/* Force GPU acceleration for layers and GIFs only */
.layer, .traveling-gif {
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

/* Reset and body */
body {
  margin: 0;
  padding: 0;
  background: #002233;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  width: 100vw;
  height: 100vh;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: none;
  touch-action: none;
}

/* Parallax container */
.parallax-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 1920px;
  height: 1080px;
  overflow: hidden;
  background: #002233;
  transform-origin: top left;
  box-sizing: border-box;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-perspective: 1000px;
  perspective: 1000px;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  visibility: hidden;
  pointer-events: none; /* allow button clicks */
}

.parallax-container.ready {
  visibility: visible;
}

/* Parallax layers */
.layer {
  position: absolute;
  display: flex;
  top: 0;
  left: 0;
  height: 1080px;
  width: 3840px;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
  opacity: 0;
  transition: none;
}

.layer.loaded {
  opacity: 1;
  transition: opacity 0.3s ease-in-out;
}

.layer img {
  width: 1920px;
  height: 1080px;
  flex-shrink: 0;
  -webkit-user-select: none;
  user-select: none;
  pointer-events: none;
  display: block;
  margin: 0;
  padding: 0;
  border: none;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: optimize-contrast;
}

.layer img:last-child {
  margin-left: -1px;
}

/* Layer z-index and scroll speed */
.layer1 { z-index: 1; animation-name: scroll; animation-duration: 120s; }
.layer2 { z-index: 2; animation-name: scroll; animation-duration: 100s; }
.layer3 { z-index: 3; animation-name: scroll; animation-duration: 80s; }
.layer4 { z-index: 4; animation-name: scroll; animation-duration: 60s; }
.layer5 { z-index: 5; animation-name: scroll; animation-duration: 40s; }
.layer6 { z-index: 6; animation-name: scroll; animation-duration: 20s; }

@keyframes scroll {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(-1920px, 0, 0); }
}

/* Traveling GIF animations */
.traveling-gif {
  position: absolute;
  transform-origin: center center;
  pointer-events: none;
}

@keyframes moveLTR {
  from { transform: translateX(-200px); }
  to { transform: translateX(2120px); }
}

@keyframes moveLTRFlipped {
  from { transform: translateX(-200px) scaleX(-1); }
  to { transform: translateX(2120px) scaleX(-1); }
}

@keyframes moveRTL {
  from { transform: translateX(1920px); }
  to { transform: translateX(-200px); }
}

/* Info button */
.info-button {
  position: fixed;
  bottom: calc(15px + env(safe-area-inset-bottom, 0px));
  left: calc(15px + env(safe-area-inset-left, 0px));
  width: 50px;
  height: 50px;
  background: rgba(0,0,0,0.5);
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 9999;
  transition: all 0.3s ease;
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
  text-decoration: none;
}

.info-button::before {
  content: 'i';
  color: white;
  font-family: serif;
  font-size: 24px;
  font-weight: bold;
  font-style: italic;
}

.info-button:hover {
  background: rgba(0,0,0,0.7);
  border-color: rgba(255,255,255,0.5);
  transform: scale(1.1);
}

/* Mobile adjustments */
@media (max-width: 768px) {
  .info-button {
    width: 40px;
    height: 40px;
    bottom: calc(10px + env(safe-area-inset-bottom, 0px));
    left: calc(10px + env(safe-area-inset-left, 0px));
  }
  .info-button::before {
    font-size: 16px;
  }
}

/* Loading indicator */
.loading-indicator {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: rgba(255, 255, 255, 0.8);
  font-family: Arial, sans-serif;
  z-index: 100;
  font-size: 18px;
  text-align: center;
}

.loading-indicator.hidden {
  display: none;
}

.loading * {
  transition: none !important;
  animation: none !important;
}