:root{--bg:#fff;--fg:#1f1f1f;--muted:#4d5156;--faint:#70757a;--line:#dadce0;--link:#1a0dab;--url:#006621;--accent:#035b71;--accent-soft:#e3eff2;--gold:#b99f62;--mark:#fff3bf;--surface:#f8f9fa;--radius:24px;--page-background:var(--bg)}:root[data-theme=dark]{--bg:#14171a;--fg:#e8eaed;--muted:#bdc1c6;--faint:#9aa0a6;--line:#3c4043;--link:#8ab4f8;--url:#86c99a;--accent:#5cb8cc;--accent-soft:#15272c;--gold:#cdb57a;--mark:#5c4b12;--surface:#1e2125}.sitehead{z-index:10;background:color-mix(in srgb,var(--bg)92%,transparent);-webkit-backdrop-filter:saturate(1.4)blur(8px);border-bottom:1px solid var(--line);font-family:var(--font-inter),-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;position:sticky;top:0}.topnav__inner{align-items:center;gap:24px;min-height:80px;padding:0 24px;display:flex}.sitehead .topnav__brand{flex:none;align-items:center;gap:10px;text-decoration:none;display:inline-flex}.sitehead .topnav__brand .logo__mark img{height:52px}.sitehead .topnav__brand 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