:root {
  /* IBM Plex Sans Condensed** for technical expedition tags */
  --fern: #8CFF3F;
  --orange: #FF6A1A;
  --bone: #F3E7C6;
  --mist: #D7FF8A;
  --ink: #07110D;
  --moss: #203B23;
  --display: "Fraunces", Georgia, serif;
  --body: "Alegreya Sans", Trebuchet MS, sans-serif;
  --label: "IBM Plex Sans Condensed", Arial Narrow, sans-serif;
  --condensed-marker: "Condensed**";
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--bone);
  background: var(--ink);
  font-family: var(--body);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 20;
  background:
    radial-gradient(circle at 22% 12%, rgba(140, 255, 63, .22), transparent 28%),
    radial-gradient(circle at 70% 42%, rgba(255, 106, 26, .10), transparent 22%),
    repeating-linear-gradient(90deg, rgba(243, 231, 198, .025) 0 1px, transparent 1px 52px);
  mix-blend-mode: screen;
}

.biome-scroll {
  position: relative;
  background:
    linear-gradient(90deg, transparent 0 47%, rgba(32, 59, 35, .72) 47% 53%, transparent 53%),
    radial-gradient(ellipse at center, rgba(140, 255, 63, .08), transparent 58%);
}

.chapter {
  min-height: 100vh;
  position: relative;
  display: grid;
  place-items: center;
  isolation: isolate;
  padding: 8vh 7vw;
  overflow: hidden;
  border-bottom: 1px solid rgba(140, 255, 63, .22);
}

.chapter::before {
  content: "";
  position: absolute;
  inset: -20%;
  z-index: -3;
  background: repeating-radial-gradient(circle at 50% 48%, transparent 0 42px, rgba(140, 255, 63, .13) 43px 45px, transparent 46px 96px);
  opacity: .35;
  transform: rotate(-8deg);
}

.simulation-trunk {
  position: absolute;
  top: -8vh;
  bottom: -8vh;
  left: 50%;
  width: min(20vw, 260px);
  transform: translateX(-50%);
  z-index: -1;
  border-inline: 3px solid rgba(140, 255, 63, .45);
  background:
    radial-gradient(ellipse at center, rgba(215, 255, 138, .25), transparent 44%),
    repeating-linear-gradient(105deg, rgba(7, 17, 13, .1) 0 18px, rgba(140, 255, 63, .11) 19px 24px),
    linear-gradient(180deg, #203B23, #07110D 52%, #203B23);
  box-shadow: 0 0 70px rgba(140, 255, 63, .28), inset 0 0 50px rgba(7, 17, 13, .9);
  clip-path: polygon(19% 0, 85% 0, 76% 18%, 91% 35%, 70% 55%, 83% 76%, 58% 100%, 17% 100%, 28% 77%, 12% 52%, 27% 29%);
}

.edge-nav {
  position: fixed;
  right: 18px;
  top: 50%;
  translate: 0 -50%;
  z-index: 30;
  display: grid;
  gap: 14px;
  font-family: var(--label);
  font-size: 11px;
  color: var(--fern);
  letter-spacing: .14em;
}

.edge-nav span {
  writing-mode: vertical-rl;
  padding: 9px 4px;
  background: rgba(7, 17, 13, .76);
  border: 1px solid rgba(140, 255, 63, .42);
}

.field-label {
  margin: 0 0 12px;
  font-family: var(--label);
  font-weight: 700;
  color: var(--fern);
  letter-spacing: .13em;
  text-transform: uppercase;
}

.orange { color: var(--orange); }

.hero { grid-template-columns: minmax(0, 1fr) minmax(320px, 560px); gap: 5vw; }

.hero-copy { justify-self: end; max-width: 760px; }

.tilted-plane {
  transform: rotate(-4deg) skewX(-2deg);
  padding: 24px;
  background: linear-gradient(135deg, rgba(32, 59, 35, .7), rgba(7, 17, 13, .35));
  border-left: 8px solid var(--orange);
}

h1, h2, .chapter-word {
  font-family: var(--display);
  font-weight: 900;
  line-height: .78;
  letter-spacing: -.08em;
}

h1 {
  margin: 0;
  font-size: clamp(5.5rem, 15vw, 17rem);
  color: var(--fern);
  text-shadow: 0 10px 0 var(--moss), 0 0 40px rgba(140, 255, 63, .45);
}

.declaration {
  max-width: 560px;
  margin: 26px 0 0;
  font-size: clamp(1.35rem, 2vw, 2.4rem);
  line-height: 1.05;
  font-weight: 800;
}

.weather-ring {
  position: absolute;
  border: 2px solid rgba(140, 255, 63, .42);
  border-radius: 50%;
  animation: rotateRing 28s linear infinite;
}
.ring-one { width: 54vw; height: 54vw; left: -14vw; top: -12vw; }
.ring-two { width: 38vw; height: 38vw; right: 12vw; bottom: -16vw; border-color: rgba(255, 106, 26, .55); animation-duration: 19s; animation-direction: reverse; }

.specimen-slab {
  width: min(92vw, 520px);
  height: min(78vh, 700px);
  position: relative;
  transform-style: preserve-3d;
  transform: perspective(1000px) rotateX(var(--rx, 7deg)) rotateY(var(--ry, -9deg));
  transition: transform .18s ease-out;
  border: 3px solid var(--fern);
  background: var(--moss);
  box-shadow: 24px 24px 0 rgba(255, 106, 26, .9), 0 0 70px rgba(140, 255, 63, .45);
}

.slab-layer {
  position: absolute;
  inset: 14px;
  background:
    radial-gradient(circle at 50% 30%, rgba(215, 255, 138, .34), transparent 22%),
    linear-gradient(90deg, rgba(7, 17, 13, .7), transparent 48%, rgba(7, 17, 13, .58)),
    repeating-linear-gradient(14deg, #203B23 0 28px, #07110D 29px 41px, #8CFF3F 42px 44px);
}

.terrain { position: absolute; inset: 24px; width: calc(100% - 48px); height: calc(100% - 48px); fill: none; }
.contour { stroke: rgba(243, 231, 198, .42); stroke-width: 3; }
.root { stroke: var(--fern); stroke-width: 8; stroke-linecap: round; filter: drop-shadow(0 0 10px var(--fern)); }
.river { stroke: var(--orange); stroke-width: 13; stroke-linecap: round; opacity: .8; }
.agent-path { stroke: var(--mist); stroke-width: 4; stroke-dasharray: 14 18; animation: trail 3.4s linear infinite; filter: drop-shadow(0 0 8px var(--fern)); }
.path-b { animation-duration: 4.6s; }

.beetle {
  position: absolute;
  width: 14px;
  height: 20px;
  border-radius: 50%;
  background: var(--fern);
  box-shadow: 0 0 18px var(--fern);
  animation: crawl 8s linear infinite;
}
.b1 { left: 22%; top: 76%; }
.b2 { left: 70%; top: 20%; animation-delay: -2.4s; }
.b3 { left: 50%; top: 50%; animation-delay: -5s; }
.slab-caption { position: absolute; left: 18px; bottom: 12px; margin: 0; font-family: var(--label); color: var(--bone); letter-spacing: .08em; }

.chapter-word {
  position: absolute;
  top: 7vh;
  left: 4vw;
  z-index: -2;
  font-size: clamp(5rem, 16vw, 18rem);
  color: transparent;
  -webkit-text-stroke: 2px rgba(140, 255, 63, .48);
  opacity: .86;
  transform: rotate(-5deg);
}

.placard, .vault-object {
  max-width: 560px;
  padding: clamp(24px, 4vw, 54px);
  background: linear-gradient(135deg, rgba(243, 231, 198, .96), rgba(215, 255, 138, .82));
  color: var(--ink);
  border: 3px solid var(--ink);
  box-shadow: 18px 18px 0 var(--fern), -12px -12px 0 var(--orange);
  transform-style: preserve-3d;
  transform: perspective(900px) rotateX(var(--card-rx, 0deg)) rotateY(var(--card-ry, 0deg)) rotate(-2deg);
  transition: transform .2s ease-out;
}
.right-card { justify-self: end; margin-left: 35vw; }
.left-card { justify-self: start; margin-right: 35vw; }
.placard h2, .vault-object h2 { margin: 0 0 20px; font-size: clamp(3rem, 7vw, 7.5rem); color: var(--ink); }
.placard p:not(.field-label), .vault-object p:not(.field-label) { font-size: clamp(1.25rem, 2vw, 2rem); line-height: 1.08; margin: 0; }

.storm { background: radial-gradient(circle at 65% 40%, rgba(255, 106, 26, .18), transparent 25%); }
.storm-glyph { position: absolute; width: 52vw; height: 52vw; right: -6vw; border-radius: 50%; border: 2px solid var(--orange); animation: pulse 2.8s infinite; }
.storm-glyph span { position: absolute; inset: 12%; border: 2px solid rgba(140,255,63,.45); border-radius: 45% 55% 52% 48%; transform: rotate(calc(var(--n, 1) * 18deg)); }
.storm-glyph span:nth-child(2){ inset: 24%; --n: 2; }.storm-glyph span:nth-child(3){ inset: 36%; --n: 3; }.storm-glyph span:nth-child(4){ inset: 48%; --n: 4; }
.tag-stack { position: absolute; right: 9vw; bottom: 10vh; display: grid; gap: 10px; font-family: var(--label); color: var(--ink); }
.tag-stack b { background: var(--orange); padding: 8px 14px; transform: rotate(3deg); }

.root-network, .delta { position: absolute; inset: auto 4vw 2vh auto; width: min(70vw, 900px); height: 70vh; fill: none; z-index: -1; }
.root-network path, .delta path { stroke: var(--fern); stroke-width: 10; stroke-linecap: round; stroke-dasharray: 1200; stroke-dashoffset: 1200; animation: grow 6s ease-in-out infinite alternate; filter: drop-shadow(0 0 12px var(--fern)); }
.delta path { stroke: var(--mist); }
.river { background: radial-gradient(circle at 30% 72%, rgba(140,255,63,.15), transparent 32%); }

.migration-field { position: absolute; inset: 18vh 8vw; z-index: -1; }
.migration-field i {
  position: absolute;
  width: 30px;
  height: 18px;
  background: var(--fern);
  clip-path: polygon(0 50%, 45% 0, 100% 50%, 45% 100%);
  filter: drop-shadow(0 0 12px var(--fern));
  animation: migrate 9s linear infinite;
}
.migration-field i:nth-child(1){ top: 8%; left: 5%; }.migration-field i:nth-child(2){ top: 18%; left: 32%; animation-delay: -1s; }.migration-field i:nth-child(3){ top: 30%; left: 62%; animation-delay: -2s; }.migration-field i:nth-child(4){ top: 42%; left: 18%; animation-delay: -3s; }.migration-field i:nth-child(5){ top: 54%; left: 76%; animation-delay: -4s; }.migration-field i:nth-child(6){ top: 66%; left: 44%; animation-delay: -5s; }.migration-field i:nth-child(7){ top: 78%; left: 12%; animation-delay: -6s; }.migration-field i:nth-child(8){ top: 86%; left: 66%; animation-delay: -7s; }

.vault { min-height: 110vh; background: radial-gradient(circle at 50% 70%, rgba(255, 106, 26, .16), transparent 34%); }
.vault-object { text-align: center; transform: perspective(900px) rotateX(var(--card-rx, 0deg)) rotateY(var(--card-ry, 0deg)); box-shadow: 0 0 0 12px var(--moss), 0 0 80px rgba(140,255,63,.48); }
.vault-seal { display: inline-block; margin-top: 28px; padding: 14px 22px; font-family: var(--label); letter-spacing: .14em; color: var(--bone); background: var(--ink); border: 2px solid var(--orange); }
.seed-pod { position: absolute; right: 12vw; top: 18vh; width: 190px; height: 190px; border: 2px solid var(--fern); border-radius: 50%; animation: rotateRing 12s linear infinite; }
.seed-pod span { position: absolute; inset: 28px; border: 2px solid var(--orange); border-radius: 50% 10% 50% 10%; transform: rotate(calc(var(--i, 1) * 60deg)); }
.seed-pod span:nth-child(2){ --i:2; }.seed-pod span:nth-child(3){ --i:3; }

.is-visible .placard, .is-visible .vault-object { animation: snapIn .55s cubic-bezier(.2, 1.4, .2, 1) both; }

@keyframes rotateRing { to { transform: rotate(360deg); } }
@keyframes trail { to { stroke-dashoffset: -128; } }
@keyframes crawl { 0% { transform: translate(0,0) rotate(0deg); } 33% { transform: translate(42px,-82px) rotate(80deg); } 66% { transform: translate(-36px,-150px) rotate(210deg); } 100% { transform: translate(0,0) rotate(360deg); } }
@keyframes grow { to { stroke-dashoffset: 0; } }
@keyframes pulse { 50% { transform: scale(1.08); box-shadow: 0 0 60px rgba(255, 106, 26, .6); } }
@keyframes migrate { from { transform: translate(-12vw, 8vh) rotate(-12deg); opacity: .3; } 45% { opacity: 1; } to { transform: translate(18vw, -12vh) rotate(18deg); opacity: .25; } }
@keyframes snapIn { from { opacity: .25; translate: 0 30px; } to { opacity: 1; translate: 0 0; } }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 12vh; }
  .hero-copy { justify-self: start; }
  .specimen-slab { height: 62vh; }
  .left-card, .right-card { margin: 0; justify-self: center; }
  .edge-nav { display: none; }
  .simulation-trunk { width: 34vw; opacity: .74; }
  .chapter { padding: 8vh 5vw; }
}