:root{--ink:#16243e;--muted:#6b7890;--paper:#f6f8fc;--line:#e5eaf3;--violet:#6b3df2;--violet2:#a266ff;--orange:#ff8c43;--mint:#28c79a}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.6 Arial,"Microsoft YaHei",sans-serif}a{color:inherit;text-decoration:none}.wrap{max-width:1180px;margin:auto;padding:0 20px}.top{background:#18233b;color:#ccd7eb;font-size:13px}.top .wrap{height:38px;display:flex;align-items:center;justify-content:space-between}.nav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:4}.nav .wrap{height:78px;display:flex;align-items:center;gap:30px}.brand{font-size:23px;font-weight:800;letter-spacing:-1px;color:var(--violet)}.brand b{display:inline-grid;place-items:center;width:27px;height:27px;border-radius:9px;background:linear-gradient(135deg,var(--violet),var(--orange));color:#fff;margin-right:7px}.menu{display:flex;align-items:center;gap:4px;flex:1}.menu a{padding:9px 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