:root{
  --white:#ffffff; --grid:#eef2f6; --panel:#f6f9fc; --panel2:#eef3f8;
  --line:#d7e0ea; --line2:#c7d3e0; --line3:#b6c4d4;
  --ink:#0e1a2b; --body:#233041; --muted:#5c6b7c; --dim:#8a99a9;
  --blue:#0a7fbf; --blue-dark:#0869a0; --blue-soft:#e7f2fb; --navy:#123a5c;
  --teal:#0aa2a0; --teal-soft:#e6f6f6;
  --mono:"Roboto Mono",ui-monospace,"SF Mono","Cascadia Code",Consolas,Menlo,monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --topbar-h:56px;
}
*{box-sizing:border-box}
html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;scroll-behavior:smooth}
body{
  margin:0;background:var(--white);color:var(--ink);
  font-family:var(--sans);line-height:1.55;
}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-dark);text-decoration:underline}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:3px}
::selection{background:var(--blue-soft)}
h1,h2,h3,.card-title,.crumbs .cur{text-wrap:balance}

/* ============================ TOPBAR (datasheet bar) ============================ */
.topbar{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  padding:8px 22px;min-height:var(--topbar-h);
  background:#fff;border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:40;
  box-shadow:0 1px 2px rgba(18,58,92,.03);
}
.brand{display:flex;align-items:center;gap:10px;color:var(--navy);font-weight:700;font-size:16px}
.brand:hover{text-decoration:none;color:var(--navy)}
.brand .mark{
  width:28px;height:28px;flex:0 0 auto;border-radius:8px;
  background:linear-gradient(135deg,var(--blue),var(--teal));
  color:#fff;display:grid;place-items:center;font-size:15px;font-weight:800;
  box-shadow:0 1px 3px rgba(10,127,191,.35);
}
.brand .bt{display:flex;flex-direction:column;line-height:1.1}
.brand .bt small{
  font-weight:500;font-size:9.5px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--muted);
}
.topbar .spacer{flex:1}
.topbar .crumb-mini{font-size:12px;color:var(--dim);white-space:nowrap}
/* search inside topbar: compact pill */
.topbar .search{display:flex;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#fff}
.topbar .search:focus-within{box-shadow:0 0 0 3px var(--blue-soft);border-color:var(--blue)}
.topbar .search input{border:none;padding:7px 13px;font:inherit;color:var(--ink);min-width:230px}
.topbar .search input::placeholder{color:var(--dim)}
.topbar .search input:focus{outline:none}
.topbar .search button{
  border:none;border-left:1px solid var(--line);background:var(--blue);color:#fff;
  padding:0 16px;cursor:pointer;font:inherit;font-weight:600;
}
.topbar .search button:hover{background:var(--blue-dark)}
/* lang pill */
.lang{
  font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:16px;
  padding:4px 12px;white-space:nowrap;background:#fff;
}
.lang:hover{color:var(--blue);border-color:var(--blue);text-decoration:none}

/* breadcrumb sits in the SAME header row as the logo (left, right after the brand).
   No second floor: single-line header, shrinks with ellipsis when space is tight. */
.topbar .crumbs{
  display:inline-flex;align-items:center;gap:6px;flex-wrap:nowrap;
  font-size:12.5px;color:var(--muted);margin:0;padding:0;
  max-width:min(46vw,520px);flex:0 1 auto;min-width:0;white-space:nowrap;overflow:hidden;
}
.topbar .crumbs > *{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:0 1 auto;min-width:0}
.topbar .crumbs a{color:var(--navy);font-weight:600}
.topbar .crumbs a:hover{color:var(--blue)}
.topbar .crumbs .sep{color:var(--dim);flex:0 0 auto}
.topbar .crumbs .cur{color:var(--ink)}
@media(max-width:1120px){
  .topbar .crumbs{max-width:min(34vw,360px)}
}
@media(max-width:760px){
  .topbar .crumbs{display:none} /* на телефоне крошки убираем, чтобы не ломать одну строку шапки */
}

/* ============================ GENERIC BUTTONS ============================ */
button{font:inherit}
button.linkless{border:none;background:none;cursor:pointer;padding:0;color:inherit}

/* ============================ LAYOUT SHELL ============================ */
.wrap{
  display:flex;align-items:flex-start;
  min-height:calc(100vh - var(--topbar-h));
  background:#fff;
}
.sidebar{
  width:300px;flex:0 0 auto;background:var(--panel);
  border-right:1px solid var(--line);padding:16px;
  position:sticky;top:var(--topbar-h);height:calc(100vh - var(--topbar-h));
  overflow-y:auto;
}
.sidebar-right{
  width:268px;flex:0 0 auto;background:var(--panel);
  border-right:none;border-left:1px solid var(--line);
  position:sticky;top:var(--topbar-h);max-height:calc(100vh - var(--topbar-h));
  overflow-y:auto;align-self:flex-start;
}
.side-widget{width:100%;overflow:hidden;margin-top:18px}
.side-widget iframe{max-width:100%;display:block;border:0}
.content{
  flex:1 1 auto;min-width:0;padding:26px 34px 90px;position:relative;
}
/* drafting grid behind the reading column */
.content::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.55;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:24px 24px;
}
.content>*{position:relative}
.content > article,.content > section{max-width:860px}
.footer{
  padding:12px 22px;border-top:1px solid var(--line);color:var(--muted);font-size:12.5px;
  background:var(--panel);display:flex;gap:6px;flex-wrap:wrap;align-items:center;
}
.footer a{color:var(--muted);margin:0 6px}
.footer a:hover{color:var(--blue)}
.footer .sep{color:var(--line3)}

/* ============================ LEFT SIDEBAR ============================ */
.sidebar-search{position:relative;margin:0 0 16px}
.sidebar-search input{
  width:100%;padding:8px 12px;border:1px solid var(--line);border-radius:9px;
  font:inherit;background:#fff;color:var(--ink);
}
.sidebar-search input::placeholder{color:var(--dim)}
.sidebar-search input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-soft)}
.sidebar-head{
  font-size:11px;font-weight:700;letter-spacing:.11em;text-transform:uppercase;color:var(--dim);
  padding:0 2px 6px;margin:0 0 10px;border-bottom:2px solid var(--blue);display:inline-block;
}
/* tree */
.tree{list-style:none;margin:0;padding:0;font-size:13.5px}
.tree ul{padding-left:14px;margin:0;border-left:1px solid var(--line)}
.tree li{position:relative;padding:1.5px 0}
.tree a{
  display:inline-block;padding:3px 9px;border-radius:7px;
  color:var(--muted);max-width:100%;padding-right:22px;
}
.tree a:hover{color:var(--blue);background:#fff;text-decoration:none}
.tree li.active > a{background:var(--blue);color:#fff;font-weight:600}
.tree li.cat > a{color:var(--ink);font-weight:600}
.tree li.root > a{font-weight:700;color:var(--navy)}
.tree li.root > a::before{content:"Σ ";color:var(--blue);font-size:.9em;font-weight:800}
.tree li.active.cat > a{background:var(--blue);color:#fff}
.toggler{
  position:absolute;right:2px;top:3px;width:18px;height:18px;line-height:1;
  border:1px solid var(--line);border-radius:5px;background:#fff;color:var(--dim);
  cursor:pointer;font-size:12px;display:grid;place-items:center;padding:0;
}
.toggler:hover{color:var(--blue);border-color:var(--blue)}
.toggler[aria-expanded="true"]{color:var(--teal)}
.branch.collapsed{display:none}

/* ============================ RIGHT SIDEBAR ============================ */
.side-block{margin-bottom:22px}
.side-block-title{
  margin:0 0 8px;font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--blue);border-bottom:2px solid var(--blue);padding-bottom:5px;display:inline-block;
}
.side-links{list-style:none;margin:0;padding:0;font-size:13px}
.side-links li{padding:1px 0}
.side-links a{display:block;padding:3px 8px;border-radius:7px;color:var(--body)}
.side-links a::before{content:"›";color:var(--blue);margin-right:7px;font-weight:700}
.side-links a:hover{color:var(--blue);background:#fff;text-decoration:none}
.side-static{color:var(--body);font-size:13px;padding:2px 8px;display:inline-block}

/* ============================ TYPEAHEAD (left rail) ============================ */
.typeahead{
  position:absolute;left:0;right:0;top:calc(100% + 4px);list-style:none;margin:0;padding:6px;
  background:#fff;border:1px solid var(--line);border-radius:11px;
  box-shadow:0 10px 30px rgba(18,58,92,.14);
  max-height:55vh;overflow-y:auto;z-index:60;
}
.typeahead li{margin:0;padding:0;border-radius:8px}
.typeahead li.active{background:var(--blue-soft)}
.typeahead a{display:block;padding:6px 10px;color:var(--ink);text-decoration:none;border-radius:8px;line-height:1.3}
.typeahead a:hover{background:var(--blue-soft);text-decoration:none}
.typeahead li.active > a{background:transparent}
.ta-title{display:block;font-weight:600;color:var(--ink)}
.ta-title-ru{display:block;font-size:.8em;color:var(--muted)}
.ta-crumb{display:block;font-size:.72em;color:var(--dim);margin-top:1px;white-space:nowrap;
  overflow:hidden;text-overflow:ellipsis}

/* ============================ CONTENT SEARCH (big) ============================ */
.content .search,.searchpage form.search{
  display:flex;border:1px solid var(--line2);border-radius:12px;overflow:hidden;
  background:#fff;box-shadow:0 1px 2px rgba(18,58,92,.04);max-width:680px;
}
.content .search:focus-within{box-shadow:0 0 0 4px var(--blue-soft);border-color:var(--blue)}
.content .search input{flex:1;border:none;padding:12px 16px;font:inherit;color:var(--ink);min-width:0}
.content .search input::placeholder{color:var(--dim)}
.content .search input:focus{outline:none}
.content .search button{
  border:none;border-left:1px solid var(--line);background:var(--blue);color:#fff;
  padding:0 22px;cursor:pointer;font:inherit;font-weight:600;
}
.content .search button:hover{background:var(--blue-dark)}

/* ============================ BREADCRUMBS ============================ */
.crumbs{color:var(--dim);font-size:12.5px;margin:0 0 16px;display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--blue);text-decoration:underline}
.crumbs .sep{margin:0 2px;color:var(--line3)}
.crumbs .cur{color:var(--navy);font-weight:600}

/* ============================ WIKI CONTENT ============================ */
.wiki{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 32px;
  box-shadow:0 1px 3px rgba(18,58,92,.04)}
.wiki h1,.wiki h2,.wiki h3{line-height:1.28;color:var(--navy)}
.wiki h1{font-size:26px;margin:0 0 6px}
.wiki h1:first-child{margin-top:0}
.wiki h2{font-size:19px;margin:26px 0 8px;padding-top:14px;border-top:1px solid var(--line)}
.wiki h2:first-of-type{padding-top:0;border-top:none}
.wiki h3{font-size:16px;margin:20px 0 6px}
/* SEO CSS-мост: normalize_wiki_headings понижает внутренние H1/H2/H3 до H2/H3/H4 и
   помечает их классом ws<прежний уровень> — эти правила возвращают прежний вид,
   чтобы семантическая правка не изменила дизайн. */
.wiki h2.ws1{font-size:26px;margin:0 0 6px;padding-top:0;border-top:none}
.wiki h3.ws2{font-size:19px;margin:26px 0 8px;padding-top:14px;border-top:1px solid var(--line)}
.wiki h4.ws3{font-size:16px;margin:20px 0 6px}
.wiki h5.ws4{font-size:16px;margin:18px 0 6px;font-weight:700;color:var(--ink)}
.wiki p{margin:12px 0;color:var(--body)}
.wiki img{max-width:100%;height:auto;border:1px solid var(--line);border-radius:9px;
  background:#fff;padding:3px;outline:1px solid rgba(10,127,191,.06);outline-offset:-1px}
.wiki table{border-collapse:separate;border-spacing:0;margin:14px 0;width:auto;max-width:100%;
  font-size:13.5px;background:#fff;overflow:hidden;border:1px solid var(--line);border-radius:10px}
.wiki th,.wiki td{border-bottom:1px solid var(--line);padding:8px 13px;text-align:left;vertical-align:top}
.wiki tr:last-child th,.wiki tr:last-child td{border-bottom:none}
.wiki th{background:var(--panel);color:var(--ink);font-weight:700;font-size:13px;
  letter-spacing:.02em}
.wiki td code,.wiki p code{font-family:var(--mono);font-size:.9em;color:var(--teal);
  background:var(--teal-soft);padding:1px 6px;border-radius:5px}
.wiki pre{background:var(--panel);border:1px solid var(--line);padding:12px 16px;overflow-x:auto;
  border-radius:10px;font-size:13px;line-height:1.5}
.wiki pre code{background:none;color:var(--ink);padding:0}
.wiki blockquote{border-left:3px solid var(--blue);margin:14px 0;padding:2px 0 2px 16px;color:var(--muted)}
.wiki a:not(.card){text-decoration:underline;text-underline-offset:2px}
.wiki a:hover{color:var(--blue-dark)}

/* ============================ HOME: hero + cards ============================ */
.hero{margin:2px 0 8px;padding:26px 0 6px}
.hero h1{font-size:32px;margin:0 0 8px;color:var(--navy);letter-spacing:-.01em}
.hero .lede{color:var(--body);font-size:16.5px;max-width:640px;margin:0 0 10px}
.hero form.search{margin-top:20px}
.muted{color:var(--muted)}
.cats{margin-top:14px}
.cats h2{font-size:15px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;
  color:var(--blue);border-bottom:2px solid var(--blue-soft);padding-bottom:8px;margin:30px 0 16px;
  display:flex;align-items:center;gap:8px}
.cats h2::before{content:"";width:6px;height:18px;border-radius:2px;
  background:linear-gradient(180deg,var(--blue),var(--teal))}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(235px,1fr));gap:14px}
.card{
  display:flex;flex-direction:column;gap:6px;padding:14px 16px;background:#fff;
  border:1px solid var(--line);border-radius:12px;color:var(--ink);
  transition:border-color .12s,box-shadow .12s,transform .12s;
}
.card:hover{border-color:var(--blue);box-shadow:0 8px 20px rgba(18,58,92,.10);
  transform:translateY(-2px);text-decoration:none}
.card-title{font-weight:600;color:var(--navy)}
.card-title::before{content:"▧ ";color:var(--blue);opacity:.5}
.card-count{
  align-self:flex-start;font-family:var(--mono);font-size:11px;font-weight:700;color:var(--blue);
  background:var(--blue-soft);border-radius:20px;padding:1px 10px;font-variant-numeric:tabular-nums;
}
.card-desc{color:var(--muted);font-size:13px}

/* ============================ SEARCH PAGE ============================ */
.searchpage .search{max-width:680px;margin:8px 0 16px}
.searchpage h1{color:var(--navy)}
ol.results{list-style:none;counter-reset:r;margin:0;padding:0}
ol.results li{
  counter-increment:r;background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:14px 16px 14px 52px;margin-bottom:12px;position:relative;max-width:760px;
}
ol.results li::before{
  content:counter(r);position:absolute;left:16px;top:16px;width:24px;height:24px;border-radius:7px;
  background:var(--panel);border:1px solid var(--line);color:var(--blue);font-family:var(--mono);
  font-size:12px;font-weight:700;display:grid;place-items:center;
}
ol.results li > a{font-weight:600;font-size:16px;color:var(--navy)}
ol.results li > a:hover{color:var(--blue)}
ol.results .path{font-size:12px;color:var(--dim);font-family:var(--mono);margin-left:6px;word-break:break-all}
.snippet{margin:6px 0 0;color:var(--body);font-size:13.5px}
.snippet mark{background:#ffe9a8;padding:0 2px;border-radius:3px;color:var(--ink)}

/* ============================ RELATED / SUBPAGES / SEO ============================ */
.related{margin-top:24px;padding-top:18px;border-top:1px solid var(--line)}
.related h2{font-size:14px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--blue);
  margin:0 0 10px}
.links{list-style:none;margin:0;padding:0;columns:2;column-gap:28px;max-width:760px}
.links li{break-inside:avoid;margin-bottom:6px;padding-left:16px;position:relative}
.links li::before{content:"◦";position:absolute;left:0;top:0;color:var(--teal);font-weight:700}
.links a{color:var(--body)}
.links a:hover{color:var(--blue);text-decoration:underline}
/* ============================ SUMMARY (SEO, renamed from .seo-text) ============================ */
.summary{margin-top:22px;padding:20px 24px;background:#fff;border:1px solid var(--line);
  border-radius:12px;box-shadow:0 1px 2px rgba(18,58,92,.03)}
.summary h2{font-size:16px;font-weight:700;color:var(--navy);margin:0 0 10px}
.summary p{color:#17212f;font-size:14.5px;margin:0 0 10px;line-height:1.7}
.summary p:last-child{margin-bottom:0}

/* ============================ ERROR / misc ============================ */
.error-404{max-width:620px}

/* ============================ RESPONSIVE ============================ */
@media(max-width:1180px){
  .sidebar{width:272px}
  .sidebar-right{width:240px}
}
@media(max-width:900px){
  .topbar .crumb-mini{display:none}
}
@media(max-width:800px){
  .wrap{flex-direction:column;align-items:stretch}
  .sidebar,.sidebar-right{
    width:100%;flex:none;position:static;max-height:42vh;height:auto;
    border:none;border-bottom:1px solid var(--line);overflow-y:auto;
  }
  .sidebar-right{border-bottom:none;border-top:1px solid var(--line)}
  .content{padding:20px 18px 70px}
  .wiki{padding:18px 18px}
  .links{columns:1}
  .topbar{position:static}
  .topbar .search{flex:1 1 100%;order:3}
  .topbar .search input{flex:1;min-width:0}
}
@media(max-width:520px){
  .topbar .brand small{display:none}
  .card{min-height:auto}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}