/* =========================
   Lightbox: слои и блокировка прокрутки
   ========================= */

.page--problem-list .problem-card img {
  cursor: zoom-in;
}

html.photo-lightbox-lock {
  overscroll-behavior: none;
}

.photo-lightbox {
  position: fixed;
  inset: 0;
  z-index: var(--z-lightbox);
  display: block;
  width: 100vw;
  height: 100dvh;
  min-height: 100svh;
  background: color-mix(in srgb, #000000 18%, transparent);
  opacity: 0;
  cursor: zoom-out;
  backdrop-filter: blur(8px) saturate(0.9);
  touch-action: none;
}

/* Изображение позиционируется JS-ом через top/left/width/height:
   так получается анимация раскрытия из исходной карточки. */
.photo-lightbox__image {
  position: fixed;
  z-index: calc(var(--z-lightbox) + 1);
  max-width: none;
  max-height: none;
  margin: 0;
  border: 1px solid color-mix(in srgb, #ffffff 16%, transparent);
  background: var(--color-brand-subtle);
  box-shadow:
    0 28px 90px color-mix(in srgb, #000000 48%, transparent),
    0 0 0 1px color-mix(in srgb, #ffffff 8%, transparent);
  object-fit: contain;
  cursor: default;
  user-select: none;
  -webkit-user-drag: none;
  will-change: top, left, width, height, border-radius, opacity, transform;
}

/* Кнопки выше изображения и затемнения, чтобы оставаться кликабельными
   во время анимаций и переключения фотографий. */
.photo-lightbox__close,
.photo-lightbox__nav {
  position: fixed;
  z-index: var(--z-lightbox-controls);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid color-mix(in srgb, #ffffff 18%, transparent);
  background: color-mix(in srgb, #111111 46%, transparent);
  color: #ffffff;
  font-family: var(--font-heading);
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(10px);
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    opacity var(--transition-fast),
    transform var(--transition-fast);
}

.photo-lightbox__close {
  top: max(16px, calc(env(safe-area-inset-top) + 16px));
  right: max(16px, calc(env(safe-area-inset-right) + 16px));
  width: 46px;
  height: 46px;
  border-radius: 999px;
  font-size: 26px;
  font-weight: 600;
}

.photo-lightbox__nav {
  top: 50%;
  width: 54px;
  height: 72px;
  border-radius: var(--radius-pill);
  font-size: 38px;
  font-weight: 500;
  transform: translateY(-50%);
}

.photo-lightbox__nav--prev {
  left: max(16px, calc(env(safe-area-inset-left) + 16px));
}

.photo-lightbox__nav--next {
  right: max(16px, calc(env(safe-area-inset-right) + 16px));
}

.photo-lightbox__close:hover,
.photo-lightbox__nav:hover {
  border-color: color-mix(in srgb, #ffffff 34%, transparent);
  background: color-mix(in srgb, #111111 64%, transparent);
}

.photo-lightbox__close:hover {
  transform: scale(1.04);
}

.photo-lightbox__nav:hover {
  transform: translateY(-50%) scale(1.04);
}

.photo-lightbox__close:active {
  transform: scale(0.98);
}

.photo-lightbox__nav:active {
  transform: translateY(-50%) scale(0.98);
}

.photo-lightbox__close:focus-visible,
.photo-lightbox__nav:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-accent) 46%, transparent);
  outline-offset: 3px;
}

.photo-lightbox__nav[hidden] {
  display: none;
}

.photo-lightbox__counter {
  position: fixed;
  left: 50%;
  bottom: max(16px, calc(env(safe-area-inset-bottom) + 16px));
  z-index: var(--z-lightbox-controls);
  transform: translateX(-50%);
  padding: 8px 12px;
  border: 1px solid color-mix(in srgb, #ffffff 16%, transparent);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, #111111 46%, transparent);
  color: #ffffff;
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 800;
  line-height: 1;
  backdrop-filter: blur(10px);
}

/* =========================
   Адаптация lightbox
   ========================= */

@media (prefers-reduced-motion: reduce) {
  .photo-lightbox,
  .photo-lightbox__image {
    transition: none;
  }
}

@media (max-width: 700px) {
  .photo-lightbox__nav {
    width: 44px;
    height: 58px;
    font-size: 30px;
  }

  .photo-lightbox__nav--prev {
    left: max(12px, calc(env(safe-area-inset-left) + 12px));
  }

  .photo-lightbox__nav--next {
    right: max(12px, calc(env(safe-area-inset-right) + 12px));
  }
}

@media (max-width: 560px) {
  .photo-lightbox__close {
    width: 42px;
    height: 42px;
  }
}