@import url('https://fonts.googleapis.com/css2?family=Creepster&family=Orbitron:wght@400;700&family=Special+Elite&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  background: linear-gradient(135deg, #0a0a0a 0%, #1a0000 25%, #000 50%, #1a0000 75%, #0a0a0a 100%);
  background-size: 400% 400%;
  animation: gradientShift 8s ease-in-out infinite;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  font-family: 'Creepster', cursive;
  color: #ff0000;
  position: relative;
}

/* Camera motion during fall */
body.fall-sequence {
  animation: cameraFall 2.6s cubic-bezier(.2,.8,.2,1) forwards;
}

/* Bluish flame-like background structure */
.flame-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.flame {
  position: absolute;
  bottom: -50px;
  width: 100px;
  height: 200px;
  background: linear-gradient(to top, 
    rgba(0, 150, 255, 0.8) 0%,
    rgba(0, 200, 255, 0.6) 30%,
    rgba(100, 200, 255, 0.4) 60%,
    rgba(150, 220, 255, 0.2) 80%,
    transparent 100%);
  border-radius: 50% 50% 20% 20%;
  filter: blur(3px);
  animation: flameFlicker 3s ease-in-out infinite;
}

.flame-1 {
  left: 10%;
  animation-delay: 0s;
  animation-duration: 4s;
  height: 250px;
  width: 120px;
}

.flame-2 {
  left: 25%;
  animation-delay: 1s;
  animation-duration: 3.5s;
  height: 200px;
  width: 100px;
}

.flame-3 {
  left: 40%;
  animation-delay: 2s;
  animation-duration: 4.5s;
  height: 280px;
  width: 140px;
}

.flame-4 {
  left: 55%;
  animation-delay: 0.5s;
  animation-duration: 3s;
  height: 220px;
  width: 110px;
}

.flame-5 {
  left: 70%;
  animation-delay: 1.5s;
  animation-duration: 4s;
  height: 260px;
  width: 130px;
}

.flame-6 {
  left: 85%;
  animation-delay: 2.5s;
  animation-duration: 3.8s;
  height: 240px;
  width: 120px;
}

@keyframes flameFlicker {
  0%, 100% {
    transform: scaleY(1) scaleX(1);
    opacity: 0.8;
    filter: blur(3px) brightness(1);
  }
  25% {
    transform: scaleY(1.1) scaleX(0.9);
    opacity: 1;
    filter: blur(2px) brightness(1.2);
  }
  50% {
    transform: scaleY(0.9) scaleX(1.1);
    opacity: 0.6;
    filter: blur(4px) brightness(0.8);
  }
  75% {
    transform: scaleY(1.05) scaleX(0.95);
    opacity: 0.9;
    filter: blur(2.5px) brightness(1.1);
  }
}

/* Animated background */
body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(255, 0, 0, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 0, 0, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(255, 0, 0, 0.05) 0%, transparent 50%);
  animation: backgroundPulse 6s ease-in-out infinite;
}

/* Vignette overlay intensifies during fall */
.vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 50% 50%, rgba(0,0,0,0) 40%, rgba(0,0,0,0.65) 85%);
  opacity: 0.25;
  transition: opacity 0.8s ease;
  z-index: 900;
}

.fall-sequence .vignette {
  opacity: 0.8;
}

/* Parallax cave walls */
.cave-layers { position: fixed; inset: 0; pointer-events: none; z-index: 800; overflow: hidden; }
.cave-layer {
  position: absolute;
  width: 180%;
  left: -40%;
  height: 160%;
  top: -30%;
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  opacity: 0.18;
  filter: blur(2px) contrast(1.1);
  transform: translateY(0) scale(1);
}
.cave-layer.layer-1 { background-image: radial-gradient(ellipse at 50% 60%, rgba(20,20,30,.9) 0%, rgba(10,10,16,.3) 60%, transparent 75%); z-index: 1; }
.cave-layer.layer-2 { background-image: radial-gradient(ellipse at 40% 50%, rgba(12,12,18,.9) 0%, rgba(6,6,10,.3) 60%, transparent 78%); z-index: 2; opacity: .22; filter: blur(3px) contrast(1.2); }
.cave-layer.layer-3 { background-image: radial-gradient(ellipse at 60% 40%, rgba(8,8,14,.95) 0%, rgba(4,4,8,.35) 55%, transparent 80%); z-index: 3; opacity: .28; filter: blur(4px) contrast(1.25); }

.fall-sequence .layer-1 { animation: layerDrift1 2.4s cubic-bezier(.2,.9,.2,1) forwards; }
.fall-sequence .layer-2 { animation: layerDrift2 2.4s cubic-bezier(.2,.9,.2,1) forwards; }
.fall-sequence .layer-3 { animation: layerDrift3 2.4s cubic-bezier(.2,.9,.2,1) forwards; }

/* Speed lines rush upward */
.speed-lines { position: fixed; inset: 0; z-index: 850; pointer-events: none; overflow: hidden; }
.speed-line {
  position: absolute;
  width: 2px;
  height: 20vh;
  top: 110%;
  background: linear-gradient(to top, rgba(255,255,255,0), rgba(0, 200, 255, .65));
  filter: blur(1px);
  transform: translateY(0) translateX(0);
  opacity: 0;
}

.fall-sequence .speed-line { animation: speedRush 1.6s linear forwards; }

/* Debris silhouettes */
.debris-field { position: fixed; inset: 0; pointer-events: none; z-index: 860; overflow: hidden; }
.debris { position: absolute; bottom: -10vh; width: 0; height: 0; border-left: 10px solid transparent; border-right: 6px solid transparent; border-top: 18px solid rgba(20,20,26,0.8); filter: blur(1px); opacity: 0; transform: translateY(0) rotate(0deg) scale(1); }
.fall-sequence .debris { animation: debrisRise 1.8s cubic-bezier(.2,.7,.2,1) forwards; }

/* Volumetric dust */
.dust { position: fixed; inset: 0; pointer-events: none; z-index: 845; overflow: hidden; }
.dust-dot { position: absolute; width: 6px; height: 6px; border-radius: 50%; background: radial-gradient(circle, rgba(255,255,255,.18) 0%, rgba(255,255,255,0) 70%); filter: blur(2px); opacity: .0; transform: translateY(0); }
.fall-sequence .dust-dot { animation: dustDrift 3.2s ease-in-out forwards; }

/* Lens refraction portal (center) */
.lens { position: fixed; left: 50%; top: 50%; width: 60vmin; height: 60vmin; transform: translate(-50%, -50%); border-radius: 50%; pointer-events: none; z-index: 950; mix-blend-mode: screen; opacity: 0; }
.fall-sequence .lens { animation: lensPulse 1.4s ease-in-out forwards; }
.lens::before { content: ''; position: absolute; inset: 0; border-radius: 50%; background: radial-gradient(circle at 50% 50%, rgba(120,200,255,0.18), rgba(0,0,0,0) 60%); filter: blur(6px) saturate(1.2) contrast(1.1); }
.lens::after { content: ''; position: absolute; inset: 8%; border-radius: 50%; border: 1px solid rgba(120,200,255,0.25); box-shadow: 0 0 24px rgba(120,200,255,0.35) inset; }

/* Chromatic aberration flash */
.aberration { position: fixed; inset: 0; pointer-events: none; z-index: 970; mix-blend-mode: screen; opacity: 0; }
.fall-sequence .aberration { animation: aberrate 0.5s ease-in-out forwards; }
.aberration::before, .aberration::after { content: ''; position: absolute; inset: 0; }
.aberration::before { background: radial-gradient(circle at 50% 55%, rgba(255,0,80,0.12), transparent 60%); transform: translateX(-2px); filter: blur(1px); }
.aberration::after { background: radial-gradient(circle at 50% 45%, rgba(0,160,255,0.12), transparent 60%); transform: translateX(2px); filter: blur(1px); }

/* Floating particles */
.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: #ff0000;
  border-radius: 50%;
  animation: float 6s infinite linear;
}

.particle:nth-child(1) { left: 10%; animation-delay: 0s; animation-duration: 8s; }
.particle:nth-child(2) { left: 20%; animation-delay: 1s; animation-duration: 10s; }
.particle:nth-child(3) { left: 30%; animation-delay: 2s; animation-duration: 7s; }
.particle:nth-child(4) { left: 40%; animation-delay: 3s; animation-duration: 9s; }
.particle:nth-child(5) { left: 50%; animation-delay: 4s; animation-duration: 6s; }
.particle:nth-child(6) { left: 60%; animation-delay: 5s; animation-duration: 8s; }
.particle:nth-child(7) { left: 70%; animation-delay: 6s; animation-duration: 10s; }
.particle:nth-child(8) { left: 80%; animation-delay: 7s; animation-duration: 7s; }
.particle:nth-child(9) { left: 90%; animation-delay: 8s; animation-duration: 9s; }

.container {
  text-align: center;
  z-index: 10;
  position: relative;
  background: rgba(0, 0, 0, 0.3);
  padding: 3rem 4rem;
  border-radius: 20px;
  border: 1px solid rgba(255, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  box-shadow: 
    0 0 30px rgba(255, 0, 0, 0.2),
    inset 0 0 30px rgba(255, 0, 0, 0.1);
  animation: containerGlow 4s ease-in-out infinite;
  transition: all 0.8s ease;
}

.container.falling {
  transform: translateY(100vh) scale(0.1);
  opacity: 0;
  filter: blur(20px);
}

.title {
  font-size: 4.5rem;
  margin-bottom: 2.5rem;
  text-shadow: 
    0 0 20px #ff0000, 
    0 0 40px #b30000,
    0 0 60px #800000;
  animation: flicker 3s infinite, titleFloat 4s ease-in-out infinite;
  letter-spacing: 2px;
  background: linear-gradient(45deg, #ff0000, #ff4444, #ff0000);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: 
    flicker 3s infinite, 
    titleFloat 4s ease-in-out infinite,
    gradientShift 3s ease-in-out infinite;
  transition: all 0.8s ease;
}

/* Stranger Things Intro Font Styling */
.stranger-things-font {
  font-family: 'Special Elite', monospace !important;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 8px;
  font-size: 5rem;
  background: linear-gradient(45deg, 
    #00aaff 0%, 
    #0088ff 25%, 
    #0066cc 50%, 
    #004499 75%, 
    #002266 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 
    0 0 20px #00aaff, 
    0 0 40px #0088ff,
    0 0 60px #0066cc,
    0 0 80px #004499;
  animation: 
    strangerThingsGlow 4s ease-in-out infinite,
    titleFloat 4s ease-in-out infinite;
}

.title.falling {
  transform: translateY(100vh) scale(0.1);
  opacity: 0;
  filter: blur(20px);
}

.subtitle {
  font-family: 'Orbitron', monospace;
  font-size: 1.2rem;
  color: #ff6666;
  margin-bottom: 2rem;
  text-shadow: 0 0 10px #ff0000;
  opacity: 0.8;
  animation: subtitlePulse 2s ease-in-out infinite;
  transition: all 0.8s ease;
}

.subtitle.falling {
  transform: translateY(100vh) scale(0.1);
  opacity: 0;
  filter: blur(20px);
}

#enterBtn {
  font-size: 1.8rem;
  padding: 18px 45px;
  border: 2px solid #ff0000;
  background: linear-gradient(45deg, transparent, rgba(255, 0, 0, 0.1), transparent);
  background-size: 200% 200%;
  color: #ff0000;
  border-radius: 15px;
  cursor: pointer;
  transition: all 0.4s ease;
  text-shadow: 0 0 15px #ff0000;
  font-family: 'Creepster', cursive;
  position: relative;
  overflow: hidden;
  animation: buttonGlow 2s ease-in-out infinite;
}

#enterBtn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
}

#enterBtn:hover::before {
  left: 100%;
}

#enterBtn:hover {
  background: linear-gradient(45deg, #ff0000, #cc0000);
  color: #000;
  box-shadow: 
    0 0 30px #ff0000, 
    0 0 60px #ff0000,
    0 0 90px #ff0000;
  transform: translateY(-3px) scale(1.05);
  border-color: #ff4444;
}

#enterBtn:active {
  transform: translateY(0) scale(0.98);
}

#enterBtn.falling {
  transform: translateY(100vh) scale(0.1);
  opacity: 0;
  filter: blur(20px);
}

/* Falling tunnel effect */
.falling-tunnel {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, transparent 0%, #000 70%);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: all 2s ease;
}

.falling-tunnel.active {
  opacity: 1;
  animation: tunnelFall 2s ease-in-out forwards;
}

/* Cave entrance effect */
.cave-entrance {
  position: fixed;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: radial-gradient(circle, #000 0%, transparent 100%);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: all 1.5s ease;
}

.cave-entrance.active {
  opacity: 1;
  width: 100vw;
  height: 100vh;
  animation: caveExpand 1.5s ease-in-out forwards;
}

/* Thunder and lightning effects */
.thunder {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.lightning {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, 
    rgba(255, 255, 255, 0.1) 0%, 
    rgba(255, 255, 255, 0.3) 25%, 
    rgba(255, 255, 255, 0.1) 50%, 
    rgba(255, 255, 255, 0.3) 75%, 
    rgba(255, 255, 255, 0.1) 100%);
  opacity: 0;
  animation: lightning 8s infinite;
}

.lightning:nth-child(2) {
  animation-delay: 3s;
  background: linear-gradient(-45deg, 
    rgba(255, 255, 255, 0.1) 0%, 
    rgba(255, 255, 255, 0.4) 25%, 
    rgba(255, 255, 255, 0.1) 50%, 
    rgba(255, 255, 255, 0.4) 75%, 
    rgba(255, 255, 255, 0.1) 100%);
}

.lightning:nth-child(3) {
  animation-delay: 6s;
  background: linear-gradient(90deg, 
    rgba(255, 255, 255, 0.1) 0%, 
    rgba(255, 255, 255, 0.2) 25%, 
    rgba(255, 255, 255, 0.1) 50%, 
    rgba(255, 255, 255, 0.2) 75%, 
    rgba(255, 255, 255, 0.1) 100%);
}

/* Rain effect */
.rain {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
}

.raindrop {
  position: absolute;
  width: 1px;
  height: 20px;
  background: linear-gradient(to bottom, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: rain 1s linear infinite;
}

.raindrop:nth-child(1) { left: 5%; animation-delay: 0s; animation-duration: 0.8s; }
.raindrop:nth-child(2) { left: 15%; animation-delay: 0.1s; animation-duration: 1.2s; }
.raindrop:nth-child(3) { left: 25%; animation-delay: 0.2s; animation-duration: 0.9s; }
.raindrop:nth-child(4) { left: 35%; animation-delay: 0.3s; animation-duration: 1.1s; }
.raindrop:nth-child(5) { left: 45%; animation-delay: 0.4s; animation-duration: 0.7s; }
.raindrop:nth-child(6) { left: 55%; animation-delay: 0.5s; animation-duration: 1.3s; }
.raindrop:nth-child(7) { left: 65%; animation-delay: 0.6s; animation-duration: 0.8s; }
.raindrop:nth-child(8) { left: 75%; animation-delay: 0.7s; animation-duration: 1.0s; }
.raindrop:nth-child(9) { left: 85%; animation-delay: 0.8s; animation-duration: 1.1s; }
.raindrop:nth-child(10) { left: 95%; animation-delay: 0.9s; animation-duration: 0.9s; }

/* Animations */
@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

@keyframes backgroundPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.6; }
}

@keyframes float {
  0% { 
    top: 100vh; 
    opacity: 0; 
    transform: translateX(0) rotate(0deg);
  }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { 
    top: -10px; 
    opacity: 0; 
    transform: translateX(100px) rotate(360deg);
  }
}

@keyframes flicker {
  0%, 18%, 22%, 25%, 53%, 57%, 100% { opacity: 1; }
  20%, 24%, 55% { opacity: 0.3; }
}

@keyframes titleFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

@keyframes subtitlePulse {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
}

@keyframes containerGlow {
  0%, 100% { 
    box-shadow: 
      0 0 30px rgba(255, 0, 0, 0.2),
      inset 0 0 30px rgba(255, 0, 0, 0.1);
  }
  50% { 
    box-shadow: 
      0 0 50px rgba(255, 0, 0, 0.4),
      inset 0 0 50px rgba(255, 0, 0, 0.2);
  }
}

@keyframes buttonGlow {
  0%, 100% { 
    box-shadow: 0 0 20px rgba(255, 0, 0, 0.3);
  }
  50% { 
    box-shadow: 0 0 30px rgba(255, 0, 0, 0.6);
  }
}

@keyframes tunnelFall {
  0% {
    transform: scale(1) translateY(0);
    opacity: 0;
  }
  50% {
    transform: scale(1.2) translateY(-20px);
    opacity: 1;
  }
  100% {
    transform: scale(2) translateY(-100px);
    opacity: 1;
  }
}

@keyframes caveExpand {
  0% {
    width: 0;
    height: 0;
    opacity: 0;
  }
  50% {
    width: 50vw;
    height: 50vh;
    opacity: 0.8;
  }
  100% {
    width: 100vw;
    height: 100vh;
    opacity: 1;
  }
}

/* New motion animations */
@keyframes cameraFall { 0% { transform: perspective(900px) translateZ(0) rotateZ(0deg) translateY(0); filter: blur(0) saturate(1); } 30% { transform: perspective(900px) translateZ(80px) rotateZ(1deg) translateY(-10px); } 60% { transform: perspective(900px) translateZ(220px) rotateZ(-2deg) translateY(-30px); filter: blur(1px) saturate(1.1); } 100% { transform: perspective(900px) translateZ(420px) rotateZ(3deg) translateY(-80px) scale(1.1); filter: blur(1.5px) saturate(1.2); } }
@keyframes layerDrift1 { 0% { transform: translateY(0) scale(1); } 100% { transform: translateY(-30%) scale(1.05); } }
@keyframes layerDrift2 { 0% { transform: translateY(0) scale(1); } 100% { transform: translateY(-45%) scale(1.08); } }
@keyframes layerDrift3 { 0% { transform: translateY(0) scale(1); } 100% { transform: translateY(-65%) scale(1.12); } }
@keyframes speedRush { 0% { opacity: 0; transform: translateY(0) translateX(0); } 10% { opacity: 1; } 100% { opacity: 0; transform: translateY(-140%) translateX(10px); } }
@keyframes debrisRise { 0% { opacity: 0; transform: translateY(0) rotate(0deg) scale(0.8); } 20% { opacity: .8; } 100% { opacity: 0; transform: translateY(-130vh) rotate(180deg) scale(1.05); } }
@keyframes dustDrift { 0% { opacity: 0; transform: translateY(0) translateX(0); } 20% { opacity: .35; } 100% { opacity: 0; transform: translateY(-35vh) translateX(10vw); } }
@keyframes lensPulse { 0% { opacity: 0; transform: translate(-50%, -50%) scale(0.9); } 50% { opacity: .9; transform: translate(-50%, -50%) scale(1.02); } 100% { opacity: .0; transform: translate(-50%, -50%) scale(1.1); } }
@keyframes aberrate { 0% { opacity: 0; } 40% { opacity: .9; } 100% { opacity: 0; } }

/* Thunder and lightning animations */
@keyframes lightning {
  0%, 90%, 100% {
    opacity: 0;
  }
  5%, 15% {
    opacity: 0.8;
  }
  10% {
    opacity: 0.4;
  }
}

@keyframes rain {
  0% {
    top: -20px;
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    top: 100vh;
    opacity: 0;
  }
}

/* Stranger Things specific animations */
@keyframes strangerThingsGlow {
  0%, 100% {
    background-position: 0% 50%;
    text-shadow: 
      0 0 20px #00aaff, 
      0 0 40px #0088ff,
      0 0 60px #0066cc,
      0 0 80px #004499;
  }
  50% {
    background-position: 100% 50%;
    text-shadow: 
      0 0 30px #00aaff, 
      0 0 50px #0088ff,
      0 0 70px #0066cc,
      0 0 90px #004499,
      0 0 110px #002266;
  }
}

/* Responsive design */
@media (max-width: 768px) {
  .title {
    font-size: 3rem;
  }
  
  .stranger-things-font {
    font-size: 2.5rem;
    letter-spacing: 4px;
  }
  
  .container {
    padding: 2rem;
    margin: 1rem;
  }
  
  #enterBtn {
    font-size: 1.5rem;
    padding: 15px 35px;
  }
  
  .flame {
    width: 60px;
    height: 120px;
  }
}