:root {
  --sidebar-w: 250px;
  --content-max: 720px;
  --accent: #A855F7;
  --accent-soft: rgba(168,85,247,0.06);
  --accent-mid: rgba(168,85,247,0.12);
  --accent-text: #7C3AED;
  --callout-info: #3B82F6;
  --callout-warn: #F59E0B;
  --callout-tip: #10B981;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  --radius: 10px;
  --radius-sm: 6px;
  --radius-pill: 4px;
}

[data-theme="dark"] {
  --page-bg: #1A1D28;
  --page-texture: repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(255,255,255,0.01) 40px, rgba(255,255,255,0.01) 41px);
  --sidebar-bg: #141621;
  --sidebar-surface: #1E212E;
  --sidebar-border: rgba(255,255,255,0.08);
  --sidebar-text: rgba(255,255,255,0.65);
  --sidebar-text-hover: rgba(255,255,255,0.85);
  --sidebar-text-active: #ffffff;
  --sidebar-hover: rgba(168,85,247,0.08);
  --sidebar-active: rgba(168,85,247,0.15);
  --text: #ECECF0;
  --text-secondary: #A0A3B1;
  --text-muted: #838696;
  --border: rgba(255,255,255,0.1);
  --border-light: rgba(255,255,255,0.06);
  --card-bg: #222532;
  --surface: #1E212E;
  --code-bg: #0C0F15;
  --code-border: rgba(255,255,255,0.06);
  --code-text: #E3E5EB;
  --sa-bg: rgba(255,255,255,0.04);
  --sa-border: rgba(255,255,255,0.08);
  --sa-hover: rgba(255,255,255,0.08);
  --sa-text: rgba(255,255,255,0.5);
  --sa-text-hover: rgba(255,255,255,0.8);
  --accent-soft: rgba(168,85,247,0.12);
  --accent-mid: rgba(168,85,247,0.2);
  --accent-text: #A78BFA;
  --callout-info: #60A5FA;
  --callout-warn: #FBBF24;
  --callout-tip: #34D399;
}

[data-theme="light"] {
  --page-bg: #F6F5F1;
  --page-texture: repeating-linear-gradient(0deg, transparent, transparent 40px, rgba(0,0,0,0.012) 40px, rgba(0,0,0,0.012) 41px);
  --sidebar-bg: #EDECE6;
  --sidebar-surface: #E6E5DE;
  --sidebar-border: rgba(0,0,0,0.06);
  --sidebar-text: rgba(0,0,0,0.55);
  --sidebar-text-hover: rgba(0,0,0,0.8);
  --sidebar-text-active: #1A1A2E;
  --sidebar-hover: rgba(168,85,247,0.04);
  --sidebar-active: rgba(168,85,247,0.1);
  --text: #1A1A2E;
  --text-secondary: #5B6770;
  --text-muted: #787C85;
  --border: #D6D5CE;
  --border-light: #E2E1DA;
  --card-bg: #ffffff;
  --surface: #EEEDE8;
  --code-bg: #FFFFFF;
  --code-border: #D6D5CE;
  --code-text: #1A1A2E;
  --sa-bg: rgba(0,0,0,0.03);
  --sa-border: rgba(0,0,0,0.06);
  --sa-hover: rgba(0,0,0,0.06);
  --sa-text: rgba(0,0,0,0.45);
  --sa-text-hover: rgba(0,0,0,0.7);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
html{background:var(--page-bg)}
body{
  background:var(--page-bg);
  background-image:var(--page-texture);
  color:var(--text);
  font-family:var(--font);
  font-size:15px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}

::selection{background:var(--accent);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:2px}

/* ─── Sidebar ─── */
.sidebar{
  position:fixed;left:0;top:0;bottom:0;width:var(--sidebar-w);
  background:var(--sidebar-bg);
  z-index:100;
  display:flex;flex-direction:column;
}

.sidebar-header{
  flex-shrink:0;
  background:var(--sidebar-surface);
  border-bottom:1px solid var(--sidebar-border);
}
.sidebar-brand{
  display:flex;align-items:center;gap:9px;
  padding:16px 16px 10px;
  text-decoration:none;
}
.logo-mark{
  width:24px;height:24px;border-radius:5px;
  background:linear-gradient(135deg,var(--accent),#6D28D9);
  display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:700;color:#fff;
  flex-shrink:0;
}
.logo-text{
  font-size:14px;font-weight:600;
  color:#fff;letter-spacing:-0.02em;
}
[data-theme="light"] .logo-text{color:var(--text)}
[data-theme="light"] .logo-mark{color:#fff}

.sidebar-search{
  position:relative;
  margin:0 12px 6px;
}
.sidebar-search .search-icon{
  position:absolute;left:9px;top:50%;transform:translateY(-50%);
  color:var(--sidebar-text);pointer-events:none;
}
.sidebar-search input{
  width:100%;
  padding:6px 8px 6px 30px;
  border-radius:5px;
  border:1px solid var(--sidebar-border);
  background:var(--sa-bg);
  color:var(--text);
  font-family:var(--font);
  font-size:12.5px;
  outline:none;
  transition:border-color .12s, background .12s;
}
.sidebar-search input::placeholder{color:var(--sidebar-text)}
.sidebar-search input:focus{
  border-color:rgba(168,85,247,0.25);
  background:rgba(168,85,247,0.04);
}

.sidebar-actions{
  display:flex;gap:4px;
  padding:0 12px 10px;
}
.sa-btn{
  display:flex;align-items:center;gap:4px;
  padding:4px 8px;
  border-radius:4px;
  border:1px solid var(--sa-border);
  background:var(--sa-bg);
  color:var(--sa-text);
  text-decoration:none;
  font-family:var(--font);
  font-size:10.5px;font-weight:500;
  cursor:pointer;
  transition:all .12s;
  line-height:1;
  flex:1;justify-content:center;
}
.sa-btn:hover{
  background:var(--sa-hover);
  color:var(--sa-text-hover);
  border-color:var(--sa-border);
}
.sa-btn svg{flex-shrink:0}
.sa-btn span{white-space:nowrap}

.theme-btn{
  flex:0 0 auto;
  padding:4px 8px;
}
.theme-btn .sun-icon{display:none}
.theme-btn .moon-icon{display:block}
[data-theme="light"] .theme-btn .sun-icon{display:block}
[data-theme="light"] .theme-btn .moon-icon{display:none}

.sidebar-nav{
  flex:1;overflow-y:auto;
  padding:2px 8px 16px;
}
.sidebar-nav::-webkit-scrollbar{width:3px}
.sidebar-nav::-webkit-scrollbar-track{background:transparent}
.sidebar-nav::-webkit-scrollbar-thumb{background:rgba(255,255,255,0.06);border-radius:3px}
[data-theme="light"] .sidebar-nav::-webkit-scrollbar-thumb{background:rgba(0,0,0,0.06)}

.nav-group{
  margin-bottom:4px;
}
.nav-group + .nav-group{
  border-top:1px solid var(--sidebar-border);
  padding-top:4px;
  margin-top:4px;
}
.nav-group-title{
  display:flex;align-items:center;gap:4px;
  padding:5px 10px;
  font-size:10px;font-weight:600;
  color:var(--sidebar-text);
  text-transform:uppercase;letter-spacing:0.07em;
  cursor:pointer;user-select:none;
  transition:color .12s;
}
.nav-group-title:hover{color:var(--sidebar-text-hover)}
.nav-group-title .arrow{
  font-size:6px;
  transition:transform .15s;
  display:inline-block;
  opacity:0.4;
}
.nav-group-title.closed .arrow{transform:rotate(-90deg)}

.nav-items{list-style:none}
.nav-items.closed{display:none}
.nav-item{
  margin-bottom:1px;
}
.nav-item a{
  display:flex;align-items:center;gap:6px;
  padding:5px 10px;
  font-size:13px;font-weight:450;
  color:var(--sidebar-text);
  text-decoration:none;
  border-radius:var(--radius-pill);
  transition:all .1s;
  cursor:pointer;
}
.nav-item a:hover{
  color:var(--sidebar-text-hover);
  background:var(--sidebar-hover);
}
.nav-item a.active{
  color:var(--sidebar-text-active);
  background:var(--sidebar-active);
  font-weight:500;
}
.nav-item .ni{
  flex-shrink:0;
  opacity:0.5;
}
.nav-item a.active .ni{opacity:1}

/* ─── Badge grid ─── */
.badge-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:6px;
  margin:12px 0;
}
.badge-demo{
  display:flex;align-items:center;gap:6px;
  padding:6px 8px;
  border-radius:4px;
  background:var(--surface);
  border:1px solid var(--border-light);
  font-size:12px;font-family:var(--mono);font-weight:500;
  color:var(--badge-color);
}
.badge-demo .bd-icon{
  flex-shrink:0;
  display:flex;align-items:center;
  width:20px;height:20px;
  color:var(--badge-color);
}
@media(max-width:600px){.badge-grid{grid-template-columns:repeat(2,1fr)}}

/* ─── Doc bar (breadcrumb) ─── */
.doc-bar{
  max-width:var(--content-max);
  margin:0 auto;
  padding:24px 40px 0;
  font-size:12.5px;
  color:var(--text-muted);
}
.doc-bar a{
  color:var(--text-muted);
  text-decoration:none;
  transition:color .1s;
}
.doc-bar a:hover{color:var(--accent)}
.doc-bar-sep{
  margin:0 5px;
  color:var(--border);
}

/* ─── Main ─── */
.main{
  margin-left:var(--sidebar-w);
  min-height:100vh;
}
.content{
  max-width:var(--content-max);
  margin:0 auto;
  padding:28px 40px 100px;
}

/* ─── Sections ─── */
.doc-section{display:none}
.doc-section.active{
  display:block;
  animation:fadeIn .18s ease both;
}
@keyframes fadeIn{
  from{opacity:0;transform:translateY(4px)}
  to{opacity:1;transform:none}
}

/* ─── Section hero ─── */
.section-hero{
  margin-bottom:28px;
  padding-bottom:24px;
  border-bottom:1px solid var(--border-light);
}
.hero-badge{
  display:inline-flex;
  padding:3px 9px;
  border-radius:4px;
  font-size:10.5px;font-weight:600;
  background:var(--accent-mid);
  color:var(--accent-text);
  margin-bottom:10px;
  letter-spacing:0.02em;
}
.section-hero h1{
  font-size:2rem;font-weight:700;
  letter-spacing:-0.03em;
  line-height:1.15;
  color:var(--text);
  margin-bottom:5px;
}
.hero-desc{
  font-size:14.5px;
  color:var(--text-secondary);
  line-height:1.6;
}

/* ─── Nav cards ─── */
.nav-cards{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
  margin-bottom:28px;
}
.nav-card{
  display:flex;align-items:center;gap:10px;
  padding:12px;
  border-radius:var(--radius-sm);
  border:1px solid var(--border);
  background:var(--card-bg);
  text-decoration:none;
  transition:all .12s;
  cursor:pointer;
  border-top:2px solid transparent;
  border-top-color:var(--card-color, transparent);
  position:relative;
}
.nav-card::before{
  content:'';position:absolute;inset:0;
  border-radius:var(--radius-sm);
  opacity:0;
  background:linear-gradient(180deg, color-mix(in srgb, var(--card-color, var(--accent)) 3%, transparent), transparent);
  transition:opacity .12s;
  pointer-events:none;
}
.nav-card:hover{
  border-color:color-mix(in srgb, var(--card-color, var(--accent)) 25%, var(--border));
  box-shadow:0 2px 8px rgba(0,0,0,0.03);
}
.nav-card:hover::before{opacity:1}
.nc-icon{
  width:32px;height:32px;border-radius:var(--radius-pill);
  display:flex;align-items:center;justify-content:center;
  flex-shrink:0;
  background:var(--surface);
  transition:background .12s;
}
.nav-card:hover .nc-icon{background:color-mix(in srgb, var(--card-color, var(--accent)) 8%, var(--surface))}
.nc-body{min-width:0}
.nc-body strong{
  display:block;
  font-size:12.5px;font-weight:600;
  color:var(--text);
  line-height:1.2;
}
.nc-body span{
  display:block;
  font-size:11.5px;
  color:var(--text-secondary);
  margin-top:1px;
}

/* ─── Typography ─── */
.doc-section h2{
  font-size:1.5rem;font-weight:700;
  letter-spacing:-0.02em;
  line-height:1.25;
  color:var(--text);
  margin:32px 0 14px;
  padding-bottom:8px;
  border-bottom:1px solid var(--border-light);
}
.doc-section h2:first-child{margin-top:0}

.doc-section h3{
  font-size:1.0625rem;font-weight:600;
  letter-spacing:-0.01em;
  color:var(--text);
  margin:24px 0 8px;
}
.doc-section h4{
  font-size:0.9375rem;font-weight:600;
  color:var(--text);
  margin:18px 0 6px;
}
.doc-section p{margin:12px 0;color:var(--text)}
.doc-section a{color:var(--accent-text);text-decoration:none;font-weight:500}
.doc-section a:hover{text-decoration:underline}
.doc-section ul,.doc-section ol{margin:8px 0 8px 22px}
.doc-section li{margin:4px 0}
.doc-section strong{font-weight:550}
.doc-section hr{border:none;border-top:1px solid var(--border-light);margin:24px 0}

/* ─── Inline code ─── */
code{
  font-family:var(--mono);
  font-size:0.8125rem;
  background:var(--surface);
  padding:1px 5px;
  border-radius:3px;
  color:var(--accent-text);
  border:1px solid var(--border);
}

/* ─── Code blocks ─── */
.code-block{
  background:var(--code-bg);
  border-radius:var(--radius);
  padding:18px 20px;
  margin:18px 0;
  font-family:var(--mono);
  font-size:0.875rem;
  line-height:1.65;
  position:relative;
  border:1px solid var(--code-border);
  box-shadow:0 1px 3px rgba(0,0,0,0.04);
}
.code-block::after{
  content:attr(data-lang);
  position:absolute;
  top:7px;right:10px;
  font-family:var(--font);
  font-size:9px;font-weight:600;
  color:var(--text-muted);
  text-transform:uppercase;
  letter-spacing:0.06em;
  opacity:0.35;
  pointer-events:none;
  transition:opacity .15s;
}
.code-block:hover::after{opacity:0.7}
.code-block code{
  background:none;padding:0;border:none;color:var(--code-text);
  white-space:pre-wrap;
  overflow-wrap:break-word;
  display:block;
}
.code-block pre{
  margin:0;color:var(--code-text);
  white-space:pre-wrap;
  overflow-wrap:break-word;
}

/* Copy button */
.code-copy{
  position:absolute;top:5px;right:6px;
  background:var(--sa-bg);
  border:1px solid var(--sa-border);
  border-radius:3px;
  padding:3px 7px;
  font-family:var(--font);
  font-size:9.5px;font-weight:500;
  color:var(--sa-text);
  cursor:pointer;
  opacity:0.6;
  transition:all .1s;
  display:flex;align-items:center;gap:3px;
  line-height:1;
}
.code-block:hover .code-copy,
.code-block .code-copy:hover{opacity:1}
.code-copy:hover{
  background:var(--sa-hover);
  color:var(--sa-text-hover);
  border-color:var(--sa-border);
}
.code-copy.copied{
  color:#7EE787;
  border-color:rgba(126,231,135,0.15);
  background:rgba(126,231,135,0.06);
}
[data-theme="light"] .code-copy.copied{
  color:#16A34A;
  border-color:rgba(22,163,74,0.15);
  background:rgba(22,163,74,0.06);
}

/* Syntax highlighting */
[data-theme="dark"] .hl-kw{color:#F97583}
[data-theme="dark"] .hl-str{color:#B5D6FF}
[data-theme="dark"] .hl-num{color:#85C9FF}
[data-theme="dark"] .hl-com{color:#7D8590;font-style:italic}
[data-theme="dark"] .hl-prop{color:#85C9FF}
[data-theme="dark"] .hl-bool{color:#F0883E}
[data-theme="dark"] .hl-type{color:#F0883E}
[data-theme="dark"] .hl-fn{color:#D8A9FF}

[data-theme="light"] .hl-kw{color:#CF222E}
[data-theme="light"] .hl-str{color:#0A3069}
[data-theme="light"] .hl-num{color:#0550AE}
[data-theme="light"] .hl-com{color:#59636E;font-style:italic}
[data-theme="light"] .hl-prop{color:#0550AE}
[data-theme="light"] .hl-bool{color:#953800}
[data-theme="light"] .hl-type{color:#953800}
[data-theme="light"] .hl-fn{color:#8250DF}

/* ─── Images ─── */
.doc-img{
  display:block;
  max-width:100%;
  border-radius:var(--radius);
  border:1px solid var(--border);
  margin:24px 0;
  overflow:hidden;
  box-shadow:0 1px 4px rgba(0,0,0,0.02);
}
.doc-img img{display:block;max-width:100%;height:auto}
.doc-img figcaption{
  padding:6px 12px;
  font-size:12.5px;
  color:var(--text-secondary);
  background:var(--surface);
  border-top:1px solid var(--border);
}

/* ─── Tables ─── */
.table-wrap{
  overflow-x:auto;
  margin:14px 0;
  -webkit-overflow-scrolling:touch;
}
.doc-section table{
  width:100%;
  border-collapse:collapse;
  font-size:13.5px;
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
}
.doc-section thead{background:var(--surface)}
.doc-section th{
  padding:9px 14px;
  text-align:left;
  font-weight:600;
  border-bottom:1px solid var(--border);
  color:var(--text);
  font-size:12.5px;
}
.doc-section td{
  padding:7px 14px;
  border-bottom:1px solid var(--border-light);
  color:var(--text);
}
.doc-section tbody tr:last-child td{border-bottom:none}
.doc-section tbody tr:hover{background:var(--surface)}
.doc-section td code{font-size:12px}

/* ─── Callouts ─── */
.callout{
  display:flex;gap:9px;align-items:flex-start;
  padding:12px 14px;
  margin:16px 0;
  border-radius:var(--radius-sm);
  font-size:14px;
  background:var(--surface);
  border:1px solid var(--border);
  border-left:3px solid;
}
.callout.info{border-left-color:var(--callout-info)}
.callout.info svg{color:var(--callout-info);flex-shrink:0;margin-top:2px}
.callout.warn{border-left-color:var(--callout-warn)}
.callout.warn svg{color:var(--callout-warn);flex-shrink:0;margin-top:2px}
.callout.tip{border-left-color:var(--callout-tip)}
.callout.tip svg{color:var(--callout-tip);flex-shrink:0;margin-top:2px}
.callout p{margin:0;color:var(--text)}

/* ─── Feature grid ─── */
.feature-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:6px;
  margin:14px 0;
}
.feature-item{
  padding:9px 11px;
  border-radius:var(--radius-pill);
  background:var(--surface);
  border:1px solid var(--border-light);
  border-left:2px solid var(--accent-soft);
  transition:border-left-color .12s, background .12s;
}
.feature-item:hover{
  border-left-color:var(--accent);
  background:var(--card-bg);
}
.feature-item strong{
  display:block;
  font-size:13px;font-weight:600;
  margin-bottom:1px;
}
.feature-item span{
  display:block;
  font-size:11.5px;
  color:var(--text-secondary);
}

/* ─── Tags ─── */
.tags-row{
  display:flex;flex-wrap:wrap;gap:4px;
  margin:10px 0;
}
.tag{
  display:inline-flex;align-items:center;
  padding:2px 8px;border-radius:4px;
  font-family:var(--mono);
  font-size:10.5px;font-weight:500;
  background:var(--tag-bg);
  color:var(--tag-color);
}

/* ─── Sidebar toggle ─── */
.sidebar-toggle{
  display:none;position:fixed;top:12px;left:12px;z-index:200;
  background:var(--sidebar-bg);
  border:none;
  border-radius:var(--radius-sm);
  padding:8px;
  cursor:pointer;
  color:var(--sidebar-text);
  transition:color .12s;
}
.sidebar-toggle:hover{color:var(--sidebar-text-active)}

/* ─── Responsive ─── */
@media(max-width:860px){
  .sidebar-toggle{display:flex;align-items:center;justify-content:center}
  .sidebar{
    transform:translateX(-100%);
    transition:transform .2s ease;
  }
  .sidebar.open{transform:translateX(0)}
  .main{margin-left:0}
  .content{padding:20px 20px 80px}
  .doc-bar{padding:20px 20px 0}
}
@media(max-width:600px){
  .nav-cards{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .badge-grid{grid-template-columns:repeat(2,1fr)}
  .content{padding:14px 14px 80px}
  .doc-bar{padding:14px 14px 0}
  .section-hero h1{font-size:1.5rem}
  .doc-section h2{font-size:1.25rem}
  .sidebar-actions{flex-wrap:wrap}
}

/* ─── Search modal ─── */
.search-overlay{
  display:none;position:fixed;inset:0;z-index:1000;
  background:rgba(0,0,0,0.4);
  backdrop-filter:blur(2px);
  align-items:flex-start;justify-content:center;
  padding-top:80px;
  animation:searchFadeIn .12s ease both;
}
.search-overlay.closing{animation:searchFadeOut .12s ease both}
@keyframes searchFadeIn{from{opacity:0}to{opacity:1}}
@keyframes searchFadeOut{from{opacity:1}to{opacity:0}}
.search-modal{
  width:560px;max-width:calc(100vw - 32px);max-height:60vh;
  background:var(--card-bg);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:0 8px 40px rgba(0,0,0,0.25);
  overflow:hidden;
  display:flex;flex-direction:column;
}
.search-modal-input{
  display:block;width:100%;
  padding:12px 14px;
  font-family:var(--font);font-size:14px;
  background:var(--card-bg);
  border:none;border-bottom:1px solid var(--border);
  color:var(--text);
  outline:none;
}
.search-modal-input::placeholder{color:var(--text-muted)}
.search-results{
  overflow-y:auto;
  padding:6px;
}
.search-results::-webkit-scrollbar{width:3px}
.search-results::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:3px}
.sr-empty{
  padding:24px 16px;
  text-align:center;
  color:var(--text-muted);
  font-size:13.5px;
}
.sr-item{
  padding:10px 12px;
  border-radius:var(--radius-pill);
  cursor:pointer;
  transition:background .08s;
}
.sr-item:hover,.sr-item.selected{background:var(--sidebar-active)}
.sr-title{
  font-size:13.5px;font-weight:550;
  color:var(--text);
  margin-bottom:2px;
}
.sr-title mark{
  background:rgba(168,85,247,0.2);
  color:var(--text);
  border-radius:2px;
  padding:0 2px;
}
.sr-snippet{
  font-size:12px;
  color:var(--text-secondary);
  line-height:1.4;
  overflow:hidden;
  text-overflow:ellipsis;
}
.sr-snippet mark{
  background:rgba(168,85,247,0.15);
  color:var(--text-secondary);
  border-radius:2px;
  padding:0 2px;
}
@media(max-width:600px){
  .search-overlay{padding-top:40px}
  .search-modal{max-height:70vh}
}

/* ─── Section TOC ─── */
.section-toc{
  background:var(--accent-soft);
  border:1px solid var(--accent-mid);
  border-radius:var(--radius-sm);
  padding:12px 16px;
  margin:0 0 18px;
}
.section-toc strong{
  display:block;
  font-size:11px;font-weight:600;
  text-transform:uppercase;letter-spacing:0.06em;
  color:var(--accent-text);
  margin-bottom:6px;
}
.section-toc ul{list-style:none;margin:0;padding:0}
.section-toc li{margin:2px 0}
.section-toc a{
  font-size:13px;font-weight:450;
  color:var(--text-secondary);
  text-decoration:none;
  transition:color .1s;
}
.section-toc a:hover{color:var(--accent-text)}
.section-toc .toc-h3 a{padding-left:14px;font-size:12px}

/* ─── Back to top ─── */
#backTop{
  position:fixed;bottom:24px;right:24px;z-index:500;
  width:38px;height:38px;
  border-radius:50%;
  border:1px solid var(--border);
  background:var(--card-bg);
  color:var(--text-secondary);
  cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  opacity:0;transform:translateY(12px);
  transition:all .18s;
  pointer-events:none;
  box-shadow:0 2px 8px rgba(0,0,0,0.04);
}
#backTop.vis{opacity:1;transform:translateY(0);pointer-events:auto}
#backTop:hover{color:var(--text);border-color:var(--text-muted)}

/* ─── Changelog ─── */
.cl-timeline{
  position:relative;
  padding-left:28px;
}
.cl-timeline::before{
  content:'';
  position:absolute;
  left:7px;top:12px;bottom:0;
  width:1.5px;
  background:linear-gradient(180deg, var(--accent-mid), var(--border-light), transparent);
  border-radius:2px;
}
.cl-version{
  position:relative;
  padding-bottom:32px;
  opacity:0;
  animation:clFadeIn .35s ease forwards;
}
.cl-version:last-child{padding-bottom:0}
.cl-version:nth-child(1){animation-delay:0s}
.cl-version:nth-child(2){animation-delay:.12s}
@keyframes clFadeIn{
  from{opacity:0;transform:translateY(6px)}
  to{opacity:1;transform:none}
}
.cl-version::before{
  content:'';
  position:absolute;
  left:-24px;top:6px;
  width:11px;height:11px;
  border-radius:50%;
  background:var(--card-bg);
  border:2px solid var(--accent-mid);
  box-shadow:0 0 0 3px var(--page-bg);
}
.cl-version:first-child::before{
  background:var(--accent);
  border-color:var(--accent);
  box-shadow:0 0 0 3px var(--page-bg), 0 0 12px rgba(168,85,247,0.25);
}
.cl-version-first-line{
  display:flex;align-items:center;gap:12px;
  flex-wrap:wrap;
  margin-bottom:14px;
}
.cl-vtag{
  display:inline-flex;align-items:center;
  padding:3px 11px;
  border-radius:20px;
  font-family:var(--mono);
  font-size:13px;font-weight:600;
  background:var(--accent-mid);
  color:var(--accent-text);
  letter-spacing:-0.03em;
  border:1px solid var(--accent-mid);
  line-height:1.4;
  transition:box-shadow .15s;
}
.cl-version:hover .cl-vtag{
  box-shadow:0 0 16px rgba(168,85,247,0.12);
}
.cl-vlatest{
  display:inline-flex;align-items:center;gap:4px;
  padding:2px 9px;
  border-radius:20px;
  font-size:9.5px;font-weight:600;
  text-transform:uppercase;letter-spacing:0.07em;
  background:rgba(34,197,94,0.12);
  color:#22C55E;
  border:1px solid rgba(34,197,94,0.2);
  line-height:1.3;
}
.cl-vlatest::before{
  content:'';
  width:5px;height:5px;
  border-radius:50%;
  background:#22C55E;
  animation:clPulse 2s ease-in-out infinite;
}
@keyframes clPulse{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:0.5;transform:scale(0.85)}
}
.cl-vdate{
  font-size:12.5px;
  color:var(--text-muted);
  font-weight:450;
  margin-left:auto;
}
.cl-body{
  padding-left:0;
}
.cl-category{
  margin-bottom:12px;
}
.cl-cat-head{
  display:flex;align-items:center;gap:6px;
  margin-bottom:4px;
}
.cl-cat-dot{
  width:6px;height:6px;
  border-radius:50%;
  flex-shrink:0;
}
.cl-cat-dot.cl-perf{background:#60A5FA}
.cl-cat-dot.cl-naming{background:#A78BFA}
.cl-cat-dot.cl-config{background:#FBBF24}
.cl-cat-dot.cl-fixes{background:#F87171}
.cl-cat-dot.cl-css{background:#34D399}
.cl-cat-dot.cl-house{background:#94A3B8}
.cl-cat-label{
  font-size:10.5px;font-weight:600;
  text-transform:uppercase;letter-spacing:0.05em;
  color:var(--text-muted);
}
.cl-cat-perf .cl-cat-label{color:#60A5FA}
.cl-cat-naming .cl-cat-label{color:#A78BFA}
.cl-cat-config .cl-cat-label{color:#FBBF24}
.cl-cat-fixes .cl-cat-label{color:#F87171}
.cl-cat-css .cl-cat-label{color:#34D399}
.cl-cat-house .cl-cat-label{color:#94A3B8}
.cl-cat-items{
  margin:0;
  padding:0;
  list-style:none;
}
.cl-cat-items > li{
  font-size:13.5px;
  color:var(--text);
  margin:0 0 4px;
  padding:3px 0 3px 12px;
  line-height:1.55;
  position:relative;
}
.cl-cat-items > li::before{
  content:'';
  position:absolute;
  left:0;top:12px;
  width:4px;height:1.5px;
  border-radius:1px;
  background:var(--border);
}
.cl-cat-items > li:last-child{margin-bottom:0}
.cl-cat-items strong{font-weight:600}
.cl-cat-items code{font-size:12px}
.cl-cat-items ul{
  margin:3px 0 2px 16px;
  padding:0;
  list-style:none;
}
.cl-cat-items ul li{
  font-size:12.5px;
  color:var(--text-secondary);
  margin:1px 0;
  padding:2px 0;
  position:relative;
}
.cl-cat-items ul li code{font-size:11.5px}
.cl-cat-items .cl-inline-code{
  font-size:inherit;
}

/* ─── Reduced motion ─── */
@media(prefers-reduced-motion:reduce){
  .doc-section.active{animation:none}
  .sidebar{transition:none}
}