Title: Shopify Cart Drawer
Description: An AJAX-powered sliding cart drawer for Shopify stores that updates in real-time.
Code:
<!-- Cart Drawer HTML -->
<div id="cart-drawer" class="cart-drawer">
  <div class="cart-drawer__header">
    <h2>Your Cart</h2>
    <button class="cart-drawer__close" aria-label="Close cart">
      <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
        <path d="M18 6L6 18M6 6L18 18" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
      </svg>
    </button>
  </div>
  
  <div class="cart-drawer__content">
    <div class="cart-drawer__items">
      {%- if cart.item_count > 0 -%}
        <form action="{{ routes.cart_url }}" method="post" id="cart-drawer-form">
          {%- for item in cart.items -%}
            <div class="cart-drawer__item" data-item-key="{{ item.key }}">
              <div class="cart-drawer__item-image">
                <img src="{{ item.image | img_url: '120x' }}" alt="{{ item.title | escape }}">
              </div>
              <div class="cart-drawer__item-details">
                <a href="{{ item.url }}" class="cart-drawer__item-title">
                  {{ item.product.title }}
                </a>
                <div class="cart-drawer__item-variant">
                  {{ item.variant.title }}
                </div>
                <div class="cart-drawer__item-price">
                  {{ item.final_price | money }}
                </div>
                <div class="cart-drawer__item-quantity">
                  <button type="button" class="quantity-button" data-action="decrease">-</button>
                  <input type="number" name="updates[{{ item.key }}]" value="{{ item.quantity }}" min="0" aria-label="Quantity">
                  <button type="button" class="quantity-button" data-action="increase">+</button>
                </div>
                <button type="button" class="cart-drawer__item-remove" data-item-key="{{ item.key }}">
                  Remove
                </button>
              </div>
            </div>
          {%- endfor -%}
          
          <div class="cart-drawer__footer">
            <div class="cart-drawer__subtotal">
              <span>Subtotal</span>
              <span>{{ cart.total_price | money }}</span>
            </div>
            <div class="cart-drawer__taxes">
              {%- if cart.taxes_included -%}
                <small>Tax included. <a href="{{ shop.policies.shipping_policy.url }}">Shipping</a> calculated at checkout.</small>
              {%- else -%}
                <small>Tax and <a href="{{ shop.policies.shipping_policy.url }}">shipping</a> calculated at checkout.</small>
              {%- endif -%}
            </div>
            <button type="submit" name="checkout" class="cart-drawer__checkout-button">
              Checkout
            </button>
            <a href="{{ routes.cart_url }}" class="cart-drawer__view-cart">
              View Cart
            </a>
          </div>
        </form>
      {%- else -%}
        <div class="cart-drawer__empty">
          <p>Your cart is currently empty.</p>
          <a href="{{ routes.all_products_collection_url }}" class="cart-drawer__continue-shopping">
            Continue Shopping
          </a>
        </div>
      {%- endif -%}
    </div>
  </div>
</div>

<!-- Cart Drawer JavaScript -->
<script>
document.addEventListener('DOMContentLoaded', function() {
  const cartDrawer = document.getElementById('cart-drawer');
  const cartToggle = document.querySelectorAll('.cart-toggle');
  const cartClose = document.querySelector('.cart-drawer__close');
  const cartOverlay = document.getElementById('cart-overlay');
  
  // Open cart drawer
  cartToggle.forEach(function(toggle) {
    toggle.addEventListener('click', function(e) {
      e.preventDefault();
      openCartDrawer();
    });
  });
  
  // Close cart drawer
  if (cartClose) {
    cartClose.addEventListener('click', closeCartDrawer);
  }
  
  if (cartOverlay) {
    cartOverlay.addEventListener('click', closeCartDrawer);
  }
  
  // Close cart drawer when pressing ESC key
  document.addEventListener('keydown', function(e) {
    if (e.key === 'Escape') {
      closeCartDrawer();
    }
  });
  
  // Handle quantity buttons
  const quantityButtons = document.querySelectorAll('.quantity-button');
  quantityButtons.forEach(function(button) {
    button.addEventListener('click', function() {
      const input = this.parentNode.querySelector('input');
      const currentValue = parseInt(input.value);
      
      if (this.dataset.action === 'increase') {
        input.value = currentValue + 1;
      } else if (this.dataset.action === 'decrease' && currentValue > 1) {
        input.value = currentValue - 1;
      }
      
      updateCart(input.name.replace('updates[', '').replace(']', ''), input.value);
    });
  });
  
  // Handle remove buttons
  const removeButtons = document.querySelectorAll('.cart-drawer__item-remove');
  removeButtons.forEach(function(button) {
    button.addEventListener('click', function() {
      const itemKey = this.dataset.itemKey;
      updateCart(itemKey, 0);
    });
  });
  
  // Update cart via AJAX
  function updateCart(itemKey, quantity) {
    fetch('/cart/change.js', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({
        id: itemKey,
        quantity: quantity
      })
    })
    .then(response => response.json())
    .then(cart => {
      refreshCart();
    })
    .catch(error => {
      console.error('Error updating cart:', error);
    });
  }
  
  // Refresh cart contents
  function refreshCart() {
    fetch('/cart?view=drawer')
      .then(response => response.text())
      .then(html => {
        const parser = new DOMParser();
        const doc = parser.parseFromString(html, 'text/html');
        const newContent = doc.querySelector('.cart-drawer__content');
        
        if (newContent) {
          document.querySelector('.cart-drawer__content').innerHTML = newContent.innerHTML;
        }
        
        // Re-attach event listeners
        attachEventListeners();
      })
      .catch(error => {
        console.error('Error refreshing cart:', error);
      });
  }
  
  function openCartDrawer() {
    cartDrawer.classList.add('cart-drawer--open');
    document.body.classList.add('cart-drawer-open');
    if (cartOverlay) {
      cartOverlay.classList.add('cart-overlay--active');
    }
  }
  
  function closeCartDrawer() {
    cartDrawer.classList.remove('cart-drawer--open');
    document.body.classList.remove('cart-drawer-open');
    if (cartOverlay) {
      cartOverlay.classList.remove('cart-overlay--active');
    }
  }
  
  function attachEventListeners() {
    // Re-attach event listeners after cart refresh
    // Repeat the event listener attachment code for quantity buttons and remove buttons
  }
});
</script>

<!-- Cart Drawer CSS -->
<style>
.cart-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: 400px;
  max-width: 90vw;
  height: 100vh;
  background-color: #fff;
  box-shadow: -2px 0 10px rgba(0,0,0,0.1);
  z-index: 1000;
  transform: translateX(100%);
  transition: transform 0.3s ease-in-out;
  display: flex;
  flex-direction: column;
}

.cart-drawer--open {
  transform: translateX(0);
}

.cart-drawer__header {
  padding: 1rem;
  border-bottom: 1px solid #e5e5e5;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cart-drawer__close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.cart-drawer__content {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
}

.cart-drawer__item {
  display: flex;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #e5e5e5;
}

.cart-drawer__item-image {
  width: 80px;
  margin-right: 1rem;
}

.cart-drawer__item-details {
  flex: 1;
}

.cart-drawer__item-title {
  font-weight: 500;
  margin-bottom: 0.25rem;
  display: block;
  text-decoration: none;
  color: #333;
}

.cart-drawer__item-variant {
  font-size: 0.875rem;
  color: #666;
  margin-bottom: 0.5rem;
}

.cart-drawer__item-price {
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.cart-drawer__item-quantity {
  display: flex;
  align-items: center;
  margin-bottom: 0.5rem;
}

.cart-drawer__item-quantity input {
  width: 40px;
  text-align: center;
  margin: 0 0.5rem;
  border: 1px solid #e5e5e5;
  padding: 0.25rem;
}

.quantity-button {
  background: none;
  border: 1px solid #e5e5e5;
  width: 25px;
  height: 25px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.cart-drawer__item-remove {
  background: none;
  border: none;
  color: #666;
  text-decoration: underline;
  cursor: pointer;
  padding: 0;
  font-size: 0.875rem;
}

.cart-drawer__footer {
  margin-top: 2rem;
}

.cart-drawer__subtotal {
  display: flex;
  justify-content: space-between;
  font-weight: 500;
  margin-bottom: 1rem;
}

.cart-drawer__taxes {
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
  color: #666;
}

.cart-drawer__checkout-button {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: #000;
  color: #fff;
  border: none;
  cursor: pointer;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.cart-drawer__view-cart {
  display: block;
  text-align: center;
  color: #333;
  text-decoration: none;
}

.cart-drawer__empty {
  text-align: center;
  padding: 2rem 0;
}

.cart-drawer__continue-shopping {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background-color: #000;
  color: #fff;
  text-decoration: none;
}

.cart-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s;
}

.cart-overlay--active {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 480px) {
  .cart-drawer {
    width: 100%;
    max-width: 100%;
  }
}
</style>

<!-- Don't forget to add this overlay element to your theme.liquid -->
<div id="cart-overlay" class="cart-overlay"></div>

<!-- Add this button somewhere in your navigation -->
<button class="cart-toggle">
  Cart 
  <span class="cart-count">{{ cart.item_count }}</span>
</button>