/* ═══════════════════════════════════════════════════════════
   case-study.css  —  Phase 4 project case study page styles
   Extends style.css + projects.css. No overrides to existing
   design tokens — uses the same CSS custom properties.
   ═══════════════════════════════════════════════════════════ */

/* ── Breadcrumb ─────────────────────────────────────────── */
.cs-breadcrumb {
  position: relative;
  top: auto;
  left: auto;
  right: auto;
  z-index: auto;
  display: block;
  justify-content: initial;
  align-items: initial;
  padding: 12px 24px;
  background: transparent;
  backdrop-filter: none;
  border-bottom: 1px solid var(--border);
}
.cs-breadcrumb-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.cs-breadcrumb-list a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}
.cs-breadcrumb-list a:hover { color: var(--blue); }
.cs-breadcrumb-list [aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

/* ── Hero ───────────────────────────────────────────────── */
.cs-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px 48px;
}
@media (max-width: 860px) {
  .cs-hero { grid-template-columns: 1fr; padding: 40px 20px 32px; gap: 28px; }
}
.cs-hero-inner { display: flex; flex-direction: column; gap: 20px; }
.cs-hero-meta  { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.cs-category-badge {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--blue), var(--green));
  color: #000;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.cs-tag {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 50px;
  border: 1px solid var(--glass-border);
  color: var(--text-muted);
  background: var(--glass);
}

.cs-hero-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--text);
  margin: 0;
}
.cs-hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin: 0;
  max-width: 540px;
}

.cs-summary-block {
  background: rgba(212,175,55,0.04);
  border: 1px solid rgba(212,175,55,0.14);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
  padding: 20px 22px;
  max-width: 620px;
}
.cs-summary-block p {
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.65;
  margin: 0;
}
.cs-summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
  margin-top: 22px;
}
.cs-summary-fact {
  background: rgba(255,255,255,0.025);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 15px 16px;
}
.cs-summary-label {
  display: block;
  color: var(--blue);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.cs-summary-value {
  display: block;
  color: var(--text);
  font-size: 0.88rem;
  line-height: 1.55;
}

.cs-hero-img-wrap {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  background: var(--bg2);
  aspect-ratio: 16/9;
}
.cs-hero-img-wrap picture, .cs-hero-img-wrap img {
  width: 100%; height: 100%; object-fit: cover; display: block;
}

/* ── Stats bar ──────────────────────────────────────────── */
.cs-stats {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  padding: 20px 0 4px;
}
.cs-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.cs-stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--blue);
  line-height: 1;
}
.cs-stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Action buttons ─────────────────────────────────────── */
.cs-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 4px;
}
.cs-action-btn {
  font-size: 0.92rem;
  padding: 11px 24px;
}

/* ── Gallery ────────────────────────────────────────────── */
.cs-gallery {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 48px;
}
.cs-gallery-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 12px;
}
.cs-gallery-item {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--glass-border);
  background: var(--bg2);
  margin: 0;
  aspect-ratio: 16/9;
}
.cs-gallery-item--main {
  grid-row: span 2;
  aspect-ratio: auto;
}
.cs-gallery-item picture, .cs-gallery-item img {
  width: 100%; height: 100%; object-fit: cover; display: block;
}
@media (max-width: 700px) {
  .cs-gallery-grid { grid-template-columns: 1fr 1fr; }
  .cs-gallery-item--main { grid-column: span 2; grid-row: auto; aspect-ratio: 16/9; }
}

/* ── Content sections ───────────────────────────────────── */
.cs-main { max-width: 1200px; margin: 0 auto; padding: 0 24px 80px; }

.cs-section {
  padding: 56px 0;
  border-top: 1px solid var(--border);
}
.cs-section:first-child { border-top: none; }
.cs-section-inner { max-width: 800px; }

.cs-section-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--blue);
  margin-bottom: 10px;
}
.cs-section-title {
  font-size: clamp(1.35rem, 2.5vw, 1.9rem);
  font-weight: 800;
  color: var(--text);
  margin: 0 0 18px;
  line-height: 1.25;
}
.cs-section-body {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin: 0 0 20px;
}

/* ── Features list ──────────────────────────────────────── */
.cs-features-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.cs-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.6;
}
.cs-features-list li::before {
  content: '✓';
  color: var(--blue);
  font-weight: 800;
  font-size: 0.9rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.cs-answer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.cs-answer-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.cs-answer-card h3 {
  color: var(--text);
  font-size: 0.95rem;
  margin: 0 0 8px;
}
.cs-answer-card p {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.65;
  margin: 0;
}
.cs-faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 24px;
  max-width: 820px;
}
.cs-faq-item {
  border-top: 1px solid var(--border);
  padding: 18px 0;
}
.cs-faq-item:last-child { border-bottom: 1px solid var(--border); }
.cs-faq-item h3 {
  color: var(--text);
  font-size: 0.98rem;
  margin: 0 0 8px;
}
.cs-faq-item p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
}

/* ── Tech stack ─────────────────────────────────────────── */
.cs-tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}
.cs-tech-badge {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 8px;
  background: var(--bg2);
  border: 1px solid var(--glass-border);
  color: var(--text);
  letter-spacing: 0.01em;
  transition: border-color 0.2s, color 0.2s;
}
.cs-tech-badge:hover {
  border-color: var(--blue);
  color: var(--blue);
}

/* ── Results ────────────────────────────────────────────── */
.cs-results .cs-stats {
  gap: 40px;
  padding: 16px 0 0;
}
.cs-results .cs-stat-num { font-size: 2.4rem; }

/* ── Related projects ───────────────────────────────────── */
.cs-related {
  padding: 56px 0;
  border-top: 1px solid var(--border);
}
.cs-related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 24px;
}
.cs-related-card {
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}
.cs-related-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}
.cs-related-link {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  height: 100%;
}
.cs-related-img {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg2);
}
.cs-related-img picture, .cs-related-img img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform 0.3s;
}
.cs-related-card:hover .cs-related-img img { transform: scale(1.04); }
.cs-related-body {
  padding: 18px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}
.cs-related-cat {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue);
}
.cs-related-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin: 0;
  line-height: 1.3;
}
.cs-related-desc {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
  flex: 1;
}
.cs-related-cta {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--blue);
  margin-top: 6px;
}

/* ── Cross-category discover ────────────────────────────── */
.cs-discover { padding: 48px 0; border-top: 1px solid var(--border); }
.cs-discover-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 20px;
}
.cs-discover-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  border-radius: 12px;
  text-decoration: none;
  color: var(--text-muted);
  flex: 1;
  min-width: 220px;
  transition: color 0.2s, border-color 0.2s, transform 0.2s;
}
.cs-discover-link:hover {
  color: var(--text);
  border-color: var(--blue);
  transform: translateY(-2px);
}
.cs-discover-cat {
  font-size: 0.75rem;
  color: var(--blue);
  font-weight: 700;
  flex-shrink: 0;
}
.cs-discover-name {
  font-size: 0.88rem;
  font-weight: 600;
  flex: 1;
}
.cs-discover-arrow { color: var(--blue); font-size: 1rem; flex-shrink: 0; }

/* ── CTA section ────────────────────────────────────────── */
.cs-cta-section {
  padding: 56px 0 0;
  border-top: 1px solid var(--border);
}
.cs-cta-inner {
  border-radius: 20px;
  padding: 48px 40px;
  text-align: center;
  background: var(--glass);
  border: 1px solid var(--glass-border);
}
@media (max-width: 600px) { .cs-cta-inner { padding: 32px 20px; } }
.cs-cta-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--text);
  margin: 0 0 14px;
}
.cs-cta-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin: 0 auto 28px;
  max-width: 520px;
}
.cs-cta-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.cs-cta-note {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin: 0;
}

/* ── Mobile nav simple override for standalone pages ─────── */
@media (max-width: 860px) {
  .cs-gallery-grid { grid-template-columns: 1fr; }
  .cs-gallery-item--main { grid-column: auto; }
}