*, *::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: #f8fafc;
  min-height: 100vh;
  padding: 40px;
}

.store-layout {
  max-width: 800px;
  margin: 0 auto;
}

.cart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #ffffff;
  padding: 20px 40px;
  border-radius: 20px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.05);
  margin-bottom: 60px;
}

.cart-header h2 {
  margin: 0;
  color: #0f172a;
}

.cart-icon {
  position: relative;
  background: #f1f5f9;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #0f172a;
  transition: transform 0.2s, background 0.2s;
}

.cart-icon.bounce {
  animation: cart-bounce 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  background: #dbeafe;
  color: #3b82f6;
}

@keyframes cart-bounce {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.cart-count {
  position: absolute;
  top: -5px;
  right: -5px;
  background: #ef4444;
  color: #ffffff;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: 700;
  font-size: 0.8rem;
  box-shadow: 0 2px 5px rgba(239, 68, 68, 0.4);
}

.product-shelf {
  display: flex;
  justify-content: center;
}

.product-item {
  background: #ffffff;
  padding: 30px;
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.08);
  text-align: center;
  width: 260px;
}

.draggable-img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  cursor: grab;
  margin-bottom: 20px;
  user-select: none;
  /* Prevent native browser drag to avoid bugs */
  -webkit-user-drag: none;
}

.draggable-img:active {
  cursor: grabbing;
}

.product-item h3 {
  margin: 0 0 10px 0;
  color: #0f172a;
}

.product-item p {
  color: #3b82f6;
  font-weight: 700;
  font-size: 1.25rem;
  margin: 0 0 20px 0;
}

.drag-hint {
  background: #f1f5f9;
  color: #64748b;
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-block;
}

/* The Ghost image safely generated by JS */
.ghost-item {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.8;
  border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
  transition: none; /* Instant tracking */
}

const sourceImg = document.getElementById("shoe-img");
const cartIcon = document.getElementById("cart-icon");
const cartCount = document.getElementById("cart-count");

let isDragging = false;
let ghost = null;
let currentCount = 0;

function startDrag(e) {
  isDragging = true;
  sourceImg.style.opacity = "0.3";
  
  /* Create exact visual clone flawlessly */
  ghost = document.createElement("img");
  ghost.src = sourceImg.src;
  ghost.className = "ghost-item";
  
  const rect = sourceImg.getBoundingClientRect();
  ghost.style.width = rect.width + "px";
  ghost.style.height = rect.height + "px";
  
  document.body.appendChild(ghost);
  moveGhost(e);
}

function moveGhost(e) {
  if (!ghost) return;
  const rect = ghost.getBoundingClientRect();
  const x = e.clientX - (rect.width / 2);
  const y = e.clientY - (rect.height / 2);
  ghost.style.left = x + "px";
  ghost.style.top = y + "px";
}

function endDrag(e) {
  if (!isDragging) return;
  isDragging = false;
  sourceImg.style.opacity = "1";
  
  if (ghost) {
    const cartRect = cartIcon.getBoundingClientRect();
    const dropX = e.clientX;
    const dropY = e.clientY;
    
    /* Check collision boundaries cleanly */
    if (dropX > cartRect.left && dropX < cartRect.right && dropY > cartRect.top && dropY < cartRect.bottom) {
      /* Trajectory animation directly into cart */
      ghost.style.transition = "all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1)";
      ghost.style.left = (cartRect.left + 15) + "px";
      ghost.style.top = (cartRect.top + 15) + "px";
      ghost.style.width = "30px";
      ghost.style.height = "30px";
      ghost.style.opacity = "0";
      
      currentCount++;
      
      setTimeout(function() {
        cartCount.innerText = currentCount;
        cartIcon.classList.add("bounce");
        ghost.remove();
        ghost = null;
        
        setTimeout(function() {
          cartIcon.classList.remove("bounce");
        }, 400);
      }, 400);
    } else {
      /* Drop failed, remove ghost safely */
      ghost.remove();
      ghost = null;
    }
  }
}

sourceImg.addEventListener("pointerdown", startDrag);
window.addEventListener("pointermove", function(e) {
  if (isDragging) moveGhost(e);
});
window.addEventListener("pointerup", endDrag);
window.addEventListener("pointercancel", endDrag);