html[data-prototype-focus="transition-lab"]
  .landing-view
  > :not([data-checkpoint="12"]) {
  display: none;
}

.transition-lab {
  --t-progress: 0;
  --t-intro-opacity: 1;
  --t-intro-y: 0vh;
  --t-intro-scale: 1;
  --t-particle-opacity: 1;
  --t-photo-opacity: 0;
  --t-copy-opacity: 0;
  --t-copy-y: 0.8rem;
  --t-aperture: 50%;
  --t-image-scale: 1.18;
  --t-card-y: 64vh;
  --t-card-left-x: -18vw;
  --t-card-right-x: 18vw;
  --t-card-left-rotate: -8deg;
  --t-card-right-rotate: 8deg;
  --t-gold-clip: polygon(0 0, 0 0, 0 100%, 0 100%);
  --t-silver-clip: polygon(100% 0, 100% 0, 100% 100%, 100% 100%);
  --t-lens-width: 12vmin;
  --t-lens-height: 12vmin;
  --t-lens-radius: 50%;
  position: relative;
  height: 330vh;
  height: 330svh;
  background: #fff;
  color: #111;
}

.transition-stage {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100svh;
  overflow: hidden;
  background: #fff;
  isolation: isolate;
}

.transition-particles {
  position: absolute;
  z-index: 3;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  opacity: var(--t-particle-opacity);
  pointer-events: none;
  will-change: opacity, transform;
}

.transition-intro {
  position: absolute;
  z-index: 4;
  inset: 0;
  display: grid;
  align-content: center;
  justify-items: center;
  padding: clamp(7rem, 15vh, 10rem) var(--header-gutter) clamp(4rem, 8vh, 6rem);
  opacity: var(--t-intro-opacity);
  pointer-events: none;
  transform: translate3d(0, var(--t-intro-y), 0) scale(var(--t-intro-scale));
  transform-origin: center;
  will-change: opacity, transform;
}

.transition-kicker,
.transition-particle-source,
.transition-scroll-cue,
.transition-product figcaption,
.transition-proof-label,
.transition-guide {
  margin: 0;
}

.transition-kicker {
  position: absolute;
  top: clamp(8.7rem, 22vh, 11.5rem);
  font-size: clamp(0.55rem, 0.67vw, 0.7rem);
  font-weight: 760;
  letter-spacing: 0.24em;
}

.transition-particle-source {
  display: grid;
  justify-items: center;
  gap: clamp(1.65rem, 4vh, 3.2rem);
  text-align: center;
}

.transition-particle-source span:first-child {
  font-size: clamp(5.8rem, 14.6vw, 14.8rem);
  font-weight: 750;
  letter-spacing: -0.092em;
  line-height: 0.77;
  white-space: nowrap;
}

.transition-particle-source span:last-child {
  font-size: clamp(1.45rem, 3vw, 3.35rem);
  font-weight: 590;
  letter-spacing: -0.07em;
  line-height: 1;
}

.transition-stage[data-enhanced="true"] .transition-particle-source {
  opacity: 0;
}

.transition-scroll-cue {
  position: absolute;
  bottom: clamp(1.8rem, 4vh, 3rem);
  left: 50%;
  display: grid;
  justify-items: center;
  gap: 0.6rem;
  color: #7d8381;
  font-size: 0.49rem;
  font-weight: 740;
  letter-spacing: 0.2em;
  transform: translateX(-50%);
}

.transition-scroll-cue i {
  position: relative;
  display: block;
  width: 1px;
  height: 1.8rem;
  overflow: hidden;
  background: #d5d9d8;
}

.transition-scroll-cue i::after {
  position: absolute;
  inset: -100% 0 100%;
  background: #111;
  content: "";
  animation: transition-cue 1.7s cubic-bezier(0.76, 0, 0.24, 1) infinite;
}

.transition-product-stage {
  position: absolute;
  z-index: 2;
  inset: 0;
  overflow: hidden;
  background: #fff;
  opacity: var(--t-photo-opacity);
  pointer-events: none;
  will-change: opacity, clip-path;
}

.transition-product {
  position: relative;
  overflow: hidden;
  margin: 0;
  background: #e6e7e6;
  will-change: clip-path, transform, width, height, border-radius;
}

.transition-product img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: translate3d(var(--t-image-x, 0%), var(--t-image-y, 0%), 0)
    scale(var(--t-image-scale));
  transition: transform 160ms linear;
  will-change: transform;
}

.transition-product-gold img {
  object-position: 50% 50%;
}

.transition-product-silver img {
  object-position: 51% 50%;
}

.transition-product::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgb(8 9 9 / 6%), transparent 28% 70%, rgb(8 9 9 / 25%));
  content: "";
  pointer-events: none;
}

.transition-product figcaption {
  position: absolute;
  z-index: 1;
  right: clamp(1rem, 2.1vw, 2rem);
  bottom: clamp(1.1rem, 2.2vw, 2rem);
  left: clamp(1rem, 2.1vw, 2rem);
  display: flex;
  justify-content: space-between;
  color: #fff;
  font-size: clamp(0.45rem, 0.55vw, 0.59rem);
  font-weight: 720;
  letter-spacing: 0.16em;
  text-shadow: 0 1px 1rem rgb(0 0 0 / 40%);
}

.transition-product figcaption strong {
  font: inherit;
}

.transition-seam {
  position: absolute;
  z-index: 3;
  pointer-events: none;
}

.transition-proof-label {
  position: absolute;
  z-index: 4;
  display: grid;
  gap: 0.36rem;
  opacity: var(--t-copy-opacity);
  color: #fff;
  text-shadow: 0 1px 1.4rem rgb(0 0 0 / 42%);
  transform: translate3d(0, var(--t-copy-y), 0);
}

.transition-proof-label span {
  font-size: 0.48rem;
  font-weight: 760;
  letter-spacing: 0.2em;
}

.transition-proof-label strong {
  font-size: clamp(1.35rem, 2.4vw, 2.5rem);
  font-weight: 590;
  letter-spacing: -0.055em;
}

/* 01 — the particle title opens like a physical aperture. */
.transition-stage[data-transition-variant="0"] .transition-product-stage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  clip-path: inset(0 var(--t-aperture));
}

.transition-stage[data-transition-variant="0"] .transition-product {
  min-width: 0;
}

.transition-stage[data-transition-variant="0"] .transition-seam {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: rgb(255 255 255 / 72%);
}

.transition-stage[data-transition-variant="0"] .transition-seam i {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0.46rem;
  height: 0.46rem;
  border: 1px solid rgb(255 255 255 / 82%);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.transition-stage[data-transition-variant="0"] .transition-proof-label {
  bottom: clamp(2.2rem, 5vh, 4rem);
  left: 50%;
  align-items: center;
  padding: 0.85rem 1.05rem;
  background: rgb(10 12 11 / 70%);
  text-align: center;
  transform: translate3d(-50%, var(--t-copy-y), 0);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

/* 02 — two product specimens rise, separate and settle as an editorial spread. */
.transition-stage[data-transition-variant="1"] .transition-product-stage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(0.8rem, 1.6vw, 1.6rem);
  padding: clamp(7.2rem, 14vh, 9rem) clamp(1rem, 4vw, 4rem) clamp(3.8rem, 7vh, 5.6rem);
  background: #f3f3f1;
}

.transition-stage[data-transition-variant="1"] .transition-product {
  border-radius: clamp(0.8rem, 1.5vw, 1.5rem);
  box-shadow: 0 1.4rem 4rem rgb(21 24 23 / 13%);
}

.transition-stage[data-transition-variant="1"] .transition-product-gold {
  transform: translate3d(var(--t-card-left-x), var(--t-card-y), 0)
    rotate(var(--t-card-left-rotate));
}

.transition-stage[data-transition-variant="1"] .transition-product-silver {
  transform: translate3d(var(--t-card-right-x), var(--t-card-y), 0)
    rotate(var(--t-card-right-rotate));
}

.transition-stage[data-transition-variant="1"] .transition-proof-label {
  top: clamp(5.6rem, 10vh, 7rem);
  right: clamp(1.2rem, 4vw, 4rem);
  color: #111;
  text-align: right;
  text-shadow: none;
}

.transition-stage[data-transition-variant="1"] .transition-seam {
  display: none;
}

/* 03 — surfaces enter as two halves of one folded sheet. */
.transition-stage[data-transition-variant="2"] .transition-product {
  position: absolute;
  inset: 0;
}

.transition-stage[data-transition-variant="2"] .transition-product-gold {
  clip-path: var(--t-gold-clip);
}

.transition-stage[data-transition-variant="2"] .transition-product-silver {
  clip-path: var(--t-silver-clip);
}

.transition-stage[data-transition-variant="2"] .transition-seam {
  top: -12vh;
  bottom: -12vh;
  left: 42%;
  width: 1px;
  background: rgb(255 255 255 / 76%);
  transform: rotate(16deg) scaleY(var(--t-progress));
  transform-origin: center;
}

.transition-stage[data-transition-variant="2"] .transition-proof-label {
  right: clamp(1.2rem, 3vw, 3rem);
  bottom: clamp(2.2rem, 5vh, 4rem);
  text-align: right;
}

/* 04 — two circular inspection lenses grow into a paired product field. */
.transition-stage[data-transition-variant="3"] .transition-product-stage {
  background: #f2f2ef;
}

.transition-stage[data-transition-variant="3"] .transition-product {
  position: absolute;
  top: 50%;
  width: var(--t-lens-width);
  height: var(--t-lens-height);
  border: 1px solid rgb(17 17 17 / 12%);
  border-radius: var(--t-lens-radius);
  box-shadow: 0 1.4rem 4rem rgb(21 24 23 / 12%);
  transform: translateY(-50%);
}

.transition-stage[data-transition-variant="3"] .transition-product-gold {
  left: clamp(1rem, 2.3vw, 2.4rem);
}

.transition-stage[data-transition-variant="3"] .transition-product-silver {
  right: clamp(1rem, 2.3vw, 2.4rem);
}

.transition-stage[data-transition-variant="3"] .transition-seam {
  top: 50%;
  left: 50%;
  width: clamp(2.5rem, 5vw, 5rem);
  height: clamp(2.5rem, 5vw, 5rem);
  border: 1px solid rgb(17 17 17 / 18%);
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(var(--t-progress));
}

.transition-stage[data-transition-variant="3"] .transition-seam::before,
.transition-stage[data-transition-variant="3"] .transition-seam::after {
  position: absolute;
  top: 50%;
  width: 100vw;
  height: 1px;
  background: rgb(17 17 17 / 10%);
  content: "";
}

.transition-stage[data-transition-variant="3"] .transition-seam::before {
  right: 100%;
}

.transition-stage[data-transition-variant="3"] .transition-seam::after {
  left: 100%;
}

.transition-stage[data-transition-variant="3"] .transition-proof-label {
  bottom: clamp(2.1rem, 4vh, 3rem);
  left: 50%;
  color: #111;
  text-align: center;
  text-shadow: none;
  transform: translate3d(-50%, var(--t-copy-y), 0);
}

.transition-sequence-controls {
  position: absolute;
  z-index: 12;
  bottom: clamp(0.9rem, 2.2vh, 1.4rem);
  left: clamp(0.8rem, 1.8vw, 1.5rem);
  display: grid;
  grid-template-columns: 2.6rem minmax(12rem, 17rem) 2.6rem;
  align-items: center;
  overflow: hidden;
  border: 1px solid rgb(18 20 19 / 14%);
  border-radius: 999px;
  background: rgb(255 255 255 / 90%);
  box-shadow: 0 0.55rem 2rem rgb(18 20 19 / 10%);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.transition-sequence-controls button {
  display: grid;
  height: 2.65rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: #111;
  cursor: pointer;
  font: inherit;
  place-items: center;
}

.transition-sequence-controls button:hover,
.transition-sequence-controls button:focus-visible {
  background: #111;
  color: #fff;
  outline: 0;
}

.transition-sequence-controls output {
  display: grid;
  align-content: center;
  min-height: 2.65rem;
  padding: 0.35rem 0.85rem;
  border-right: 1px solid rgb(18 20 19 / 10%);
  border-left: 1px solid rgb(18 20 19 / 10%);
  line-height: 1;
}

.transition-sequence-controls output span {
  color: #777d7b;
  font-size: 0.44rem;
  font-weight: 740;
  letter-spacing: 0.13em;
}

.transition-sequence-controls output strong {
  margin-top: 0.24rem;
  font-size: 0.61rem;
  font-weight: 760;
  letter-spacing: 0.08em;
}

.transition-guide {
  position: absolute;
  z-index: 11;
  right: clamp(1rem, 2.2vw, 2rem);
  bottom: clamp(1.25rem, 2.8vh, 1.85rem);
  color: rgb(17 17 17 / 56%);
  font-size: 0.47rem;
  font-weight: 720;
  letter-spacing: 0.16em;
  mix-blend-mode: difference;
}

@keyframes transition-cue {
  to {
    transform: translateY(200%);
  }
}

@media (max-width: 48rem) {
  .transition-lab {
    height: 290vh;
    height: 290svh;
  }

  .transition-intro {
    padding-right: 0.75rem;
    padding-left: 0.75rem;
  }

  .transition-particle-source span:first-child {
    font-size: clamp(4rem, 22.5vw, 6.3rem);
    letter-spacing: -0.105em;
  }

  .transition-particle-source span:last-child {
    font-size: clamp(1.35rem, 7.1vw, 2rem);
  }

  .transition-kicker {
    top: 18vh;
    font-size: 0.5rem;
  }

  .transition-guide {
    display: none;
  }

  .transition-sequence-controls {
    right: 1rem;
    bottom: 0.9rem;
    left: 1rem;
    grid-template-columns: 2.6rem minmax(0, 1fr) 2.6rem;
  }

  .transition-product figcaption {
    right: 0.75rem;
    bottom: 0.8rem;
    left: 0.75rem;
    font-size: 0.4rem;
  }

  .transition-proof-label strong {
    font-size: 1.2rem;
  }

  .transition-stage[data-transition-variant="0"] .transition-product-stage {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(2, minmax(0, 1fr));
    clip-path: inset(var(--t-aperture) 0);
  }

  .transition-stage[data-transition-variant="0"] .transition-seam {
    top: 50%;
    right: 0;
    bottom: auto;
    left: 0;
    width: auto;
    height: 1px;
  }

  .transition-stage[data-transition-variant="0"] .transition-proof-label {
    bottom: 4.7rem;
    padding: 0.65rem 0.8rem;
  }

  .transition-stage[data-transition-variant="1"] .transition-product-stage {
    grid-template-columns: 1fr;
    grid-template-rows: repeat(2, minmax(0, 1fr));
    gap: 0.6rem;
    padding: 7.4rem 0.7rem 4.2rem;
  }

  .transition-stage[data-transition-variant="1"] .transition-proof-label {
    top: 5.5rem;
    right: 0.85rem;
  }

  .transition-stage[data-transition-variant="2"] .transition-seam {
    left: 45%;
  }

  .transition-stage[data-transition-variant="2"] .transition-proof-label {
    right: 0.9rem;
    bottom: 4.8rem;
  }

  .transition-stage[data-transition-variant="3"] .transition-product {
    right: 0.7rem;
    left: 0.7rem;
    width: auto;
    height: var(--t-lens-mobile-height, 32vh);
    transform: none;
  }

  .transition-stage[data-transition-variant="3"] .transition-product-gold {
    top: 6.8rem;
  }

  .transition-stage[data-transition-variant="3"] .transition-product-silver {
    top: auto;
    bottom: 4.2rem;
  }

  .transition-stage[data-transition-variant="3"] .transition-seam,
  .transition-stage[data-transition-variant="3"] .transition-proof-label {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .transition-scroll-cue i::after {
    animation: none;
  }

  .transition-product img {
    transition: none;
  }
}