/* ============================================
   PAPERBOY — 3D Carousel
   Full-bleed, edge-to-edge, minimal topic cards
   ============================================ */

/* ── Scene Container (full-width) ────────── */
.carousel-scene {
  width: 100vw;
  margin-left: calc(-50vw + 50%);
  overflow: hidden;
  perspective: 35em;
  mask: linear-gradient(90deg, #0000, #000 8% 92%, #0000);
  -webkit-mask: linear-gradient(90deg, #0000, #000 8% 92%, #0000);
  padding: var(--sp-2xl) 0;
  min-height: 400px;
  display: grid;
  transform: scale(1.2);
}

/* ── 3D Ring ──────────────────────────────── */
.carousel-ring {
  display: grid;
  place-self: center;
  transform-style: preserve-3d;
  animation: carousel-rotate 48s linear infinite;
}

.carousel-ring:hover {
  animation-play-state: paused;
}

@keyframes carousel-rotate {
  to {
    rotate: y 1turn;
  }
}

/* ── Topic Cards ─────────────────────────── */
.topic-card {
  --w: 22em;
  --ba: 1turn / var(--n);

  grid-area: 1 / 1;
  width: var(--w);
  aspect-ratio: 3 / 4;
  border-radius: var(--radius-lg);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform-style: preserve-3d;
  transform:
    rotatey(calc(var(--i) * var(--ba))) translatez(calc(-1 * (.5 * var(--w) + 0.75em) / tan(.5 * var(--ba))));

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-sm);
  padding: 0;
  cursor: pointer;
  user-select: none;
  position: relative;

  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: var(--shadow-sm);
  overflow: hidden;

  transition:
    box-shadow var(--dur-normal) var(--ease-smooth),
    border-color var(--dur-normal) var(--ease-smooth),
    background var(--dur-normal) var(--ease-smooth),
    opacity var(--dur-normal) var(--ease-smooth);
}

.topic-card__image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  opacity: 1;
  transition: opacity var(--dur-normal) var(--ease-smooth), transform var(--dur-normal) var(--ease-smooth);
}

.topic-card:hover .topic-card__image {
  opacity: 0.6;
  transform: scale(1.05);
}

.topic-card__icon {
  display: none;
}

.topic-card__icon,
.topic-card__icon svg {
  width: 14px;
  height: 14px;
}

.topic-card__check,
.topic-card__check svg {
  width: 22px;
  height: 22px;
}

.topic-card__label {
  position: relative;
  z-index: 1;
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 2rem;
  text-align: center;
  color: white;
  line-height: var(--lh-tight);
  max-width: 80%;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin: var(--sp-md) auto;
  padding: 0 var(--sp-sm);
  transition: color var(--dur-normal) var(--ease-smooth);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.topic-card__check {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-circle);
  background: var(--clr-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.65rem;
  opacity: 0;
  transform: scale(0);
  transition: all var(--dur-normal) var(--ease-bounce);
}

/* ── Card States ─────────────────────────── */
.topic-card:hover:not(.topic-card--disabled) {
  box-shadow: var(--shadow-md);
  border-color: var(--clr-border-focus);
}

.topic-card:hover:not(.topic-card--disabled) .topic-card__icon {
  transform: scale(1.08);
}

.topic-card--selected {
  background: rgba(59, 89, 152, 0.04);
  border-color: var(--clr-primary);
  box-shadow: var(--shadow-glow);
}

.topic-card--selected .topic-card__check {
  opacity: 1;
  transform: scale(1);
}

.topic-card--selected .topic-card__label {
  color: var(--clr-primary);
  font-weight: var(--fw-semibold);
}

.topic-card--disabled {
  opacity: 0.3;
  cursor: not-allowed;
  filter: grayscale(0.6);
}

.topic-card--disabled:hover {
  box-shadow: var(--shadow-sm);
  border-color: rgba(0, 0, 0, 0.06);
}

/* ── Responsive ──────────────────────────── */
@media (max-width: 1023px) {
  .topic-card {
    --w: 12em;
  }

  .carousel-scene {
    min-height: 340px;
  }
}

@media (max-width: 767px) {
  .topic-card {
    --w: 9em;
  }

  .carousel-scene {
    min-height: 280px;
    perspective: 26em;
  }

  .topic-card__icon {
    font-size: 1.8rem;
  }

  .topic-card__label {
    font-size: 0.6rem;
  }
}

/* ── Reduced Motion ──────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .carousel-ring {
    animation-duration: 200s;
  }
}