:root{--ink:#173e38;--green:#0c6657;--cream:#f5f4ea}*{box-sizing:border-box}body{margin:0;background:var(--cream);color:var(--ink);font-family:system-ui,sans-serif;line-height:1.6}.container-fluid{max-width:1360px}header{max-width:950px}.eyebrow{font-size:12px;font-weight:800;letter-spacing:.12em;color:#487262}h1{font-size:clamp(28px,4vw,43px);font-weight:800}h2{font-size:23px;font-weight:750}h3{font-size:17px;font-weight:700}.lead{font-size:18px}.mechanism{background:#e2eddb;border-left:4px solid #7b9b4b;padding:14px 18px;border-radius:6px}.card-panel{padding:22px;border:1px solid #d2ddcb;background:#fffef8;border-radius:17px}.btn,.form-select{min-height:44px}.btn{white-space:normal}.btn-success{background:var(--green);border-color:var(--green)}.route{display:flex;align-items:center;gap:12px}.route-node{flex:1;min-width:0;border:1px solid #aac6b9;border-radius:12px;padding:18px 14px;background:#eef5e6;font-weight:750;overflow-wrap:anywhere;text-align:center}.route-node span{display:block;font-weight:450;font-size:13px;margin-top:6px}.proxy{background:#124c42;color:#fff7da}.arrow{font-size:25px;color:#668440}.step-select{width:auto;max-width:100%;flex:1;min-width:120px}pre{background:#113d35;color:#edf4d8;border-radius:10px;padding:16px;margin:12px 0;max-height:420px;overflow:auto;font:13px/1.65 Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere}.result-status{font-size:23px;font-weight:750;color:#175946}.result-status.bad{color:#a54220}.hash{font-size:12px;overflow-wrap:anywhere;margin-top:10px}summary{padding:12px 0;font-weight:700;cursor:pointer}button:focus-visible,select:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #ad7411;outline-offset:3px}@media(max-width:600px){.card-panel{padding:15px}.route{display:grid;grid-template-columns:1fr;gap:6px}.arrow{transform:rotate(90deg);text-align:center;line-height:22px}.route-node{padding:12px}.lead{font-size:16px}.d-flex>.btn{flex-grow:1}h2{font-size:21px}pre{font-size:12px;padding:12px}.btn{font-size:14px}}

.answer-controls{display:grid;grid-template-columns:44px minmax(0,1fr) 44px;gap:8px;max-width:620px}.answer-controls .step-select{width:100%;min-width:0}.answer-controls .btn{padding:8px}