:root {
  --bg-primary: #FFFFFF;
  --bg-secondary: #F4F7FF;
  --bg-card: #FFFFFF;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --border: #E2E8F0;
  --blue: #3B82F6;
  --blue-dark: #1D4ED8;
  --blue-light: #EFF6FF;
  --navy: #0D1B3E;
  --green: #10B981;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow-lg: 0 10px 30px rgba(0,0,0,.10);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: .25s ease;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: Inter, -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }

.nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(20px);
}
.nav__inner {
  max-width: 1160px; height: 64px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: flex-start; gap: 16px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 900; }
.logo__mark {
  width: 38px; height: 38px; border-radius: 10px; flex-shrink: 0;
  border: 1px solid rgba(183,249,75,.35); background: #07080B;
  display: grid; place-items: center;
}
.logo__mark::before {
  content: ""; width: 10px; height: 10px; border-radius: 50%;
  border: 2.5px solid #B7F94B; box-shadow: 0 0 12px rgba(183,249,75,.8);
}
.logo span span { color: #B7F94B; }
.nav__links { display: flex; align-items: center; gap: 8px; list-style: none; }
.nav__links a {
  display: inline-flex; padding: 8px 12px; border-radius: 8px;
  color: var(--text-secondary); font-size: 14px; font-weight: 700;
}
.nav__links a:hover, .nav__links a.active { background: var(--bg-secondary); color: var(--text-primary); }
.theme-toggle {
  margin-left: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-card);
  color: var(--text-secondary);
  padding: 8px 12px;
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.theme-toggle:hover { color: var(--blue-dark); border-color: rgba(59,130,246,.45); }
.lang-switch {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 800; letter-spacing: .04em;
  color: var(--text-muted); text-decoration: none; user-select: none;
}
.lang-switch a { color: var(--text-secondary); text-decoration: none; padding: 8px 2px; }
.lang-switch a:hover { color: var(--text-primary); }
.lang-switch a[aria-current="true"],
html[lang="en"] .lang-switch a[hreflang="en"],
html[lang="ru"] .lang-switch a[hreflang="ru"] { color: var(--blue); }
.lang-switch + .theme-toggle { margin-left: 8px; }

.page-hero {
  background: linear-gradient(160deg, #eef2ff 0%, #dbeafe 48%, #f0f9ff 100%);
  padding: 72px 24px 54px;
  border-bottom: 1px solid var(--border);
}
.page-hero__inner { max-width: 1120px; margin: 0 auto; position: relative; z-index: 1; }
.page-hero--themed {
  position: relative; isolation: isolate;
  background-color: #0d1b3e;
  background-image: url("/assets/blog-hero.jpg");
  background-size: cover; background-position: center; background-repeat: no-repeat;
  border-bottom: none; color: #fff;
}
.page-hero--themed::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(13,27,62,.55) 0%, rgba(13,27,62,.88) 100%);
  z-index: 0; pointer-events: none;
}
.page-hero--themed h1, .page-hero--themed .article-title {
  color: #fff; text-shadow: 0 2px 12px rgba(0,0,0,.35);
}
.page-hero--themed .lead { color: rgba(255,255,255,.9); }
.page-hero--themed .meta { color: rgba(255,255,255,.78); }
.page-hero--themed .eyebrow {
  background: rgba(255,255,255,.14); border-color: rgba(255,255,255,.22); color: #fff;
  backdrop-filter: blur(10px) saturate(140%);
}
.page-hero--themed .back-link { color: #cfe1ff; }
.page-hero--themed .back-link:hover { color: #fff; }

.breadcrumbs { margin-bottom: 16px; }
.breadcrumbs ol {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 4px 8px;
  font-size: 13px; font-weight: 700; color: var(--text-secondary);
}
.breadcrumbs ol li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs a { color: var(--blue-dark); border-bottom: 1px dashed transparent; }
.breadcrumbs a:hover { border-color: currentColor; }
.breadcrumbs__sep { color: var(--text-muted); opacity: .65; }
.breadcrumbs [aria-current="page"] { color: var(--text-primary); font-weight: 800; }
.page-hero--themed .breadcrumbs ol { color: rgba(255,255,255,.78); }
.page-hero--themed .breadcrumbs a { color: #cfe1ff; }
.page-hero--themed .breadcrumbs a:hover { color: #fff; }
.page-hero--themed .breadcrumbs [aria-current="page"] { color: #fff; }
.page-hero--themed .breadcrumbs__sep { color: rgba(255,255,255,.45); }

.page-hero__inner--split {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 32px; align-items: start;
}
.page-hero__text { min-width: 0; }
.hero-rates {
  display: flex; flex-direction: column; gap: 14px;
  padding: 18px 18px 16px; border-radius: var(--radius);
  background: rgba(255,255,255,.10); border: 1px solid rgba(255,255,255,.22);
  color: #fff;
  backdrop-filter: blur(12px) saturate(140%);
  box-shadow: 0 8px 30px rgba(0,0,0,.18);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease;
}
.hero-rates:hover {
  transform: translateY(-2px); border-color: rgba(255,255,255,.35);
  background: rgba(255,255,255,.14); box-shadow: 0 12px 36px rgba(0,0,0,.28);
}
.hero-rates__eyebrow {
  font-size: 12px; font-weight: 900; letter-spacing: .8px; text-transform: uppercase;
}
.hero-rates p { font-size: 14px; line-height: 1.55; color: rgba(255,255,255,.86); }
.hero-rates__cta { color: #cfe1ff; font-weight: 800; font-size: 13px; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; margin-bottom: 22px;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--bg-card); color: var(--blue);
  font-size: 13px; font-weight: 800; box-shadow: var(--shadow);
}
.eyebrow::before { content: ""; width: 8px; height: 8px; border-radius: 999px; background: var(--green); }
.article-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 22px; }
.article-actions .eyebrow, .article-actions .back-link { margin-bottom: 0; }
.back-link {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 5px 12px; margin-bottom: 22px;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--bg-card); color: var(--blue);
  font-size: 13px; font-weight: 800; box-shadow: var(--shadow);
  transition: border-color .18s ease, color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.back-link__icon { display: block; width: 16px; height: 16px; }
.back-link__icon svg { display: block; width: 16px; height: 16px; stroke: currentColor; }
.back-link:hover {
  border-color: rgba(59,130,246,.42); color: var(--blue-dark);
  transform: translateY(-1px); box-shadow: var(--shadow-lg);
}
.back-link:hover .back-link__icon { transform: translateX(-2px); }

h1 {
  max-width: 860px; font-size: clamp(34px, 6vw, 64px); line-height: 1.06;
  font-weight: 900; letter-spacing: -1px; margin-bottom: 20px;
}
.article-title {
  max-width: 820px; font-size: clamp(30px, 4vw, 48px);
  line-height: 1.12; letter-spacing: -.4px;
}
.lead { max-width: 760px; color: var(--text-secondary); font-size: 18px; line-height: 1.75; }
.meta { color: var(--text-muted); font-size: 13px; font-weight: 800; margin-top: 18px; }

.section { padding: 56px 24px 76px; }
.section__inner { max-width: 1120px; margin: 0 auto; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 28px; }
.chip {
  padding: 10px 16px; border: 1px solid var(--border); border-radius: 999px;
  background: var(--bg-card); color: var(--text-secondary); font-weight: 800; box-shadow: var(--shadow);
}
.chip.active { border-color: rgba(59,130,246,.6); color: var(--blue); background: rgba(59,130,246,.1); }

.blog-layout {
  display: grid; grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px; align-items: start; margin-bottom: 18px;
}
.blog-layout__main { min-width: 0; }
.blog-layout__aside { display: grid; gap: 16px; align-self: start; }
.post-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.post-grid.post-grid--with-aside { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.post-grid.post-grid--full { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.section-divider {
  font-size: 22px; font-weight: 900; letter-spacing: -.3px;
  margin: 36px 0 18px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.post-card {
  min-height: 320px; display: flex; flex-direction: column; justify-content: space-between;
  padding: 22px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-card); box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.post-card:hover { border-color: rgba(59,130,246,.45); box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.post-card__cover {
  height: 160px; margin-bottom: 14px; border-radius: 14px; object-fit: cover; width: 100%;
  background: var(--bg-secondary);
}
.post-card__tag {
  display: inline-flex; width: fit-content; padding: 5px 10px; border-radius: 999px;
  background: rgba(59,130,246,.1); color: var(--blue);
  font-size: 12px; font-weight: 900; margin-bottom: 16px;
  text-transform: uppercase; letter-spacing: .3px;
}
.post-card h2 { font-size: 21px; line-height: 1.25; margin-bottom: 12px; }
.post-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.7; }
.post-card__foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding-top: 24px; color: var(--text-muted); font-size: 13px; font-weight: 800;
}
.post-card__link { color: var(--blue); }

.article-shell {
  max-width: 1040px; margin: 0 auto; padding: 48px 24px 76px;
  display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 36px; align-items: start;
}
.article-body { font-size: 18px; line-height: 1.85; color: #263244; }
.article-body h2 { font-size: 30px; line-height: 1.2; margin: 34px 0 14px; color: var(--text-primary); }
.article-body h3 { font-size: 23px; line-height: 1.25; margin: 28px 0 12px; color: var(--text-primary); }
.article-body p, .article-body ul, .article-body ol, .article-body blockquote { margin-bottom: 18px; }
.article-body ul, .article-body ol { padding-left: 24px; }
.article-body a { color: var(--blue-dark); text-decoration: underline; }
.article-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .86em; font-weight: 700;
  padding: 2px 7px; border-radius: 6px;
  background: var(--bg-secondary); border: 1px solid var(--border);
  color: var(--navy);
}
.article-body > ul { display: grid; gap: 8px; }
.article-body > ol {
  list-style: none; padding-left: 0; counter-reset: steps; display: grid; gap: 10px;
}
.article-body > ol > li {
  counter-increment: steps; position: relative;
  padding: 14px 16px 14px 56px;
  border: 1px solid var(--border); border-radius: 14px;
  background: var(--bg-secondary); line-height: 1.6;
}
.article-body > ol > li::before {
  content: counter(steps);
  position: absolute; left: 14px; top: 14px;
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--navy); color: #fff;
  font-size: 13px; font-weight: 800;
  display: grid; place-items: center;
}
.post-rule {
  border: 0; height: 1px; margin: 28px 0;
  background: var(--border);
}
.callout {
  padding: 16px 18px; margin: 22px 0 26px;
  border-radius: 14px; border: 1px solid var(--border);
}
.callout__label {
  display: block; margin-bottom: 6px;
  font-size: 11px; font-weight: 900; letter-spacing: .7px; text-transform: uppercase;
}
.callout p:last-child { margin-bottom: 0; }
.callout--warn { background: #FFFBEB; border-color: #F6D38B; }
.callout--warn .callout__label { color: #B45309; }
.callout--tip { background: #EFF6FF; border-color: #BFDBFE; }
.callout--tip .callout__label { color: #1D4ED8; }
.callout--ok { background: #ECFDF5; border-color: #A7F3D0; }
.callout--ok .callout__label { color: #047857; }
.callout--next { background: #EEF2FF; border-color: #C7D2FE; }
.callout--next .callout__label { color: #4338CA; }

.series {
  margin: 0 0 32px; padding: 18px;
  border: 1px solid var(--border); border-radius: 18px;
  background: linear-gradient(180deg, #F8FAFF 0%, var(--bg-card) 100%);
  box-shadow: var(--shadow);
}
.series__head {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 12px;
  margin-bottom: 12px;
}
.series__kicker {
  font-size: 11px; font-weight: 900; letter-spacing: .8px; text-transform: uppercase;
  color: var(--blue);
}
.series__head strong { font-size: 16px; letter-spacing: -.2px; }
.series__count {
  margin-left: auto; font-size: 13px; font-weight: 800; color: var(--text-muted);
}
.series__toc summary {
  cursor: pointer; list-style: none;
  font-size: 13px; font-weight: 800; color: var(--blue-dark);
}
.series__toc summary::-webkit-details-marker { display: none; }
.series__toc summary::after { content: " ↓"; font-weight: 700; color: var(--text-muted); }
.series__toc[open] summary::after { content: " ↑"; }
.series__toc ol {
  list-style: none; padding: 10px 0 0; margin: 8px 0 0;
  border-top: 1px solid var(--border);
  display: grid; gap: 2px; max-height: 320px; overflow: auto;
}
.series__item a {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 8px 10px; border-radius: 10px;
  text-decoration: none; color: var(--text-primary);
  font-size: 14px; font-weight: 600; line-height: 1.35;
}
.series__item a:hover { background: var(--blue-light); }
.series__item.is-current a {
  background: rgba(59,130,246,.12); color: var(--blue-dark);
}
.series__n {
  flex: 0 0 22px; height: 22px; border-radius: 7px;
  display: grid; place-items: center;
  background: var(--bg-secondary); color: var(--text-muted);
  font-size: 11px; font-weight: 900;
}
.series__item.is-current .series__n { background: var(--navy); color: #fff; }
.series__pager {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px;
}
.series__pager-link {
  display: flex; flex-direction: column; gap: 4px;
  padding: 12px 14px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--bg-card);
  font-size: 14px; font-weight: 800; line-height: 1.35;
  text-decoration: none; color: var(--text-primary);
}
.series__pager-link:hover { border-color: rgba(59,130,246,.45); }
.series__pager-link--next { text-align: right; }
.series__dir {
  font-size: 11px; font-weight: 900; letter-spacing: .4px;
  text-transform: uppercase; color: var(--text-muted);
}
.series__pager-link.is-off { visibility: hidden; }
.article-body figure { margin: 1.4em 0 1.8em; }
.article-body figure img { width: 100%; border-radius: 16px; }
.post__fig { margin: 1.35em 0 1.7em; border-radius: 16px; overflow: hidden; }
.post__fig img { width: 100%; height: auto; display: block; }

.aside { position: sticky; top: 88px; display: grid; gap: 16px; }
.aside-card {
  position: relative; overflow: hidden;
  padding: 18px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-card); box-shadow: var(--shadow);
}
.aside-card h2, .aside-card h3 { font-size: 15px; line-height: 1.25; margin-bottom: 10px; }
.aside-card ul { list-style: none; display: grid; gap: 8px; }
.aside-card li { font-size: 13px; line-height: 1.45; }
.aside-card a { color: var(--blue-dark); font-weight: 700; }
.popular-list__meta { color: var(--text-muted); font-size: 11px; font-weight: 700; margin-top: 2px; }
.aside-cats { display: flex; flex-wrap: wrap; gap: 6px; }
.aside-cats__chip {
  display: inline-flex; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg-card);
  color: var(--text-secondary); font-weight: 700; font-size: 12px;
}
.aside-cats__chip:hover, .aside-cats__chip.is-active {
  border-color: var(--blue); color: var(--blue);
}
.aside-card--cta {
  background: linear-gradient(160deg, var(--navy) 0%, var(--blue-dark) 100%);
  color: #fff; border-color: transparent;
}
.aside-card__cta-glow {
  position: absolute; top: -40px; right: -40px; width: 160px; height: 160px;
  border-radius: 50%; background: radial-gradient(circle, rgba(59,130,246,.55), transparent 70%);
  pointer-events: none; filter: blur(18px);
}
.aside-card__cta-eyebrow {
  display: inline-block; padding: 4px 10px; border-radius: 999px;
  background: rgba(255,255,255,.18); color: #fff;
  font-size: 11px; font-weight: 900; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 10px;
}
.aside-card--cta h2 { color: #fff; font-size: 18px; line-height: 1.25; margin-bottom: 10px; }
.aside-card--cta p { color: rgba(255,255,255,.86); font-size: 13px; line-height: 1.55; margin-bottom: 16px; }
.aside-cta-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 16px; border-radius: var(--radius-sm);
  background: #fff; color: var(--blue-dark); font-weight: 900; font-size: 13px;
}
.aside-cta-btn:hover { transform: translateY(-1px); }

.related--inline { margin: 36px 0 12px; padding-top: 32px; border-top: 1px solid var(--border); }
.related--inline h2 { font-size: 22px; line-height: 1.25; margin-bottom: 18px; }
.related--inline .related__grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px;
}
.related__card {
  display: flex; flex-direction: column; gap: 8px; padding: 14px;
  border: 1px solid var(--border); border-radius: 14px;
  background: var(--bg-card); box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.related__card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: rgba(59,130,246,.45); }
.related__tag {
  display: inline-flex; width: fit-content; padding: 3px 9px; border-radius: 999px;
  background: rgba(59,130,246,.1); color: var(--blue);
  font-size: 11px; font-weight: 900; text-transform: uppercase; letter-spacing: .4px;
}
.related__card h3 { font-size: 15px; line-height: 1.3; }
.related__card p { font-size: 13px; color: var(--text-secondary); line-height: 1.55; }
.related__meta { font-size: 12px; color: var(--text-muted); font-weight: 700; margin-top: auto; }

.note {
  padding: 18px 20px; margin: 30px 0;
  border: 1px solid rgba(59,130,246,.24); border-radius: var(--radius);
  background: rgba(59,130,246,.08); color: var(--text-secondary);
  font-size: 15px; line-height: 1.65;
}

.course-panel {
  display: flex; flex-direction: column; gap: 22px;
  padding: 28px; margin: 8px 0 12px;
  border: 1px solid var(--border); border-radius: 20px;
  background: #fff;
  box-shadow: var(--shadow-lg);
}
.course-panel__kicker {
  display: inline-block; margin-bottom: 10px;
  padding: 4px 10px; border-radius: 999px;
  background: rgba(59,130,246,.12);
  font-size: 12px; font-weight: 900; letter-spacing: .7px; text-transform: uppercase;
  color: #1D4ED8;
}
.course-panel__copy h2 {
  font-size: 28px; line-height: 1.15; letter-spacing: -.4px; margin-bottom: 10px;
  color: #0F172A;
}
.course-panel__copy p {
  color: #334155; font-size: 16px; line-height: 1.65; margin-bottom: 16px; max-width: 46em;
}
.course-panel__cta {
  display: inline-flex; padding: 12px 18px; border-radius: 12px;
  background: #B7F94B; color: #07080B; font-weight: 800; font-size: 15px;
}
.course-panel__cta:hover { filter: brightness(1.05); transform: translateY(-1px); }
.course-panel__toc {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px 12px;
}
.course-panel__toc a {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 13px 14px; border-radius: 12px;
  border: 1px solid #E2E8F0; background: #F8FAFC;
  font-size: 16px; font-weight: 800; line-height: 1.4;
  color: #0F172A; text-decoration: none;
}
.course-panel__toc a:hover { border-color: #93C5FD; background: #EFF6FF; }
.course-panel__toc span {
  flex: 0 0 28px; height: 28px; border-radius: 8px;
  display: grid; place-items: center;
  background: #0D1B3E; color: #B7F94B;
  font-size: 13px; font-weight: 900;
}

.empty { padding: 48px 0; color: var(--text-secondary); }

.res-links {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin: 8px 0 22px;
}
.res-link {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 14px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg-card);
  color: var(--blue-dark); font-size: 13px; font-weight: 800;
  text-decoration: none !important;
  box-shadow: var(--shadow);
}
.res-link:hover { border-color: rgba(59,130,246,.45); transform: translateY(-1px); }

footer { background: #0D1B3E; color: #fff; padding: 58px 24px 30px; margin-top: 28px; }
.footer-grid {
  max-width: 1160px; margin: 0 auto 42px;
  display: grid; grid-template-columns: 2.1fr 1fr 1.2fr; gap: 38px;
}
.footer-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.footer-logo .logo__mark { width: 36px; height: 36px; border-radius: 9px; }
.footer-logo__text { font-size: 18px; font-weight: 800; color: white; }
.footer-logo__text span { color: #B7F94B; }
.footer-desc { font-size: 13px; color: rgba(255,255,255,.58); line-height: 1.75; max-width: 500px; }
.footer-col h4 {
  font-size: 13px; font-weight: 800; color: rgba(255,255,255,.86);
  margin-bottom: 16px; text-transform: uppercase; letter-spacing: .5px;
}
.footer-links { display: flex; flex-direction: column; gap: 10px; list-style: none; }
.footer-links a { font-size: 13px; color: rgba(255,255,255,.56); }
.footer-links a:hover { color: #60A5FA; }
.footer-contact-tg {
  display: inline-flex; align-items: center; gap: 8px;
  margin: 0 0 10px; padding: 9px 14px; border-radius: 10px;
  background: rgba(42,171,238,.15); border: 1px solid rgba(42,171,238,.30);
  color: #7DD3FC; font-size: 13px; font-weight: 700;
}
.footer-contact-tg:hover { background: rgba(42,171,238,.25); color: #fff; }
.footer-bottom {
  max-width: 1160px; margin: 0 auto; padding-top: 22px;
  border-top: 1px solid rgba(255,255,255,.08);
  display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  color: rgba(255,255,255,.35); font-size: 12px;
}

@media (max-width: 1100px) {
  .blog-layout { grid-template-columns: 1fr; }
  .post-grid.post-grid--full { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .page-hero__inner--split, .post-grid, .article-shell { grid-template-columns: 1fr; }
  .course-panel__toc { grid-template-columns: 1fr; }
  .aside { position: static; }
  .nav__links { display: none; }
}
@media (max-width: 700px) {
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .post-grid.post-grid--with-aside, .post-grid.post-grid--full { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .page-hero { padding: 48px 18px 38px; }
  .section, .article-shell { padding-left: 18px; padding-right: 18px; }
  .post-card { min-height: auto; }
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg-primary: #0B1220;
  --bg-secondary: #151D2E;
  --bg-card: #121A2B;
  --text-primary: #E8EEF8;
  --text-secondary: #9AA8C2;
  --text-muted: #6B7A94;
  --border: rgba(255,255,255,.10);
  --blue: #60A5FA;
  --blue-dark: #93C5FD;
  --blue-light: rgba(59,130,246,.16);
  --shadow: 0 1px 3px rgba(0,0,0,.35);
  --shadow-lg: 0 12px 32px rgba(0,0,0,.45);
}
html[data-theme="dark"] .nav { background: rgba(11,18,32,.92); }
html[data-theme="dark"] .logo { color: #fff; }
html[data-theme="dark"] .article-body { color: #C5D0E0; }
html[data-theme="dark"] .article-body h2,
html[data-theme="dark"] .article-body h3 { color: #F1F5FF; }
html[data-theme="dark"] .article-body a { color: #93C5FD; }
html[data-theme="dark"] .article-body blockquote {
  background: var(--bg-secondary);
  border-left-color: var(--blue);
}
html[data-theme="dark"] .note {
  background: rgba(59,130,246,.12);
  border-color: rgba(96,165,250,.28);
  color: var(--text-secondary);
}
html[data-theme="dark"] .article-body code {
  background: #0B1220; color: #E8EEF8; border-color: var(--border);
}
html[data-theme="dark"] .callout--warn { background: rgba(245,158,11,.12); border-color: rgba(245,158,11,.35); }
html[data-theme="dark"] .callout--tip { background: rgba(59,130,246,.12); border-color: rgba(96,165,250,.35); }
html[data-theme="dark"] .callout--ok { background: rgba(16,185,129,.12); border-color: rgba(16,185,129,.35); }
html[data-theme="dark"] .callout--next { background: rgba(99,102,241,.14); border-color: rgba(165,180,252,.35); }
html[data-theme="dark"] .course-panel {
  background: #152038;
  border-color: rgba(255,255,255,.22);
}
html[data-theme="dark"] .course-panel__kicker {
  background: #B7F94B; color: #07080B;
}
html[data-theme="dark"] .course-panel__copy h2 { color: #FFFFFF; }
html[data-theme="dark"] .course-panel__copy p { color: #F1F5F9; }
html[data-theme="dark"] .course-panel__toc a {
  color: #FFFFFF; background: #2B3D5C; border-color: rgba(255,255,255,.28);
}
html[data-theme="dark"] .course-panel__toc a:hover {
  background: #364A6E; border-color: #B7F94B;
}
html[data-theme="dark"] .series {
  background: #1A2336; border-color: rgba(255,255,255,.16);
}
html[data-theme="dark"] .series__head strong { color: #F8FAFC; }
html[data-theme="dark"] .series__item a { color: #F1F5FF; }
html[data-theme="dark"] .series__n { background: #0D1B3E; color: #B7F94B; }
html[data-theme="dark"] .res-link {
  background: #243049; color: #F8FAFC; border-color: rgba(255,255,255,.16);
}