/* Shared page shell and responsive layout. */

.skip-link {
  position: fixed;
  z-index: 1000;
  inset-block-start: 8px;
  inset-inline-start: 8px;
  padding: 8px 12px;
  border: 2px solid var(--accent-color);
  border-radius: 4px;
  background: var(--bg-color);
  color: var(--text-color);
  font-weight: 700;
  transform: translateY(calc(-100% - 10px));
}

.skip-link:focus {
  transform: translateY(0);
}

.site-navigation {
  border-bottom: 1px solid var(--border-color);
  background: var(--sidebar-bg);
}

.site-navigation-inner {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.site-navigation-link {
  color: var(--text-color);
  font-weight: 700;
}

.site-navigation-link:hover {
  color: var(--accent-color);
  text-decoration: none;
}

.site-container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px;
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: var(--gap-width);
  align-items: start;
}

.main-content {
  grid-column: 1;
  min-width: 0;
}

.sidebar {
  grid-column: 2;
  position: sticky;
  top: 40px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  padding-right: 4px;
}

@media (min-width: 1300px) {
  .site-navigation-inner {
    max-width: var(--content-width);
  }

  .site-container {
    max-width: none;
    grid-template-columns: 1fr var(--content-width) 1fr;
    gap: 0;
  }

  .main-content {
    grid-column: 2;
  }

  .sidebar {
    grid-column: 3;
    width: var(--sidebar-width);
    margin-left: var(--gap-width);
    justify-self: start;
  }
}

@media (max-width: 900px) {
  .site-navigation-inner {
    padding: 10px 15px;
  }

  .site-container {
    display: block;
    padding: 20px 15px;
  }

  .main-content {
    margin-bottom: 60px;
  }

  .sidebar {
    border-top: 1px solid var(--border-color);
    padding-top: 40px;
    padding-right: 0;
    margin-left: 0;
    width: 100%;
    max-height: none;
    overflow-y: visible;
    position: static;
  }

  html[data-toc-ready] .sidebar[data-mobile-empty] {
    display: none;
  }
}