:root{color-scheme:light;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans", "Helvetica Neue", Arial, sans-serif;--font-serif:"Iowan Old Style", "Baskerville", "Times New Roman", "Noto Serif CJK SC", "Songti SC", "STSong", serif;--font-mono:"SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Cascadia Mono", "Courier New", monospace;--paper:#fbfaf8;--ink:#151515;--ink-soft:#2b2b2b;--ink-muted:#555;--accent-dark:#151515;--border:#0000001f;--card:#fffefa;--shadow:none;--radius:8px;--nav-hover:#0000000f;--tag-bg:#f2f2f2;--tag-count-bg:#e6e6e6;--blockquote-bg:#f5f5f5;--code-bg:#f2f2f2;--pre-bg:#141414;--pre-ink:#f8f8f2;--focus-ring:#151515;--interactive-hover:#00000013;--transition-fast:.14s ease;--desktop-header-clearance:6.5rem}*{box-sizing:border-box}html,body{min-height:100%;margin:0;padding:0}html{scrollbar-gutter:stable;scroll-behavior:smooth}body{font-family:var(--font-sans);color:var(--ink);background:var(--paper);line-height:1.6}::selection{background:var(--ink);color:var(--paper)}img{max-width:100%;height:auto;display:block}a{color:inherit;transition:color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast), transform var(--transition-fast);text-decoration:none}a:hover{color:var(--accent-dark)}:focus-visible{outline:2px solid var(--focus-ring);outline-offset:3px}[id]{scroll-margin-top:1.5rem}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skip-link{background:var(--card);color:var(--ink);border-radius:999px;padding:.5rem .75rem;position:absolute;top:0;left:-999px}.skip-link:focus{z-index:10;top:1rem;left:1rem}.site-shell{max-width:1100px;min-height:100vh;padding:2.5rem max(1.75rem, env(safe-area-inset-right)) calc(4rem + env(safe-area-inset-bottom)) max(1.75rem, env(safe-area-inset-left));flex-direction:column;margin:0 auto;display:flex}.site-shell>main{flex:1}.site-header{justify-content:space-between;align-items:center;gap:1rem;padding:1.5rem 0 2rem;display:flex}.brand{font-family:var(--font-serif);letter-spacing:.03em;font-size:1.3rem;font-weight:700;line-height:1.2}.header-actions{flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:.9rem;display:flex}.nav-links{gap:1.25rem;font-weight:500;display:flex}.nav-links a{background:0 0;border-radius:999px;align-items:center;min-height:2.25rem;padding:.25rem .45rem;display:inline-flex}.nav-links a:hover{background:var(--nav-hover)}.nav-links a[aria-current=page]{box-shadow:inset 0 -2px 0 var(--ink);background:0 0;border-radius:0;font-weight:650}.language-switch{white-space:nowrap;border:1px solid var(--border);border-radius:999px;align-items:center;gap:.25rem;padding:.12rem;font-size:.82rem;line-height:1;display:inline-flex}.language-switch a{min-height:2rem;color:var(--ink-muted);border-radius:999px;align-items:center;padding:.32rem .55rem;display:inline-flex}.language-switch a[aria-current=page]{background:var(--ink);color:var(--paper)}.language-switch a:hover{background:var(--nav-hover)}.language-switch a[aria-current=page]:hover{background:var(--ink);color:var(--paper)}.hero{max-width:820px;margin-bottom:3.25rem}.hero h1{font-family:var(--font-serif);margin:0 0 1rem;font-size:clamp(2.15rem,5vw,4rem);line-height:1.05}.hero p{max-width:62ch;color:var(--ink-muted);margin:0 0 1.6rem;font-size:1.05rem}.hero-actions{flex-wrap:wrap;gap:.75rem;display:flex}.button{background:var(--ink);min-height:2.75rem;color:var(--paper);box-shadow:none;border:1px solid #0000;border-radius:999px;justify-content:center;align-items:center;gap:.5rem;padding:.65rem 1.1rem;font-weight:600;display:inline-flex}.button:hover{background:var(--ink-soft);color:var(--paper)}.button.outline{color:var(--ink);border-color:var(--border);box-shadow:none;background:0 0}.button.outline:hover{background:var(--nav-hover);color:var(--ink)}.section-title{justify-content:space-between;align-items:baseline;gap:1rem;margin:2.5rem 0 1.25rem;display:flex}.section-title h1,.section-title h2{font-family:var(--font-serif);margin:0;font-size:1.8rem}.section-title span{color:var(--ink-muted);font-size:.95rem}.section-link{min-height:2.25rem;color:var(--ink-muted);align-items:center;gap:.35rem;font-size:.9rem;font-weight:600;display:inline-flex}.section-link:hover{color:var(--ink)}.section-link span{color:inherit;transition:transform var(--transition-fast)}.section-link:hover span{transform:translate(2px)}.page-header{justify-content:space-between;align-items:baseline;gap:1rem;margin:0 0 1.25rem;display:flex}.page-header span{color:var(--ink-muted);flex:none;font-size:.95rem}.page-title{font-family:var(--font-serif);margin:0 0 1rem;font-size:clamp(2rem,4vw,3.2rem);line-height:1.12}.page-header .page-title{margin:0}.posts-list{flex-direction:column;max-width:56rem;display:flex}.post-card{border-top:1px solid var(--border);box-shadow:none;background:0 0;border-radius:0;padding:1.4rem 0;display:block}.post-card:last-child{border-bottom:1px solid var(--border)}.post-card-series{color:var(--ink-muted);flex-wrap:wrap;align-items:center;gap:.45rem;margin-bottom:.5rem;font-size:.78rem;line-height:1.4;display:flex}.series-kicker,.series-position,.series-label{border:1px solid var(--border);background:var(--card);color:var(--ink);border-radius:999px;align-items:center;padding:.12rem .45rem;display:inline-flex}.series-title{color:var(--ink-muted)}.post-card h3{margin:0 0 .5rem;font-size:1.15rem}.post-card-title:hover{text-underline-offset:.18em;text-decoration:underline .08em}.post-card p{max-width:72ch;color:var(--ink-muted);margin:0 0 .75rem}.post-card-meta{flex-wrap:wrap;align-items:center;gap:.6rem;display:flex}.meta{color:var(--ink-muted);font-size:.9rem}.post-meta-row{flex-wrap:wrap;align-items:center;gap:.75rem;display:flex}.post-meta-row .meta{margin:0}.language-badge{border:1px solid var(--border);color:var(--ink-muted);border-radius:999px;align-items:center;padding:.25rem .55rem;font-size:.78rem;line-height:1;display:inline-flex}.category-label,.category-pill{border:1px solid var(--border);background:var(--card);min-height:1.9rem;color:var(--ink);border-radius:999px;align-items:center;gap:.35rem;padding:.25rem .6rem;font-size:.78rem;line-height:1;display:inline-flex}.category-label:hover,.category-pill:hover,.tag:hover{background:var(--interactive-hover)}.translation-links{color:var(--ink-muted);flex-wrap:wrap;align-items:center;gap:.5rem;margin-top:1rem;font-size:.9rem;display:flex}.translation-links a{color:var(--ink);border-bottom:1px solid}.tag-list{flex-wrap:wrap;gap:.5rem;margin-top:.75rem;display:flex}.tag{background:var(--tag-bg);min-height:1.9rem;color:var(--ink);border-radius:999px;align-items:center;gap:.35rem;padding:.2rem .6rem;font-size:.78rem;display:inline-flex}.filter-groups{border-bottom:1px solid var(--border);max-width:56rem;margin-bottom:1.75rem;padding-bottom:1.5rem}.filter-group+.filter-group{margin-top:1rem}.filter-label{color:var(--ink-muted);margin:0 0 .55rem;font-size:.78rem;font-weight:650}.tag-filter,.category-filter{flex-wrap:wrap;gap:.6rem;margin:0;display:flex}.tag-count{background:var(--tag-count-bg);border-radius:999px;padding:.05rem .4rem;font-size:.7rem}.tag-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;display:grid}.tag-card{background:var(--card);border-radius:var(--radius);border:1px solid var(--border);box-shadow:none;transition:background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);justify-content:space-between;align-items:flex-start;gap:1rem;padding:1.35rem 1.4rem;display:flex}.tag-card:hover{background:var(--nav-hover);border-color:color-mix(in srgb, var(--ink) 22%, transparent);transform:translateY(-1px)}.tag-card h2{margin:0 0 .4rem;font-size:1.1rem}.tag-card:hover h2{text-underline-offset:.2em;text-decoration:underline .06em}.tag-card p{color:var(--ink-muted);margin:0}.taxonomy-card-copy{min-width:0}.taxonomy-arrow{color:var(--ink-muted);transition:transform var(--transition-fast);flex:none;font-size:1.05rem}.tag-card:hover .taxonomy-arrow{color:var(--ink);transform:translate(2px)}.article-page{overflow-wrap:anywhere}.article-reading-layout{max-width:74ch}.article-main-column{min-width:0}.article-toc-rail{display:none}.page-shell{overflow-wrap:anywhere;max-width:48rem;margin-right:auto}.page-lede{max-width:42rem;color:var(--ink-soft);margin:0 0 1.25rem;font-size:1.1rem;line-height:1.72}.page-secondary{max-width:42rem;color:var(--ink-muted);margin:0 0 1.5rem;font-size:.95rem}.article-header{border-bottom:1px solid var(--border);max-width:74ch;margin-bottom:2rem;padding-bottom:1.5rem}.article-header .post-meta-row{margin-bottom:.7rem}.article-title{font-family:var(--font-serif);margin:0 0 .65rem;font-size:clamp(2rem,4.5vw,3.2rem);line-height:1.1}.article-series{color:var(--ink-muted);flex-wrap:wrap;gap:.4rem;margin:.65rem 0 0;font-size:.86rem;display:flex}.article-series span{color:var(--ink);font-weight:650}.article-description{max-width:66ch;color:var(--ink-muted);margin:.9rem 0 0;font-size:1.02rem;line-height:1.65}.article-tags{margin-top:.9rem}.post-content{color:var(--ink-soft);font-size:1.05rem;line-height:1.72}html:lang(zh-CN) .post-content{line-height:1.82}.post-content>:first-child{margin-top:0}.post-content h2,.post-content h3,.post-content h4,.post-content h5,.post-content h6{font-family:var(--font-serif);color:var(--ink);margin-top:2.2rem;line-height:1.25}.post-content h2{font-size:1.65rem}.post-content h3{font-size:1.35rem}.post-content h4,.post-content h5,.post-content h6{font-size:1.1rem}.post-content p{margin:1.25rem 0}.post-content ul,.post-content ol{margin:1.25rem 0;padding-left:1.5rem}.post-content li+li{margin-top:.35rem}.post-content figure{margin:2rem 0}.post-content figure img{margin-inline:auto}.post-content figcaption{color:var(--ink-muted);text-align:center;margin-top:.65rem;font-size:.85rem;line-height:1.45}.post-content hr{border:0;border-top:1px solid var(--border);margin:2.5rem 0}.post-content video,.post-content iframe{max-width:100%;display:block}.post-content video{height:auto}.post-content iframe{aspect-ratio:16/9;border:0;width:100%}.post-content .footnotes{border-top:1px solid var(--border);margin-top:3rem;padding-top:1.5rem;font-size:.9rem}.post-content .footnotes h2{margin-top:0;font-size:1.2rem}.post-content a{text-underline-offset:.2em;text-decoration:underline .06em}.toc-rail-sticky{max-width:15rem;max-height:inherit;overscroll-behavior:contain;scrollbar-width:thin;overflow-y:auto}.toc-rail-header{z-index:1;border-bottom:1px solid var(--border);color:var(--ink);background:var(--paper);justify-content:space-between;align-items:baseline;gap:.75rem;margin-bottom:.65rem;padding-bottom:.55rem;font-size:.78rem;font-weight:650;display:flex;position:sticky;top:0}.toc-progress{color:var(--ink-muted);font-variant-numeric:tabular-nums;flex:none;font-weight:500}.toc-list{margin:0;padding:0;list-style:none}.toc-list li+li{margin-top:.18rem}.toc-navigation a{color:var(--ink-muted);overflow-wrap:anywhere;border-left:2px solid #0000;padding:.38rem .25rem .38rem .7rem;font-size:.86rem;line-height:1.45;display:block}.toc-navigation a:hover{color:var(--ink)}.toc-navigation a[aria-current=true]{border-left-color:var(--ink);color:var(--ink);font-weight:650}.toc-navigation .toc-subheading a{padding-left:1.3rem;font-size:.82rem}.mobile-toc-launcher{right:1.25rem;bottom:calc(1.25rem + env(safe-area-inset-bottom));z-index:30;border:1px solid var(--border);background:color-mix(in srgb, var(--paper) 94%, transparent);min-height:3rem;color:var(--ink);font:inherit;-webkit-backdrop-filter:blur(12px);opacity:0;pointer-events:none;transition:opacity var(--transition-fast), transform var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);border-radius:999px;justify-content:center;align-items:center;padding:.65rem .95rem;font-size:.88rem;font-weight:650;display:inline-flex;position:fixed;transform:translateY(10px);box-shadow:0 10px 28px #00000024}.mobile-toc-launcher[hidden]{display:none}.mobile-toc-launcher[data-visible=true]{opacity:1;pointer-events:auto;transform:translateY(0)}.mobile-toc-launcher[aria-expanded=true]{opacity:0;pointer-events:none}.mobile-toc-launcher:hover{background:var(--card);border-color:color-mix(in srgb, var(--ink) 22%, transparent)}.toc-launcher-separator{color:var(--ink-muted);margin:0 .35rem}.toc-sheet{z-index:40;background:var(--paper);width:min(100%,42rem);max-width:none;max-height:min(78dvh,42rem);color:var(--ink);border:0;border-radius:20px 20px 0 0;margin:auto auto 0;padding:0;position:fixed;inset:auto 0 0;overflow:hidden;box-shadow:0 -18px 48px #00000038}.toc-sheet[open]{flex-direction:column;display:flex}.toc-sheet::backdrop{background:#0000004d}.toc-sheet-handle{background:var(--border);border-radius:999px;width:2.8rem;height:.28rem;margin:.65rem auto .25rem}.toc-sheet-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:flex-start;gap:1rem;padding:.85rem 1.25rem .75rem;display:flex}.toc-sheet-header h2{font-family:var(--font-serif);margin:0;font-size:1.35rem;line-height:1.2}.toc-sheet-status{color:var(--ink-muted);font-variant-numeric:tabular-nums;flex-wrap:wrap;gap:.35rem;margin:.35rem 0 0;font-size:.78rem;display:flex}.toc-sheet-status strong{color:var(--ink);font-weight:650}.toc-sheet-close{background:var(--tag-bg);width:2.75rem;height:2.75rem;color:var(--ink);font:inherit;cursor:pointer;border:0;border-radius:999px;flex:none;padding:0;font-size:1.55rem;line-height:1}.toc-sheet-close:hover{background:var(--interactive-hover)}.toc-navigation-sheet{min-height:0;padding:.85rem 1.25rem calc(1.25rem + env(safe-area-inset-bottom));overscroll-behavior:contain;overflow-y:auto}.toc-navigation-sheet a{min-height:2.75rem;padding-top:.65rem;padding-bottom:.65rem;font-size:.95rem}.toc-navigation-sheet .toc-subheading a{font-size:.9rem}.post-toc-noscript{border:1px solid var(--border);border-radius:var(--radius);background:var(--card);max-width:74ch;margin:2rem 0;padding:.85rem 1rem}.post-toc-noscript summary{cursor:pointer;font-weight:650}.series-navigation{border-top:1px solid var(--border);flex-wrap:wrap;gap:.8rem;margin-top:3rem;padding-top:1.5rem;display:flex}.series-link{border:1px solid var(--border);border-radius:var(--radius);background:var(--card);flex:15rem;min-height:5rem;padding:.9rem 1rem}.series-link:hover{background:var(--interactive-hover);border-color:color-mix(in srgb, var(--ink) 22%, transparent)}.series-link.next{text-align:right}.series-navigation span{color:var(--ink-muted);margin-bottom:.35rem;font-size:.8rem;font-weight:600;display:block}.post-content table{border-collapse:collapse;width:100%;margin:1.5rem 0;font-size:.95rem}.post-content th,.post-content td{border:1px solid var(--border);text-align:left;vertical-align:top;overflow-wrap:anywhere;padding:.65rem .85rem}.post-content th{background:var(--card)}.post-content blockquote{background:var(--blockquote-bg);border-left:4px solid var(--ink);border-radius:12px;margin:1.5rem 0;padding:1rem 1.2rem}.post-content blockquote>:first-child{margin-top:0}.post-content blockquote>:last-child{margin-bottom:0}.post-content code{font-family:var(--font-mono);background:var(--code-bg);border-radius:6px;padding:.1rem .35rem;font-size:.9rem}.post-content pre{background:var(--pre-bg);color:var(--pre-ink);border-radius:14px;margin:1.5rem 0;padding:1.2rem;overflow-x:auto}.post-content pre code{color:inherit;background:0 0;padding:0}.footer{border-top:1px solid var(--border);color:var(--ink-muted);flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:1rem;margin-top:4rem;padding-top:2rem;font-size:.88rem;display:flex}.footer-meta{flex-wrap:wrap;align-items:center;gap:.9rem;display:flex}.footer a{color:var(--ink);text-underline-offset:.2em;text-decoration:underline .05em}@media (width>=901px){.site-header{z-index:20;background:color-mix(in srgb, var(--paper) 94%, transparent);-webkit-backdrop-filter:blur(12px);position:sticky;top:0}[id]{scroll-margin-top:calc(var(--desktop-header-clearance) + .5rem)}}@media (width>=1120px){.article-reading-layout.has-toc{grid-template-columns:minmax(0,74ch) minmax(12.5rem,1fr);align-items:start;column-gap:clamp(2.75rem,4vw,4rem);max-width:none;display:grid}.article-toc-rail{top:var(--desktop-header-clearance);min-width:0;max-height:calc(100vh - var(--desktop-header-clearance) - 1rem);align-self:start;display:block;position:sticky}.mobile-toc-launcher,.toc-sheet{display:none}}@media (width<=900px){.site-header{flex-direction:column;align-items:flex-start;gap:1rem}.header-actions{flex-wrap:nowrap;justify-content:space-between;width:100%}.nav-links{flex-wrap:wrap}}@media (width<=700px){.site-shell{padding:2rem max(1.5rem, env(safe-area-inset-right)) calc(3rem + env(safe-area-inset-bottom)) max(1.5rem, env(safe-area-inset-left))}.site-header{flex-direction:column;align-items:flex-start;padding:1rem 0 1.5rem}.hero{margin-bottom:2.5rem}.hero p{font-size:1rem}.tag-grid{grid-template-columns:1fr}.article-header{margin-bottom:1.5rem;padding-bottom:1.25rem}.mobile-toc-launcher{left:50%;right:auto;bottom:calc(1rem + env(safe-area-inset-bottom));min-width:8.5rem;transform:translate(-50%,10px)}.mobile-toc-launcher[data-visible=true]{transform:translate(-50%)}.article-description{font-size:.98rem}.post-content{font-size:1rem}.page-lede{font-size:1.02rem}.nav-links{flex-wrap:wrap;justify-content:flex-start;gap:.35rem .8rem;width:100%;font-size:.95rem}.nav-links a{min-height:2.5rem;padding:.35rem .2rem}.language-switch a{min-height:2.25rem}.category-label,.category-pill,.tag{min-height:2.15rem}.header-actions{flex-direction:column;align-items:flex-start;gap:.65rem;width:100%}.section-title,.page-header{flex-direction:column;align-items:flex-start;gap:.35rem}.footer{flex-direction:column}}@media print{.article-toc-rail,.mobile-toc-launcher,.toc-sheet,.post-toc-noscript{display:none!important}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}@media (prefers-color-scheme:dark){:root{color-scheme:dark;--paper:#0f0f10;--ink:#f5f5f5;--ink-soft:#d7d7d7;--ink-muted:#b0b0b0;--accent-dark:#fff;--border:#ffffff24;--card:#161616;--shadow:0 8px 18px #00000080;--nav-hover:#ffffff14;--tag-bg:#1f1f1f;--tag-count-bg:#2a2a2a;--blockquote-bg:#1a1a1a;--code-bg:#1b1b1b;--pre-bg:#0d0d0d;--pre-ink:#f5f5f5;--focus-ring:#f5f5f5;--interactive-hover:#ffffff1a}}