/* ═══════════════════════════════════════════════════════
   CASE STUDY PAGE, Premium Editorial Design
   Taste-skill: DESIGN_VARIANCE:7 | MOTION:5 | DENSITY:4
   ═══════════════════════════════════════════════════════ */

/* ── Hero ─────────────────────────────────────────────── */
.cs-hero {
  background: var(--navy);
  padding: 9rem 0 5rem;
  position: relative;
  overflow: hidden;
}
.cs-hero::before {
  content: '';
  position: absolute;
  top: -120px; right: -120px;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245,194,0,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.cs-hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(196,154,26,0.4), transparent);
}
.cs-hero-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 3rem;
}
.cs-hero-label {
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.cs-hero-label::before {
  content: '';
  display: block;
  width: 20px; height: 2px;
  background: var(--gold);
  border-radius: 1px;
}
.cs-hero-title {
  font-family: var(--serif);
  font-size: clamp(2.8rem, 5.5vw, 5rem);
  font-weight: 400;
  color: #fff;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1.2rem;
}
.cs-hero-sub {
  font-family: var(--body);
  font-size: 1rem;
  color: rgba(255,255,255,0.45);
  font-weight: 300;
  margin-bottom: 2rem;
  letter-spacing: 0.01em;
}
.cs-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.cs-hero-tags .cap-tag {
  background: rgba(196,154,26,0.15);
  border-color: rgba(196,154,26,0.3);
  color: var(--gold);
}

/* ── Stats bar ────────────────────────────────────────── */
.cs-stats-bar {
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
}
.cs-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  divide-x: 1px solid var(--rule);
}
.cs-stat {
  padding: 2.2rem 2.5rem;
  border-right: 1px solid var(--rule);
  transition: background 0.2s;
}
.cs-stat:last-child { border-right: none; }
.cs-stat:hover { background: var(--gold-bg); }
.cs-stat-num {
  font-family: var(--serif);
  font-size: 2.8rem;
  font-weight: 400;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 0.3rem;
}
.cs-stat-label {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--slate-mid);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Body layout ──────────────────────────────────────── */
.cs-body {
  padding: 6rem 0;
  background: var(--bg);
}
.cs-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 5rem;
  align-items: start;
}

/* ── Main article ─────────────────────────────────────── */
.cs-section {
  margin-bottom: 3.5rem;
}
.cs-section-label {
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.cs-section-label::before {
  content: '';
  display: block;
  width: 14px; height: 2px;
  background: var(--gold);
  border-radius: 1px;
}
.cs-section-title {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 400;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: 1.2rem;
  letter-spacing: -0.01em;
}
.cs-main p {
  font-family: var(--body);
  font-size: 1rem;
  font-weight: 300;
  color: var(--slate);
  line-height: 1.9;
  margin-bottom: 1.2rem;
  max-width: 68ch;
}

/* ── Pull quote ───────────────────────────────────────── */
.cs-pullquote {
  margin: 2.5rem 0;
  padding: 2rem 2.5rem;
  border-left: 3px solid var(--gold);
  background: var(--gold-bg);
  border-radius: 0 6px 6px 0;
  font-family: var(--serif);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--navy);
  line-height: 1.55;
}

/* ── Process steps ────────────────────────────────────── */
.cs-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--rule);
  border-radius: 8px;
  overflow: hidden;
  margin: 2.5rem 0;
}
.cs-step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 1.5rem;
  padding: 1.8rem 2rem;
  border-bottom: 1px solid var(--rule);
  align-items: start;
  transition: background 0.2s;
}
.cs-step:last-child { border-bottom: none; }
.cs-step:hover { background: var(--gold-bg); }
.cs-step-num {
  font-family: var(--serif);
  font-size: 1.8rem;
  color: var(--gold);
  font-weight: 400;
  line-height: 1;
  padding-top: 0.15rem;
}
.cs-step-title {
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.4rem;
}
.cs-step-body {
  font-family: var(--body);
  font-size: 0.87rem;
  color: var(--slate);
  line-height: 1.75;
  margin: 0 !important;
  max-width: none !important;
}

/* ── Sidebar ──────────────────────────────────────────── */
.cs-sidebar-new {
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.cs-sidebar-card {
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1.8rem;
  box-shadow: var(--shadow);
}
.cs-sidebar-card-label {
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.2rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--rule);
}
.cs-sidebar-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--rule);
}
.cs-sidebar-key {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--slate-light);
  flex-shrink: 0;
  width: 80px;
}
.cs-sidebar-val {
  font-family: var(--body);
  font-size: 0.82rem;
  color: var(--slate);
  text-align: right;
  line-height: 1.4;
}
.cs-sidebar-cta {
  background: var(--navy);
  border-radius: 8px;
  padding: 1.8rem;
}
.cs-sidebar-cta-title {
  font-family: var(--serif);
  font-size: 1.2rem;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 0.8rem;
}
.cs-sidebar-cta p {
  font-family: var(--body);
  font-size: 0.83rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.65;
  margin: 0;
}
.cs-capability-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.cs-capability-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--body);
  font-size: 0.83rem;
  color: var(--slate);
}
.cs-capability-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--gold);
  flex-shrink: 0;
}

/* ── Key fact highlight ───────────────────────────────── */
.cs-highlight-box {
  background: var(--navy);
  border-radius: 8px;
  padding: 2.2rem 2.5rem;
  margin: 2.5rem 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
.cs-highlight-item {}
.cs-highlight-num {
  font-family: var(--serif);
  font-size: 3rem;
  color: var(--gold-bright);
  line-height: 1;
  margin-bottom: 0.3rem;
}
.cs-highlight-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  color: rgba(255,255,255,0.55);
  line-height: 1.5;
}

/* ── Related ──────────────────────────────────────────── */
.cs-related {
  background: var(--bg-2);
  border-top: 1px solid var(--rule);
  padding: 5rem 0;
}
.cs-related-header {
  margin-bottom: 2.5rem;
}
.cs-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.cs-related-card {
  display: block;
  text-decoration: none;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
}
.cs-related-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold-bright));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}
.cs-related-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--gold-line-strong);
}
.cs-related-card:hover::before { transform: scaleX(1); }
.cs-related-card-label {
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.7rem;
}
.cs-related-card-title {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--navy);
  line-height: 1.35;
  margin-bottom: 1.5rem;
}
.cs-related-card-arrow {
  font-size: 1.2rem;
  color: var(--gold);
  transition: transform 0.2s;
}
.cs-related-card:hover .cs-related-card-arrow {
  transform: translateX(4px);
}

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 1024px) {
  .cs-layout { grid-template-columns: 1fr; gap: 3rem; }
  .cs-sidebar-new { position: static; }
  .cs-hero-inner { padding: 0 1.5rem; }
  .cs-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .cs-related-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .cs-hero { padding: 8rem 0 3.5rem; }
  .cs-hero-title { font-size: 2.6rem; }
  .cs-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .cs-related-grid { grid-template-columns: 1fr; }
  .cs-highlight-box { grid-template-columns: 1fr; }
  .cs-step { grid-template-columns: 44px 1fr; gap: 1rem; }
}