:root[data-theme=dark]{--bg-main:#0a0b0e;--bg-card:#12141a;--bg-card-hover:#181b24;--bg-surface:#151821;--border-subtle:#232733;--border-active:#3b4255;--text-primary:#f3f4f6;--text-secondary:#9ca3af;--text-muted:#6b7280;--text-headings:#fff;--accent:#38bdf8;--accent-glow:#38bdf826;--accent-green:#10b981;--code-bg:#050608}:root[data-theme=light]{--bg-main:#f8fafc;--bg-card:#fff;--bg-card-hover:#f1f5f9;--bg-surface:#e2e8f0;--border-subtle:#e2e8f0;--border-active:#cbd5e1;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#64748b;--text-headings:#0f172a;--accent:#0284c7;--accent-glow:#0284c726;--accent-green:#059669;--code-bg:#f1f5f9}html[data-lang=zh] .lang-en{display:none!important}html[data-lang=zh] .lang-zh{display:inline}html[data-lang=zh] div.lang-zh,html[data-lang=zh] p.lang-zh,html[data-lang=zh] h1.lang-zh,html[data-lang=zh] h2.lang-zh,html[data-lang=zh] h3.lang-zh,html[data-lang=zh] section.lang-zh{display:block}html[data-lang=en] .lang-zh{display:none!important}html[data-lang=en] .lang-en{display:inline}html[data-lang=en] div.lang-en,html[data-lang=en] p.lang-en,html[data-lang=en] h1.lang-en,html[data-lang=en] h2.lang-en,html[data-lang=en] h3.lang-en,html[data-lang=en] section.lang-en{display:block}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-main);color:var(--text-primary);-webkit-font-smoothing:antialiased;flex-direction:column;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6;transition:background-color .2s,color .2s;display:flex}a{color:inherit;text-decoration:none}.container{width:100%;max-width:1140px;margin:0 auto;padding:0 1.5rem}h1,h2,h3,h4{color:var(--text-headings);letter-spacing:-.025em;font-weight:700;line-height:1.25}.code-mono{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace}.btn{cursor:pointer;text-align:center;border:1px solid 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1.25rem;font-style:normal;display:block}.prose .proof p{margin-bottom:.5rem}.prose .tablewrap{margin-bottom:1.25rem;overflow-x:auto}.prose .compare{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1rem;margin:1.5rem 0;display:grid}.prose .compare figure{margin:0}.prose figcaption{color:var(--text-muted);margin-top:.4rem;font-size:.85rem}