/* Triptych — three images from the open archives.
   Study-room palette: mat-board gray, graphite ink, one stamp-red accent. */

:root {
  --bg: #e9e7e2;
  --mat: #f2f1ee;
  --ink: #26231f;
  --muted: #8b8579;
  --line: #d3cfc6;
  --accent: #a23c2c;
  --shadow: 0 1px 2px rgba(38, 35, 31, 0.16), 0 10px 28px -16px rgba(38, 35, 31, 0.35);
  --serif: "Iowan Old Style", Baskerville, "Palatino Linotype", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", "Helvetica Neue", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171614;
    --mat: #1f1e1b;
    --ink: #d9d5cc;
    --muted: #7c7669;
    --line: #2e2c27;
    --accent: #c9705a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 10px 28px -16px rgba(0, 0, 0, 0.7);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ---------- header ---------- */

.bar {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 22px 11px;
  border-bottom: 1px solid var(--line);
  flex: none;
}

.mark {
  font-family: var(--serif);
  font-variant: small-caps;
  letter-spacing: 0.14em;
  font-weight: 600;
  font-size: 16px;
  text-transform: lowercase;
}

.sub {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.bar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.about-toggle {
  font-family: var(--sans);
  font-size: 11px;
  color: var(--muted);
  background: none;
  border: none;
  border-bottom: 1px dotted var(--line);
  padding: 0 1px 1px;
  cursor: pointer;
}

.about-toggle:hover { color: var(--accent); border-bottom-color: var(--accent); }

.about {
  position: absolute;
  top: 52px;
  left: 22px;
  z-index: 5;
  max-width: min(48ch, calc(100vw - 44px));
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 18px 20px;
  box-shadow: 0 12px 32px -18px rgba(0, 0, 0, 0.4);
  font-size: 12px;
  line-height: 1.7;
}

.about p + p { margin-top: 10px; }

.about em { font-style: normal; letter-spacing: 0.04em; border-bottom: 1px solid var(--line); }

.about a { color: inherit; text-decoration-color: var(--accent); text-underline-offset: 3px; }

.about a:hover { color: var(--accent); }

.hint { font-size: 10px; color: var(--muted); }

kbd {
  font-family: var(--sans);
  font-size: 9px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 3px;
  padding: 1px 4px;
  color: var(--muted);
}

.action {
  font-family: var(--sans);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: none;
  border: 1px solid var(--line);
  padding: 6px 12px;
  cursor: pointer;
}

.action:hover { border-color: var(--accent); color: var(--accent); }

.nav {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 6px;
}

.nav:hover:not(:disabled) { color: var(--accent); }

.nav:disabled { opacity: 0.3; cursor: default; }

/* ---------- the three slots ---------- */

.row {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 16px 22px 14px;
}

.slot {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-height: 0;
  min-width: 0;
}

/* grid children default to min-width:auto, letting a wide image or an
   unwrappable caption inflate them past the column — pin them down */
.slot > * { min-width: 0; }

.frame img { min-width: 0; min-height: 0; }

.slot-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 7px;
}

.slot-controls {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  flex-wrap: wrap;
}

.cat-wrap { position: relative; display: inline-flex; align-items: center; }

.cat-wrap::after {
  content: "\25be";
  font-size: 8px;
  color: var(--muted);
  margin-left: 4px;
  pointer-events: none;
}

.sel {
  appearance: none;
  -webkit-appearance: none;
  font-family: var(--sans);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 0;
  text-overflow: ellipsis;
}

.sel:hover { color: var(--ink); }

/* the source select is the secondary control — a shade quieter */
.src { opacity: 0.75; }

.cat-measure {
  position: absolute;
  visibility: hidden;
  white-space: nowrap;
  pointer-events: none;
}

.reroll {
  font-size: 13px;
  line-height: 1;
  color: var(--muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
}

.rotate3d {
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--muted);
  background: none;
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 2px 5px;
  margin-right: 6px;
  cursor: pointer;
}

.rotate3d:hover { color: var(--accent); border-color: var(--accent); }

.rotate3d[aria-pressed="true"] {
  color: var(--accent);
  border-color: var(--accent);
}

.reroll:hover { color: var(--accent); }

.slot[data-state="loading"] .reroll {
  animation: spin 1.1s linear infinite;
  color: var(--accent);
}

@keyframes spin { to { transform: rotate(360deg); } }

/* the print on its mat */

.frame {
  position: relative;
  overflow: hidden; /* the zoom viewport */
  min-height: 0;
  background: var(--mat);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(10px, 1.6vw, 24px);
  text-decoration: none;
}

.slot[data-state="ready"] .frame img { cursor: zoom-in; }

.slot[data-zoomed="true"] .frame,
.slot[data-zoomed="true"] .frame img { cursor: grab; }

.slot[data-zoomed="true"] .frame:active,
.slot[data-zoomed="true"] .frame:active img { cursor: grabbing; }

.frame iframe.viewer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: #000;
}

.frame img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: var(--shadow);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.slot[data-state="ready"] .frame img { opacity: 1; }

.slot[data-state="loading"] .frame,
.slot[data-state="error"] .frame { pointer-events: none; }

.slot[data-state="error"] .frame img { display: none; }

.frame-msg {
  font-size: 11px;
  color: var(--muted);
  text-align: center;
  max-width: 22ch;
  line-height: 1.6;
}

/* accession label */

.label {
  padding-top: 9px;
  min-height: 52px;
}

.plate {
  font-size: 8.5px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--muted);
  padding-bottom: 3px;
}

.title {
  font-family: var(--serif);
  font-style: italic;
  font-size: 13.5px;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.title a { color: inherit; text-decoration: none; }

.title a[href]:hover {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.slot[data-state="loading"] .title,
.slot[data-state="error"] .title { color: var(--muted); }

.source {
  padding-top: 3px;
  font-size: 9.5px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.notice {
  grid-column: 1 / -1;
  align-self: center;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- states & a11y ---------- */

:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .frame img { transition: none; }
  .slot[data-state="loading"] .reroll { animation: none; }
}

/* ---------- small screens ---------- */

@media (max-width: 860px) {
  body { overflow: auto; height: auto; }
  .row { grid-template-columns: 1fr; }
  .frame { height: 62vh; }
  .sub { display: none; }
}

@media (max-height: 480px) {
  body { overflow: auto; height: auto; }
  .frame { min-height: 300px; }
}