--sp-5); right: var(--sp-5); }
[data-loader-percent] { color: var(--c-ink); font-weight: 700; }

.loader__center { display: grid; justify-items: center; gap: var(--sp-3); text-align: center; }
.loader__logo {
  width: min(46vw, 220px);
  height: auto;
  animation: flicker 2.6s steps(1) infinite, breathe-logo 2.2s ease-in-out infinite;
  filter: drop-shadow(0 0 24px rgba(255, 31, 45, 0.45));
}
@keyframes flicker {
  0%, 18%, 22%, 60%, 63%, 100% { opacity: 1; }
  20%, 61% { opacity: 0.55; }
}
@keyframes breathe-logo { 50% { transform: scale(1.04); } }
.loader__name {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 8vw, 2.6rem);
  letter-spacing: 0.4em;
  margin-right: -0.4em;
}
/* Barra de carga: se llena sola con el avance real */
.loader__bar {
  width: min(64vw, 280px);
  height: 3px;
  margin-top: var(--sp-4);
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}
.loader__bar span {
  display: block;
  height: 100%;
  background: var(--c-red);
  box-shadow: 0 0 12px var(--c-red);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-out);
}
.loader__hint { font-size: 0.62rem; letter-spacing: 0.25em; text-transform: uppercase; color: var(--c-ink-dim); animation: breathe 1.6s ease-in-out infinite; }
.loader__hint[hidden] { display: none; }

/* Botón de música, fijo en la esquina una vez que suena */
.sound-toggle {
  position: fixed;
  right: var(--sp-4);
  bottom: var(--sp-4);
  z-index: 60;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  color: var(--c-ink);
  cursor: pointer;
}
.sound-toggle[hidden] { display: none; }
.sound-toggle svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.sound-toggle:focus-visible { outline: 2px solid var(--c-cyan); outline-offset: 3px; }

/* Recuadro del modo diagnóstico (?debug) */
.debug-box {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  max-width: calc(100vw - 16px);
  margin: 0;
  padding: 8px 10px;
  background: rgba(0, 0, 0, 0.85);
  border: 1px solid var(--c-red);
  color: #9effa8;
  font: 11px/1.4 'JetBrains Mono', ui-monospace, monospace;
  white-space: pre-wrap;
  word-break: break-word;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .loader__grain, .loader__logo, .loader__hint { animation: none; }
}