:root {
  --bg:#f5f6fb; --bg-tint:#eceef7; --surface:#ffffff; --surface-2:#f8f9fd;
  --ink:#171a26; --ink-soft:#4a4f63; --ink-faint:#7b8098;
  --line:rgba(23,26,38,.10); --line-2:rgba(23,26,38,.16);
  --violet:#7c5cff; --violet-ink:#5b3fd6; --pink:#ff6f91;
  --verify:#17916b; --verify-bg:rgba(23,145,107,.10);
  --shadow:0 1px 2px rgba(23,26,38,.06),0 12px 40px rgba(23,26,38,.08);
  --shadow-lg:0 30px 80px rgba(23,26,38,.14);
  --serif:Georgia,"Times New Roman","PT Serif",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,"SF Mono","JetBrains Mono","Cascadia Code",Menlo,monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg:#080a12; --bg-tint:#0d1020; --surface:#141827; --surface-2:#171a2a;
    --ink:rgba(255,255,255,.94); --ink-soft:rgba(255,255,255,.66); --ink-faint:rgba(255,255,255,.44);
    --line:rgba(255,255,255,.11); --line-2:rgba(255,255,255,.20);
    --violet:#9d84ff; --violet-ink:#b6a4ff; --pink:#ff87a3;
    --verify:#3ddca5; --verify-bg:rgba(61,220,165,.12);
    --shadow:0 1px 2px rgba(0,0,0,.4),0 18px 50px rgba(0,0,0,.5);
    --shadow-lg:0 40px 100px rgba(0,0,0,.6);
  }
}
:root[data-theme="light"] {
  --bg:#f5f6fb; --bg-tint:#eceef7; --surface:#ffffff; --surface-2:#f8f9fd;
  --ink:#171a26; --ink-soft:#4a4f63; --ink-faint:#7b8098;
  --line:rgba(23,26,38,.10); --line-2:rgba(23,26,38,.16);
  --violet:#7c5cff; --violet-ink:#5b3fd6; --pink:#ff6f91;
  --verify:#17916b; --verify-bg:rgba(23,145,107,.10);
  --shadow:0 1px 2px rgba(23,26,38,.06),0 12px 40px rgba(23,26,38,.08);
  --shadow-lg:0 30px 80px rgba(23,26,38,.14);
}
:root[data-theme="dark"] {
  --bg:#080a12; --bg-tint:#0d1020; --surface:#141827; --surface-2:#171a2a;
  --ink:rgba(255,255,255,.94); --ink-soft:rgba(255,255,255,.66); --ink-faint:rgba(255,255,255,.44);
  --line:rgba(255,255,255,.11); --line-2:rgba(255,255,255,.20);
  --violet:#9d84ff; --violet-ink:#b6a4ff; --pink:#ff87a3;
  --verify:#3ddca5; --verify-bg:rgba(61,220,165,.12);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 18px 50px rgba(0,0,0,.5);
  --shadow-lg:0 40px 100px rgba(0,0,0,.6);
}

* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; background:var(--bg); color:var(--ink); font-family:var(--sans);
  line-height:1.6; -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility; }
.wrap { max-width:1180px; margin:0 auto; padding:0 28px; }
a { color:inherit; text-decoration:none; }
:focus-visible { outline:2px solid var(--violet); outline-offset:2px; border-radius:6px; }

/* topbar */
.topbar { position:sticky; top:0; z-index:40; backdrop-filter:saturate(160%) blur(14px);
  background:color-mix(in srgb, var(--bg) 82%, transparent); border-bottom:1px solid var(--line); }
.topbar__in { display:flex; align-items:center; gap:18px; height:62px; }
.logo { display:flex; align-items:baseline; gap:2px; font-weight:800; letter-spacing:-.03em; font-size:18px; }
.logo .dot { color:var(--violet); }
.kicker { font-family:var(--mono); font-size:11px; letter-spacing:.12em; text-transform:uppercase;
  color:var(--ink-faint); border:1px solid var(--line); border-radius:999px; padding:5px 10px; }
.topnav { margin-left:auto; display:flex; gap:6px; align-items:center; }
.topnav a { font-size:13.5px; color:var(--ink-soft); padding:7px 11px; border-radius:9px; }
.topnav a:hover, .topnav a.on { color:var(--ink); background:var(--surface-2); }
.stand { font-family:var(--mono); font-size:12px; color:var(--ink-soft); border:1px solid var(--line);
  border-radius:9px; padding:6px 10px; display:flex; gap:8px; align-items:center; }
.stand b { color:var(--ink); font-weight:600; }
.stand .live { width:7px; height:7px; border-radius:50%; background:var(--verify); box-shadow:0 0 0 3px var(--verify-bg); }
.tglbtn { cursor:pointer; border:1px solid var(--line); background:var(--surface-2); color:var(--ink-soft);
  width:34px; height:34px; border-radius:9px; font-size:15px; display:grid; place-items:center; }
.tglbtn:hover { color:var(--ink); }

/* hero */
.hero { padding:66px 0 40px; position:relative; overflow:hidden; }
.hero::before { content:""; position:absolute; inset:-40% 30% auto -10%; height:520px;
  background:radial-gradient(60% 60% at 30% 30%, color-mix(in srgb, var(--violet) 22%, transparent), transparent 70%);
  filter:blur(10px); pointer-events:none; z-index:0; }
.hero__in { position:relative; z-index:1; }
.eyebrow { font-family:var(--mono); font-size:12px; letter-spacing:.16em; text-transform:uppercase;
  color:var(--violet-ink); display:flex; align-items:center; gap:10px; margin-bottom:20px; }
.eyebrow::before { content:""; width:28px; height:1px; background:var(--violet); }
h1.hero__title { margin:0; font-size:clamp(32px,4.4vw,54px); line-height:1.04; letter-spacing:-.035em;
  font-weight:800; text-wrap:balance; max-width:20ch; }
.hero__sub { margin:20px 0 0; max-width:64ch; font-size:16.5px; color:var(--ink-soft); }
.hero__sub b, .hero__sub strong { color:var(--ink); font-weight:600; }
.claims { margin-top:32px; display:flex; flex-wrap:wrap; gap:10px; }
.claim { display:flex; align-items:center; gap:7px; padding:9px 13px; border-radius:11px;
  border:1px solid var(--line); background:var(--surface); box-shadow:var(--shadow); font-size:13.5px; }
.claim svg { width:15px; height:15px; flex:none; }
.claim.is-verify { border-color:color-mix(in srgb, var(--verify) 40%, var(--line)); }
.claim.is-verify svg { color:var(--verify); }
.claim b { font-weight:600; }

/* shell: rail + main (+ onthis) */
.shell { display:grid; grid-template-columns:236px 1fr; gap:44px; padding:40px 0 20px; align-items:start; }
.shell--doc { grid-template-columns:236px minmax(0,1fr) 210px; gap:40px; }
.rail { position:sticky; top:82px; }
.rail__label { font-family:var(--mono); font-size:11px; letter-spacing:.14em; text-transform:uppercase;
  color:var(--ink-faint); padding:0 12px 10px; }
.rail ol { list-style:none; margin:0; padding:0; counter-reset:none; }
.rail li a { display:flex; gap:12px; align-items:baseline; padding:8px 12px; border-radius:9px;
  color:var(--ink-soft); font-size:13.5px; border-left:2px solid transparent; transition:.15s; }
.rail li a:hover { background:var(--surface-2); color:var(--ink); }
.rail li a.active { color:var(--ink); background:var(--surface-2); border-left-color:var(--violet); font-weight:600; }
.rail li a .rn { font-family:var(--mono); font-size:11px; color:var(--ink-faint); min-width:18px; }
.rail__foot { margin-top:18px; padding:14px 12px 0; border-top:1px solid var(--line); }
.rail__foot a { font-size:12.5px; color:var(--violet-ink); font-family:var(--mono); }

/* portal blocks */
.stack-gap { display:grid; gap:40px; }
.block { scroll-margin-top:84px; }
.block__head { margin-bottom:22px; }
.block__title { margin:0; font-size:24px; letter-spacing:-.02em; font-weight:700; }
.block__desc { margin:8px 0 0; color:var(--ink-soft); font-size:15px; max-width:66ch; }

.docs { display:grid; grid-template-columns:repeat(2,1fr); gap:14px; }
.doc { position:relative; display:block; padding:20px 20px 18px; border-radius:14px;
  border:1px solid var(--line); background:var(--surface); box-shadow:var(--shadow);
  transition:transform .18s ease, border-color .18s ease, box-shadow .18s ease; overflow:hidden; }
.doc::after { content:""; position:absolute; left:0; top:0; bottom:0; width:3px;
  background:linear-gradient(var(--violet),var(--pink)); opacity:0; transition:opacity .18s; }
.doc:hover { transform:translateY(-3px); border-color:var(--line-2); box-shadow:var(--shadow-lg); }
.doc:hover::after { opacity:1; }
.doc__num { font-family:var(--serif); font-size:30px; line-height:1; color:var(--ink-faint); font-weight:700; }
.doc:hover .doc__num { color:var(--violet); }
.doc__title { margin:12px 0 6px; font-size:16px; font-weight:600; letter-spacing:-.01em; line-height:1.25; }
.doc__purpose { margin:0; font-size:13.5px; color:var(--ink-soft); line-height:1.5; }
.doc__meta { margin-top:14px; display:flex; gap:8px; align-items:center; }
.tag { font-family:var(--mono); font-size:10.5px; letter-spacing:.06em; text-transform:uppercase;
  color:var(--ink-faint); border:1px solid var(--line); border-radius:6px; padding:3px 7px; }
.doc__meta .pp { margin-left:auto; font-size:11.5px; color:var(--ink-faint); }
.mono { font-family:var(--mono); }

.caps { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
.cap { padding:18px; border:1px solid var(--line); border-radius:13px; background:var(--surface); box-shadow:var(--shadow); }
.cap__ic { width:34px; height:34px; border-radius:9px; display:grid; place-items:center;
  background:color-mix(in srgb, var(--violet) 12%, transparent); color:var(--violet-ink); margin-bottom:12px; }
.cap__ic svg { width:18px; height:18px; }
.cap h4 { margin:0 0 6px; font-size:15px; font-weight:600; letter-spacing:-.01em; }
.cap p { margin:0; font-size:13.5px; color:var(--ink-soft); line-height:1.5; }

/* doc article */
.article { min-width:0; }
.crumbs { display:flex; flex-wrap:wrap; gap:8px; align-items:center; font-size:13px; color:var(--ink-faint);
  margin:6px 0 20px; }
.crumbs a { color:var(--violet-ink); }
.crumbs__n { color:var(--ink-soft); }

/* prose typography */
.prose { max-width:74ch; }
.prose h1 { font-family:var(--serif); font-weight:700; font-size:clamp(26px,3.2vw,36px); line-height:1.1;
  letter-spacing:-.01em; margin:0 0 8px; text-wrap:balance; }
.prose h2 { position:relative; font-size:21px; font-weight:700; letter-spacing:-.01em; line-height:1.25;
  margin:44px 0 14px; padding-top:20px; border-top:1px solid var(--line); scroll-margin-top:80px; }
.prose h3 { font-size:16.5px; font-weight:600; margin:28px 0 10px; scroll-margin-top:80px; }
.prose h4 { font-size:14.5px; font-weight:600; margin:22px 0 8px; color:var(--ink-soft); }
.prose p { margin:0 0 15px; color:var(--ink-soft); font-size:15.5px; }
.prose strong { color:var(--ink); font-weight:600; }
.prose a:not(.anchor) { color:var(--violet-ink); text-decoration:underline; text-underline-offset:2px;
  text-decoration-color:color-mix(in srgb, var(--violet) 40%, transparent); }
.prose a:not(.anchor):hover { text-decoration-color:var(--violet); }
.prose ul, .prose ol { margin:0 0 16px; padding-left:22px; color:var(--ink-soft); font-size:15.5px; }
.prose li { margin:6px 0; }
.prose li::marker { color:var(--ink-faint); }
.prose hr { border:none; border-top:1px solid var(--line); margin:34px 0; }
.prose blockquote { margin:18px 0; padding:12px 18px; border-left:3px solid var(--violet);
  background:color-mix(in srgb, var(--violet) 7%, var(--surface-2)); border-radius:0 10px 10px 0; }
.prose blockquote p { margin:0; color:var(--ink-soft); }
.prose code { font-family:var(--mono); font-size:.88em; background:var(--surface-2);
  border:1px solid var(--line); border-radius:6px; padding:1px 6px; color:var(--ink); }
.prose pre { background:var(--surface-2); border:1px solid var(--line); border-radius:12px;
  padding:16px 18px; overflow-x:auto; margin:0 0 18px; }
.prose pre code { background:none; border:none; padding:0; font-size:13px; }
.anchor { position:absolute; left:-1.1em; color:var(--ink-faint); text-decoration:none; opacity:0;
  font-weight:400; transition:opacity .15s; }
.prose h2:hover .anchor { opacity:1; }

/* tables */
.table-wrap { overflow-x:auto; margin:0 0 20px; border:1px solid var(--line); border-radius:12px; }
.prose table { border-collapse:collapse; width:100%; font-size:14px; }
.prose thead th { text-align:left; background:var(--surface-2); color:var(--ink);
  font-weight:600; font-size:12.5px; letter-spacing:.02em; padding:11px 14px; border-bottom:1px solid var(--line-2); }
.prose tbody td { padding:11px 14px; border-bottom:1px solid var(--line); color:var(--ink-soft); vertical-align:top; }
.prose tbody tr:last-child td { border-bottom:none; }
.prose tbody tr:hover td { background:var(--surface-2); }
.prose td strong { color:var(--ink); }

/* figures (schemas) — светлая «печатная» плашка в любой теме */
.prose img { display:block; max-width:100%; height:auto; margin:8px 0 10px; border-radius:12px;
  background:#fff; padding:14px; border:1px solid var(--line); box-shadow:var(--shadow); }
.prose p > em { display:block; font-size:13px; color:var(--ink-faint); font-style:normal;
  margin:0 0 22px; padding-left:2px; }
.prose img + em, .prose img ~ em { }

/* on this page */
.onthis { position:sticky; top:82px; }
.onthis__box { border-left:1px solid var(--line); padding-left:16px; }
.onthis__label { font-family:var(--mono); font-size:11px; letter-spacing:.12em; text-transform:uppercase;
  color:var(--ink-faint); margin-bottom:10px; }
.onthis ul { list-style:none; margin:0; padding:0; }
.onthis li a { display:block; font-size:12.5px; color:var(--ink-soft); padding:4px 0; line-height:1.35;
  border-left:2px solid transparent; padding-left:10px; margin-left:-11px; transition:.15s; }
.onthis li a:hover, .onthis li a.active { color:var(--ink); border-left-color:var(--violet); }

/* prev / next */
.prevnext { display:grid; grid-template-columns:1fr 1fr; gap:14px; margin:44px 0 8px;
  padding-top:24px; border-top:1px solid var(--line); }
.pn { display:flex; flex-direction:column; gap:4px; padding:14px 16px; border:1px solid var(--line);
  border-radius:12px; background:var(--surface); box-shadow:var(--shadow); transition:.15s; }
.pn:hover { border-color:var(--line-2); transform:translateY(-2px); box-shadow:var(--shadow-lg); }
.pn--next { text-align:right; }
.pn__k { font-family:var(--mono); font-size:11px; letter-spacing:.06em; text-transform:uppercase; color:var(--ink-faint); }
.pn__t { font-size:14px; font-weight:600; color:var(--ink); }

/* footer */
footer { border-top:1px solid var(--line); margin-top:56px; padding:34px 0 60px; }
.foot { display:flex; flex-wrap:wrap; gap:12px 18px; align-items:center; color:var(--ink-faint); font-size:13px; }
.foot .logo { font-size:15px; }
.foot__sep { opacity:.5; }
.foot .mono { font-size:12px; }

@media (max-width:1040px) { .shell--doc { grid-template-columns:220px minmax(0,1fr); } .onthis { display:none; } }
@media (max-width:880px) {
  .shell, .shell--doc { grid-template-columns:1fr; gap:24px; }
  .rail { position:static; }
  .rail ol { display:flex; flex-wrap:wrap; gap:6px; }
  .rail li a { border-left:none; border:1px solid var(--line); }
  .docs, .caps { grid-template-columns:1fr; }
  .prevnext { grid-template-columns:1fr; }
  .topnav a { display:none; }
  .topnav .stand, .topnav .tglbtn { display:flex; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior:auto; } * { transition:none !important; } }