:root {
  /* Design typography tokens: Roboto Condensed** Condense from Google Fonts; IBM Plex Sans Condensed** Condense from Google Fonts; Spectral from Google Fonts. */
  --abyss-ink: #031826;
  --bathyal-blue: #073B5A;
  --current-teal: #12B8C8;
  --manuscript-foam: #EAF7F2;
  --sunlit-margin: #FFE66D;
  --coral-revision: #FF7A6B;
  --violet-depth: #6652FF;
  --depth-bg: #073B5A;
  --folio: #EAF7F2;
  --accent: #FFE66D;
  --rim: #12B8C8;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--abyss-ink);
  color: var(--manuscript-foam);
  font-family: "Spectral", serif;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 72% 18%, rgba(18, 184, 200, .22), transparent 26rem),
    radial-gradient(circle at 42% 75%, rgba(102, 82, 255, .18), transparent 30rem),
    linear-gradient(135deg, rgba(7, 59, 90, .92), var(--abyss-ink));
  pointer-events: none;
  transition: background 700ms ease;
}

.codex-spine {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 10;
  width: 21vw;
  min-width: 245px;
  padding: 2.2rem 1.35rem 1.8rem;
  background:
    linear-gradient(90deg, rgba(3, 24, 38, .98), rgba(3, 24, 38, .88)),
    repeating-linear-gradient(180deg, transparent 0 24px, rgba(234, 247, 242, .035) 25px 26px);
  border-right: 2px solid rgba(18, 184, 200, .28);
  box-shadow: 1rem 0 3rem rgba(0, 0, 0, .34), inset -1rem 0 2rem rgba(7, 59, 90, .5);
}

.spine-title { font-family: "IBM Plex Sans Condensed", sans-serif; text-transform: uppercase; letter-spacing: .08em; }
.spine-title strong { display: block; margin-top: .35rem; color: var(--manuscript-foam); font: 700 2.35rem/0.9 "Roboto Condensed", sans-serif; }
.spine-title small { display: block; margin-top: .6rem; color: rgba(234, 247, 242, .62); font-size: .78rem; }
.folio-tag { display: inline-block; padding: .25rem .58rem; border-radius: 999px; color: var(--abyss-ink); background: var(--sunlit-margin); font-weight: 700; }

.cord-wrap { position: absolute; left: 1.05rem; top: 11.5rem; bottom: 8rem; width: 20px; }
.stitched-cord { position: absolute; left: 9px; top: 0; bottom: 0; border-left: 2px dashed rgba(234, 247, 242, .28); }
.reading-bead {
  position: absolute;
  left: 0;
  top: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 28%, #EAF7F2 0 12%, var(--accent) 28%, var(--current-teal) 78%);
  box-shadow: 0 0 1.2rem var(--accent), inset -.25rem -.25rem .65rem rgba(3, 24, 38, .5);
  transition: top 260ms ease, background 500ms ease;
}

.chapter-nav { display: grid; gap: .65rem; margin-top: 4.8rem; padding-left: 1.55rem; }
.chapter-link {
  display: grid;
  grid-template-columns: 3.05rem 1fr;
  align-items: center;
  gap: .7rem;
  min-height: 4rem;
  color: rgba(234, 247, 242, .68);
  text-decoration: none;
  font-family: "IBM Plex Sans Condensed", sans-serif;
  transition: transform 300ms ease, color 300ms ease, filter 300ms ease;
}
.chapter-link b { display: block; font: 700 1.05rem/1 "Roboto Condensed", sans-serif; letter-spacing: .12em; text-transform: uppercase; }
.chapter-link em { display: block; margin-top: .25rem; font-style: normal; font-size: .78rem; color: rgba(234, 247, 242, .45); }
.glyph-bubble {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 1.15rem 1.4rem 1.05rem 1.5rem;
  background: radial-gradient(circle at 28% 22%, #EAF7F2 0 10%, rgba(18, 184, 200, .9) 28%, rgba(102, 82, 255, .68) 100%);
  color: var(--abyss-ink);
  font-size: 1.45rem;
  box-shadow: inset -.45rem -.55rem .85rem rgba(3, 24, 38, .28), .28rem .45rem 1rem rgba(0, 0, 0, .32);
}
.chapter-link.active { color: var(--sunlit-margin); transform: translateX(.25rem); filter: drop-shadow(0 0 .85rem rgba(255, 230, 109, .45)); }
.chapter-link.active .glyph-bubble { background: radial-gradient(circle at 30% 20%, #EAF7F2 0 12%, var(--sunlit-margin) 34%, var(--current-teal) 100%); }

.margin-specimen {
  position: absolute;
  left: 1.35rem;
  right: 1.35rem;
  bottom: 1.35rem;
  padding: 1rem;
  border-radius: 1.3rem;
  background: rgba(7, 59, 90, .58);
  border: 1px solid rgba(18, 184, 200, .22);
  font-family: "IBM Plex Sans Condensed", sans-serif;
}
.margin-specimen span { color: var(--current-teal); text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; }
.margin-specimen p { margin: .55rem 0 0; color: rgba(234, 247, 242, .72); }

.manuscript-stage {
  position: relative;
  margin-left: max(245px, 21vw);
  background: linear-gradient(180deg, var(--depth-bg), var(--abyss-ink));
  transition: background 700ms ease;
}

.caustic-light {
  position: fixed;
  inset: 0 0 0 max(245px, 21vw);
  z-index: 1;
  pointer-events: none;
  opacity: .22;
  mix-blend-mode: screen;
  background: repeating-radial-gradient(ellipse at 40% 0%, transparent 0 34px, rgba(234, 247, 242, .18) 36px 38px, transparent 40px 78px);
  animation: causticDrift 18s linear infinite;
}

.chapter-plate {
  --plate-accent: var(--accent);
  --plate-rim: var(--rim);
  --plate-bg: var(--depth-bg);
  position: relative;
  z-index: 2;
  min-height: 100vh;
  display: grid;
  align-items: center;
  padding: 5.5rem clamp(2rem, 5vw, 5.5rem);
  filter: blur(14px);
  opacity: .42;
  transform: scale(1.055);
  transition: filter 750ms ease, opacity 750ms ease, transform 750ms ease;
}
.chapter-plate.active { filter: blur(0); opacity: 1; transform: scale(1); }

.depth-number {
  position: absolute;
  top: 2rem;
  right: clamp(2rem, 5vw, 5rem);
  z-index: 4;
  padding: .42rem .85rem;
  border-radius: 999px;
  background: var(--plate-accent);
  color: var(--abyss-ink);
  font: 700 .82rem/1 "IBM Plex Sans Condensed", sans-serif;
  letter-spacing: .11em;
  box-shadow: 0 .45rem 1.2rem rgba(0, 0, 0, .26);
}

.folio-shell {
  position: relative;
  display: grid;
  grid-template-columns: minmax(14rem, 26rem) minmax(18rem, 1fr);
  gap: clamp(2rem, 4vw, 4.5rem);
  align-items: center;
  padding: clamp(2rem, 5vw, 4.4rem);
  border-radius: 3rem 4.2rem 3.2rem 4.8rem;
  background:
    radial-gradient(circle at 18% 16%, rgba(234, 247, 242, .75), transparent 7rem),
    linear-gradient(135deg, rgba(234, 247, 242, .96), rgba(234, 247, 242, .82));
  color: var(--abyss-ink);
  box-shadow: inset -.9rem -1rem 1.8rem rgba(7, 59, 90, .18), inset .7rem .7rem 1.2rem rgba(255, 255, 255, .65), 0 2.5rem 5.5rem rgba(0, 0, 0, .36);
}
.folio-shell::before {
  content: "";
  position: absolute;
  inset: .85rem;
  border-radius: inherit;
  border: 2px solid color-mix(in srgb, var(--plate-rim) 65%, transparent);
  pointer-events: none;
}

.plate-copy { position: relative; z-index: 2; max-width: 45rem; }
.kicker { margin: 0 0 .8rem; color: var(--coral-revision); font: 700 .95rem/1 "IBM Plex Sans Condensed", sans-serif; letter-spacing: .13em; text-transform: uppercase; }
h1, h2 { margin: 0; color: var(--abyss-ink); font: 700 clamp(3.2rem, 7vw, 7rem)/.82 "Roboto Condensed", sans-serif; letter-spacing: .035em; text-transform: uppercase; }
.plate-copy p:not(.kicker), blockquote { font-size: clamp(1.1rem, 1.7vw, 1.45rem); line-height: 1.55; color: rgba(3, 24, 38, .78); }
blockquote { margin: 1.2rem 0 0; padding-left: 1rem; border-left: .35rem solid var(--plate-accent); font-weight: 600; }

.specimen-object, .magnifier {
  position: relative;
  z-index: 2;
  justify-self: center;
  display: grid;
  place-items: center;
  width: clamp(12rem, 23vw, 19rem);
  aspect-ratio: 1;
  border-radius: 42% 58% 48% 52% / 55% 44% 56% 45%;
  background: radial-gradient(circle at 28% 22%, #EAF7F2 0 12%, var(--plate-accent) 30%, var(--plate-rim) 62%, var(--violet-depth) 100%);
  box-shadow: inset -1.5rem -1.8rem 2.4rem rgba(3, 24, 38, .35), inset 1rem 1rem 1.2rem rgba(255, 255, 255, .55), 0 1.8rem 3rem rgba(7, 59, 90, .28);
  animation: buoy 6s ease-in-out infinite;
}
.specimen-object span, .magnifier span { font: 700 clamp(7rem, 14vw, 12rem)/1 "Roboto Condensed", sans-serif; color: rgba(3, 24, 38, .82); transform: translateY(-.08em); }
.comma-object { transform: rotate(-8deg); }

.marginalia-cluster, .glossary-ribbons {
  position: absolute;
  z-index: 3;
  right: clamp(1.5rem, 3vw, 3rem);
  bottom: clamp(1.3rem, 3vw, 2.4rem);
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  max-width: 24rem;
}
.vertical { flex-direction: column; right: 2rem; top: 2rem; bottom: auto; }
.note-pill {
  border: 0;
  cursor: pointer;
  border-radius: 999px;
  padding: .55rem .85rem;
  background: var(--abyss-ink);
  color: var(--manuscript-foam);
  font: 700 .83rem/1 "IBM Plex Sans Condensed", sans-serif;
  letter-spacing: .06em;
  text-transform: uppercase;
  box-shadow: inset -.22rem -.28rem .55rem rgba(18, 184, 200, .25), 0 .55rem 1rem rgba(0, 0, 0, .24);
  transition: transform 220ms ease, background 220ms ease, color 220ms ease;
}
.note-pill:hover, .note-pill.is-lit { transform: translateY(-.18rem); background: var(--plate-accent); color: var(--abyss-ink); }

.script-graph {
  position: absolute;
  z-index: 3;
  width: min(38vw, 32rem);
  right: clamp(2rem, 4vw, 5rem);
  top: 12%;
  overflow: visible;
  filter: drop-shadow(0 0 1.2rem rgba(18, 184, 200, .32));
}
.script-graph.lower { top: auto; bottom: 7%; }
.script-graph path { fill: none; stroke: var(--plate-rim); stroke-width: 4; stroke-linecap: round; stroke-dasharray: 8 12; opacity: .82; }
.script-graph circle { fill: var(--plate-accent); stroke: var(--manuscript-foam); stroke-width: 4; transition: transform 250ms ease, filter 250ms ease, fill 250ms ease; transform-box: fill-box; transform-origin: center; }
.script-graph circle.is-pulsing { transform: scale(1.45); fill: var(--coral-revision); filter: drop-shadow(0 0 .9rem var(--plate-accent)); }

.split-shell { grid-template-columns: 1fr minmax(17rem, 28rem); }
.inflated-stack { position: relative; height: 23rem; animation: buoy 7s ease-in-out infinite; }
.page-leaf {
  position: absolute;
  display: grid;
  place-items: center;
  width: 18rem;
  height: 10rem;
  border-radius: 2.5rem 3.5rem 2.6rem 3.2rem;
  background: linear-gradient(135deg, #EAF7F2, rgba(255, 230, 109, .92));
  color: var(--abyss-ink);
  font: 700 1.2rem/1 "IBM Plex Sans Condensed", sans-serif;
  text-transform: uppercase;
  box-shadow: inset -.75rem -.8rem 1rem rgba(7, 59, 90, .16), 0 1rem 2rem rgba(0, 0, 0, .25);
}
.leaf-one { top: 1rem; left: 1rem; transform: rotate(-10deg); }
.leaf-two { top: 6.3rem; left: 4.5rem; transform: rotate(7deg); background: linear-gradient(135deg, #EAF7F2, rgba(255, 122, 107, .82)); }
.leaf-three { top: 12rem; left: 0; transform: rotate(-3deg); background: linear-gradient(135deg, #EAF7F2, rgba(18, 184, 200, .78)); }
.revision-mark { position: absolute; right: 1rem; top: 2rem; color: var(--coral-revision); font: 700 8rem/1 "Roboto Condensed", sans-serif; }

.graph-folio { grid-template-columns: 1fr minmax(18rem, 30rem); }
.narrow-copy { max-width: 34rem; }
.token-island { position: relative; min-height: 24rem; animation: buoy 8s ease-in-out infinite; }
.token-island span, .index-tabs span {
  position: absolute;
  padding: .65rem 1rem;
  border-radius: 1.2rem 1.5rem 1.1rem 1.4rem;
  background: var(--abyss-ink);
  color: var(--manuscript-foam);
  font: 700 1rem/1 "IBM Plex Sans Condensed", sans-serif;
  box-shadow: inset -.35rem -.38rem .7rem rgba(102, 82, 255, .45), 0 .75rem 1.3rem rgba(0, 0, 0, .25);
}
.token-island span:nth-child(1) { left: 5%; top: 18%; }
.token-island span:nth-child(2) { right: 8%; top: 6%; background: var(--plate-accent); color: var(--abyss-ink); }
.token-island span:nth-child(3) { left: 34%; top: 44%; }
.token-island span:nth-child(4) { right: 2%; bottom: 18%; }
.token-island span:nth-child(5) { left: 8%; bottom: 8%; background: var(--plate-rim); color: var(--abyss-ink); }

.gloss-shell { grid-template-columns: minmax(12rem, 22rem) 1fr; }
.magnifier::after { content: ""; position: absolute; width: 42%; height: 1.15rem; border-radius: 999px; background: var(--abyss-ink); right: -24%; bottom: 12%; transform: rotate(38deg); box-shadow: inset -.3rem -.2rem .4rem rgba(18, 184, 200, .35); }

.index-shell { grid-template-columns: 1fr minmax(16rem, 26rem); }
.index-tabs { position: relative; height: 24rem; animation: buoy 6.5s ease-in-out infinite; }
.index-tabs span:nth-child(1) { left: 3%; top: 4%; background: var(--sunlit-margin); color: var(--abyss-ink); }
.index-tabs span:nth-child(2) { right: 1%; top: 22%; background: var(--coral-revision); color: var(--abyss-ink); }
.index-tabs span:nth-child(3) { left: 18%; top: 43%; }
.index-tabs span:nth-child(4) { right: 15%; bottom: 20%; background: var(--current-teal); color: var(--abyss-ink); }
.index-tabs span:nth-child(5) { left: 0; bottom: 3%; background: var(--violet-depth); }

@keyframes buoy {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 -1.1rem; }
}

@keyframes causticDrift {
  0% { transform: translate3d(-3%, -2%, 0) rotate(0deg); }
  100% { transform: translate3d(3%, 4%, 0) rotate(3deg); }
}

@media (max-width: 900px) {
  .codex-spine { width: 100%; min-width: 0; height: 7.2rem; padding: .8rem 1rem; border-right: 0; border-bottom: 2px solid rgba(18, 184, 200, .28); }
  .spine-title small, .margin-specimen, .cord-wrap { display: none; }
  .spine-title strong { font-size: 1.5rem; }
  .chapter-nav { display: flex; gap: .35rem; overflow-x: auto; margin-top: .65rem; padding-left: 0; }
  .chapter-link { min-width: 9.4rem; grid-template-columns: 2.2rem 1fr; gap: .45rem; }
  .glyph-bubble { width: 2.15rem; height: 2.15rem; border-radius: .8rem; font-size: 1rem; }
  .chapter-link em { display: none; }
  .manuscript-stage { margin-left: 0; padding-top: 7.2rem; }
  .caustic-light { inset-left: 0; }
  .chapter-plate { padding: 4.5rem 1rem; }
  .folio-shell, .split-shell, .graph-folio, .gloss-shell, .index-shell { grid-template-columns: 1fr; border-radius: 2rem; }
  .script-graph { width: 70vw; opacity: .58; }
  .marginalia-cluster, .glossary-ribbons { position: relative; right: auto; bottom: auto; top: auto; margin-top: 1rem; }
}