/* ============================================
   CASE STUDY — Project detail page
   ============================================ */

.cs-hero {
  padding-top: calc(var(--nav-h) + var(--s-80));
  padding-bottom: var(--s-64);
  border-bottom: 1px solid var(--c-border);
}

.cs-hero__back {
  display: inline-flex;
  align-items: center;
  gap: var(--s-8);
  font-family: var(--f-mono);
  font-size: var(--ts-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-text-tertiary);
  margin-bottom: var(--s-48);
  transition: color var(--t-fast);
}

.cs-hero__back:hover {
  color: var(--c-text);
}

.cs-hero__meta {
  display: flex;
  align-items: center;
  gap: var(--s-24);
  margin-bottom: var(--s-24);
}

.cs-hero__number {
  font-family: var(--f-mono);
  font-size: var(--ts-sm);
  color: var(--c-text-tertiary);
  letter-spacing: 0.05em;
}

.cs-hero__category {
  font-family: var(--f-mono);
  font-size: var(--ts-2xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--c-text-tertiary);
}

.cs-hero__title {
  font-size: clamp(var(--ts-3xl), 4vw, var(--ts-5xl));
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
  margin-bottom: var(--s-24);
}

.cs-hero__desc {
  font-size: var(--ts-md);
  line-height: var(--lh-relaxed);
  color: var(--c-text-secondary);
  max-width: 60ch;
}

/* ── Case Study Content ── */

.cs-content {
  padding-block: var(--s-80);
}

.cs-block {
  margin-bottom: var(--s-64);
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--s-32);
  max-width: var(--max-w-narrow);
}

.cs-block:last-child {
  margin-bottom: 0;
}

.cs-block--wide {
  max-width: 100%;
}

.cs-block__label {
  font-family: var(--f-mono);
  font-size: var(--ts-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-text-tertiary);
  padding-top: 4px;
}

.cs-block__body {
  font-size: var(--ts-md);
  line-height: var(--lh-relaxed);
  color: var(--c-text-secondary);
}

.cs-block__body ul {
  display: flex;
  flex-direction: column;
  gap: var(--s-8);
}

.cs-block__body li {
  padding-left: var(--s-20);
  position: relative;
}

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

/* ── Gallery ── */

.cs-gallery {
  margin-block: var(--s-64);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-24);
}

.cs-gallery__item {
  border: 1px solid var(--c-border);
  overflow: hidden;
  background: var(--c-bg-alt);
}

.cs-gallery__item img {
  width: 100%;
  height: auto;
  display: block;
}

/* ── Live Project Link ── */

.cs-live {
  padding-block: var(--s-48);
  border-top: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.cs-live__label {
  font-family: var(--f-mono);
  font-size: var(--ts-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-text-tertiary);
}

/* ── Project Navigation ── */

.cs-nav {
  padding-block: var(--s-48);
  border-top: 1px solid var(--c-border);
  display: flex;
  justify-content: space-between;
}

.cs-nav__item {
  display: flex;
  flex-direction: column;
  gap: var(--s-8);
}

.cs-nav__item--next {
  text-align: right;
}

.cs-nav__label {
  font-family: var(--f-mono);
  font-size: var(--ts-2xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-text-tertiary);
}

.cs-nav__title {
  font-size: var(--ts-lg);
  font-weight: var(--fw-medium);
  transition: color var(--t-fast);
}

.cs-nav__item:hover .cs-nav__title {
  color: var(--c-accent);
}


/* ── Case Study Responsive ── */

@media (max-width: 768px) {
  .cs-hero {
    padding-top: calc(var(--nav-h) + var(--s-48));
  }

  .cs-block {
    grid-template-columns: 1fr;
    gap: var(--s-12);
  }

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

  .cs-live {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--s-16);
  }

  .cs-nav {
    flex-direction: column;
    gap: var(--s-32);
  }

  .cs-nav__item--next {
    text-align: left;
  }
}