.nav-links a:hover { color: var(--ink); }

/* ─── Case study hero ─── */
.cs-hero { padding: 80px 0 64px; }

.cs-meta-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 24px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 56px;
}

.cs-meta-key {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}

.cs-meta-val {
  font-size: 14px;
  color: var(--ink);
}

.cs-title {
  margin: 0 0 32px;
  font-family: var(--font-display);
  font-size: clamp(1.875rem, 3.5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--muted);
}

.cs-title .strong { color: var(--ink); }

.cs-cover { margin: 0 0 56px; }

.cs-cover img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 16px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
}

.cs-notice {
  margin: 0;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
}

.cs-notice-head {
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--ink);
}

.cs-notice-head .ph {
  color: #f5c518;
  font-size: 28px;
  line-height: 1;
  flex-shrink: 0;
}

.cs-notice-body {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--muted);
}

/* ─── Body sections ─── */
.cs-section {
  padding: 56px 0;
  border-top: 1px solid var(--rule-soft);
}

.cs-section h2 {
  margin: 0 0 32px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--ink);
}

.cs-split {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) 3fr;
  gap: 48px;
  align-items: start;
}

.cs-split h2 { margin: 0; }

.cs-body p {
  margin: 0 0 20px;
  font-size: 1.25rem;
  line-height: 1.55;
  color: var(--text);
}

.cs-body p:last-child { margin-bottom: 0; }

.cs-body strong {
  color: var(--ink);
  font-weight: 600;
}

/* ─── Highlights ─── */
.highlights {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  counter-reset: highlight;
}

.highlights li {
  display: block;
  padding: 28px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 16px;
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--text);
  transition: border-color 240ms ease, background 240ms ease, transform 240ms ease;
}

.highlights li:hover {
  border-color: var(--muted-2);
  background: var(--bg-elev);
  transform: translateY(-2px);
}

.highlights li::before {
  content: counter(highlight, decimal-leading-zero);
  counter-increment: highlight;
  display: block;
  margin-bottom: 18px;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
  line-height: 1;
}

.highlights strong {
  color: var(--ink);
  font-weight: 600;
}

/* ─── Page footer / next ─── */
.cs-footer {
  padding: 96px 0 64px;
  border-top: 1px solid var(--rule);
}

.cs-footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.cs-footer-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border: 1px solid var(--rule);
  color: var(--ink);
  font-size: 16px;
  font-weight: 500;
  border-radius: 999px;
  transition: all 180ms ease;
}

.cs-footer-link:hover {
  border-color: var(--ink);
  background: var(--bg-soft);
}

.cs-footer-link.primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

.cs-footer-link.primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--rule);
  font-size: 14px;
  color: var(--muted);
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  align-items: center;
}

.footer-links { display: flex; gap: 24px; }

/* ─── Responsive ─── */
@media (max-width: 760px) {
  .cs-hero { padding: 56px 0 48px; }

  .cs-section { padding: 48px 0; }

  .cs-footer { padding: 64px 0 48px; }

  .cs-meta-strip {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 40px;
  }

  .cs-split { grid-template-columns: 1fr; gap: 20px; }

  .cs-cover { margin: 0 0 32px; }

  .cs-cover img { border-radius: 12px; }

  .cs-footer-grid { flex-direction: column; align-items: flex-start; }

  .highlights { grid-template-columns: 1fr; }

  .highlights li { padding: 22px; }

  .highlights li::before { font-size: 24px; margin-bottom: 14px; }

}