/* ── Viewer ("viewing room") ─────────────────────────────────────────────
   Native <dialog>, full-bleed on the wall colour. The drawing gets the screen;
   chrome is a handful of small solid chips that fade out after a moment of
   inactivity. Tokens only - no hard-coded colours. */

.viewer {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  background: var(--color-bg);
  color: var(--color-text-primary);
  overflow: hidden;
}
.viewer:not([open]) {
  display: none;
}
.viewer::backdrop {
  background: var(--color-bg);
}

/* Everything lives in this root so fullscreen (which browsers refuse on a
   <dialog>) keeps chrome, caption and toasts inside it. */
.viewer-root {
  position: absolute;
  inset: 0;
  background: var(--color-bg);
}

.viewer-stage {
  position: absolute;
  inset: 0;
  /* the "mat" around the work + notch/home-indicator safe areas */
  padding:
    max(1rem, env(safe-area-inset-top))
    max(1rem, env(safe-area-inset-right))
    max(1rem, env(safe-area-inset-bottom))
    max(1rem, env(safe-area-inset-left));
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.viewer-media {
  position: relative;
  width: 100%;
  height: 100%;
  transform-origin: center center;
  will-change: transform;
}
.viewer.is-zoomed .viewer-stage {
  cursor: grab;
}

.viewer-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.viewer-img[hidden] {
  display: none;
}
.viewer-img--thumb {
  opacity: 0.85;
}

.viewer-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}
.viewer-loading[hidden] {
  display: none;
}

.viewer-error {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 2rem;
  text-align: center;
}
.viewer-error[hidden] {
  display: none;
}

/* ── Video ──────────────────────────────────────────────────────────────── */
.viewer-video-host,
.viewer-video-facade {
  position: absolute;
  inset: max(1rem, env(safe-area-inset-top)) max(1rem, env(safe-area-inset-right))
         max(1rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
}
.viewer-video-facade[hidden] {
  display: none;
}
.viewer-video {
  width: 100%;
  height: 100%;
  border: 0;
  background: var(--color-surface);
}
.viewer-play {
  position: absolute;
  top: 50%;
  left: 50%;
  translate: -50% -50%;
  width: 4.5rem;
  height: 4.5rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text-primary);
  cursor: pointer;
}
.viewer-play:hover {
  background: var(--color-accent);
  color: var(--color-accent-text);
}

/* ── Chrome ─────────────────────────────────────────────────────────────── */
.viewer-chrome {
  transition: opacity var(--transition-speed);
}
.viewer.chrome-hidden .viewer-chrome {
  opacity: 0;
  pointer-events: none;
}
.viewer.chrome-hidden .viewer-stage {
  cursor: none;
}

.viewer-btn {
  display: inline-grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text-primary);
  cursor: pointer;
}
.viewer-btn:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-text);
}
.viewer-btn:disabled,
.viewer-edge:disabled {
  opacity: 0.35;
  cursor: default;
  pointer-events: none;
}
.viewer-btn[aria-pressed="true"],
.viewer-btn[aria-expanded="true"] {
  border-color: var(--color-accent);
}

.viewer-bar {
  position: absolute;
  top: max(0.75rem, env(safe-area-inset-top));
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.viewer-bar--start { left: max(0.75rem, env(safe-area-inset-left)); }
.viewer-bar--end   { right: max(0.75rem, env(safe-area-inset-right)); }

.viewer-position {
  padding: 0 0.6rem;
  height: 2.75rem;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--color-border-subtle);
  background: var(--color-bg);
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}
.viewer-position:empty {
  display: none;
}

.viewer-bar--end .wall-switch {
  padding: 0 0.6rem;
  height: 2.75rem;
  border: 1px solid var(--color-border-subtle);
  background: var(--color-bg);
}

/* Edge navigation zones: full-height, narrow, arrow chip centred */
.viewer-edge {
  position: absolute;
  top: 0;
  bottom: 0;
  width: clamp(3.5rem, 12vw, 7rem);
  display: flex;
  align-items: center;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--color-text-primary);
  cursor: pointer;
}
.viewer-edge--prev { left: 0;  justify-content: flex-start; padding-left: max(0.5rem, env(safe-area-inset-left)); }
.viewer-edge--next { right: 0; justify-content: flex-end;   padding-right: max(0.5rem, env(safe-area-inset-right)); }
.viewer-edge:hover .viewer-btn {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-text);
}
/* Touch: swipe replaces the zones; keep the chips small and out of the way. */
@media (pointer: coarse) {
  .viewer-edge {
    width: 3.5rem;
    pointer-events: none;
  }
  .viewer-edge .viewer-btn {
    pointer-events: auto;
  }
}

.viewer-caption {
  position: absolute;
  left: max(0.75rem, env(safe-area-inset-left));
  bottom: max(0.75rem, env(safe-area-inset-bottom));
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  max-width: calc(100% - 7rem);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-border-subtle);
  background: var(--color-bg);
}
.viewer-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.viewer-title:focus-visible {
  outline-offset: 4px;
}
.viewer-year {
  flex-shrink: 0;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}
.viewer-year:empty {
  display: none;
}

/* ── Details panel ──────────────────────────────────────────────────────── */
.viewer-info {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(24rem, 100%);
  padding: 1.25rem 1.25rem max(1.25rem, env(safe-area-inset-bottom));
  overflow-y: auto;
  background: var(--color-bg);
  border-left: 1px solid var(--color-border);
  z-index: 2;
}
.viewer-info[hidden] {
  display: none;
}
.viewer-info__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
.viewer-info__header h2 {
  font-size: 1.25rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.viewer-meta {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}
.viewer-meta dt {
  color: var(--color-text-muted);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.viewer-meta dd {
  color: var(--color-text-primary);
  font-size: 0.9rem;
}
.viewer-desc {
  margin-bottom: 1.25rem;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Narrow screens: details become a bottom sheet over the lower part of the work */
@media (max-width: 700px) {
  .viewer-info {
    top: auto;
    left: 0;
    width: 100%;
    max-height: 60%;
    border-left: 0;
    border-top: 1px solid var(--color-border);
  }
  .viewer-caption {
    max-width: calc(100% - 1.5rem);
  }
  .viewer-bar--end .wall-switch {
    display: none;
  }
}

@media (min-width: 701px) {
  /* keep the control bar clear of the open details panel */
  .viewer.info-open .viewer-bar--end {
    right: calc(min(24rem, 100%) + 0.75rem);
  }
}