.app-shell {
  position: relative;
  z-index: 1;
  width: min(calc(100% - (var(--shell-gutter) * 2)), var(--shell-max-width));
  margin: 0 auto;
  padding: var(--space-6) 0 var(--space-8);
}

.shell-header,
.primary-nav,
.page-header,
.card,
.empty-state,
.task-row,
.carousel {
  backdrop-filter: blur(14px);
}

.shell-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-5);
  padding: var(--space-5);
}

.brand-lockup {
  display: grid;
  gap: var(--space-2);
  max-width: 44rem;
}

.brand-lockup__eyebrow,
.section-kicker {
  font-size: var(--font-size-00);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-soft);
}

.brand-lockup__name,
.page-header__title,
.section-heading--large {
  margin: 0;
  font-family: var(--font-display);
  color: var(--color-heading);
}

.brand-lockup__name {
  font-size: clamp(1.8rem, 1.4rem + 2vw, 3rem);
  line-height: var(--line-height-tight);
}

.brand-lockup__tagline,
.page-header__body,
.card__body,
.empty-state__body,
.timeline-event__body,
.section-header__note,
.carousel__body,
.carousel__meta,
.carousel__hint {
  margin: 0;
  color: var(--color-text-muted);
}

.primary-nav {
  position: sticky;
  top: var(--space-3);
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0 0 var(--space-6);
  padding: var(--space-2);
  min-height: var(--nav-height);
  align-items: center;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-round);
  box-shadow: var(--shadow-sm);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.6rem;
  padding: 0 var(--space-4);
  border-radius: var(--radius-round);
  color: var(--color-text-muted);
  transition:
    background var(--motion-fast),
    color var(--motion-fast),
    transform var(--motion-fast);
}

.nav-link:hover,
.nav-link:focus-visible {
  background: var(--color-accent-soft);
  color: var(--color-heading);
  transform: translateY(-1px);
}

.nav-link--active {
  background: var(--color-surface-strong);
  color: var(--color-heading);
  box-shadow: inset 0 0 0 1px var(--color-border);
}

.page-header {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(18rem, 0.95fr);
  gap: var(--space-5);
  align-items: stretch;
  margin-bottom: var(--space-7);
}

.page-header__content,
.page-header__panel {
  padding: var(--space-6);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
}

.page-header__content {
  display: grid;
  gap: var(--space-4);
}

.page-header__title {
  font-size: var(--font-size-4);
  max-width: 12ch;
}

.page-header__actions {
  display: grid;
  gap: var(--space-3);
  padding-top: var(--space-3);
}

.section-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.section-heading {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--font-size-2);
  color: var(--color-heading);
}

.section-heading--large {
  font-size: var(--font-size-3);
}

.content-section {
  margin-bottom: var(--space-7);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.content-section--split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.card,
.carousel {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.card--soft {
  background: var(--color-bg-elevated);
}

.card__header,
.carousel__header,
.carousel__status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.card__title,
.timeline-event__title,
.empty-state__title,
.carousel__title {
  margin: 0;
  font-weight: 700;
  color: var(--color-heading);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2rem;
  padding: 0 var(--space-3);
  border-radius: var(--radius-round);
  background: var(--color-accent-soft);
  color: var(--color-accent-strong);
  border: 1px solid var(--color-border);
  font-size: var(--font-size-00);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.status-badge--accent {
  background: var(--color-accent);
  color: var(--color-surface-strong);
  border-color: transparent;
}

.status-badge--quiet {
  background: transparent;
  color: var(--color-text-soft);
}

.task-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}

.task-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.task-row__label {
  font-size: var(--font-size-0);
  font-weight: 700;
  color: var(--color-heading);
}

.task-row__value {
  max-width: 28rem;
  color: var(--color-text-muted);
  text-align: right;
}

.timeline-event {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-3);
  align-items: start;
}

.timeline-event__marker {
  width: 0.85rem;
  height: 0.85rem;
  margin-top: 0.4rem;
  border-radius: var(--radius-round);
  background: var(--color-accent);
  box-shadow: 0 0 0 0.35rem var(--color-accent-soft);
}

.empty-state {
  padding: var(--space-4);
  background: var(--color-bg-elevated);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-md);
}

.carousel__controls {
  display: flex;
  gap: var(--space-2);
}

.carousel__button {
  min-height: 2.6rem;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-round);
  background: var(--color-bg-elevated);
  color: var(--color-heading);
  cursor: pointer;
  transition:
    transform var(--motion-fast),
    border-color var(--motion-fast),
    background var(--motion-fast);
}

.carousel__button:hover,
.carousel__button:focus-visible {
  transform: translateY(-1px);
  background: var(--color-accent-soft);
  border-color: var(--color-border-strong);
}

.carousel__button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

.carousel__viewport {
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.carousel__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(100%, 1fr);
  transition: transform var(--motion-slow);
}

.carousel__slide {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(16rem, 0.9fr);
  gap: var(--space-5);
  align-items: center;
  padding: var(--space-2);
}

.carousel__frame {
  padding: clamp(0.8rem, 2vw, 1.4rem);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: calc(var(--radius-lg) + 0.25rem);
  box-shadow: var(--shadow-sm);
}

.carousel__image {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  background:
    linear-gradient(135deg, var(--color-bg-strong), var(--color-surface)),
    var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.carousel__image::before,
.carousel__image::after {
  content: "";
  position: absolute;
  inset: auto;
  border-radius: var(--radius-round);
  background: var(--color-accent-soft);
}

.carousel__image::before {
  width: 12rem;
  height: 12rem;
  top: -3rem;
  right: -2rem;
}

.carousel__image::after {
  width: 8rem;
  height: 8rem;
  left: -1rem;
  bottom: -2rem;
}

.carousel__image--portrait {
  aspect-ratio: 4 / 5;
}

.carousel__image--landscape {
  aspect-ratio: 16 / 10;
}

.carousel__image--detail {
  aspect-ratio: 3 / 2;
}

.carousel__placeholder-label {
  position: relative;
  z-index: 1;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-round);
  background: var(--color-bg-elevated);
  color: var(--color-heading);
  font-size: var(--font-size-0);
  font-weight: 700;
}

.carousel__caption {
  display: grid;
  gap: var(--space-3);
}

.carousel__status {
  flex-wrap: wrap;
}

@media (max-width: 960px) {
  .page-header,
  .card-grid,
  .content-section--split,
  .carousel__slide {
    grid-template-columns: 1fr;
  }

  .section-header,
  .shell-header,
  .carousel__header {
    align-items: start;
    flex-direction: column;
  }

  .task-row__value {
    text-align: left;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding-top: var(--space-4);
  }

  .page-header__content,
  .page-header__panel,
  .card,
  .carousel,
  .shell-header {
    padding: var(--space-4);
    border-radius: var(--radius-lg);
  }

  .primary-nav {
    top: var(--space-2);
  }

  .nav-link,
  .carousel__button {
    width: 100%;
    justify-content: center;
  }

  .carousel__controls {
    width: 100%;
    flex-direction: column;
  }
}