如何使用HTML和CSS创建一个响应式商品详情布局

<div class="container">
  <div class="product-image">
    @@##@@
  </div>
  <div class="product-info">
    <h1>商品标题</h1>
    <p>商品描述</p><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记（深入）</a>”；</p>
    <div class="product-price">
      <span class="discounted-price">￥99</span>
      <span class="regular-price">￥129</span>
    </div>
    <button class="add-to-cart">添加到购物车</button>
  </div>
</div>

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.product-image {
  text-align: center;
}

.product-image img {
  width: 100%;
  max-width: 400px;
  height: auto;
}

.product-info {
  text-align: center;
}

.product-info h1 {
  font-size: 24px;
  color: #333;
}

.product-info p {
  font-size: 16px;
  color: #666;
  margin-bottom: 20px;
}

.product-price {
  font-size: 18px;
  color: #f00;
  margin-bottom: 20px;
}

.product-price .discounted-price {
  font-weight: bold;
  margin-right: 10px;
}

.product-price .regular-price {
  text-decoration: line-through;
  color: #999;
}

.add-to-cart {
  background-color: #f00;
  color: #fff;
  padding: 10px 20px;
  font-size: 16px;
  border: none;
  cursor: pointer;
}

@media screen and (max-width: 768px) {
  .container {
    padding: 10px;
  }
  
  .product-image img {
    max-width: 100%;
  }
  
  .product-info h1 {
    font-size: 20px;
  }
  
  .product-info p {
    font-size: 14px;
    margin-bottom: 10px;
  }
  
  .product-price {
    font-size: 16px;
    margin-bottom: 10px;
  }
  
  .add-to-cart {
    padding: 8px 16px;
    font-size: 14px;
  }
}