/* ---- Research Cards (standalone) ------------------------------- */
/* Safe fallbacks if your global CSS variables aren't present */
:root{
  --card:#ffffff;
  --ring:#e5e7eb;         /* light gray border */
  --brand:#111827;        /* near-black */
  --muted:#000000;        /* gray-500 */
  --ink:#111827;
}

.research-cards { margin-top: 2rem; }
.research-cards .intro { color: var(--muted); max-width: 70ch; }

.research-grid{
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* base card */
.r-card{
  position: relative;
  background: var(--card);
  border: 1px solid var(--ring);
  border-radius: 14px;
  padding: 1.25rem 2.5rem 1.25rem 1.5rem; /* extra right for chevron/pill */
  cursor: pointer;
  transition: box-shadow .25s ease, transform .25s ease, border-color .25s ease;

  /* reveal-on-scroll initial state */
  opacity: 0;
  transform: translateY(8px);
}
.r-card.is-visible{
  opacity: 1;
  transform: translateY(0);
  transition: opacity .5s ease, transform .5s ease, box-shadow .25s ease, border-color .25s ease;
}

.r-card:hover{
  box-shadow: 0 8px 20px rgba(0,0,0,.08);
  transform: translateY(-2px);
}
.r-card:focus-visible{
  outline: 3px solid color-mix(in srgb, var(--brand, #000), #fff 70%);
  outline-offset: 2px;
}

.r-card h3{
  font-size: 1.1rem;
  margin: 0 0 .25rem;
}
.r-card .summary{
  color: var(--muted);
  margin: 0 0 .5rem;
    font-size: 1rem;
}

/* details disclosure */
.r-card .details{
  display: none;
  color: var(--ink);
  margin-top: .6rem;
  line-height: 1.45;
}
.r-card.expanded .details{ display: block; }

/* chevron (CSS) */
.r-chev{
  position: absolute;
  top: 18px; right: 14px;
  width: 10px; height: 10px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  opacity: .6;
  transition: transform .25s ease, opacity .25s ease;
}
.r-card:hover .r-chev{ opacity: .9; }
.r-card.expanded .r-chev{ transform: rotate(135deg); } /* up when open */

/* “Learn more” pill */
.r-more{
  position: absolute; right: 10px; bottom: 10px;
  font: 600 12px/1 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  padding: .3rem .5rem;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--ring);
  color: var(--muted);
  box-shadow: 0 2px 6px rgba(0,0,0,.05);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity .2s ease, transform .2s ease;
}
@media (hover:hover){
  .r-card:hover .r-more{ opacity: 1; transform: translateY(0); }
}
@media (hover:none){
  .r-more{ opacity: 1; transform: none; } /* always visible on touch */
}

/* corner badge */
.r-card[data-badge]::after{
  content: attr(data-badge);
  position: absolute; top: -5px; left: -5px;
  padding: .25rem .45rem;
  font: 700 11px/1 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  color: #fff;
  background: color-mix(in srgb, var(--brand, #000), #000 15%);
  border-radius: 999px;
  box-shadow: 0 2px 6px rgba(0,0,0,.08);
}
/* optional color hints */
.r-card[data-badge^="NEW"]::after{ background:#16a34a; }
.r-card[data-badge^="Updated"]::after{ background:#0ea5e9; }
.r-card[data-badge^="Engagement"]::after,
.r-card[data-badge^="Motivation"]::after,
.r-card[data-badge^="Problem-solving"]::after{ background:#9333ea; }

/* accessibility: no motion for users who prefer reduced motion */
@media (prefers-reduced-motion: reduce){
  .r-card, .r-card.is-visible{
    opacity: 1; transform: none; transition: none;
  }
}