/* ============================================================
   Dexatron intro experience: welcome screen + warp transition
   ============================================================ */

body.intro-locked{
  overflow: hidden;
  height: 100vh;
}

.intro-overlay{
  position: fixed;
  inset: 0;
  z-index: 5000;
  background: var(--bg);
  overflow: hidden;
  opacity: 1;
  transition: opacity 0.7s ease;
}
.intro-overlay.hidden{
  opacity: 0;
  pointer-events: none;
}

.intro-welcome{
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.intro-welcome.fade-out{
  opacity: 0;
  transform: scale(1.04);
}
.intro-welcome-image{
  max-width: min(92vw, 980px);
  max-height: min(70vh, calc(100vh - 160px));
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  box-shadow: 0 20px 54px rgba(0,0,0,.42), 0 0 28px rgba(112,217,154,.1);
}
.intro-welcome-content{
  position: relative;
  z-index: 1;
  width: 100%;
  padding: 24px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  animation: introContentIn 1.4s ease both;
}
@keyframes introContentIn{
  0%{ opacity: 0; transform: translateY(18px); }
  100%{ opacity: 1; transform: translateY(0); }
}
.intro-explore{
  font-size: 18px;
  font-weight: 700;
  padding: 20px 56px;
  letter-spacing: 0.04em;
  position: relative;
  box-shadow:0 8px 22px rgba(35,112,65,.3);
}
.intro-explore::after{
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 999px;
  border:1px solid rgba(184,232,199,.38);
  animation:introPulse 3.8s ease-in-out infinite;
}
@keyframes introPulse{
  0%, 100%{ transform:scale(1); opacity:.38; }
  50%{ transform:scale(1.04); opacity:0; }
}

.intro-warp-canvas{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}
.intro-warp-canvas.active{
  opacity: 1;
}

@media (prefers-reduced-motion: reduce){
  .intro-welcome-content{ animation: none; opacity: 1; transform: none; }
  .intro-explore::after{ animation: none; }
  .intro-welcome{ transition: opacity 0.4s ease; }
}