方向連動で一時停止するローディングアニメ

<div class="d08-13-04-stage">
          <div class="d08-13-04-loaderwrap">
            <span class="d08-13-04-loader"></span>
            <span class="d08-13-04-status">再生中</span>
          </div>
          <div class="d08-13-04-scroll">
            <div class="d08-13-04-body">
              <p>↓ 下スクロールで一時停止 / ↑ 上スクロールで再生再開</p>
              <div class="d08-13-04-block"></div>
              <div class="d08-13-04-block"></div>
              <div class="d08-13-04-block"></div>
            </div>
          </div>
        </div>

.prev.d08-13-04{padding:0;display:block}
        .d08-13-04-stage{position:relative;width:100%;height:100%;min-height:260px;overflow:hidden;background:#fff7ed}
        .d08-13-04-loaderwrap{
          position:absolute;top:14px;left:50%;transform:translateX(-50%);z-index:3;
          display:flex;flex-direction:column;align-items:center;gap:6px;
        }
        .d08-13-04-loader{
          width:44px;height:44px;border-radius:50%;
          border:5px solid #fed7aa;border-top-color:#ea580c;
          animation:d08-13-04-spin 1s linear infinite;
        }
        @keyframes d08-13-04-spin{to{transform:rotate(360deg)}}
        .d08-13-04-stage.is-down .d08-13-04-loader{animation-play-state:paused}
        .d08-13-04-status{font-size:11px;font-weight:700;color:#c2410c}
        .d08-13-04-scroll{position:absolute;inset:0;overflow-y:auto;padding-top:88px}
        .d08-13-04-body{padding:16px}
        .d08-13-04-body p{font-size:11.5px;color:#c2410c;margin:0 0 12px;text-align:center}
        .d08-13-04-block{height:80px;border-radius:8px;margin-bottom:12px;background:linear-gradient(135deg,#ffedd5,#fdba74)}

(function(){
        var stage=document.querySelector('.d08-13-04-stage');
        if(!stage)return;
        var scroller=stage.querySelector('.d08-13-04-scroll');
        var status=stage.querySelector('.d08-13-04-status');
        var last=0;
        scroller.addEventListener('scroll',function(){
          var top=scroller.scrollTop;
          if(top>last+2){stage.classList.add('is-down');status.textContent='一時停止中';}
          else if(top<last-2){stage.classList.remove('is-down');status.textContent='再生中';}
          last=top<=0?0:top;
        });
      })();