:root{--font-zh: system-ui, -apple-system, "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", "Heiti SC", sans-serif;--font-en: "Iowan Old Style", Charter, "Bitstream Charter", "Source Serif 4", "Songti SC", Georgia, "Times New Roman", serif;--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;--bg: #ffffff;--bg-soft: #f7f7f5;--bg-card: #fbfbf9;--text: #1a1a1a;--text-soft: #4a4a4a;--muted: #757575;--faint: #9a9a9a;--rule: #e6e6e2;--rule-strong: #d4d4ce;--accent: #0d6b58;--accent-soft: #e6f2ee;--selection: #d9ece6;--measure: 44rem;--rail: 15rem;--gutter: 4rem;--radius: 6px}:root[data-theme=dark]{--bg: #101215;--bg-soft: #171a1e;--bg-card: #16191d;--text: #e8e8e6;--text-soft: #c2c4c2;--muted: #8f9295;--faint: #6d7073;--rule: #262a2f;--rule-strong: #343a41;--accent: #5cbfa2;--accent-soft: #16302a;--selection: #204036}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg: #101215;--bg-soft: #171a1e;--bg-card: #16191d;--text: #e8e8e6;--text-soft: #c2c4c2;--muted: #8f9295;--faint: #6d7073;--rule: #262a2f;--rule-strong: #343a41;--accent: #5cbfa2;--accent-soft: #16302a;--selection: #204036}}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:5rem}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-zh);font-size:17px;line-height:1.8;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}::selection{background:var(--selection)}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}img,video{max-width:100%;height:auto}hr{border:0;border-top:1px solid var(--rule);margin:3rem 0}.wrap{width:100%;max-width:72rem;margin:0 auto;padding:0 1.5rem}.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--rule)}.site-header .wrap{display:flex;align-items:center;gap:1.5rem;height:3.75rem}.brand{display:flex;align-items:baseline;gap:.55rem;margin-right:auto;min-width:0}.brand-zh{font-size:1.15rem;font-weight:700;letter-spacing:.04em;white-space:nowrap}.brand-en{flex:none;white-space:nowrap;font-family:var(--font-en);font-size:.8rem;color:var(--muted);letter-spacing:.1em;text-transform:uppercase}.nav{display:flex;align-items:center;gap:1.25rem;font-size:.875rem;color:var(--muted);white-space:nowrap}.nav a:hover{color:var(--text)}.nav a[aria-current=page]{color:var(--text);font-weight:600}.theme-toggle{display:grid;place-items:center;width:2rem;height:2rem;padding:0;border:1px solid var(--rule);border-radius:999px;background:transparent;color:var(--muted);cursor:pointer}.theme-toggle:hover{color:var(--text);border-color:var(--rule-strong)}.theme-toggle svg{width:15px;height:15px}:root[data-theme=dark] .icon-sun,:root:not([data-theme=light]) .icon-sun{display:none}:root[data-theme=dark] .icon-moon,:root:not([data-theme=light]) .icon-moon{display:block}.icon-moon{display:none}@media(prefers-color-scheme:light){:root:not([data-theme=dark]) .icon-sun{display:block}:root:not([data-theme=dark]) .icon-moon{display:none}}.site-footer{margin-top:6rem;border-top:1px solid var(--rule);padding:2.5rem 0 4rem;color:var(--muted);font-size:.8125rem}.site-footer .wrap{display:flex;flex-direction:column;gap:1rem}.site-footer a:hover{color:var(--text)}.footer-row{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem 1.75rem}.footer-brand{color:var(--text-soft)}.footer-note{margin-left:auto}.footer-legal{padding-top:1rem;border-top:1px solid var(--rule);color:var(--faint);font-size:.75rem}.powered-by{margin-left:auto;font-family:var(--font-en);letter-spacing:.06em}.powered-by span{color:var(--text-soft);font-weight:600}.powered-by:hover span{color:var(--accent)}.home-hero{padding:4rem 0 2.5rem;border-bottom:1px solid var(--rule)}.home-hero h1{margin:0 0 .75rem;font-size:clamp(2rem,5vw,2.75rem);letter-spacing:.02em}.home-hero p{margin:0;max-width:34rem;color:var(--muted);font-size:1rem;line-height:1.75}.home-hero.is-slim{padding:3rem 0 1.75rem}.home-hero.is-slim h1{font-size:1.6rem}.post-day+.post-day{margin-top:2.5rem}.post-day-head{position:sticky;top:3.75rem;z-index:10;display:flex;align-items:baseline;gap:.6rem;margin:0;padding:.85rem 0 .6rem;background:var(--bg);border-bottom:1px solid var(--rule-strong);font-size:.8125rem;font-weight:600;letter-spacing:.08em;color:var(--text-soft)}.post-day-count{font-size:.6875rem;font-weight:400;letter-spacing:.06em;color:var(--faint)}.post-list{list-style:none;margin:0;padding:0}.post-list>li{border-bottom:1px solid var(--rule)}.post-card{padding:2.25rem 0}.post-card-main{display:block}.post-card:hover .post-card-title{color:var(--accent)}.post-card-meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem .75rem;font-size:.75rem;color:var(--muted);margin-bottom:.6rem}.post-card-title{margin:0 0 .5rem;font-size:1.45rem;line-height:1.5;font-weight:700;letter-spacing:.01em;transition:color .15s ease}.post-card-title-en{display:block;font-family:var(--font-en);font-size:.95rem;font-weight:400;color:var(--muted);line-height:1.5;margin-top:.3rem}.post-card-summary{margin:0 0 .85rem;color:var(--text-soft);font-size:.95rem;line-height:1.85;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.post-card-tags{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.25rem}.badge{display:inline-flex;align-items:center;gap:.3em;padding:.15em .5em;border:1px solid var(--rule-strong);border-radius:3px;font-size:.6875rem;letter-spacing:.04em;color:var(--muted);white-space:nowrap}.badge-accent{border-color:transparent;background:var(--accent-soft);color:var(--accent)}.tag{font-size:.75rem;color:var(--muted);background:var(--bg-soft);padding:.2em .6em;border-radius:999px}a.tag:hover{color:var(--text);background:var(--rule)}time.meta{font-variant-numeric:tabular-nums}.empty{padding:4rem 0;color:var(--muted)}.article-layout{display:grid;grid-template-columns:minmax(0,var(--measure));justify-content:center;gap:var(--gutter);padding:3rem 0 0}@media(min-width:1100px){.article-layout{grid-template-columns:minmax(0,var(--measure)) var(--rail);justify-content:center}}.article-head{margin-bottom:2rem}.article-kicker{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem .75rem;font-size:.75rem;color:var(--muted);margin-bottom:1rem}.article-title{margin:0 0 .6rem;font-size:clamp(1.85rem,4.5vw,2.5rem);line-height:1.4;letter-spacing:.01em;font-weight:800}.article-title-en{margin:0 0 1.5rem;font-family:var(--font-en);font-size:1.05rem;font-weight:400;line-height:1.5;color:var(--muted)}.source-card{border:1px solid var(--rule);border-radius:var(--radius);background:var(--bg-card);padding:1.25rem 1.35rem;margin-bottom:1.75rem;font-size:.875rem}.source-card-label{display:block;font-size:.6875rem;letter-spacing:.16em;color:var(--faint);margin-bottom:.7rem}.source-title{font-family:var(--font-en);font-size:1rem;line-height:1.5;color:var(--text);border-bottom:1px solid var(--rule-strong);padding-bottom:1px}.source-title:hover{color:var(--accent);border-color:var(--accent)}.source-meta{margin:.6rem 0 0;display:flex;flex-wrap:wrap;gap:.35rem .9rem;color:var(--muted);font-size:.8125rem}.source-people{margin:.85rem 0 0;padding:.8rem 0 0;border-top:1px dashed var(--rule);list-style:none;display:grid;gap:.35rem}.source-people li{font-size:.8125rem;color:var(--muted)}.source-people b{color:var(--text-soft);font-weight:600}.source-links{margin:.85rem 0 0;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:.5rem 1rem;font-size:.8125rem}.source-links a{color:var(--accent)}.source-links a:hover{text-decoration:underline}.summary{margin-bottom:2.5rem}.summary-label{display:block;font-size:.6875rem;letter-spacing:.16em;color:var(--faint);margin-bottom:.6rem}.summary-zh{margin:0;font-size:1.02rem;line-height:1.95;color:var(--text-soft);border-left:3px solid var(--accent);padding-left:1.1rem;white-space:pre-line}.summary-en-toggle{margin-top:1rem;border-top:1px solid var(--rule);padding-top:.8rem}.summary-en-toggle>summary{cursor:pointer;font-size:.8125rem;color:var(--muted);list-style:none;display:flex;align-items:center;gap:.4rem}.summary-en-toggle>summary::-webkit-details-marker{display:none}.summary-en-toggle>summary:before{content:"▸";font-size:.7em;transition:transform .15s ease}.summary-en-toggle[open]>summary:before{transform:rotate(90deg)}.summary-en{margin:.8rem 0 0;font-family:var(--font-en);font-size:.95rem;line-height:1.75;color:var(--muted);white-space:pre-line}.prose{font-size:1.0625rem}.prose>p{margin:1.4rem 0;line-height:1.9;color:var(--text-soft)}.prose a:not(.ch-time){color:var(--accent);border-bottom:1px solid color-mix(in srgb,var(--accent) 35%,transparent)}.prose a:not(.ch-time):hover{border-bottom-color:var(--accent)}.prose ul,.prose ol{padding-left:1.4rem;margin:1.4rem 0}.prose li{margin:.5rem 0;line-height:1.85;color:var(--text-soft)}.prose blockquote{margin:1.75rem 0;padding:.2rem 0 .2rem 1.2rem;border-left:3px solid var(--rule-strong);color:var(--muted);font-size:.95rem}.prose blockquote p{margin:.5rem 0}.prose code{font-family:var(--font-mono);font-size:.875em;background:var(--bg-soft);padding:.15em .4em;border-radius:3px}.prose pre{margin:1.6rem 0;padding:1rem 1.1rem;border-radius:var(--radius);overflow-x:auto;font-size:.8125rem;line-height:1.7}.prose pre code{background:none;padding:0;font-size:inherit}.prose table{width:100%;border-collapse:collapse;margin:1.6rem 0;font-size:.875rem;display:block;overflow-x:auto}.prose th,.prose td{border-bottom:1px solid var(--rule);padding:.55rem .7rem;text-align:left}.prose th{color:var(--muted);font-weight:600;font-size:.8125rem}.prose img{border-radius:var(--radius);margin:1.75rem 0}.prose hr{margin:2.75rem 0}.prose h2.chapter,.prose h3.chapter{margin:3.25rem 0 1.25rem;line-height:1.45;letter-spacing:.01em}.prose h2.chapter{font-size:1.4rem;font-weight:700}.prose h3.chapter{font-size:1.15rem;font-weight:700}.prose .ch-time{display:inline-block;font-family:var(--font-mono);font-size:.75rem;font-weight:500;color:var(--muted);background:var(--bg-soft);border:1px solid var(--rule);border-radius:3px;padding:.1em .45em;margin-bottom:.5rem;letter-spacing:.02em}a.ch-time:hover{color:var(--accent);border-color:var(--accent);background:var(--accent-soft)}.prose .ch-zh{display:block}.prose .ch-en{display:block;font-family:var(--font-en);font-size:.875rem;font-weight:400;color:var(--muted);margin-top:.2rem}.prose h4{margin:2rem 0 .75rem;font-size:1rem}.bi{margin:1.6rem 0}.bi+.bi{margin-top:1.9rem}.bi-speaker{margin:0 0 .5rem;font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}.bi-zh{margin:0 0 .45rem;font-family:var(--font-zh);font-size:1.0625rem;line-height:1.95;color:var(--text)}.bi-en{margin:0;font-family:var(--font-en);font-size:.9375rem;line-height:1.7;color:var(--muted)}.bi-zh+.bi-zh,.bi-en+.bi-en{margin-top:.45rem}.rail{display:none}@media(min-width:1100px){.rail{display:block}}.rail-inner{position:sticky;top:5.25rem;max-height:calc(100vh - 7rem);overflow-y:auto;overscroll-behavior:contain;padding-right:.25rem;scrollbar-width:thin}.rail-label{font-size:.6875rem;letter-spacing:.16em;color:var(--faint);margin-bottom:1rem}.timeline{list-style:none;margin:0;padding:0 0 0 1rem;position:relative}.timeline:before{content:"";position:absolute;left:3px;top:.45rem;bottom:.45rem;width:1px;background:var(--rule)}.timeline li{position:relative}.timeline li.depth-3{padding-left:.9rem}.timeline a{display:block;padding:.4rem 0;color:var(--muted);font-size:.8125rem;line-height:1.5;transition:color .15s ease}.timeline a:before{content:"";position:absolute;left:-1rem;top:.95rem;width:7px;height:7px;border-radius:50%;background:var(--rule-strong);transition:background .15s ease,transform .15s ease}.timeline li.depth-3 a:before{left:-1.9rem;width:5px;height:5px;top:1rem}.timeline a:hover{color:var(--text)}.timeline a:hover:before{background:var(--muted)}.timeline .tl-time{display:block;font-family:var(--font-mono);font-size:.6875rem;color:var(--faint);letter-spacing:.02em}.timeline a[aria-current=true]{color:var(--accent);font-weight:600}.timeline a[aria-current=true]:before{background:var(--accent);transform:scale(1.25)}.timeline a[aria-current=true] .tl-time{color:var(--accent)}.rail-mobile{margin:0 0 2.5rem;border:1px solid var(--rule);border-radius:var(--radius);background:var(--bg-card);padding:.85rem 1.1rem}@media(min-width:1100px){.rail-mobile{display:none}}.rail-mobile>summary{cursor:pointer;font-size:.8125rem;color:var(--text-soft);list-style:none;display:flex;align-items:center;gap:.45rem}.rail-mobile>summary::-webkit-details-marker{display:none}.rail-mobile>summary:before{content:"▸";font-size:.7em;color:var(--muted);transition:transform .15s ease}.rail-mobile[open]>summary:before{transform:rotate(90deg)}.rail-mobile .timeline{margin-top:.9rem}.article-foot{margin-top:4rem;padding-top:2rem;border-top:1px solid var(--rule)}.article-foot-tags{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.75rem}.contributed{margin-top:1.5rem;font-size:.75rem;color:var(--faint)}.related{margin-top:3rem;padding-top:1.75rem;border-top:1px dashed var(--rule)}.related-label{margin:0 0 1rem;font-size:.6875rem;font-weight:600;letter-spacing:.12em;color:var(--faint);font-family:var(--font-en)}.related-list{list-style:none;margin:0;padding:0;display:grid;gap:.25rem}.related-list a{display:block;padding:.85rem 1rem;margin:0 -1rem;border-radius:var(--radius);transition:background .15s ease}.related-list a:hover{background:var(--bg-soft)}.related-list a:hover .related-title{color:var(--accent)}.related-meta{display:flex;align-items:baseline;gap:.75rem;font-size:.75rem;color:var(--faint)}.related-match{font-family:var(--font-mono)}.related-title{margin:.3rem 0 0;font-size:1rem;font-weight:600;line-height:1.55}.related-tags{display:flex;flex-wrap:wrap;gap:.35rem;margin-top:.5rem}.related-tags .tag{font-size:.6875rem}.pager{display:flex;justify-content:space-between;gap:1.5rem;margin-top:3rem}.pager a{flex:1 1 0;min-width:0;font-size:.875rem;color:var(--muted)}.pager a:hover{color:var(--accent)}.pager .pager-dir{display:block;font-size:.6875rem;letter-spacing:.12em;color:var(--faint);margin-bottom:.3rem}.pager .pager-next{text-align:right}.progress{position:fixed;top:0;left:0;height:2px;width:100%;transform-origin:0 50%;transform:scaleX(0);background:var(--accent);z-index:30}.tag-cloud-hint{margin:0 0 1.5rem;font-size:.8125rem;color:var(--faint)}.tag-cloud{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:center;gap:.6rem 1.15rem;padding:.5rem 0 1rem}.tag-cloud-item{display:inline-flex;align-items:baseline;gap:.3em;line-height:1.5;color:var(--text-soft);transition:color .15s ease}.tag-cloud-item:hover{color:var(--accent)}.tag-cloud-item[data-level="1"]{font-size:.875rem;color:var(--muted)}.tag-cloud-item[data-level="2"]{font-size:1.0625rem}.tag-cloud-item[data-level="3"]{font-size:1.35rem}.tag-cloud-item[data-level="4"]{font-size:1.75rem;font-weight:600;color:var(--text)}.tag-cloud-item[data-level="5"]{font-size:2.25rem;font-weight:700;color:var(--accent)}.tag-cloud-count{font-family:var(--font-mono);font-size:.6875rem;font-weight:400;color:var(--faint)}.pagination{display:flex;align-items:center;flex-wrap:wrap;gap:.5rem;margin:3rem 0 0;font-size:.875rem}.pagination-pages{display:flex;align-items:center;gap:.35rem;margin:0 auto;padding:0;list-style:none}.pagination-step,.pagination-page{display:inline-grid;place-items:center;min-width:2.1rem;height:2.1rem;padding:0 .75em;border:1px solid var(--rule);border-radius:999px;color:var(--muted);white-space:nowrap;transition:color .15s ease,border-color .15s ease,background .15s ease}.pagination-step:hover,.pagination-page:hover{color:var(--text);border-color:var(--rule-strong)}.pagination-step.is-off{color:var(--faint);border-color:transparent}.pagination-page.is-current{color:var(--accent);border-color:transparent;background:var(--accent-soft);font-weight:600}.pagination-gap{color:var(--faint);padding:0 .2rem}.page{max-width:var(--measure);margin:0 auto;padding:3.5rem 0 0}.page h1{font-size:2rem;margin:0 0 1.5rem}.page-body{color:var(--text-soft)}.page-body p{line-height:1.9}.page-body h2{font-size:1.25rem;margin:2.5rem 0 .75rem;color:var(--text)}.page-body code{font-family:var(--font-mono);font-size:.875em;background:var(--bg-soft);padding:.15em .4em;border-radius:3px}.page-body ul{padding-left:1.3rem}.page-body li{margin:.45rem 0;line-height:1.8}.skip-link{position:absolute;left:-9999px;top:.5rem;background:var(--bg);color:var(--text);padding:.5rem .9rem;border:1px solid var(--accent);border-radius:var(--radius);z-index:50}.skip-link:focus{left:1rem}@media(max-width:640px){body{font-size:16px}.site-header .wrap{gap:.9rem;height:3.25rem}.brand-en{display:none}.brand-zh{font-size:1.05rem}.nav{gap:.95rem;font-size:.8125rem}.theme-toggle{width:1.85rem;height:1.85rem;flex:none}.wrap{padding:0 1.15rem}.article-layout{padding-top:2rem}.home-hero{padding:2.5rem 0 1.75rem}.home-hero.is-slim{padding:2rem 0 1.25rem}.post-day-head{top:3.25rem}.footer-note,.powered-by{margin-left:0}.post-card{padding:1.75rem 0}.tag-cloud{gap:.5rem .9rem}.tag-cloud-item[data-level="4"]{font-size:1.5rem}.tag-cloud-item[data-level="5"]{font-size:1.85rem}}