中央→サイド配置に移動するロゴ

<div class="d03-11-08-stage">
          <header class="d03-11-08-header">
            <span class="d03-11-08-logo">CENTRO</span>
            <nav class="d03-11-08-nav">
              <a href="#" onclick="return false">サービス</a>
              <a href="#" onclick="return false">実績</a>
              <a href="#" onclick="return false">お問合せ</a>
            </nav>
          </header>
          <div class="d03-11-08-scroll">
            <div class="d03-11-08-body">
              <p>↓ スクロールでロゴが中央から左端へ移動します</p>
              <div class="d03-11-08-block"></div>
              <div class="d03-11-08-block"></div>
              <div class="d03-11-08-block"></div>
              <div class="d03-11-08-block"></div>
            </div>
          </div>
        </div>

.prev.d03-11-08{padding:0;display:block}
        .d03-11-08-stage{position:relative;width:100%;height:100%;min-height:260px;overflow:hidden;background:#f5f3ff}
        .d03-11-08-header{
          position:absolute;top:0;left:0;right:0;z-index:2;
          display:flex;align-items:center;justify-content:space-between;
          height:60px;padding:0 20px;background:#fff;
          box-shadow:0 2px 8px rgba(0,0,0,.08);
        }
        .d03-11-08-logo{
          position:absolute;left:50%;top:50%;
          transform:translate(-50%,-50%);
          font-weight:800;letter-spacing:.14em;color:#5b21b6;font-size:16px;
          transition:left .35s cubic-bezier(.4,0,.2,1),transform .35s cubic-bezier(.4,0,.2,1);
        }
        .d03-11-08-stage.moved .d03-11-08-logo{left:20px;transform:translate(0,-50%)}
        .d03-11-08-nav{display:flex;gap:16px;margin-left:auto;opacity:0;transform:translateX(8px);transition:opacity .3s ease,transform .3s ease}
        .d03-11-08-stage.moved .d03-11-08-nav{opacity:1;transform:translateX(0)}
        .d03-11-08-nav a{color:#334155;text-decoration:none;font-size:11.5px;font-weight:600}
        .d03-11-08-nav a:hover{color:#7c3aed}
        .d03-11-08-scroll{position:absolute;inset:0;overflow-y:auto;padding-top:60px}
        .d03-11-08-body{padding:16px}
        .d03-11-08-body p{font-size:11.5px;color:#6d28d9;margin:0 0 12px;text-align:center}
        .d03-11-08-block{
          height:80px;border-radius:8px;margin-bottom:12px;
          background:linear-gradient(135deg,#ede9fe,#c4b5fd);
        }

(function(){
        var stage=document.querySelector('.d03-11-08-stage');
        if(!stage)return;
        var scroller=stage.querySelector('.d03-11-08-scroll');
        scroller.addEventListener('scroll',function(){
          stage.classList.toggle('moved',scroller.scrollTop>30);
        });
      })();