/* ─────────────────────────────────────────────────────────────
   Case study pages — shared stylesheet
   Inherits tokens + site.css; loaded after them.
───────────────────────────────────────────────────────────── */

/* ── Layout shell ── */
.cs-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 80px 40px 120px;
}

/* ── Hero ── */
.cs-hero {
  position: relative;
  width: 100%;
  min-height: 520px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 80px 40px 56px;
  background: var(--paper);
  overflow: hidden;
  margin-bottom: 72px;
}
.cs-hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}
.cs-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(6,4,14,0.82) 0%, rgba(6,4,14,0.35) 60%, rgba(6,4,14,0.1) 100%);
  z-index: 1;
}
.cs-hero__content {
  position: relative;
  z-index: 2;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
}
.cs-hero__eyebrow {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--rosewood-2);
  margin: 0 0 16px;
}
.cs-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(32px, 5vw, 58px);
  font-weight: 400;
  line-height: 1.1;
  color: #fff;
  margin: 0 0 32px;
}
.cs-hero__title em {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-weight: 400;
}
.cs-hero__meta {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.cs-hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.cs-hero__meta-item dt {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
}
.cs-hero__meta-item dd {
  font-family: var(--font-heading);
  font-size: 15px;
  color: #fff;
}

/* ── Section anatomy ── */
.cs-section {
  margin-bottom: 80px;
}
.cs-section + .cs-section {
  padding-top: 64px;
  border-top: 1px solid var(--line-soft);
}

.cs-label {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--rosewood-2);
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.cs-label::before {
  content: '';
  display: inline-block;
  width: 18px;
  height: 1px;
  background: var(--rosewood-2);
}

.cs-section-title {
  font-family: var(--font-heading);
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 400;
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 24px;
}

.cs-body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink-3);
  margin: 0 0 24px;
}
.cs-body strong { color: var(--ink); font-weight: 600; }
.cs-body + .cs-body { margin-top: 0; }

/* ── Meta grid (overview row) ── */
.cs-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0;
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  overflow: hidden;
  margin: 32px 0;
}
.cs-meta-grid__cell {
  padding: 24px 28px;
  border-right: 1px solid var(--line-soft);
}
.cs-meta-grid__cell:last-child { border-right: none; }
.cs-meta-grid__cell dt {
  text-align: left;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}
.cs-meta-grid__cell dd {
  font-family: var(--font-heading);
  font-size: 16px;
  color: var(--ink);
  line-height: 1.3;
  text-align: left;
  margin: 0;
  padding: 0;
}

/* ── Pull quote ── */
.cs-pullquote {
  margin: 48px 0;
  padding: 36px 40px;
  background: var(--paper);
  border-left: 3px solid var(--rosewood-2);
  border-radius: 0 12px 12px 0;
}
.cs-pullquote__label {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rosewood-2);
  margin-bottom: 12px;
}
.cs-pullquote__text {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: clamp(20px, 2.5vw, 26px);
  line-height: 1.4;
  color: var(--ink);
  margin: 0;
}

/* ── Image ── */
.cs-img-wrap {
  margin: 40px 0;
  border-radius: 12px;
  overflow: hidden;
  background: var(--paper);
}
.cs-img-wrap img,
.cs-img-wrap svg {
  width: 100%;
  display: block;
}
.cs-img-placeholder {
  width: 100%;
  background: var(--paper);
  border: 1.5px dashed var(--line);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 64px 40px;
  box-sizing: border-box;
  color: var(--muted-2);
  font-family: var(--font-sans);
  font-size: 13px;
}
.cs-img-placeholder svg { opacity: 0.35; }
.cs-caption {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--muted);
  margin-top: 12px;
  line-height: 1.5;
}

/* ── Two-up images ── */
.cs-img-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 40px 0;
}

/* ── Insight cards ── */
.cs-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin: 32px 0;
}
.cs-card {
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  padding: 24px 24px 28px;
}
.cs-card__num {
  font-family: var(--font-heading);
  font-size: 13px;
  color: var(--rosewood-2);
  margin-bottom: 10px;
}
.cs-card__title {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-bottom: 8px;
}
.cs-card__body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-3);
}

/* ── Metrics ── */
.cs-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  overflow: hidden;
  margin: 40px 0;
}
.cs-metric {
  background: var(--bg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.cs-metric__value {
  font-family: var(--font-heading);
  font-size: 42px;
  font-weight: 400;
  color: var(--rosewood-2);
  line-height: 1;
}
.cs-metric__label {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── Learnings ── */
.cs-learnings {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin: 32px 0;
}
.cs-learning {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.cs-learning__icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.cs-learning__text { flex: 1; }
.cs-learning__title {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 4px;
}
.cs-learning__body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-3);
  margin: 0;
}

/* ── Case nav (prev/next) ── */
.cs-nav {
  margin-top: 100px;
  border-top: 1px solid var(--line-soft);
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.cs-nav__item {
  padding: 40px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  transition: opacity .18s ease;
}
.cs-nav__item:first-child { border-right: 1px solid var(--line-soft); padding-right: 40px; }
.cs-nav__item:last-child  { padding-left: 40px; align-items: flex-end; text-align: right; }
.cs-nav__item:hover { opacity: 0.7; }
.cs-nav__dir {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.cs-nav__title {
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--ink);
  line-height: 1.25;
}
.cs-nav__sub {
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--muted);
}

/* ── Back link ── */
.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color .15s ease;
  padding: 20px 0 0;
}
.cs-back:hover { color: var(--rosewood-2); }

/* ── Light theme overrides ── */
[data-theme="light"] .cs-meta-grid { border-color: #DAD6CD; }
[data-theme="light"] .cs-meta-grid__cell { border-color: #DAD6CD; }
[data-theme="light"] .cs-pullquote { background: #F0EDE6; }
[data-theme="light"] .cs-card { background: #F0EDE6; border-color: #DAD6CD; }
[data-theme="light"] .cs-metric { background: #F7F5F2; }
[data-theme="light"] .cs-metrics { background: #DAD6CD; border-color: #DAD6CD; }
[data-theme="light"] .cs-img-placeholder { background: #ECEAE4; border-color: #CAC6BE; }
[data-theme="light"] .cs-learning__icon { background: #ECEAE4; border-color: #DAD6CD; }
[data-theme="light"] .cs-nav { border-color: #DAD6CD; }
[data-theme="light"] .cs-nav__item:first-child { border-color: #DAD6CD; }
[data-theme="light"] .cs-section + .cs-section { border-color: #DAD6CD; }

/* ── Responsive ── */
@media (max-width: 720px) {
  .cs-page { padding: 0 20px 80px; }
  .cs-hero { padding: 60px 20px 40px; min-height: 400px; }
  .cs-hero__meta { gap: 20px; }
  .cs-img-row { grid-template-columns: 1fr; }
  .cs-meta-grid { grid-template-columns: 1fr 1fr; }
  .cs-meta-grid__cell:nth-child(odd) { border-right: 1px solid var(--line-soft); }
  .cs-meta-grid__cell:nth-child(even) { border-right: none; }
  .cs-nav { grid-template-columns: 1fr; }
  .cs-nav__item:first-child { border-right: none; border-bottom: 1px solid var(--line-soft); padding-right: 0; padding-bottom: 32px; }
  .cs-nav__item:last-child { padding-left: 0; align-items: flex-start; text-align: left; }
}