.course-image-lightbox {
  position: fixed;
  inset: 0;
  z-index: 1085;
  display: grid;
  place-items: center;
  padding: 28px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .16s ease;
}

.course-image-lightbox.is-open {
  opacity: 1;
  pointer-events: auto;
}

.course-image-lightbox__backdrop {
  position: absolute;
  inset: 0;
  padding: 0;
  border: 0;
  background: rgba(8, 10, 18, .78);
  backdrop-filter: blur(10px);
}

.course-image-lightbox__dialog {
  position: relative;
  display: grid;
  place-items: center;
  max-width: min(88vw, 920px);
  max-height: 82vh;
  padding: 34px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 24px;
  background: rgba(20, 23, 36, .92);
  box-shadow: 0 32px 90px rgba(0,0,0,.48);
  transform: scale(.96);
  transition: transform .16s ease;
}

.course-image-lightbox.is-open .course-image-lightbox__dialog {
  transform: scale(1);
}

.course-image-lightbox__dialog img {
  max-width: 100%;
  max-height: calc(82vh - 56px);
  object-fit: contain;
}

.course-image-lightbox__close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 999px;
  color: #fff;
  background: rgba(0,0,0,.34);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.course-image-lightbox__close:hover,
.course-image-lightbox__close:focus-visible {
  border-color: rgba(255,255,255,.34);
  background: rgba(255,255,255,.12);
}

.course-image-lightbox__close:focus-visible {
  outline: 2px solid var(--site-accent-on-dark);
  outline-offset: 3px;
}

@media (max-width: 768px) {
  .course-image-lightbox {
    padding: 16px;
  }

  .course-image-lightbox__dialog {
    max-width: 94vw;
    padding: 22px;
    border-radius: 20px;
  }
}