/* ── CASE STUDY PAGE STYLES ── */
/* Supplements ../style.css (nav, footer, base reset) */

:root {
  --teal: #0d9488;
  --teal-bg: rgba(13,148,136,0.09);
  --teal-border: rgba(13,148,136,0.25);
}

/* Fixed nav clearance */
body { padding-top: 72px; }

/* ── TOPBAR / BACK LINK ── */
.cs-topbar {
  background: var(--cream);
  border-bottom: 1px solid var(--rule);
  padding: 0.7rem 2.5rem;
}
.cs-topbar-inner {
  max-width: 900px;
  margin: 0 auto;
}
.cs-back {
  font-family: 'DM Mono', monospace;
  font-size: 0.67rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: color 0.2s;
}
.cs-back:hover { color: var(--ink); }

/* ── HERO IMAGE ── */
.cs-hero-img-wrap {
  background: var(--cream);
  padding: 2rem 2.5rem 0;
  text-align: center;
}
.cs-hero-img {
  display: block;
  width: 100%;
  max-width: 700px;
  height: auto;
  margin: 0 auto;
  border-radius: 8px;
}

/* ── HERO CONTENT ── */
.cs-hero {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 2.5rem 2.5rem;
  border-bottom: 1px solid var(--rule);
}
.cs-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
  align-items: center;
}
.cs-meta-badge {
  font-family: 'DM Mono', monospace;
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.28rem 0.7rem;
  border: 1px solid var(--rule);
  color: var(--muted);
  border-radius: 2px;
}
.cs-meta-badge--teal {
  background: var(--teal-bg);
  color: var(--teal);
  border-color: var(--teal-border);
}
.cs-meta-badge--status {
  background: var(--teal);
  color: #fff;
  border-color: var(--teal);
}
.cs-h1 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin-bottom: 1.5rem;
}
.cs-overview {
  font-size: 1rem;
  line-height: 1.82;
  color: #3a3630;
  max-width: 760px;
  margin-bottom: 2.5rem;
}
.cs-overview p + p { margin-top: 1rem; }

/* Impact metrics strip */
.cs-impact-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--rule);
  background: var(--cream);
}
.cs-impact-stat {
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  border-right: 1px solid var(--rule);
}
.cs-impact-stat:last-child { border-right: none; }
.cs-impact-val {
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.cs-impact-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── TAB NAV ── */
.cs-tab-nav {
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
  padding: 0 2.5rem;
  position: sticky;
  top: 72px;
  z-index: 40;
  overflow-x: auto;
}
.cs-tab-nav-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  gap: 0;
}
.cs-tab {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  padding: 1rem 1.25rem;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.2s, border-color 0.2s;
  display: inline-block;
}
.cs-tab:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ── CONTENT WRAPPER ── */
.cs-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2.5rem 6rem;
}

/* ── SECTIONS ── */
.cs-section {
  padding-top: 4rem;
  border-top: 1px solid var(--rule);
  margin-top: 4rem;
}
.cs-section:first-child {
  margin-top: 0;
  border-top: none;
}
.cs-section-eyebrow {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.cs-section-eyebrow::before {
  content: '';
  display: block;
  width: 1.5rem;
  height: 1px;
  background: var(--teal);
}
.cs-section-title {
  font-family: 'Playfair Display', serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 1.5rem;
}
.cs-body {
  font-size: 1rem;
  line-height: 1.82;
  color: #3a3630;
}
.cs-body p + p { margin-top: 1rem; }
.cs-body ul {
  margin-top: 1rem;
  padding-left: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.cs-body ul li {
  padding: 0.35rem 0 0.35rem 1.5rem;
  position: relative;
  color: #3a3630;
  font-size: 1rem;
  line-height: 1.7;
}
.cs-body ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--teal);
  font-size: 0.85rem;
}

/* ── CALLOUT BOXES (pain point stats) ── */
.cs-callouts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}
.cs-callout {
  background: var(--cream);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--teal);
  padding: 1.5rem 1.25rem;
}
.cs-callout-val {
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: -0.02em;
  margin-bottom: 0.35rem;
  line-height: 1.2;
}
.cs-callout-desc {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ── TECH TAGS ── */
.cs-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.5rem;
}
.cs-tag {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.65rem;
  background: var(--teal-bg);
  color: var(--teal);
  border-radius: 2px;
}

/* ── ARCHITECTURE LAYERS ── */
.cs-arch-layers {
  margin-top: 1.5rem;
  border: 1px solid var(--rule);
  overflow: hidden;
}
.cs-arch-layer {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid var(--rule);
}
.cs-arch-layer:last-child { border-bottom: none; }
.cs-arch-layer:nth-child(odd) { background: var(--cream); }
.cs-arch-layer-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--teal);
  flex-shrink: 0;
  min-width: 100px;
  padding-top: 0.15rem;
}
.cs-arch-layer-desc {
  font-size: 0.9rem;
  color: #3a3630;
  line-height: 1.65;
}

/* ── IMPACT METRICS GRID ── */
.cs-metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.cs-metric-box {
  background: var(--cream);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--teal);
  padding: 1.75rem 1.5rem;
}
.cs-metric-box-val {
  font-family: 'Playfair Display', serif;
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--teal);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.5rem;
}
.cs-metric-box-label {
  font-family: 'DM Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.cs-metric-box-desc {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ── TAKEAWAY CARDS ── */
.cs-takeaways {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1.5rem;
}
.cs-takeaway {
  background: var(--cream);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--teal);
  padding: 1.5rem 1.75rem;
}
.cs-takeaway-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 0.4rem;
}
.cs-takeaway-body {
  font-size: 0.9rem;
  color: #3a3630;
  line-height: 1.75;
}

/* ── CTA SECTION ── */
.cs-cta-section {
  margin-top: 4rem;
  padding: 2.5rem;
  background: var(--cream);
  border: 1px solid var(--rule);
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: space-between;
}
.cs-cta-text h3 {
  font-family: 'Playfair Display', serif;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}
.cs-cta-text p {
  font-size: 0.88rem;
  color: var(--muted);
}
.cs-cta-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  body { padding-top: 72px; }
  .cs-topbar { padding: 0.7rem 1.5rem; }
  .cs-hero-img-wrap { height: 280px; }
  .cs-hero { padding: 2rem 1.5rem; }
  .cs-impact-row { grid-template-columns: repeat(2, 1fr); }
  .cs-impact-stat:nth-child(2n) { border-right: none; }
  .cs-impact-stat:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .cs-tab-nav { padding: 0 1rem; }
  .cs-content { padding: 0 1.5rem 4rem; }
  .cs-callouts { grid-template-columns: 1fr; }
  .cs-metrics-grid { grid-template-columns: 1fr; }
  .cs-cta-section { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .cs-impact-row { grid-template-columns: 1fr 1fr; }
  .cs-h1 { font-size: 2.2rem; }
}

/* ── CTA BUTTON OVERRIDES ── */
.cs-cta-buttons .btn-secondary {
  background: #e8722a;
  color: #ffffff;
  padding: 0.875rem 2rem;
  border-bottom: none;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: background 0.2s;
}
.cs-cta-buttons .btn-secondary:hover {
  background: #c85a22;
  color: #ffffff;
  border-color: transparent;
}