/* ============================================================
   Case Study Long-Form — design system for deep-dive pages
   (/projects/keja-ai/, /projects/tapi-learn/, future cases)
   Inherits site tokens from styles.css; adds article typography.
   ============================================================ */

.cs-wrap { max-width: 880px; margin: 0 auto; padding: 0 1.5rem; }

/* ---------- Hero ---------- */
.cs-hero {
  position: relative;
  padding: 8.5rem 0 4rem;
  overflow: hidden;
  background:
    radial-gradient(900px 420px at 15% -10%, var(--glow), transparent 60%),
    radial-gradient(700px 380px at 95% 10%, var(--glow-2), transparent 60%);
}
.cs-eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-size: .8rem; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent);
  background: var(--glass); border: 1px solid var(--border);
  padding: .45rem .9rem; border-radius: 999px; margin-bottom: 1.4rem;
}
.cs-eyebrow .pulse-dot { width: 8px; height: 8px; }
.cs-hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.12;
  letter-spacing: -.02em; margin: 0 0 1.1rem; max-width: 800px;
}
.cs-hero h1 .grad-text {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.cs-lede {
  font-size: 1.13rem; line-height: 1.65; color: var(--text-muted);
  max-width: 680px; margin: 0 0 2rem;
}
.cs-meta-row {
  display: flex; flex-wrap: wrap; gap: .6rem .55rem; margin-bottom: 2.2rem;
}
.cs-meta-chip {
  font-size: .78rem; color: var(--text-muted);
  background: var(--bg-card); border: 1px solid var(--border);
  padding: .4rem .8rem; border-radius: 999px;
}
.cs-meta-chip strong { color: var(--text); font-weight: 600; }

/* ---------- Outcomes stat band ---------- */
.cs-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem;
  margin: 0 0 1rem;
}
.cs-stat {
  background: var(--glass); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.2rem 1.1rem; text-align: left;
}
.cs-stat .n {
  font-size: 1.7rem; font-weight: 700; letter-spacing: -.02em;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.cs-stat .l { font-size: .78rem; color: var(--text-muted); margin-top: .3rem; line-height: 1.4; }
.cs-stat-note {
  grid-column: 1 / -1; font-size: .75rem; color: var(--text-dim); margin: 0;
}

/* ---------- Body typography ---------- */
.cs-body { padding: 2rem 0 3rem; }
.cs-body h2 {
  font-size: 1.55rem; letter-spacing: -.01em; margin: 3.2rem 0 1rem;
  padding-top: 1.6rem; border-top: 1px solid var(--border);
  display: flex; align-items: baseline; gap: .8rem;
}
.cs-body h2 .sn {
  font-size: .85rem; font-weight: 600; color: var(--accent);
  font-variant-numeric: tabular-nums; opacity: .85; flex: none;
}
.cs-body p { font-size: 1.02rem; line-height: 1.75; color: var(--text-muted); margin: 0 0 1.15rem; }
.cs-body p strong, .cs-body li strong { color: var(--text); }
.cs-body ul { margin: 0 0 1.3rem; padding-left: 1.2rem; }
.cs-body li { font-size: 1rem; line-height: 1.7; color: var(--text-muted); margin-bottom: .55rem; }
.cs-body li::marker { color: var(--accent); }
.cs-blockquote {
  margin: 1.6rem 0; padding: 1.2rem 1.4rem;
  border-left: 3px solid var(--accent);
  background: var(--glass); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 1.05rem; line-height: 1.65; color: var(--text);
}
/* ---------- Client quote (approved testimonial) ---------- */
.cs-quote {
  margin: 1.8rem 0 2.2rem; padding: 1.3rem 1.5rem;
  border: 1px solid var(--border); border-left: 3px solid var(--accent-2);
  background: var(--glass); border-radius: var(--radius-sm);
}
.cs-quote .label {
  font-size: .72rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase;
  color: var(--text-dim); margin-bottom: .55rem;
}
.cs-quote .q { margin: 0; font-size: 1.02rem; line-height: 1.7; font-style: italic; color: var(--text); }
.cs-quote .who { margin-top: .75rem; font-size: .88rem; font-weight: 600; color: var(--text-muted); }
.cs-quote .who .org { color: var(--accent); }
.cs-callout {
  margin: 1.8rem 0; padding: 1.3rem 1.4rem;
  background: linear-gradient(135deg, rgba(0,212,255,.07), rgba(168,85,247,.05));
  border: 1px solid var(--border); border-radius: var(--radius);
}
.cs-callout .t { font-weight: 700; color: var(--text); margin-bottom: .45rem; font-size: .95rem; }
.cs-callout p { margin: 0; font-size: .95rem; }

/* ---------- Built blocks (feature grid) ---------- */
.cs-build-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.4rem 0 1.8rem; }
.cs-build {
  background: var(--glass); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem;
}
.cs-build .icon { font-size: 1.5rem; margin-bottom: .6rem; }
.cs-build h4 { font-size: 1rem; margin: 0 0 .5rem; color: var(--text); }
.cs-build p { font-size: .88rem; line-height: 1.6; color: var(--text-muted); margin: 0; }

/* ---------- Lifecycle / pipeline rail ---------- */
.cs-rail {
  display: flex; flex-wrap: wrap; align-items: stretch; gap: .5rem;
  margin: 1.4rem 0 1.8rem;
}
.cs-rail .seg {
  flex: 1 1 110px; position: relative; text-align: center;
  background: var(--glass); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: .8rem .5rem .7rem;
}
.cs-rail .seg .i { font-size: .68rem; font-weight: 700; color: var(--accent); letter-spacing: .06em; }
.cs-rail .seg .t { font-size: .85rem; font-weight: 600; color: var(--text); margin-top: .2rem; }
.cs-rail .seg .d { font-size: .68rem; color: var(--text-dim); margin-top: .25rem; line-height: 1.35; }

/* ---------- Verdict table ---------- */
.cs-table-wrap { overflow-x: auto; margin: 1.4rem 0 1.8rem; border: 1px solid var(--border); border-radius: var(--radius); }
.cs-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.cs-table th, .cs-table td { text-align: left; padding: .8rem 1rem; border-bottom: 1px solid var(--border); }
.cs-table th { color: var(--text); font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; background: var(--bg-card); }
.cs-table td { color: var(--text-muted); line-height: 1.55; }
.cs-table tr:last-child td { border-bottom: none; }
.cs-table td.strong { color: var(--text); font-weight: 600; }

/* ---------- Takeaway / transfer section ---------- */
.cs-take {
  background: linear-gradient(135deg, rgba(16,185,129,.08), rgba(0,212,255,.05));
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.6rem 1.6rem 1.3rem; margin: 3rem 0 0;
}
.cs-take h3 { font-size: 1.15rem; margin: 0 0 .9rem; color: var(--text); }
.cs-take ul { margin: 0; padding-left: 1.2rem; }
.cs-take li { font-size: .95rem; line-height: 1.65; color: var(--text-muted); margin-bottom: .6rem; }

/* ---------- CTA band + next-case ---------- */
.cs-cta {
  margin: 3rem 0 0; padding: 2rem;
  text-align: center; border-radius: var(--radius);
  background:
    radial-gradient(600px 200px at 50% 0%, var(--glow), transparent 70%),
    var(--glass);
  border: 1px solid var(--border);
}
.cs-cta h3 { font-size: 1.45rem; margin: 0 0 .6rem; }
.cs-cta p { color: var(--text-muted); max-width: 560px; margin: 0 auto 1.4rem; line-height: 1.6; }
.cs-cta .actions { display: flex; justify-content: center; flex-wrap: wrap; gap: .8rem; }
.cs-next {
  margin-top: 1rem; padding-top: 1.6rem; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.cs-next a { color: var(--text-muted); font-size: .9rem; }
.cs-next a:hover { color: var(--accent); }
.cs-next .flag { display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--text-dim); margin-bottom: .25rem; }
.cs-next .name { font-weight: 600; color: var(--text); }

/* ---------- Breadcrumbs ---------- */
.cs-crumbs { font-size: .8rem; color: var(--text-dim); margin-bottom: 1.2rem; }
.cs-crumbs a { color: var(--text-muted); }
.cs-crumbs a:hover { color: var(--accent); }
.cs-crumbs .sep { margin: 0 .45rem; opacity: .5; }

/* ---------- Responsive ---------- */
@media (max-width: 780px) {
  .cs-stats { grid-template-columns: repeat(2, 1fr); }
  .cs-build-grid { grid-template-columns: 1fr; }
  .cs-hero { padding: 7rem 0 3rem; }
}
@media (prefers-reduced-motion: reduce) {
  .cs-hero { background: none; }
}

/* ---------- Print ---------- */
@media print {
  .cs-hero { padding: 1.5rem 0; background: none; }
  .cs-crumbs, .cs-next, .cs-cta .actions { display: none; }
  .cs-body h2 { border-top-color: #ddd; }
}