/* ── Case Study Pages ────────────────────────────── */

/* ── Header ──────────────────────────────────────── */
.case-header {
  background: var(--color-hero-bg);
  padding: 120px 0 72px;
  position: relative;
  overflow: hidden;
}

/* Faint dot-grid echo on case pages */
.case-header::after {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 50%; height: 100%;
  background-image: radial-gradient(circle, rgba(255,255,255,0.055) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  mask-image: linear-gradient(to left, rgba(0,0,0,0.55) 0%, transparent 100%);
  -webkit-mask-image: linear-gradient(to left, rgba(0,0,0,0.55) 0%, transparent 100%);
}

.case-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,0.45);
  text-decoration: none;
  letter-spacing: 0.01em;
  margin-bottom: 32px;
  transition: color var(--transition);
  position: relative;
  z-index: 1;
}

.case-back:hover { color: rgba(255,255,255,0.80); }

.case-header-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}

.case-company {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.case-divider {
  width: 4px;
  height: 4px;
  background: rgba(255,255,255,0.25);
  display: inline-block;
}

.case-year {
  font-size: 12px;
  font-weight: 500;
  color: rgba(255,255,255,0.40);
  letter-spacing: 0.04em;
}

.case-title {
  font-size: clamp(30px, 4.5vw, 54px);
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.04em;
  line-height: 1.08;
  margin-bottom: 20px;
  max-width: none;
  position: relative;
  z-index: 1;
}

.case-subtitle {
  font-size: clamp(15px, 1.6vw, 17px);
  color: rgba(255,255,255,0.65);
  line-height: 1.75;
  max-width: 640px;
  margin-bottom: 52px;
  font-weight: 400;
  letter-spacing: 0.008em;
  position: relative;
  z-index: 1;
}

/* ── Stats bar ───────────────────────────────────── */
.case-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.10);
  overflow: hidden;
  position: relative;
  z-index: 1;
}

.case-stat {
  background: rgba(255,255,255,0.04);
  padding: 22px 20px;
}

.case-stat-value {
  font-size: 24px;
  font-weight: 800;
  color: #FFFFFF;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 6px;
}

.case-stat-label {
  font-size: 11px;
  font-weight: 500;
  color: rgba(255,255,255,0.50);
  letter-spacing: 0.02em;
  line-height: 1.4;
}

/* ── Body layout ─────────────────────────────────── */
.case-body {
  background: var(--color-bg);
  padding: 80px 0 0;
}

.case-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 80px;
  align-items: start;
}

/* ── Sidebar ─────────────────────────────────────── */
.case-sidebar {
  position: sticky;
  top: 88px;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 2px solid var(--color-ink);
  padding-top: 24px;
}

.case-sidebar-block {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}

.case-sidebar-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin-bottom: 5px;
}

.case-sidebar-value {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink-secondary);
  line-height: 1.45;
}

/* ── Main content ────────────────────────────────── */
.case-main {
  padding-bottom: 96px;
}

.case-section {
  margin-bottom: 72px;
  padding-bottom: 72px;
  border-bottom: 1px solid var(--color-border);
}

.case-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.case-section .section-pill {
  margin-bottom: 16px;
}

.case-section-title {
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 800;
  color: var(--color-ink);
  letter-spacing: -0.035em;
  line-height: 1.18;
  margin-bottom: 24px;
  max-width: none;
}

.case-main p {
  font-size: 16px;
  line-height: 1.82;
  color: var(--color-ink-secondary);
  margin-bottom: 18px;
  max-width: none;
}

.case-main p:last-child { margin-bottom: 0; }

/* ── Callout grid ────────────────────────────────── */
.case-callout-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--color-border-strong);
  margin-top: 32px;
}

.case-callout {
  background: #FFFFFF;
  padding: 32px 28px;
}

.case-callout-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.10em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.case-callout h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.02em;
  line-height: 1.32;
  margin-bottom: 12px;
}

.case-callout p {
  font-size: 14px;
  color: var(--color-ink-secondary);
  line-height: 1.75;
  margin-bottom: 0;
}

/* ── Framework rows ──────────────────────────────── */
.case-framework {
  margin-top: 32px;
  border-top: 2px solid var(--color-ink);
}

.case-framework-row {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 28px;
  align-items: start;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.case-framework-letter {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: -0.04em;
  line-height: 1;
  padding-top: 4px;
}

.case-framework-content h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.case-framework-content p {
  font-size: 14px;
  color: var(--color-ink-secondary);
  line-height: 1.75;
  margin-bottom: 0;
}

/* ── Results grid ────────────────────────────────── */
.case-results-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  background: var(--color-border-strong);
  margin-top: 32px;
}

.case-result {
  background: var(--color-bg-alt);
  padding: 32px 28px;
}

.case-result-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--color-ink);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 4px;
}

.case-result-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.case-result p {
  font-size: 13px;
  color: var(--color-ink-secondary);
  line-height: 1.65;
  margin-bottom: 0;
}

/* ── Next case ───────────────────────────────────── */
.case-next {
  background: var(--color-bg-alt);
  padding: 64px 0;
  border-top: 1px solid var(--color-border);
}

.case-next-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin-bottom: 16px;
}

.case-next-link {
  display: block;
  text-decoration: none;
  max-width: 680px;
  padding: 32px;
  border: 1.5px solid var(--color-border-strong);
  background: #FFFFFF;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.case-next-link:hover {
  box-shadow: 0 6px 28px rgba(5,13,31,0.10);
  border-color: var(--color-accent-border);
}

.case-next-company {
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.case-next-title {
  font-size: clamp(18px, 2.2vw, 24px);
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.03em;
  line-height: 1.28;
  margin-bottom: 18px;
}

.case-next-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.01em;
}

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 900px) {
  .case-stats { grid-template-columns: repeat(2, 1fr); }

  .case-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .case-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0 24px;
    border-top: 2px solid var(--color-ink);
  }

  .case-callout-grid { grid-template-columns: 1fr; }
  .case-results-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .case-header { padding: 100px 0 56px; }
  .case-stats { grid-template-columns: 1fr 1fr; }
  .case-sidebar { grid-template-columns: 1fr; }
  .case-framework-row { grid-template-columns: 36px 1fr; gap: 16px; }
}