/* Overlays (DESIGN.md §15): the DOM parts of the overlay layer — literature labels and their
   hover card. Rulers, trends, curves, the lasso and the mosaic are drawn on the #overlay and
   #tiles canvases (js/view/overlays/). */

/* full-stage layer inside #stage-ui that never takes pointer events itself */
#stage-ui > .ov-layer {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

/* tiny literature label at a curve end (mustard, mono) with a swatch of the curve's line
   style; hover shows name + citation. Width = text + 6 px padding + 13 px swatch (SWATCH_W in
   js/view/overlays/literature.js). */
.ov-layer .ov-lit {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  gap: 3px;
  height: 14px;
  padding: 0 3px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 14px;
  letter-spacing: 0.05em;
  white-space: nowrap;
  color: var(--mustard);
  background: rgba(11, 14, 19, 0.6);
  text-decoration: none;
  pointer-events: auto;
  cursor: pointer;
  will-change: transform;
  transition: background-color var(--t-ui) var(--ease-ui), color var(--t-ui) var(--ease-ui), box-shadow var(--t-ui) var(--ease-ui);
}
.ov-layer .ov-lit .ov-sw {
  flex: none;
  width: 10px;
  height: 6px;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.3;
}
.ov-layer .ov-lit:hover,
.ov-layer .ov-lit:focus-visible {
  color: #f4d27a;
  background: rgba(226, 178, 58, 0.14);
  box-shadow: 0 0 0 1px rgba(226, 178, 58, 0.5);
  outline: none;
}

/* hover card: double-rule frame, name in Jost, citation in mono */
.ov-layer .ov-tip {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  max-width: min(320px, calc(100% - 16px));
  padding: 8px 11px 9px;
  border: 1px solid var(--hair-25);
  border-radius: var(--r-sm);
  outline: 1px solid var(--hair-15);
  outline-offset: 2px;
  background: var(--bg-2);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.5);
  color: var(--cream);
  pointer-events: none;
}
.ov-layer .ov-tip[hidden] { display: none; }
.ov-layer .ov-tip-name {
  font-family: var(--font-ui);
  font-size: 12.5px;
  line-height: 1.3;
}
.ov-layer .ov-tip-cite {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.45;
  color: var(--cream-2);
}

.ov-layer .ov-tip-off {
  margin-top: 5px;
  padding-top: 5px;
  border-top: 1px solid var(--hair-15);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--mustard);
}

@media (prefers-reduced-motion: reduce) {
  .ov-layer .ov-lit { transition: none; }
}