:root { --ink:#202124; --muted:#5c616b; --paper:#fff; --ground:#fff; --rail:#f3f5f7; --line:#dfe3e8; --blue:#125bc7; --wash:#edf3fc; --rail-width:254px; }
* { box-sizing:border-box; letter-spacing:0; }
html { scroll-padding-top:100px; }
body { margin:0; background:var(--ground); color:var(--ink); font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif; }
a { color:inherit; text-decoration:none; }
button,input,select,textarea { font:inherit; }
button,summary { cursor:pointer; }
button,input,select { border-radius:6px; }
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,textarea:focus-visible { outline:3px solid #125bc7; outline-offset:3px; }
[hidden] { display:none!important; }
::selection { background:#d9e8ff; }
.skip { position:fixed; left:16px; top:-100px; z-index:100; background:var(--ink); color:white; padding:12px 18px; }
.skip:focus { top:12px; }
.sidebar { position:fixed; inset:0 auto 0 0; width:var(--rail-width); padding:32px 20px; border-right:1px solid var(--line); background:var(--rail); display:flex; flex-direction:column; overflow-y:auto; }
.brand { display:flex; align-items:center; gap:12px; font-size:21px; font-weight:700; line-height:1.2; }
.brand-mark { width:48px; height:48px; flex-shrink:0; object-fit:contain; }
.brand-sub { display:block; }
.rail-label { display:block; margin:24px 12px 10px; color:var(--muted); font-size:12px; }
.nav-link { display:flex; align-items:center; justify-content:space-between; gap:8px; min-height:42px; padding:8px 12px; margin-bottom:2px; font-size:14px; border-radius:6px; }
.nav-link:hover { background:#e8ebef; }
.nav-link[aria-current] { color:var(--blue); background:var(--paper); font-weight:600; box-shadow:inset 3px 0 var(--blue); }
.nav-count { color:var(--muted); font-size:12px; font-weight:400; font-variant-numeric:tabular-nums; }
.rail-bottom { margin-top:auto; padding:36px 12px 0; font-size:12px; color:var(--muted); }
.rail-bottom span,.rail-bottom a { display:block; }
.rail-bottom a:hover { color:var(--blue); }
.workspace { margin-left:var(--rail-width); }
.topbar { position:sticky; top:0; z-index:30; min-height:76px; padding:14px 40px; display:flex; align-items:center; justify-content:space-between; gap:24px; border-bottom:1px solid var(--line); background:var(--paper); }
.text-link { color:var(--blue); font-size:14px; }
.text-link:hover { text-decoration:underline; }
.global-search { display:flex; width:340px; max-width:100%; border:1px solid var(--line); border-radius:6px; background:var(--rail); }
.global-search input { min-width:0; flex:1; width:100%; padding:10px 12px; border:0; background:transparent; color:var(--ink); font-size:14px; }
.icon-button { display:inline-flex; align-items:center; justify-content:center; width:44px; height:44px; flex-shrink:0; border:0; background:transparent; }
.icon-button:hover { background:#e0e7f1; }
.icon-button img { width:18px; height:18px; }
#main { max-width:1440px; min-height:calc(100vh - 162px); padding:40px 40px 64px; margin:0 auto; }
h1 { font-size:36px; line-height:1.2; margin:0 0 18px; font-weight:700; overflow-wrap:anywhere; }
h2 { font-size:24px; line-height:1.3; margin:0 0 16px; }
.eyebrow { color:var(--muted); font-size:13px; margin:0 0 14px; }
.intro { color:var(--muted); max-width:65ch; margin:0; font-size:16px; }
.library-heading { padding-bottom:28px; border-bottom:1px solid var(--line); }
.library-heading h1 { font-size:40px; }
.library-stats { display:flex; gap:32px; flex-wrap:wrap; margin-top:24px; color:var(--muted); font-size:13px; }
.library-stats strong { color:var(--ink); font-size:17px; padding-right:5px; }
.chapter-part { margin-top:30px; }
.section-title { display:flex; align-items:baseline; justify-content:space-between; gap:16px; }
.section-title h2 { margin:0; }
.section-heading { margin-bottom:24px; }
.material-list { display:flex; flex-direction:column; }
.material-row { display:grid; grid-template-columns:110px minmax(0,1fr) 20px; align-items:start; gap:16px; padding:22px 0; border-bottom:1px solid var(--line); }
.material-row:hover .row-title { color:var(--blue); }
.row-kind { color:var(--muted); font-size:12px; padding-top:3px; overflow-wrap:anywhere; }
.row-title { font-size:16px; font-weight:600; line-height:1.5; }
.row-description { color:var(--muted); font-size:14px; line-height:1.6; margin:6px 0 0; max-width:80ch; }
.row-meta { color:var(--muted); font-size:12px; margin-top:7px; }
.row-arrow { margin-top:4px; opacity:.55; }
#article-results .material-row { grid-template-columns:minmax(0,1fr); }
.path-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); column-gap:32px; }
.path-row { display:flex; justify-content:space-between; align-items:center; gap:16px; padding:18px 0; border-bottom:1px solid var(--line); }
.path-row:hover { color:var(--blue); }
.path-row span { color:var(--muted); font-size:13px; }
.path-row small { display:block; color:var(--muted); font-size:13px; margin-top:4px; }
.path-steps { padding:0; list-style:none; margin:28px 0; }
.path-steps li { display:grid; grid-template-columns:36px minmax(0,1fr); gap:16px; padding:24px 0; border-bottom:1px solid var(--line); }
.path-steps h2 { font-size:21px; margin-bottom:8px; }
.path-steps .text-link { display:inline-block; margin-top:12px; }
.step-number { color:var(--blue); font-size:13px; padding-top:3px; }
.update { display:grid; grid-template-columns:110px minmax(0,1fr); gap:24px; border-bottom:1px solid var(--line); padding:28px 0; }
.update time { color:var(--muted); font-size:13px; }
.update h2 { font-size:22px; }
.update p { max-width:75ch; }
.save-button { display:inline-flex; align-items:center; gap:8px; padding:8px 12px; margin-left:auto; min-height:44px; border:1px solid #b8c0ca; background:white; color:var(--blue); font-size:13px; }
.save-button[aria-pressed="true"] { background:var(--wash); }
.save-button:hover { background:var(--wash); }
.related { border-top:1px solid var(--line); margin-top:32px; padding-top:24px; }
.prose .related .material-row { grid-template-columns:minmax(0,1fr) 20px; }
.prose .related .row-kind,.prose .related .row-content { grid-column:1; }
.prose .related .row-arrow { grid-column:2; grid-row:1/3; }
.prose .related a { text-decoration:none; }
.saved-item { position:relative; }
.saved-item .material-row { padding-right:56px; }
.saved-remove { position:absolute; right:0; top:20px; border:1px solid var(--line); }
.catalog-controls,.search-controls { display:grid; grid-template-columns:minmax(0,1fr) 210px; gap:16px; align-items:end; }
.catalog-controls label,.search-controls label { display:block; font-size:13px; color:var(--muted); min-width:0; }
.catalog-controls input,.catalog-controls select,.search-controls input,.search-controls select { display:block; width:100%; height:44px; padding:9px 12px; margin-top:6px; border:1px solid #b8c0ca; background:white; color:var(--ink); font-size:14px; }
.search-controls { margin:28px 0 24px; grid-template-columns:minmax(0,1fr) minmax(130px,180px) minmax(150px,200px) 44px; }
.search-submit { border:1px solid #b8c0ca; background:var(--rail); }
.result-count { font-size:13px; color:var(--muted); margin:20px 0 0; }
.empty { padding:36px 0; color:var(--muted); }
.breadcrumb { display:flex; gap:9px; flex-wrap:wrap; margin-bottom:20px; color:var(--muted); font-size:13px; }
.breadcrumb a:hover { color:var(--blue); }
.material-header { max-width:900px; }
.material-head-meta { display:flex; gap:16px; align-items:center; flex-wrap:wrap; margin:22px 0 28px; color:var(--muted); font-size:12px; }
.badge { background:#edf0f3; padding:5px 8px; border-radius:4px; }
.article-layout { display:grid; grid-template-columns:minmax(0,76ch) minmax(180px,1fr); gap:40px; border-top:1px solid var(--line); padding-top:28px; align-items:start; }
.prose { min-width:0; max-width:76ch; font-size:16px; line-height:1.8; overflow-wrap:anywhere; }
.prose > :first-child { margin-top:0; }
.prose p { margin:16px 0; }
.prose h2 { font-size:24px; margin:36px 0 14px; }
.prose h3 { font-size:20px; margin:28px 0 12px; }
.prose li { margin:8px 0; }
.prose ul,.prose ol { padding-left:24px; }
.prose a { color:var(--blue); text-decoration:underline; text-underline-offset:3px; }
.prose img { max-width:100%; height:auto; border-radius:6px; }
.prose .article-image { display:block; width:fit-content; max-width:100%; cursor:zoom-in; }
.prose blockquote { border-left:3px solid #b8c8df; padding-left:20px; margin:24px 0; color:var(--muted); }
.prose hr { border:0; border-top:1px solid var(--line); margin:28px 0; }
.prose :not(pre) > code { font:13px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace; background:var(--rail); padding:2px 4px; border-radius:3px; }
.prose table { display:block; width:100%; overflow-x:auto; border-collapse:collapse; font-size:14px; margin:24px 0; }
.prose th,.prose td { padding:12px; min-width:130px; border-bottom:1px solid var(--line); text-align:left; }
.prose th { background:var(--rail); }
.article-toc { position:sticky; top:104px; font-size:13px; max-height:calc(100vh - 140px); overflow-y:auto; padding-left:20px; border-left:1px solid var(--line); }
.article-toc summary { font-weight:600; margin-bottom:12px; }
.article-toc a { display:block; color:var(--muted); padding:6px 0; line-height:1.5; }
.article-toc a:hover { color:var(--blue); }
.article-toc .toc-h3 { padding-left:12px; }
.code-box { margin:24px 0; border:1px solid #d6dce5; background:#f5f7fa; border-radius:6px; overflow:hidden; }
.code-top { display:flex; justify-content:space-between; align-items:center; gap:12px; padding:8px 12px; border-bottom:1px solid #d6dce5; font-size:12px; color:var(--muted); }
.copy { min-width:130px; min-height:40px; padding:8px 12px 8px 34px; border:0; background:white url('assets/icons/copy.svg') no-repeat 10px center / 16px; color:var(--blue); font-size:13px; }
.copy:hover { background-color:#e6effd; }
.copy:disabled { opacity:.6; cursor:wait; }
.code-box pre { margin:0; padding:18px; white-space:pre-wrap; overflow-wrap:anywhere; overflow:auto; font:13px/1.75 ui-monospace,SFMono-Regular,Consolas,monospace; }
.manual-copy { padding:0 16px 16px; }
.manual-copy label { display:block; font-size:13px; }
.manual-copy textarea { display:block; width:100%; min-height:160px; margin-top:8px; padding:12px; border:1px solid #b8c0ca; background:white; resize:vertical; font:13px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace; }
.footer { display:flex; justify-content:space-between; gap:16px; padding:24px 0; margin:0 40px; border-top:1px solid var(--line); font-size:12px; color:var(--muted); }
.footer a:hover { color:var(--blue); }
.toast { position:fixed; bottom:24px; left:50%; transform:translateX(-50%); z-index:70; background:#202124; color:white; padding:12px 18px; border-radius:6px; font-size:13px; max-width:90vw; opacity:0; pointer-events:none; }
.toast.show { opacity:1; }
.mobile-navigation,.mobile-brand { display:none; }
@media (max-width:1180px) {
  .article-layout { grid-template-columns:minmax(0,1fr); gap:24px; }
  .article-toc { position:static; grid-row:1; max-height:none; padding:12px 0 16px; border-left:0; border-bottom:1px solid var(--line); }
  .article-toc nav { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:0 20px; }
}
@media (max-width:800px) {
  .sidebar,.home-link { display:none; }
  .workspace { margin-left:0; }
  .topbar { padding:14px 20px; display:grid; grid-template-columns:minmax(0,1fr) auto; gap:12px; }
  .mobile-brand { display:flex; font-size:17px; gap:8px; }
  .mobile-brand .brand-mark { width:38px; height:38px; }
  .global-search { grid-column:1/-1; width:100%; }
  .mobile-navigation { display:block; }
  .mobile-navigation summary { min-height:44px; padding:10px 0; color:var(--blue); font-size:14px; }
  .mobile-navigation nav { position:absolute; top:100%; left:0; right:0; max-height:calc(100dvh - 146px); overflow-y:auto; padding:12px 20px; border-bottom:1px solid var(--line); background:var(--paper); box-shadow:0 8px 16px #0000000d; }
  html { scroll-padding-top:156px; }
  #main { padding:28px 24px 48px; }
  h1,.library-heading h1 { font-size:30px; }
  .library-stats { gap:20px; }
  .material-row { grid-template-columns:minmax(0,1fr) 20px; gap:4px 12px; }
  .row-kind,.row-content { grid-column:1; }
  .row-arrow { grid-column:2; grid-row:1/3; }
  .catalog-controls { grid-template-columns:minmax(0,1fr); }
  .search-controls { grid-template-columns:minmax(0,1fr) 44px; }
  .search-controls label:first-child { grid-column:1/-1; }
  .search-controls label:nth-child(2),.search-controls label:nth-child(3) { grid-column:1; }
  .search-submit { grid-column:2; grid-row:3; }
  .search-submit { grid-column:2; }
  .footer { margin:0 24px; }
  .update { grid-template-columns:minmax(0,1fr); gap:8px; }
  .save-button { margin-left:0; }
  .mobile-navigation .nav-link { min-height:44px; }
}
@media (max-width:480px) {
  #main { padding-right:20px; padding-left:20px; }
  .path-list,.article-toc nav { grid-template-columns:minmax(0,1fr); }
  .section-title { align-items:start; }
  .section-title h2 { font-size:22px; }
  .section-title .text-link { font-size:13px; white-space:nowrap; }
  .material-head-meta { gap:8px 12px; }
  .code-box pre { padding:14px; font-size:12px; }
  .footer { flex-direction:column; margin:0 20px; }
}
@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto; }
  *,*::before,*::after { animation:none!important; transition:none!important; }
}