:root {
  --card-width: 280px;
  --card-height: 400px;
  --card-spacing: 40px;
  --animation-duration: 20s;
  --glow-intensity: 0.5;
  --float-distance: 10px;
}

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

body {
  background: #000510;
  min-height: 100vh;
  overflow: hidden;
  cursor: none;
}

.container {
  position: relative;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  will-change: transform;
}

.cards-container {
  position: relative;
  display: flex;
  gap: var(--card-spacing);
  padding: 50px;
  will-change: transform;
}

.card {
  position: relative;
  width: var(--card-width);
  height: var(--card-height);
  background: rgba(0, 5, 15, 0.8);
  border-radius: 15px;
  overflow: hidden;
  transition: transform 0.3s ease;
  will-change: transform, opacity;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 15px;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.05), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card-image {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  transition: transform 0.3s ease;
  will-change: opacity;
}

@-webkit-keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(var(--float-distance));
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(var(--float-distance));
  }
}
@-webkit-keyframes autonomous-glow {
  0%, 100% {
    box-shadow: 0 0 25px rgba(0, 225, 255, 0);
    filter: brightness(0.1);
    opacity: 0.1;
  }
  50% {
    box-shadow: 0 0 25px var(--glow-color);
    filter: brightness(1.3);
    opacity: 1;
  }
}
@keyframes autonomous-glow {
  0%, 100% {
    box-shadow: 0 0 25px rgba(0, 225, 255, 0);
    filter: brightness(0.1);
    opacity: 0.1;
  }
  50% {
    box-shadow: 0 0 25px var(--glow-color);
    filter: brightness(1.3);
    opacity: 1;
  }
}
.card {
  -webkit-animation: float 3s ease-in-out infinite, autonomous-glow var(--glow-duration, 4s) ease-in-out infinite var(--glow-delay, 0s);
          animation: float 3s ease-in-out infinite, autonomous-glow var(--glow-duration, 4s) ease-in-out infinite var(--glow-delay, 0s);
}

.card-image {
  will-change: opacity;
}

.cursor-light {
  position: fixed;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%) translateZ(0);
  z-index: 1;
  mix-blend-mode: screen;
  will-change: transform;
}

@media (max-width: 768px) {
  :root {
    --card-width: 220px;
    --card-height: 320px;
    --card-spacing: 20px;
  }

  .cards-container {
    padding: 20px;
  }
}