/* ===== CASE PAGE ===== */
.case-page {
  padding-bottom: 0;
}

/* Hero */
.case-hero {
  padding-block: var(--space-16) 0;
}

.case-hero__back {
  margin-bottom: var(--space-8);
}

.case-hero__eyebrow {
  margin-bottom: var(--space-4);
}

.case-hero__title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
  margin-bottom: var(--space-6);
  max-width: 800px;
}

.case-hero__sub {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-bottom: var(--space-10);
}

.case-hero__cover {
  width: 100%;
  aspect-ratio: 16 / 6;
  overflow: hidden;
  margin-top: var(--space-10);
}

.case-hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Anchor nav */
.case-nav {
  position: sticky;
  top: 64px;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 90%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-4);
}

.case-nav__links {
  display: flex;
  gap: var(--space-8);
  overflow-x: auto;
  scrollbar-width: none;
}

.case-nav__links::-webkit-scrollbar {
  display: none;
}

.case-nav__link {
  font-size: var(--text-caption-size);
  font-weight: 500;
  color: var(--color-text-tertiary);
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--duration-fast);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}

.case-nav__link:hover,
.case-nav__link.active {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-accent);
}

/* Section */
.case-section {
  padding-block: var(--space-20);
}

.case-section--alt {
  background: var(--color-surface);
}

.case-section__header {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  margin-bottom: var(--space-10);
}

.case-section__num {
  font-size: var(--text-label-size);
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
  font-family: var(--font-ui);
}

.case-section__title {
  font-family: var(--font-display);
  font-size: var(--text-h2-size);
  font-weight: 400;
  color: var(--color-text-primary);
  line-height: 1.1;
  letter-spacing: -0.015em;
}

.case-section__subtitle {
  font-family: var(--font-ui);
  font-size: var(--text-h4-size);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-6);
}

/* Metadata grid */
.case-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-10);
}

.case-meta__item {
  background: var(--color-surface);
  padding: var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.case-meta__key {
  font-size: var(--text-label-size);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}

.case-meta__val {
  font-size: var(--text-body-size);
  color: var(--color-text-primary);
  font-weight: 500;
}

/* Text blocks */
.case-text {
  max-width: 720px;
}

.case-text--wide {
  max-width: 860px;
}

.case-text--narrow {
  max-width: 600px;
}

.case-text p {
  margin-bottom: var(--space-5);
}

.case-text p:last-child {
  margin-bottom: 0;
}

/* Columns */
.case-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
}

/* List */
.case-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.case-list li {
  font-size: var(--text-body-size);
  color: var(--color-text-secondary);
  padding-left: var(--space-5);
  position: relative;
  line-height: 1.55;
}

.case-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-text-tertiary);
}

/* Research grid */
.case-research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-block: var(--space-8);
}

.case-research-item {
  background: var(--color-bg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.case-research-item__label {
  font-size: var(--text-label-size);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}

.case-research-item__val {
  font-size: var(--text-h4-size);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.case-research-item p {
  font-size: var(--text-caption-size);
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin: 0;
}

/* Metrics */
.case-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.case-metric {
  background: var(--color-bg);
  padding: var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.case-metric__num {
  font-family: var(--font-display);
  font-style: normal;
  font-size: 3rem;
  line-height: 1;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}

.case-metric__label {
  font-size: var(--text-body-size);
  font-weight: 600;
  color: var(--color-text-primary);
  line-height: 1.3;
}

.case-metric__detail {
  font-size: var(--text-caption-size);
  color: var(--color-text-tertiary);
  line-height: 1.4;
}

/* Timeline */
.case-timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.case-timeline__item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-5);
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  align-items: baseline;
}

.case-timeline__item:first-child {
  border-top: 1px solid var(--color-border);
}

.case-timeline__date {
  font-size: var(--text-caption-size);
  color: var(--color-text-tertiary);
  font-weight: 500;
}

.case-timeline__event {
  font-size: var(--text-body-size);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Gallery */
.case-gallery {
  margin-top: var(--space-10);
}

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

.case-gallery__item--placeholder {
  aspect-ratio: 16 / 10;
  background: var(--color-surface-raised);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  font-size: var(--text-caption-size);
  border: 1px dashed var(--color-border-strong);
}

.case-gallery__item--placeholder:first-child:last-child {
  aspect-ratio: 16 / 6;
}

/* Next case */
.case-next {
  padding-block: var(--space-16);
  border-top: 1px solid var(--color-border);
}

.case-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  gap: var(--space-6);
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--duration-base);
}

.case-next__link:hover {
  border-bottom-color: var(--color-accent);
}

.case-next__link:hover .case-next__arrow {
  transform: translateX(8px);
}

.case-next__title {
  font-family: var(--font-display);
  font-size: var(--text-h3-size);
  color: var(--color-text-primary);
  line-height: 1.2;
}

.case-next__arrow {
  font-size: 1.5rem;
  color: var(--color-text-tertiary);
  display: inline-block;
  transition: transform var(--duration-base) var(--ease-standard),
              color var(--duration-fast);
  flex-shrink: 0;
}

.case-next__link:hover .case-next__arrow {
  color: var(--color-accent);
}

/* Responsive */
@media (max-width: 1024px) {
  .case-metrics {
    grid-template-columns: repeat(2, 1fr);
  }

  .case-columns {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

@media (max-width: 768px) {
  .case-meta {
    grid-template-columns: 1fr 1fr;
  }

  .case-research-grid {
    grid-template-columns: 1fr;
  }

  .case-metrics {
    grid-template-columns: 1fr 1fr;
  }

  .case-timeline__item {
    grid-template-columns: 100px 1fr;
    gap: var(--space-4);
  }

  .case-gallery--grid {
    grid-template-columns: 1fr;
  }

  .case-hero__title {
    font-size: 2.25rem;
  }

  .case-next__title {
    font-size: var(--text-h4-size);
  }
}

@media (max-width: 480px) {
  .case-meta {
    grid-template-columns: 1fr;
  }

  .case-metrics {
    grid-template-columns: 1fr;
  }
}