OTel Arrow pipeline

<div class="demo"><div class="title">ROWS → COLUMNS</div><div class="scene"><div class="rows"><div>svc=A · 12ms</div><div>svc=A · 20ms</div><div>svc=A · 16ms</div></div><div class="arr">→</div><div class="cols"><div>svc: A × 3</div><div>ms: 12,20,16</div></div></div></div>

.demo{width:min(94vw,690px);height:min(88vh,320px);box-sizing:border-box;padding:clamp(9px,2.5vmin,18px);border:1px solid var(--line);border-radius:14px;background:var(--surface);color:var(--fg);font:600 clamp(12px,2.4vmin,16px)/1.25 var(--font-sans,"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,sans-serif);display:flex;flex-direction:column;gap:clamp(7px,2vmin,14px);overflow:hidden}.title{color:var(--accent);font:700 clamp(12px,2.4vmin,16px)/1.2 var(--font-sans,"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,sans-serif);letter-spacing:.04em}.scene{flex:1;min-height:0;position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden}.scene{gap:6px}.rows,.cols{width:42%;display:grid;gap:6px;font:600 clamp(12px,2.4vmin,15px)/1 ui-monospace,monospace}.rows div,.cols div{border:1px solid var(--line);border-radius:5px;padding:7px 3px;text-align:center;white-space:nowrap;overflow:hidden}.rows div{animation:row 2.6s infinite}.rows div:nth-child(2){animation-delay:.2s}.rows div:nth-child(3){animation-delay:.4s}.cols div{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 16%,var(--surface));animation:col 2.6s infinite}.arr{color:var(--accent);font-size:24px}@keyframes row{0%,15%,100%{border-color:var(--accent-2);background:color-mix(in srgb,var(--accent-2) 12%,var(--surface))}55%,85%{border-color:var(--line);background:var(--bg)}}@keyframes col{0%,30%,100%{border-color:var(--line);background:var(--bg)}55%,85%{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 16%,var(--surface))}}