.nav::before,
.nav::after {
  position: fixed;
  right: 0;
  left: 0;
  pointer-events: none;
  content: "";
  opacity: 0;
  visibility: hidden;
}

.nav::before {
  display: none;
  top: 0;
  z-index: 1;
  height: 0;
  overflow: hidden;
  background:
    var(--nav-dropdown-surface-glow),
    var(--nav-dropdown-surface);
  border-radius: 0 0 var(--nav-panel-radius) var(--nav-panel-radius);
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  box-shadow: var(--shadow-glass);
  clip-path: inset(0 0 0 0 round 0 0 var(--nav-panel-radius) var(--nav-panel-radius));
  transition:
    height var(--motion-nav-surface) var(--motion-nav-ease),
    opacity var(--motion-nav-ui) var(--motion-nav-ease),
    visibility var(--motion-fast) linear var(--motion-nav-surface);
  will-change: height, opacity;
}

.nav::after {
  top: calc(var(--nav-menu-panel-height) - var(--space-half));
  bottom: 0;
  z-index: 0;
  background: color-mix(in oklch, var(--color-ink-980) 12%, transparent);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  transition:
    opacity var(--motion-nav-ui) var(--motion-nav-ease),
    visibility var(--motion-fast) linear var(--motion-nav-ui);
}

body.is-nav-menu-open .nav::before,
body.is-nav-menu-open .nav::after,
body.is-nav-mobile-open .nav::after {
  opacity: 1;
  visibility: visible;
  transition-delay: var(--motion-fast);
}

body.is-nav-menu-open .nav::before {
  height: var(--nav-menu-panel-height);
  clip-path: inset(0 0 0 0 round 0 0 var(--nav-panel-radius) var(--nav-panel-radius));
}

.nav__dropdown {
  position: fixed;
  inset: 0 0 auto;
  z-index: 2;
  width: 100vw;
  height: var(--nav-menu-panel-height);
  max-height: min(var(--nav-menu-panel-height), calc(100svh - var(--space-base)));
  display: grid;
  grid-template-columns: minmax(var(--content-sm), 0.82fr) minmax(0, 1.45fr);
  gap: var(--space-1-5);
  padding: calc(var(--nav-height) + var(--space-base)) max(var(--shell-padding-x), calc((100vw - var(--hero-shell-max)) / 2 + var(--space-2))) var(--space-1-5);
  overflow: hidden;
  background:
    var(--nav-dropdown-surface-glow),
    var(--nav-dropdown-surface);
  border-radius: 0 0 var(--nav-panel-radius) var(--nav-panel-radius);
  box-shadow: var(--shadow-glass);
  color: var(--text-primary);
  clip-path: inset(0 0 100% 0 round 0 0 var(--nav-panel-radius) var(--nav-panel-radius));
  opacity: 1;
  pointer-events: none;
  transform: none;
  visibility: hidden;
  transition:
    clip-path var(--motion-nav-surface) var(--motion-nav-ease),
    opacity var(--motion-nav-content) var(--motion-nav-ease),
    visibility var(--motion-fast) linear var(--motion-nav-surface);
}

.nav__group.is-open .nav__dropdown {
  clip-path: inset(0 0 0 0 round 0 0 var(--nav-panel-radius) var(--nav-panel-radius));
  opacity: 1;
  pointer-events: auto;
  transform: none;
  visibility: visible;
  transition-delay: var(--motion-nav-content-delay), var(--motion-nav-content-delay), var(--motion-fast);
}

body.is-nav-switching .nav__dropdown {
  clip-path: inset(0 0 0 0 round 0 0 var(--nav-panel-radius) var(--nav-panel-radius));
  transform: none;
  transition: none;
  transition-delay: var(--motion-fast);
}

body.is-nav-switching .nav__group:not(.is-open) .nav__dropdown {
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}

body.is-nav-switching .nav__group.is-open .nav__dropdown {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
  transition-delay: var(--motion-fast);
}

.nav__drop-grid {
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-base);
}

.nav__drop-card {
  min-width: 0;
  min-height: var(--nav-menu-feature-min);
  display: grid;
  align-content: start;
  gap: var(--space-half);
  padding: var(--space-base);
  overflow: hidden;
  background: var(--nav-card-surface);
  border: var(--border-subtle);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
}

.nav__drop-card--lead {
  min-height: calc(var(--nav-menu-feature-min) + var(--space-lg));
  align-content: end;
  padding: var(--space-1-5);
  background:
    var(--nav-dropdown-lead-overlay),
    var(--nav-dropdown-lead-surface);
  border-radius: var(--radius-hero);
  box-shadow: var(--shadow-card);
  color: var(--text-inverse);
}

.nav__drop-card span,
.nav__drop-card strong,
.nav__drop-card small {
  min-width: 0;
  display: block;
  overflow-wrap: anywhere;
}

.nav__drop-card span {
  color: var(--text-muted);
  font-size: var(--text-xs);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-tight);
}

.nav__drop-card strong {
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-md);
  font-weight: var(--font-weight-strong);
  line-height: var(--line-tight);
}

.nav__drop-card small {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-tight);
}

.nav__drop-card--lead span,
.nav__drop-card--lead small {
  color: var(--text-inverse-muted);
}

.nav__drop-card--lead strong {
  color: var(--text-inverse);
  font-size: var(--text-lg);
}

.nav__quicklinks {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-min);
  padding-top: var(--space-half);
}

.nav__quicklinks a {
  min-height: calc(var(--button-min-height) - var(--space-half));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-min) var(--space-half);
  background: var(--nav-chip-surface);
  border: var(--border-subtle);
  border-radius: var(--radius-pill);
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-strong);
  line-height: var(--line-tight);
  text-decoration: none;
  box-shadow: inset 0 0 0 var(--border-width-strong) transparent;
  transition:
    background-color var(--motion-nav-ui) var(--motion-nav-ease),
    border-color var(--motion-nav-ui) var(--motion-nav-ease),
    box-shadow var(--motion-nav-ui) var(--motion-nav-ease),
    color var(--motion-nav-ui) var(--motion-nav-ease);
}

.nav__drop-card--lead .nav__quicklinks a {
  background: var(--nav-chip-lead-surface);
}

.nav__quicklinks a:hover,
.nav__quicklinks a:focus-visible {
  background: var(--nav-chip-hover-surface);
  border-color: var(--nav-chip-hover-border);
  box-shadow: var(--nav-chip-hover-shadow);
  outline: none;
  transform: none;
}

.nav__quicklinks a:focus-visible {
  box-shadow: var(--focus-ring);
}

@media (prefers-reduced-motion: reduce) {
  .nav::before,
  .nav::after,
  .nav__dropdown,
  .nav__quicklinks a {
    animation: none;
    clip-path: none;
    transform: none;
    transition: none;
  }
}

@media (max-width: 64rem) and (min-width: 48.8125rem) {
  .nav__drop-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 48.75rem) {
  .nav::before {
    display: none;
  }

  .nav::after {
    top: var(--nav-height);
    bottom: 0;
  }

  .nav__dropdown,
  .nav__group:first-child .nav__dropdown,
  .nav__group:last-child .nav__dropdown {
    position: static;
    width: 100%;
    height: auto;
    max-height: none;
    display: none;
    grid-template-columns: 1fr;
    gap: var(--space-half);
    padding: var(--space-half);
    overflow: visible;
    background: var(--surface-panel-muted);
    border: var(--border-subtle);
    border-radius: var(--radius-lg);
    box-shadow: none;
    clip-path: none;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    visibility: visible;
  }

  .nav__group.is-open .nav__dropdown {
    display: grid;
  }

  .nav__drop-grid {
    grid-template-columns: 1fr;
    gap: var(--space-half);
  }

  .nav__drop-card,
  .nav__drop-card--lead {
    min-height: auto;
    gap: var(--space-min);
    padding: var(--space-half) var(--space-base);
    background: var(--surface-page-soft);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    box-shadow: none;
    color: var(--text-primary);
  }

  .nav__drop-card span,
  .nav__drop-card small,
  .nav__drop-card--lead span,
  .nav__drop-card--lead small {
    color: var(--text-secondary);
  }

  .nav__drop-card strong,
  .nav__drop-card--lead strong {
    color: var(--text-primary);
    font-size: var(--text-md);
  }

  .nav__drop-card small {
    display: none;
  }

  .nav__quicklinks {
    gap: var(--space-min);
    padding-top: var(--space-min);
  }

  .nav__quicklinks a {
    min-height: auto;
    padding: var(--space-min) var(--space-half);
    font-size: var(--text-xs);
  }
}