/* ============================================================
   7modes — Case study layout (Moonbow)
   Dark navy hero + meta band, then a paper content body.
   Link AFTER styles.css:
     <link rel="stylesheet" href="../css/moonbow/styles.css">
     <link rel="stylesheet" href="../css/moonbow/case-study.css">
   ============================================================ */

/* ── Dark hero ── */
.cs-hero {
  min-height: 78vh;
  display: grid; grid-template-columns: 1fr 1fr;
  position: relative; overflow: hidden;
  background: var(--navy);
  padding: 136px 0 0;
}
.cs-hero-left {
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 60px 60px 72px; position: relative; z-index: 2;
}
.cs-back {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--d-dim); text-decoration: none;
  margin-bottom: 40px; transition: color 0.2s, gap 0.2s;
}
.cs-back:hover { color: var(--moonbow); gap: 14px; }
.cs-back::before { content: '←'; font-size: 12px; }
.cs-category {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.25em;
  text-transform: uppercase; color: var(--moonbow);
  margin-bottom: 24px; display: flex; align-items: center; gap: 12px;
}
.cs-category::before {
  content: ''; width: 24px; height: 1px; display: block;
  background: linear-gradient(90deg, var(--steel), var(--moonbow) 55%, var(--gold));
}
.cs-title {
  font-family: var(--font-display); font-size: clamp(40px, 5vw, 72px);
  font-weight: 300; line-height: 1.05; color: var(--d-fg); margin-bottom: 30px;
}
.cs-title em { font-style: italic; color: var(--lavender); }
.cs-subtitle {
  font-size: 14px; color: var(--d-body); line-height: 1.8; max-width: 460px;
  border-left: 1px solid color-mix(in srgb, var(--moonbow) 28%, transparent);
  padding-left: 24px;
}
.cs-hero-right { position: relative; overflow: hidden; background: var(--navy-2); }
.cs-hero-right::after {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(140,164,224,0.10) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(76,89,122,0.18) 0%, transparent 50%);
}
.cs-hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(140,164,224,0.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140,164,224,0.10) 1px, transparent 1px);
  background-size: 60px 60px; opacity: 0.5;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

/* ── Meta bar (dark — bookends the hero) ── */
.cs-meta {
  background: var(--navy);
  border-top: 1px solid rgba(140,164,224,0.16);
  border-bottom: 1px solid rgba(140,164,224,0.16);
  padding: 28px 60px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
}
.cs-meta-item { padding: 0 32px; border-right: 1px solid rgba(140,164,224,0.16); }
.cs-meta-item:first-child { padding-left: 0; }
.cs-meta-item:last-child { border-right: none; }
.cs-meta-label {
  font-family: var(--font-mono); font-size: 8px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--d-dim); margin-bottom: 6px;
}
.cs-meta-value { font-size: 13px; color: var(--d-body); }

/* ── Content body (paper) ── */
.cs-body { max-width: 1200px; margin: 0 auto; padding: 100px 60px; }
.cs-section { margin-bottom: 80px; }
.cs-section-label {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.25em;
  text-transform: uppercase; color: var(--accent-ink);
  margin-bottom: 32px; display: flex; align-items: center; gap: 16px;
}
.cs-section-label::after { content: ''; flex: 1; height: 1px; background: var(--paper-line); }
.cs-section-title {
  font-family: var(--font-display); font-size: 32px; font-weight: 300;
  color: var(--ink); margin-bottom: 24px; line-height: 1.2;
}
.cs-section-title em { font-style: italic; color: var(--accent-ink); }
.cs-context-text { font-size: 15px; color: var(--ink-mid); line-height: 1.9; max-width: 760px; }

.cs-two-col {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--paper-line); margin-top: 40px;
}
.cs-col-block { background: var(--paper-2); padding: 48px 40px; }
.cs-col-title {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent-ink); margin-bottom: 32px; padding-bottom: 16px;
  border-bottom: 1px solid var(--paper-line-2);
}
.cs-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 16px; }
.cs-list li { font-size: 13px; color: var(--ink-mid); line-height: 1.75; padding-left: 20px; position: relative; }
.cs-list li::before { content: '—'; position: absolute; left: 0; color: var(--gold); opacity: 0.8; }

.cs-interventions {
  display: flex; flex-direction: column; gap: 1px;
  background: var(--paper-line); margin-top: 40px;
}
.cs-intervention-item {
  background: var(--paper); padding: 28px 40px;
  display: grid; grid-template-columns: 40px 1fr; gap: 24px; align-items: start;
  transition: background 0.2s; position: relative;
}
.cs-intervention-item::before {
  content: ''; position: absolute; top: 0; left: 0; bottom: 0; width: 1px;
  background: linear-gradient(180deg, var(--moonbow), var(--gold));
  transform: scaleY(0); transform-origin: top; transition: transform 0.4s var(--ease);
}
.cs-intervention-item:hover { background: var(--paper-raised); }
.cs-intervention-item:hover::before { transform: scaleY(1); }
.cs-intervention-num {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.15em;
  color: var(--ink-dim); padding-top: 3px;
}
.cs-intervention-text { font-size: 13px; color: var(--ink-mid); line-height: 1.75; }

.cs-outcome {
  background: var(--paper-2); border: 1px solid var(--paper-line-2);
  padding: 56px; margin-top: 40px; position: relative; overflow: hidden;
}
.cs-outcome::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, var(--moonbow), var(--gold));
}
.cs-outcome-text {
  font-family: var(--font-display); font-size: 22px; font-weight: 300;
  color: var(--ink); line-height: 1.6; max-width: 800px;
}
.cs-outcome-text em { font-style: italic; color: var(--accent-ink); }

.cs-nav-bottom {
  border-top: 1px solid var(--paper-line); padding: 60px;
  display: flex; justify-content: space-between; align-items: center;
}
.cs-nav-back {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-dim); text-decoration: none; display: flex; align-items: center; gap: 12px;
  transition: color 0.2s;
}
.cs-nav-back:hover { color: var(--accent-ink); }
.cs-nav-back::before { content: '←'; }
.cs-nav-next {
  text-align: right; text-decoration: none; display: flex; flex-direction: column;
  align-items: flex-end; gap: 6px; transition: opacity 0.2s;
}
.cs-nav-next:hover { opacity: 0.7; }
.cs-nav-next-label {
  font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--ink-dim);
}
.cs-nav-next-title {
  font-family: var(--font-display); font-size: 20px; font-weight: 300; color: var(--ink);
  display: flex; align-items: center; gap: 12px;
}
.cs-nav-next-title::after { content: '→'; color: var(--gold); font-size: 16px; }

@media (max-width: 1024px) {
  .cs-hero { grid-template-columns: 1fr; min-height: auto; padding-top: 120px; }
  .cs-hero-left { padding: 60px 28px 48px; }
  .cs-hero-right { display: none; }
  .cs-meta { padding: 24px 28px; grid-template-columns: repeat(2, 1fr); }
  .cs-meta-item { padding: 16px 0; border-right: none; border-bottom: 1px solid rgba(140,164,224,0.16); }
  .cs-body { padding: 60px 28px; }
  .cs-two-col { grid-template-columns: 1fr; }
  .cs-outcome { padding: 40px 28px; }
  .cs-nav-bottom { padding: 40px 28px; flex-direction: column; gap: 32px; align-items: flex-start; }
}