.accordion-gallery {
  display: flex;
  width: 100%;
  height: 480px;
  gap: 16px;
  margin: 40px 0;
  border-radius: var(--radius-lg, 16px);
  overflow: hidden;
  position: relative;
}

.accordion-item {
  position: relative;
  flex: 1;
  height: 100%;
  border-radius: var(--radius-lg, 16px);
  overflow: hidden;
  cursor: pointer;
  transition: flex 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.3s ease, border-color 0.3s ease;
  border: 1px solid var(--border-glass, rgba(255, 255, 255, 0.1));
  background: var(--bg-card, rgba(15, 23, 42, 0.75));
}

.accordion-item.active {
  flex: 3.5;
  border-color: var(--border-glow, rgba(0, 240, 255, 0.35));
  box-shadow: 0 10px 30px rgba(0, 102, 255, 0.25), 0 0 20px rgba(0, 240, 255, 0.2);
}

.accordion-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  filter: grayscale(75%) brightness(0.55);
  transition: filter 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s ease;
}

.accordion-item.active .accordion-bg {
  filter: grayscale(0%) brightness(0.85);
  transform: scale(1.03);
}

.accordion-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(3, 7, 18, 0.1) 0%, rgba(3, 7, 18, 0.92) 100%);
  pointer-events: none;
}

.accordion-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 28px;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: opacity 0.3s ease;
}

.accordion-number {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent-cyan, #00F0FF);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.accordion-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main, #FFFFFF);
  margin: 0;
  white-space: nowrap;
  letter-spacing: -0.5px;
}

.accordion-subtitle {
  font-size: 0.95rem;
  color: var(--text-sub, #94A3B8);
  margin: 0;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.4s ease 0.1s, max-height 0.4s ease;
  line-height: 1.6;
}

.accordion-item.active .accordion-subtitle {
  opacity: 1;
  max-height: 100px;
}

@media (max-width: 900px) {
  .accordion-gallery {
    flex-direction: column;
    height: 640px;
    gap: 12px;
  }

  .accordion-item.active {
    flex: 3;
  }

  .accordion-title {
    font-size: 1.25rem;
  }

  .accordion-content {
    padding: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .accordion-item, .accordion-bg, .accordion-subtitle {
    transition: none !important;
  }
}