.art-origins-page .river-haze {
  background:
    radial-gradient(ellipse 58% 42% at 72% 24%, rgba(239, 228, 204, 0.08), transparent 72%),
    linear-gradient(132deg, rgba(91, 73, 52, 0.08), transparent 44%);
}

.art-origins-page .river-origin-intro {
  min-height: 100svh;
  padding-top: 150px;
}

.art-origins-page .river-origin-intro h1 {
  max-width: 1120px;
  margin: 0;
  font: 400 clamp(4.5rem, 9vw, 9.4rem)/0.82 var(--serif);
  letter-spacing: -0.045em;
}

.art-origins-page .river-origin-intro h1 em {
  color: rgba(244, 240, 231, 0.62);
  font-weight: 400;
}

.art-origins-page .river-origin-note {
  min-height: 78svh;
  padding-bottom: 110px;
}

.art-origins-page .river-origin-sticky {
  --origin-ink-x: 50%;
  --origin-ink-y: 50%;
  --origin-paper-x: 0px;
  --origin-paper-y: 0px;
  --origin-shadow-x: 0px;
  --origin-shadow-y: 0px;
  user-select: none;
}

.art-origins-page .river-origin-sticky img {
  -webkit-user-drag: none;
}

.art-origins-page .river-origin-world img {
  filter:
    contrast(1.055)
    saturate(0.68)
    drop-shadow(var(--origin-shadow-x) var(--origin-shadow-y) 0 rgba(22, 17, 11, 0.18));
  transition: filter 180ms linear;
}

.art-origins-page .river-origin-paper {
  background:
    radial-gradient(circle 18vmin at var(--origin-ink-x) var(--origin-ink-y), rgba(19, 14, 9, 0.16), transparent 72%),
    radial-gradient(circle at 50% 46%, transparent 36%, rgba(23, 20, 15, 0.22) 122%),
    linear-gradient(90deg, rgba(232, 224, 207, 0.14), transparent 13% 87%, rgba(232, 224, 207, 0.16));
  background-position: var(--origin-paper-x) var(--origin-paper-y), center, center;
}

.art-origins-page .river-origin-paper::after {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle 10vmin at var(--origin-ink-x) var(--origin-ink-y), rgba(12, 9, 6, 0.22), transparent 74%);
  content: "";
  opacity: var(--origin-ink-presence, 0);
  transition: opacity 360ms ease;
}

.art-origins-page .river-origin-sticky.has-ink-presence {
  --origin-ink-presence: 1;
}

.origin-ink-field {
  position: absolute;
  z-index: 4;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  mix-blend-mode: multiply;
}

.art-origins-page .river-origin-reveal-control {
  user-select: none;
  touch-action: none;
}

.art-origins-page .river-origin-sticky.is-revealing .river-origin-solvent {
  --origin-solvent-radius: 34vmin;
  opacity: 1;
  background: #eee7d9;
  mix-blend-mode: normal;
}

.art-origins-page .river-origin-solvent {
  transition: opacity 90ms ease, clip-path 190ms cubic-bezier(0.16, 1, 0.3, 1);
}

.art-origins-page .river-origin-sticky.is-revealing .river-origin-solvent::after {
  opacity: 0;
}

.art-origins-page .river-origin-sticky.is-revealing .river-origin-solvent img {
  opacity: 1;
  filter: grayscale(1) contrast(1.16) brightness(1.12);
  mix-blend-mode: normal;
}

.art-origins-page .river-origin-sticky.is-revealing .river-origin-paper::after {
  opacity: 0.18;
}

.origin-dot-genesis {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: #e8e0cf;
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
}

.origin-dot-genesis::before {
  width: 1.15rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: #090807;
  content: "";
}

.origin-dot-genesis span {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0.7rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: #090807;
  opacity: 0;
}

.origin-dot-genesis span:nth-child(2) { background: #ff2f92; }
.origin-dot-genesis span:nth-child(3) { background: #34d8f0; }
.origin-dot-genesis span:nth-child(4) { background: #b9ef00; }
.origin-dot-genesis span:nth-child(5) { background: #ff5a00; }

.origin-dot-genesis.is-departing {
  visibility: visible;
  animation: origin-genesis-veil 760ms ease both;
}

.origin-dot-genesis.is-departing::before {
  animation: origin-genesis-seed 760ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.origin-dot-genesis.is-departing span {
  animation: origin-genesis-dot 640ms cubic-bezier(0.16, 1, 0.3, 1) 100ms both;
}

.origin-dot-genesis.is-departing span:nth-child(1) { --dot-x: -4.8rem; --dot-y: -2.2rem; }
.origin-dot-genesis.is-departing span:nth-child(2) { --dot-x: 4rem; --dot-y: -3.6rem; }
.origin-dot-genesis.is-departing span:nth-child(3) { --dot-x: 5.4rem; --dot-y: 2.6rem; }
.origin-dot-genesis.is-departing span:nth-child(4) { --dot-x: -3.2rem; --dot-y: 4.2rem; }
.origin-dot-genesis.is-departing span:nth-child(5) { --dot-x: 0.4rem; --dot-y: 5.6rem; }

@keyframes origin-genesis-veil {
  0% { opacity: 0; }
  28%, 100% { opacity: 1; }
}

@keyframes origin-genesis-seed {
  0% { transform: scale(0.25); }
  38% { transform: scale(1); }
  100% { transform: scale(80); }
}

@keyframes origin-genesis-dot {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.2); }
  25%, 72% { opacity: 1; }
  100% { opacity: 0; transform: translate(calc(-50% + var(--dot-x)), calc(-50% + var(--dot-y))) scale(1.35); }
}

.origins-return {
  position: relative;
  z-index: 3;
  display: inline-flex;
  width: fit-content;
  margin: 48px auto 0;
  padding: 13px 17px 11px;
  border: 1px solid rgba(239, 228, 204, 0.38);
  color: rgba(239, 228, 204, 0.86);
  font: 600 0.64rem var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease;
}

.origins-return:hover,
.origins-return:focus-visible {
  border-color: #efe4cc;
  color: #05060b;
  background: #efe4cc;
  outline: none;
}

/* Dot Field does not opt into cross-document transitions; disabling the
   shared chapter transition here keeps the return path quiet and error-free. */
@view-transition {
  navigation: none;
}

@media (max-width: 720px) {
  .art-origins-page .river-origin-intro {
    min-height: 92svh;
    padding-top: 122px;
  }

  .art-origins-page .river-origin-intro h1 {
    font-size: clamp(3.7rem, 17vw, 5.8rem);
  }

  .art-origins-page .river-header-actions a:last-child {
    display: none;
  }

  .art-origins-page .river-origin-sticky.is-revealing .river-origin-solvent {
    --origin-solvent-radius: 44vmin;
  }
}

@media (prefers-reduced-motion: reduce) {
  .art-origins-page .river-origin-world img {
    filter: contrast(1.055) saturate(0.68);
  }

  .origin-dot-genesis.is-departing,
  .origin-dot-genesis.is-departing::before,
  .origin-dot-genesis.is-departing span {
    animation-duration: 1ms !important;
  }
}