*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  background: #000;
  color: #fff;
  overflow: hidden;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

#stage {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  background: #000;
  overflow: hidden;
  padding: env(safe-area-inset-top) env(safe-area-inset-right)
    env(safe-area-inset-bottom) env(safe-area-inset-left);
}

#logo {
  position: absolute;
  left: 0;
  top: 0;
  width: min(42vw, 320px);
  will-change: transform;
  transform: translate3d(0, 0, 0);
  transform-origin: center center;
  filter: drop-shadow(0 0 0 transparent);
  transition: filter 0.05s linear;
}

#logo img {
  display: block;
  width: 100%;
  height: auto;
  pointer-events: none;
}

@media (max-width: 600px) {
  #logo {
    width: min(58vw, 240px);
  }
}

@media (orientation: portrait) and (max-width: 900px) {
  #logo {
    width: min(70vw, 280px);
  }
}

#flash {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: #fff;
  opacity: 0;
  z-index: 5;
}

#flash.active {
  animation: screen-flash 0.55s ease-out forwards;
}

@keyframes screen-flash {
  0% {
    opacity: 0.92;
    background: #fff;
  }
  18% {
    opacity: 0.55;
    background: #dff140;
  }
  100% {
    opacity: 0;
    background: #fff;
  }
}

#burst {
  position: absolute;
  width: 0;
  height: 0;
  left: 0;
  top: 0;
  pointer-events: none;
  z-index: 4;
}

#burst .ray {
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: min(28vw, 160px);
  margin-left: -2px;
  margin-top: calc(min(28vw, 160px) * -0.5);
  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.95),
    rgba(223, 241, 64, 0.7),
    transparent
  );
  transform-origin: 50% 50%;
  opacity: 0;
}

#burst.firing .ray {
  animation: ray-burst 0.85s cubic-bezier(0.15, 0.85, 0.25, 1) forwards;
}

@keyframes ray-burst {
  0% {
    opacity: 1;
    transform: rotate(var(--rot)) scaleY(0.15);
  }
  35% {
    opacity: 1;
    transform: rotate(var(--rot)) scaleY(1.15);
  }
  100% {
    opacity: 0;
    transform: rotate(var(--rot)) scaleY(1.45) translateY(-20%);
  }
}

#burst .ring {
  position: absolute;
  left: 0;
  top: 0;
  width: min(40vw, 220px);
  height: min(40vw, 220px);
  margin: calc(min(40vw, 220px) * -0.5) 0 0 calc(min(40vw, 220px) * -0.5);
  border: 3px solid #dff140;
  border-radius: 50%;
  opacity: 0;
  box-shadow: 0 0 24px rgba(223, 241, 64, 0.6);
}

#burst.firing .ring {
  animation: ring-expand 0.8s ease-out forwards;
}

#burst .ring.delay {
  animation-delay: 0.08s;
  border-color: #fff;
  border-width: 2px;
}

@keyframes ring-expand {
  0% {
    opacity: 1;
    transform: scale(0.2);
  }
  100% {
    opacity: 0;
    transform: scale(2.4);
  }
}

#logo.celebrate {
  animation: logo-celebrate 0.9s cubic-bezier(0.2, 1.4, 0.3, 1) forwards;
  filter: drop-shadow(0 0 18px rgba(223, 241, 64, 0.95))
    drop-shadow(0 0 40px rgba(255, 255, 255, 0.55));
}

@keyframes logo-celebrate {
  0% {
    transform: translate3d(var(--x), var(--y), 0) scale(1) rotate(0deg);
  }
  22% {
    transform: translate3d(var(--x), var(--y), 0) scale(1.45) rotate(-8deg);
  }
  48% {
    transform: translate3d(var(--x), var(--y), 0) scale(1.2) rotate(10deg);
  }
  72% {
    transform: translate3d(var(--x), var(--y), 0) scale(1.35) rotate(-4deg);
  }
  100% {
    transform: translate3d(var(--x), var(--y), 0) scale(1) rotate(0deg);
  }
}

#corner-banner {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 6;
  text-align: center;
  pointer-events: none;
  opacity: 0;
}

#corner-banner.show {
  animation: banner-pop 1.1s ease-out forwards;
}

.corner-label {
  display: block;
  font-weight: 800;
  letter-spacing: 0.35em;
  font-size: clamp(1.4rem, 6vw, 3rem);
  margin-left: 0.35em;
  text-shadow: 0 0 24px rgba(223, 241, 64, 0.9), 0 0 4px #fff;
  color: #dff140;
}

.corner-count {
  display: block;
  margin-top: 0.35rem;
  font-size: clamp(0.85rem, 3vw, 1.25rem);
  letter-spacing: 0.2em;
  color: #fff;
  opacity: 0.85;
}

@keyframes banner-pop {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.6);
  }
  15% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.12);
  }
  70% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(1.05);
  }
}

#hint {
  position: absolute;
  left: 50%;
  bottom: max(1rem, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.28);
  z-index: 3;
  pointer-events: none;
  transition: opacity 0.6s ease;
}

#hint.fade {
  opacity: 0;
}

body.corner-mode #stage {
  animation: stage-pulse 0.55s ease-out;
}

@keyframes stage-pulse {
  0% {
    box-shadow: inset 0 0 0 0 #dff140;
  }
  30% {
    box-shadow: inset 0 0 0 6px #dff140;
  }
  100% {
    box-shadow: inset 0 0 0 0 transparent;
  }
}

@media (prefers-reduced-motion: reduce) {
  #flash.active,
  #burst.firing .ray,
  #burst.firing .ring,
  #logo.celebrate,
  #corner-banner.show,
  body.corner-mode #stage {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}