/* ========================================
   Case Studies Page
   ======================================== */

/* ---- Hero ---- */

.cs-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 9rem 2rem 4rem;
  background: var(--color-surface);
}

.cs-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.cs-hero__intro {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  color: var(--color-text-muted);
  max-width: 520px;
  line-height: 1.7;
}

/* ---- Sections ---- */

.cs-section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem 2rem;
}

.cs-section:last-of-type {
  padding-bottom: 5rem;
}

.cs-section__heading {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

/* ---- Card Grid ---- */

.cs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

/* ---- Card ---- */

.cs-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform 0.5s var(--ease-out-expo),
              box-shadow 0.4s ease;
}

.cs-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
}

.cs-card__tag {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  opacity: 0.55;
}

.cs-card__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.cs-card__desc {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---- Stagger delay for 3 columns ---- */

.stagger > .fade-up:nth-child(1) { transition-delay: 0s; }
.stagger > .fade-up:nth-child(2) { transition-delay: 0.1s; }
.stagger > .fade-up:nth-child(3) { transition-delay: 0.2s; }

.cs-card--linked {
  text-decoration: none;
  color: var(--color-text);
  cursor: pointer;
  transition: transform 0.4s var(--ease-out-expo), border-color 0.3s ease, box-shadow 0.3s ease;
}

.cs-card--linked:hover {
  transform: translateY(-3px);
  border-color: var(--color-text-muted);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.cs-card__tag--live {
  color: #16a34a;
  opacity: 1;
}

.cs-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--color-text);
  margin-top: auto;
  padding-top: 0.5rem;
  transition: gap 0.3s var(--ease-out-expo);
}

.cs-card--linked:hover .cs-card__link {
  gap: 0.7rem;
}

/* ---- Responsive ---- */

@media (max-width: 900px) {
  .cs-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .cs-hero {
    padding: 7rem 1.5rem 3rem;
  }

  .cs-section {
    padding: 3rem 1.25rem 1.5rem;
  }

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

  .cs-card {
    padding: 1.5rem 1.25rem;
  }
}