:root{
  --ink:#1a2230; --ink2:#485468; --line:#dfe4ec; --bg:#f6f8fa; --card:#fff;
  --brand:#2b3a55; --accent:#b4622d; --accent-bg:#fdf4ee; --blue:#245a8d; --blue-bg:#eef4fa;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
.wrap{max-width:830px;margin:0 auto;padding:0 20px}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.top{background:var(--brand);color:#fff}
.top .wrap{display:flex;align-items:center;justify-content:space-between;
  height:56px;gap:16px;flex-wrap:wrap}
.brand{color:#fff;font-weight:500;font-size:16px;display:flex;align-items:center;gap:8px}
.brand:hover{text-decoration:none}
.dot{width:8px;height:8px;border-radius:50%;background:#e08b52;display:inline-block}
.nav{display:flex;gap:18px;flex-wrap:wrap}
.nav a{color:#c9d3e2;font-size:14px}
.nav a:hover{color:#fff;text-decoration:none}
.crumb{padding:16px 20px 0;font-size:13px;color:var(--ink2)}
.crumb span{margin:0 6px;color:#b8c0cd}
.crumb .cur{color:var(--ink2);margin:0}
main{padding:8px 0 56px}
h1{font-size:27px;line-height:1.4;font-weight:500;margin:14px 0 10px;letter-spacing:-.2px}
h2{font-size:19px;font-weight:500;margin:38px 0 14px;padding-bottom:8px;
  border-bottom:1px solid var(--line)}
h3{font-size:15px;font-weight:500;margin:0 0 4px}
p{margin:0 0 12px}
.lead{font-size:16px;color:var(--ink2);margin-bottom:18px}
.hint{font-size:14px;color:#7d8798}
.errbox{background:#1e2430;border-left:3px solid var(--accent);border-radius:6px;
  padding:14px 16px;margin:18px 0;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.errtag{font-size:11px;letter-spacing:1px;color:#9aa6b8;border:1px solid #3a4356;
  border-radius:3px;padding:2px 7px;flex:none}
.errbox code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:14px;color:#f0c9a8;word-break:break-word}
.verdict{background:var(--blue-bg);border-left:3px solid var(--blue);border-radius:6px;
  padding:14px 16px;margin:18px 0}
.vtag{font-size:11px;letter-spacing:1px;color:var(--blue);display:block;margin-bottom:4px}
.verdict p{margin:0;font-size:15.5px}
.causes{display:grid;gap:12px}
.cause{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:14px 16px}
.cause p{font-size:14.5px;color:var(--ink2);margin:0}
.steps{list-style:none;counter-reset:s;padding:0;margin:0;display:grid;gap:14px}
.steps li{counter-increment:s;position:relative;padding-left:40px}
.steps li::before{content:counter(s);position:absolute;left:0;top:1px;width:26px;height:26px;
  border-radius:50%;background:var(--brand);color:#fff;font-size:13px;
  display:flex;align-items:center;justify-content:center}
.steps p{font-size:14.5px;color:var(--ink2);margin:2px 0 0}
.dtable{width:100%;border-collapse:collapse;background:var(--card);
  border:1px solid var(--line);border-radius:8px;overflow:hidden;font-size:14.5px}
.dtable th{text-align:left;font-weight:500;font-size:13px;color:var(--ink2);
  background:#eef1f5;padding:9px 14px}
.dtable td{padding:11px 14px;border-top:1px solid var(--line);color:var(--ink2);
  vertical-align:top;line-height:1.6}
.dtable td:first-child{color:var(--ink);width:52%}
.dtable.codes td,.dtable.codes th{width:auto}
.dtable.codes td:first-child{width:76px;white-space:nowrap}
.dtable.codes td.c strong{font-family:ui-monospace,Menlo,Consolas,monospace;
  font-size:13.5px;color:var(--accent);letter-spacing:.3px}
.dtable.codes td.en{font-family:ui-monospace,Menlo,Consolas,monospace;
  font-size:12.5px;color:var(--ink2);line-height:1.5}
.dtable.vs td{width:auto}
.dtable.vs td:first-child{width:35%}
.dtable.vs td:first-child strong{font-family:ui-monospace,Menlo,Consolas,monospace;
  font-size:13px;color:var(--accent);font-weight:400}
.prev{margin:0;padding-left:20px;display:grid;gap:9px}
.prev li{font-size:14.5px;color:var(--ink2);line-height:1.65}
.faqs{display:grid;gap:8px}
details{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:12px 16px}
summary{cursor:pointer;font-weight:500;font-size:15px;list-style:none}
summary::-webkit-details-marker{display:none}
summary::before{content:"+";color:var(--accent);margin-right:8px;font-weight:400}
details[open] summary::before{content:"−"}
.ans{font-size:14.5px;color:var(--ink2);padding-top:10px;margin-top:10px;
  border-top:1px dashed var(--line)}
.rels{display:grid;gap:10px}
.relcard{background:var(--card);border:1px solid var(--line);border-radius:8px;
  padding:12px 15px;display:flex;flex-direction:column;gap:2px}
.relcard:hover{border-color:#b9c4d4;text-decoration:none}
.relcard span{font-size:15px;color:var(--ink)}
.relcard em{font-style:normal;font-size:12.5px;color:#8b95a5;
  font-family:ui-monospace,Menlo,Consolas,monospace}
.upd{font-size:13px;color:#8b95a5;margin-top:32px;padding-top:14px;border-top:1px solid var(--line)}
.hero{padding:26px 0 6px}
.hero h1{margin-top:0}
.grp{margin-top:34px}
.scards{display:grid;gap:10px}
.scard{background:var(--card);border:1px solid var(--line);border-radius:8px;
  padding:14px 16px;display:flex;flex-direction:column;gap:3px;
  transition:border-color .15s,transform .15s}
.scard:hover{border-color:#b9c4d4;transform:translateY(-1px);text-decoration:none}
.scard strong{font-size:15.5px;font-weight:500;color:var(--ink)}
.scard em{font-style:normal;font-size:12.5px;color:var(--accent);
  font-family:ui-monospace,Menlo,Consolas,monospace}
.scard span{font-size:13.5px;color:var(--ink2);line-height:1.6}
.foot{border-top:1px solid var(--line);background:#eef1f5;padding:26px 0 34px;margin-top:20px}
.fnote{font-size:12.5px;color:#77818f;line-height:1.7;margin:0 0 6px}
.fcopy{font-size:12.5px;color:#9aa3b0;margin:14px 0 0}
@media(max-width:600px){
  h1{font-size:22px} h2{font-size:17px}
  .top .wrap{height:auto;padding-top:10px;padding-bottom:10px}
  .nav{gap:12px} .nav a{font-size:13px}
}