/* ===== NAV ===== */
.cs-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 0 80px;
}

.cs-nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.cs-logo {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}

.cs-nav-links {
  display: flex;
  gap: 32px;
}

.cs-nav-link {
  font-size: 13px;
  font-weight: 400;
  color: var(--mid);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.15s;
}

.cs-nav-link:hover, .cs-nav-link.active { color: var(--ink); }

/* ===== HERO ===== */
.cs-hero {
  padding: 100px 80px 80px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

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

.cs-hero-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.cs-hero-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--accent);
}

.cs-hero-headline {
  font-family: var(--font-head);
  font-size: clamp(30px, 4.5vw, 56px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 24px;
}

.cs-hero-meta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.cs-meta-client {
  font-size: 15px;
  color: var(--mid);
  font-weight: 400;
}

/* ===== SECTIONS ===== */
.cs-section {
  padding: 80px;
  border-bottom: 1px solid var(--border);
}

.cs-section-inner {
  max-width: 900px;
}

.cs-section-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 32px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.cs-section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--accent);
}

/* ===== CHALLENGE ===== */
.cs-challenge {
  background: var(--surface);
}

.cs-challenge-body p {
  font-size: 17px;
  line-height: 1.75;
  color: #5A5550;
  font-weight: 300;
  max-width: 720px;
}

/* ===== APPROACH ===== */
.cs-approach {
  background: var(--bg);
}

.cs-approach-table {
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 48px;
}

.cs-approach-table-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 12px 24px;
  background: var(--muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mid);
}

.cs-approach-table-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
}

.cs-approach-cat {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.cs-approach-vol {
  font-size: 14px;
  color: #5A5550;
  font-weight: 400;
}

.cs-workflow {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cs-workflow-step {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.cs-workflow-step:first-child { border-top: 1px solid var(--border); }

.cs-step-num {
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 800;
  color: var(--accent);
  min-width: 32px;
  padding-top: 2px;
}

.cs-step-label {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.cs-step-desc {
  font-size: 14px;
  line-height: 1.65;
  color: #5A5550;
  font-weight: 300;
}

/* ===== RESULTS ===== */
.cs-results {
  background: var(--ink);
  color: #fff;
}

.cs-results .cs-section-label {
  color: rgba(255,255,255,0.5);
}

.cs-results .cs-section-label::before {
  background: var(--accent);
}

.cs-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.cs-metric {
  padding: 32px 24px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 4px;
  border-top: 3px solid var(--accent);
}

.cs-metric-num {
  font-family: var(--font-head);
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 12px;
}

.cs-metric-label {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(255,255,255,0.55);
  font-weight: 300;
}

/* ===== QUOTE ===== */
.cs-quote-section {
  background: var(--surface);
}

.cs-quote {
  max-width: 800px;
}

.cs-quote-mark {
  font-family: var(--font-head);
  font-size: 80px;
  font-weight: 800;
  color: var(--accent);
  line-height: 0.6;
  margin-bottom: 24px;
  display: block;
}

.cs-quote-text {
  font-family: var(--font-head);
  font-size: clamp(18px, 2.5vw, 26px);
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-bottom: 36px;
  border-left: 4px solid var(--accent);
  padding-left: 36px;
}

.cs-quote-attribution {
  display: flex;
  align-items: center;
  gap: 16px;
}

.cs-quote-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  flex-shrink: 0;
}

.cs-quote-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.cs-quote-role {
  font-size: 13px;
  color: var(--mid);
  margin-top: 2px;
}

/* ===== CTA ===== */
.cs-cta {
  padding: 100px 80px;
  background: var(--ink);
  color: #fff;
}

.cs-cta-inner {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.cs-cta-headline {
  font-family: var(--font-head);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: 16px;
}

.cs-cta-sub {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255,255,255,0.55);
  margin-bottom: 40px;
  font-weight: 300;
}

.cs-cta-btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  padding: 16px 32px;
  border-radius: 4px;
  text-decoration: none;
  transition: background 0.15s ease, transform 0.1s ease;
  box-shadow: 0 4px 16px rgba(255,59,47,0.3);
}

.cs-cta-btn:hover {
  background: #e03029;
  transform: translateY(-1px);
}

/* ===== FOOTER ===== */
.cs-footer {
  padding: 48px 80px;
  border-top: 1px solid rgba(255,255,255,0.1);
  background: var(--ink);
}

.cs-footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.cs-footer-logo {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: #fff;
  margin-bottom: 4px;
}

.cs-footer-tagline {
  font-size: 12px;
  color: rgba(255,255,255,0.4);
}

.cs-footer-links {
  display: flex;
  gap: 32px;
  font-size: 12px;
}

.cs-footer-link {
  color: rgba(255,255,255,0.4);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.cs-footer-link:hover { color: rgba(255,255,255,0.8); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .cs-nav, .cs-hero, .cs-section, .cs-cta, .cs-footer {
    padding-left: 40px;
    padding-right: 40px;
  }
  .cs-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .cs-nav, .cs-hero, .cs-section, .cs-cta, .cs-footer {
    padding-left: 24px;
    padding-right: 24px;
  }
  .cs-hero { padding-top: 72px; padding-bottom: 64px; }
  .cs-hero-headline { font-size: 30px; }
  .cs-metrics-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .cs-metric { padding: 20px 16px; }
  .cs-metric-num { font-size: 32px; }
  .cs-quote-text { padding-left: 20px; font-size: 18px; }
  .cs-footer-inner { flex-direction: column; align-items: flex-start; gap: 20px; }
  .cs-footer-links { flex-wrap: wrap; gap: 16px; }
  .cs-workflow-step { gap: 16px; }
}