/* About section: a circular three-card carousel with one dominant center card. */
.panel-about .feature-grid.about-carousel {
  position: relative;
  display: block;
  height: clamp(470px, 58vh, 540px);
  margin-top: clamp(24px, 3.4vh, 38px);
  overflow: visible;
  perspective: 1500px;
  transform-style: preserve-3d;
  touch-action: pan-y;
}

.panel-about .about-carousel .cyber-card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: clamp(360px, 31vw, 440px);
  height: clamp(440px, 54vh, 500px);
  min-height: 0;
  margin: 0;
  backface-visibility: hidden;
  cursor: pointer;
  transform-origin: center;
  will-change: transform, opacity, filter;
  transition:
    transform 820ms cubic-bezier(0.22, 0.72, 0.18, 1),
    opacity 620ms ease,
    filter 620ms ease,
    box-shadow 620ms ease;
}

.panel-about .about-carousel .cyber-card.is-about-active {
  z-index: 4;
  opacity: 1;
  filter: brightness(1.04) saturate(1.04);
  transform: translate3d(-50%, -50%, 60px) scale(1.065);
  box-shadow:
    inset 0 0 38px color-mix(in srgb, var(--accent) 11%, transparent),
    0 24px 52px rgba(0, 0, 0, 0.48),
    0 0 30px color-mix(in srgb, var(--accent) 24%, transparent);
}

.panel-about .about-carousel .cyber-card.is-about-prev {
  z-index: 2;
  opacity: 0.58;
  filter: brightness(0.68) saturate(0.72);
  transform: translate3d(-135%, -50%, -190px) rotateY(8deg) scale(0.82);
}

.panel-about .about-carousel .cyber-card.is-about-next {
  z-index: 2;
  opacity: 0.58;
  filter: brightness(0.68) saturate(0.72);
  transform: translate3d(35%, -50%, -190px) rotateY(-8deg) scale(0.82);
}

.panel-about .about-carousel .cyber-card.is-about-far {
  z-index: 1;
  opacity: 0;
  filter: brightness(0.45) saturate(0.5);
  pointer-events: none;
  transform: translate3d(-50%, -50%, -320px) scale(0.68);
}

.panel-about .about-carousel .cyber-card:not(.is-about-active) h3,
.panel-about .about-carousel .cyber-card:not(.is-about-active) p,
.panel-about .about-carousel .cyber-card:not(.is-about-active) .card-index {
  opacity: 0.7;
}

.panel-about .about-carousel .cyber-card.is-about-active .feature-card-media {
  filter: brightness(1.08) saturate(1.05) contrast(1.03);
}

.about-carousel-controls {
  position: relative;
  z-index: 8;
  display: flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin: clamp(10px, 1.7vh, 18px) auto 0;
}

.about-carousel-button,
.about-carousel-toggle,
.about-carousel-dot {
  border: 1px solid rgba(92, 236, 255, 0.58);
  background: rgba(4, 10, 21, 0.86);
  color: var(--cyan);
  cursor: pointer;
  box-shadow: inset 0 0 15px rgba(92, 236, 255, 0.08);
}

.about-carousel-button,
.about-carousel-toggle {
  display: grid;
  width: 44px;
  height: 42px;
  padding: 0;
  place-items: center;
  font-size: 20px;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

.about-carousel-button:hover,
.about-carousel-button:focus-visible,
.about-carousel-toggle:hover,
.about-carousel-toggle:focus-visible,
.about-carousel-dot:hover,
.about-carousel-dot:focus-visible {
  outline: none;
  border-color: #fff;
  color: #fff;
  box-shadow: inset 0 0 18px rgba(92, 236, 255, 0.16), 0 0 15px rgba(92, 236, 255, 0.26);
}

.about-carousel-dots {
  display: flex;
  align-items: center;
  gap: 8px;
}

.about-carousel-dot {
  width: 28px;
  height: 4px;
  padding: 0;
  border-width: 0;
  background: rgba(190, 203, 226, 0.3);
  transition: width 240ms ease, background 240ms ease, box-shadow 240ms ease;
}

.about-carousel-dot.is-active {
  width: 48px;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(92, 236, 255, 0.7);
}

.about-carousel-toggle {
  width: 38px;
  height: 34px;
  border-color: rgba(156, 50, 255, 0.52);
  color: #c99bff;
  font-size: 13px;
}

@media (max-width: 1199px) {
  .panel-about .feature-grid.about-carousel {
    width: min(100%, 760px);
    height: clamp(470px, 70vw, 560px);
    margin-right: auto;
    margin-left: auto;
    overflow: hidden;
  }

  .panel-about .about-carousel .cyber-card {
    width: min(72vw, 430px);
    height: clamp(430px, 64vw, 520px);
  }

  .panel-about .about-carousel .cyber-card.is-about-prev {
    opacity: 0.34;
    transform: translate3d(-128%, -50%, -180px) rotateY(7deg) scale(0.76);
  }

  .panel-about .about-carousel .cyber-card.is-about-next {
    opacity: 0.34;
    transform: translate3d(28%, -50%, -180px) rotateY(-7deg) scale(0.76);
  }
}

@media (max-width: 767px) {
  .panel-about .feature-grid.about-carousel {
    width: calc(100% + (var(--side) * 2));
    height: min(132vw, 540px);
    margin-right: calc(var(--side) * -1);
    margin-left: calc(var(--side) * -1);
  }

  .panel-about .about-carousel .cyber-card {
    width: min(86vw, 390px);
    height: min(122vw, 500px);
  }

  .panel-about .about-carousel .cyber-card.is-about-active {
    transform: translate3d(-50%, -50%, 36px) scale(1);
  }

  .panel-about .about-carousel .cyber-card.is-about-prev {
    opacity: 0.18;
    transform: translate3d(-143%, -50%, -180px) scale(0.72);
  }

  .panel-about .about-carousel .cyber-card.is-about-next {
    opacity: 0.18;
    transform: translate3d(43%, -50%, -180px) scale(0.72);
  }

  .about-carousel-controls {
    gap: 10px;
  }

  .about-carousel-button {
    width: 42px;
    height: 40px;
  }

  .about-carousel-dot {
    width: 18px;
  }

  .about-carousel-dot.is-active {
    width: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .panel-about .about-carousel .cyber-card,
  .about-carousel-dot {
    transition-duration: 0.01ms !important;
  }
}