/* Slide animations, ported from slides/styles.css.
   Each scene is laid out on the slide's fixed 1132px-wide content box (height --h), then scaled to
   the container width by animations.js (--s). Steps are cumulative .step-N classes. */

.anim-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 1132 / var(--h, 590);
  overflow: hidden;
}

.anim-canvas {
  position: absolute;
  left: 0;
  top: 0;
  width: 1132px;
  height: calc(var(--h, 590) * 1px);
  transform: scale(var(--s, 1));
  transform-origin: 0 0;
  color: var(--ink);
  font-family: Helvetica, Arial, sans-serif;
  font-size: 42px;
  font-weight: normal;
  line-height: 1.3;
  text-align: left;
}

/* reveal.js defaults the scenes were designed against */
.anim-canvas img {
  max-width: 95%;
  max-height: 95%;
  height: auto;
  margin: 20px 0;
}

/* ---------- Encoder probing ---------- */

.anim-canvas .encoder-scene {
  position: relative;
  height: 585px;
}

.anim-canvas .image-panel {
  position: absolute;
  display: grid;
  justify-items: center;
  color: var(--muted);
  font-size: 35px;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.anim-canvas .image-panel img {
  width: 250px;
  height: 250px;
  object-fit: contain;
}

.anim-canvas .image-panel span {
  transform: translateY(-28px);
}

.anim-canvas .in-panel {
  left: 24px;
  top: 56px;
}

.anim-canvas .out-panel {
  right: 82px;
  top: 56px;
}

.anim-canvas .mesh-panel {
  left: 380px;
  top: 305px;
}

.anim-canvas .mesh-panel img {
  width: 250px;
}

.anim-canvas .mesh-panel span {
  transform: translateX(260px) translateY(-88px);
}

.anim-canvas .encoder-title {
  position: absolute;
  top: 0;
  left: 338px;
  width: 400px;
  text-align: center;
  font-size: 30px;
  font-weight: 800;
  opacity: 0;
  transition: opacity 420ms ease;
}

.anim-canvas .encoder-title span {
  display: block;
  color: var(--muted);
  font-size: 25px;
  font-weight: 500;
  margin-top: 4px;
}

.anim-canvas .blocks {
  position: absolute;
  left: 350px;
  top: 85px;
  display: flex;
  gap: 54px;
}

.anim-canvas .enc-block {
  display: grid;
  justify-items: center;
  gap: 10px;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.anim-canvas .block-box {
  display: block;
  width: 88px;
  height: 166px;
  border-radius: 10px;
  background: #EEF3F7;
  position: relative;
}

.anim-canvas .token-stack {
  position: absolute;
  left: 31px;
  top: 10px;
  display: grid;
  gap: 6px;
  opacity: 0;
  transition: opacity 420ms ease;
}

.anim-canvas .token-stack i {
  display: block;
  width: 25px;
  height: 25px;
  border-radius: 6px;
}

.anim-canvas .purple-tokens i { background: var(--purple); }
.anim-canvas .mixed-tokens i { background: #5280CF; }
.anim-canvas .green-tokens i { background: var(--green); }
.anim-canvas .token-stack i:nth-child(1) { opacity: 0.92; }
.anim-canvas .token-stack i:nth-child(2) { opacity: 0.84; }
.anim-canvas .token-stack i:nth-child(3) { opacity: 0.76; }
.anim-canvas .token-stack i:nth-child(4) { opacity: 0.68; }
.anim-canvas .token-stack i:nth-child(5) { opacity: 0.6; }

.anim-canvas .enc-block span {
  color: var(--ink);
  font-size: 20px;
  font-weight: 700;
}

.anim-canvas .encoder-lines {
  position: absolute;
  left: -50px;
  top: -60px;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.anim-canvas .encoder-lines marker path { fill: var(--ink); }
.anim-canvas #probe-arrow path { fill: var(--purple); }

.anim-canvas .flow {
  stroke: var(--ink);
  stroke-width: 2.4;
  marker-end: url(#encoder-arrow);
  opacity: 0;
  transition: opacity 420ms ease;
}

.anim-canvas .probe {
  fill: none;
  stroke: var(--purple);
  stroke-width: 2.8;
  marker-end: url(#probe-arrow);
  opacity: 0;
  transition: opacity 420ms ease;
}

.anim-canvas .encoder.step-0 .in-panel {
  opacity: 1;
  transform: translateY(0);
}

.anim-canvas .encoder.step-1 .encoder-title,
.anim-canvas .encoder.step-1 .enc-block,
.anim-canvas .encoder.step-1 .flow,
.anim-canvas .encoder.step-1 .token-stack,
.anim-canvas .encoder.step-1 .out-panel {
  opacity: 1;
  transform: translateY(0);
}

.anim-canvas .encoder.step-2 .mesh-panel,
.anim-canvas .encoder.step-2 .probe {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Persistent homology filtration ---------- */

.anim-canvas .ph-wrap {
  height: 590px;
}

.anim-canvas .ph-scene {
  width: 100%;
  height: 100%;
}

.anim-canvas .dot {
  fill: var(--yellow);
  stroke: white;
  stroke-width: 3;
}

.anim-canvas .ball {
  fill: rgba(42, 157, 143, 0.12);
  stroke: var(--green);
  stroke-width: 4;
  transition: r 520ms ease;
}

.anim-canvas .edge {
  stroke: #264653;
  stroke-width: 7;
  opacity: 0;
  transition: opacity 420ms ease;
}

.anim-canvas .tri {
  fill: rgba(231, 111, 81, 0.2);
  opacity: 0;
  transition: opacity 420ms ease;
}

.anim-canvas .axis {
  stroke: var(--ink);
  stroke-width: 3;
}

.anim-canvas .guide {
  stroke: var(--grid);
  stroke-width: 2;
  stroke-dasharray: 8 8;
}

.anim-canvas .caption {
  fill: var(--ink);
  font-size: 26px;
  font-weight: 700;
}

.anim-canvas .cloud-caption {
  fill: var(--muted);
  font-size: 34px;
  font-weight: 700;
  text-anchor: middle;
}

.anim-canvas .filtration-label {
  fill: var(--ink);
  font-size: 48px;
  font-weight: 800;
  text-anchor: middle;
}

.anim-canvas .diagram-axis {
  fill: var(--muted);
  font-size: 20px;
  font-weight: 700;
  text-anchor: middle;
}

.anim-canvas .axis-label {
  fill: var(--green);
  font-size: 23px;
  font-weight: 800;
}

.anim-canvas .axis-label.h1 { fill: var(--orange); }

.anim-canvas .bar {
  stroke-width: 10;
  stroke-linecap: round;
  transition: x2 520ms ease, opacity 250ms ease;
}

.anim-canvas .bar.h0 { stroke: var(--green); }

.anim-canvas .h1bar {
  stroke: var(--orange);
  opacity: 0;
}

.anim-canvas .sweep {
  stroke: var(--yellow);
  stroke-width: 4;
  transition: transform 520ms ease;
}

.anim-canvas .diagram {
  opacity: 0;
  transition: opacity 420ms ease;
}

.anim-canvas .diag {
  stroke: var(--grid);
  stroke-width: 3;
  stroke-dasharray: 8 7;
}

.anim-canvas .pd.h0 { fill: var(--green); }
.anim-canvas .pd.h1 { fill: var(--orange); }
.anim-canvas .diagram .pd { opacity: 0; }

.anim-canvas .bar-to-diagram .morph-dot {
  opacity: 0;
  transition: opacity 260ms ease, transform 900ms cubic-bezier(0.25, 0.9, 0.25, 1);
}

.anim-canvas .bar-to-diagram .h0 { fill: var(--green); }
.anim-canvas .bar-to-diagram .h1 { fill: var(--orange); }

.anim-canvas .callout {
  fill: var(--muted);
  font-size: 22px;
}

.anim-canvas .ph-salient-annotation line {
  stroke: var(--orange);
  stroke-width: 8;
  stroke-linecap: round;
  marker-end: url(#ph-salient-arrow);
}

.anim-canvas .ph-salient-annotation text {
  fill: var(--orange);
  font-size: 23px;
  font-weight: 800;
}

.anim-canvas #ph-salient-arrow path { fill: var(--orange); }

.anim-canvas .ph.step-1 .edge.e45,
.anim-canvas .ph.step-1 .edge.e51,
.anim-canvas .ph.step-2 .edge.e34,
.anim-canvas .ph.step-3 .edge.e12,
.anim-canvas .ph.step-4 .edge.e23,
.anim-canvas .ph.step-4 .b5,
.anim-canvas .ph.step-5 .edge.e14,
.anim-canvas .ph.step-5 .tri-3,
.anim-canvas .ph.step-6 .edge.e35,
.anim-canvas .ph.step-6 .edge.e25,
.anim-canvas .ph.step-6 .edge.e13,
.anim-canvas .ph.step-6 .tri-1,
.anim-canvas .ph.step-6 .tri-4,
.anim-canvas .ph.step-6 .tri-5,
.anim-canvas .ph.step-6 .bar-to-diagram .morph-dot {
  opacity: 1;
}

.anim-canvas .ph.step-5 .ph-complex,
.anim-canvas .ph.step-6 .ph-complex {
  transform: translate(55px, 0);
}

.anim-canvas .ph.step-7 .barcode { opacity: 0; }

.anim-canvas .ph.step-7 .ph-complex {
  transform: translate(5px, 45px) scale(0.75);
  transform-origin: 260px 300px;
}

.anim-canvas .ph.step-7 .diagram { opacity: 1; }
.anim-canvas .ph.step-7 .bar-to-diagram .m1 { transform: translate(-128px, 118px); }
.anim-canvas .ph.step-7 .bar-to-diagram .m2 { transform: translate(-128px, 88px); }
.anim-canvas .ph.step-7 .bar-to-diagram .m3 { transform: translate(-171px, 31px); }
.anim-canvas .ph.step-7 .bar-to-diagram .m4 { transform: translate(-205px, -25px); }
.anim-canvas .ph.step-7 .bar-to-diagram .m5 { transform: translate(-99px, -171px); }

.anim-canvas .ph-complex,
.anim-canvas .barcode,
.anim-canvas .diagram {
  transition: opacity 420ms ease, transform 520ms ease;
}

/* ---------- CKA feature-space alignment ---------- */

.anim-canvas .cka-scene {
  position: relative;
  height: 585px;
}

.anim-canvas .cka-source,
.anim-canvas .cka-action,
.anim-canvas .tokens,
.anim-canvas .plane-img,
.anim-canvas .token-dot,
.anim-canvas .cka-arrows,
.anim-canvas .cka-label,
.anim-canvas .aligned-spaces {
  position: absolute;
  opacity: 0;
  transition: opacity 420ms ease, transform 520ms ease;
}

.anim-canvas .cka-source img {
  width: 170px;
  height: 170px;
  object-fit: contain;
}

.anim-canvas .cka-source span {
  position: absolute;
  top: -32px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--muted);
  font-size: 23px;
  font-weight: 700;
  white-space: nowrap;
}

.anim-canvas .cka-source.point {
  left: 210px;
  top: 28px;
}

.anim-canvas .diag-mini {
  right: 225px;
  top: 44px;
}

.anim-canvas .diag-mini svg {
  width: 180px;
  height: 150px;
}

.anim-canvas .diag-mini line {
  stroke: var(--ink);
  stroke-width: 4;
}

.anim-canvas .diag-mini circle { fill: var(--purple); }

.anim-canvas .tokens {
  display: flex;
  gap: 7px;
  transform-origin: center;
}

.anim-canvas .tokens i {
  width: 24px;
  height: 24px;
  border-radius: 5px;
  background: var(--purple);
  transition: border-radius 520ms ease;
}

.anim-canvas .cka-action {
  color: var(--ink);
  font-size: 22px;
  font-weight: 700;
}

.anim-canvas .encode-label { left: 82px; top: 218px; }
.anim-canvas .vectorize-label { right: 55px; top: 218px; }
.anim-canvas .tok-left,
.anim-canvas .tok-left-ghost { left: 180px; top: 220px; }
.anim-canvas .tok-right,
.anim-canvas .tok-right-ghost { right: 165px; top: 220px; }

.anim-canvas .plane-img {
  object-fit: contain;
  pointer-events: none;
}

.anim-canvas .left-plane { left: 192px; top: 240px; width: 210px; }
.anim-canvas .right-plane { right: 220px; top: 232px; width: 220px; }

.anim-canvas .token-dot {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  z-index: 4;
  transition: opacity 420ms ease, left 650ms ease, right 650ms ease, top 650ms ease;
}

.anim-canvas .left-dot { left: 292px; top: 256px; background: var(--purple); }
.anim-canvas .right-dot { right: 285px; top: 256px; background: var(--green); }

.anim-canvas .cka-arrows {
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.anim-canvas .cka-arrows path {
  fill: none;
  stroke: var(--ink);
  stroke-width: 3.2;
  stroke-linecap: round;
}

.anim-canvas .cka-head { fill: var(--ink); }

.anim-canvas .cka-label {
  left: 810px;
  top: 480px;
  width: 280px;
  font-size: 30px;
  line-height: 1.12;
  font-weight: 800;
}

.anim-canvas .aligned-spaces {
  left: 320px;
  top: 370px;
  width: 540px;
  height: 250px;
}

.anim-canvas .aligned-spaces img {
  position: absolute;
  opacity: 1;
  object-fit: contain;
  pointer-events: none;
}

.anim-canvas .aligned-left {
  left: 48px;
  top: 32px;
  width: 460px;
  opacity: 0.62 !important;
}

.anim-canvas .aligned-right {
  left: 34px;
  top: 18px;
  width: 460px;
  opacity: 0.55 !important;
  transform: rotate(5deg);
}

.anim-canvas .cka.step-0 .cka-source { opacity: 1; }

.anim-canvas .cka.step-1 .tokens,
.anim-canvas .cka.step-1 .cka-action {
  opacity: 1;
  transform: translateY(0);
}

.anim-canvas .cka.step-1 .token-ghost { opacity: 0; }

.anim-canvas .cka.step-2 .plane-img,
.anim-canvas .cka.step-2 .token-dot {
  opacity: 1;
}

.anim-canvas .cka.step-2 .plane-img { transition-delay: 720ms; }

.anim-canvas .cka.step-2 .token-dot {
  transition: opacity 250ms ease, left 650ms ease 720ms, right 650ms ease 720ms, top 650ms ease 720ms;
}

.anim-canvas .cka.step-2 .token-ghost { opacity: 0.22; }

.anim-canvas .cka.step-2 .tok-left {
  opacity: 0;
  transform: translate(0, 32px) scale(0.08);
}

.anim-canvas .cka.step-2 .tok-right {
  opacity: 0;
  transform: translate(-7px, 32px) scale(0.08);
}

.anim-canvas .cka.step-2 .tok-left i,
.anim-canvas .cka.step-2 .tok-right i {
  border-radius: 50%;
}

.anim-canvas .cka.step-2 .left-dot,
.anim-canvas .cka.step-2 .right-dot {
  top: 336px;
}

.anim-canvas .cka.step-3 .cka-label,
.anim-canvas .cka.step-3 .aligned-spaces,
.anim-canvas .cka.step-3 .cka-arrows {
  opacity: 1;
}

/* ---------- Player controls ---------- */

.anim-controls {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-top: 0.75rem;
}

.anim-play {
  flex: none;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  background: white;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.anim-play:hover {
  border-color: var(--purple);
  color: var(--purple);
}

.anim-play svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

.anim-play .icon-play,
.anim[data-playing] .anim-play .icon-pause {
  display: block;
}

.anim-play .icon-pause,
.anim[data-playing] .anim-play .icon-play {
  display: none;
}

.anim-progress {
  flex: 1;
  display: flex;
  gap: 5px;
}

.anim-progress button {
  flex: 1;
  height: 18px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

.anim-progress button::before {
  content: "";
  display: block;
  height: 4px;
  border-radius: 2px;
  background: var(--border-color);
  transition: background 0.3s;
}

.anim-progress button.is-done::before { background: #C9C1FF; }
.anim-progress button.is-active::before { background: var(--purple); }
.anim-progress button:hover::before { background: var(--purple); }

.anim-captions {
  display: grid;
  margin: 0.6rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.55;
}

/* Captions share one grid cell so the box keeps the height of the longest one */
.anim-captions li {
  grid-area: 1 / 1;
  margin: 0;
  opacity: 0;
  transition: opacity 0.35s ease;
}

.anim-captions li.is-active { opacity: 1; }

.anim-captions .step-num {
  margin-right: 0.4rem;
  color: var(--purple);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}