/* ══════════════════════════════════════════════════════════════════
   STOBOX — case-study-v3.css
   Per-page styles for /case-studies/<slug>.html detail pages.
   Loads AFTER /css/v3-system.css so it can override system tokens.
   ══════════════════════════════════════════════════════════════════ */

/* ── HERO (dark, atmospheric, shorter than homepage hero) ─────────── */
.csd-hero{
  position: relative;
  background: var(--bg-dark);
  color: var(--bg);
  overflow: hidden;
  padding: 110px var(--gutter) 90px;
  min-height: 60vh;
  display: flex;
  align-items: flex-end;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.csd-hero .sec-bg-img{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.30;
  mix-blend-mode: screen;
  pointer-events: none;
  z-index: 0;
  animation: bg-drift-b 26s ease-in-out infinite;
}
.csd-hero::before{
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 80% at 50% 50%, transparent 30%, rgba(10,14,44,0.55) 70%, var(--bg-dark) 100%);
  pointer-events: none;
  z-index: 1;
}
.csd-hero-inner{
  position: relative;
  z-index: 2;
  max-width: var(--maxw);
  margin: 0 auto;
  width: 100%;
}
.csd-crumb{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.55);
  margin-bottom: 28px;
}
.csd-crumb a{
  color: rgba(255,255,255,0.75);
  transition: color var(--t-fast);
}
.csd-crumb a:hover{ color: var(--accent-hi) }
.csd-crumb span{ margin: 0 8px; color: rgba(255,255,255,0.32) }
.csd-crumb [aria-current]{ color: var(--bg); margin: 0 }

.csd-eye{
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent-hi);
  margin-bottom: 22px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.csd-eye::before{
  content: '';
  width: 24px; height: 2px;
  background: var(--accent-hi);
}

.csd-hero h1{
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(40px, 5.5vw, 96px);
  line-height: 0.95;
  letter-spacing: -0.022em;
  color: var(--bg);
  text-transform: uppercase;
  margin: 0 0 22px;
  max-width: 22ch;
}
.csd-hero h1 em{ font-style: italic; color: var(--accent-hi); font-weight: 800 }

.csd-outcome{
  font-family: var(--body);
  font-weight: 400;
  font-size: clamp(15px, 1.15vw, 18px);
  line-height: 1.6;
  color: rgba(255,255,255,0.78);
  max-width: 64ch;
  margin: 0 0 38px;
}

/* ── HERO RIBBON — case-specific stat strip (tighter than homepage) ─ */
.csd-meta{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0;
  border-top: 1px solid rgba(255,255,255,0.10);
  border-bottom: 1px solid rgba(255,255,255,0.10);
  margin-top: 8px;
}
.csd-meta-item{
  padding: 22px 22px 22px 0;
  border-right: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.csd-meta-item:last-child{ border-right: 0 }
.csd-meta-lbl{
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
}
.csd-meta-val{
  font-family: var(--display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.012em;
  color: var(--bg);
  text-transform: uppercase;
}

/* ── BODY — two columns (article + sticky sidebar) ────────────────── */
.csd-body{
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 80px;
  align-items: start;
  max-width: 1200px;
  margin: 0 auto;
}
.csd-col-main{ min-width: 0 }
.csd-block{ margin-bottom: 56px }
.csd-block:last-child{ margin-bottom: 0 }
.csd-h2{
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(28px, 2.6vw, 40px);
  line-height: 1.05;
  letter-spacing: -0.018em;
  color: var(--ink);
  text-transform: uppercase;
  margin: 0 0 22px;
}
.csd-h2 em{ font-style: normal; color: var(--accent) }
.csd-block p{
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-2);
  margin: 0 0 16px;
}
.csd-block p strong{ color: var(--ink); font-weight: 600 }
.csd-list{
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}
.csd-list li{
  position: relative;
  padding: 14px 0 14px 28px;
  font-family: var(--body);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-2);
  border-bottom: 1px solid var(--rule);
}
.csd-list li:last-child{ border-bottom: 0 }
.csd-list li::before{
  content: '';
  position: absolute;
  left: 0;
  top: 22px;
  width: 16px;
  height: 2px;
  background: var(--accent);
}

/* ── SIDEBAR — sticky at-a-glance + CTA cards ─────────────────────── */
.csd-col-side{
  position: sticky;
  top: 80px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.csd-card{
  background: var(--bg);
  border: 1px solid var(--rule);
  padding: 28px 24px;
  border-radius: 1px;
  transition: background var(--t-base) var(--ease), border-color var(--t-base);
}
.csd-card:hover{ border-color: var(--rule-hard) }
.csd-card-label{
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.csd-card-label::before{
  content: '';
  width: 18px; height: 2px;
  background: var(--accent);
}
.csd-dl{ margin: 0 }
.csd-dl dt{
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 14px;
}
.csd-dl dt:first-of-type{ margin-top: 0 }
.csd-dl dd{
  margin: 4px 0 0;
  font-family: var(--body);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}

/* CTA card on dark surface */
.csd-card-cta{
  background: var(--bg-dark);
  border-color: var(--bg-dark);
  color: var(--bg);
}
.csd-card-cta .csd-card-label{ color: var(--accent-hi) }
.csd-card-cta .csd-card-label::before{ background: var(--accent-hi) }
.csd-card-cta p{
  font-family: var(--body);
  font-size: 14px;
  line-height: 1.55;
  color: rgba(255,255,255,0.78);
  margin: 0 0 18px;
}
.csd-card-cta p strong{ color: var(--bg); font-weight: 600 }
.csd-card-cta .btn-p{
  font-size: 13px;
  padding: 11px 18px;
}

/* ── ENGAGEMENT PILLARS — what we did (4-up card grid) ────────────── */
.csd-pillars{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin: 28px 0 0;
}
.csd-pillar{
  background: var(--bg);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background var(--t-base) var(--ease);
}
.sec.alt .csd-pillar{ background: var(--bg-2) }
.csd-pillar:hover, .sec.alt .csd-pillar:hover{ background: var(--blue-ice) }
.csd-pillar-num{
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--accent);
  text-transform: uppercase;
}
.csd-pillar-h{
  font-family: var(--display);
  font-weight: 700;
  font-size: 22px;
  text-transform: uppercase;
  letter-spacing: -0.014em;
  color: var(--ink);
  line-height: 1.05;
}
.csd-pillar-d{
  font-family: var(--body);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--ink-2);
}
@media (max-width: 760px){
  .csd-pillars{ grid-template-columns: 1fr }
}

/* ── RELATED CASES (3-up grid using ref-card pattern) ─────────────── */
.cs-rel-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 36px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.cs-rel-card{
  background: var(--bg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  transition: background var(--t-base) var(--ease),
              padding-left var(--t-fast) var(--ease),
              box-shadow .45s cubic-bezier(.22,1,.36,1);
}
.sec.alt .cs-rel-card{ background: var(--bg-2) }
.cs-rel-card:hover, .sec.alt .cs-rel-card:hover{
  background: var(--bg);
  padding-left: 30px;
  box-shadow: 0 18px 40px rgba(10,14,44,0.10);
}
.cs-rel-top{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}
.cs-rel-card h4{
  font-family: var(--display);
  font-weight: 800;
  font-size: 24px;
  text-transform: uppercase;
  letter-spacing: -0.018em;
  line-height: 1;
  color: var(--ink);
  margin: 0;
}
.cs-rel-card .cs-card-country{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--ink-3);
  text-transform: uppercase;
}
.cs-rel-card .cs-card-outcome{
  font-family: var(--body);
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink-2);
}

/* ── RESPONSIVE ─────────────────────────────────────────────────── */
@media (max-width: 960px){
  .csd-hero{ padding: 80px var(--gutter) 60px; min-height: auto }
  .csd-body{ grid-template-columns: 1fr; gap: 50px }
  .csd-col-side{ position: static }
  .cs-rel-grid{ grid-template-columns: 1fr 1fr }
}
@media (max-width: 600px){
  .csd-hero{ padding: 60px var(--gutter) 48px }
  .csd-meta{ grid-template-columns: 1fr 1fr }
  .csd-meta-item{ padding: 18px 14px 18px 0 }
  .cs-rel-grid{ grid-template-columns: 1fr }
}