.case-study {
  width: 100%;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: #1e293b;
  line-height: 1.6;
  box-sizing: border-box;
}

.case-heading {
  font-size: 1.7rem;
  font-weight: 700;
  margin: 0 0 1rem;
  color: #0f172a;
  letter-spacing: -0.02em;
}

.case-list {
  padding-left: 1.5rem;
  margin: 0 0 2rem;
  list-style-type: decimal;
  font-size: 1.05rem;
}

.case-list li {
  margin-bottom: 0.6rem;
}

.case-list li::marker {
  font-weight: 700;
  color: #2563eb;
}

/* Галерея */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 2.5rem;
}

.gallery-item {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 6px 18px rgba(0,0,0,0.07);
}

.gallery-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 30px rgba(0,0,0,0.13);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  color: white;
  font-size: 2rem;
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

/* Видео */
.case-videos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.video-wrapper {
  border-radius: 18px;
  overflow: hidden;
  background: #f1f5f9;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.video-wrapper video {
  width: 100%;
  display: block;
  background: #000;
}

/* Модальное окно */
.lightbox-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.lightbox-modal.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(6px);
}

.lightbox-content {
  position: relative;
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.lightbox-image {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  border-radius: 20px;
  box-shadow: 0 24px 48px rgba(0,0,0,0.4);
  transition: opacity 0.25s ease;
}

.lightbox-caption {
  margin-top: 1.2rem;
  color: #fff;
  font-size: 1rem;
  background: rgba(255,255,255,0.12);
  padding: 0.5rem 1.5rem;
  border-radius: 40px;
  backdrop-filter: blur(8px);
}

.lightbox-close {
  position: absolute;
  top: -20px;
  right: -20px;
  background: rgba(255,255,255,0.15);
  border: none;
  color: white;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
}

.lightbox-close:hover {
  background: rgba(255,255,255,0.3);
}

.lightbox-prev,
.lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.12);
  border: none;
  color: white;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  font-size: 2rem;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
}

.lightbox-prev:hover,
.lightbox-next:hover {
  background: rgba(255,255,255,0.3);
}

.lightbox-prev {
  left: 20px;
}

.lightbox-next {
  right: 20px;
}

@media (max-width: 640px) {
  .gallery-grid {
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  }
  .lightbox-prev,
  .lightbox-next {
    width: 38px;
    height: 38px;
    font-size: 1.5rem;
  }
}