/* Four-label site navigation; native disclosure works without JavaScript. */
.site-header .header-inner { overflow: visible; }
.site-header .primary-nav {
  position: relative;
  overflow: visible;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(12px, 2vw, 28px);
}
.primary-nav > .nav-link, .primary-nav summary {
  display: flex;
  align-items: center;
  min-height: 44px;
  white-space: nowrap;
}
.primary-nav .analysis-nav { position: static; }
.primary-nav summary { cursor: pointer; list-style: none; gap: 4px; }
.primary-nav summary::-webkit-details-marker { display: none; }
.primary-nav summary::after { content: "▾"; font-size: 0.75em; position: static; width: auto; height: auto; background: none; transform: none; }
.primary-nav .analysis-nav[open] summary::after { content: "▴"; }
.primary-nav .analysis-nav-links {
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 110;
  width: min(280px, calc(100vw - 32px));
  margin: 0;
  padding: 8px;
  list-style: none;
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  box-shadow: 0 8px 24px #0002;
}
.primary-nav .analysis-nav-links li { margin: 0; }
.primary-nav .analysis-nav-links a {
  display: block;
  padding: 10px 12px;
  min-height: 44px;
  color: var(--color-primary);
  text-decoration: none;
  white-space: normal;
  line-height: 1.5;
}
.primary-nav .analysis-nav-links a:hover,
.primary-nav .analysis-nav-links a:focus-visible {
  background: var(--color-surface-offset);
}
.primary-nav a[aria-current="page"] { font-weight: 700; }
#about { scroll-margin-top: 130px; }
@media (max-width: 600px) {
  .site-header .header-inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0 12px;
    padding-top: 6px;
    padding-bottom: 0;
  }
  .site-header .site-logo { grid-column: 1; grid-row: 1; }
  .site-header .theme-toggle { grid-column: 2; grid-row: 1; }
  .site-header .primary-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    justify-content: space-between;
    gap: 8px;
  }
  .primary-nav > .nav-link, .primary-nav summary { font-size: 14px; }
}

@media (max-width: 360px) {
  .site-header .header-inner { padding-left: 12px; padding-right: 12px; }
  .primary-nav > .nav-link, .primary-nav summary { font-size: 12px; }
}