/* ============================================================================
   IGW-NET Case Studies — Shared Stylesheet
   Served at: /magnet/docs/igwnet/case-studies/assets/case-study.css
   Visual identity: dark navy hero, forest-green accent (distinct from teal
   tutorials, amber concepts, amber-gold manual)
   ============================================================================ */

:root {
  --bg: #ffffff;
  --bg2: #f5f7fa;
  --bg-tint: #f0f7f0;
  --t1: #1a2332;
  --t2: #3d4f63;
  --t3: #7a8a9d;
  --accent: #2d6a4f;
  --accent2: #1b4332;
  --accent-light: #52b788;
  --accent-glow: rgba(45, 106, 79, 0.12);
  --se: 'Georgia', serif;
  --bdr: #e2e8f0;
  --bdr-soft: #edf0f4;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: #e8ecf0;
  color: var(--t2);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

.page-wrap {
  max-width: 900px;
  margin: 0 auto;
  background: var(--bg);
  box-shadow: 0 0 40px rgba(0,0,0,0.12);
}

.nav {
  background: var(--t1);
  border-bottom: 1px solid var(--bdr);
  padding: 12px 36px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav .brand {
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  font-size: 15px;
  letter-spacing: 0.3px;
}
.nav .breadcrumb { font-size: 13px; color: #a8bdd0; }
.nav .breadcrumb a { color: var(--accent-light); text-decoration: none; }
.nav .breadcrumb a:hover { text-decoration: underline; }

.hero {
  background: var(--t1);
  padding: 44px 36px 36px;
  text-align: center;
  border-bottom: 1px solid var(--bdr);
  position: relative;
}
.hero .eyebrow {
  color: var(--accent-light);
  font-size: 12px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  margin-bottom: 12px;
  font-weight: 600;
}
.hero h1 {
  font-family: var(--se);
  font-size: clamp(26px, 3.6vw, 36px);
  font-weight: 400;
  color: #fff;
  margin-bottom: 14px;
  line-height: 1.25;
}
.hero h1 em { font-style: italic; color: var(--accent-light); }
.hero .subtitle {
  font-size: 16px;
  color: #a8bdd0;
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.65;
  font-style: italic;
}
.hero .site-meta {
  margin-top: 16px;
  font-size: 13px;
  color: #7a8ea1;
  letter-spacing: 0.3px;
}
.hero .site-meta strong { color: #fff; font-weight: 600; }

.meta-badges {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.meta-badges .badge {
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(82, 183, 136, 0.14);
  color: var(--accent-light);
  border: 1px solid rgba(82, 183, 136, 0.35);
  letter-spacing: 0.3px;
}

.content {
  padding: 36px;
  max-width: 900px;
  margin: 0 auto;
}

/* Abstract / key findings */
.abstract {
  background: var(--bg-tint);
  border: 2px solid var(--accent);
  border-radius: 12px;
  padding: 22px 28px;
  margin: 0 0 32px;
}
.abstract .label {
  color: var(--accent);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.abstract p {
  color: var(--t1);
  font-size: 17px;
  line-height: 1.6;
}
.abstract p + p { margin-top: 10px; }
.abstract strong { color: var(--accent2); }

/* Section headers */
h2 {
  font-family: var(--se);
  font-size: 26px;
  font-weight: 400;
  color: var(--t1);
  margin: 40px 0 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent);
}
h2 em { font-style: italic; color: var(--accent); }
h2:first-of-type { margin-top: 0; }

h3 {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--t1);
  margin: 24px 0 10px;
}
h4 {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: var(--t2);
  margin: 16px 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.content p {
  color: var(--t2);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 14px;
}
.content p strong { color: var(--t1); }
.content ul, .content ol { margin: 10px 0 16px 24px; }
.content li {
  color: var(--t2);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 5px;
}

code {
  background: var(--bg2);
  border: 1px solid var(--bdr-soft);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  font-size: 13px;
  color: var(--accent2);
}

/* Figures */
figure {
  margin: 22px 0;
  padding: 10px;
  background: var(--bg2);
  border: 1px solid var(--bdr);
  border-radius: 10px;
  text-align: center;
}
figure img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  display: block;
  margin: 0 auto;
}
figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--t3);
  font-style: italic;
  line-height: 1.55;
  padding: 0 12px;
}
figcaption .fig-num {
  font-style: normal;
  font-weight: 700;
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-right: 6px;
}

/* Step blocks (for procedural portions) */
.step {
  margin: 16px 0;
  padding: 16px 20px 16px 22px;
  background: var(--bg2);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
}
.step .step-num {
  font-weight: 700;
  font-size: 13px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 6px;
}

/* Note / implication callouts */
.callout {
  background: #fef3c7;
  border-left: 3px solid #f59e0b;
  padding: 14px 18px;
  margin: 18px 0;
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  color: var(--t2);
}
.callout.finding {
  background: #d1fae5;
  border-left-color: var(--accent);
}
.callout strong { color: var(--t1); }

/* Cross-pillar refs block */
.cross-pillar-refs {
  margin: 36px 0 24px;
  padding: 20px 26px;
  background: linear-gradient(135deg, #f5f9fc 0%, #f0f7f0 100%);
  border: 1px solid #d8e2ec;
  border-left: 4px solid var(--accent);
  border-radius: 0 10px 10px 0;
}
.cross-pillar-refs h4 {
  color: var(--accent2);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin: 0 0 14px;
}
.cross-pillar-refs .crossref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}
.cross-pillar-refs .crossref-col h5 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--t3);
  margin: 0 0 8px;
  font-weight: 700;
}
.cross-pillar-refs .crossref-col ul { list-style: none; padding: 0; margin: 0; }
.cross-pillar-refs .crossref-col li {
  padding: 3px 0;
  font-size: 13px;
  line-height: 1.5;
}
.cross-pillar-refs a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dotted transparent;
}
.cross-pillar-refs a:hover {
  border-bottom-color: var(--accent);
}

/* Source provenance footer */
.source-trace {
  margin: 36px 0 12px;
  padding: 18px 22px;
  background: var(--bg2);
  border: 1px dashed var(--bdr);
  border-radius: 10px;
  font-size: 13px;
}
.source-trace h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--t3);
  margin: 0 0 10px;
  font-weight: 700;
}
.source-trace dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 14px;
  font-size: 13px;
}
.source-trace dt { color: var(--t3); font-weight: 600; }
.source-trace dd { color: var(--t2); }

.footer {
  background: var(--t1);
  border-top: 1px solid var(--bdr);
  padding: 20px 36px;
  text-align: center;
  font-size: 13px;
  color: #a8bdd0;
}
.footer a { color: var(--accent-light); text-decoration: none; }

/* Index page grid */
.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  margin: 30px 0;
}
.case-card {
  padding: 24px 26px;
  background: var(--bg);
  border: 1px solid var(--bdr);
  border-radius: 12px;
  text-decoration: none;
  color: var(--t2);
  transition: all 0.15s;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.case-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--accent-glow);
}
.case-card .eyebrow {
  font-size: 11px;
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.case-card h3 {
  font-family: var(--se);
  font-size: 20px;
  color: var(--t1);
  margin: 0;
  font-weight: 500;
  line-height: 1.3;
}
.case-card .site {
  font-size: 13px;
  color: var(--t3);
  font-style: italic;
}
.case-card .summary {
  font-size: 14px;
  color: var(--t2);
  line-height: 1.55;
}
.case-card .features {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}
.case-card .feature-tag {
  font-size: 11px;
  padding: 3px 8px;
  background: var(--bg-tint);
  color: var(--accent2);
  border-radius: 999px;
  border: 1px solid var(--accent-glow);
}

@media print {
  .nav, .footer { display: none; }
  body { background: #fff; }
  .page-wrap { box-shadow: none; max-width: none; }
}