/* GIGA CENTRE — дизайн-концепция Sber Immersive Team (blueprint / technical).
   Светлая техническая эстетика: белый фон, чёрный крупный wordmark, моно-аннотации,
   кресты-засечки, сдержанный Сбер-зелёный акцент. Тёмные слоты под визуализации зон.
   Контент-структура прежняя — сменён только визуальный язык. */

:root {
  --bg: #ffffff;
  --bg-1: #f6f6f4;
  --bg-2: #efefec;
  --surface: #f7f7f5;
  --line: #e4e4e0;
  --line-2: #c9c9c4;
  --ink: #0b0b0b;
  --ink-dim: #4a4a48;
  --ink-mute: #9a9a95;
  /* GIGACENTER = чистый ч/б технический: без ярких зелёных/синих, акценты монохром */
  --accent: #0f0f0f;     /* чёрный — основной акцент */
  --accent-2: #6a6a6a;   /* средне-серый */
  --accent-3: #0f0f0f;   /* чёрный — ссылки */
  --warn: #8a8a8a;       /* серый — verify/warn */
  --ok: #0f0f0f;
  --sber-green: #0f0f0f;
  --viz-bg: #0a0a0c;     /* фон слота визуализации (тёмный) */
  --maxw: 1320px;
  --side: 280px;
  --font-sans: "Inter", -apple-system, system-ui, sans-serif;
  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
/* тонкая техническая сетка фона */
body::before {
  content: "";
  position: fixed; inset: 0; pointer-events: none; z-index: -1;
  background-image:
    linear-gradient(rgba(0,0,0,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.018) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* Layout */
.layout { display: grid; grid-template-columns: var(--side) 1fr; min-height: 100vh; }

aside.nav {
  position: sticky; top: 0; align-self: start; height: 100vh; overflow-y: auto;
  border-right: 1px solid var(--line); background: var(--bg-1); padding: 28px 22px;
}
.nav .brand {
  font-family: var(--font-display); font-weight: 700; font-size: 17px;
  letter-spacing: 0.02em; line-height: 1.12; margin-bottom: 4px; text-transform: uppercase;
}
.nav .brand .dot { color: var(--accent); }
.nav .tag {
  font-family: var(--font-mono); font-size: 10px; text-transform: uppercase;
  letter-spacing: 0.16em; color: var(--ink-mute); margin-bottom: 26px;
}
.nav ol { list-style: none; padding: 0; margin: 0 0 24px; counter-reset: navc; }
.nav ol li { counter-increment: navc; margin-bottom: 1px; }
.nav ol li a {
  display: block; padding: 8px 12px 8px 38px; color: var(--ink-dim); text-decoration: none;
  border-radius: 4px; font-size: 13px; position: relative; transition: background .15s, color .15s;
}
.nav ol li a::before {
  content: counter(navc, decimal-leading-zero); position: absolute; left: 12px; top: 8px;
  font-family: var(--font-mono); font-size: 10px; color: var(--ink-mute);
}
.nav ol li a:hover { background: var(--bg-2); color: var(--ink); }
.nav ol li a.active { background: var(--ink); color: #fff; font-weight: 600; }
.nav ol li a.active::before { color: rgba(255,255,255,.5); }

main { padding: 56px 64px 120px; max-width: 100%; }
.page { max-width: 1000px; position: relative; }

/* кресты-засечки по углам контента (blueprint) */
.page::before, .page::after {
  content: "+"; position: absolute; font-family: var(--font-mono); font-size: 18px;
  color: var(--line-2); line-height: 1; pointer-events: none;
}
.page::before { top: -6px; left: -28px; }
.page::after { top: -6px; right: -28px; }

/* Hero */
.hero { padding: 8px 0 44px; border-bottom: 1px solid var(--line); margin-bottom: 44px; }
.kicker {
  display: inline-block; font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--ink-mute); border: 1px solid var(--line-2);
  padding: 4px 10px; border-radius: 2px; margin-bottom: 26px;
}
h1 {
  font-family: var(--font-display); font-weight: 700; font-size: clamp(38px, 5.2vw, 64px);
  line-height: 1.0; letter-spacing: -0.02em; margin: 0 0 18px; text-transform: uppercase;
}
h1 .neon { color: inherit; }
h1 .pink { color: inherit; }
.lead { font-size: 18px; line-height: 1.55; color: var(--ink-dim); max-width: 780px; margin: 0; }
.lead strong { color: var(--ink); font-weight: 600; }

h2 {
  font-family: var(--font-display); font-weight: 700; font-size: 28px; letter-spacing: -0.015em;
  line-height: 1.15; margin: 56px 0 14px; text-transform: uppercase;
}
h2::before {
  content: "//"; color: var(--accent); font-family: var(--font-mono); font-size: 0.55em;
  vertical-align: 0.3em; margin-right: 8px; font-weight: 500;
}
h2.zh::before { content: ""; margin: 0; }
h3 { font-family: var(--font-display); font-weight: 600; font-size: 20px; letter-spacing: -0.01em; margin: 36px 0 10px; color: var(--ink); }
h4 { font-family: var(--font-display); font-weight: 600; font-size: 16px; margin: 22px 0 8px; color: var(--ink); }

p { margin: 0 0 14px; orphans: 3; widows: 3; }
a { color: var(--accent-3); text-decoration: none; border-bottom: 1px solid rgba(24,144,48,.3); }
a:hover { color: var(--accent); border-bottom-color: var(--accent); }
ul, ol { margin: 0 0 18px; padding-left: 22px; }
li { margin-bottom: 6px; }
strong { color: var(--ink); }
em { color: var(--ink-dim); font-style: italic; }

code, .mono {
  font-family: var(--font-mono); font-size: 0.86em; background: var(--bg-2);
  border: 1px solid var(--line); padding: 1px 5px; border-radius: 3px; color: var(--accent-3);
}
pre {
  background: var(--bg-1); border: 1px solid var(--line); border-left: 3px solid var(--accent);
  border-radius: 4px; padding: 16px 18px; overflow-x: auto; font-family: var(--font-mono);
  font-size: 13px; line-height: 1.55; color: var(--ink-dim);
}

/* Слот визуализации зоны (тёмный, под будущие генерации) */
.zone-viz {
  position: relative; aspect-ratio: 16 / 9; background: var(--viz-bg);
  border: 1px solid var(--line-2); border-radius: 4px; overflow: hidden; margin: 0 0 26px;
  display: flex; align-items: center; justify-content: center;
}
.zone-viz img { width: 100%; height: 100%; object-fit: cover; display: block; }
.zone-viz .ph {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.22em; text-transform: uppercase;
  color: #5a5a62; text-align: center; padding: 0 16px;
}
.zone-viz .ph b { color: #8a8a92; display: block; font-size: 13px; letter-spacing: 0.12em; margin-bottom: 6px; }
.zone-viz::before, .zone-viz::after {
  content: "+"; position: absolute; color: #3a3a42; font-family: var(--font-mono); font-size: 16px;
}
.zone-viz::before { top: 8px; left: 10px; }
.zone-viz::after { bottom: 8px; right: 10px; }

/* Cards */
.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); margin: 18px 0 28px; }
.card { background: var(--bg); border: 1px solid var(--line); border-radius: 4px; padding: 20px; transition: border-color .15s; }
.card:hover { border-color: var(--ink); }
.card h4 { margin-top: 0; }
.card .meta { font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-mute); margin-bottom: 8px; }
.card.accent { border-color: var(--accent); }
.card.accent h4 { color: var(--accent); }
.card.warn { border-left: 3px solid var(--warn); }
.card.ok { border-left: 3px solid var(--ok); }
.card.pink { border-left: 3px solid var(--accent-2); }
.card.cyan { border-left: 3px solid var(--accent-3); }

/* Tag */
.tag-pill {
  display: inline-block; font-family: var(--font-mono); font-size: 10px; text-transform: uppercase;
  letter-spacing: 0.1em; padding: 2px 7px; border-radius: 2px; border: 1px solid var(--line-2);
  color: var(--ink-dim); margin-right: 6px; margin-bottom: 6px; background: var(--bg-1);
}
.tag-pill.accent { color: var(--accent); border-color: var(--accent); }
.tag-pill.pink { color: var(--accent-2); border-color: var(--accent-2); }
.tag-pill.cyan { color: var(--accent-3); border-color: var(--accent-3); }
.tag-pill.warn { color: var(--warn); border-color: var(--warn); }

.nav-contact { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); font-size: .72rem; color: var(--ink-mute); line-height: 1.55; }
.nav-contact a { color: var(--accent-3); text-decoration: none; font-weight: 600; border: none; }
.nav-contact a:hover { text-decoration: underline; }

.figrow { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin: 1rem 0; }
.figrow figure { margin: 0; }
.figrow img { width: 100%; border-radius: 4px; border: 1px solid var(--line-2); display: block; background: var(--viz-bg); }
.figrow figcaption { color: var(--ink-dim); font-size: .8rem; margin-top: .35rem; }
figure img { max-width: 100%; }

/* Table */
table { width: 100%; border-collapse: collapse; margin: 16px 0 28px; font-size: 14px; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th {
  font-family: var(--font-mono); font-weight: 500; font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--ink); border-bottom: 2px solid var(--ink);
}
tbody tr:hover { background: var(--bg-1); }

/* Callout */
.callout {
  background: var(--bg-1); border: 1px solid var(--line); border-left: 3px solid var(--accent);
  padding: 16px 20px; border-radius: 4px; margin: 22px 0;
}
.callout.warn { border-left-color: var(--warn); }
.callout.pink { border-left-color: var(--accent-2); }
.callout.cyan { border-left-color: var(--accent-3); }
.callout.accent { border-left-color: var(--accent); }
.callout p:last-child { margin-bottom: 0; }
.callout .label {
  font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.15em;
  color: var(--accent); display: block; margin-bottom: 8px;
}
.callout.warn .label { color: var(--warn); }
.callout.pink .label { color: var(--accent-2); }
.callout.cyan .label { color: var(--accent-3); }

/* Pager */
.pager { display: flex; justify-content: space-between; align-items: center; margin-top: 72px; padding-top: 28px; border-top: 1px solid var(--line); font-family: var(--font-display); }
.pager a { border: none; color: var(--ink); font-size: 15px; font-weight: 600; }
.pager a span { display: block; font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.2em; color: var(--ink-mute); margin-bottom: 4px; font-weight: 400; }
.pager a:hover { color: var(--accent); }

/* Misc */
.divider { height: 1px; background: var(--line); margin: 32px 0; border: none; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin: 24px 0 32px; }
.stat { border: 1px solid var(--line); border-radius: 4px; padding: 18px 20px; background: var(--bg-1); }
.stat .num { font-family: var(--font-display); font-size: 30px; font-weight: 700; letter-spacing: -0.02em; color: var(--accent); line-height: 1; display: block; margin-bottom: 6px; }
.stat .num.pink { color: var(--accent-2); }
.stat .num.cyan { color: var(--accent-3); }
.stat .lbl { font-size: 12px; color: var(--ink-dim); text-transform: uppercase; letter-spacing: 0.08em; }

/* TOC */
.toc { background: var(--bg-1); border: 1px solid var(--line); border-radius: 4px; padding: 18px 22px; margin: 24px 0 40px; }
.toc h4 { margin: 0 0 12px; font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.18em; color: var(--ink-mute); font-weight: 500; }
.toc ol { margin: 0; padding-left: 22px; font-size: 14px; }
.toc ol li { margin-bottom: 4px; }
.toc ol li a { color: var(--ink-dim); border: none; }
.toc ol li a:hover { color: var(--accent); }

/* ===== Cover (титульник GIGACENTER 1:1) ===== */
.cover {
  position: relative; border: 1px solid var(--ink); padding: 64px 48px 40px; margin: 0 0 48px;
  min-height: 62vh; display: flex; flex-direction: column; justify-content: center;
}
.cover .cmark { position: absolute; font-family: var(--font-mono); font-size: 18px; color: var(--ink); }
.cover .cmark.tl { top: 14px; left: 16px; } .cover .cmark.tr { top: 14px; right: 16px; }
.cover .cmark.bl { bottom: 14px; left: 16px; } .cover .cmark.br { bottom: 14px; right: 16px; }
.cover .anno { position: absolute; font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.08em; color: var(--ink-dim); line-height: 1.5; }
.cover .anno.a1 { top: 40px; left: 48px; } .cover .anno.a2 { top: 40px; right: 48px; text-align: right; }
.cover .anno.a3 { bottom: 64px; left: 48px; } .cover .anno.a4 { bottom: 64px; right: 48px; text-align: right; }
.cover .word {
  font-family: var(--font-display); font-weight: 700; font-size: clamp(32px, 9.2vw, 116px);
  line-height: 0.95; letter-spacing: -0.03em; text-transform: uppercase; white-space: nowrap;
  transform: scaleX(1.04); transform-origin: left center; margin: 8px 0;
}
.cover .sub { font-family: var(--font-display); font-weight: 600; font-size: clamp(15px, 2vw, 22px); text-transform: uppercase; letter-spacing: 0.01em; max-width: 640px; margin: 14px 0 0; }
.cover .credit { position: absolute; bottom: 18px; left: 0; right: 0; text-align: center; font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.18em; color: var(--ink-mute); text-transform: uppercase; }

/* Comments widget (recolored via vars) */
#comments-root { margin-top: 80px; scroll-margin-top: 20px; }
.cm-widget { background: var(--bg-1); border: 1px solid var(--line); border-radius: 6px; padding: 22px 26px 18px; transition: box-shadow .4s ease; }
.cm-widget.cm-flash { box-shadow: 0 0 0 2px var(--accent); }
.cm-header { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; border-bottom: 1px solid var(--line); padding-bottom: 14px; margin-bottom: 16px; }
.cm-title { font-family: var(--font-display); font-weight: 600; font-size: 16px; display: inline-flex; align-items: center; gap: 8px; }
.cm-badge { display: inline-flex; align-items: center; justify-content: center; background: var(--accent); color: #fff; font-family: var(--font-mono); font-size: 11px; font-weight: 600; min-width: 22px; height: 20px; padding: 0 7px; border-radius: 999px; }
.cm-status { flex: 1; font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.16em; color: var(--ink-mute); }
.cm-status::before { content: "●"; margin-right: 6px; }
.cm-status[data-state="online"]::before { color: var(--ok); }
.cm-status[data-state="offline"]::before { color: var(--accent-2); }
.cm-status[data-state="loading"]::before { color: var(--warn); }
.cm-setauthor { background: transparent; border: 1px solid var(--line-2); color: var(--ink-dim); font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.12em; padding: 5px 11px; border-radius: 3px; cursor: pointer; }
.cm-setauthor:hover { color: var(--accent); border-color: var(--accent); }
.cm-list { margin-bottom: 16px; }
.cm-empty { color: var(--ink-mute); font-size: 14px; font-style: italic; padding: 8px 0 16px; }
.cm-item { border-left: 2px solid var(--line-2); padding: 10px 0 12px 14px; margin-bottom: 12px; }
.cm-item:hover { border-left-color: var(--accent); }
.cm-head { display: flex; align-items: center; gap: 10px; font-size: 12px; margin-bottom: 6px; }
.cm-author { color: var(--accent); font-weight: 600; font-size: 13px; }
.cm-time { color: var(--ink-mute); font-family: var(--font-mono); font-size: 11px; }
.cm-anchor { background: var(--bg-2); color: var(--accent-3) !important; font-family: var(--font-mono); font-size: 10px; padding: 2px 7px; border-radius: 3px; border: none !important; text-transform: uppercase; }
.cm-del { margin-left: auto; background: transparent; border: none; color: var(--ink-mute); font-size: 18px; line-height: 1; cursor: pointer; padding: 0 6px; }
.cm-del:hover { color: var(--accent-2); }
.cm-text { font-size: 14.5px; color: var(--ink); line-height: 1.55; word-break: break-word; }
.cm-form { display: flex; flex-direction: column; gap: 8px; }
.cm-form input, .cm-form textarea { width: 100%; background: var(--bg); border: 1px solid var(--line-2); color: var(--ink); padding: 9px 12px; border-radius: 4px; font-family: var(--font-sans); font-size: 14px; resize: vertical; }
.cm-form input { font-family: var(--font-mono); font-size: 12px; }
.cm-form input:focus, .cm-form textarea:focus { outline: none; border-color: var(--accent); }
.cm-actions { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.cm-hint { font-size: 12px; color: var(--ink-mute); }
.cm-hint b { color: var(--ink); }
#cm-send { background: var(--ink); color: #fff; border: none; padding: 9px 20px; font-family: var(--font-display); font-weight: 600; font-size: 13px; border-radius: 4px; cursor: pointer; }
#cm-send:hover { background: var(--accent); }
#cm-send:disabled { opacity: .5; cursor: not-allowed; }

/* Keep logical blocks together on screen and in print */
.callout, figure, .figref, .cards, .stat-grid, .toc { break-inside: avoid; page-break-inside: avoid; }
table { break-inside: auto; }
thead { display: table-header-group; }
tr { break-inside: avoid; page-break-inside: avoid; }

@media print {
  body::before { display: none; } aside.nav { display: none; } .layout { grid-template-columns: 1fr; }
  main { padding: 0; } .page::before, .page::after { display: none; }
  .card, .callout, figure, table { break-inside: avoid; page-break-inside: avoid; }
}
@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  aside.nav { position: relative; height: auto; border-right: none; border-bottom: 1px solid var(--line); }
  main { padding: 32px 20px 64px; }
  .page::before, .page::after { display: none; }
  .cover { padding: 48px 20px 36px; }
}

/* ===== 2K / широкие мониторы: центрируем layout, расширяем контент ===== */
@media (min-width: 1700px) {
  :root { --side: 320px; }
  .layout { max-width: 1840px; margin: 0 auto; background: var(--bg); border-left: 1px solid var(--line); border-right: 1px solid var(--line); }
  aside.nav { height: 100vh; }
  body { font-size: 16px; }
  main { padding: 72px 100px 140px; }
  .page { max-width: 1200px; margin: 0 auto; }
  .cover { min-height: 66vh; padding: 72px 64px 48px; }
  .cover .word { font-size: clamp(96px, 7.4vw, 150px); }
  .cards { gap: 18px; }
}
@media (min-width: 2300px) {
  :root { --side: 360px; }
  .layout { max-width: 2200px; }
  body { font-size: 17px; }
  main { padding: 96px 128px 170px; }
  .page { max-width: 1440px; }
  .cover .word { font-size: clamp(120px, 7vw, 190px); }
  h1 { font-size: clamp(48px, 4.4vw, 76px); }
  h2 { font-size: 34px; }
}


/* ===================== DARK THEME (Dracula-like) — default ===================== */
:root[data-theme="dark"]{
  --bg:#282a36; --bg-1:#21222c; --bg-2:#191a21; --surface:#21222c;
  --line:#383a4a; --line-2:#4d5066;
  --ink:#f8f8f2; --ink-dim:#c2c6da; --ink-mute:#7b86b4;
  --accent:#9a9fc4; --accent-2:#9aa0c0; --accent-3:#b6bad6;
  --warn:#c9a877; --ok:#9a9fc4; --sber-green:#9a9fc4;
  --viz-bg:#14151c;
}
:root[data-theme="dark"] body::before{
  background-image:
    linear-gradient(rgba(255,255,255,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.022) 1px, transparent 1px);
}
/* soft frame под белофонные диаграммы, чтобы не слепили на тёмном */
:root[data-theme="dark"] .figref img{background:#0e0f15;}
:root[data-theme="dark"] img{filter:saturate(.98);}
/* плавающий переключатель темы */
#theme-toggle{
  position:fixed; right:16px; bottom:16px; z-index:60;
  font-family:var(--font-mono); font-size:11px; letter-spacing:.06em; text-transform:uppercase;
  background:var(--bg-1); color:var(--ink-dim); border:1px solid var(--line-2);
  border-radius:999px; padding:8px 14px; cursor:pointer; box-shadow:0 2px 12px rgba(0,0,0,.28);
  transition:color .15s, border-color .15s, background .15s; user-select:none;
}
#theme-toggle:hover{color:var(--ink); border-color:var(--accent);}
@media print{ #theme-toggle{display:none;} }

/* dark-theme polish */
:root[data-theme="dark"] .nav ol li a.active{ background:var(--accent); color:#1a1b22; }
:root[data-theme="dark"] .nav ol li a.active::before{ color:rgba(0,0,0,.45); }
:root[data-theme="dark"] .tag-pill{ border-color:var(--line-2); }
:root[data-theme="dark"] .prompt{ border-color:#21222c; }

/* ===== team collab (collapse + notes) ===== */
.cbar{margin-left:10px;font-family:var(--font-mono);white-space:nowrap;vertical-align:middle}
.cbar button{background:transparent;border:1px solid var(--line-2);color:var(--ink-mute);border-radius:4px;padding:0 6px;margin-left:4px;cursor:pointer;font-size:12px;line-height:1.7}
.cbar button:hover{color:var(--ink);border-color:var(--accent)}
.cnote{background:var(--bg-2);border-left:3px solid var(--accent);color:var(--ink-dim);font-size:.88rem;padding:8px 12px;border-radius:4px;margin:8px 0}
#collab-toggle,#collab-export{position:fixed;right:16px;z-index:60;font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;text-transform:uppercase;background:var(--bg-1);color:var(--ink-dim);border:1px solid var(--line-2);border-radius:999px;padding:8px 14px;cursor:pointer;box-shadow:0 2px 12px rgba(0,0,0,.28)}
#collab-toggle{bottom:54px}#collab-export{bottom:92px}
#collab-toggle:hover,#collab-export:hover{color:var(--ink);border-color:var(--accent)}
#collab-toggle.on{color:#1a1b22;background:var(--accent);border-color:var(--accent)}
@media print{#collab-toggle,#collab-export{display:none!important}}


/* ==================== THEME: SBER (official Sber Immersive visual system) — default ==================== */
:root[data-theme="sber"]{
  --bg:#ffffff; --bg-1:#fbfbfa; --bg-2:#f1f1ee; --surface:#fbfbfa;
  --line:#e7e7e2; --line-2:#cdcdc7;
  --ink:#0a0a0a; --ink-dim:#3b3b39; --ink-mute:#9c9c96;
  --accent:#0f0f0f; --accent-2:#6a6a6a; --accent-3:#151515;
  --warn:#8a8a86; --ok:#0f0f0f; --sber-green:#6a6a6a;
  --viz-bg:#0a0a0a;
}
:root[data-theme="sber"] .page h1{font-family:"Saira","Space Grotesk",sans-serif;font-weight:900;text-transform:uppercase;letter-spacing:-.01em;line-height:.97;}
:root[data-theme="sber"] .page h2{font-family:"Saira","Space Grotesk",sans-serif;font-weight:800;letter-spacing:.005em;}
:root[data-theme="sber"] .brand{font-family:"Saira","Space Grotesk",sans-serif;font-weight:800;}
:root[data-theme="sber"] body::before{background-image:linear-gradient(rgba(0,0,0,.014) 1px,transparent 1px),linear-gradient(90deg,rgba(0,0,0,.014) 1px,transparent 1px);}
:root[data-theme="sber"] .page a{color:#0f0f0f;text-decoration:underline;text-decoration-color:var(--line-2);text-underline-offset:2px;}
:root[data-theme="sber"] .page a:hover{text-decoration-color:#0f0f0f;}



/* ==================== FULL-WIDTH LAYOUT ==================== */
.page{max-width:1500px;}
.page > p, .page > ul, .page > ol, .hero .lead, .lead{max-width:1040px;}
@media (min-width:1700px){ .page{max-width:1560px;} }
@media (min-width:2300px){ .page{max-width:1780px;} }

/* ==================== COLLAPSIBLE SIDEBAR (burger <-> X) ==================== */
aside.nav{transition:transform .28s ease, opacity .2s ease; padding-top:62px;}
body.nav-collapsed{--side:0px;}
body.nav-collapsed aside.nav{transform:translateX(-100%);opacity:0;pointer-events:none;}
body.nav-collapsed main{padding-left:72px;}
.nav-fab{position:fixed;top:14px;left:14px;z-index:80;width:40px;height:40px;border-radius:9px;
  background:var(--bg-1);border:1px solid var(--line-2);cursor:pointer;box-shadow:0 2px 12px rgba(0,0,0,.14);
  display:flex;align-items:center;justify-content:center;}
.nav-fab span{position:absolute;display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;
  transition:transform .26s ease, opacity .18s ease;}
.nav-fab span:nth-child(1){transform:translateY(-5px);}
.nav-fab span:nth-child(3){transform:translateY(5px);}
.nav-fab.is-x span:nth-child(1){transform:rotate(45deg);}
.nav-fab.is-x span:nth-child(2){opacity:0;}
.nav-fab.is-x span:nth-child(3){transform:rotate(-45deg);}
@media print{.nav-fab{display:none;}}

/* ==================== FLAT NAV + DROPDOWN (<=3 levels) ==================== */
.brand-sub{font-family:var(--font-mono);font-size:9px;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-mute);font-weight:400;}
.navlist{list-style:none;padding:0;margin:18px 0 0;}
.navlist > li{margin:1px 0;}
.navlist a{display:block;padding:7px 12px;color:var(--ink-dim);text-decoration:none;border-radius:6px;font-size:13px;transition:background .14s,color .14s;}
.navlist a:hover{background:var(--bg-2);color:var(--ink);}
.navlist a.active{background:var(--ink);color:var(--bg);font-weight:600;}
:root[data-theme="sber"] .navlist a.active{background:var(--accent);color:#fff;}
:root[data-theme="dark"] .navlist a.active{background:var(--accent);color:#1a1b22;}
.nav-group{width:100%;display:flex;align-items:center;justify-content:space-between;gap:8px;background:transparent;border:none;
  color:var(--ink-dim);font:inherit;font-size:13px;text-align:left;padding:7px 12px;border-radius:6px;cursor:pointer;transition:background .14s,color .14s;}
.nav-group:hover{background:var(--bg-2);color:var(--ink);}
.nav-group .chev{font-style:normal;font-size:15px;line-height:1;transition:transform .2s ease;opacity:.55;}
.nav-group.open .chev{transform:rotate(90deg);opacity:1;}
.navsub{list-style:none;margin:2px 0 6px;padding:0 0 0 10px;max-height:0;overflow:hidden;transition:max-height .3s ease;border-left:1px solid var(--line);}
.navsub.open{max-height:720px;}
.navsub a{font-size:12.5px;padding:6px 10px;color:var(--ink-mute);}
.navsub a:hover{color:var(--ink);}
.navsub a.active{background:transparent;color:var(--accent-3);font-weight:600;}
:root[data-theme="dark"] .navsub a.active{color:var(--accent);}

/* ==================== TYPOGRAPHY: readability ==================== */
.page p, .page li{ line-height:1.62; }
.page p{ margin:0 0 .92em; text-wrap:pretty; }
.page li{ margin:.22em 0; }
.page h2{ margin-top:2.1rem; margin-bottom:.5rem; }
.page h3{ margin-top:1.5rem; }
.page > p, .page > ul li, .page > ol li{ hyphens:auto; -webkit-hyphens:auto; }
.page h1, .page h2, .page h3, .page h4, .lead{ text-wrap:balance; }
.page p, .page li{ orphans:2; widows:2; }
/* keep logical blocks together (no awkward splits; print/multicol safety) */
.callout, .card, figure, .cards, table, .subtoc, blockquote, .prompt, .nav-toc, tr, .page li{ break-inside:avoid; }
.page h2, .page h3, .page h4, .kicker{ break-after:avoid; }

/* ==================== in-page scroll-spy TOC («на этой странице») ==================== */
.nav-toc{ margin-top:16px; padding-top:13px; border-top:1px solid var(--line); }
.nav-toc-h{ font-family:var(--font-mono); font-size:9px; letter-spacing:.14em; text-transform:uppercase; color:var(--ink-mute); margin:0 0 6px; padding-left:2px; }
.toclist{ list-style:none; margin:0; padding:0; border-left:1px solid var(--line); }
.toclist a{ display:block; padding:4px 10px; margin-left:-1px; border-left:2px solid transparent; color:var(--ink-mute); text-decoration:none; font-size:12px; line-height:1.42; transition:color .14s, border-color .14s; }
.toclist a:hover{ color:var(--ink); }
.toclist a.active{ color:var(--ink); border-left-color:var(--ink); font-weight:600; }
:root[data-theme="dark"] .toclist a.active{ border-left-color:var(--accent); color:var(--ink); }
:root[data-theme="sber"] .toclist a{ text-decoration:none; }

/* ==================== reference / product example links ==================== */
.reflink{font-family:var(--font-mono);font-size:10px;letter-spacing:.03em;white-space:nowrap;color:var(--ink-mute);text-decoration:none;border-bottom:1px dotted var(--line-2);padding-left:1px;}
.reflink:hover{color:var(--ink);border-color:var(--ink);}
td .reflink{margin-left:4px;}