.container {
  width: min(var(--container), calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 249, 252, 0.95);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 72px;
}

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

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #4f46e5);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 1.2rem;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--text-muted);
  font-weight: 600;
}

.site-nav a:hover,
.site-nav a[aria-current='page'] {
  color: var(--text);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.7rem;
}

main {
  padding: 2rem 0 4rem;
}

.section {
  padding: 2.2rem 0;
}

.section-heading {
  margin-bottom: 1.2rem;
}

.content-layout {
  display: grid;
  gap: 1.5rem;
}

.content-main {
  min-width: 0;
}

.content-sidebar {
  align-self: start;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  margin-top: 3rem;
}

.footer-grid {
  display: grid;
  gap: 1.2rem;
  padding: 2rem 0;
}

.footer-nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.95rem;
}

@media (min-width: 900px) {
  .content-layout {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 2rem;
  }

  .footer-grid {
    grid-template-columns: 1.5fr 1fr;
    align-items: center;
  }
}

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: none;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    padding: 1rem;
    flex-direction: column;
    gap: 0.8rem;
  }
}