:root {
  --color-bg: #0a0a0a;
  --color-fg: #f2f2f2;
  --color-fg-muted: rgba(242, 242, 242, 0.65);
  --color-overlay: rgba(0, 0, 0, 0.55);
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
}

body {
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-sans);
}

.viewer {
  position: relative;
  width: 100vw;
  height: 100dvh;
  overflow: hidden;
}

.viewer__stage {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.viewer__stage img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  user-select: none;
  -webkit-user-drag: none;
}

.viewer__empty {
  color: var(--color-fg-muted);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  text-align: center;
  padding: 0 1.5rem;
}

.viewer__nav {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 3.5rem;
  display: flex;
  align-items: center;
  color: var(--color-fg);
  opacity: 0.45;
  transition: opacity 0.15s ease;
}

.viewer__nav:hover,
.viewer__nav:focus-visible {
  opacity: 0.9;
}

.viewer__nav svg {
  width: 1.5rem;
  height: 1.5rem;
}

.viewer__nav--prev {
  left: 0;
  padding-left: max(0.75rem, var(--safe-left));
  justify-content: flex-start;
}

.viewer__nav--next {
  right: 0;
  padding-right: max(0.75rem, var(--safe-right));
  justify-content: flex-end;
}

.viewer__footer {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding: 2.5rem 1rem 1rem;
  padding-left: max(1rem, var(--safe-left));
  padding-right: max(1rem, var(--safe-right));
  padding-bottom: max(1rem, var(--safe-bottom));
  background: linear-gradient(to top, var(--color-overlay), transparent);
  pointer-events: none;
}

.viewer__caption {
  font-size: 0.85rem;
  color: var(--color-fg-muted);
  max-width: 70ch;
}

.viewer__index {
  font-size: 0.8rem;
  color: var(--color-fg-muted);
  white-space: nowrap;
}

@media (max-width: 32rem) {
  .viewer__nav {
    width: 2.75rem;
  }

  .viewer__caption {
    font-size: 0.78rem;
  }
}