.application-shell {
  min-block-size: 100dvh;
  background: var(--color-canvas);
}

.application-navigation {
  position: relative;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-block-size: 5rem;
  padding-inline: clamp(var(--space-lg), 3vw, var(--space-2xl));
  background: var(--color-canvas);
}

.application-navigation__brand {
  grid-column: 1;
  justify-self: start;
  color: var(--color-action-primary);
  font-family: var(--brand-font);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  line-height: 1;
  text-decoration: none;
}

.application-navigation__tools {
  grid-column: 3;
  display: flex;
  align-items: center;
  justify-self: end;
  gap: var(--space-md);
}

.application-navigation__menu {
  position: relative;
  z-index: 10;
}

.application-navigation__summary {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  min-block-size: 2.75rem;
  cursor: pointer;
  font-family: var(--brand-font);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  list-style: none;
}

.application-navigation__summary::-webkit-details-marker {
  display: none;
}

.primary-navigation {
  grid-column: 2;
  justify-self: center;
}

.primary-navigation__list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: 0;
  list-style: none;
}

.primary-navigation__item {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
  min-block-size: 2.75rem;
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  transition: color 150ms ease;
}

.primary-navigation__item--active {
  color: var(--color-action-primary);
}

.primary-navigation__label {
  position: relative;
}

.primary-navigation__label::after {
  position: absolute;
  inset-inline: 0;
  inset-block-end: -0.5rem;
  block-size: 2px;
  background: currentColor;
  content: "";
  opacity: 0;
  transform: translateY(-0.2rem);
  transition: opacity 150ms ease, transform 150ms ease;
}

.primary-navigation__item--active .primary-navigation__label::after {
  opacity: 1;
  transform: translateY(0);
}

@media (hover: hover) {
  a.primary-navigation__item:hover {
    color: var(--color-action-primary);
  }

  a.primary-navigation__item:hover .primary-navigation__label::after {
    opacity: 1;
    transform: translateY(0);
  }
}

.primary-navigation__item:focus-visible,
.application-navigation__brand:focus-visible,
.application-navigation__summary:focus-visible {
  border-radius: var(--radius-sm);
  outline: 3px solid var(--color-action-primary);
  outline-offset: 3px;
}

/* Keep the existing bell for future in-app notifications; see product-direction.md. */
.application-navigation__notifications,
.primary-navigation__notifications {
  display: none;
}

.context-label {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  max-inline-size: 24rem;
  color: var(--color-text-primary);
  font-family: var(--brand-font);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  white-space: nowrap;
}

.notification-indicator {
  display: flex;
  align-items: center;
  color: var(--color-text-secondary);
}

.notification-indicator--unread {
  color: var(--color-orange-900);
}

.notification-indicator__icon {
  position: relative;
  display: block;
}

.notification-indicator__badge {
  position: absolute;
  inset-inline-start: -0.55rem;
  inset-block-end: -0.25rem;
  display: grid;
  place-items: center;
  min-inline-size: 1.25rem;
  block-size: 1.25rem;
  padding-inline: 0.2rem;
  border-radius: var(--radius-pill);
  background: var(--color-orange-900);
  color: var(--color-neutral-0);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  line-height: 1;
}

.notification-indicator__label {
  font-weight: var(--font-weight-semibold);
}

@media (min-width: 53.125rem) {
  .primary-navigation__list {
    gap: var(--space-2xl);
  }
}

@media (max-width: 39.3125rem) {
  .application-shell:has(.primary-navigation) .application-shell__content {
    padding-block-end: calc(6rem + env(safe-area-inset-bottom));
  }

  .application-shell .application-shell__content > main:not(.settings-page) {
    padding-block-start: 0;
  }

  .application-shell .application-shell__content > .settings-page > .settings-page__header {
    padding-block-start: 0;
  }

  .application-navigation {
    grid-template-columns: 1fr;
    justify-items: center;
    min-block-size: 0;
    padding: var(--space-2xl) var(--space-md) var(--space-lg);
  }

  .application-navigation__brand {
    display: none;
  }

  .application-navigation__tools {
    grid-column: 1;
    grid-row: 1;
    justify-self: center;
  }

  .context-label {
    max-inline-size: calc(100vw - 2rem);
    font-size: var(--font-size-xl);
  }

  .primary-navigation {
    position: fixed;
    z-index: 30;
    inset-inline: 0;
    inset-block-end: 0;
    inline-size: 100%;
    padding-block: var(--space-xs) calc(var(--space-xs) + env(safe-area-inset-bottom));
    background: var(--color-surface-subtle);
    box-shadow: var(--shadow-bottom-navigation);
  }

  .primary-navigation__list {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    gap: 0;
  }

  .primary-navigation__item,
  .notification-indicator--labelled {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-2xs);
    min-block-size: 4.5rem;
    font-size: var(--font-size-xs);
  }

  .primary-navigation__label::after {
    display: none;
  }

  .application-navigation--without-group {
    grid-template-columns: auto minmax(0, 1fr);
    gap: var(--space-md);
    padding: var(--space-lg) var(--space-md);
  }

  .application-navigation--without-group .application-navigation__brand {
    display: block;
  }

  .application-navigation--without-group .application-navigation__tools {
    grid-column: 2;
    justify-self: end;
    min-inline-size: 0;
    max-inline-size: 100%;
  }

  .application-navigation--without-group .application-navigation__menu {
    min-inline-size: 0;
  }

  .application-navigation--without-group .context-menu__panel {
    inset-inline-start: auto;
    inset-inline-end: 0;
    max-inline-size: calc(100vw - var(--space-md) * 2);
    transform: none;
  }

  .application-navigation--without-group .context-label {
    display: block;
    overflow: hidden;
    font-size: var(--font-size-lg);
    text-overflow: ellipsis;
  }
}