/* ===== CASE STUDY — design system ===== */
:root {
  --cs-bg: #0a1a2a;
  --cs-bg-section: #0e1e2e;
  --cs-bg-card: #132030;
  --cs-bg-accent: #1a2d3d;
  --cs-fg: #e2eaf2;
  --cs-fg-muted: #7fa0b8;
  --cs-fg-dim: #4e6880;
  --cs-teal: #3dd9c0;
  --cs-gold: #e8a44a;
  --cs-radius: 12px;
  --cs-radius-lg: 20px;
  --cs-font-heading: 'Plus Jakarta Sans', sans-serif;
  --cs-font-body: 'DM Sans', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--cs-bg);
  color: var(--cs-fg);
  font-family: var(--cs-font-body);
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ===== NAV ===== */
.cs-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 18px 40px;
  background: rgba(10,26,42,0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.cs-nav-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cs-nav-brand {
  font-family: var(--cs-font-heading);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--cs-fg);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.cs-nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.cs-nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--cs-fg-muted);
  text-decoration: none;
  transition: color 0.2s;
}
.cs-nav-link:hover { color: var(--cs-fg); }

.cs-nav-cta {
  background: var(--cs-teal);
  color: #0a1a2a;
  font-family: var(--cs-font-heading);
  font-weight: 700;
  font-size: 0.88rem;
  padding: 10px 22px;
  border-radius: 100px;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.15s;
}
.cs-nav-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* ===== PILOT BANNER ===== */
.cs-pilot-banner {
  background: rgba(232,164,74,0.12);
  border-bottom: 1px solid rgba(232,164,74,0.3);
  padding: 12px 40px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 57px; /* nav height */
  font-size: 0.84rem;
  color: var(--cs-fg-muted);
  line-height: 1.5;
}

.cs-pilot-banner strong { color: var(--cs-gold); }
.cs-pilot-icon { font-size: 1rem; flex-shrink: 0; margin-top: 1px; }

/* ===== HERO ===== */
.cs-hero {
  padding: 80px 40px 80px;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(61,217,192,0.05) 0%, transparent 60%),
              var(--cs-bg-section);
}

.cs-hero-inner {
  max-width: 900px;
  margin: 0 auto;
}

.cs-meta-row {
  display: flex;
  gap: 12px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.cs-sector-tag,
.cs-date-tag {
  font-family: var(--cs-font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 100px;
}

.cs-sector-tag {
  background: rgba(61,217,192,0.12);
  color: var(--cs-teal);
  border: 1px solid rgba(61,217,192,0.2);
}

.cs-date-tag {
  background: rgba(255,255,255,0.05);
  color: var(--cs-fg-muted);
  border: 1px solid rgba(255,255,255,0.08);
}

.cs-hero h1 {
  font-family: var(--cs-font-heading);
  font-weight: 800;
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: 24px;
  color: var(--cs-fg);
}

.cs-accent { color: var(--cs-teal); }

.cs-hero-sub {
  font-size: 1.05rem;
  color: var(--cs-fg-muted);
  line-height: 1.65;
  max-width: 680px;
  margin-bottom: 48px;
}

.cs-hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.cs-hero-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.cs-hero-stat-num {
  font-family: var(--cs-font-heading);
  font-weight: 800;
  font-size: 2.4rem;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cs-teal);
}

.cs-hero-stat-accent .cs-hero-stat-num {
  color: var(--cs-gold);
}

.cs-hero-stat-label {
  font-size: 0.8rem;
  color: var(--cs-fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

/* ===== BODY / SECTIONS ===== */
.cs-body {
  padding: 0 40px 80px;
  background: var(--cs-bg);
}

.cs-body-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 80px;
  padding-top: 80px;
}

.cs-section {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.cs-section-label {
  font-family: var(--cs-font-heading);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cs-teal);
}

.cs-section h2 {
  font-family: var(--cs-font-heading);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--cs-fg);
  margin-top: -4px;
}

.cs-section p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--cs-fg-muted);
  max-width: 760px;
}

/* ===== PULL QUOTE ===== */
.cs-pull-quote {
  background: var(--cs-bg-card);
  border-left: 3px solid var(--cs-teal);
  border-radius: 0 var(--cs-radius) var(--cs-radius) 0;
  padding: 28px 32px;
  margin: 8px 0;
}

.cs-pull-quote p {
  font-family: var(--cs-font-heading);
  font-size: 1.05rem;
  font-style: italic;
  line-height: 1.65;
  color: var(--cs-fg);
  max-width: 680px;
  margin-bottom: 16px;
}

.cs-pull-quote footer {
  font-size: 0.82rem;
  color: var(--cs-fg-muted);
  font-style: normal;
}

.cs-pull-quote-accent {
  border-left-color: var(--cs-gold);
}

/* ===== APPROACH GRID ===== */
.cs-approach-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 8px 0;
}

.cs-approach-card {
  background: var(--cs-bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--cs-radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.2s;
}

.cs-approach-card:hover {
  border-color: rgba(61,217,192,0.2);
}

.cs-approach-num {
  font-family: var(--cs-font-heading);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cs-teal);
}

.cs-approach-card h3 {
  font-family: var(--cs-font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--cs-fg);
}

.cs-approach-card p {
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--cs-fg-muted);
}

.cs-approach-note {
  background: rgba(61,217,192,0.05);
  border: 1px solid rgba(61,217,192,0.12);
  border-radius: var(--cs-radius);
  padding: 20px 24px;
  font-size: 0.88rem !important;
  color: var(--cs-fg-muted) !important;
  font-style: italic;
}

/* ===== OUTCOMES GRID ===== */
.cs-outcomes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin: 8px 0;
}

.cs-outcome-block {
  background: var(--cs-bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--cs-radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cs-outcome-primary {
  border-color: rgba(61,217,192,0.2);
  background: rgba(61,217,192,0.06);
}

.cs-outcome-num {
  font-family: var(--cs-font-heading);
  font-weight: 800;
  font-size: 3rem;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--cs-teal);
}

.cs-outcome-primary .cs-outcome-num {
  color: var(--cs-gold);
}

.cs-outcome-desc {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--cs-fg-muted);
}

/* ===== PILLAR BARS ===== */
.cs-pillar-breakdown {
  background: var(--cs-bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--cs-radius-lg);
  padding: 32px;
}

.cs-pillar-bars {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 16px;
}

.cs-pillar-row {
  display: grid;
  grid-template-columns: 70px 1fr;
  align-items: center;
  gap: 16px;
}

.cs-pillar-name {
  font-family: var(--cs-font-heading);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--cs-fg-muted);
  text-align: right;
}

.cs-pillar-track {
  background: rgba(255,255,255,0.06);
  border-radius: 100px;
  height: 28px;
  position: relative;
  overflow: hidden;
}

.cs-pillar-bar {
  height: 100%;
  background: var(--cs-teal);
  border-radius: 100px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 10px;
  font-family: var(--cs-font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  color: #0a1a2a;
  min-width: fit-content;
  transition: width 0.6s ease;
}

.cs-pillar-bar-gold {
  background: var(--cs-gold);
}

.cs-pillar-note {
  font-size: 0.78rem !important;
  color: var(--cs-fg-dim) !important;
  font-style: italic;
  margin-top: 4px;
}

/* ===== TESTIMONIAL CARD ===== */
.cs-testimonial-card {
  background: var(--cs-bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--cs-radius-lg);
  padding: 48px 40px;
  position: relative;
}

.cs-testimonial-quote-mark {
  font-family: var(--cs-font-heading);
  font-size: 5rem;
  line-height: 1;
  color: var(--cs-teal);
  opacity: 0.3;
  font-weight: 800;
  position: absolute;
  top: 24px;
  left: 36px;
}

.cs-testimonial-card blockquote {
  margin-top: 24px;
}

.cs-testimonial-card blockquote p {
  font-size: 1.05rem !important;
  font-style: italic;
  line-height: 1.8;
  color: var(--cs-fg) !important;
  margin-bottom: 16px;
  max-width: 100% !important;
}

.cs-testimonial-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin-top: 8px;
}

.cs-testimonial-name {
  font-family: var(--cs-font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--cs-fg);
}

.cs-testimonial-role {
  font-size: 0.8rem;
  color: var(--cs-fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ===== LEARNINGS ===== */
.cs-learnings {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.cs-learning {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 24px;
  align-items: flex-start;
  padding: 32px;
  background: var(--cs-bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--cs-radius-lg);
  transition: border-color 0.2s;
}

.cs-learning:hover {
  border-color: rgba(61,217,192,0.15);
}

.cs-learning-num {
  font-family: var(--cs-font-heading);
  font-weight: 800;
  font-size: 1.6rem;
  color: var(--cs-teal);
  opacity: 0.4;
  line-height: 1;
  padding-top: 4px;
}

.cs-learning-content h3 {
  font-family: var(--cs-font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--cs-fg);
  margin-bottom: 12px;
}

.cs-learning-content p {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--cs-fg-muted);
  max-width: 100%;
}

/* ===== CTA SECTION ===== */
.cs-cta-section {
  background: radial-gradient(ellipse 80% 60% at 50% 50%, rgba(61,217,192,0.06) 0%, transparent 60%),
              var(--cs-bg-section);
  padding: 100px 40px;
  text-align: center;
}

.cs-cta-inner {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.cs-cta-inner h2 {
  font-family: var(--cs-font-heading);
  font-weight: 800;
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: var(--cs-fg);
}

.cs-cta-inner p {
  font-size: 1rem;
  color: var(--cs-fg-muted);
  line-height: 1.7;
  max-width: 540px;
}

.cs-cta-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 8px;
}

.cs-cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--cs-teal);
  color: #0a1a2a;
  font-family: var(--cs-font-heading);
  font-weight: 700;
  font-size: 1rem;
  padding: 16px 32px;
  border-radius: 100px;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.15s;
}
.cs-cta-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.cs-cta-secondary {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--cs-fg-muted);
  font-family: var(--cs-font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 16px 28px;
  border-radius: 100px;
  border: 1px solid rgba(255,255,255,0.12);
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
}
.cs-cta-secondary:hover {
  border-color: rgba(255,255,255,0.25);
  color: var(--cs-fg);
}

.cs-cta-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 8px;
}

.cs-badge {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 100px;
  padding: 7px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--cs-font-heading);
  color: var(--cs-fg-muted);
}

/* ===== FOOTER ===== */
.cs-footer {
  background: #070f18;
  padding: 36px 40px;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.cs-footer-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.cs-footer-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cs-footer-name {
  font-family: var(--cs-font-heading);
  font-weight: 800;
  font-size: 1rem;
  color: var(--cs-fg);
}

.cs-footer-tag {
  font-size: 0.75rem;
  color: var(--cs-fg-dim);
}

.cs-footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.cs-footer-links a {
  font-size: 0.82rem;
  color: var(--cs-fg-muted);
  text-decoration: none;
  transition: color 0.2s;
}
.cs-footer-links a:hover { color: var(--cs-fg); }

/* ===== RESPONSIVE ===== */
@media (max-width: 720px) {
  .cs-nav { padding: 16px 20px; }
  .cs-pilot-banner { padding: 12px 20px; }
  .cs-hero { padding: 60px 20px; }
  .cs-body { padding: 0 20px 60px; }
  .cs-body-inner { padding-top: 60px; gap: 60px; }
  .cs-approach-grid { grid-template-columns: 1fr; }
  .cs-outcomes-grid { grid-template-columns: 1fr; }
  .cs-learning { grid-template-columns: 40px 1fr; gap: 16px; padding: 24px 20px; }
  .cs-testimonial-card { padding: 32px 24px; }
  .cs-cta-section { padding: 60px 20px; }
  .cs-footer { padding: 28px 20px; }
  .cs-footer-inner { flex-direction: column; align-items: flex-start; }
  .cs-hero-stats { gap: 20px; }
}

@media (max-width: 480px) {
  .cs-pillar-row { grid-template-columns: 60px 1fr; }
  .cs-outcomes-grid { grid-template-columns: 1fr; }
}