:root{--paper:#f7f7f4;--ink:#20272c;--muted:#667177;--orange:#e85b2a;--metal:#9ca8ae;--line:#d7d9d6;--max:1440px;--radius:12px;color:var(--ink);background:var(--paper);font-synthesis:none;font-family:Microsoft YaHei UI,Noto Sans SC,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--paper);color:var(--ink);margin:0;line-height:1.6}img{max-width:100%;height:auto;display:block}a{color:inherit;text-underline-offset:.28em}a:focus-visible,button:focus-visible{outline:3px solid var(--orange);outline-offset:4px}::selection{background:var(--orange);color:#fff}.skip-link{z-index:99;background:#fff;padding:.7rem 1rem;position:fixed;top:8px;left:8px;transform:translateY(-140%)}.skip-link:focus{transform:none}.site-header{border-bottom:1px solid var(--line);z-index:30;background:#f7f7f4f5;grid-template-columns:1fr auto 1fr;align-items:center;gap:2rem;height:88px;padding:0 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