/* ============================================================
   CASE STUDIES PAGE
   ============================================================ */

.filter-section{ padding-bottom:56px; }
.filter-tabs{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding:8px;
  border:1px solid rgba(255,255,255,0.08);
  border-radius:16px;
  background:rgba(255,255,255,0.02);
}
.filter-tab{
  position:relative;
  z-index:2;
  padding:11px 18px;
  border-radius:11px;
  font-size:13.5px;
  font-weight:500;
  color:var(--text-muted);
  white-space:nowrap;
  transition:color .35s ease;
}
.filter-tab:hover{ color:var(--text-primary); }
.filter-tab.is-active{ color:var(--navy-950); font-weight:600; }
.filter-tab-glider{
  position:absolute;
  z-index:1;
  top:8px; left:8px;
  border-radius:11px;
  background:linear-gradient(120deg,var(--gold-bright),var(--emerald-bright));
  box-shadow:0 8px 22px -8px rgba(34,199,147,0.4);
  transition:transform .45s var(--ease-out), width .45s var(--ease-out), height .3s ease;
}

/* -------- Case grid (page version, larger than homepage teaser cards) -------- */
.case-page-section{ padding-bottom:var(--section-pad); }
.case-page-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.case-page-grid .case-page-card:nth-child(1){ transition-delay:0s; }
.case-page-grid .case-page-card:nth-child(2){ transition-delay:.08s; }
.case-page-grid .case-page-card:nth-child(3){ transition-delay:.16s; }
.case-page-grid .case-page-card:nth-child(4){ transition-delay:.24s; }
.case-page-grid .case-page-card:nth-child(5){ transition-delay:.32s; }
.case-page-card{
  background:linear-gradient(160deg,var(--charcoal-800),var(--navy-900));
  border:1px solid rgba(255,255,255,0.07);
  border-radius:20px;
  padding:30px 28px 32px;
  cursor:pointer;
  transition: transform .45s var(--ease-out), box-shadow .45s ease, border-color .45s ease, opacity .45s ease;
}
.case-page-card:hover, .case-page-card:focus-visible{
  transform:translateY(-6px);
  border-color:var(--border-emerald-soft);
  box-shadow:0 26px 50px -22px rgba(0,0,0,0.55), 0 0 40px -18px rgba(34,199,147,0.28);
  outline:none;
}
.case-page-card.is-hidden{
  opacity:0;
  transform:scale(0.94);
  pointer-events:none;
}
.case-page-visual{
  margin-bottom:22px;
  padding:14px 4px 4px;
  border-bottom:1px solid rgba(255,255,255,0.06);
}
.results-graphic{ width:100%; height:52px; }
.case-page-tag{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:0.05em;
  text-transform:uppercase;
  color:var(--gold-bright);
  margin-bottom:12px;
}
.case-page-title{
  font-family:var(--font-display);
  font-size:18.5px;
  font-weight:600;
  line-height:1.35;
  margin-bottom:10px;
}
.case-page-summary{
  font-size:14px;
  color:var(--text-muted);
  line-height:1.55;
  margin-bottom:18px;
}
.case-page-metric{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12.5px;
  font-weight:600;
  color:var(--emerald-bright);
  background:rgba(34,199,147,0.08);
  border:1px solid var(--border-emerald-soft);
  padding:6px 12px;
  border-radius:999px;
}
.filter-empty{
  text-align:center;
  color:var(--text-muted);
  padding:60px 0;
  font-size:14.5px;
}

/* -------- Lightbox -------- */
.lightbox{
  position:fixed; inset:0;
  z-index:100;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}
.lightbox[hidden]{ display:none; }
.lightbox-backdrop{
  position:absolute; inset:0;
  background:rgba(5,7,13,0.78);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  opacity:0;
  transition:opacity .35s ease;
}
.lightbox.is-open .lightbox-backdrop{ opacity:1; }
.lightbox-panel{
  position:relative;
  z-index:2;
  width:100%;
  max-width:620px;
  max-height:85vh;
  overflow-y:auto;
  background:linear-gradient(165deg,var(--charcoal-800),var(--navy-900));
  border:1px solid var(--border-soft);
  border-radius:22px;
  padding:44px 40px;
  box-shadow:0 40px 90px -30px rgba(0,0,0,0.7);
  opacity:0;
  transform:translateY(24px) scale(0.98);
  transition:opacity .4s var(--ease-out), transform .4s var(--ease-out);
}
.lightbox.is-open .lightbox-panel{ opacity:1; transform:translateY(0) scale(1); }
.lightbox-close{
  position:absolute;
  top:20px; right:20px;
  width:36px; height:36px;
  border-radius:50%;
  border:1px solid rgba(255,255,255,0.12);
  display:flex; align-items:center; justify-content:center;
  color:var(--text-muted);
  transition:color .25s ease, border-color .25s ease, transform .25s ease;
}
.lightbox-close:hover{ color:var(--gold-bright); border-color:var(--gold-bright); transform:rotate(90deg); }
.lightbox-tag{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:0.05em;
  text-transform:uppercase;
  color:var(--gold-bright);
  margin-bottom:12px;
}
.lightbox-title{
  font-family:var(--font-display);
  font-size:clamp(21px,2.6vw,27px);
  font-weight:600;
  line-height:1.3;
  margin-bottom:28px;
  padding-right:20px;
}
.lightbox-block{ margin-bottom:22px; }
.lightbox-block:last-child{ margin-bottom:0; }
.lightbox-block-label{
  display:block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:0.06em;
  text-transform:uppercase;
  color:var(--emerald-bright);
  margin-bottom:8px;
}
.lightbox-block p{
  font-size:14.5px;
  color:var(--text-muted);
  line-height:1.65;
}
.lightbox-metrics{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:14px;
}
.lightbox-metric-pill{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  color:var(--navy-950);
  background:linear-gradient(120deg,var(--gold-bright),var(--emerald-bright));
  padding:7px 13px;
  border-radius:999px;
}

@media (max-width:1024px){
  .case-page-grid{ grid-template-columns:repeat(2,1fr); }
}
@media (max-width:640px){
  .case-page-grid{ grid-template-columns:1fr; }
  .filter-tabs{ flex-direction:column; }
  .filter-tab-glider{ display:none; }
  .lightbox-panel{ padding:34px 24px; }
}