/* ─── RESEARCH PAGE ──────────────────────────────────
   Reuses about.css components (ab-hero, ab-section-title,
   ab-cb-*). Page-specific components use the `rs-` prefix.

   NOTE: every page stylesheet is loaded globally by
   index.html, so class names here must stay unique
   across the whole site.                              */

/* ── Research hero background image ──
   Scoped to this page only — the shared .ab-hero (about.css) used
   on Services/Products stays a plain gradient.                   */
.ab-hero.ab-hero--research {
  background:
    linear-gradient(to bottom, rgba(0,0,0,.25) 0%, rgba(0,0,0,.72) 100%),
    linear-gradient(135deg, rgba(11,30,78,.55) 0%, rgba(22,56,131,.4) 50%, rgba(26,77,183,.5) 100%),
    url('../../../images/research-banner.jpg') center / cover no-repeat;
}

/* Shared section heading block */
.rs-head { max-width: 720px; margin-bottom: 40px; }
.rs-head .ab-section-title { margin-bottom: 0; }
.rs-head__lead {
  margin: 16px 0 0;
  color: var(--c-muted);
  font-size: var(--tx-base);
  line-height: 1.75;
}

/* ══════════════════════════════════════════════════
   AT A GLANCE — metric row
══════════════════════════════════════════════════ */
.rs-stats {
  background: #fff;
  border-bottom: 1px solid var(--c-line);
}
.rs-stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.rs-stat { padding: 40px 30px; border-left: 1px solid var(--c-line); }
.rs-stat:first-child { border-left: 0; padding-left: 0; }
.rs-stat strong {
  display: block;
  color: var(--c-primary);
  font-size: clamp(2.1rem, 3.6vw, 3.1rem);
  font-weight: 700;
  letter-spacing: -.035em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.rs-stat span {
  display: block;
  margin-top: 12px;
  color: var(--c-muted);
  font-size: var(--tx-sm);
}

/* ══════════════════════════════════════════════════
   RESEARCH DOMAINS — bento grid
══════════════════════════════════════════════════ */
.rs-domains {
  background: #f7f9fc;
  padding: clamp(56px, 9vh, 100px) 0;
}
.rs-domain-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.rs-domain {
  position: relative;
  padding: 32px 28px;
  border: 1px solid var(--c-line);
  border-radius: 16px;
  background: #fff;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), transform .25s var(--ease);
}
.rs-domain:hover {
  border-color: rgba(22,56,131,.4);
  box-shadow: 0 16px 38px rgba(16,43,94,.09);
  transform: translateY(-4px);
}
/* First card spans two columns so five cards fill three columns cleanly */
.rs-domain--wide { grid-column: span 2; }

.rs-domain__n {
  position: absolute;
  top: 30px;
  right: 28px;
  color: var(--c-faint);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
}
.rs-domain__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 20px;
  border-radius: 13px;
  background: rgba(22,56,131,.08);
  color: var(--c-primary);
  font-size: 1.35rem;
  transition: background .25s, color .25s;
}
.rs-domain:hover .rs-domain__icon { background: var(--c-primary); color: #fff; }
.rs-domain h3 {
  margin-bottom: 10px;
  color: var(--c-ink);
  font-family: var(--font);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.3;
}
.rs-domain p {
  margin: 0;
  color: var(--c-muted);
  font-size: var(--tx-sm);
  line-height: 1.7;
}
.rs-domain__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}
.rs-domain__tags li {
  padding: 4px 11px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  color: var(--c-ink2);
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}

/* ══════════════════════════════════════════════════
   PROGRAM INDEX — filterable abstracts
══════════════════════════════════════════════════ */
.rs-programs {
  background: #fff;
  padding: clamp(56px, 9vh, 100px) 0;
}

.rs-filter { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
.rs-chip {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 18px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  background: #fff;
  color: var(--c-ink);
  font-family: var(--font);
  font-size: var(--tx-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background .2s, border-color .2s, color .2s, transform .15s;
}
.rs-chip b { color: var(--c-muted); font-size: 11px; font-weight: 700; transition: color .2s; }
.rs-chip:hover { border-color: var(--c-primary); color: var(--c-primary); transform: translateY(-1px); }
.rs-chip.is-active { background: var(--c-primary); border-color: var(--c-primary); color: #fff; }
.rs-chip.is-active b { color: rgba(255,255,255,.72); }
.rs-chip:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 3px; }

.rs-count {
  margin: 0 0 28px;
  color: var(--c-muted);
  font-size: var(--tx-sm);
}

.rs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  align-items: start;
}
.rs-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 28px 26px 30px;
  border: 1px solid var(--c-line);
  border-radius: 16px;
  background: #fff;
  overflow: hidden;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), transform .25s var(--ease);
}
.rs-card[hidden] { display: none; }
/* Accent rule that draws itself in on hover */
.rs-card::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--c-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .4s var(--ease);
}
.rs-card:hover {
  border-color: rgba(22,56,131,.4);
  box-shadow: 0 16px 38px rgba(16,43,94,.09);
  transform: translateY(-4px);
}
.rs-card:hover::before { transform: scaleX(1); }

.rs-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.rs-card__num {
  color: var(--c-primary);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
}
.rs-card__tag {
  padding: 5px 11px;
  border-radius: var(--r-pill);
  background: rgba(22,56,131,.08);
  color: var(--c-primary);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  white-space: nowrap;
}
.rs-card h3 {
  margin-bottom: 12px;
  color: var(--c-ink);
  font-family: var(--font);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.35;
}
.rs-card p {
  margin: 0;
  color: var(--c-muted);
  font-size: var(--tx-sm);
  line-height: 1.72;
}

/* ══════════════════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════════════════ */
@media (max-width: 991px) {
  .rs-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .rs-stat { padding: 30px 24px; }
  .rs-stat:nth-child(odd) { border-left: 0; padding-left: 0; }
  .rs-stat:nth-child(n+3) { border-top: 1px solid var(--c-line); }

  .rs-domain-grid,
  .rs-grid { grid-template-columns: repeat(2, 1fr); }
  .rs-domain--wide { grid-column: span 2; }
}

@media (max-width: 640px) {
  .rs-stats-grid { grid-template-columns: 1fr 1fr; }
  .rs-domain-grid,
  .rs-grid { grid-template-columns: 1fr; }
  .rs-domain--wide { grid-column: auto; }
  .rs-head { margin-bottom: 30px; }
  .rs-filter { gap: 8px; }
  .rs-chip { padding: 9px 14px; font-size: 13px; }
  .rs-card { padding: 24px 20px 26px; }
  .rs-card__top { flex-wrap: wrap; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .rs-domain, .rs-card, .rs-chip { transition-duration: .01ms !important; }
  .rs-card::before { transition: none; }
}