/* =========================================================================
   3L · /blog — стили блога (индекс + статья)
   -------------------------------------------------------------------------
   План plans/2026-10-02-3l-own-seo.md, Фаза 4. Только токены дизайн-системы
   (/styles/tokens.css) поверх main.css + sections.css — шапка и подвал те же,
   что на страницах услуг. Префикс .blog-*; классы тела (.steps, .callout,
   .compare, .stat, .sources) приходят из разборщика выгрузки консоли
   (site/api/_seo/export.js) и стилизуются только внутри .blog-prose.

   Идея страницы: тёмная шапка с заголовком и «Коротко», обложка в рамке
   знака 3L (четыре угла aperture, нижний левый — lime) лежит на стыке тёмного
   и светлого, текст — на cream, как бумага. Lime на cream — только графикой
   (feedback_brand_visual_rules): на светлом акцент — petrol.
   ========================================================================= */

.blog-page { --blog-nav: 64px; --blog-overlap: clamp(72px, 11vw, 190px); }

.blog-wrap {
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  padding-inline: var(--gutter);
  box-sizing: border-box;
}

.blog-page a:focus-visible,
.blog-page summary:focus-visible,
.blog-page .compare:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}
.blog-paper a:focus-visible,
.blog-paper summary:focus-visible,
.blog-paper .compare:focus-visible { outline-color: var(--color-accent-deep); }

/* ------------------------------------------------------------- шапка */
.blog-hero {
  padding-top: calc(var(--blog-nav) + var(--space-7));
  padding-bottom: var(--space-7);
  position: relative;
}
.blog-hero:not(.blog-hero--index) { padding-bottom: 0; }

.blog-crumbs {
  font-family: var(--font-body);
  font-size: var(--fs-body-s);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}
.blog-crumbs ol {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
}
.blog-crumbs li { min-width: 0; }
.blog-crumbs a { color: var(--color-text-muted); transition: color var(--dur-fast) var(--ease-default); }
.blog-crumbs a:hover { color: var(--color-accent); }
.blog-crumbs [aria-current="page"] {
  color: var(--color-text);
  max-width: 48ch;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.blog-crumbs-sep { color: var(--color-text-muted); opacity: .5; }

.blog-meta { display: flex; flex-wrap: wrap; gap: 6px 10px; }

.blog-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(36px, 5.4vw, 88px);
  line-height: 1.0;
  letter-spacing: -0.028em;
  max-width: 17ch;
  margin: 0 0 var(--space-6);
  text-wrap: balance;
  hyphens: auto;
  overflow-wrap: break-word;
}
.blog-title em,
.blog-cta-title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--color-accent);
}

/* «Коротко» — абзац, который цитирует ассистент; держим его отдельным блоком. */
.blog-tldr {
  display: grid;
  grid-template-columns: minmax(120px, 200px) minmax(0, 62ch);
  gap: var(--space-3) var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  position: relative;
  max-width: 980px;
}
.blog-tldr::before {
  content: "";
  position: absolute; top: -1px; left: 0;
  width: 72px; height: 2px;
  background: var(--color-accent);
}
.blog-tldr-label {
  font-family: var(--font-body);
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent);
  padding-top: 6px;
}
.blog-tldr-text {
  font-family: var(--font-body);
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: 1.55;
  color: var(--color-text);
}

/* Обложка в рамке знака: четыре угла aperture, нижний левый — сигнальный. */
.blog-cover {
  position: relative;
  z-index: 1;
  max-width: calc(1080px + 2 * var(--gutter));
  margin-top: var(--space-8);
  margin-bottom: calc(-1 * var(--blog-overlap));
}
.blog-cover img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  background: var(--color-base-soft);
}
.blog-cover-frame {
  position: absolute;
  --off: clamp(6px, 1.2vw, 16px);
  inset: calc(-1 * var(--off)) calc(var(--gutter) - var(--off));
  pointer-events: none;
}
.blog-cover-frame i {
  position: absolute;
  width: clamp(22px, 3vw, 44px);
  height: clamp(22px, 3vw, 44px);
  border: 0 solid var(--color-text);
}
.blog-cover-frame i:nth-child(1) { top: 0; left: 0; border-top-width: 3px; border-left-width: 3px; }
.blog-cover-frame i:nth-child(2) { top: 0; right: 0; border-top-width: 3px; border-right-width: 3px; }
.blog-cover-frame i:nth-child(3) { bottom: 0; right: 0; border-bottom-width: 3px; border-right-width: 3px; border-color: var(--color-text-invert); }
.blog-cover-frame i:nth-child(4) { bottom: 0; left: 0; border-bottom-width: 3px; border-left-width: 3px; border-color: var(--color-accent); }

/* ----------------------------------------------------- «бумага» (cream) */
.blog-paper {
  background: var(--color-surface);
  color: var(--color-text-invert);
  padding-top: calc(var(--blog-overlap) + var(--space-8));
  padding-bottom: var(--space-9);
}
.blog-paper--index { padding-top: var(--space-6); }

.blog-grid {
  display: grid;
  grid-template-columns: minmax(180px, 240px) minmax(0, 68ch);
  gap: clamp(32px, 7vw, 140px);
  align-items: start;
}

.blog-rail {
  position: sticky;
  top: calc(var(--blog-nav) + var(--space-5));
  display: grid;
  gap: var(--space-6);
  font-family: var(--font-body);
  font-size: var(--fs-body-s);
}
.blog-rail-label {
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent-deep);
  margin-bottom: var(--space-3);
}
.blog-toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; counter-reset: toc; }
.blog-toc li { counter-increment: toc; display: grid; grid-template-columns: 2.2em 1fr; }
.blog-toc li::before {
  content: counter(toc, decimal-leading-zero);
  color: var(--color-text-invert-muted);
  font-variant-numeric: tabular-nums;
}
.blog-toc a {
  color: var(--color-text-invert);
  line-height: 1.35;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
  transition: text-decoration-color var(--dur-fast) var(--ease-default);
}
.blog-toc a:hover { text-decoration-color: var(--color-accent-deep); }
.blog-rail-svc { padding-top: var(--space-4); border-top: 1px solid var(--color-line-invert); }
.blog-rail-link {
  font-family: var(--font-display);
  font-size: var(--fs-h4);
  font-weight: 500;
  color: var(--color-text-invert);
  display: inline-flex; gap: 8px; align-items: baseline;
}
.blog-rail-link span { color: var(--color-accent-deep); transition: transform var(--dur-fast) var(--ease-default); }
.blog-rail-link:hover span { transform: translate(2px, -2px); }

/* --------------------------------------------------------------- текст */
.blog-prose {
  font-family: var(--font-body);
  font-size: clamp(17px, 1.3vw, 19px);
  line-height: 1.68;
  letter-spacing: -0.003em;
  min-width: 0;
  overflow-wrap: break-word;
}
.blog-prose > :first-child { margin-top: 0; }
.blog-prose p { margin: 0 0 1.1em; }
.blog-prose h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(27px, 2.7vw, 40px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 2.2em 0 0.7em;
  scroll-margin-top: calc(var(--blog-nav) + var(--space-4));
  text-wrap: balance;
}
.blog-prose h2::before {
  content: "";
  display: block;
  width: 28px; height: 2px;
  background: var(--color-accent-deep);
  margin-bottom: var(--space-4);
}
.blog-prose h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(21px, 1.8vw, 26px);
  line-height: 1.2;
  margin: 1.8em 0 0.5em;
}
.blog-prose strong { font-weight: var(--fw-semibold); }
.blog-prose a {
  color: var(--color-accent-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.blog-prose a:hover { text-decoration-thickness: 2px; }
.blog-prose ul,
.blog-prose ol:not(.steps) { margin: 0 0 1.2em; padding-left: 0; }
.blog-prose ul { list-style: none; }
.blog-prose ul li { position: relative; padding-left: 28px; margin-bottom: 0.5em; }
.blog-prose ul li::before {
  content: ""; position: absolute; left: 0; top: 0.8em;
  width: 14px; height: 2px; background: var(--color-accent-deep);
}
.blog-prose ol:not(.steps) { padding-left: 1.4em; }
.blog-prose ol:not(.steps) li { margin-bottom: 0.5em; padding-left: 4px; }
.blog-prose .claim { color: inherit; }

/* Steps — нумерованные шаги чек-листа. */
.blog-prose .steps {
  list-style: none;
  margin: var(--space-5) 0 var(--space-6);
  padding: 0;
  counter-reset: step;
  border-bottom: 1px solid var(--color-line-invert);
}
.blog-prose .steps > li {
  counter-increment: step;
  display: grid;
  grid-template-columns: clamp(44px, 6vw, 72px) minmax(0, 1fr);
  gap: 0 var(--space-3);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-line-invert);
}
.blog-prose .steps > li::before {
  content: counter(step, decimal-leading-zero);
  grid-row: span 2;
  font-family: var(--font-display);
  font-size: clamp(26px, 2.6vw, 36px);
  line-height: 1;
  font-weight: 500;
  color: var(--color-accent-deep);
  font-variant-numeric: tabular-nums;
}
.blog-prose .steps > li > strong {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(19px, 1.6vw, 22px);
  line-height: 1.25;
  margin-bottom: 6px;
}
.blog-prose .steps > li > div p { margin: 0 0 0.6em; }
.blog-prose .steps > li > div p:last-child { margin-bottom: 0; }

/* Callout — совет или предупреждение. */
.blog-prose .callout {
  margin: var(--space-6) 0;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface-2);
  border-left: 3px solid var(--color-accent-deep);
}
.blog-prose .callout-warn { border-left-color: var(--color-text-invert); }
.blog-prose .callout > strong:first-child {
  display: block;
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent-deep);
  margin-bottom: 8px;
}
.blog-prose .callout-warn > strong:first-child { color: var(--color-text-invert); }
.blog-prose .callout p { margin: 0 0 0.6em; }
.blog-prose .callout p:last-child { margin-bottom: 0; }

/* Compare — две колонки; на узком экране таблица прокручивается сама,
   а не вся страница. */
.blog-prose .compare {
  margin: var(--space-5) 0 var(--space-6);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  max-width: 100%;
}
.blog-prose .compare table {
  border-collapse: collapse;
  width: 100%;
  min-width: 520px;
  font-size: 0.92em;
  line-height: 1.5;
}
.blog-prose .compare th {
  text-align: left;
  vertical-align: bottom;
  background: var(--color-base);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: var(--fw-medium);
  padding: 12px 16px;
  width: 50%;
}
.blog-prose .compare th + th { border-left: 1px solid rgba(255, 255, 255, 0.12); }
.blog-prose .compare td {
  padding: 12px 16px;
  vertical-align: top;
  border-bottom: 1px solid var(--color-line-invert);
}
.blog-prose .compare td + td { border-left: 1px solid var(--color-line-invert); }

/* Stat — один сигнальный блок: тёмная плашка на бумаге, lime на тёмном. */
.blog-prose .stat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3) var(--space-5);
  align-items: center;
  margin: var(--space-6) 0;
  padding: var(--space-5);
  background: var(--color-base);
  color: var(--color-text);
}
.blog-prose .stat-value {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(40px, 5vw, 64px);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--color-accent);
  white-space: nowrap;
}
.blog-prose .stat-label { font-size: var(--fs-body-s); line-height: 1.45; color: var(--color-text); }

/* Sources — сноска в конце. */
.blog-prose .sources {
  margin-top: var(--space-7);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-line-invert);
  font-size: var(--fs-body-s);
  color: var(--color-text-invert-muted);
}
.blog-prose .sources h2 {
  font-family: var(--font-body);
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-medium);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  margin: 0 0 var(--space-3);
  color: var(--color-text-invert-muted);
}
.blog-prose .sources h2::before { display: none; }
.blog-prose .sources ul li::before { background: var(--color-line-invert); }

/* FAQ */
.blog-faq { margin-top: var(--space-8); }
.blog-faq h2 { margin-top: 0; }
.blog-faq-item { border-top: 1px solid var(--color-line-invert); }
.blog-faq-item:last-child { border-bottom: 1px solid var(--color-line-invert); }
.blog-faq-item summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(19px, 1.6vw, 22px);
  line-height: 1.3;
}
.blog-faq-item summary::-webkit-details-marker { display: none; }
.blog-faq-sign {
  flex: none;
  font-family: var(--font-body);
  font-size: 24px;
  line-height: 1;
  color: var(--color-accent-deep);
  transition: transform var(--dur-base) var(--ease-default);
}
.blog-faq-item[open] .blog-faq-sign { transform: rotate(45deg); }
.blog-faq-a { padding: 0 0 var(--space-4); max-width: 60ch; }
.blog-faq-a p { margin: 0; }

/* ---------------------------------------------------------------- CTA */
.blog-cta { padding: var(--space-9) 0; }
.blog-cta-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--fs-h2);
  line-height: var(--lh-heading);
  letter-spacing: var(--ls-heading);
  max-width: 18ch;
  margin: 0 0 var(--space-4);
  text-wrap: balance;
}
.blog-cta-lede {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.55;
  color: var(--color-text-muted);
  max-width: 54ch;
  margin: 0 0 var(--space-6);
}
.blog-cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-3) var(--space-4); }
.blog-cta-tg {
  font-size: var(--fs-body);
  font-weight: var(--fw-medium);
  display: inline-flex; gap: 8px;
  transition: color var(--dur-fast) var(--ease-default);
}
.blog-cta-tg span { color: var(--color-accent); }
.blog-cta-tg:hover { color: var(--color-accent); }

.blog-related { padding: 0 0 var(--space-9); }
.blog-related-title { font-family: var(--font-display); font-weight: 500; font-size: var(--fs-h3); margin: 0 0 var(--space-5); }
.blog-related-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid rgba(255, 255, 255, 0.12); }
.blog-related-list a {
  display: flex; justify-content: space-between; gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  font-size: var(--fs-h4);
  transition: color var(--dur-fast) var(--ease-default);
}
.blog-related-list a span[aria-hidden] { color: var(--color-accent); }
.blog-related-list a:hover { color: var(--color-accent); }

/* -------------------------------------------------------------- индекс */
.blog-title--index { max-width: 14ch; }
.blog-index-lede {
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.55;
  color: var(--color-text-muted);
  max-width: 54ch;
}

.blog-cards { list-style: none; margin: 0; padding: 0; border-bottom: 1px solid var(--color-line-invert); }
.blog-card { border-top: 1px solid var(--color-line-invert); }
.blog-card-link {
  display: grid;
  grid-template-columns: clamp(48px, 6vw, 96px) minmax(0, 1fr) minmax(200px, 340px);
  gap: var(--space-5);
  align-items: start;
  padding: var(--space-6) 0;
  color: var(--color-text-invert);
}
.blog-card-n {
  font-family: var(--font-display);
  font-size: clamp(24px, 2.4vw, 36px);
  line-height: 1;
  color: var(--color-accent-deep);
  font-variant-numeric: tabular-nums;
}
.blog-card-text { display: grid; gap: var(--space-3); min-width: 0; }
.blog-card-meta { font-size: var(--fs-caption); letter-spacing: 0.04em; color: var(--color-text-invert-muted); }
.blog-card-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(24px, 2.6vw, 40px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: balance;
  overflow-wrap: break-word;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
  transition: text-decoration-color var(--dur-fast) var(--ease-default);
}
.blog-card-link:hover .blog-card-title { text-decoration-color: var(--color-accent-deep); }
.blog-card-lede { font-size: var(--fs-body); line-height: 1.55; color: var(--color-text-invert-muted); max-width: 60ch; }
.blog-card-img { display: block; overflow: hidden; aspect-ratio: 3 / 2; background: var(--color-surface-2); }
.blog-card-img img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--dur-slow) var(--ease-default);
}
.blog-card-link:hover .blog-card-img img { transform: scale(1.03); }

.blog-empty { padding: var(--space-6) 0 var(--space-7); max-width: 900px; }
.blog-empty-big {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(56px, 11vw, 168px);
  line-height: 0.92;
  letter-spacing: -0.04em;
  margin: 0 0 var(--space-6);
}
.blog-empty-dot { color: var(--color-accent-deep); }
.blog-empty-text {
  font-size: clamp(17px, 1.6vw, 21px);
  line-height: 1.55;
  color: var(--color-text-invert-muted);
  max-width: 52ch;
  margin: 0 0 var(--space-6);
}

/* Подвал: строка услуг, как на страницах услуг (.svc-footer-services). */
.blog-footer-services { row-gap: var(--space-3); }

/* ------------------------------------------------------------ адаптив */
@media (max-width: 1100px) {
  .blog-grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-6); }
  .blog-rail {
    position: static;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    padding: var(--space-4) 0;
    border-top: 1px solid var(--color-line-invert);
    border-bottom: 1px solid var(--color-line-invert);
    max-width: 68ch;
  }
  .blog-rail-svc { border-top: none; padding-top: 0; }
  .blog-prose { max-width: 68ch; }
}

@media (max-width: 840px) {
  /* Закреп на мобилке уезжает вниз (sections.css) — сверху место не нужно. */
  .blog-page { --blog-nav: 0px; }
  .blog-hero { padding-top: var(--space-6); }
  .blog-crumbs { margin-bottom: var(--space-5); }
  .blog-crumbs [aria-current="page"] { max-width: 100%; }
  .blog-tldr { grid-template-columns: minmax(0, 1fr); }
  .blog-cover { margin-top: var(--space-6); }
  .blog-card-link {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-3);
  }
  .blog-card-n { display: none; }
  .blog-card-img { order: -1; }
}

@media (max-width: 480px) {
  .blog-prose .stat { grid-template-columns: minmax(0, 1fr); }
  .blog-prose .stat-value { white-space: normal; }
  .blog-cta-row .btn { width: 100%; justify-content: center; box-sizing: border-box; }
}

@media (prefers-reduced-motion: reduce) {
  .blog-card-img img, .blog-faq-sign, .blog-rail-link span { transition: none; }
}