:root{--canvas:#f7f4ed;--surface:#fffdf8;--surface-2:#f1ece0;--ink:#121a16;--muted:#5b6862;--rule:#e4ddcf;--accent:#075f52;--accent-fg:#fff;--accent-surface:#e2eee9;--marker:#f6d23c;--marker-soft:#fbe7a1;--dot:#e2dccd;--band:#075f52;--band-fg:#fff;--band-muted:#b7d3ca;--risk-high:#c42b1c;--risk-medium:#9a5b00;--risk-low:#15743e;--risk-special:#7a3dbf;--shadow-sm:0 1px 2px #141e1a0f, 0 2px 8px #141e1a0d;--shadow-lg:0 30px 80px -20px #14282047, 0 12px 24px -12px #1428202e;--ease-out:cubic-bezier(.23, 1, .32, 1);--ease-in-out:cubic-bezier(.77, 0, .175, 1);--ease-drawer:cubic-bezier(.32, .72, 0, 1);--radius:22px;--gutter:clamp(18px, 4vw, 40px);--max:1160px;--font-sans:-apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-display:ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;--font-mono:ui-monospace, "SF Mono", Menlo, Consolas, monospace;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--canvas:#101512;--surface:#181e1a;--surface-2:#1f2721;--ink:#eef3ef;--muted:#9aa8a1;--rule:#29322c;--accent:#38d6a4;--accent-fg:#06261d;--accent-surface:#1d2a24;--marker:#e9c533;--marker-soft:#4f4413;--dot:#212923;--band:#0c2e26;--band-fg:#eef3ef;--band-muted:#9fc2b6;--risk-high:#ff6b5a;--risk-medium:#f0a93a;--risk-low:#35c77a;--risk-special:#b389f5;--shadow-sm:0 1px 2px #0000004d;--shadow-lg:0 30px 80px -20px #0009, 0 12px 24px -12px #00000080}}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}body{background-color:var(--canvas);background-image:radial-gradient(var(--dot) 1.1px, transparent 1.2px);color:var(--ink);font:400 17px/1.65 var(--font-sans);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;background-size:22px 22px;margin:0;overflow-x:clip}img,svg{max-width:100%;display:block}a{color:var(--accent);text-underline-offset:3px}button{font:inherit;color:inherit}::selection{background:var(--marker);color:#121a16}:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:8px}.container{width:100%;max-width:var(--max);padding:0 var(--gutter);margin:0 auto}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;overflow:hidden;position:absolute!important}html[data-ui-lang=zh] [data-lang=en],html[data-ui-lang=en] [data-lang=zh]{display:none!important}.topbar{z-index:50;background:color-mix(in srgb, var(--canvas) 100%, transparent);border-bottom:1px solid #0000;transition:border-color .2s,box-shadow .2s;position:relative}@media (width>=820px){.topbar{position:sticky;top:0}.topbar.is-stuck{border-bottom-color:var(--rule);box-shadow:0 6px 24px -18px #0006}}.topbar-inner{align-items:center;gap:14px;height:68px;display:flex}.brand{color:var(--ink);align-items:center;gap:10px;min-width:0;text-decoration:none;display:flex}.brand img{width:34px;height:34px;box-shadow:var(--shadow-sm);border-radius:9px}.brand-text{flex-direction:column;min-width:0;line-height:1.15;display:flex}.wordmark{font:800 19px/1.1 var(--font-display);letter-spacing:-.02em}.wordmark span{color:var(--accent)}.brand-sub{color:var(--muted);white-space:nowrap;text-overflow:ellipsis;font-size:12px;overflow:hidden}.topnav{gap:4px;margin-left:18px;display:none}.topnav a{color:var(--muted);border-radius:999px;padding:8px 12px;font-size:15px;font-weight:500;text-decoration:none;transition:color .16s,background-color .16s;position:relative}@media (hover:hover) and (pointer:fine){.topnav a:hover{color:var(--ink);background:var(--surface-2)}}@media (width>=980px){.topnav{display:flex}}.spacer{flex:1}.langs{background:var(--surface-2);border:1px solid var(--rule);border-radius:999px;flex-shrink:0;grid-auto-columns:1fr;grid-auto-flow:column;padding:3px;display:grid;position:relative}.langs:before{content:"";background:var(--surface);width:calc(50% - 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