/* Signatum — база знаний. Стиль лендинга: Inter, чёрно-белая палитра, тёмная тема через [data-theme="dark"]. */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --black: #0a0a0a; --text: #26261f; --gray: #6b6b68; --gray2: #45453f; --light: #f5f5f4;
  --border: #e5e5e3; --border2: #ededeb; --bg: #ffffff; --nav: rgba(255,255,255,.95);
  --accent: #3866d6; --callout: #eaf1ff; --callout-b: #b9cdf7; --callout-t: #1d3266;
}
[data-theme="dark"] {
  --black: #f0f0f0; --text: #d9d9d6; --gray: #8f8f8a; --gray2: #b0b0aa; --light: #1d1d1c;
  --border: #333; --border2: #2a2a29; --bg: #111; --nav: rgba(17,17,17,.96);
  --accent: #7ea3ff; --callout: #16223d; --callout-b: #2e4a86; --callout-t: #d6e2ff;
}
html { scroll-behavior: smooth; }
body { font-family: Inter, 'Helvetica Neue', Arial, sans-serif; background: var(--bg); color: var(--black); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img { max-width: 100%; display: block; }

/* шапка */
.kb-nav { position: sticky; top: 0; z-index: 50; height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 0 56px; background: var(--nav); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.kb-logo { font-size: 19px; font-weight: 900; font-style: italic; letter-spacing: -.4px; text-decoration: none; color: var(--black); }
.kb-nav__links { display: flex; align-items: center; gap: 4px; }
.kb-nav__link { padding: 8px 14px; font-size: 14px; font-weight: 500; white-space: nowrap; color: var(--gray); text-decoration: none; border-radius: 8px; }
.kb-nav__link:hover { color: var(--black); background: var(--light); }
.kb-nav__link.is-active { color: var(--black); font-weight: 700; }
.kb-nav__btn { margin-left: 6px; padding: 9px 18px; font-size: 14px; font-weight: 700; color: var(--bg); background: var(--black); border-radius: 8px; text-decoration: none; white-space: nowrap; }
.kb-theme { width: 32px; height: 32px; margin: 0 4px; border-radius: 6px; border: 1px solid var(--border); background: transparent; color: var(--gray); cursor: pointer; font: inherit; font-size: 15px; }

/* общая сетка */
.kb-wrap { max-width: 1168px; margin: 0 auto; padding: 32px 24px 96px; }
.kb-crumbs { font-size: 13px; color: var(--gray); display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.kb-crumbs a { color: var(--gray); text-decoration: none; }
.kb-crumbs a:hover { color: var(--black); }
.kb-back { display: inline-block; font-size: 13px; font-weight: 600; color: var(--gray); text-decoration: none; margin-bottom: 20px; }
.kb-back:hover { color: var(--black); }
.kb-kicker { font-size: 11px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--gray); margin-bottom: 14px; }
.kb-h1 { font-size: clamp(34px, 4.6vw, 52px); line-height: 1.04; font-weight: 900; letter-spacing: -1.8px; }
.kb-h1 em { font-style: italic; color: var(--gray); }

/* каталог */
.kb-hero { display: flex; justify-content: space-between; align-items: flex-end; gap: 40px; margin-bottom: 40px; }
.kb-hero > div { max-width: 760px; }
.kb-hero__sub { margin-top: 16px; font-size: 16px; line-height: 1.6; color: var(--gray2); }
.kb-search { flex: none; width: 300px; display: flex; align-items: center; gap: 10px; padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px; color: var(--gray); }
.kb-search input { border: 0; outline: 0; background: transparent; font: 400 15px Inter, sans-serif; color: var(--black); width: 100%; }
.kb-search:focus-within { border-color: var(--black); }
.kb-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.kb-card { display: flex; flex-direction: column; border: 1px solid var(--border); border-radius: 14px; overflow: hidden; text-decoration: none; color: var(--black); background: var(--bg); transition: border-color .15s, transform .15s; }
.kb-card:hover { border-color: var(--black); transform: translateY(-2px); }
.kb-card__media { position: relative; aspect-ratio: 16 / 9; background: var(--light); border-bottom: 1px solid var(--border2); overflow: hidden; }
.kb-card__media img { width: 100%; height: 100%; object-fit: cover; }
.kb-play { position: absolute; left: 14px; bottom: 14px; width: 48px; height: 48px; border-radius: 50%; background: #0a0a0a; color: #fff; display: flex; align-items: center; justify-content: center; box-shadow: 0 6px 20px rgba(0,0,0,.25); transition: transform .15s; }
.kb-play svg { margin-left: 3px; }
.kb-card:hover .kb-play { transform: scale(1.08); }
.kb-dur { position: absolute; right: 12px; bottom: 12px; font-size: 12px; font-weight: 700; background: #0a0a0a; color: #fff; padding: 3px 8px; border-radius: 5px; }
.kb-card__body { padding: 22px 24px 26px; display: flex; flex-direction: column; gap: 10px; }
.kb-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--gray); }
.kb-badge { color: var(--bg); background: var(--black); padding: 3px 7px; border-radius: 4px; letter-spacing: .08em; }
.kb-card__title { font-size: 24px; line-height: 1.15; font-weight: 800; letter-spacing: -.6px; }
.kb-card__text { font-size: 15px; line-height: 1.55; color: var(--gray2); }
.kb-empty { margin-top: 24px; color: var(--gray); }
.kb-cta { margin-top: 56px; display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 32px 36px; border-radius: 16px; background: #0a0a0a; color: #fff; }
.kb-cta h2 { font-size: 28px; font-weight: 900; letter-spacing: -.8px; }
.kb-cta p { margin-top: 6px; color: #b0b0aa; font-size: 15px; }
.kb-btn { flex: none; padding: 14px 26px; border-radius: 9px; background: #fff; color: #0a0a0a; font-weight: 700; font-size: 15px; text-decoration: none; }

/* статья */
.kb-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; }
.kb-head .kb-h1 { max-width: 860px; }
.kb-head__meta { flex: none; text-align: right; font-size: 13px; line-height: 1.6; color: var(--gray); }
.kb-lead { margin: 18px 0 28px; max-width: 820px; font-size: 19px; line-height: 1.55; color: var(--gray2); }
.kb-video { border: 1px solid var(--border); border-radius: 14px; overflow: hidden; background: #0a0a0a; }
.kb-video video { display: block; width: 100%; aspect-ratio: 16 / 9; background: #fafaf9; }
.kb-video video::cue { font-family: Inter, sans-serif; font-size: 18px; background: rgba(10,10,10,.86); }
.kb-chapters { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.kb-chap { font: 500 13px Inter, sans-serif; color: var(--gray2); background: transparent; border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; cursor: pointer; text-align: left; }
.kb-chap b { color: var(--black); font-variant-numeric: tabular-nums; margin-right: 4px; }
.kb-chap:hover { border-color: var(--gray); }
.kb-chap.is-on { border: 1.5px solid var(--black); color: var(--black); font-weight: 600; }

.kb-layout { display: grid; grid-template-columns: 220px minmax(0, 700px); gap: 72px; margin-top: 56px; }
.kb-toc { position: sticky; top: 92px; align-self: start; display: flex; flex-direction: column; gap: 2px; max-height: calc(100vh - 110px); overflow: auto; }
.kb-toc__title { font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--gray); margin-bottom: 10px; }
.kb-toc__link { font-size: 13px; line-height: 1.4; color: var(--gray); text-decoration: none; padding: 6px 0 6px 12px; border-left: 2px solid var(--border2); }
.kb-toc__link:hover { color: var(--black); }
.kb-toc__link.is-on { color: var(--black); font-weight: 700; border-left-color: var(--black); }

.kb-article { min-width: 0; font-size: 16.5px; line-height: 1.68; color: var(--text); }
.kb-summary { background: var(--light); border-radius: 12px; padding: 22px 26px; margin-bottom: 40px; scroll-margin-top: 92px; }
.kb-summary__title { font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--gray); margin-bottom: 8px; }
.kb-summary ul { padding-left: 18px; display: flex; flex-direction: column; gap: 6px; }
.kb-body h2, .kb-faq h2 { font-size: 27px; line-height: 1.2; font-weight: 800; letter-spacing: -.7px; color: var(--black); margin: 44px 0 14px; scroll-margin-top: 92px; }
.kb-body h3 { font-size: 19px; font-weight: 800; color: var(--black); margin: 28px 0 10px; }
.kb-body p { margin: 0 0 14px; }
.kb-body ul, .kb-body ol { margin: 0 0 16px; padding-left: 22px; display: flex; flex-direction: column; gap: 7px; }
.kb-body strong, .kb-body b { color: var(--black); }
.kb-body a { color: var(--black); text-decoration-color: var(--gray); text-underline-offset: 3px; }
.kb-body code { font-size: .88em; background: var(--light); border-radius: 4px; padding: 1px 5px; }
.kb-table { overflow-x: auto; margin: 6px 0 20px; }
.kb-table table { border-collapse: collapse; width: 100%; font-size: 14.5px; line-height: 1.45; }
.kb-table th { text-align: left; font-weight: 700; color: var(--black); padding: 10px 12px; border-bottom: 1.5px solid var(--black); white-space: nowrap; }
.kb-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.kb-callout { margin: 6px 0 20px; padding: 16px 18px; border-radius: 10px; background: var(--callout); border: 1px solid var(--callout-b); color: var(--callout-t); font-size: 15px; line-height: 1.6; }
.kb-callout p { margin: 0; }
.kb-callout strong { color: inherit; }
.kb-faq { margin-top: 20px; border-top: 1px solid var(--border); scroll-margin-top: 92px; }
.kb-faq details { border-bottom: 1px solid var(--border); padding: 16px 0; }
.kb-faq summary { cursor: pointer; font-weight: 700; color: var(--black); list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.kb-faq summary::-webkit-details-marker { display: none; }
.kb-faq summary::after { content: "+"; font-weight: 400; font-size: 22px; line-height: 1; color: var(--gray); transition: transform .15s; }
.kb-faq details[open] summary::after { transform: rotate(45deg); }
.kb-faq details p { margin-top: 10px; color: var(--gray2); }
.kb-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 48px; }
.kb-pager__item { display: flex; flex-direction: column; gap: 4px; padding: 18px 20px; border: 1px solid var(--border); border-radius: 12px; text-decoration: none; color: var(--black); }
.kb-pager__item span { font-size: 12px; color: var(--gray); }
.kb-pager__item b { font-size: 16px; line-height: 1.3; }
.kb-pager__item:hover { border-color: var(--black); }
.kb-pager__item.is-right { text-align: right; }
.kb-pager__item.is-black { background: #0a0a0a; color: #fff; border-color: #0a0a0a; }
.kb-pager__item.is-black span { color: #b0b0aa; }

/* подвал */
.kb-footer { border-top: 1px solid var(--border); padding: 40px 56px; background: var(--bg-alt, #f5f5f3); }
.kb-footer__grid { max-width: 1280px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1.4fr 1.4fr 1fr; gap: 32px; align-items: start; }
.kb-footer__logo { font-size: 17px; font-weight: 900; font-style: italic; letter-spacing: -0.3px; color: var(--text, #0a0a0a); display: block; margin-bottom: 10px; text-decoration: none; }
.kb-footer__copy { font-size: 12px; color: var(--gray); opacity: .65; }
.kb-footer__col-title { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--gray); opacity: .7; display: block; margin-bottom: 10px; }
.kb-footer__links { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 7px; }
.kb-footer__links a { font-size: 13px; color: var(--gray); text-decoration: none; transition: color .15s; }
.kb-footer__links a:hover { color: var(--black, #0a0a0a); }
.kb-footer__tg { color: #229ED9 !important; }

[data-theme="dark"] .kb-video video { background: #111; }

/* адаптив */
@media (max-width: 1024px) {
  .kb-layout { grid-template-columns: minmax(0, 1fr); gap: 0; margin-top: 40px; }
  .kb-toc { display: none; }
  .kb-hide-sm { display: none; }
}
@media (max-width: 768px) {
  .kb-nav { padding: 0 16px; height: 60px; }
  .kb-wrap { padding: 20px 16px 72px; }
  .kb-hero, .kb-head { flex-direction: column; align-items: stretch; gap: 20px; }
  .kb-head__meta { text-align: left; }
  .kb-search { width: 100%; }
  .kb-grid { grid-template-columns: 1fr; gap: 16px; }
  .kb-card__title { font-size: 21px; }
  .kb-lead { font-size: 17px; }
  .kb-cta { flex-direction: column; align-items: flex-start; padding: 26px 22px; }
  .kb-pager { grid-template-columns: 1fr; }
  .kb-footer { padding: 32px 16px; }
  .kb-footer__grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  @media (max-width: 480px) {
    .kb-footer__grid { grid-template-columns: 1fr; gap: 18px; }
  }
  .kb-video { border-radius: 10px; margin: 0 -16px; border-left: 0; border-right: 0; border-radius: 0; }
}
@media (max-width: 420px) {
  .kb-hide-xs { display: none; }
  .kb-nav__link { padding: 8px 8px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .kb-card, .kb-play { transition: none; } }