/* ─────────────────────────────────────────────────────────────
   Case Study Shared Styles
   Inherits all brand tokens from /colors_and_type.css
───────────────────────────────────────────────────────────── */

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--rj-cream);
  color: var(--rj-ink);
  overflow-x: hidden;
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.65;
}

/* ──────────────── LAYOUT ──────────────── */
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.wrap-narrow { max-width: 720px; margin: 0 auto; padding: 0 32px; }
.wrap-prose { max-width: 680px; margin: 0 auto; padding: 0 32px; }

section { position: relative; padding: 80px 0; }
.section-ink { background: var(--rj-ink); color: var(--fg-inverse); }
.section-cream { background: var(--rj-cream); color: var(--rj-ink); }
.section-surface { background: var(--rj-surface); color: var(--rj-ink); }

/* Grain texture for ink sections */
.grain {
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.45 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='0.06'/></svg>");
  mix-blend-mode: overlay;
  opacity: 0.5;
  pointer-events: none;
  z-index: 1;
}
section > * { position: relative; z-index: 2; }

/* ──────────────── NAV ──────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 20px 32px;
  display: flex; align-items: center; justify-content: space-between;
  transition: all var(--dur-mid) var(--ease-editorial);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(242, 237, 232, 0.85);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid var(--border-subtle);
  padding: 14px 32px;
}
.nav-back {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--rj-ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color var(--dur-fast) var(--ease-editorial);
}
.nav-back:hover { color: var(--rj-amber); }
.nav-back .arrow { transition: transform var(--dur-fast); }
.nav-back:hover .arrow { transform: translateX(-4px); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  text-decoration: none;
  line-height: 1;
  transition: all var(--dur-fast) var(--ease-editorial);
  white-space: nowrap;
  cursor: pointer;
}
.btn-amber { background: var(--rj-amber); color: #fff; }
.btn-amber:hover { background: var(--rj-amber-hover); box-shadow: var(--shadow-amber); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--rj-ink); border-color: var(--rj-ink); }
.btn-ghost:hover { background: var(--rj-ink); color: var(--rj-cream); }
.btn-ghost-light { background: transparent; color: #fff; border-color: rgba(255,255,255,0.4); }
.btn-ghost-light:hover { background: #fff; color: var(--rj-ink); }

/* ──────────────── TYPOGRAPHY ──────────────── */
.eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--rj-amber);
}

.case-hero {
  padding: 180px 0 100px;
  position: relative;
  overflow: hidden;
}

.case-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 2rem + 5vw, 6.5rem);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: -0.035em;
  font-variation-settings: 'opsz' 144;
  color: var(--rj-ink);
  margin: 28px 0 32px;
  max-width: 1100px;
}
.case-hero h1 .accent { color: var(--rj-amber); font-style: italic; }

.case-deck {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: clamp(1.125rem, 0.9rem + 0.5vw, 1.4rem);
  line-height: 1.5;
  color: var(--rj-prose);
  max-width: 680px;
  margin: 0 0 56px;
}

/* Hero meta strip */
.hero-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 32px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}
.hero-meta-item { display: flex; flex-direction: column; gap: 4px; }
.hero-meta-item .k {
  font-size: 10px; font-weight: 600;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--rj-stone);
}
.hero-meta-item .v {
  font-family: var(--font-serif);
  font-size: 15px; font-weight: 500;
  color: var(--rj-ink);
  font-variation-settings: 'opsz' 48;
  line-height: 1.3;
}

/* Section heading (inside case) */
.section-head {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: 48px;
  margin-bottom: 48px;
  align-items: baseline;
}
.section-head .chapter {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--rj-stone);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.section-head h2 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 1.5rem + 1.75vw, 3rem);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.05;
  font-variation-settings: 'opsz' 96;
  color: inherit;
}
.section-ink .section-head h2 { color: #fff; }

/* Body prose */
.prose {
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1.7;
  color: var(--rj-prose);
  max-width: 680px;
}
.section-ink .prose { color: rgba(255,255,255,0.78); }
.prose p { margin-bottom: 24px; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--rj-ink); font-weight: 600; }
.section-ink .prose strong { color: #fff; }
.prose em {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05em;
  font-variation-settings: 'opsz' 48;
  color: var(--rj-ink);
}
.section-ink .prose em { color: #fff; }
.prose h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  font-variation-settings: 'opsz' 72;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--rj-ink);
  margin: 40px 0 16px;
}
.section-ink .prose h3 { color: #fff; }
.prose ul { margin: 16px 0 24px 0; padding-left: 24px; }
.prose ul li { margin-bottom: 10px; padding-left: 4px; }
.prose ul li::marker { color: var(--rj-amber); content: '·  '; font-weight: 600; }
.prose a { color: var(--rj-amber); border-bottom: 1px solid var(--rj-amber); padding-bottom: 1px; text-decoration: none; }
.prose a:hover { color: var(--rj-amber-hover); border-bottom-color: var(--rj-amber-hover); }

/* ──────────────── PULLQUOTE ──────────────── */
.pullquote {
  margin: 56px 0;
  max-width: 860px;
  border-left: 3px solid var(--rj-amber);
  padding-left: 32px;
}
.pullquote blockquote {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.5rem, 1.1rem + 1vw, 2.25rem);
  line-height: 1.3;
  color: var(--rj-ink);
  font-variation-settings: 'opsz' 72;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}
.section-ink .pullquote blockquote { color: #fff; }
.pullquote cite {
  font-family: var(--font-sans);
  font-style: normal;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--rj-stone);
}
.section-ink .pullquote cite { color: rgba(255,255,255,0.6); }

/* ──────────────── STAT GRID ──────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
  margin: 48px 0;
  padding: 32px 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}
.section-ink .stat-grid { border-color: rgba(255,255,255,0.12); }
.stat-grid .stat { display: flex; flex-direction: column; gap: 6px; }
.stat-grid .stat .n {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 1.5rem + 1.5vw, 3rem);
  font-weight: 600;
  line-height: 1;
  color: var(--rj-amber);
  font-variation-settings: 'opsz' 144;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.stat-grid .stat .k {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 500;
  color: var(--rj-stone);
  letter-spacing: 0.04em;
  line-height: 1.4;
}
.section-ink .stat-grid .stat .k { color: rgba(255,255,255,0.55); }

/* ──────────────── DATA CARD ──────────────── */
.data-card {
  background: #fff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px;
  margin: 40px 0;
  max-width: 720px;
}
.section-ink .data-card {
  background: rgba(255,255,255,0.03);
  border-color: rgba(255,255,255,0.1);
  color: #fff;
}
.data-card .title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 500;
  font-variation-settings: 'opsz' 48;
  letter-spacing: -0.01em;
  margin-bottom: 4px;
}
.data-card .meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--rj-stone);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}
.section-ink .data-card .meta { color: rgba(255,255,255,0.5); border-color: rgba(255,255,255,0.1); }

/* ──────────────── PROCESS TIMELINE ──────────────── */
.process-timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  counter-reset: step;
  margin: 32px 0 56px;
}
.process-step {
  position: relative;
  padding: 20px 20px 20px 48px;
  background: var(--rj-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  counter-increment: step;
}
.process-step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 18px;
  left: 16px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--rj-amber);
  font-weight: 600;
}
.process-step .label {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 500;
  font-variation-settings: 'opsz' 48;
  letter-spacing: -0.01em;
  color: var(--rj-ink);
  margin-bottom: 4px;
}
.process-step .desc {
  font-size: 13px;
  color: var(--rj-prose);
  line-height: 1.5;
}

/* ──────────────── NEXT CASE FOOTER ──────────────── */
.next-case {
  padding: 96px 0 48px;
  border-top: 1px solid var(--border-subtle);
}
.next-case-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: end;
}
.next-case-label {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--rj-amber);
  margin-bottom: 12px;
}
.next-case-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 1.3rem + 1.3vw, 2.5rem);
  font-weight: 400;
  font-variation-settings: 'opsz' 96;
  letter-spacing: -0.025em;
  line-height: 1.1;
  color: var(--rj-ink);
  text-decoration: none;
  display: inline-block;
  border-bottom: 0;
  transition: color var(--dur-fast) var(--ease-editorial);
}
.next-case-title:hover { color: var(--rj-amber); }
.next-case .back-home {
  justify-self: end;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  color: var(--rj-stone);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color var(--dur-fast) var(--ease-editorial);
}
.next-case .back-home:hover { color: var(--rj-amber); }

/* ──────────────── PAGE FOOTER ──────────────── */
footer.page-footer {
  padding: 32px 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--rj-stone);
  letter-spacing: 0.04em;
  border-top: 1px solid var(--border-subtle);
}

/* ──────────────── REVEALS ──────────────── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease-editorial), transform 0.7s var(--ease-editorial); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; }
.reveal.d4 { transition-delay: 0.32s; }

/* ──────────────── RESPONSIVE ──────────────── */
@media (max-width: 900px) {
  section { padding: 64px 0; }
  .case-hero { padding: 130px 0 70px; }
  .section-head { grid-template-columns: 1fr; gap: 16px; }
  .section-head .chapter { margin-bottom: -8px; }
  .hero-meta { gap: 24px; }
  .next-case-grid { grid-template-columns: 1fr; gap: 24px; }
  .next-case .back-home { justify-self: start; }
  .pullquote { padding-left: 20px; }
  .wrap { padding: 0 20px; }
  .nav, .nav.scrolled { padding: 14px 20px; }
}