/* ============================================================
   Case Studies page — Option A (editorial featured + grid)
   Reuses tokens, nav, footer, buttons from styles.css
   ============================================================ */

/* ---- page hero (navy band) ---- */
.cs-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--space-13) + 56px) 0 var(--space-11);
  text-align: center;
  background: var(--color-midnight-800);
  color: #fff;
}
.cs-hero__deco {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(720px 340px at 82% -8%, rgba(220,16,46,0.20), transparent 60%),
    radial-gradient(560px 300px at 8% 108%, rgba(37,99,235,0.14), transparent 60%);
}
.cs-hero__deco::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.10) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: radial-gradient(640px 300px at 50% 0%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(640px 300px at 50% 0%, #000 0%, transparent 75%);
}
.cs-hero__inner { position: relative; z-index: 1; max-width: 760px; margin: 0 auto; }
.cs-hero__pill {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display); font-size: var(--text-2xs); font-weight: var(--fw-bold);
  letter-spacing: var(--tracking-caps); text-transform: uppercase;
  color: #fff; background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.18);
  padding: 7px 14px; border-radius: var(--radius-pill);
}
.cs-hero__pill-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--color-crimson-500); box-shadow: 0 0 0 4px rgba(220,16,46,0.25); }
.cs-hero__title {
  font-family: var(--font-display);
  font-size: clamp(34px, 5vw, 54px);
  font-weight: var(--fw-bold);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: var(--space-6) 0 0;
  color: #fff;
}
.cs-hero__title em { font-style: normal; color: var(--color-crimson-400); }
.cs-hero__sub {
  font-size: clamp(16px, 2.2vw, 19px);
  color: rgba(255,255,255,0.72);
  line-height: 1.6;
  margin: var(--space-5) auto 0;
  max-width: 580px;
}
.cs-hero__stats {
  display: inline-flex;
  justify-content: center;
  gap: 0;
  margin-top: var(--space-9);
  flex-wrap: wrap;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius-xl);
  padding: var(--space-6) 0;
}
.cs-hero__stat { padding: 0 var(--space-8); }
.cs-hero__stat + .cs-hero__stat { border-left: 1px solid rgba(255,255,255,0.14); }
.cs-hero__stat b {
  display: block;
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: var(--fw-bold);
  color: #fff;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.cs-hero__stat span {
  display: block;
  margin-top: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-2xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: rgba(255,255,255,0.55);
}

/* ---- shared image placeholder ---- */
.csimg {
  position: relative; overflow: hidden;
  background: var(--bg-surface);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; color: var(--fg-secondary);
}
.csimg::before {
  content: ""; position: absolute; inset: 0; opacity: 0.5; pointer-events: none;
  background-image:
    linear-gradient(45deg, rgba(10,26,47,0.03) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(10,26,47,0.03) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(10,26,47,0.03) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(10,26,47,0.03) 75%);
  background-size: 18px 18px;
  background-position: 0 0, 0 9px, 9px -9px, -9px 0;
}
.csimg > * { position: relative; z-index: 1; padding: 0 16px; }
.csimg__ico { width: 34px; height: 34px; color: var(--color-crimson-500); margin-bottom: 8px; }
.csimg__ico svg { width: 100%; height: 100%; }
.csimg__t { font-family: var(--font-display); font-size: var(--text-sm); font-weight: var(--fw-semibold); color: var(--fg-primary); margin: 0 0 4px; }
.csimg__d { font-size: var(--text-2xs); color: var(--fg-tertiary); line-height: 1.45; max-width: 280px; }
.csimg img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 2; }

/* ---- featured story ---- */
.csa-featured {
  display: grid; grid-template-columns: 1.15fr 1fr;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin-bottom: var(--space-9);
}
.csa-featured .csimg { min-height: 460px; border-right: 1px solid var(--border-subtle); }
.csa-featured__body { padding: var(--space-9); display: flex; flex-direction: column; }
.csa-featured__chip {
  align-self: flex-start;
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--color-crimson-50); color: var(--color-crimson-700);
  font-family: var(--font-display); font-size: var(--text-2xs); font-weight: var(--fw-bold);
  letter-spacing: var(--tracking-caps); text-transform: uppercase;
  padding: 6px 12px; border-radius: var(--radius-pill); margin-bottom: var(--space-5);
}
.csa-featured__client { font-family: var(--font-display); font-size: var(--text-sm); font-weight: var(--fw-semibold); color: var(--fg-tertiary); margin: 0 0 var(--space-3); }
.csa-featured__h { font-family: var(--font-display); font-size: var(--text-3xl); font-weight: var(--fw-bold); color: var(--fg-primary); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 var(--space-6); }
.csa-featured__h em { font-style: normal; color: var(--color-crimson-500); }
.csa-metrics { display: flex; gap: var(--space-7); margin-bottom: var(--space-6); flex-wrap: wrap; }
.csa-metric__n { font-family: var(--font-display); font-size: 34px; font-weight: var(--fw-bold); color: var(--fg-primary); line-height: 1; font-variant-numeric: tabular-nums; }
.csa-metric__n .u { color: var(--color-crimson-500); }
.csa-metric__l { font-size: var(--text-2xs); color: var(--fg-tertiary); font-family: var(--font-display); font-weight: var(--fw-semibold); margin-top: 6px; text-transform: uppercase; letter-spacing: 0.06em; }
.csa-featured__quote { font-size: var(--text-base); color: var(--fg-secondary); line-height: 1.6; font-style: italic; border-left: 2px solid var(--color-crimson-200); padding-left: var(--space-5); margin: 0 0 var(--space-7); }
.csa-featured__foot { margin-top: auto; display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; }
.csa-featured__more { margin-left: auto; font-size: var(--text-sm); }
.csa-avatar { width: 40px; height: 40px; border-radius: 50%; background: var(--color-midnight-800); color: #fff; display: inline-flex; align-items: center; justify-content: center; font-family: var(--font-display); font-weight: var(--fw-bold); font-size: var(--text-xs); flex-shrink: 0; overflow: hidden; }
.csa-avatar img { width: 100%; height: 100%; object-fit: cover; }
.csa-byline b { display: block; font-family: var(--font-display); font-size: var(--text-sm); color: var(--fg-primary); }
.csa-byline span { font-size: var(--text-2xs); color: var(--fg-tertiary); }

/* ---- grid ---- */
.csa-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.csa-card {
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl); overflow: hidden;
  box-shadow: var(--shadow-xs); display: flex; flex-direction: column;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.csa-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.csa-card .csimg { aspect-ratio: 16/10; border-bottom: 1px solid var(--border-subtle); }
.csa-card__body { padding: var(--space-6); display: flex; flex-direction: column; flex: 1; }
.csa-card__tag { align-self: flex-start; font-family: var(--font-display); font-size: 10px; font-weight: var(--fw-bold); letter-spacing: 0.06em; text-transform: uppercase; color: var(--color-midnight-600); background: var(--bg-canvas); border: 1px solid var(--border-subtle); padding: 4px 9px; border-radius: var(--radius-pill); margin-bottom: var(--space-4); }
.csa-card__client { font-family: var(--font-display); font-size: var(--text-2xs); color: var(--fg-tertiary); font-weight: var(--fw-semibold); margin: 0 0 var(--space-2); }
.csa-card__h { font-family: var(--font-display); font-size: var(--text-lg); font-weight: var(--fw-bold); color: var(--fg-primary); line-height: 1.25; margin: 0 0 var(--space-5); }
.csa-card__stats { display: flex; gap: var(--space-5); padding-top: var(--space-5); margin-top: auto; border-top: 1px solid var(--border-subtle); }
.csa-card__stat b { font-family: var(--font-display); font-size: var(--text-lg); font-weight: var(--fw-bold); color: var(--color-crimson-600); display: block; line-height: 1; font-variant-numeric: tabular-nums; }
.csa-card__stat span { font-size: 10px; color: var(--fg-tertiary); font-family: var(--font-display); font-weight: var(--fw-semibold); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 4px; display: block; }
.csa-card__more {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: var(--space-5);
  font-family: var(--font-display); font-size: var(--text-sm); font-weight: var(--fw-semibold);
  color: var(--color-crimson-600); text-decoration: none;
}
.csa-card__more span { transition: transform var(--dur-fast) var(--ease-out); }
.csa-card__more:hover { color: var(--color-crimson-700); text-decoration: none; opacity: 1; }
.csa-card__more:hover span { transform: translateX(3px); }

/* ---- closing CTA band ---- */
.cs-cta {
  margin-top: var(--space-11);
  background: var(--color-midnight-900, #0A1A2F);
  border-radius: var(--radius-2xl);
  padding: var(--space-11) var(--space-9);
  text-align: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.cs-cta::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(600px 300px at 50% 0%, rgba(220,16,46,0.22), transparent 70%);
}
.cs-cta__inner { position: relative; z-index: 1; max-width: 620px; margin: 0 auto; }
.cs-cta__h { font-family: var(--font-display); font-size: var(--text-3xl); font-weight: var(--fw-bold); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 var(--space-4); color: #fff; }
.cs-cta__p { font-size: var(--text-lg); color: rgba(255,255,255,0.75); line-height: 1.6; margin: 0 0 var(--space-8); }

/* ---- responsive ---- */
@media (max-width: 920px) {
  .csa-featured { grid-template-columns: 1fr; }
  .csa-featured .csimg { border-right: 0; border-bottom: 1px solid var(--border-subtle); min-height: 300px; }
  .csa-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .cs-hero__stats { padding: var(--space-5) 0; }
  .cs-hero__stat { padding: 0 var(--space-5); }
  .cs-hero__stat b { font-size: 28px; }
  .csa-featured__more { margin-left: 0; width: 100%; justify-content: center; }
  .csa-featured__body { padding: var(--space-7); }
  .cs-cta { padding: var(--space-9) var(--space-6); }
}