/* ============================================================
   FACULTY SECTION — Breathing card showcase + lightbox
   ============================================================ */

.faculty-section {
  position: relative;
  z-index: 1;
  padding: 100px var(--space-xl) 110px;
  overflow: visible;         /* cards must pop outside section bounds */
}

/* Ambient glow blobs */
.faculty-section::before {
  content: '';
  position: absolute;
  top: -80px; right: -120px;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.09) 0%, transparent 65%);
  pointer-events: none;
}
.faculty-section::after {
  content: '';
  position: absolute;
  bottom: -60px; left: -100px;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 60, 220, 0.10) 0%, transparent 65%);
  pointer-events: none;
}

/* ── Section header ──────────────────────────────────────── */
.faculty-header { margin-bottom: 60px; }

/* ── Grid ────────────────────────────────────────────────── */
.faculty-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  /* overflow visible so elevated cards show above neighbours */
  overflow: visible;
}

/* ── Card ────────────────────────────────────────────────── */
.faculty-card {
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  aspect-ratio: 3 / 4;
  cursor: pointer;
  /* breathing animation vars — set via inline style */
  animation: facBreathe 12s ease-in-out infinite;
  animation-delay: var(--bd, 0s);
  /* ensure pointer events + z-index changes work */
  z-index: 1;
}

/* ── Breathing keyframe ──────────────────────────────────── */
/*
 * Each card "breathes" for 10% of the 12 s cycle (≈1.2 s),
 * then rests for the remaining 90 % while other cards take turns.
 * z-index jumps to 10 at 1 % so the enlarged card renders on top.
 */
@keyframes facBreathe {
  0%    {
    transform: scale(1) translateY(0);
    box-shadow: 0 4px 20px rgba(0,0,0,0.30);
    border-color: rgba(255,255,255,0.08);
    z-index: 1;
  }
  1%    { z-index: 10; }
  5%    {
    transform: scale(1.10) translateY(-12px);
    box-shadow:
      0 28px 64px rgba(0,0,0,0.60),
      0 0  40px rgba(0,229,255,0.28),
      0 0   0 2px rgba(0,229,255,0.50) inset;
    border-color: rgba(0,229,255,0.60);
  }
  9%    { z-index: 10; }
  10%   {
    transform: scale(1) translateY(0);
    box-shadow: 0 4px 20px rgba(0,0,0,0.30);
    border-color: rgba(255,255,255,0.08);
  }
  10.1% { z-index: 1; }
  100%  {
    transform: scale(1) translateY(0);
    box-shadow: 0 4px 20px rgba(0,0,0,0.30);
    border-color: rgba(255,255,255,0.08);
    z-index: 1;
  }
}

/* ── Card image ──────────────────────────────────────────── */
.faculty-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  pointer-events: none;
}

/* ── Click hint overlay — subtle, vanishes when hovered ──── */
.faculty-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(4, 10, 28, 0.55) 0%,
    transparent 45%
  );
  transition: opacity 0.3s ease;
}

/* Zoom icon hint at centre */
.faculty-card-overlay::after {
  content: '⤢';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.5rem;
  color: rgba(255,255,255,0);
  transition: color 0.25s ease;
}
.faculty-card:hover .faculty-card-overlay::after {
  color: rgba(255,255,255,0.70);
}

/* ── Faculty Lightbox ────────────────────────────────────── */
.faculty-lightbox {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}
.faculty-lightbox.open {
  opacity: 1;
  pointer-events: all;
}
.faculty-lightbox img {
  max-width: min(90vw, 600px);
  max-height: 90vh;
  border-radius: 20px;
  box-shadow: 0 40px 100px rgba(0,0,0,0.80), 0 0 0 1px rgba(0,229,255,0.20);
  object-fit: contain;
  display: block;
}
.faculty-lightbox-close {
  position: absolute;
  top: 20px; right: 24px;
  width: 42px; height: 42px;
  border-radius: 50%;
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.20);
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
.faculty-lightbox-close:hover { background: rgba(255,255,255,0.20); }

/* Prev / Next inside lightbox */
.fac-lb-prev, .fac-lb-next {
  position: absolute;
  top: 50%; transform: translateY(-50%);
  width: 48px; height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.20);
  color: #fff;
  font-size: 1.6rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
.fac-lb-prev { left: 20px;  }
.fac-lb-next { right: 20px; }
.fac-lb-prev:hover, .fac-lb-next:hover { background: rgba(0,229,255,0.20); }

/* ── Shimmer sweep — plays once when a card becomes active on mobile ── */
@keyframes facShimmer {
  from { transform: translateX(-160%) skewX(-18deg); }
  to   { transform: translateX(280%)  skewX(-18deg); }
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1200px) {
  .faculty-grid { grid-template-columns: repeat(4, 1fr); gap: 18px; }
}

@media (max-width: 900px) {
  .faculty-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .faculty-section { padding: 80px var(--space-xl) 90px; }
}

@media (max-width: 600px) {
  .faculty-section {
    padding: 60px 16px 70px;
    overflow: visible;
  }
  .faculty-header { margin-bottom: 36px; }

  /* 2 × 2 grid — exactly 4 slots visible */
  .faculty-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    overflow: visible;
  }

  /* Cards beyond first 4 are hidden — JS cycles images through the 4 slots */
  .faculty-grid .faculty-card:nth-child(n+5) { display: none; }

  /* Shimmer layer — hidden off left edge; card overflow:hidden clips it */
  .faculty-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
      105deg,
      transparent    0%,
      transparent   30%,
      rgba(255,255,255,0.18) 50%,
      rgba(0,229,255,0.10)   60%,
      transparent   80%
    );
    transform: translateX(-160%) skewX(-18deg);
    pointer-events: none;
    z-index: 5;
  }

  /* JS drives breathing — disable CSS keyframe, use transitions */
  .faculty-card {
    animation: none;
    transition: transform 0.5s cubic-bezier(0.34,1.56,0.64,1),
                box-shadow 0.5s ease,
                border-color 0.5s ease;
  }

  /* Active state: float up + cyan halo ring */
  .faculty-card.fac-breathe-active {
    transform: translateY(-16px);
    box-shadow:
      0 24px 56px rgba(0,0,0,0.65),
      0 0   60px rgba(0,229,255,0.38),
      0 0    0 2px rgba(0,229,255,0.60) inset;
    border-color: rgba(0,229,255,0.85);
    z-index: 10;
  }

  /* Trigger shimmer sweep on the active card */
  .faculty-card.fac-breathe-active::after {
    animation: facShimmer 0.75s ease forwards;
  }
}

/* Pause breathing when user prefers reduced motion */
@media (prefers-reduced-motion: reduce) {
  .faculty-card { animation: none !important; }
}