/* ==========================================================================
   НАСКВОЗЬ — общая дизайн-система
   Идея: монохромная «тёмная комната», где цвет появляется только там,
   где знание уже открыто. У каждой темы свой оттенок спектра (--h),
   готовые темы светятся им, неготовые остаются графитовыми контурами.
   ========================================================================== */

@property --scan { syntax: '<percentage>'; inherits: true; initial-value: -30%; }

:root {
  --bg: #060607;
  --bg-1: #0b0b0d;
  --bg-2: #111114;
  --bg-3: #19191d;
  --line: rgba(255, 255, 255, .075);
  --line-2: rgba(255, 255, 255, .13);
  --line-3: rgba(255, 255, 255, .22);
  --grid: rgba(255, 255, 255, .045);
  --text: #ededef;
  --text-body: #c9c9cf;
  --text-2: #a0a0a8;
  --text-3: #6c6c75;
  --text-4: #45454d;
  --lock: #313138;
  --lock-2: #52525b;
  --glow: rgba(255, 255, 255, .07);
  --term-bg: #0a0a0c;

  --ok: oklch(.80 .15 150);
  --warn: oklch(.82 .14 75);
  --bad: oklch(.70 .17 25);

  /* светлота и насыщенность оттенков тем в текущей теме */
  --L: .80;
  --C: .13;

  --spectrum: linear-gradient(90deg,
    oklch(.82 .14 65), oklch(.84 .15 120), oklch(.82 .13 175),
    oklch(.78 .13 225), oklch(.74 .15 285), oklch(.76 .16 330), oklch(.78 .15 25));

  --f-display: "Unbounded", "Onest", system-ui, sans-serif;
  --f-text: "Onest", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 1240px;
  --read: 1120px;
  --gut: 24px;
  --r-s: 8px;
  --r: 14px;
  --r-l: 22px;
  --ease: cubic-bezier(.2, .7, .2, 1);

  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f3f2ee;
  --bg-1: #ecebe6;
  --bg-2: #e4e3dd;
  --bg-3: #d9d8d1;
  --line: rgba(0, 0, 0, .08);
  --line-2: rgba(0, 0, 0, .14);
  --line-3: rgba(0, 0, 0, .24);
  --grid: rgba(0, 0, 0, .05);
  --text: #111113;
  --text-body: #2b2b30;
  --text-2: #4c4c53;
  --text-3: #85858c;
  --text-4: #a9a9ae;
  --lock: #cfcec8;
  --lock-2: #aeada7;
  --glow: rgba(0, 0, 0, .05);
  --term-bg: #0d0d10;
  --ok: oklch(.55 .15 150);
  --warn: oklch(.60 .14 70);
  --bad: oklch(.55 .19 25);
  --L: .56;
  --C: .14;
  --spectrum: linear-gradient(90deg,
    oklch(.62 .15 65), oklch(.60 .16 130), oklch(.58 .12 185),
    oklch(.55 .14 240), oklch(.52 .17 290), oklch(.55 .18 335), oklch(.58 .17 25));
  color-scheme: light;
}

/* цвет темы: элемент с --h получает свою палитру */
.hue {
  --c: oklch(var(--L) var(--C) var(--h, 0));
  --c2: oklch(calc(var(--L) + .08) calc(var(--C) * .7) calc(var(--h, 0) + 25));
  --c-soft: oklch(var(--L) var(--C) var(--h, 0) / .10);
  --c-line: oklch(var(--L) var(--C) var(--h, 0) / .38);
  --c-glow: oklch(var(--L) var(--C) var(--h, 0) / .45);
}
.mono-hue { --c: var(--text); --c2: var(--text-2); --c-soft: var(--glow); --c-line: var(--line-3); --c-glow: rgba(255,255,255,.35); }

/* ---------- база ---------- */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 400 17px/1.65 var(--f-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}
/* зерно плёнки поверх всего — даёт глубину плоскому чёрному */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 200;
  pointer-events: none;
  opacity: .045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 1.4 0 0 0 -.45'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
:root[data-theme="light"] body::after { filter: invert(1); opacity: .05; }

::selection { background: color-mix(in oklab, var(--text) 22%, transparent); }
a { color: inherit; }
img, svg { max-width: 100%; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; border-radius: 6px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gut); }
.read { max-width: calc(var(--read) + var(--gut) * 2); margin: 0 auto; padding: 0 var(--gut); }
.wide { width: min(1120px, calc(100vw - 32px)); margin-left: calc(50% - min(560px, calc(50vw - 16px))); }
@media (max-width: 720px) { :root { --gut: 16px; } }

.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- мелкие атомы ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font: 500 12px/1.2 var(--f-mono); letter-spacing: .14em; text-transform: uppercase;
  color: var(--text-3);
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: currentColor; opacity: .7; }
.eyebrow--plain::before { display: none; }

.chip {
  display: inline-flex; align-items: center; gap: 7px;
  height: 26px; padding: 0 11px; border-radius: 99px;
  font: 500 11px/1 var(--f-mono); letter-spacing: .1em; text-transform: uppercase;
  color: var(--text-3); border: 1px solid var(--line-2); white-space: nowrap;
}
.chip i { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.chip--ready { color: var(--c); border-color: var(--c-line); background: var(--c-soft); }

kbd {
  font: 500 .78em var(--f-mono); padding: .1em .45em; border-radius: 6px;
  border: 1px solid var(--line-2); border-bottom-width: 2px; background: var(--bg-2); color: var(--text);
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: 50px; padding: 0 24px; border-radius: 99px;
  font: 600 15px/1 var(--f-text); text-decoration: none; cursor: pointer;
  color: var(--text); background: transparent; border: 1px solid var(--line-2);
  transition: transform .25s var(--ease), background .25s, border-color .25s, box-shadow .3s;
}
.btn:hover { border-color: var(--line-3); background: var(--bg-2); }
.btn .arr { transition: transform .3s var(--ease); }
.btn:hover .arr { transform: translateX(4px); }
.btn--primary { background: var(--text); color: var(--bg); border-color: var(--text); }
.btn--primary:hover { background: var(--text); transform: translateY(-1px); box-shadow: 0 14px 40px -14px color-mix(in oklab, var(--text) 55%, transparent); }

.icon-btn {
  width: 40px; height: 40px; border-radius: 50%; display: inline-grid; place-items: center;
  border: 1px solid var(--line-2); background: transparent; cursor: pointer; color: var(--text-2);
  transition: color .2s, border-color .2s, background .2s;
}
.icon-btn:hover { color: var(--text); border-color: var(--line-3); background: var(--bg-2); }
.icon-btn svg { width: 18px; height: 18px; }

/* ---------- верхняя панель ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--bg) 74%, transparent);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.topbar.is-scrolled { border-bottom-color: var(--line); }
.topbar__in { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gut); height: 66px; display: flex; align-items: center; gap: 18px; }
.topbar__progress {
  position: absolute; left: 0; right: 0; bottom: -1px; height: 2px;
  background: var(--c, var(--text)); transform-origin: 0 50%; transform: scaleX(var(--p, 0));
}

.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; color: var(--text); flex: none; }
.brand__mark { width: 26px; height: 26px; flex: none; }
.brand__name { font: 600 14px/1 var(--f-display); letter-spacing: .16em; text-transform: uppercase; }

.crumbs { display: flex; align-items: center; gap: 10px; min-width: 0; font: 500 13px var(--f-mono); color: var(--text-3); }
.crumbs a { text-decoration: none; color: var(--text-2); }
.crumbs a:hover { color: var(--text); }
.crumbs span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.crumbs .sep { opacity: .5; }

.nav { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.nav a { font: 500 14px/1 var(--f-text); color: var(--text-2); text-decoration: none; padding: 10px 14px; border-radius: 99px; transition: color .2s, background .2s; }
.nav a:hover { color: var(--text); background: var(--bg-2); }
.topbar__tools { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.nav + .topbar__tools { margin-left: 8px; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; height: 34px; padding: 0 13px; border-radius: 99px;
  font: 500 12px/1 var(--f-mono); color: var(--text-2); border: 1px solid var(--line); white-space: nowrap;
}
.pill b { color: var(--text); font-weight: 600; }
@media (max-width: 860px) { .nav { display: none; } .topbar__tools, .nav + .topbar__tools { margin-left: auto; } }
@media (max-width: 520px) { .pill--hide-sm { display: none; } .brand__name { letter-spacing: .12em; } }
@media (max-width: 640px) {
  .topbar__in:has(.crumbs) .brand__name { display: none; }
  .crumbs > .sep:first-child, .crumbs > a, .crumbs > a + .sep { display: none; }
  .crumbs { flex: 1; }
}

/* ---------- появление при скролле ---------- */
html.js [data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity .9s var(--ease), transform .9s var(--ease); transition-delay: var(--d, 0s); }
html.js [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- всплывашка ---------- */
.toast {
  position: fixed; left: 50%; bottom: 24px; z-index: 120;
  transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  display: flex; align-items: center; gap: 12px; padding: 12px 18px 12px 14px; border-radius: 99px;
  background: var(--bg-2); border: 1px solid var(--line-2); box-shadow: 0 20px 50px -20px rgba(0,0,0,.6);
  font: 500 14px var(--f-text); color: var(--text); transition: opacity .35s, transform .45s var(--ease);
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }
.toast__ic { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--c, var(--text)); color: #000; }
.toast__ic svg { width: 15px; height: 15px; }
.toast small { color: var(--text-3); font: 500 12px var(--f-mono); }

/* ---------- кнопка «наверх» ---------- */
.totop {
  position: fixed; right: 24px; bottom: calc(24px + env(safe-area-inset-bottom, 0px)); z-index: 60;
  width: 50px; height: 50px; padding: 0; border: 0; border-radius: 50%; display: grid; place-items: center; cursor: pointer;
  color: var(--text); background: color-mix(in oklab, var(--bg-1) 86%, transparent);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); box-shadow: 0 14px 34px -16px rgba(0, 0, 0, .55);
  opacity: 0; transform: translateY(14px) scale(.9); pointer-events: none;
  transition: opacity .3s, transform .4s var(--ease), background .2s;
}
.totop.is-on { opacity: 1; transform: none; pointer-events: auto; }
.totop:hover { background: var(--bg-2); }
.totop:focus-visible { outline: 2px solid var(--c, var(--text)); outline-offset: 3px; }
.totop > svg:last-child { position: relative; width: 20px; height: 20px; transition: transform .3s var(--ease); }
.totop:hover > svg:last-child { transform: translateY(-3px); }
.totop__ring { position: absolute; inset: 0; width: 100%; height: 100%; transform: rotate(-90deg); fill: none; stroke-width: 1.6; }
.totop__ring circle { stroke: var(--line-2); }
.totop__ring .totop__p { stroke: var(--c, var(--text)); stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: calc(1 - var(--p, 0)); transition: stroke-dashoffset .15s linear; }
@media (max-width: 640px) { .totop { right: 16px; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); width: 46px; height: 46px; } }
@media print { .totop { display: none; } }

/* ---------- подвал ---------- */
.foot { border-top: 1px solid var(--line); margin-top: 120px; padding: 48px 0 56px; color: var(--text-3); font-size: 14px; }
.foot__in { display: grid; grid-template-columns: 1.2fr 1fr auto; gap: 32px; align-items: start; }
.foot p { margin: 0 0 6px; }
.foot a { color: var(--text-2); text-decoration: none; }
.foot a:hover { color: var(--text); }
.foot__reset { background: none; border: 0; padding: 0; cursor: pointer; color: var(--text-3); font: 500 13px var(--f-mono); text-decoration: underline; text-underline-offset: 3px; }
.foot__reset:hover { color: var(--bad); }
@media (max-width: 760px) { .foot__in { grid-template-columns: 1fr; } }

/* ==========================================================================
   ЧТЕНИЕ: главы
   ========================================================================== */

.ch-hero { position: relative; padding: 72px 0 56px; overflow: hidden; }
.ch-hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(700px 360px at 85% 0%, var(--c-soft), transparent 70%),
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 64px 64px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 64px 64px;
  -webkit-mask-image: linear-gradient(#000 40%, transparent);
  mask-image: linear-gradient(#000 40%, transparent);
}
.ch-hero > * { position: relative; }
.ch-hero__top { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.ch-hero__num {
  display: block; margin: 26px 0 0;
  font: 700 clamp(84px, 15vw, 190px)/.78 var(--f-display); letter-spacing: -.06em;
  color: transparent; -webkit-text-stroke: 1.5px var(--c);
}
.ch-hero__title { margin: 22px 0 0; font: 600 clamp(36px, 5.4vw, 70px)/1 var(--f-display); letter-spacing: -.04em; color: var(--text); max-width: 24ch; text-wrap: balance; }
.ch-hero__lede { margin: 26px 0 0; max-width: none; font-size: clamp(18px, 1.6vw, 21px); line-height: 1.55; color: var(--text-2); text-wrap: pretty; }
.ch-hero__meta { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 34px; font: 500 13px var(--f-mono); color: var(--text-3); }
.ch-hero__meta b { color: var(--text); font-weight: 600; }

.learn { margin: 0 0 56px; padding: 26px 28px; border-radius: var(--r-l); border: 1px solid var(--line); background: var(--bg-1); }
.learn h2 { margin: 0 0 14px; font: 500 12px var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); }
.learn ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.learn li { position: relative; padding-left: 28px; color: var(--text-body); line-height: 1.5; }
.learn li::before { content: ""; position: absolute; left: 2px; top: .62em; width: 12px; height: 1.5px; background: var(--c); }

.prose { font-size: 18px; line-height: 1.75; color: var(--text-body); }
.prose > :first-child { margin-top: 0; }
.prose p { margin: 0 0 1.15em; text-wrap: pretty; }
.prose h2 {
  margin: 2.8em 0 .8em; font: 600 clamp(26px, 3.3vw, 38px)/1.12 var(--f-display); letter-spacing: -.03em; color: var(--text); text-wrap: balance;
}
.prose h2 .n { display: block; margin-bottom: 14px; font: 500 12px/1 var(--f-mono); letter-spacing: .14em; color: var(--c); }
.prose h3 { margin: 2em 0 .55em; font: 600 21px/1.3 var(--f-text); color: var(--text); letter-spacing: -.01em; }
.prose strong { color: var(--text); font-weight: 600; }
.prose a { color: var(--text); text-decoration: underline; text-decoration-color: var(--c-line); text-decoration-thickness: 1.5px; text-underline-offset: 4px; transition: text-decoration-color .2s; }
.prose a:hover { text-decoration-color: var(--c); }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.3em; }
.prose li { margin: .35em 0; padding-left: .2em; }
.prose li::marker { color: var(--c); }
.prose ol li::marker { font: 600 .85em var(--f-mono); }
.prose hr { border: 0; height: 1px; background: var(--line); margin: 3em 0; }
.ch-hero__lede code { white-space: nowrap; }
.prose code, .faq code, .qa code, .insight code, .trap code, .table code, .learn code, .ch-hero__lede code, .viz__log code {
  font: 500 .84em var(--f-mono); padding: .12em .4em; border-radius: 6px;
  background: var(--bg-2); border: 1px solid var(--line); color: var(--text);
  -webkit-box-decoration-break: clone; box-decoration-break: clone; overflow-wrap: anywhere;
}
.prose .lead { font-size: 21px; line-height: 1.6; color: var(--text); }
.sec { scroll-margin-top: 90px; }

/* термин с определением */
.def { margin: 1.8em 0; padding: 4px 0 4px 22px; border-left: 2px solid var(--c); }
.def dt { font: 600 14px var(--f-mono); color: var(--c); letter-spacing: .02em; }
.def dd { margin: 6px 0 0; color: var(--text); font-size: 18px; line-height: 1.6; }

/* ---------- терминал ---------- */
.term {
  margin-block: 1.8em; border-radius: var(--r); overflow: hidden; background: var(--term-bg);
  border: 1px solid rgba(255, 255, 255, .1); color: #d8d8de; box-shadow: 0 30px 60px -40px rgba(0, 0, 0, .8);
}
.term__bar { display: flex; align-items: center; gap: 12px; padding: 11px 16px; border-bottom: 1px solid rgba(255, 255, 255, .07); font: 500 12px var(--f-mono); color: #7a7a84; }
.term__dots { display: flex; gap: 7px; }
.term__dots i { width: 10px; height: 10px; border-radius: 50%; background: #2b2b31; }
.term__copy { margin-left: auto; background: none; border: 1px solid rgba(255,255,255,.12); color: #8d8d96; border-radius: 6px; height: 26px; padding: 0 9px; font: 500 11px var(--f-mono); cursor: pointer; }
.term__copy:hover { color: #fff; border-color: rgba(255,255,255,.3); }
.term__bar > span:not(.term__dots) { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.term__dots, .term__copy { flex: none; }
.term pre { margin: 0; padding: 18px 20px; overflow-x: auto; font: 400 13.5px/1.65 var(--f-mono); tab-size: 4; scrollbar-width: thin; scrollbar-color: #34343a transparent; }
@media (max-width: 720px) { .term pre { font-size: 12.5px; padding: 16px; } }
.term .p { color: var(--c, #fff); user-select: none; }
.term .cm { color: #66666f; }
.term .o { color: #a8a8b2; }
.term .w { color: #fff; font-weight: 600; }
.term .ok { color: oklch(.82 .15 150); }
.term .er { color: oklch(.74 .17 25); }
.term [data-note] { cursor: help; border-radius: 4px; transition: background .15s, color .15s; box-shadow: inset 0 -1px 0 rgba(255,255,255,.25); }
.term [data-note]:hover, .term [data-note].is-on { background: var(--c-soft, rgba(255,255,255,.1)); color: #fff; box-shadow: inset 0 -2px 0 var(--c, #fff); }
.term__note {
  display: flex; gap: 12px; align-items: flex-start; min-height: 70px; padding: 14px 20px 16px;
  border-top: 1px solid rgba(255, 255, 255, .07); background: rgba(255, 255, 255, .025);
  font: 400 14.5px/1.55 var(--f-text); color: #b9b9c2;
}
.term__note b { color: #fff; font-weight: 600; font-family: var(--f-mono); font-size: 13px; }
.term__note .hint { color: #6f6f78; }

/* ---------- инсайт ---------- */
.insight {
  position: relative; margin-block: 2.2em; padding: 24px 26px 24px 26px; border-radius: var(--r-l);
  border: 1px solid var(--c-line);
  background: radial-gradient(120% 140% at 0% 0%, var(--c-soft), transparent 55%), var(--bg-1);
  transition: border-color .6s, box-shadow .6s;
}
.insight__tag { display: flex; align-items: center; gap: 10px; font: 600 11px/1 var(--f-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--c); }
.insight__tag svg { width: 16px; height: 16px; }
.insight__tag .state { margin-left: auto; color: var(--text-4); letter-spacing: .1em; transition: color .4s; }
.insight__text { margin: 12px 0 0; font: 500 19px/1.55 var(--f-text); color: var(--text); text-wrap: pretty; }
.insight__text + p { margin: 10px 0 0; color: var(--text-2); font-size: 16px; line-height: 1.6; }
.insight.is-caught { box-shadow: 0 0 0 1px var(--c-line), 0 24px 60px -36px var(--c-glow); }
.insight.is-caught .state { color: var(--c); }
.insight.is-flash { animation: insightFlash 1.1s var(--ease); }
@keyframes insightFlash { 0% { box-shadow: 0 0 0 0 var(--c-glow); } 100% { box-shadow: 0 0 0 18px transparent; } }

/* ---------- ловушка ---------- */
.trap { margin-block: 2em; padding: 20px 24px; border-radius: var(--r); background: var(--bg-1); border: 1px solid var(--line); border-left: 3px solid var(--bad); }
.trap__tag { display: flex; align-items: center; gap: 9px; font: 600 11px/1 var(--f-mono); letter-spacing: .16em; text-transform: uppercase; color: var(--bad); }
.trap__tag svg { width: 15px; height: 15px; }
.trap p { margin: 10px 0 0; color: var(--text-body); font-size: 17px; line-height: 1.6; }
.trap p strong { color: var(--text); }

/* ---------- вопрос внутри текста ---------- */
.qa { margin-block: 2em; border-radius: var(--r); border: 1px solid var(--line-2); background: var(--bg-1); overflow: hidden; }
.qa__q { display: flex; gap: 14px; padding: 18px 22px; font: 500 17px/1.45 var(--f-text); color: var(--text); border-bottom: 1px solid var(--line); }
.qa__q::before { content: "?"; flex: none; width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; background: var(--c-soft); color: var(--c); font: 700 14px var(--f-mono); margin-top: -1px; }
.qa__a { padding: 16px 22px 18px 62px; color: var(--text-2); font-size: 16px; line-height: 1.65; }
.qa__a p { margin: 0 0 .7em; } .qa__a p:last-child { margin: 0; }
.qa__a strong { color: var(--text); }

/* ---------- схема и интерактив ---------- */
.fig, .viz { margin-block: 2.6em; }
.fig__frame, .viz__frame { position: relative; border-radius: var(--r-l); border: 1px solid var(--line); background: var(--bg-1); overflow: hidden; }
.fig__frame { padding: 24px; }
.fig figcaption, .viz figcaption { display: flex; gap: 12px; margin-top: 12px; font: 400 13.5px/1.5 var(--f-text); color: var(--text-3); }
.fig figcaption b, .viz figcaption b { flex: none; font: 600 12px/1.6 var(--f-mono); color: var(--c); letter-spacing: .04em; }
.viz__head { display: flex; align-items: center; gap: 12px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.viz__title { font: 600 14px var(--f-text); color: var(--text); }
.viz__badge { margin-left: auto; font: 500 11px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--c); display: inline-flex; align-items: center; gap: 7px; }
.viz__badge i { width: 7px; height: 7px; border-radius: 50%; background: var(--c); box-shadow: 0 0 0 4px var(--c-soft); animation: pulse 2s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 8px transparent; } }
.viz__stage { position: relative; padding: 22px; }
.viz__bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 14px 18px; border-top: 1px solid var(--line); background: color-mix(in oklab, var(--bg-1) 60%, var(--bg)); }
.viz__log { padding: 14px 18px 16px; border-top: 1px solid var(--line); font: 400 15px/1.55 var(--f-text); color: var(--text-2); min-height: 76px; }
.viz__log b { color: var(--text); font-weight: 600; }
.viz__log code { font: 500 .86em var(--f-mono); color: var(--text); background: var(--bg-2); border: 1px solid var(--line); border-radius: 5px; padding: .08em .35em; }

.vbtn {
  height: 36px; padding: 0 15px; border-radius: 99px; cursor: pointer;
  border: 1px solid var(--line-2); background: var(--bg-2); color: var(--text);
  font: 500 13.5px/1 var(--f-text); display: inline-flex; align-items: center; gap: 8px;
  transition: border-color .2s, background .2s, transform .15s, opacity .2s;
}
.vbtn:hover { border-color: var(--line-3); }
.vbtn:active { transform: scale(.97); }
.vbtn:disabled { opacity: .35; cursor: not-allowed; }
.vbtn code { font: 500 12px var(--f-mono); color: var(--text-2); }
.vbtn--accent { background: var(--c); color: #0a0a0a; border-color: transparent; font-weight: 600; }
.vbtn--accent code { color: #0a0a0a; }
.vbtn--ghost { background: transparent; }
.vbtn--push { margin-left: auto; }

/* ---------- шаги ---------- */
.steps { list-style: none; margin: 2em 0; padding: 0; counter-reset: s; }
.steps > li { position: relative; padding: 0 0 26px 54px; counter-increment: s; }
.steps > li::before {
  content: counter(s, decimal-leading-zero); position: absolute; left: 0; top: 0; width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center; font: 600 12px var(--f-mono); color: var(--c); background: var(--c-soft); border: 1px solid var(--c-line);
}
.steps > li::after { content: ""; position: absolute; left: 17px; top: 40px; bottom: 6px; width: 1px; background: var(--line-2); }
.steps > li:last-child { padding-bottom: 0; }
.steps > li:last-child::after { display: none; }
.steps b { display: block; color: var(--text); font-weight: 600; margin-bottom: 2px; padding-top: 5px; }

/* ---------- таблица ---------- */
.table-wrap { margin-block: 2em; overflow-x: auto; border-radius: var(--r); border: 1px solid var(--line); }
.table { width: 100%; border-collapse: collapse; font-size: 15px; line-height: 1.5; min-width: 520px; }
.table th { text-align: left; padding: 12px 16px; font: 600 11px var(--f-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--text-3); background: var(--bg-1); border-bottom: 1px solid var(--line-2); }
.table td { padding: 13px 16px; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--text-body); }
.table tr:last-child td { border-bottom: 0; }
.table td:first-child { color: var(--text); font-weight: 500; }

/* ---------- вопросы в конце главы ---------- */
.faq-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; flex-wrap: wrap; margin: 4em 0 18px; }
.faq-head h2 { margin: 0; font: 600 clamp(26px, 3.3vw, 38px)/1.1 var(--f-display); letter-spacing: -.03em; color: var(--text); }
.faq-head p { margin: 8px 0 0; color: var(--text-3); font-size: 15px; }
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  list-style: none; cursor: pointer; position: relative; display: flex; gap: 16px;
  padding: 18px 44px 18px 0; font: 500 16.5px/1.45 var(--f-text); color: var(--text); transition: color .2s;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .n { flex: none; width: 34px; padding-top: 2px; font: 500 12px var(--f-mono); color: var(--text-4); }
.faq summary::after {
  content: ""; position: absolute; right: 6px; top: 24px; width: 12px; height: 12px;
  background:
    linear-gradient(var(--text-3), var(--text-3)) center / 12px 1.5px no-repeat,
    linear-gradient(var(--text-3), var(--text-3)) center / 1.5px 12px no-repeat;
  transition: transform .3s var(--ease);
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details[open] summary .n { color: var(--c); }
.faq summary:hover { color: var(--text); }
.faq__a { padding: 0 0 22px 50px; color: var(--text-2); font-size: 16px; line-height: 1.7; }
.faq__a p { margin: 0 0 .7em; }
.faq__a strong { color: var(--text); }
.faq__go { display: inline-flex; align-items: center; gap: 6px; margin-top: 4px; font: 500 12.5px var(--f-mono); color: var(--c); text-decoration: none; }
.faq__go:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- следующая глава ---------- */
.next {
  position: relative; display: block; margin: 80px 0 0; padding: 34px 34px 32px; border-radius: var(--r-l);
  border: 1px solid var(--line-2); background: var(--bg-1); text-decoration: none; color: inherit; overflow: hidden;
  transition: border-color .3s, transform .4s var(--ease);
}
.next::before { content: ""; position: absolute; inset: 0; background: radial-gradient(600px 240px at 100% 100%, var(--c-soft), transparent 70%); opacity: .8; }
.next > * { position: relative; }
.next__label { font: 500 12px var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); }
.next__title { display: block; margin-top: 14px; font: 600 clamp(26px, 3.4vw, 42px)/1.05 var(--f-display); letter-spacing: -.035em; color: var(--text); }
.next__sub { display: block; margin-top: 10px; color: var(--text-2); }
.next__arr { position: absolute; right: 30px; top: 30px; width: 54px; height: 54px; border-radius: 50%; display: grid; place-items: center; border: 1px solid var(--line-2); transition: background .3s, color .3s, transform .4s var(--ease); }
.next__arr svg { width: 20px; height: 20px; }
a.next:hover { border-color: var(--c-line); transform: translateY(-2px); }
a.next:hover .next__arr { background: var(--c); color: #0a0a0a; border-color: transparent; transform: translateX(4px); }
.next--locked { cursor: default; border-style: dashed; }
.next--locked::before { display: none; }
.next--locked .next__title { color: transparent; -webkit-text-stroke: 1px var(--lock-2); }
.next--locked .next__arr { color: var(--text-4); }

/* ---------- оглавление-шторка ---------- */
.scrim { position: fixed; inset: 0; z-index: 70; background: rgba(0, 0, 0, .55); opacity: 0; pointer-events: none; transition: opacity .3s; }
.scrim.is-open { opacity: 1; pointer-events: auto; }
.drawer {
  position: fixed; top: 0; bottom: 0; left: 0; z-index: 80; width: min(380px, 88vw); overflow-y: auto;
  padding: 22px 22px 40px; background: var(--bg-1); border-right: 1px solid var(--line);
  transform: translateX(-102%); transition: transform .45s var(--ease);
}
.drawer.is-open { transform: none; }
.drawer__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 22px; }
.drawer__title { font: 500 12px var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); }
.toc { list-style: none; margin: 0; padding: 0; }
.toc a { display: flex; gap: 12px; padding: 10px 12px; border-radius: 10px; text-decoration: none; color: var(--text-2); font-size: 15px; line-height: 1.4; transition: background .2s, color .2s; }
.toc a:hover { background: var(--bg-2); color: var(--text); }
.toc a.is-active { color: var(--text); background: var(--bg-2); }
.toc a .n, .toc__soon .n { flex: none; font: 500 12px/1.6 var(--f-mono); color: var(--text-4); }
.toc a.is-active .n { color: var(--c); }
.toc a.is-current { box-shadow: inset 2px 0 0 var(--c); }
.toc__soon { display: flex; gap: 12px; padding: 10px 12px; font-size: 15px; line-height: 1.4; color: var(--text-4); cursor: default; }
.toc__ok { margin-left: auto; color: var(--c); font-size: 13px; }
/* дерево: главы темы и раскрывающиеся разделы */
.toc--tree > li + li { margin-top: 2px; }
.toc__row { display: flex; align-items: center; gap: 2px; }
.toc__row > a, .toc__row > .toc__soon { flex: 1; min-width: 0; }
.toc__tw { flex: none; width: 26px; height: 26px; padding: 0; border: 0; border-radius: 7px; background: none; color: var(--text-4); cursor: pointer; display: grid; place-items: center; }
.toc__tw:hover { background: var(--bg-2); color: var(--text); }
.toc__tw svg { width: 14px; height: 14px; transition: transform .2s var(--ease); }
.toc__ch.is-open > .toc__row .toc__tw svg { transform: rotate(90deg); }
.toc__ch.is-open > .toc__row .toc__tw { color: var(--c); }
.toc__sub { list-style: none; display: none; margin: 2px 0 10px 13px; padding: 0 0 0 14px; border-left: 1px solid var(--line-2); }
.toc__ch.is-open > .toc__sub { display: block; }
.toc__sub a { padding: 7px 10px; font-size: 14px; }
.toc__t { min-width: 0; }
.drawer__sub { margin: 30px 0 10px; padding: 0 12px; font: 500 12px var(--f-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); display: flex; justify-content: space-between; }
.drawer__sub a { color: var(--text-3); text-decoration: none; letter-spacing: .06em; }
.drawer__sub a:hover { color: var(--text); }

.ch-prev { margin-top: 18px; font: 500 13px var(--f-mono); }
.ch-prev a { color: var(--text-3); text-decoration: none; }
.ch-prev a:hover { color: var(--text); }

/* сноска-ссылка на главу */
.xref { display: inline-flex; align-items: center; gap: 6px; font: 500 .82em var(--f-mono); color: var(--c); text-decoration: none; white-space: nowrap; }
.xref:hover { text-decoration: underline; text-underline-offset: 3px; }

/* таблица-сетка коротких карточек (команды, ключи) */
.cards-mini, .prose .cards-mini { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 210px), 1fr)); gap: 8px; margin: 1.6em 0 2em; padding: 0; list-style: none; }
.cards-mini li { margin: 0; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line); background: var(--bg-1); font-size: 14.5px; line-height: 1.45; color: var(--text-2); }
.cards-mini li::marker { content: none; }
.cards-mini b { display: block; margin-bottom: 3px; font: 600 14px var(--f-mono); color: var(--c); }