:root{--paper:#fafaf7;--ink:#252821;--muted:#83877d;--line:#e2e4dc;--soft:#eff1e9;--accent:#809c39;--text-size:19px;color-scheme:light}
:root[data-theme=dark]{--paper:#1c1f1b;--ink:#dce0d5;--muted:#a0a698;--line:#363c31;--soft:#292f24;--accent:#b6cf7a;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit}button,input{font:inherit}button{cursor:pointer;color:inherit;background:transparent;border:1px solid var(--line);border-radius:6px;padding:7px 12px}button:hover{background:var(--soft)}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:4px}[hidden]{display:none!important}.skip{position:fixed;top:-80px;left:20px;z-index:20;background:var(--paper);padding:12px}.skip:focus{top:8px}
.reader-top{height:76px;position:sticky;top:0;z-index:5;border-bottom:1px solid var(--line);background:var(--paper);display:flex;align-items:center;justify-content:space-between;padding:0 max(28px,calc((100vw - 1600px)/2))}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;line-height:1.3}.brand-mark{display:grid;place-items:center;width:40px;height:44px;background:var(--ink);color:var(--paper);font:24px Georgia,serif}.brand strong{display:block;font-size:16px}.brand small{color:var(--muted);font-size:12px}.top-actions{display:flex;gap:10px}.progress{position:absolute;bottom:-1px;left:0;height:2px;background:var(--accent);width:0}
.reader-layout{max-width:1600px;margin:auto;display:grid;grid-template-columns:256px minmax(0,1fr) 222px;gap:clamp(28px,4vw,72px);padding:0 28px}.course-sidebar,.page-sidebar{position:sticky;top:76px;height:calc(100dvh - 76px);overflow:auto;scrollbar-width:thin;padding:32px 0 28px}.course-sidebar{border-right:1px solid var(--line);padding-right:24px}.sidebar-label{color:var(--muted);font-size:12px;letter-spacing:.12em;margin:24px 0 16px}.back-link{color:var(--muted);text-decoration:none;font-size:13px}.chapter-list{list-style:none;padding:0;margin:0}.chapter-list a{display:flex;align-items:baseline;gap:12px;text-decoration:none;padding:11px 10px;margin:3px 0;border-left:2px solid transparent;font-size:13px;line-height:1.65;border-radius:3px}.chapter-list a:hover{background:var(--soft)}.chapter-list a[aria-current=page]{background:var(--soft);border-left-color:var(--accent);font-weight:600}.chapter-number{color:var(--muted);font-size:12px;font-variant-numeric:tabular-nums}.sidebar-search{width:100%;border:1px solid var(--line);background:var(--paper);color:var(--ink);padding:8px 10px;border-radius:5px;font-size:13px}.reader-main{min-width:0;padding:36px 0 80px}.breadcrumb{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;gap:16px}.breadcrumb a{text-decoration:none}.article-header{margin:48px 0 26px}.chapter-kicker{font-size:12px;letter-spacing:.12em;display:flex;gap:12px;align-items:center;margin-bottom:24px}.chapter-kicker span{background:#d8ec8d;color:#344021;padding:4px 8px;letter-spacing:0;font-weight:600}.article-title{font-size:clamp(30px,3vw,46px);line-height:1.35;letter-spacing:-.035em;font-weight:650;margin:0 0 28px;text-wrap:pretty}.article-meta{color:var(--muted);font-size:12px}.reading-tools{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:22px;margin-bottom:26px;gap:12px;color:var(--muted)}.reading-tools .controls{display:flex;gap:8px;align-items:center}.reading-tools button{border:0;padding:5px 8px;font-size:13px}.size-controls{display:flex;align-items:center;gap:4px}.size-controls output{font-size:12px;min-width:35px;text-align:center}
#js_content{visibility:visible!important;opacity:1!important;user-select:text!important;-webkit-user-select:text!important;font-family:'Songti SC','Noto Serif CJK SC','STSong',Georgia,serif!important;font-size:var(--text-size)!important;line-height:1.95!important;color:var(--ink)!important;overflow-wrap:break-word}
#js_content *{visibility:visible!important;opacity:1!important;max-width:100%}#js_content section,#js_content span,#js_content p,#js_content li{font-family:inherit!important;font-size:inherit!important;line-height:inherit!important;color:inherit!important;letter-spacing:normal!important}#js_content section{width:auto!important;background-color:transparent!important}#js_content p{margin:0 0 1.2em!important;padding:0!important;text-align:start!important}#js_content>section{padding:0!important}#js_content h1,#js_content h2,#js_content h3,#js_content h4{font-family:-apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif!important;color:var(--ink)!important;line-height:1.5!important;margin:2.3em 0 1em!important;padding:0!important;scroll-margin-top:100px}#js_content h1,#js_content h2{font-size:1.4em!important}#js_content h3{font-size:1.17em!important}#js_content h4{font-size:1.05em!important}#js_content img{display:block;max-width:100%!important;height:auto!important;margin:24px auto;border-radius:4px;cursor:zoom-in}img:not([src]){display:none!important}#js_content pre{background:var(--soft)!important;color:var(--ink)!important;padding:18px!important;border:1px solid var(--line);border-radius:6px;overflow:auto!important;white-space:pre!important;font-size:13px!important;line-height:1.75!important}#js_content pre *{font-family:ui-monospace,SFMono-Regular,Menlo,monospace!important;font-size:inherit!important;color:inherit!important;white-space:pre!important}#js_content code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace!important;font-size:.85em!important}#js_content blockquote{background:var(--soft)!important;border-left:2px solid var(--accent)!important;margin:28px 0!important;padding:18px 22px!important;color:var(--ink)!important}#js_content table{display:block;overflow:auto;border-collapse:collapse;font-size:.85em}#js_content td,#js_content th{border:1px solid var(--line);padding:8px 12px}#js_content a{color:var(--accent)!important;text-underline-offset:4px}.offline-video{background:var(--soft);border-left:2px solid var(--accent);padding:14px;color:var(--muted);font:13px/1.7 sans-serif}
.page-sidebar .sidebar-label{margin-top:6px}.page-toc{border-left:1px solid var(--line)}.page-toc a{display:block;border-left:2px solid transparent;margin-left:-1px;padding:6px 0 6px 16px;color:var(--muted);font-size:12px;text-decoration:none;line-height:1.7}.page-toc a[data-level='3']{padding-left:26px}.page-toc a.active{border-left-color:var(--accent);color:var(--ink)}.to-top{display:inline-block;margin:26px 0 0 16px;text-decoration:none;color:var(--muted);font-size:12px}.article-nav{display:flex;gap:16px;border-top:1px solid var(--line);margin-top:52px;padding-top:24px}.article-nav a,.nav-slot{flex:1;min-width:0;text-decoration:none;padding:14px;background:var(--soft);border-radius:4px;display:flex;flex-direction:column;gap:8px}.nav-label{font-size:12px;color:var(--muted)}.nav-title{font-size:13px}.nav-next{text-align:right}.nav-slot{background:none}.focus-mode .course-sidebar,.focus-mode .page-sidebar{display:none}.focus-mode .reader-layout{display:block;max-width:820px}.mobile-menu{display:none}.resume-note{display:flex;gap:12px;align-items:center;margin-top:20px;padding:10px 14px;background:var(--soft);font-size:12px}.image-viewer{width:min(95vw,1500px);max-width:95vw;max-height:95dvh;border:1px solid var(--line);background:var(--paper);color:var(--ink);padding:16px}.image-viewer::backdrop{background:#000b}.image-viewer img{display:block;max-width:100%;max-height:80dvh;object-fit:contain;margin:12px auto}.image-viewer button{display:block;margin-left:auto}
/* Library */
.library{max-width:1000px;margin:0 auto;padding:64px 28px 100px}.library .eyebrow{color:var(--accent);font-size:12px;letter-spacing:.15em}.album-title{font-size:clamp(30px,4vw,46px);line-height:1.4;max-width:800px;letter-spacing:-.035em;margin:18px 0}.library-description{color:var(--muted);font-size:14px}.toolbar{position:sticky;top:76px;z-index:2;background:var(--paper);display:flex;gap:12px;padding:20px 0;border-bottom:1px solid var(--line);margin-top:30px}.toolbar input{flex:1;min-width:0;padding:10px 14px;border:1px solid var(--line);border-radius:6px;background:var(--paper);color:var(--ink)}.result-count{font-size:12px;color:var(--muted);margin:20px 0}.entries{list-style:none;margin:0;padding:0}.entry{border-bottom:1px solid var(--line)}.entry a{display:flex;gap:24px;padding:20px 12px;align-items:baseline;text-decoration:none}.entry a:hover{background:var(--soft)}.entry .num{color:var(--accent);font:14px Georgia,serif}.entry .title{flex:1}.entry a:after{content:'↗';color:var(--muted)}.empty{display:none;padding:40px;text-align:center;color:var(--muted)}.empty-state .empty{display:block}.continue-reading{margin-top:28px;padding:20px 24px;background:var(--soft);border-left:2px solid var(--accent);text-decoration:none;display:block}.continue-reading small{display:block;color:var(--muted);margin-bottom:6px}
@media(min-width:1700px){.reader-layout{gap:88px}}@media(max-width:1200px){.reader-layout{grid-template-columns:220px minmax(0,1fr);gap:40px;max-width:1120px}.page-sidebar{display:none}}@media(max-width:800px){.reader-top{height:64px;padding:0 20px}.mobile-menu{display:inline-block}.reader-layout{display:block;padding:0 24px;max-width:760px}.reader-main{padding-top:24px}.course-sidebar{display:none;position:fixed;left:0;top:64px;width:min(85vw,340px);height:calc(100dvh - 64px);background:var(--paper);z-index:6;padding:24px;box-shadow:20px 0 60px #0002}.menu-open .course-sidebar{display:block}.article-header{margin-top:32px}.article-title{font-size:30px;margin-bottom:20px}.reading-tools{align-items:flex-start;flex-wrap:wrap}.reading-tools .controls{margin-left:auto}.article-nav{gap:8px}.article-nav a{padding:12px 8px}.library{padding:36px 24px 70px}.toolbar{top:64px}.brand small{font-size:11px}.brand strong{font-size:14px}.top-actions{gap:6px}.top-actions button{padding:6px 10px}:root{--text-size:18px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

#js_content ul,#js_content ol,#js_content li,#js_content figure,#js_content div,#js_content strong,#js_content em{color:inherit!important;background-color:transparent!important}#js_content ul,#js_content ol{font-size:inherit!important;line-height:inherit!important;padding-left:1.4em!important;margin:0 0 1.2em!important}#js_content li p{margin-bottom:.4em!important}:root[data-theme=dark] #js_content span{background-color:transparent!important}

/* WeChat puts a second, fixed dark background on the code inside pre. */
#js_content pre { box-shadow: none !important; }
#js_content pre code {
  display: block !important;
  background: transparent !important;
  color: var(--ink) !important;
  padding: 0 !important;
  border-radius: 0 !important;
  font-size: inherit !important;
  line-height: inherit !important;
}
#js_content pre code * { background: transparent !important; }

/* Theme-aware syntax colors, using the source article's existing tokens. */
:root {
  --syntax-keyword: #8250a8;
  --syntax-string: #39702c;
  --syntax-number: #9a5219;
  --syntax-function: #245fa0;
  --syntax-comment: #6b7464;
  --syntax-property: #a23b4d;
  --syntax-type: #18736f;
  --scroll-thumb: #c5c9bd;
  --scroll-hover: #a2aa96;
}
:root[data-theme=dark] {
  --syntax-keyword: #c792ea;
  --syntax-string: #a4ce83;
  --syntax-number: #e4ac78;
  --syntax-function: #82b6f0;
  --syntax-comment: #9ba58e;
  --syntax-property: #ed929d;
  --syntax-type: #79c9bd;
  --scroll-thumb: #485140;
  --scroll-hover: #69755c;
}
#js_content pre [data-token=keyword] { color: var(--syntax-keyword) !important; }
#js_content pre [data-token=string] { color: var(--syntax-string) !important; }
#js_content pre [data-token=number] { color: var(--syntax-number) !important; }
#js_content pre [data-token=function] { color: var(--syntax-function) !important; }
#js_content pre [data-token=comment] { color: var(--syntax-comment) !important; }
#js_content pre [data-token=property] { color: var(--syntax-property) !important; }
#js_content pre [data-token=type] { color: var(--syntax-type) !important; }
/* Scroll the code block as one surface, without an inner native code track. */
#js_content pre code { overflow: visible !important; }
* { scrollbar-width: thin; scrollbar-color: var(--scroll-thumb) transparent; }
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scroll-thumb); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: var(--scroll-hover); }
::-webkit-scrollbar-corner { background: transparent; }
/* Use the reader's typography instead of imported mdnice title decorations. */
#js_content p,
#js_content p span {
  background: transparent !important;
}
#js_content :is(h1, h2, h3, h4) {
  display: block !important;
  background: none !important;
  text-align: left !important;
  border: 0 !important;
  height: auto !important;
  box-shadow: none !important;
}
#js_content :is(h1, h2, h3, h4) span {
  margin: 0 !important;
  padding: 0 !important;
  height: auto !important;
  background: transparent !important;
  text-align: inherit !important;
}