:root {
  color-scheme: light dark;
  --ink: #0f172a;
  --muted: #526071;
  --line: #dbe3ee;
  --soft: #f6f8fb;
  --panel: #ffffff;
  --panel-strong: #ffffff;
  --header-bg: rgba(255, 255, 255, 0.92);
  --header-line: rgba(219, 227, 238, 0.9);
  --body-text: #334155;
  --link-muted: #334155;
  --card-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  --meta-shadow: 0 16px 45px rgba(15, 23, 42, 0.06);
  --callout-bg: #eff6ff;
  --callout-line: #bfdbfe;
  --callout-ink: #1e3a8a;
  --brand: #1f8cff;
  --brand-ink: #0b4f9c;
  --dark: #07111f;
}

html.dark,
html[data-theme="dark"] {
  --ink: #e5edf8;
  --muted: #94a3b8;
  --line: #233044;
  --soft: #020617;
  --panel: #0f172a;
  --panel-strong: #111c31;
  --header-bg: rgba(2, 6, 23, 0.9);
  --header-line: rgba(51, 65, 85, 0.8);
  --body-text: #cbd5e1;
  --link-muted: #cbd5e1;
  --card-shadow: 0 18px 45px rgba(0, 0, 0, 0.32);
  --meta-shadow: 0 20px 55px rgba(0, 0, 0, 0.28);
  --callout-bg: rgba(30, 64, 175, 0.2);
  --callout-line: rgba(96, 165, 250, 0.36);
  --callout-ink: #bfdbfe;
  --brand-ink: #60a5fa;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: var(--soft);
  color: var(--ink);
  line-height: 1.7;
}

a {
  color: var(--brand-ink);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--header-line);
  background: var(--header-bg);
  backdrop-filter: blur(16px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: 1120px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0;
}

.brand-system {
  flex-wrap: wrap;
}

.brand-card {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: 0.6rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--panel-strong);
  padding: 0.38rem 0.65rem 0.38rem 0.45rem;
  box-shadow: var(--card-shadow);
  transition:
    border-color 160ms ease,
    transform 160ms ease;
}

.brand-card:hover,
.brand-card:focus {
  border-color: var(--brand);
  text-decoration: none;
  transform: translateY(-1px);
}

.brand-card-primary {
  min-height: 3.25rem;
  padding: 0.42rem 0.85rem 0.42rem 0.5rem;
  gap: 0.7rem;
}

.brand-card-secondary {
  min-height: 2.75rem;
  gap: 0.5rem;
  opacity: 0.92;
}

.brand-card img {
  width: 2rem;
  height: 2rem;
  border-radius: 0.45rem;
  object-fit: cover;
}

.brand-card-primary img {
  width: 2.35rem;
  height: 2.35rem;
}

.brand-card strong,
.brand-title {
  display: block;
  color: var(--ink);
  font-size: 0.96rem;
  font-weight: 850;
  line-height: 1.1;
}

.brand-card-primary strong {
  font-size: 1.1rem;
}

.brand-card-secondary .brand-title {
  font-size: 0.88rem;
}

.brand-card small {
  display: block;
  margin-top: 0.18rem;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.1;
}

.brand-relation {
  display: inline-grid;
  width: 2.1rem;
  height: 2.1rem;
  place-items: center;
  color: var(--muted);
}

.brand-relation svg {
  display: block;
  width: 1.65rem;
  height: 1.65rem;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.9rem;
  font-size: 0.92rem;
  font-weight: 650;
}

.nav-links a {
  color: var(--link-muted);
}

.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 4rem 1.25rem 5rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(17rem, 0.8fr);
  gap: 2rem;
  align-items: start;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 0.85rem;
  color: var(--brand-ink);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.15;
  letter-spacing: -0.035em;
}

h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(2.4rem, 6vw, 5.1rem);
}

.lede {
  max-width: 760px;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
}

.meta-card {
  width: min(100%, 28.5rem);
  justify-self: end;
  align-self: center;
  margin-top: -1rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--panel);
  padding: 1.25rem;
  box-shadow: var(--meta-shadow);
}

.meta-card p {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.meta-card strong {
  display: block;
  color: var(--ink);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 16rem;
  gap: 3rem;
  padding-top: 3rem;
}

.article {
  min-width: 0;
}

.article section {
  margin: 0 0 2.5rem;
}

.article h2 {
  margin: 0 0 0.8rem;
  font-size: clamp(1.55rem, 2.3vw, 2.1rem);
}

.article h3 {
  margin: 1.5rem 0 0.6rem;
  font-size: 1.15rem;
}

.article p,
.article li {
  color: var(--body-text);
}

.article p {
  margin: 0.85rem 0 0;
}

.article ul,
.article ol {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
}

.article li {
  margin: 0.55rem 0;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.info-box {
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: var(--panel);
  padding: 1rem;
}

.info-box strong {
  display: block;
  color: var(--ink);
}

.toc {
  position: sticky;
  top: 5rem;
  align-self: start;
  border-left: 2px solid var(--line);
  padding-left: 1rem;
  font-size: 0.92rem;
}

.toc strong {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--ink);
}

.toc a {
  display: block;
  margin: 0.45rem 0;
  color: var(--muted);
}

.callout {
  margin: 1.25rem 0;
  border: 1px solid var(--callout-line);
  border-radius: 0.5rem;
  background: var(--callout-bg);
  padding: 1rem 1.1rem;
  color: var(--callout-ink);
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--panel-strong);
}

.footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 0.8rem;
}

@media (max-width: 820px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .brand-system {
    width: 100%;
  }

  .brand-card {
    min-height: 2.85rem;
  }

  .brand-card strong,
  .brand-title {
    font-size: 0.9rem;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .page {
    padding-top: 2.5rem;
  }

  .hero,
  .content,
  .info-grid {
    grid-template-columns: 1fr;
  }

  .meta-card {
    width: 100%;
    justify-self: stretch;
    margin-top: 0;
  }

  .toc {
    position: static;
    order: -1;
  }
}