/* Interactive 3D mesh viewer (js/mesh-anim.js). Loaded only on pages that
   embed a {{mesh...}} directive, alongside the script itself; relies on the
   custom properties defined in main.css, which every page loads first. */

.mesh-anim {
  position: relative;
  border: 1px solid var(--color-border-muted);
  border-radius: 6px;
  background: var(--color-surface);
  overflow: hidden;
}

.mesh-anim-canvas {
  display: block;
  width: 100%;
  /* Reserved by aspect-ratio so loading the blob causes no layout shift. */
  aspect-ratio: 4 / 3;
  touch-action: none;
  cursor: grab;
}

.mesh-anim-canvas:active {
  cursor: grabbing;
}

.mesh-anim-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 0.6rem;
  border-top: 1px solid var(--color-border-muted);
  background: var(--color-surface-2);
}

/* A static shape with no scalar fields has nothing to put in the bar. The
   viewer removes it once the blob is parsed; this hides it until then. */
.mesh-anim-controls:empty {
  display: none;
}

/* All three kinds of button in the bar share one look. */
.mesh-anim-play,
.mesh-anim-field,
.mesh-anim-full {
  font: inherit;
  color: var(--color-text);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  cursor: pointer;
}

.mesh-anim-play:hover:not(:disabled),
.mesh-anim-field:hover,
.mesh-anim-full:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.mesh-anim-play {
  flex: 0 0 auto;
  min-width: 4.2rem;
  padding: 0.2rem 0.5rem;
  font-size: 0.85rem;
}

.mesh-anim-play:disabled {
  color: var(--color-text-muted);
  cursor: default;
}

.mesh-anim-slider {
  flex: 1 1 auto;
  min-width: 0;
  accent-color: var(--color-accent);
}

/* Which scalar field the surface is coloured by; 'Shape' turns colouring off.
   Sits at the right of the bar so it does not push the transport around. */
.mesh-anim-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-left: auto;
}

.mesh-anim-field {
  padding: 0.15rem 0.45rem;
  font-size: 0.8rem;
}

/* After the shared :hover rule, so the active button stays inverted. */
.mesh-anim-field.is-active {
  color: #fff;
  background: var(--color-accent);
  border-color: var(--color-accent);
}

/* Icon-only, so it costs almost nothing next to the field buttons. */
.mesh-anim-full {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  padding: 0.2rem 0.4rem;
  color: var(--color-text-muted);
}

/* Colour bar for the active field, labelled with its range. */
.mesh-anim-legend {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.6rem 0.1rem;
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  color: var(--color-text-muted);
}

/* display:flex above would otherwise defeat the hidden attribute. */
.mesh-anim-legend[hidden] {
  display: none;
}

.mesh-anim-legend-bar {
  flex: 1 1 auto;
  height: 0.5rem;
  border-radius: 2px;
  border: 1px solid var(--color-border-muted);
}

/* Understated cue that the mesh is interactive, over the top-left of the canvas.
   Fades on the first gesture, or by itself after a few seconds. */
.mesh-anim-hint {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.72rem;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.72);
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.4s ease;
}

.mesh-anim-hint.is-gone {
  opacity: 0;
}

/* Full screen. Driven by a class the viewer toggles from the fullscreenchange
   event rather than :fullscreen, so one rule covers the vendor-prefixed API too.
   The canvas gives up its fixed aspect ratio and takes whatever is left over
   once the legend and the bar have had their share. */
.mesh-anim.is-fullscreen {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  border: 0;
  border-radius: 0;
  background: var(--color-surface);
}

/* Fallback for browsers that refuse element fullscreen (iPhone Safari): pin the
   viewer over the page instead. Uses dvh so the iOS toolbars cannot clip it. */
.mesh-anim.is-pinned {
  position: fixed;
  inset: 0;
  z-index: 60;
  width: 100vw;
  height: 100dvh;
}

body.mesh-anim-pinned {
  overflow: hidden;
}

.mesh-anim.is-fullscreen .mesh-anim-canvas {
  flex: 1 1 auto;
  aspect-ratio: auto;
  min-height: 0;
  height: auto;
}

.mesh-anim-status {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  pointer-events: none;
}

/* A row of static shapes read across, from {{mesh_row, ...}}. Squarer than a
   lone viewer so a narrow column still frames the whole shape, and captions
   are aligned with each other rather than with the bottom of the row. */
.mesh-row {
  align-items: start;
}

.mesh-row .mesh-anim-canvas {
  aspect-ratio: 1 / 1;
}