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

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  margin: 0;
  background: #e2e8f0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.checkout-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
}

.card-perspective {
  perspective: 1000px;
  width: 400px;
  height: 250px;
}

.credit-card {
  position: relative;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  border-radius: 20px;
  box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.4), inset 0 1px 1px rgba(255, 255, 255, 0.2);
  transform-style: preserve-3d;
  will-change: transform;
  overflow: hidden;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.hologram-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(115deg, transparent 20%, rgba(255,255,255,0.3) 30%, transparent 40%);
  background-size: 300% 300%;
  background-position: 50% 50%;
  z-index: 2;
  mix-blend-mode: overlay;
  pointer-events: none;
}

.card-inner {
  position: relative;
  z-index: 3;
  padding: 30px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: #ffffff;
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  transform: translateZ(30px);
}

.card-number {
  font-size: 1.43rem;
  font-family: "Courier New", Courier, monospace;
  letter-spacing: 4px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.5);
  transform: translateZ(40px);
}

.card-bottom {
  display: flex;
  justify-content: space-between;
  transform: translateZ(20px);
}

.label {
  display: block;
  font-size: 0.65rem;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.value {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.helper-text {
  color: #64748b;
  font-weight: 500;
}

const card = document.getElementById("credit-card");
const hologram = document.getElementById("hologram");

card.addEventListener("mousemove", function(e) {
  const rect = card.getBoundingClientRect();
  const x = e.clientX - rect.left;
  const y = e.clientY - rect.top;
  
  const centerX = rect.width / 2;
  const centerY = rect.height / 2;
  
  /* Calculate rotation based on cursor distance from center */
  const rotateX = ((y - centerY) / centerY) * -15;
  const rotateY = ((x - centerX) / centerX) * 15;
  
  card.style.transform = "rotateX(" + rotateX + "deg) rotateY(" + rotateY + "deg)";
  
  /* Shift the gradient background for the holographic effect */
  const bgX = (x / rect.width) * 100;
  const bgY = (y / rect.height) * 100;
  hologram.style.backgroundPosition = bgX + "% " + bgY + "%";
});

card.addEventListener("mouseleave", function() {
  /* Snap back securely with a smooth transition */
  card.style.transition = "transform 0.5s ease";
  card.style.transform = "rotateX(0deg) rotateY(0deg)";
  hologram.style.transition = "background-position 0.5s ease";
  hologram.style.backgroundPosition = "50% 50%";
});

card.addEventListener("mouseenter", function() {
  /* Remove transition to allow instant mouse tracking */
  card.style.transition = "none";
  hologram.style.transition = "none";
});