:root{color-scheme:light;--bg:#ededed;--fg:#2b2d31;--muted:#666a70;--card:#fff;--line:#cfd1d4;--accent:#36393f;--head:#e3e4e6;--err:#9b1c1c;--ok:#2f6b3f}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:15px/1.5 system-ui,Segoe UI,sans-serif}main{max-width:960px;margin:0 auto;padding:16px}h1{margin:8px 0 0;font-size:1.5rem}.sub{color:var(--muted);margin:0 0 16px}nav{display:flex;gap:4px;flex-wrap:wrap;border-bottom:1px solid var(--line);margin-bottom:16px}nav button{background:none;border:0;padding:8px 14px;cursor:pointer;color:var(--muted);font:inherit;border-bottom:2px solid transparent}nav button[aria-selected=true]{color:var(--accent);border-color:var(--accent);font-weight:600}.card{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:16px;margin-bottom:16px}label{display:block;font-size:.85rem;color:var(--muted);margin-bottom:4px}input,select{font:inherit;padding:6px 8px;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--fg);max-width:100%}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:1px}textarea{font:14px/1.4 ui-monospace,Consolas,monospace;width:100%;padding:8px;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--fg)}.row{display:flex;gap:12px;flex-wrap:wrap;align-items:end;margin-bottom:8px}button.btn{font:inherit;padding:6px 14px;border:1px solid var(--accent);background:var(--accent);color:#fff;border-radius:6px;cursor:pointer}button.ghost{background:none;color:var(--accent)}table{border-collapse:collapse;width:100%;font-size:.9rem}td,th{text-align:left;padding:6px 8px;border-bottom:1px solid var(--line)}.mono,td{font-family:ui-monospace,Consolas,monospace}.wrap{overflow-x:auto}.err{color:var(--err);margin:8px 0}.ok{color:var(--ok)}dl{display:grid;grid-template-columns:max-content 1fr;grid-gap:4px 16px;gap:4px 16px;margin:0}dt{color:var(--muted)}dd{margin:0;font-family:ui-monospace,Consolas,monospace;word-break:break-all}details.help{background:var(--bg);border:1px solid var(--line);border-radius:6px;padding:8px 12px;margin:0 0 12px}details.help summary{cursor:pointer;font-weight:600;color:var(--accent)}details.help p{margin:8px 0}details.explain{margin:16px 0 0}details.explain ol{padding-left:20px}details.explain li{margin-bottom:8px}details.explain pre{margin:4px 0;padding:8px;background:var(--card);border:1px solid var(--line);border-radius:6px;overflow-x:auto;font:13px/1.5 ui-monospace,Consolas,monospace}th{background:var(--head)}header.top{background:var(--accent);color:#fff;margin:-16px -16px 16px;padding:14px 16px}header.top h1{margin:0;color:#fff}header.top .sub{color:#c9cbcf;margin:0}table.guide td,table.guide th{text-align:center;white-space:nowrap}table.guide td:first-child,table.guide th:first-child{text-align:left;font-family:system-ui,Segoe UI,sans-serif;font-weight:600;background:var(--head)}table.guide caption{text-align:left;font-weight:600;padding-bottom:6px}table.guide .note{color:var(--muted);font-size:.8rem;margin:6px 0 0}.warn{background:#f4efe0;border:1px solid #d8cfa8;color:#5b4a12;border-radius:6px;padding:8px 12px 8px 28px;margin:8px 0}.verdict{font-weight:600;font-size:1.05rem;margin:8px 0}.printonly{display:none;font-weight:600}.exportbar{margin:8px 0 0;align-items:center}details.ranges summary{cursor:pointer}details.ranges table td:nth-child(2),details.ranges table td:nth-child(4){font-family:inherit}.usebar{display:flex;height:18px;background:var(--head);border:1px solid var(--line);border-radius:4px;overflow:hidden}.usebar .seg{height:100%;border-right:2px solid var(--card)}.s0{background:#36393f}.s1{background:#6b6f77}.s2{background:#9a9ea6}.s3{background:#55585f}.bits{display:flex;flex-wrap:wrap;gap:2px}.bit{width:26px;height:32px;padding:0;font:600 14px ui-monospace,Consolas,monospace;border:1px solid var(--line);border-radius:4px;cursor:pointer}.bit.net{background:var(--accent);color:#fff;border-color:var(--accent)}.bit.host{background:#fff;color:var(--fg)}.bit.gap{margin-left:8px}.bitviz{margin-top:12px}input[type=range]{padding:0}button:disabled{opacity:.5;cursor:not-allowed}[hidden]{display:none!important}@media (max-width:640px){main{padding:12px}header.top{margin:-12px -12px 12px}nav{flex-wrap:nowrap;overflow-x:auto}nav button{white-space:nowrap}dl{grid-template-columns:1fr;gap:0}dt{margin-top:8px}.row input:not([type=number]):not([type=range]),.row>div{width:100%}.bit{width:20px;height:28px;font-size:12px}.bit.gap{margin-left:4px}table.guide td:first-child,table.guide th:first-child{position:-webkit-sticky;position:sticky;left:0}table.guide{font-size:.8rem}}@media print{.noprint{display:none!important}.printonly{display:block}body{background:#fff}.card{border:0;padding:0}main{max-width:none}}