:root{font-family:system-ui,sans-serif;line-height:1.5;color:#111;background:#fafafa}body{margin:0}main{max-width:960px;margin:0 auto;padding:1.5rem}h1{font-size:1.5rem}.panel{background:#fff;border:1px solid #e0e0e0;border-radius:8px;padding:1rem;margin-top:1rem}table{width:100%;border-collapse:collapse;font-size:.875rem}th,td{text-align:left;padding:.4rem .5rem;border-bottom:1px solid #eee}button{cursor:pointer;padding:.5rem 1rem;border-radius:6px;border:1px solid #0b57d0;background:#0b57d0;color:#fff;font-weight:600}button.secondary{background:#fff;color:#0b57d0}.error{color:#b3261e;font-size:.875rem}