.lightbox {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  background: rgba(0, 0, 0, 0.88);
}

.lightbox[hidden] {
  display: none;
}

.lightbox-media {
  position: relative;
  display: grid;
  place-items: center;
  min-width: min(96vw, 320px);
  min-height: min(78vh, 320px);
}

.lightbox img {
  max-width: min(96vw, 1600px);
  max-height: 92vh;
  object-fit: contain;
  transition: opacity 160ms ease;
}

.lightbox img.is-pending {
  opacity: 0;
}

.lightbox img.is-loading {
  opacity: 0.18;
}

.lightbox img.is-error {
  opacity: 0.08;
}

.lightbox-loading {
  position: absolute;
  inset: auto 50% 50%;
  transform: translate(-50%, 50%);
  display: grid;
  gap: 0.55rem;
  width: min(280px, calc(100vw - 48px));
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(17, 19, 23, 0.88);
  backdrop-filter: blur(6px);
}

.lightbox-loading[hidden] {
  display: none;
}

.lightbox-loading-bar {
  position: relative;
  height: 4px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(214, 222, 232, 0.12);
}

.lightbox-loading-bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 -40%;
  width: 40%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  animation: lightbox-loading-slide 1s ease-in-out infinite;
}

.lightbox-loading.is-error .lightbox-loading-bar {
  background: rgba(232, 104, 104, 0.18);
}

.lightbox-loading.is-error .lightbox-loading-bar::after {
  inset: 0;
  width: auto;
  background: rgba(232, 104, 104, 0.72);
  animation: none;
}

.lightbox-loading.is-error .lightbox-loading-text {
  color: #f2b1b1;
}

.lightbox-loading-text {
  color: var(--muted);
  font-size: 0.84rem;
  text-align: center;
}

@keyframes image-tile-skeleton {
  from { background-position: 100% 0; }
  to { background-position: -100% 0; }
}

@keyframes image-tile-loading-slide {
  from { left: -40%; }
  to { left: 100%; }
}

@keyframes lightbox-loading-slide {
  from { left: -40%; }
  to { left: 100%; }
}

.icon-btn,
.nav-btn {
  position: fixed;
  z-index: 90;
  display: grid;
  place-items: center;
  border: 1px solid rgba(214, 222, 232, 0.14);
  background: rgba(17, 19, 23, 0.84);
  backdrop-filter: blur(10px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
}

.icon-btn {
  top: 8px;
  min-width: 34px;
  min-height: 34px;
  font-size: 1.05rem;
}

.lightbox-favorite {
  right: 48px;
  border-color: rgba(230, 180, 80, 0.42);
  color: var(--muted);
}

.lightbox-download {
  right: 128px;
  border-color: rgba(214, 222, 232, 0.3);
  background: rgba(25, 30, 37, 0.92);
  color: var(--text);
  font-size: 1.18rem;
  font-weight: 700;
}

.lightbox-seen {
  right: 88px;
  border-color: rgba(95, 183, 178, 0.42);
  color: var(--muted);
}

#close-lightbox {
  right: 8px;
  font-size: 1.2rem;
}

.lightbox-favorite.is-favorite {
  color: var(--accent);
  border-color: rgba(230, 180, 80, 0.78);
}

.lightbox-seen.is-seen {
  color: var(--accent-2);
  border-color: rgba(95, 183, 178, 0.78);
}

.lightbox-download:disabled,
.lightbox-favorite:disabled {
  opacity: 0.45;
}

.lightbox-seen:disabled {
  opacity: 0.45;
}

.nav-btn {
  top: 50%;
  transform: translateY(-50%);
  width: 34px;
  height: 52px;
  font-size: 1.45rem;
  border-radius: 8px;
}

.nav-btn.prev { left: 8px; }
.nav-btn.next { right: 8px; }

.icon-btn:hover,
.nav-btn:hover {
  background: rgba(34, 40, 49, 0.94);
  border-color: rgba(230, 180, 80, 0.34);
}

.icon-btn:disabled,
.nav-btn:disabled {
  opacity: 0.34;
  cursor: not-allowed;
}

.nav-btn:disabled:hover {
  background: rgba(17, 19, 23, 0.84);
  border-color: rgba(214, 222, 232, 0.14);
}

.caption {
  position: fixed;
  left: 50%;
  bottom: 8px;
  transform: translateX(-50%);
  max-width: min(860px, calc(100vw - 20px));
  padding: 0.38rem 0.6rem;
  border-radius: 8px;
  border: 1px solid rgba(214, 222, 232, 0.12);
  background: rgba(17, 19, 23, 0.84);
  color: var(--muted);
  font-size: 0.76rem;
  text-align: center;
  backdrop-filter: blur(10px);
}