/* =====================
   3D Product Carousel
===================== */

.product-carousel-section {
  padding-top: 4rem;
  padding-bottom: 4rem;
  background: var(--background);
  overflow: hidden;
}

.product-carousel-section .carousel-3d__subtitle {
  max-width: 760px;
  margin: 1rem auto 0;
  color: var(--gray-600);
}

.carousel-3d {
  --carousel-radius: 400px;
  --carousel-card-w: 200px;
  --carousel-card-h: 260px;
  --carousel-stage-h: 440px;
  position: relative;
  max-width: 1100px;
  margin: 2.5rem auto 0;
  outline: none;
}

@media (hover: hover) and (pointer: fine) {
  .carousel-3d.is-drift-prev::before,
  .carousel-3d.is-drift-next::after {
    opacity: 1;
  }

  .carousel-3d::before,
  .carousel-3d::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 3.5rem;
    width: 22%;
    max-width: 140px;
    z-index: 5;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.35s ease;
  }

  .carousel-3d::before {
    left: 0;
    background: linear-gradient(90deg, rgba(0, 142, 201, 0.07), transparent);
  }

  .carousel-3d::after {
    right: 0;
    background: linear-gradient(270deg, rgba(0, 142, 201, 0.07), transparent);
  }
}

.carousel-3d__stage {
  position: relative;
  height: var(--carousel-stage-h);
  perspective: 1400px;
  perspective-origin: 50% 42%;
  transform-style: preserve-3d;
  touch-action: pan-y;
  cursor: grab;
  user-select: none;
  overflow: hidden;
}

.carousel-3d.is-dragging .carousel-3d__stage {
  cursor: grabbing;
}

.carousel-3d.is-dragging .carousel-3d__ring,
.carousel-3d.is-drifting .carousel-3d__ring {
  transition: none;
}

.carousel-3d__ring {
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--carousel-card-w);
  height: var(--carousel-card-h);
  margin-left: calc(var(--carousel-card-w) / -2);
  margin-top: calc(var(--carousel-card-h) / -2);
  transform-style: preserve-3d;
  transform: translateZ(calc(var(--carousel-radius) * -1)) rotateY(var(--carousel-rot, 0deg));
  transition: transform 0.85s cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: transform;
}

.carousel-3d__card {
  position: absolute;
  inset: 0;
  margin: auto;
  width: var(--carousel-card-w);
  height: var(--carousel-card-h);
  transform-style: preserve-3d;
  transform: rotateY(calc(var(--carousel-i) * (360deg / var(--carousel-count))))
    translateZ(var(--carousel-radius));
  backface-visibility: hidden;
  transition: opacity 0.5s ease, filter 0.5s ease;
  opacity: 0.45;
  pointer-events: none;
}

.carousel-3d__card.is-front {
  opacity: 1;
  pointer-events: auto;
  z-index: 3;
}

.carousel-3d__card.is-adjacent {
  opacity: 0.42;
  z-index: 2;
}

.carousel-3d__card.is-adjacent .carousel-3d__card-link {
  transform: scale(0.92);
}

.carousel-3d__card-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform 0.45s cubic-bezier(0.22, 0.61, 0.36, 1),
    box-shadow 0.45s ease,
    border-color 0.45s ease;
}

.carousel-3d__card.is-front .carousel-3d__card-link {
  transform: scale(1.06);
  border-color: var(--primary-blue);
  box-shadow: 0 16px 40px rgba(0, 142, 201, 0.22), var(--shadow-lg);
}

.carousel-3d__card-link:hover {
  border-color: var(--primary-blue);
}

/* Desktop: hover any visible tile + slight scale-up */
@media (hover: hover) and (pointer: fine) and (min-width: 769px) {
  .carousel-3d__card {
    pointer-events: auto;
  }

  .carousel-3d__card:not(.is-front):not(.is-adjacent) .carousel-3d__card-link {
    transform: scale(0.88);
  }

  .carousel-3d__card:hover {
    z-index: 4;
  }

  .carousel-3d__card:hover .carousel-3d__card-link {
    border-color: var(--primary-blue);
    box-shadow: 0 12px 32px rgba(0, 142, 201, 0.18), var(--shadow-lg);
  }

  .carousel-3d__card.is-front:hover .carousel-3d__card-link {
    transform: scale(1.1);
  }

  .carousel-3d__card.is-adjacent:hover .carousel-3d__card-link {
    transform: scale(0.98);
    opacity: 1;
  }

  .carousel-3d__card:not(.is-front):not(.is-adjacent):hover .carousel-3d__card-link {
    transform: scale(0.94);
  }

  .carousel-3d__card:hover .carousel-3d__card-photo img {
    transform: scale(1.04);
  }
}

.carousel-3d__card-photo {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 1rem 0.5rem;
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--surface) 100%);
  min-height: 0;
}

[data-theme="dark"] .carousel-3d__card-photo {
  background: linear-gradient(180deg, var(--gray-100) 0%, var(--surface) 100%);
}

.carousel-3d__card-photo img {
  width: 100%;
  max-height: 150px;
  object-fit: contain;
  transition: transform 0.45s ease;
}

.carousel-3d__card.is-front .carousel-3d__card-photo img {
  transform: scale(1.03);
}

.carousel-3d__card-body {
  padding: 0.75rem 1rem 1rem;
  text-align: center;
  border-top: 1px solid var(--gray-100);
}

.carousel-3d__card-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 0 0 0.35rem;
  line-height: 1.3;
}

.carousel-3d__card-code {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--primary-blue);
  background: rgba(0, 142, 201, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.carousel-3d__floor {
  position: absolute;
  left: 50%;
  bottom: 8%;
  width: min(520px, 70%);
  height: 48px;
  margin-left: -35%;
  background: radial-gradient(
    ellipse at center,
    rgba(0, 44, 53, 0.18) 0%,
    rgba(0, 44, 53, 0.06) 45%,
    transparent 70%
  );
  transform: rotateX(75deg);
  pointer-events: none;
}

[data-theme="dark"] .carousel-3d__floor {
  background: radial-gradient(
    ellipse at center,
    rgba(0, 142, 201, 0.25) 0%,
    rgba(0, 142, 201, 0.08) 45%,
    transparent 70%
  );
}

.carousel-3d__nav {
  position: absolute;
  top: 50%;
  z-index: 10;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--gray-200);
  border-radius: 50%;
  background: var(--surface);
  color: var(--gray-800);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: background var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast), transform var(--transition-fast);
}

.carousel-3d__nav:hover {
  background: var(--primary-blue);
  border-color: var(--primary-blue);
  color: white;
  transform: translateY(-50%) scale(1.05);
}

.carousel-3d__nav:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

.carousel-3d__nav i {
  font-size: 1.25rem;
}

.carousel-3d__nav--prev {
  left: 0;
}

.carousel-3d__nav--next {
  right: 0;
}

.carousel-3d__dots {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
}

.carousel-3d__dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--gray-300);
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.carousel-3d__dot:hover {
  background: var(--gray-500);
  transform: scale(1.15);
}

.carousel-3d__dot.is-active {
  background: var(--primary-blue);
  transform: scale(1.2);
}

.carousel-3d__dot:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

@media (max-width: 1024px) {
  .carousel-3d {
    --carousel-radius: 320px;
    --carousel-card-w: 170px;
    --carousel-card-h: 230px;
    --carousel-stage-h: 380px;
    padding: 0 2.5rem;
  }

  .carousel-3d__nav--prev {
    left: 0.25rem;
  }

  .carousel-3d__nav--next {
    right: 0.25rem;
  }
}

@media (max-width: 768px) {
  .product-carousel-section {
    padding-top: 3rem;
    padding-bottom: 3rem;
  }

  .carousel-3d {
    /* radius tuned by JS; fallback = tight ring without overlap */
    --carousel-radius: 198px;
    --carousel-card-w: 128px;
    --carousel-card-h: 196px;
    --carousel-stage-h: 300px;
    padding: 0 2.25rem;
    margin-top: 1.5rem;
  }

  .carousel-3d__stage {
    perspective: 1100px;
    perspective-origin: 50% 44%;
  }

  .carousel-3d__card:not(.is-front):not(.is-adjacent) {
    opacity: 0.28;
  }

  .carousel-3d__card:not(.is-front):not(.is-adjacent) .carousel-3d__card-link {
    transform: scale(0.86);
  }

  .carousel-3d__card.is-front .carousel-3d__card-link {
    transform: scale(1.02);
  }

  .carousel-3d__card-photo img {
    max-height: 100px;
  }

  .carousel-3d__card-title {
    font-size: 0.8125rem;
  }

  .carousel-3d__nav {
    width: 36px;
    height: 36px;
  }
}

@media (max-width: 480px) {
  .carousel-3d {
    --carousel-radius: 172px;
    --carousel-card-w: 108px;
    --carousel-card-h: 168px;
    --carousel-stage-h: 268px;
    padding: 0 2rem;
  }

  .carousel-3d__stage {
    perspective: 900px;
  }

  .carousel-3d__card:not(.is-front) .carousel-3d__card-link {
    transform: scale(0.88);
  }

  .carousel-3d__card-photo {
    padding: 0.5rem 0.5rem 0.25rem;
  }

  .carousel-3d__card-photo img {
    max-height: 82px;
  }

  .carousel-3d__card-body {
    padding: 0.5rem 0.625rem 0.625rem;
  }

  .carousel-3d__card-title {
    font-size: 0.75rem;
  }

  .carousel-3d__card-code {
    font-size: 0.6875rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .carousel-3d__ring {
    transition-duration: 0.01ms;
  }

  .carousel-3d__card,
  .carousel-3d__card-link,
  .carousel-3d__card-photo img {
    transition-duration: 0.01ms;
  }
}