:root { --bg:#f4f1e9; --panel:#ebe7dc; --paper:#fffdf7; --ink:#18211d; --muted:#657068; --line:#d8d4c8; --accent:#cf5c36; --green:#173f35; color-scheme:light; }
:root[data-dark] { --bg:#111714; --panel:#18201c; --paper:#1d2621; --ink:#edf1e8; --muted:#a5afa7; --line:#344039; --accent:#f07b53; --green:#d4e8df; color-scheme:dark; }
* { box-sizing:border-box; }
html,body { margin:0; min-height:100%; }
body { background:var(--bg); color:var(--ink); font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif; }
a { color:inherit; }
.topbar { height:64px; padding:0 24px; display:flex; align-items:center; justify-content:space-between; border-bottom:1px solid var(--line); background:color-mix(in srgb,var(--bg) 92%,transparent); position:sticky; top:0; z-index:20; backdrop-filter:blur(14px); }
.brand { text-decoration:none; font-family:Georgia,serif; font-weight:800; font-size:20px; letter-spacing:-.03em; }.brand span{color:var(--accent)}
.icon-button { width:38px;height:38px;border:1px solid var(--line);border-radius:50%;background:transparent;color:var(--ink);cursor:pointer;font-size:19px; }
.back-link{font-size:13px;font-weight:700;color:var(--muted);text-decoration:none}.back-link:hover{color:var(--accent)}
.article-tools{display:flex;align-items:center;justify-content:flex-end;gap:8px}.page-search{display:flex;align-items:center;position:relative}.page-search input{width:220px;padding:8px 10px;border:1px solid var(--line);border-right:0;border-radius:8px 0 0 8px;background:var(--paper);color:var(--ink);font:12px system-ui;outline:none}.page-search input:focus{border-color:var(--accent)}.page-search button,.chapter-toggle{padding:8px 9px;border:1px solid var(--line);background:var(--paper);color:var(--ink);font:700 12px system-ui;cursor:pointer}.page-search button+button{border-left:0}.page-search .search-next{border-radius:0 8px 8px 0}.chapter-toggle{border-radius:8px;font-size:11px}.page-search button:hover,.chapter-toggle:hover{border-color:var(--accent);color:var(--accent)}.search-status{min-width:38px;margin-left:6px;color:var(--muted);font:700 10px system-ui;text-align:center}.search-hit{background:#ffe08a;color:#382b00;border-radius:2px;padding:0 1px}.search-hit.active{background:#ff9f43;color:#241300;outline:2px solid color-mix(in srgb,#ff9f43 38%,transparent);outline-offset:1px}
.language-switch{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--paper)}.language-switch button{border:0;background:transparent;color:var(--muted);padding:8px 9px;font:800 10px system-ui;cursor:pointer}.language-switch button+button{border-left:1px solid var(--line)}.language-switch button.active{background:var(--green);color:var(--paper)}.language-switch[hidden],.language-version[hidden],.toc-language[hidden]{display:none!important}
.back-to-top{position:fixed;right:28px;bottom:28px;z-index:30;width:46px;height:46px;border:1px solid color-mix(in srgb,var(--green) 72%,white);border-radius:50%;background:var(--green);color:var(--paper);font:700 23px/1 system-ui;box-shadow:0 10px 28px rgba(12,35,29,.24);cursor:pointer;opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .2s,transform .2s,visibility .2s}.back-to-top.visible{opacity:1;visibility:visible;transform:translateY(0)}.back-to-top:hover{background:var(--accent);border-color:var(--accent)}.back-to-top:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 45%,transparent);outline-offset:3px}
.shell { display:grid;grid-template-columns:330px minmax(0,1fr);height:calc(100vh - 64px); }
.shell > main { grid-column:2; }
.shell.nav-collapsed { grid-template-columns:0 minmax(0,1fr); }
.shell.nav-collapsed .library-panel { display:none; }
.library-panel { overflow:auto;padding:18px 14px;border-right:1px solid var(--line);background:var(--panel); }
.search span { display:block;font-size:11px;text-transform:uppercase;letter-spacing:.14em;font-weight:800;margin:0 0 8px 4px;color:var(--muted); }
.search input { width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:9px;background:var(--paper);color:var(--ink);font:inherit;outline:none; }.search input:focus{border-color:var(--accent)}
.nav-filter{display:block;margin-top:10px}.nav-filter>span{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.14em;font-weight:800;margin:0 0 8px 4px;color:var(--muted)}.filter-tags{display:flex;flex-wrap:wrap;gap:5px}.filter-tags button{padding:6px 8px;border:1px solid var(--line);border-radius:999px;background:var(--paper);color:var(--muted);font:750 10px/1 system-ui;cursor:pointer}.filter-tags button:hover{border-color:var(--accent);color:var(--accent)}.filter-tags button.active{border-color:var(--green);background:var(--green);color:var(--paper)}.nav-label{margin:16px 4px 7px;font-size:11px;text-transform:uppercase;letter-spacing:.14em;font-weight:800;color:var(--muted)}
#categories { display:grid;gap:3px;margin:0 0 14px; }
.area-group{border:1px solid transparent;border-radius:9px;overflow:hidden}.area-group[open]{border-color:var(--line);background:color-mix(in srgb,var(--paper) 48%,transparent)}.area-group>summary{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:8px;padding:8px 9px;color:var(--muted);cursor:pointer;font:650 12.5px/1.2 inherit;list-style:none}.area-group>summary::-webkit-details-marker{display:none}.area-group>summary:hover{background:color-mix(in srgb,var(--paper) 55%,transparent);color:var(--ink)}.area-group>summary b{min-width:22px;padding:2px 5px;border-radius:999px;background:color-mix(in srgb,var(--line) 55%,transparent);font-size:9px;text-align:center}.area-group>summary i{font-style:normal;font-size:15px;transition:transform .18s}.area-group[open]>summary{color:var(--ink);border-bottom:1px solid var(--line)}.area-group[open]>summary i{transform:rotate(180deg)}.area-content{padding:4px 5px 7px}
.result-count { margin:12px 4px 6px;color:var(--muted);font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.1em; }
.article-list { display:grid;gap:4px; }.article-card{display:grid;gap:3px;padding:10px 11px;border-radius:9px;text-decoration:none;border:1px solid transparent}.article-card:hover,.article-card.active{background:var(--paper);border-color:var(--line)}.article-card strong{font-family:Georgia,serif;line-height:1.18}.article-card span{font-size:10px;color:var(--muted)}
.topic-group{margin:4px 0 6px;border:1px solid var(--line);border-radius:7px;overflow:hidden;background:color-mix(in srgb,var(--paper) 58%,transparent)}.topic-group>summary{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:6px;padding:6px 7px;color:var(--muted);cursor:pointer;list-style:none;font:750 10px/1.2 system-ui;text-transform:uppercase;letter-spacing:.08em}.topic-group>summary::-webkit-details-marker{display:none}.topic-group>summary>b{font-size:9px}.topic-group>summary>i{font-style:normal;font-size:13px;transition:transform .18s}.topic-group[open]>summary{border-bottom:1px solid var(--line);color:var(--ink)}.topic-group[open]>summary>i{transform:rotate(180deg)}.topic-content{display:grid;gap:2px;padding:4px}
#main { overflow:auto;scroll-behavior:smooth; }
.standalone-main{min-height:calc(100vh - 64px);background:var(--bg)}
.welcome { min-height:auto;display:flex;flex-direction:column;justify-content:center;padding:clamp(42px,5vw,76px) clamp(32px,7vw,110px);background:radial-gradient(circle at 85% 20%,color-mix(in srgb,var(--accent) 13%,transparent),transparent 32%); }.eyebrow{text-transform:uppercase;letter-spacing:.17em;font-weight:800;font-size:11px;color:var(--accent)}.welcome h1{font:800 clamp(40px,5.5vw,76px)/.94 Georgia,serif;letter-spacing:-.055em;margin:12px 0 20px;max-width:760px}.welcome>p:not(.eyebrow){font-size:clamp(16px,1.5vw,20px);line-height:1.5;max-width:700px;color:var(--muted)}
.stats{display:flex;gap:36px;margin-top:26px}.stats div{display:grid}.stats strong{font:700 26px Georgia,serif}.stats span{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.1em}
.reader{max-width:1640px;margin:auto;padding:60px clamp(24px,4vw,64px) 100px}.reader-head{max-width:1080px;border-bottom:1px solid var(--line);padding-bottom:34px;margin-bottom:42px}.reader-head h1{font:800 clamp(40px,5vw,72px)/1 Georgia,serif;letter-spacing:-.045em;margin:12px 0 18px}.article-meta{color:var(--muted)}.reader-grid{display:grid;grid-template-columns:minmax(0,1080px) 240px;gap:48px;align-items:start}.article-content{font-family:Georgia,serif;font-size:18px;line-height:1.72;min-width:0}.article-content h1,.article-content h2,.article-content h3{scroll-margin-top:85px;line-height:1.15;letter-spacing:-.025em}.article-content h1{font-size:40px;margin:2em 0 .7em}.article-content h2{font-size:31px;margin:2em 0 .7em}.article-content h3{font-size:23px;margin:1.6em 0 .6em}.article-content img,.article-content svg{max-width:100%;height:auto}.article-content pre{position:relative;overflow:auto;margin:1.6em 0;background:linear-gradient(180deg,#fbfdff,#f7fafc);color:#26364d;border:1px solid #ccd8e6;border-radius:18px;padding:52px 18px 18px;line-height:1.5;font-size:13.2px;tab-size:4;box-shadow:inset 0 1px 0 rgba(255,255,255,.8)}.article-content pre::before{content:attr(data-lang);position:absolute;top:11px;left:16px;color:#475569;background:#eef4fb;border:1px solid #d7e2ee;border-radius:999px;padding:3px 9px;font:700 12px/1.4 ui-sans-serif,system-ui;letter-spacing:.05em;text-transform:uppercase}.article-content code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;font-size:.95em}.article-content :not(pre)>code{background:color-mix(in srgb,var(--accent) 12%,transparent);padding:.15em .35em;border-radius:4px}.copy{position:absolute;top:10px;right:12px;border:1px solid #c9d7e5;background:#fff;color:#233044;border-radius:10px;padding:7px 10px;cursor:pointer;font:600 12px ui-sans-serif,system-ui;box-shadow:0 4px 14px rgba(31,54,89,.08)}.copy:hover{background:#edf7ff}.tok-keyword{color:#7c3aed;font-weight:700}.tok-type{color:#0f6cbd;font-weight:650}.tok-string{color:#a84800}.tok-comment{color:#68798f;font-style:italic}.tok-number{color:#116329}.tok-annotation{color:#835c00;font-weight:650}.tok-constant{color:#0b7285;font-weight:650}.tok-method{color:#005a9e}.article-content table{display:block;overflow:auto;border-collapse:collapse;font-family:inherit;font-size:15px}.article-content th,.article-content td{padding:9px 12px;border:1px solid var(--line)}.article-content blockquote{margin:1.5em 0;padding:2px 20px;border-left:4px solid var(--accent);color:var(--muted)}
.toc{position:sticky;top:20px;overflow:visible;border-left:1px solid var(--line);padding-left:16px}.toc strong{display:block;font-size:10px;text-transform:uppercase;letter-spacing:.1em;margin-bottom:8px}.toc a{display:block;text-decoration:none;color:var(--muted);font-size:11px;line-height:1.22;margin:5px 0}.toc a:hover{color:var(--accent)}.toc-question{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:5px}.toc-question-language{display:flex;border:1px solid var(--line);border-radius:4px;overflow:hidden}.toc-question-language button{border:0;background:var(--paper);color:var(--muted);padding:2px 3px;font:800 7px/1 system-ui;cursor:pointer}.toc-question-language button+button{border-left:1px solid var(--line)}.toc-question-language button.active{background:var(--green);color:var(--paper)}.toc-level-2{padding-left:9px}.toc-level-3{padding-left:16px;font-size:10px}.loading,.empty{color:var(--muted)}
.chapter-section{margin:28px 0;border:1px solid var(--line);border-radius:14px;background:color-mix(in srgb,var(--paper) 48%,transparent);overflow:hidden}.chapter-section>summary{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:16px;padding:18px 20px;cursor:pointer;list-style:none;color:var(--ink);background:color-mix(in srgb,var(--paper) 78%,transparent)}.chapter-section>summary::-webkit-details-marker{display:none}.chapter-section>summary span{font:750 27px/1.15 Georgia,serif;letter-spacing:-.025em;scroll-margin-top:85px}.chapter-section>summary i{font:400 20px/1 system-ui;transition:transform .18s}.chapter-section[open]>summary{border-bottom:1px solid var(--line)}.chapter-section[open]>summary i{transform:rotate(180deg)}.chapter-content{padding:2px 20px 22px}.chapter-content>:first-child{margin-top:1.2em}
.content-category{margin:22px 0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:color-mix(in srgb,var(--paper) 52%,transparent)}.content-category>summary{display:grid;grid-template-columns:minmax(0,1fr) auto auto auto;align-items:center;gap:12px;padding:15px 17px;cursor:pointer;list-style:none;background:color-mix(in srgb,var(--paper) 82%,transparent)}.content-category>summary::-webkit-details-marker,.question-card>summary::-webkit-details-marker{display:none}.content-category-title{font:750 21px/1.2 Georgia,serif;scroll-margin-top:85px}.question-count{color:var(--muted);font:700 10px/1 system-ui;white-space:nowrap}.content-category>summary>i,.question-card>summary>i{font-style:normal;transition:transform .18s}.content-category[open]>summary{border-bottom:1px solid var(--line)}.content-category[open]>summary>i,.question-card[open]>summary>i{transform:rotate(180deg)}.content-category-body{display:grid;gap:8px;padding:12px}.content-language-switch{display:flex;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:var(--paper)}.content-language-switch button{border:0;background:transparent;color:var(--muted);padding:5px 7px;font:800 9px/1 system-ui;cursor:pointer}.content-language-switch button+button{border-left:1px solid var(--line)}.content-language-switch button.active{background:var(--green);color:var(--paper)}.question-card{border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--paper)}.question-card>summary{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:12px;padding:12px 14px;cursor:pointer;list-style:none}.question-card>summary:hover{color:var(--accent)}.question-card>summary span{font:700 15px/1.35 system-ui;scroll-margin-top:85px}.question-card[open]>summary{border-bottom:1px solid var(--line)}.question-content{padding:2px 16px 16px}.question-content>:first-child{margin-top:1em}
.question-card>summary{grid-template-columns:minmax(0,1fr) auto auto}.question-card>summary>[data-question-lang]{font:700 15px/1.35 system-ui;scroll-margin-top:85px}.question-language-switch{display:flex;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:var(--paper)}.question-language-switch button{border:0;background:transparent;color:var(--muted);padding:5px 7px;font:800 9px/1 system-ui;cursor:pointer}.question-language-switch button+button{border-left:1px solid var(--line)}.question-language-switch button.active{background:var(--green);color:var(--paper)}
.chapter-section>summary{grid-template-columns:minmax(0,1fr) auto auto}.chapter-section>summary>[data-chapter-lang]{font:750 27px/1.15 Georgia,serif;letter-spacing:-.025em;scroll-margin-top:85px}.chapter-language-switch{display:flex;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:var(--paper)}.chapter-language-switch button{border:0;background:transparent;color:var(--muted);padding:5px 7px;font:800 9px/1 system-ui;cursor:pointer}.chapter-language-switch button+button{border-left:1px solid var(--line)}.chapter-language-switch button.active{background:var(--green);color:var(--paper)}
.chapter-toggle span{display:inline-block;margin-right:4px;font-size:14px;line-height:0;vertical-align:-1px}
.section-close{display:block;width:34px;height:34px;margin:2px 14px 14px auto;border:1px solid var(--line);border-radius:50%;background:var(--paper);color:var(--muted);cursor:pointer;font:800 19px/30px system-ui}.section-close:hover{border-color:var(--accent);background:var(--accent);color:var(--paper)}.section-close:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 38%,transparent);outline-offset:2px}.section-close span{position:relative;top:2px}
.missing-media{margin:22px 0;padding:26px;border:1px dashed var(--line);border-radius:12px;background:color-mix(in srgb,var(--panel) 55%,transparent);color:var(--muted);text-align:center}.missing-media figcaption{font:650 13px/1.4 system-ui}
a[data-missing-anchor]{color:var(--muted);text-decoration:line-through dotted;cursor:not-allowed}
:root[data-dark] .article-content pre{background:linear-gradient(180deg,#17201b,#111814);color:#e2ebe5;border-color:#3b4941;box-shadow:inset 0 1px 0 rgba(255,255,255,.04)}:root[data-dark] .article-content pre::before{color:#bdc9c0;background:#253129;border-color:#435148}:root[data-dark] .copy{background:#253129;color:#e2ebe5;border-color:#435148}:root[data-dark] .copy:hover{background:#314039}:root[data-dark] .tok-keyword{color:#d2a8ff}:root[data-dark] .tok-type,:root[data-dark] .tok-method{color:#79c0ff}:root[data-dark] .tok-string{color:#ffa657}:root[data-dark] .tok-comment{color:#8b9a90}:root[data-dark] .tok-number{color:#7ee787}
@media(max-width:900px){.shell{grid-template-columns:1fr;height:auto}.library-panel{position:relative;border-right:0;border-bottom:1px solid var(--line);max-height:430px}.reader-grid{grid-template-columns:1fr}.toc{display:none}.welcome{min-height:auto;padding-block:38px}.reader{padding-top:40px}.article-tools{gap:5px}.page-search input{width:150px}.back-link{display:none}.chapter-section>summary span{font-size:22px}}
@media(max-width:620px){.topbar{padding-inline:12px}.brand span{display:none}.page-search input{width:108px}.page-search button{padding-inline:7px}.search-status{position:absolute;right:0;top:36px;min-width:auto;padding:2px 5px;border-radius:4px;background:var(--paper)}.chapter-toggle{display:none}.content-category>summary{grid-template-columns:minmax(0,1fr) auto auto}.question-count{display:none}.content-category-title{font-size:18px}}
#reader-grid.toc-collapsed { grid-template-columns:minmax(0,1fr) !important; }
#reader-grid.toc-collapsed .article-content { max-width:none; }
#reader-grid.toc-collapsed .toc { display:none; }
.notes-widget { margin:18px 0 0; padding:.9rem 1rem; border:1px solid var(--line); border-radius:10px; background:color-mix(in srgb,var(--paper) 60%,transparent); max-width:1080px; }
.notes-widget label { display:block; font-size:11px; text-transform:uppercase; letter-spacing:.1em; font-weight:800; color:var(--muted); margin:0 0 6px; }
.notes-textarea { width:100%; box-sizing:border-box; resize:vertical; padding:.5rem .7rem; border:1px solid var(--line); border-radius:6px; background:var(--paper); color:var(--ink); font:inherit; font-size:14px; }
.notes-textarea:focus { outline:none; border-color:var(--accent); }