/* Loops: widening and narrowing */

:where(.scene-loop) .ticks line {
  stroke: var(--border-strong);
  stroke-width: 1.5;
}

:where(.scene-loop) .axis-head {
  fill: var(--border-strong);
}

:where(.scene-loop) .ticks text {
  fill: var(--text-muted);
  font-size: 12px;
  text-anchor: middle;
}

:where(.scene-loop) .loop-layout {
  display: grid;
  grid-template-columns: minmax(240px, 0.38fr) minmax(0, 1fr);
  align-items: center;
  gap: 28px;
}

:where(.scene-loop) .loop-code {
  padding: 16px 0;
  color: var(--editor-text);
  background: var(--surface-dark);
  border: 1px solid var(--editor-border);
  border-radius: 10px;
  font: 0.92rem / 2 var(--mono);
}

:where(.scene-loop) .lc {
  display: block;
  padding: 0 16px;
  white-space: pre;
  transition: background 250ms ease;
}

.scene-loop[data-step="0"] .lc-1,
.scene-loop[data-step="1"] .lc-3,
.scene-loop[data-step="2"] .lc-3,
.scene-loop[data-step="4"] .lc-2,
.scene-loop[data-step="5"] .lc-4 {
  background: rgb(94 164 178 / 0.32);
}

.scene-loop[data-step="3"] .lc-2 {
  background: rgb(215 102 66 / 0.35);
}

.scene-loop[data-step="6"] .lc-5 {
  background: rgb(111 207 151 / 0.32);
}

:where(.scene-loop) .loop-visual svg {
  max-width: 720px;
  margin-inline: 0;
}

:where(.scene-loop) .loop-captions {
  min-height: 2.2em;
  margin-bottom: 8px;
}

:where(.scene-loop) .loop-captions p {
  display: none;
  margin: 0;
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 650;
}

:where(.scene-loop) .loop-captions p.accent {
  color: var(--accent-hover);
}

:where(.scene-loop) .loop-captions p.good {
  color: var(--success);
}

.scene-loop[data-step="0"] [data-for="0"],
.scene-loop[data-step="1"] [data-for="1"],
.scene-loop[data-step="2"] [data-for="2"],
.scene-loop[data-step="3"] [data-for="3"],
.scene-loop[data-step="4"] [data-for="4"],
.scene-loop[data-step="5"] [data-for="5"],
.scene-loop[data-step="6"] [data-for="6"] {
  display: block;
  animation: caption-in 350ms ease;
}

/* The bar spans 0..+inf at scale 1; one unit is 50 of its 480 user units. */
:where(.scene-loop) .loop-bar {
  fill: var(--primary);
  transform-box: fill-box;
  transform-origin: 0 50%;
  transition:
    transform 600ms cubic-bezier(0.3, 0.7, 0.2, 1),
    fill 300ms ease;
}

.scene-loop[data-step="0"] .loop-bar {
  transform: translateX(-3px) scaleX(0.0125);
}

.scene-loop[data-step="1"] .loop-bar {
  transform: scaleX(0.1042);
}

.scene-loop[data-step="2"] .loop-bar {
  transform: scaleX(0.2083);
}

/* Steps 1 and 2 are not stored values: the equation's result, and the step plain
   iteration would take. Outlined so they do not read as the solver's state. */
.scene-loop:is([data-step="1"], [data-step="2"]) .loop-bar {
  fill: transparent;
  stroke: var(--primary);
  stroke-width: 2px;
  stroke-dasharray: 6 4;
  vector-effect: non-scaling-stroke;
}

:where(.scene-loop) .loop-chips button.ghost {
  border-style: dashed;
}

.scene-loop[data-step="3"] .loop-bar {
  transform: scaleX(1);
  fill: var(--accent);
}

.scene-loop[data-step="4"] .loop-bar {
  transform: scaleX(0.5208);
}

.scene-loop[data-step="5"] .loop-bar {
  transform: translateX(247px) scaleX(0.0125);
}

.scene-loop[data-step="6"] .loop-bar {
  transform: translateX(247px) scaleX(0.0125);
  fill: var(--success);
}

:where(.scene-loop) .loop-chips button.widen[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
}

@media (max-width: 820px) {
  :where(.scene-loop) .loop-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}