/* Case-study-specific styles. Shared design tokens, nav, footer, buttons,
   theme toggle, .reveal, and base typography live in
   /assets/css/styles.css. */

/* HERO */
.cs-hero {
  position: relative; z-index: 1;
  padding: 10rem 0 5rem;
}
.cs-back {
  display: inline-flex; align-items: center; gap: 0.4rem;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem; font-weight: 500;
  margin-bottom: 2rem;
  transition: color 0.3s var(--ease);
}
.cs-back:hover { color: var(--text); }
.cs-hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
}
.cs-hero h1 {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2.4rem, 4.5vw, 3.6rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0.5rem 0 1.25rem;
}
.cs-summary {
  color: var(--text-dim);
  font-size: 1.1rem;
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 520px;
}
.cs-meta {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 2rem;
  margin-bottom: 1.5rem;
}
.cs-meta-item span {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin-bottom: 0.3rem;
}
.cs-meta-item strong {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}
.cs-tags {
  display: flex; gap: 0.5rem; flex-wrap: wrap;
}
.cs-tags span {
  font-size: 0.72rem; font-weight: 500;
  padding: 0.3rem 0.8rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text-dim);
}
.cs-hero-image {
  position: relative;
  border: 1px solid rgba(255,255,255,0.06);
  overflow: hidden;
  background: var(--navy-mid);
}
.cs-hero-image img {
  width: 100%; height: auto;
  display: block;
}
[data-theme="light"] .cs-hero-image {
  border-color: rgba(0,0,0,0.07);
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}
[data-theme="light"] .cs-tags span {
  background: rgba(0,0,0,0.05);
  border-color: rgba(0,0,0,0.08);
}

/* NARRATIVE */
.cs-narrative { padding: 4rem 0; }
.cs-narrative .container { max-width: 760px; }
.cs-block { margin-bottom: 4rem; }
.cs-block:last-child { margin-bottom: 0; }
.cs-block h2 {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0.5rem 0 1.25rem;
}
.cs-block p {
  color: var(--text);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.25rem;
}
.cs-block p:last-child { margin-bottom: 0; }
.cs-block img {
  width: 100%; height: auto;
  display: block;
  margin: 2rem 0;
  border: 1px solid rgba(255,255,255,0.06);
}
[data-theme="light"] .cs-block img { border-color: rgba(0,0,0,0.07); }

/* TECH */
.cs-tech { padding: 5rem 0; }
.cs-tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}
.cs-tech-item {
  background: rgba(30, 39, 64, 0.5);
  border: 1px solid rgba(255,255,255,0.06);
  padding: 1.75rem;
}
[data-theme="light"] .cs-tech-item {
  background: rgba(255,255,255,0.75);
  border-color: rgba(0,0,0,0.07);
}
.cs-tech-item h3 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700; font-size: 1.05rem;
  margin-bottom: 0.4rem;
}
.cs-tech-item p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* TESTIMONIAL */
.cs-testimonial { padding: 5rem 0; }
.cs-testimonial-inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
  position: relative;
}
.cs-testimonial blockquote {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 1.5rem;
  font-style: italic;
}
.cs-testimonial cite {
  display: block;
  font-style: normal;
  color: var(--text-dim);
  font-size: 0.95rem;
}
.cs-testimonial cite strong {
  display: block;
  color: var(--text);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

/* NEXT / PREV */
.cs-next-prev {
  padding: 4rem 0;
  border-top: 1px solid rgba(255,255,255,0.06);
}
[data-theme="light"] .cs-next-prev { border-top-color: rgba(0,0,0,0.07); }
.cs-next-prev-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.cs-nav-card {
  display: block;
  padding: 1.75rem;
  background: rgba(30, 39, 64, 0.5);
  border: 1px solid rgba(255,255,255,0.06);
  color: var(--text);
  text-decoration: none;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.cs-nav-card:hover {
  transform: translateY(-3px);
  border-color: rgba(255,255,255,0.12);
  box-shadow: 0 12px 40px rgba(0,0,0,0.25);
}
[data-theme="light"] .cs-nav-card {
  background: rgba(255,255,255,0.75);
  border-color: rgba(0,0,0,0.07);
}
[data-theme="light"] .cs-nav-card:hover {
  border-color: rgba(0,0,0,0.12);
  box-shadow: 0 12px 40px rgba(0,0,0,0.1);
}
.cs-nav-card.next { text-align: right; }
.cs-nav-card .label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}
.cs-nav-card strong {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
}

/* CTA */
.cs-cta {
  padding: 6rem 0;
  text-align: center;
}
.cs-cta h2 {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}
.cs-cta p {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-bottom: 2rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* RESPONSIVE */
@media (max-width: 900px) {
  .cs-hero-inner { grid-template-columns: 1fr; gap: 2.5rem; }
  .cs-meta { gap: 1.25rem; }
}

@media (prefers-reduced-motion: reduce) {
  .cs-nav-card:hover { transform: none !important; }
}

@media (max-width: 768px) {
  .cs-hero { padding-top: 7rem; }
  .cs-next-prev-grid { grid-template-columns: 1fr; }
  .cs-nav-card.next { text-align: left; }
  .cs-meta { grid-template-columns: 1fr 1fr; }
}