:root{--ink:#142432;--muted:#647788;--bg:#f3f6f9;--line:#dce5ed;--blue:#1654c6;--green:#087659;--font:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.65 var(--font)}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}header{height:76px;background:white;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:38px;padding:0 max(30px,calc((100vw - 1340px)/2));white-space:nowrap}.brand{font-size:24px;font-weight:800;color:var(--ink)}.brand span{font-size:15px;margin-left:12px}nav{display:flex;gap:24px}nav a{color:var(--muted);padding:24px 0}nav .on{color:var(--blue);border-bottom:3px solid var(--blue)}header form{margin-left:auto}main{max-width:1340px;padding:0 30px;margin:auto}.page-head{display:flex;align-items:center;justify-content:space-between;margin:40px 0 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