:root{--ink:#17212b;--muted:#657484;--line:#dce5e8;--surface:#fff;--canvas:#f4f7f7;--brand:#0d8f75;--brand-dark:#076550;--dark:#10232b}*{box-sizing:border-box}html,body{margin:0;color:var(--ink);background:var(--canvas);font-family:"Microsoft YaHei","Noto Sans SC",Arial,sans-serif}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line)}.nav-wrap{max-width:1180px;margin:auto;display:flex;align-items:center;min-height:72px;padding:0 22px}.brand{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700}.brand-mark{display:grid;place-items:center;width:34px;height:34px;color:#fff;background:var(--brand);border-radius:5px;font-size:16px}.site-nav{display:flex;gap:6px;margin-left:auto}.site-nav a{padding:10px 13px;color:var(--muted);font-size:14px;border-radius:4px}.site-nav a:hover,.site-nav 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