.aztec-intro {
  position: fixed;
  inset: 0;
  background: #000;
  z-index: 2147483647;
  overflow: hidden;
  display: none; /* shown only after qualifying first interaction */
  place-items: center;
  opacity: 1;
  touch-action: manipulation;
}

.aztec-intro__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 1;
  transition: opacity 420ms ease;
}

.aztec-intro__stage {
  position: relative;
  width: min(680px, 88vw);
  height: min(680px, 88vw);
  display: grid;
  place-items: center;
  transform: translateZ(0);
  z-index: 2;
  opacity: 1;
  transition: opacity 420ms ease;
}

.aztec-intro__stage.is-shaking {
  animation: shakeLoop 0.7s ease-in-out infinite;
}

.aztec-intro__logo {
  width: min(520px, 78vw);
  height: auto;
  opacity: 0;
  transform: scale(0.03) rotate(-8deg);
  filter:
    drop-shadow(0 0 18px hsla(0, 90%, 72%, 0.32))
    drop-shadow(0 0 70px hsla(20, 95%, 60%, 0.26))
    drop-shadow(0 0 120px hsla(40, 95%, 55%, 0.18));
  will-change: transform, opacity, filter;
  transition: opacity 420ms ease, transform 420ms ease, filter 420ms ease;
}

.aztec-intro__shockwave {
  position: absolute;
  width: 12px;
  height: 12px;
  border: 2px solid rgba(255, 200, 120, 0.65);
  border-radius: 50%;
  opacity: 0;
  transform: scale(1);
  will-change: transform, opacity;
}

.aztec-intro__vignette {
  position: absolute;
  inset: -20%;
  background: radial-gradient(circle at center,
    rgba(0,0,0,0) 0%,
    rgba(0,0,0,0.35) 50%,
    rgba(0,0,0,0.85) 78%,
    rgba(0,0,0,1) 100%);
  pointer-events: none;
  z-index: 1;
  opacity: 1;
  transition: opacity 420ms ease;
}

.aztec-intro__controls {
  position: absolute;
  left: 0;
  right: 0;
  bottom: max(18px, env(safe-area-inset-bottom));
  display: flex;
  justify-content: center;
  pointer-events: none;
}

.aztec-intro__skip {
  pointer-events: auto;
  appearance: none;
  border: 1px solid rgba(255,255,255,0.25);
  background: rgba(0,0,0,0.55);
  color: #fff;
  padding: 10px 14px;
  border-radius: 10px;
  font: 600 14px/1 system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  letter-spacing: 0.2px;
  backdrop-filter: blur(6px);
}

.aztec-intro__skip:focus {
  outline: 3px solid rgba(255, 220, 160, 0.9);
  outline-offset: 3px;
}

.aztec-intro__sr {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.aztec-intro.is-fading .aztec-intro__stage,
.aztec-intro.is-fading .aztec-intro__canvas,
.aztec-intro.is-fading .aztec-intro__vignette {
  opacity: 0;
}

@keyframes aztecLogoBoom {
  0%   { opacity: 0; transform: scale(0.03) rotate(-8deg); }
  18%  { opacity: 1; transform: scale(1.38) rotate(3deg); }
  44%  { opacity: 1; transform: scale(0.90) rotate(-1deg); }
  66%  { opacity: 1; transform: scale(1.05) rotate(0.5deg); }
  100% { opacity: 1; transform: scale(1.00) rotate(0deg); }
}

@keyframes glowPulse {
  0% {
    filter:
      drop-shadow(0 0 20px hsla(0, 90%, 70%, 0.34))
      drop-shadow(0 0 80px hsla(20, 95%, 60%, 0.28))
      drop-shadow(0 0 140px hsla(35, 95%, 55%, 0.18));
  }
  16% {
    filter:
      drop-shadow(0 0 24px hsla(50, 95%, 65%, 0.38))
      drop-shadow(0 0 90px hsla(70, 95%, 55%, 0.30))
      drop-shadow(0 0 160px hsla(90, 95%, 50%, 0.20));
  }
  33% {
    filter:
      drop-shadow(0 0 26px hsla(120, 90%, 62%, 0.38))
      drop-shadow(0 0 95px hsla(140, 90%, 50%, 0.30))
      drop-shadow(0 0 170px hsla(160, 95%, 45%, 0.20));
  }
  50% {
    filter:
      drop-shadow(0 0 28px hsla(190, 95%, 60%, 0.38))
      drop-shadow(0 0 105px hsla(200, 95%, 50%, 0.30))
      drop-shadow(0 0 180px hsla(210, 95%, 45%, 0.20));
  }
  66% {
    filter:
      drop-shadow(0 0 26px hsla(230, 95%, 65%, 0.38))
      drop-shadow(0 0 95px hsla(250, 95%, 55%, 0.30))
      drop-shadow(0 0 170px hsla(270, 95%, 50%, 0.20));
  }
  83% {
    filter:
      drop-shadow(0 0 24px hsla(290, 95%, 70%, 0.36))
      drop-shadow(0 0 90px hsla(310, 95%, 60%, 0.28))
      drop-shadow(0 0 160px hsla(330, 95%, 55%, 0.20));
  }
  100% {
    filter:
      drop-shadow(0 0 20px hsla(360, 90%, 70%, 0.34))
      drop-shadow(0 0 80px hsla(20, 95%, 60%, 0.28))
      drop-shadow(0 0 140px hsla(35, 95%, 55%, 0.18));
  }
}

@keyframes shockwaveExpand {
  0%   { opacity: 0; transform: scale(1); }
  8%   { opacity: 0.9; }
  100% { opacity: 0; transform: scale(140); }
}

@keyframes shake {
  0%   { transform: translate(0, 0); }
  20%  { transform: translate(-4px, 3px); }
  40%  { transform: translate(3px, -3px); }
  60%  { transform: translate(-2px, 2px); }
  80%  { transform: translate(2px, -1px); }
  100% { transform: translate(0, 0); }
}

@keyframes shakeLoop {
  0%   { transform: translate3d(0, 0, 0) rotate(0deg); }
  12%  { transform: translate3d(-6px, 4px, 0) rotate(-0.7deg); }
  25%  { transform: translate3d(7px, -5px, 0) rotate(0.8deg); }
  38%  { transform: translate3d(-8px, -3px, 0) rotate(-0.6deg); }
  50%  { transform: translate3d(6px, 5px, 0) rotate(0.7deg); }
  62%  { transform: translate3d(-5px, 6px, 0) rotate(-0.5deg); }
  75%  { transform: translate3d(8px, -4px, 0) rotate(0.9deg); }
  88%  { transform: translate3d(-6px, 3px, 0) rotate(-0.6deg); }
  100% { transform: translate3d(0, 0, 0) rotate(0deg); }
}

@media (prefers-reduced-motion: reduce) {
  .aztec-intro__logo {
    opacity: 1 !important;
    transform: scale(1) !important;
    animation: none !important;
  }
  .aztec-intro__shockwave { display: none !important; }
}