ハンバーガー→×アイコン変形メニュー

<div class="d03-08-01-frame">
          <div class="d03-08-01-bar">
            <span class="d03-08-01-logo">Shop</span>
            <button class="d03-08-01-burger" type="button" aria-label="メニューを開く" aria-expanded="false">
              <span></span><span></span><span></span>
            </button>
          </div>
          <nav class="d03-08-01-menu">
            <a href="#">ホーム</a>
            <a href="#">商品一覧</a>
            <a href="#">会社概要</a>
            <a href="#">お問い合わせ</a>
          </nav>
        </div>

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        .d03-08-01-bar{position:relative;z-index:4;display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid #eef2f7;background:#fff}
        .d03-08-01-logo{font-weight:800;font-size:13px;color:#4f46e5;letter-spacing:.02em}
        .d03-08-01-burger{position:relative;width:28px;height:28px;border:0;background:transparent;cursor:pointer;padding:0}
        .d03-08-01-burger span{position:absolute;left:4px;width:20px;height:2.4px;background:#1f2937;border-radius:2px;transition:transform .3s,opacity .3s,top .3s}
        .d03-08-01-burger span:nth-child(1){top:8px}
        .d03-08-01-burger span:nth-child(2){top:14px}
        .d03-08-01-burger span:nth-child(3){top:20px}
        .d03-08-01-burger.open span:nth-child(1){top:14px;transform:rotate(45deg)}
        .d03-08-01-burger.open span:nth-child(2){opacity:0}
        .d03-08-01-burger.open span:nth-child(3){top:14px;transform:rotate(-45deg)}
        .d03-08-01-menu{position:absolute;left:0;right:0;top:57px;bottom:0;display:flex;flex-direction:column;gap:2px;padding:10px 16px;background:#fff;opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .25s,transform .25s,visibility .25s;z-index:2}
        .d03-08-01-frame.open .d03-08-01-menu{opacity:1;visibility:visible;transform:translateY(0)}
        .d03-08-01-menu a{padding:10px 8px;color:#374151;text-decoration:none;font-size:13.5px;border-radius:8px;transition:background .15s,color .15s}
        .d03-08-01-menu a:hover{background:#eef2ff;color:#4338ca}

(function(){
        var root=document.getElementById('item-03-08-01');
        var burger=root.querySelector('.d03-08-01-burger');
        var frame=root.querySelector('.d03-08-01-frame');
        burger.addEventListener('click',function(){
          var isOpen=frame.classList.toggle('open');
          burger.classList.toggle('open',isOpen);
          burger.setAttribute('aria-expanded',isOpen?'true':'false');
        });
      })();