/* vs-card — depthfield shelf CARD face (HOUSE-RESERVED)
   Spec: docs/ops/2026-08-02-HANDS-OBJECTS-MASTER-SPEC.md §4
   One engine, CARD face: media front · receipt back · paper edges = thickness. */

.vs-shelf {
  --vs-night-0: #0b0f1a;
  --vs-night-1: #111726;
  --vs-paper-0: #e9e6dd;
  --vs-paper-1: #cfccc2;
  --vs-glow: rgba(127, 216, 232, 0.28);
  --vs-accent: #7fd8e8;
  background: linear-gradient(165deg, var(--vs-night-0), var(--vs-night-1));
  color: #e8e6e0;
  padding: clamp(2.5rem, 6vw, 4.5rem) 1.25rem;
  position: relative;
  overflow: hidden;
}

.vs-shelf h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  font-weight: 650;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
  max-width: 28ch;
}
.vs-shelf h2 em {
  font-style: normal;
  color: var(--vs-accent);
}
.vs-shelf .vs-lead {
  max-width: 56ch;
  opacity: 0.72;
  font-size: 0.95rem;
  line-height: 1.55;
  margin: 0 0 1.75rem;
}

.vs-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  perspective: 1400px;
}

.vs-slot {
  width: 330px;
  height: 230px;
  position: relative;
}
/* light under the door — sanctioned night glow */
.vs-slot::before {
  content: "";
  position: absolute;
  left: 10%;
  right: 10%;
  bottom: -8px;
  height: 28px;
  background: radial-gradient(50% 100% at 50% 0%, var(--vs-glow), transparent 70%);
  filter: blur(6px);
  pointer-events: none;
  z-index: 0;
}

.vs-card3d {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  animation: vs-spin 18s linear infinite;
  z-index: 1;
}
.vs-slot:nth-child(2) .vs-card3d { animation-delay: -6s; }
.vs-slot:nth-child(3) .vs-card3d { animation-delay: -12s; }
.vs-slot:hover .vs-card3d,
.vs-slot:focus-within .vs-card3d {
  animation-play-state: paused;
}

.vs-card3d.is-flip {
  animation: none;
  transition: transform 700ms cubic-bezier(0.32, 0.72, 0, 1);
  transform: rotateY(180deg) rotateX(8deg);
}

.vs-face,
.vs-edge {
  position: absolute;
  inset: 0;
  border-radius: 14px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border: 1px solid rgba(255, 255, 255, 0.14);
  overflow: hidden;
}
.vs-face-front {
  transform: translateZ(9px);
  background: #141820;
  display: grid;
  place-items: center;
}
.vs-face-back {
  transform: rotateY(180deg) translateZ(9px);
  background: #171b24;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12.5px;
  line-height: 1.4;
}
.vs-face-back strong {
  font-size: 14px;
  font-weight: 650;
}
.vs-face-back .vs-rowmeta {
  opacity: 0.65;
  font-size: 11.5px;
}
.vs-face-back .vs-actions {
  margin-top: auto;
  display: flex;
  gap: 8px;
}
.vs-face-back .vs-actions a,
.vs-face-back .vs-actions button {
  font: inherit;
  font-size: 11px;
  font-weight: 650;
  color: var(--vs-accent);
  background: transparent;
  border: 1px solid rgba(127, 216, 232, 0.35);
  border-radius: 6px;
  padding: 5px 9px;
  cursor: pointer;
  text-decoration: none;
}

/* thickness proof */
.vs-edge-l,
.vs-edge-r {
  width: 18px;
  height: 100%;
  left: 50%;
  margin-left: -9px;
  background: linear-gradient(180deg, var(--vs-paper-0), var(--vs-paper-1));
  border: none;
}
.vs-edge-l { transform: rotateY(90deg) translateZ(165px); }
.vs-edge-r { transform: rotateY(-90deg) translateZ(165px); }

.vs-face-front img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.vs-face-front .vs-tag {
  position: absolute;
  left: 10px;
  bottom: 10px;
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  padding: 3px 7px;
  border-radius: 4px;
}

@keyframes vs-spin {
  from { transform: rotateY(0deg) rotateX(6deg); }
  to { transform: rotateY(360deg) rotateX(6deg); }
}

@media (prefers-reduced-motion: reduce) {
  .vs-card3d {
    animation: none;
    transform: rotateY(32deg) rotateX(6deg);
  }
  .vs-slot:nth-child(2) .vs-card3d { transform: rotateY(-28deg) rotateX(6deg); }
  .vs-slot:nth-child(3) .vs-card3d { transform: rotateY(148deg) rotateX(6deg); }
  .vs-card3d.is-flip { transform: rotateY(180deg) rotateX(6deg); transition: none; }
}