:root{--background:#fff;--ink:#191919;--muted:#6b6b6b;--line:#e8e8e8;--soft:#f9f9f8;--header-height:72px;--split:40%;--mono:"SFMono-Regular", Consolas, "Liberation Mono", monospace}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-height) + 24px)}body{background:var(--background);color:var(--ink);-webkit-font-smoothing:antialiased;margin:0;font-family:Arial,PingFang SC,Microsoft YaHei,sans-serif}::selection{color:#fff;background:#202020}a{color:inherit;text-decoration:none}button,a,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,summary:focus-visible{outline:2px solid var(--ink);outline-offset:5px}img{max-width:100%;height:auto}h1,h2,h3,p{margin:0}.site-header{height:var(--header-height);grid-template-columns:var(--split) 1fr;z-index:20;border-bottom:1px solid var(--line);background:#fffffff7;display:grid;position:sticky;top:0}.company-brand{border-right:1px solid var(--line);align-items:center;gap:12px;width:100%;padding:0 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