:root {
  --terrain-paper: #f4efe6;
  --terrain-ivory: #fffaf1;
  --terrain-ink: #0b1b2c;
  --terrain-night: #071522;
  --terrain-teal: #22c6bb;
  --terrain-orange: #e2762d;
}

html,
body.terrain-page {
  width: 100%;
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
}

body.terrain-page {
  margin: 0;
  background: var(--terrain-paper);
  color: var(--terrain-ink);
}

body.terrain-page .public-footer { display: none; }

body.terrain-page .terrain-header {
  position: fixed;
  z-index: 30;
  top: 0;
  right: 0;
  left: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 3.8rem;
  padding: max(.7rem, env(safe-area-inset-top)) clamp(1rem, 4vw, 2rem) .7rem;
  border: 0;
  background: linear-gradient(180deg, rgba(244,239,230,.94), rgba(244,239,230,.66) 64%, transparent);
  color: var(--terrain-ink);
  backdrop-filter: blur(8px);
}

body.terrain-page .terrain-header .wordmark {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  width: fit-content;
  color: var(--terrain-ink);
  text-decoration: none;
}

body.terrain-page .terrain-header .where {
  margin: 0;
  color: rgba(11,27,44,.58);
  font-family: var(--sans);
  font-size: .56rem;
  font-weight: 700;
  letter-spacing: .17em;
}

.terrain-wordmark-text {
  font-family: var(--sans);
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .17em;
}

.terrain-birds {
  justify-self: end;
  display: flex;
  gap: .28rem;
  margin: 0;
}

.terrain-birds span {
  width: .38rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--terrain-ink);
}

.terrain-birds span:nth-child(2) { background: var(--terrain-teal); }
.terrain-birds span:nth-child(3) { background: var(--terrain-orange); }

.terrain-film {
  position: relative;
  width: 100%;
  height: 100svh;
  overflow: hidden;
  background: var(--terrain-paper);
}

.terrain-track {
  display: flex;
  width: 100%;
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-behavior: smooth;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  overscroll-behavior-x: contain;
  touch-action: pan-x;
}

.terrain-track::-webkit-scrollbar { display: none; }
.terrain-track:focus-visible { outline: 0; }

.terrain-panel {
  --scene-bg: var(--terrain-paper);
  --scene-image: none;
  position: relative;
  flex: 0 0 100%;
  width: 100%;
  min-width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--scene-bg);
  scroll-snap-align: start;
  scroll-snap-stop: always;
  isolation: isolate;
}

.scene-threshold { --scene-image: url("../assets/terrain/terrain-story-threshold-silent-v1.png"); }
.scene-language { --scene-image: url("../assets/terrain/terrain-story-door-v2.jpg"); }
.scene-distance { --scene-image: url("../assets/terrain/terrain-story-respectful-distance-v1.png"); }
.scene-silence { --scene-image: url("../assets/terrain/terrain-story-shared-silence-v1.png"); }
.scene-wait { --scene-image: url("../assets/terrain/terrain-story-encounter-can-wait-v1.png"); }
.scene-passage { --scene-image: url("../assets/terrain/terrain-story-silent-passage-v1.png"); }

.terrain-panel::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: 18%;
  right: -22vw;
  width: min(82vw, 36rem);
  aspect-ratio: 1;
  border: 1px solid rgba(34,198,187,.13);
  border-radius: 50%;
  box-shadow: inset 0 0 0 clamp(1rem, 5vw, 3rem) rgba(226,118,45,.035);
}

.scene-language::before,
.scene-silence::before { right: auto; left: -24vw; }

.scene-distance::before,
.scene-wait::before { right: -14vw; }

.scene-frame {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 3.8rem 0 4.9rem;
}

.scene-frame::before {
  content: "";
  position: absolute;
  z-index: 0;
  inset: 0;
  background-image: var(--scene-image);
  background-position: center;
  background-size: cover;
  filter: blur(24px) saturate(.72);
  opacity: 0;
  transform: scale(1.14);
  pointer-events: none;
}

.scene-art {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: .78;
  transform: scale(1.025) translateX(.45rem);
  transition: opacity .7s ease, transform 1.2s cubic-bezier(.2,.75,.2,1);
}

.terrain-panel.is-active .scene-art {
  opacity: 1;
  transform: scale(1) translateX(0);
}

.scene-caption {
  position: absolute;
  z-index: 3;
  right: clamp(1rem, 5vw, 4rem);
  bottom: clamp(5.4rem, 10vh, 7rem);
  display: grid;
  gap: .42rem;
  max-width: min(82vw, 30rem);
  padding: .72rem .9rem .78rem;
  border: 1px solid rgba(11,27,44,.1);
  border-radius: 1rem;
  background: rgba(255,250,241,.87);
  color: var(--terrain-ink);
  box-shadow: 0 .8rem 2.8rem rgba(7,21,34,.14);
  backdrop-filter: blur(10px);
  transform: translateY(.75rem);
  opacity: 0;
  transition: opacity .55s ease .16s, transform .55s ease .16s;
}

.terrain-panel.is-active .scene-caption {
  opacity: 1;
  transform: translateY(0);
}

.scene-distance .scene-caption,
.scene-wait .scene-caption {
  right: auto;
  left: 50%;
  transform: translate(-50%, .75rem);
}

.scene-distance.is-active .scene-caption,
.scene-wait.is-active .scene-caption {
  transform: translate(-50%, 0);
}

.scene-caption small {
  font-family: var(--sans);
  font-size: .48rem;
  font-weight: 700;
  letter-spacing: .15em;
}

.scene-caption h1,
.scene-caption h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.65rem, 4.7vw, 3.2rem);
  font-weight: 400;
  letter-spacing: -.045em;
  line-height: .95;
}

.scene-caption p {
  max-width: 31rem;
  margin: 0;
  color: rgba(11,27,44,.76);
  font-family: var(--sans);
  font-size: clamp(.68rem, 1.35vw, .88rem);
  line-height: 1.42;
}

.scene-choices .scene-caption h2 {
  display: flex;
  flex-wrap: wrap;
  gap: .2rem .62rem;
  font-family: var(--sans);
  font-size: clamp(.72rem, 1.6vw, .95rem);
  font-weight: 700;
  letter-spacing: .08em;
  line-height: 1.2;
  text-transform: uppercase;
}

.scene-choices .scene-caption span:nth-child(2) { color: #0a9388; }
.scene-choices .scene-caption span:nth-child(3) { color: var(--terrain-orange); }

.scene-ending { gap: .7rem; }

.scene-actions {
  display: flex;
  gap: .45rem;
}

.scene-actions a,
.scene-actions button {
  display: grid;
  place-items: center;
  width: 2.65rem;
  aspect-ratio: 1;
  border: 1px solid rgba(11,27,44,.15);
  border-radius: 50%;
  background: rgba(255,255,255,.48);
  color: var(--terrain-ink);
  cursor: pointer;
  font-family: var(--sans);
  font-size: 1.1rem;
  line-height: 1;
  text-decoration: none;
}

.scene-actions .scene-discover-link {
  width: auto;
  min-height: 2.65rem;
  aspect-ratio: auto;
  padding: 0 1rem;
  border-color: rgba(226,118,45,.5);
  border-radius: 999px;
  background: var(--terrain-ink);
  color: var(--terrain-ivory);
  font-size: .62rem;
  font-weight: 750;
  letter-spacing: .035em;
  white-space: nowrap;
}

.scene-actions .scene-heart {
  border-color: rgba(226,118,45,.45);
  color: var(--terrain-orange);
}

.scene-note {
  position: absolute;
  z-index: 25;
  top: max(4.5rem, calc(env(safe-area-inset-top) + 4rem));
  right: 1rem;
  width: min(18rem, calc(100% - 2rem));
  color: var(--terrain-ink);
  font-family: var(--sans);
}

.scene-note summary {
  display: grid;
  place-items: center;
  width: 2rem;
  aspect-ratio: 1;
  margin-left: auto;
  border: 1px solid rgba(11,27,44,.16);
  border-radius: 50%;
  background: rgba(255,250,241,.86);
  cursor: pointer;
  font-size: .68rem;
  list-style: none;
}

.scene-note summary::-webkit-details-marker { display: none; }

.scene-note p {
  margin: .45rem 0 0;
  padding: .8rem;
  border: 1px solid rgba(11,27,44,.12);
  border-radius: .8rem;
  background: rgba(255,250,241,.94);
  font-size: .64rem;
  line-height: 1.5;
}

.terrain-path {
  position: fixed;
  z-index: 35;
  right: clamp(.75rem, 3vw, 1.6rem);
  bottom: max(.65rem, env(safe-area-inset-bottom));
  left: clamp(.75rem, 3vw, 1.6rem);
  display: grid;
  grid-template-columns: auto minmax(4rem, 1fr) auto auto;
  align-items: center;
  gap: .55rem;
  min-height: 3.15rem;
  padding: .38rem .48rem;
  border: 1px solid rgba(255,250,241,.16);
  border-radius: 999px;
  background: rgba(7,21,34,.9);
  color: var(--terrain-ivory);
  box-shadow: 0 .8rem 2.6rem rgba(7,21,34,.25);
  backdrop-filter: blur(14px);
}

.terrain-arrow {
  display: grid;
  place-items: center;
  width: 2.3rem;
  aspect-ratio: 1;
  border: 0;
  border-radius: 50%;
  background: rgba(255,250,241,.08);
  color: var(--terrain-ivory);
  cursor: pointer;
  font-size: .95rem;
}

.terrain-arrow:disabled { opacity: .25; cursor: default; }

.terrain-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .38rem;
}

.terrain-dots button {
  width: .38rem;
  height: .38rem;
  border: 0;
  border-radius: 50%;
  padding: 0;
  background: rgba(255,250,241,.26);
  cursor: pointer;
  transition: width .25s ease, border-radius .25s ease, background .25s ease;
}

.terrain-dots button.is-active {
  width: 1.35rem;
  border-radius: 999px;
  background: var(--terrain-orange);
}

.terrain-progress {
  display: grid;
  gap: .05rem;
  margin: 0;
  font-family: var(--sans);
  font-size: .52rem;
  letter-spacing: .08em;
  white-space: nowrap;
}

.terrain-progress small { color: rgba(255,250,241,.5); font-size: .42rem; }

.terrain-arrow:focus-visible,
.terrain-dots button:focus-visible,
.scene-actions :is(a, button):focus-visible,
.scene-note summary:focus-visible {
  outline: 2px solid var(--terrain-orange);
  outline-offset: 3px;
}

@media (orientation: portrait) {
  .scene-frame {
    padding: 4.4rem 0 5.2rem;
  }

  .scene-art {
    position: relative;
    z-index: 1;
    width: 132vw;
    max-width: none;
    height: auto;
    max-height: calc(100svh - 11rem);
    border-block: 1px solid rgba(11,27,44,.08);
    object-fit: contain;
    box-shadow: 0 1.5rem 4rem rgba(7,21,34,.1);
  }

  .scene-frame-whole .scene-art { width: 100vw; }

  .scene-frame::before {
    opacity: .3;
  }

  .scene-caption {
    right: auto;
    bottom: 5.25rem;
    left: 1rem;
    max-width: calc(100% - 2rem);
  }

  .scene-distance .scene-caption,
  .scene-wait .scene-caption,
  .scene-distance.is-active .scene-caption,
  .scene-wait.is-active .scene-caption {
    right: auto;
    left: 1rem;
    transform: translateY(0);
  }

  .scene-choices .scene-caption { right: 1rem; }
}

@media (max-width: 520px) {
  .terrain-wordmark-text { display: none; }
  .terrain-progress small { display: none; }
  .terrain-path { grid-template-columns: auto minmax(4rem,1fr) auto auto; }
  .scene-caption h1,
  .scene-caption h2 { font-size: clamp(1.55rem, 8vw, 2.3rem); }
  .scene-choices .scene-caption h2 { font-size: .66rem; }
  .scene-actions .scene-discover-link {
    padding-inline: .82rem;
    font-size: .56rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .terrain-track { scroll-behavior: auto; }
  .scene-art,
  .scene-caption,
  .terrain-dots button { transition: none; }
}