:root{--bg:#f6f7f9;--text:#101214;--muted:#646b75;--card:#fff;--border:#e5e7eb;--accent:#1f6feb;--ring:#d2d7df;--emphasis:#b45309;--quote-line:#c8ced7;--font-boost:1.05;--code-bg:#fff;--code-inline-bg:#f3f4f6}html[data-theme=dark]{--bg:#0d0f13;--text:#e8edf3;--muted:#a7afba;--card:#080a0e;--border:#21262d;--accent:#86b6ff;--ring:#2a313a;--emphasis:#f59e0b;--quote-line:#313741;--code-bg:#05070c;--code-inline-bg:#05070c}*{box-sizing:border-box}html,body{height:100%}html{font-size:calc(100%*var(--font-boost))}body{background:var(--bg);color:var(--text);text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;font:1rem/1.6 system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Noto Sans,Ubuntu,Cantarell,Helvetica Neue,Arial,Apple Color Emoji,Segoe UI Emoji}@media (prefers-reduced-motion:no-preference){html.theme-animating,html.theme-animating *{transition:background-color .8s,color .8s,border-color .8s,outline-color .8s,fill .8s,stroke .8s}}.site-header{position:fixed;z-index:10;background:var(--bg);border-bottom:1px solid var(--border);display:grid;grid-template-columns:1fr auto 1fr;align-items: center;gap:8px;padding:16px 20px;top:0;left:0;right:0}.brand,.theme-controls{display:flex}.brand{justify-content:center}.brand-link{color:var(--text);text-decoration:none;letter-spacing:.8px;position:relative;display:inline-block;font-size:clamp(2rem,9vw,4.25rem);font-weight:900;line-height:1}.theme-controls{justify-self:end;align-items: center;gap:8px}.theme-btn{-webkit-appearance:none;appearance:none;border:1px solid var(--border);background:var(--card);color:var(--text);display:inline-flex;cursor:pointer;border-radius:8px;justify-content:center;align-items: center;width:36px;height:36px;padding:0;font-size:18px;line-height:1}.theme-btn .icon{display:block;line-height:1}.theme-btn[aria-pressed=true]{outline:2px solid var(--ring)}.back-link{text-decoration:none;color:var(--text);background:var(--card);border:1px solid var(--border);letter-spacing:.4px;display:none;position:fixed;top:var(--backlink-top,calc(var(--header-h,196px) + 50px));z-index:9;border-radius:10px;padding:6px 10px;font-size:.95rem;font-weight:700;left:calc(50% - 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