/* Shared case study styles — extends Portfolio.html design system */
:root {
  --bg: #efeae0;
  --bg-2: #e4ddd0;
  --paper: #fff6ea;
  --fg: #15120f;
  --fg-dim: rgba(21,18,15,0.58);
  --fg-faint: rgba(21,18,15,0.14);
  --accent: #c14a1f;
  --accent-2: #1f4a3d;
  --accent-3: #d4a84b;
  --sage: #7a8c6e;
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-serif: 'Fraunces', Georgia, serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --edge: 2.5rem;
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
html, body { background: var(--bg); color: var(--fg); }
body {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: var(--bg); }

/* Paper grain */
body::after {
  content:'';
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.06;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px;
}

/* Back nav */
.back-nav {
  position: fixed;
  top: 1.25rem; left: 1.25rem;
  z-index: 500;
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.55rem 1rem 0.55rem 0.85rem;
  background: rgba(255,246,234,0.72);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: 0 8px 30px rgba(21,18,15,0.08), inset 0 0 0 1px rgba(21,18,15,0.10);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-dim);
  transition: color .3s, transform .3s;
}
.back-nav:hover { color: var(--fg); transform: translateX(-3px); }
.back-nav .arrow { transition: transform .3s; }
.back-nav:hover .arrow { transform: translateX(-3px); }

/* Hero */
.hero {
  padding: 8rem var(--edge) 4rem;
  max-width: 1200px;
  margin: 0 auto;
  border-bottom: 1px solid var(--fg-faint);
}
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 2rem;
}
.hero__eyebrow .dot {
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 999px;
  box-shadow: 0 0 8px rgba(193,74,31,0.55);
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.5rem, 7vw, 5.25rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
  margin-bottom: 2rem;
}
.hero__title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}
.hero__summary {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: clamp(1.1rem, 1.7vw, 1.45rem);
  line-height: 1.55;
  color: var(--fg-dim);
  max-width: 46rem;
  margin-bottom: 2.5rem;
}
.hero__summary em { color: var(--accent); font-style: italic; }

.hero__tags {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-bottom: 2.5rem;
}
.hero__tag {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--fg-faint);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-dim);
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--fg-faint);
}
.hero__meta-cell .k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 0.45rem;
}
.hero__meta-cell .v {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--fg);
  font-weight: 400;
}

/* Section scaffolding */
.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem var(--edge);
}
.section--narrow { max-width: 780px; }

.section__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}
.section__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 1.5rem;
}
.section__title em { font-family: var(--font-serif); font-style: italic; font-weight: 300; color: var(--accent); }

.prose p {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--fg-dim);
  margin-bottom: 1.15rem;
}
.prose p strong { color: var(--fg); font-weight: 500; font-family: var(--font-display); font-size: 1rem; }
.prose p em { color: var(--accent); font-style: italic; }
.prose ul { padding-left: 1.25rem; margin-bottom: 1.15rem; }
.prose li {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--fg-dim);
  margin-bottom: 0.4rem;
}

/* Context grid — 4 cards */
.context-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--fg-faint);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 3rem;
}
.context-card {
  background: var(--paper);
  padding: 1.75rem;
}
.context-card__label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.context-card__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.15rem;
  line-height: 1.15;
  margin-bottom: 0.65rem;
  letter-spacing: -0.01em;
}
.context-card__body {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--fg-dim);
}

/* KPI row */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--fg-faint);
  border-radius: 10px;
  overflow: hidden;
  margin: 2rem 0 3rem;
}
.kpi {
  background: var(--paper);
  padding: 1.5rem 1.25rem;
}
.kpi__value {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
  color: var(--accent);
  line-height: 1;
  letter-spacing: -0.02em;
}
.kpi__value em { font-family: var(--font-serif); font-style: italic; font-weight: 300; }
.kpi__label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-top: 0.6rem;
}
.kpi__sub {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--sage);
  margin-top: 0.25rem;
}

/* Callout */
.callout {
  background: rgba(193,74,31,0.06);
  border-left: 3px solid var(--accent);
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
  border-radius: 0 10px 10px 0;
}
.callout p {
  font-family: var(--font-serif);
  font-weight: 300;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--fg);
}
.callout strong { color: var(--accent); font-family: var(--font-display); font-weight: 500; }

.callout--sage {
  background: rgba(122,140,110,0.08);
  border-left-color: var(--sage);
}
.callout--sage strong { color: var(--sage); }

/* Code block (optional for analytic case studies) */
.code-block {
  background: #1a1714;
  border-radius: 10px;
  overflow: hidden;
  margin: 2rem 0;
  box-shadow: 0 10px 40px rgba(21,18,15,0.12);
}
.code-block__header {
  padding: 0.6rem 1.25rem;
  background: #2a2520;
  display: flex; justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,246,234,0.35);
}
.code-block__header .num { color: var(--accent); opacity: 0.7; }
.code-block pre {
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: #e6e1d8;
}
.code-block .kw { color: #c074a5; }
.code-block .fn { color: #d4a84b; }
.code-block .st { color: #9ab87a; }
.code-block .cm { color: #6b665f; font-style: italic; }
.code-block .num-lit { color: #e48d58; }

/* Divider */
.rule {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--edge);
}
.rule__line {
  height: 1px;
  background: var(--fg-faint);
}

/* Next / footer CTAs */
.footer-cta {
  padding: 6rem var(--edge);
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid var(--fg-faint);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.footer-cta__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.03em;
  line-height: 1;
}
.footer-cta__title em { font-family: var(--font-serif); font-style: italic; font-weight: 300; color: var(--accent); }
.footer-cta__actions {
  display: flex; flex-direction: column; gap: 1rem; align-items: flex-start;
}
.pill {
  display: inline-flex; align-items: center; gap: 0.75rem;
  padding: 0.9rem 1.25rem 0.9rem 1.5rem;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: transform .3s cubic-bezier(.2,.7,.2,1), background .3s;
}
.pill--dark { background: var(--fg); color: var(--paper); }
.pill--dark:hover { background: var(--accent); color: var(--paper); transform: translateX(6px); }
.pill--ghost { border: 1px solid var(--fg-faint); color: var(--fg); }
.pill--ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateX(6px); }
.pill .chev {
  width: 26px; height: 26px;
  border-radius: 999px;
  background: currentColor;
  color: var(--fg);
  display: grid; place-items: center;
  font-size: 0.85rem;
}
.pill--dark .chev { background: var(--paper); }
.pill--ghost .chev { background: var(--fg); color: var(--paper); }

footer.legal {
  padding: 2rem var(--edge);
  border-top: 1px solid var(--fg-faint);
  display: flex; justify-content: space-between;
  font-family: var(--font-mono); font-size: 0.6rem;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--fg-dim);
}
footer.legal a { border-bottom: 1px solid var(--fg-faint); }

/* Screenshot frame */
.shot {
  margin: 2.5rem 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--fg-faint);
  background: var(--paper);
}
.shot__frame {
  padding: 0.45rem 0.75rem;
  background: rgba(21,18,15,0.04);
  border-bottom: 1px solid var(--fg-faint);
  display: flex; gap: 0.35rem; align-items: center;
}
.shot__dot { width: 8px; height: 8px; border-radius: 999px; background: var(--fg-faint); }
.shot__dot:nth-child(1) { background: #e48d58; }
.shot__dot:nth-child(2) { background: #d4a84b; }
.shot__dot:nth-child(3) { background: #7a8c6e; }
.shot__body {
  min-height: 280px;
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--fg-dim);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 3rem 1.5rem;
  background: linear-gradient(135deg, rgba(21,18,15,0.02), rgba(21,18,15,0.05));
}

/* Tag pills for lists inline */
.tag-list {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  margin: 1.25rem 0;
}
.tag-list .tag {
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--fg-faint);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-dim);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 820px) {
  :root { --edge: 1.25rem; }
  .hero { padding: 6rem 1.25rem 3rem; }
  .hero__meta { grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
  .section { padding: 3.5rem 1.25rem; }
  .context-grid { grid-template-columns: 1fr; }
  .kpi-row { grid-template-columns: repeat(2, 1fr); }
  .footer-cta { grid-template-columns: 1fr; gap: 2rem; padding: 4rem 1.25rem; }
}