:root{
    --ink:#0E1420;--ink-2:#141C2B;--surface:#182234;--surface-2:#1E2A40;
    --line:#2A3852;--text:#EAF0FA;--muted:#8794AC;--muted-2:#5D6B85;
    --signal:#F5B942;--signal-dim:#B8892B;--good:#54D6A0;--bad:#FF7A7A;--radius:14px;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
  body{
    font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
    background:
      radial-gradient(1200px 600px at 80% -10%, rgba(245,185,66,.08), transparent 60%),
      radial-gradient(900px 500px at -10% 20%, rgba(84,214,160,.05), transparent 55%),
      var(--ink);
    color:var(--text);line-height:1.55;min-height:100vh;-webkit-font-smoothing:antialiased;
  }
  .mono{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Cascadia Mono","Liberation Mono","Courier New",monospace}
  .wrap{max-width:960px;margin:0 auto;padding:0 20px}

  header{padding:24px 0 8px;display:flex;align-items:center;justify-content:space-between;gap:14px}
  .brand{display:flex;align-items:center;gap:11px}
  .logo{width:34px;height:34px;border-radius:9px;flex:none;background:linear-gradient(145deg,var(--signal),var(--signal-dim));display:grid;place-items:center;box-shadow:0 0 0 1px rgba(245,185,66,.25),0 8px 24px -8px rgba(245,185,66,.4)}
  .logo svg{width:19px;height:19px;display:block}
  .brand h1{font-size:20px;font-weight:700;letter-spacing:-.02em}
  .brand h1 span{color:var(--signal)}
  .brand .tag{color:var(--muted);font-size:12.5px;margin-top:1px}

  /* Tabs */

  .lead{color:var(--muted);font-size:14.5px;margin:18px 0 0;max-width:72ch}

  /* Hero */
  .hero{margin-top:18px;background:linear-gradient(180deg,var(--surface),var(--ink-2));border:1px solid var(--line);border-radius:var(--radius);padding:26px 26px 24px;position:relative;overflow:hidden}
  .hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(42,56,82,.35) 1px,transparent 1px),linear-gradient(90deg,rgba(42,56,82,.35) 1px,transparent 1px);background-size:38px 38px;-webkit-mask-image:radial-gradient(400px 200px at 85% 0%,#000,transparent 70%);mask-image:radial-gradient(400px 200px at 85% 0%,#000,transparent 70%);pointer-events:none}
  .hero-label{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;font-weight:600;position:relative}
  .dot{width:7px;height:7px;border-radius:50%;background:var(--good);box-shadow:0 0 0 3px rgba(84,214,160,.18);animation:pulse 2.4s ease-in-out infinite}
  @keyframes pulse{50%{box-shadow:0 0 0 6px rgba(84,214,160,0)}}
  .myip{font-size:clamp(32px,7vw,54px);font-weight:700;letter-spacing:-.01em;margin-top:12px;line-height:1.05;word-break:break-all;position:relative;display:flex;align-items:baseline;flex-wrap:wrap;gap:2px}
  .myip .sep{color:var(--signal);padding:0 2px}
  .myip .ph{color:var(--muted-2)}
  .myip-sub{color:var(--muted);font-size:14px;margin-top:12px;position:relative;min-height:21px}
  .myip-sub b{color:var(--text);font-weight:500}
  .copy{margin-top:16px;position:relative;background:var(--surface-2);border:1px solid var(--line);color:var(--text);font-family:inherit;font-size:12.5px;font-weight:500;padding:7px 13px;border-radius:8px;cursor:pointer;display:inline-flex;gap:7px;align-items:center;transition:border-color .15s,background .15s}
  .copy:hover{border-color:var(--signal-dim);background:#22304a}
  .copy svg{width:14px;height:14px}

  .search{margin-top:20px;display:flex;gap:10px}
  .field{flex:1;position:relative}
  .field input{width:100%;background:var(--surface);border:1px solid var(--line);border-radius:11px;color:var(--text);font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Cascadia Mono","Liberation Mono","Courier New",monospace;font-size:15px;padding:15px 16px;outline:none;transition:border-color .15s,box-shadow .15s}
  .field input::placeholder{color:var(--muted-2)}
  .field input:focus{border-color:var(--signal);box-shadow:0 0 0 3px rgba(245,185,66,.12)}
  .btn{background:linear-gradient(145deg,var(--signal),var(--signal-dim));color:#1a1206;border:none;border-radius:11px;font-family:inherit;font-weight:600;font-size:15px;padding:0 22px;cursor:pointer;white-space:nowrap;transition:filter .15s,transform .05s}
  .btn:hover{filter:brightness(1.06)}
  .btn:active{transform:translateY(1px)}
  .btn:disabled{opacity:.55;cursor:default}
  .btn.lg{padding:14px 26px}

  .results{margin:22px 0 8px;opacity:0;transform:translateY(6px);transition:opacity .3s,transform .3s}
  .results.show{opacity:1;transform:none}
  .res-head{display:flex;align-items:baseline;gap:12px;margin-bottom:14px;flex-wrap:wrap}
  .res-head .ip{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Cascadia Mono","Liberation Mono","Courier New",monospace;font-size:22px;font-weight:700}
  .res-head .flag{font-size:22px;line-height:1}
  .res-head .type{font-size:11px;letter-spacing:.08em;color:var(--signal);border:1px solid var(--signal-dim);padding:3px 8px;border-radius:6px;font-weight:600;text-transform:uppercase}
  .grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
  .cell{background:var(--surface);border:1px solid var(--line);border-radius:11px;padding:14px 16px;min-width:0}
  .cell .k{color:var(--muted);font-size:11px;letter-spacing:.09em;text-transform:uppercase;font-weight:600}
  .cell .v{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Cascadia Mono","Liberation Mono","Courier New",monospace;font-size:15px;margin-top:6px;color:var(--text);word-break:break-word}
  .cell.wide{grid-column:1/-1}
  .map{grid-column:1/-1;border:1px solid var(--line);border-radius:11px;overflow:hidden;background:var(--surface);height:220px}
  .map iframe{width:100%;height:100%;border:0;display:block;filter:grayscale(.25) contrast(.95)}
  .msg{margin:20px 0;padding:14px 16px;border-radius:11px;font-size:14px;display:none;align-items:center;gap:10px}
  .msg.err{display:flex;background:rgba(255,122,122,.08);border:1px solid rgba(255,122,122,.3);color:#ffb3b3}
  .skeleton .cell .v{color:transparent;background:linear-gradient(90deg,#22304a,#2c3c58,#22304a);background-size:200% 100%;border-radius:5px;animation:shine 1.3s linear infinite;height:18px;width:70%}
  @keyframes shine{to{background-position:-200% 0}}

  /* Assessment */
  .assess{background:var(--surface);border:1px solid var(--line);border-radius:11px;padding:16px 18px;margin-bottom:12px}
  .assess .k{color:var(--muted);font-size:11px;letter-spacing:.09em;text-transform:uppercase;font-weight:600}
  .purity{display:flex;align-items:center;gap:14px;margin-top:13px;flex-wrap:wrap}
  .score{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Cascadia Mono","Liberation Mono","Courier New",monospace;font-size:24px;font-weight:700;flex:none;line-height:1}
  .track{flex:1;min-width:170px;height:9px;border-radius:99px;position:relative;background:linear-gradient(90deg,#54D6A0 0%,#9BD46A 24%,#F5B942 52%,#FF9A55 76%,#FF7A7A 100%);opacity:.9}
  .knob{position:absolute;top:50%;width:15px;height:15px;border-radius:50%;background:var(--text);border:3px solid var(--ink);transform:translate(-50%,-50%);box-shadow:0 2px 8px rgba(0,0,0,.55)}
  .verdict{font-size:12px;font-weight:600;padding:4px 11px;border-radius:7px;flex:none;letter-spacing:.02em}
  .v-good{background:rgba(84,214,160,.14);color:var(--good);border:1px solid rgba(84,214,160,.35)}
  .v-mid{background:rgba(245,185,66,.13);color:var(--signal);border:1px solid rgba(245,185,66,.35)}
  .v-bad{background:rgba(255,122,122,.12);color:var(--bad);border:1px solid rgba(255,122,122,.32)}
  .hint{color:var(--muted-2);font-size:12px;margin-top:11px;line-height:1.5}
  .sep-line{height:1px;background:var(--line);margin:16px 0 0}
  .scen{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:13px}
  .sc{background:var(--surface-2);border:1px solid var(--line);border-radius:10px;padding:12px 8px;text-align:center}
  .sc .n{font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .sc .stars{color:var(--signal);font-size:12px;letter-spacing:1.5px;margin:8px 0 7px}
  .sc .stars i{font-style:normal;color:#3B4A66}
  .sc .vb{font-size:11px;font-weight:600;padding:3px 8px;border-radius:6px;display:inline-block}

  /* Env check */
  .bigscore{background:linear-gradient(180deg,var(--surface),var(--ink-2));border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;margin-top:18px;display:flex;align-items:center;gap:22px;flex-wrap:wrap}
  .ring{width:96px;height:96px;flex:none;position:relative}
  .ring svg{transform:rotate(-90deg);display:block}
  .ring .num{position:absolute;inset:0;display:grid;place-items:center;font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Cascadia Mono","Liberation Mono","Courier New",monospace;font-size:26px;font-weight:700}
  .bigscore .meta{flex:1;min-width:200px}
  .bigscore .meta .t{font-size:18px;font-weight:700}
  .bigscore .meta .d{color:var(--muted);font-size:13.5px;margin-top:6px;line-height:1.5}
  .chips{display:flex;gap:8px;margin-top:11px;flex-wrap:wrap}
  .chip{font-size:11.5px;font-weight:600;padding:4px 10px;border-radius:7px}

  .checks{margin-top:16px;display:flex;flex-direction:column;gap:8px}
  .chk{background:var(--surface);border:1px solid var(--line);border-radius:11px;padding:13px 16px;display:flex;align-items:flex-start;gap:12px}
  .chk .ico{width:20px;height:20px;border-radius:50%;flex:none;display:grid;place-items:center;margin-top:1px}
  .chk .ico svg{width:12px;height:12px}
  .i-ok{background:rgba(84,214,160,.15);color:var(--good)}
  .i-warn{background:rgba(245,185,66,.15);color:var(--signal)}
  .i-bad{background:rgba(255,122,122,.14);color:var(--bad)}
  .chk .body{flex:1;min-width:0}
  .chk .name{font-size:14px;font-weight:600}
  .chk .val{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Cascadia Mono","Liberation Mono","Courier New",monospace;font-size:13px;color:var(--muted);margin-top:3px;word-break:break-word}
  .chk .note{font-size:12.5px;color:var(--muted-2);margin-top:5px;line-height:1.5}

  /* Ping */
  .prow{background:var(--surface);border:1px solid var(--line);border-radius:11px;padding:12px 16px;display:flex;align-items:center;gap:14px;margin-bottom:8px}
  .prow .pn{font-size:14px;font-weight:600;width:98px;flex:none;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .pbar{flex:1;height:8px;background:var(--surface-2);border-radius:99px;overflow:hidden;min-width:60px}
  .pfill{height:100%;border-radius:99px;width:0;transition:width .45s ease}
  .pms{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Cascadia Mono","Liberation Mono","Courier New",monospace;font-size:14px;font-weight:700;width:82px;text-align:right;flex:none}
  .pjit{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Cascadia Mono","Liberation Mono","Courier New",monospace;font-size:11.5px;color:var(--muted-2);width:74px;text-align:right;flex:none}
  .psum{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0}
  .psum .cell{text-align:center}
  .psum .cell .v{font-size:20px}

  /* Content / SEO */
  main section.content{margin-top:52px}
  .eyebrow{color:var(--signal);font-size:12px;letter-spacing:.16em;text-transform:uppercase;font-weight:600}
  h2{font-size:clamp(22px,3.4vw,28px);font-weight:700;letter-spacing:-.02em;margin-top:10px}
  .content p{color:var(--muted);font-size:15px;margin-top:14px;max-width:70ch}
  .content p b{color:var(--text);font-weight:500}
  .reveal{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}
  .pnl{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 20px}
  .pnl .head{display:flex;align-items:center;gap:9px;margin-bottom:10px}
  .pnl .head svg{width:17px;height:17px;flex:none}
  .pnl.can .head{color:var(--good)}
  .pnl.cant .head{color:var(--bad)}
  .pnl .head span{font-size:13px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--text)}
  .pnl ul{list-style:none}
  .pnl li{color:var(--muted);font-size:14px;padding:5px 0 5px 20px;position:relative}
  .pnl li::before{content:"";position:absolute;left:2px;top:12px;width:6px;height:6px;border-radius:50%}
  .pnl.can li::before{background:var(--good)}
  .pnl.cant li::before{background:var(--bad)}
  .faq{margin-top:22px;display:flex;flex-direction:column;gap:10px}
  details{background:var(--surface);border:1px solid var(--line);border-radius:12px;overflow:hidden}
  summary{list-style:none;cursor:pointer;padding:16px 18px;font-size:15.5px;font-weight:600;display:flex;justify-content:space-between;align-items:center;gap:12px}
  summary::-webkit-details-marker{display:none}
  summary::after{content:"+";color:var(--signal);font-size:20px;font-weight:400;transition:transform .2s;flex:none}
  details[open] summary::after{transform:rotate(45deg)}
  details .a{padding:0 18px 16px;color:var(--muted);font-size:14.5px;max-width:72ch}

  footer{margin-top:52px;border-top:1px solid var(--line);padding:22px 0 40px;color:var(--muted-2);font-size:12.5px;text-align:center}
  footer a{color:var(--muted);text-decoration:none}
  footer a:hover{color:var(--text)}
  .footlinks{margin-bottom:10px;display:flex;gap:18px;justify-content:center;flex-wrap:wrap}

  @media (max-width:600px){
    .search{flex-direction:column}.btn{padding:14px}
    .grid,.reveal{grid-template-columns:1fr}
    .scen{grid-template-columns:repeat(2,1fr)}
    .prow .pn{width:76px;font-size:13px}
    .pjit{display:none}
    .pms{width:70px;font-size:13px}
  }
  @media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
  :focus-visible{outline:2px solid var(--signal);outline-offset:2px}

  .brandname{font-size:20px;font-weight:700;letter-spacing:-.02em;line-height:1.2}
  .brandname a{color:var(--text);text-decoration:none}
  .brandname span{color:var(--signal)}

  /* 站内导航 */
  .sitenav{display:flex;gap:4px;margin-top:16px;border-bottom:1px solid var(--line);
    overflow-x:auto;-webkit-overflow-scrolling:touch}
  .sitenav a{display:flex;align-items:center;gap:8px;padding:11px 15px;white-space:nowrap;
    color:var(--muted);font-size:14.5px;font-weight:600;text-decoration:none;
    border-bottom:2px solid transparent;transition:color .15s,border-color .15s}
  .sitenav a svg{width:16px;height:16px;flex:none}
  .sitenav a:hover{color:var(--text)}
  .sitenav a.on{color:var(--signal);border-bottom-color:var(--signal)}
  .langlink{margin-left:auto;padding-left:18px;flex:none}
  .langlink a{color:var(--muted-2);font-size:13px;font-weight:500;border-bottom:none}
  .langlink a:hover{color:var(--text)}
  .phead{margin-top:24px}
  .phead h1{font-size:clamp(24px,4.2vw,33px);font-weight:700;letter-spacing:-.02em;line-height:1.25}
  .phead .plead{color:var(--muted);font-size:15px;margin-top:11px;max-width:70ch;line-height:1.65}
  .xlinks{display:flex;gap:10px;margin-top:34px;flex-wrap:wrap}
  .xlinks a{flex:1;min-width:210px;background:var(--surface);border:1px solid var(--line);
    border-radius:12px;padding:15px 18px;text-decoration:none;transition:border-color .15s}
  .xlinks a:hover{border-color:var(--signal-dim)}
  .xlinks .xt{font-size:15px;font-weight:600;color:var(--text)}
  .xlinks .xd{color:var(--muted);font-size:13px;margin-top:5px;line-height:1.55}
  @media (max-width:560px){.sitenav a{font-size:13.5px;padding:11px 11px}}