/*
 * Shared presentation shell for the reference exhibits.
 *
 * This is deliberately generic chrome only: page frame, panel layout,
 * control primitives, and the announcement strip. Every domain-specific
 * colour, texture, and scene style lives in the exhibit's own style.css.
 * Nothing here knows what an exhibit is about.
 */

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: "Segoe UI", Tahoma, Verdana, sans-serif;
  font-size: 14px;
  line-height: 1.45;
  background: #10131a;
  color: #e8ecf2;
  overflow: hidden;
}

.exhibit {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  grid-template-rows: auto minmax(0, 1fr) auto;
  grid-template-areas:
    "header header"
    "stage  panel"
    "footer footer";
  height: 100vh;
  gap: 10px;
  padding: 10px;
}

.exhibit-header {
  grid-area: header;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 14px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.exhibit-header h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.exhibit-header .subtitle {
  font-size: 12px;
  opacity: 0.6;
}

.exhibit-header .status {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.55;
}

.stage {
  grid-area: stage;
  position: relative;
  min-height: 0;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.stage canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.panel {
  grid-area: panel;
  min-height: 0;
  overflow-y: auto;
  padding: 12px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.panel h2 {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.55;
}

.panel section + section {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.control {
  margin-bottom: 12px;
}

.control:last-child { margin-bottom: 0; }

.control label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  font-size: 12px;
  margin-bottom: 5px;
  opacity: 0.85;
}

.control .readout {
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  opacity: 0.7;
}

input[type="range"] {
  width: 100%;
  accent-color: currentColor;
}

select {
  width: 100%;
  padding: 5px 6px;
  font: inherit;
  font-size: 12px;
  color: inherit;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 4px;
}

button {
  font: inherit;
  font-size: 12px;
  padding: 6px 10px;
  color: inherit;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 4px;
  cursor: pointer;
}

button:hover { background: rgba(255, 255, 255, 0.14); }
button:active { transform: translateY(1px); }

button[aria-pressed="true"] {
  background: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.4);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.button-row button { flex: 1 1 auto; }

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 12px;
}

.toggle-row:last-child { margin-bottom: 0; }

.exhibit-footer {
  grid-area: footer;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  min-height: 38px;
}

.exhibit-footer .announcement-label {
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.45;
  flex: 0 0 auto;
}

/* Announcement text is written with textContent only — never innerHTML. */
.exhibit-footer .announcement-text {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  opacity: 0.9;
}

.exhibit-footer .announcement-text.is-idle { opacity: 0.4; font-style: italic; }

@media (max-width: 900px) {
  .exhibit {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto minmax(0, 1fr) auto auto;
    grid-template-areas:
      "header"
      "stage"
      "panel"
      "footer";
    height: auto;
    min-height: 100vh;
  }
  .stage { min-height: 320px; }
  body { overflow: auto; }
}