:root{--parchment:#f5f4ed;--ivory:#faf9f5;--inline-code-bg:#f0eee6;--border:#e8e6dc;--border-soft:#e5e3d8;--brand:#1b365d;--brand-tint:#eef2f7;--tag-bg:#e4ecf5;--near-black:#141413;--dark-warm:#3d3d3a;--charcoal:#4d4c48;--olive:#504e49;--stone:#6b6a64;--paper:var(--parchment);--ink:var(--near-black);--ink-mid:var(--dark-warm);--ink-soft:var(--stone);--rule:var(--border);--rule-strong:#d6d2c4;--measure:760px;--gutter:20px;--header-h:60px;--kai:"TsangerJinKai02", "STKaiti", "Kaiti SC", "KaiTi", "楷体",
    "Baoli SC", "Songti SC", Georgia, serif;--mono:ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace}[data-theme=dark]{--paper:#1a1916;--ink:#e9e5d9;--ink-mid:#c4bda9;--ink-soft:#8e8778;--brand:#a9c1e2;--ivory:#201e1a;--inline-code-bg:#262320;--tag-bg:#26303d;--border:#302c25;--border-soft:#292620;--parchment:#1a1916;--near-black:#e9e5d9;--dark-warm:#c4bda9;--olive:#b3ac95;--stone:#8e8778;--rule:var(--border);--rule-strong:#453f35}*,*::before,*::after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--header-h) + 16px)}body{margin:0;min-height:100vh;display:flex;flex-direction:column;background:var(--paper);color:var(--ink);font-family:var(--kai);font-size:15px;line-height:1.7;letter-spacing:.5px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-autospace:ideograph-alpha ideograph-numeric}::selection{background:#e2e8f2;color:var(--near-black)}.col{width:calc(100% - 2 * var(--gutter));max-width:var(--measure);margin-inline:auto}@media(min-width:1000px){:root{--measure:900px;--gutter:24px}}.skip-link{position:absolute;left:-9999px;top:0;background:var(--ivory);color:var(--brand);padding:8px 14px;z-index:99}.skip-link:focus{left:12px;top:12px}:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:3px}.masthead{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:saturate(180%)blur(10px);-webkit-backdrop-filter:saturate(180%)blur(10px);border-bottom:1px solid var(--border-soft)}.masthead-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:var(--header-h)}.wordmark{display:inline-flex;align-items:center;gap:9px;font-size:17px;font-weight:700;letter-spacing:1px;color:#5c6469;text-decoration:none;transition:color .2s ease}[data-theme=dark] .wordmark .mark{color:#1a1916}.wordmark .mark{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--brand);color:var(--parchment);font-size:14px;font-weight:700;letter-spacing:0;line-height:1}[data-theme=dark] .wordmark{color:var(--ink)}.wordmark:hover{color:var(--brand)}.nav{display:flex;align-items:center;gap:20px}.nav a{font-size:14px;color:var(--ink-soft);text-decoration:none;transition:color .2s ease}.nav a:hover,.nav a[aria-current=page]{color:var(--ink)}.theme-toggle{width:16px;height:16px;padding:0;border:0;background:0 0;color:var(--ink-soft);cursor:pointer;line-height:0;transition:color .2s ease}.theme-toggle:hover{color:var(--ink)}.theme-toggle svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round}main.col{flex:1 0 auto;padding-block:34px 0}.lede{margin-bottom:40px}.lede-title{margin:0 0 10px;font-size:30px;font-weight:700;line-height:1.3;letter-spacing:.5px}.lede-text{margin:0;max-width:34em;font-size:16px;color:var(--ink-mid)}.index-head{margin:0 0 22px;padding-bottom:8px;border-bottom:1px solid var(--border);font-size:15px;font-weight:700;letter-spacing:2px;color:var(--stone)}.entries{list-style:none;margin:0;padding:0}.entry{padding:0 0 26px;margin-bottom:26px;border-bottom:1px solid var(--border-soft)}.entry:last-child{border-bottom:0;margin-bottom:0}.entry-meta{font-size:13px;color:#9aa0a6;margin-bottom:4px}[data-theme=dark] .entry-meta{color:var(--ink-soft)}.entry-title{margin:6px 0 8px;font-size:22px;font-weight:700;line-height:1.35;letter-spacing:.5px}.entry-title a{color:var(--ink);text-decoration:none;transition:color .2s ease}.entry-title a:hover{color:var(--brand)}.entry-summary{margin:0;font-size:16px;color:var(--ink-mid)}.list-head{margin-bottom:32px}.list-title{margin:0;font-size:26px;font-weight:700;letter-spacing:1px}.list-desc{margin-top:10px;color:var(--ink-mid)}.terms{list-style:none;margin:0;padding:0}.term{display:flex;align-items:baseline;gap:8px;padding:7px 0;border-bottom:1px solid var(--border-soft)}.term a{color:var(--ink);text-decoration:none}.term a:hover{color:var(--brand)}.term-count{font-size:13px;color:var(--ink-soft)}.post-head{margin-bottom:22px;text-align:center}.post-title{margin:0 0 10px;font-size:30px;font-weight:700;line-height:1.3;letter-spacing:.5px}.post-meta{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:center;gap:8px;font-size:13px;color:#9aa0a6}[data-theme=dark] .post-meta{color:var(--ink-soft)}.toc{margin:0 0 32px;padding:12px 16px;border:1px solid var(--border);border-radius:8px;background:var(--ivory)}.toc summary{list-style:none;cursor:pointer;font-size:13px;font-weight:700;letter-spacing:2px;color:var(--stone)}.toc summary::-webkit-details-marker{display:none}.toc summary::before{content:"›";display:inline-block;margin-right:8px;transition:transform .2s ease}.toc[open] summary::before{transform:rotate(90deg)}.toc nav{margin-top:12px}.toc ul{list-style:none;margin:0;padding:0;font-size:15px;line-height:1.75}.toc ul ul{padding-left:18px}.toc a{color:var(--ink-mid);text-decoration:none}.toc a:hover{color:var(--brand)}.prose{font-size:18px;line-height:1.9;letter-spacing:.3px}.prose>*:first-child{margin-top:0}.prose>*:last-child{margin-bottom:0}.prose p{margin:0 0 1.1em}.prose h2,.prose h3,.prose h4{scroll-margin-top:calc(var(--header-h) + 20px)}.prose h2{margin:1.9em 0 .7em;font-size:26px;font-weight:700;line-height:1.35;letter-spacing:.5px}.prose h3{margin:1.7em 0 .6em;font-size:22px;font-weight:700;line-height:1.4;letter-spacing:.5px}.prose h4{margin:1.6em 0 .5em;font-size:18px;font-weight:700}.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.5em}.prose li{margin-bottom:6px}.prose li::marker{color:var(--stone)}.prose li>ul,.prose li>ol{margin-top:6px}.prose hr{margin:2.2em 0;border:0;border-top:1px solid var(--border)}.prose a{color:var(--brand);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .2s ease,background-color .2s ease}.prose a:hover{border-bottom-color:var(--brand);background:var(--brand-tint)}[data-theme=dark] .prose a:hover{background:rgba(169,193,226,.12)}.prose strong{font-weight:700}.prose blockquote{margin:1.6em 0;padding:6px 16px;border-left:3px solid #d8d3c3;background:var(--ivory);color:var(--olive)}[data-theme=dark] .prose blockquote{border-left-color:#423c31}.prose blockquote>*:last-child{margin-bottom:0}.prose img{display:block;max-width:100%;height:auto;margin:1.6em auto;border-radius:8px}.prose code{font-family:var(--mono);font-size:.9em;letter-spacing:0;padding:.1em .4em;border:1px solid var(--border);border-radius:4px;background:var(--inline-code-bg);color:var(--brand);white-space:pre-wrap;overflow-wrap:break-word}.prose .highlight,.prose pre{position:relative;margin:1.6em 0;border-radius:8px;background:#15141b;color:#edecee;overflow:hidden}.prose .highlight{padding-top:32px}.prose .highlight::before{content:"";position:absolute;inset:0 0 auto 0;height:32px;border-bottom:1px solid rgba(237,236,238,7%)}.prose .highlight::after{content:"";position:absolute;top:12px;left:14px;width:8px;height:8px;border-radius:50%;background-image:radial-gradient(circle,#ff7f7f 0 100%,transparent 100%),radial-gradient(circle,#ffd7a6 0 100%,transparent 100%),radial-gradient(circle,#8bffe0 0 100%,transparent 100%);background-size:8px 8px,8px 8px,8px 8px;background-position:0 0,12px 0,24px 0;background-repeat:no-repeat}.prose .highlight pre{margin:0;border-radius:0;background:0 0;padding:4px 16px 16px;overflow-x:auto;line-height:1.65}.prose .highlight pre code{padding:0;border:0;background:0 0;color:inherit;font-size:14px;white-space:pre}.code-bar{position:absolute;top:0;left:0;right:0;height:32px;display:flex;align-items:center;justify-content:space-between;padding:0 12px 0 52px;font-family:var(--mono);pointer-events:none}.code-lang{font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:rgba(237,236,238,.55)}.code-copy{pointer-events:auto;padding:2px 8px;border:0;border-radius:4px;background:0 0;color:rgba(237,236,238,.62);font-family:var(--mono);font-size:11px;cursor:pointer;transition:color .2s ease,background-color .2s ease}.code-copy:hover{color:#edecee;background:rgba(162,119,255,.14)}.chroma{background:0 0}.chroma .c,.chroma .c1,.chroma .cm,.chroma .cs{color:#6b6a72;font-style:italic}.chroma .k,.chroma .kc,.chroma .kd,.chroma .kn,.chroma .kr,.chroma .kt{color:#a277ff}.chroma .s,.chroma .s1,.chroma .s2,.chroma .sb,.chroma .sc,.chroma .sd,.chroma .se,.chroma .sh,.chroma .si,.chroma .sr,.chroma .sx{color:#61ffca}.chroma .m,.chroma .mh,.chroma .mi,.chroma .mo,.chroma .mf{color:#ffca85}.chroma .nf,.chroma .fm{color:#ffd7a6}.chroma .o,.chroma .ow{color:#d8d4e0}.chroma .lnt,.chroma .ln{color:#55535e;user-select:none}.prose table{width:100%;margin:1.6em 0;border-collapse:collapse;font-size:15px;letter-spacing:.2px}.prose thead th{padding:8px 12px;border-top:1px solid #cfcabb;border-bottom:1px solid #cfcabb;text-align:left;vertical-align:bottom;font-weight:700}.prose tbody td{padding:7px 12px;border-bottom:1px solid var(--border);vertical-align:top}.prose tbody tr:last-child td{border-bottom:1px solid #cfcabb}.prose .table-scroll{margin:1.6em 0;overflow-x:auto;-webkit-overflow-scrolling:touch}.prose .table-scroll>table{margin:0}.math-display{margin:0}.math-display{opacity:0;animation:math-reveal 0s linear 2s forwards}html.math-ready .math-display{opacity:1;animation:none}@keyframes math-reveal{to{opacity:1}}.katex{font-size:1.04em}.katex-display{margin:1.15em 0;padding-block:.15em;overflow-x:auto;overflow-y:hidden}.katex,.katex *{letter-spacing:0}.post-nav{display:flex;flex-direction:column;gap:14px;margin-top:56px;padding-top:20px;border-top:1px solid var(--border)}.post-nav-link{color:var(--ink);text-decoration:none;transition:color .2s ease}.post-nav-link:hover{color:var(--brand)}.post-nav-link span{display:block;margin-bottom:2px;font-size:12px;font-weight:700;letter-spacing:2px;color:var(--ink-soft)}.colophon{flex:none;margin-top:64px;border-top:1px solid var(--border);background:var(--ivory)}.colophon-inner{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:10px;padding-block:22px 40px;font-size:13px;color:var(--ink-soft)}.colophon-text,.colophon-links{margin:0}.colophon-links{display:flex;gap:18px}.colophon-links a{color:var(--ink-soft);text-decoration:none;transition:color .2s ease}.colophon-links a:hover{color:var(--brand)}@media(max-width:480px){.lede-title,.post-title{font-size:24px}.entry-title{font-size:20px}.prose{font-size:17px}.prose h2{font-size:21px}.prose h3{font-size:18px}.prose table{font-size:13.5px}.prose thead th,.prose tbody td{padding-inline:8px}.nav{gap:14px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}@media print{.masthead,.toc,.post-nav,.skip-link,.code-bar{display:none}body{background:#fff;color:#000;font-size:11pt;letter-spacing:0}.col{width:auto;max-width:none}.prose .highlight,.prose pre{background:#f4f4f4;color:#000}}