:root {
  /* Source Sans 3* 3** for body copy */
  --burnt: #B95420;
  --sky: #8FD4E8;
  --cream: #FFF2D8;
  --ink: #2A1710;
  --tangerine: #F29B4B;
  --cyan: #D9FAFF;
  --blue: #123A4A;
  --garamond: "EB Garamond", Georgia, serif;
  --sans: "Source Sans 3", Arial, sans-serif;
  --hud: "Orbitron", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 72% 8%, rgba(217,250,255,.9), transparent 25rem),
    linear-gradient(180deg, #FFF2D8 0%, #D9FAFF 48%, #FFF2D8 100%);
  font-family: var(--sans);
  overflow-x: hidden;
}

.aero-field {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    linear-gradient(90deg, rgba(18,58,74,.06) 1px, transparent 1px) 0 0 / 7.14vw 100%,
    linear-gradient(180deg, rgba(185,84,32,.08), transparent 18%, rgba(143,212,232,.18) 48%, transparent 84%);
}

.bubble, .current {
  position: absolute;
  display: block;
  border-radius: 999px;
  filter: blur(.2px);
}

.bubble {
  border: 1px solid rgba(143,212,232,.78);
  background: radial-gradient(circle at 30% 22%, rgba(255,255,255,.95), rgba(217,250,255,.2) 36%, rgba(143,212,232,.08));
  box-shadow: inset 0 18px 26px rgba(255,255,255,.38), 0 18px 48px rgba(18,58,74,.08);
  animation: floatBubble 12s ease-in-out infinite;
}

.bubble-a { width: 9rem; height: 9rem; top: 12%; left: 64%; }
.bubble-b { width: 4.7rem; height: 4.7rem; top: 68%; left: 11%; animation-delay: -4s; }
.bubble-c { width: 6.2rem; height: 6.2rem; top: 42%; right: 6%; animation-delay: -8s; }

.current {
  width: 48vw;
  height: 8rem;
  border: 1px solid rgba(143,212,232,.24);
  transform: rotate(-8deg);
  background: linear-gradient(90deg, transparent, rgba(217,250,255,.38), transparent);
}
.current-a { top: 22%; left: -10%; }
.current-b { bottom: 18%; right: -8%; transform: rotate(10deg); }

.journal-index {
  position: fixed;
  z-index: 10;
  top: 50%;
  right: 1.2rem;
  transform: translateY(-50%);
  display: grid;
  gap: .7rem;
  width: 9rem;
  padding: .8rem .65rem;
  border: 1px solid rgba(143,212,232,.5);
  border-radius: 999px;
  background: rgba(217,250,255,.34);
  box-shadow: inset 0 1px rgba(255,255,255,.8), 0 16px 44px rgba(18,58,74,.12);
  backdrop-filter: blur(18px);
}

.index-link {
  display: flex;
  gap: .45rem;
  align-items: center;
  color: rgba(42,23,16,.65);
  text-decoration: none;
  font: 500 .62rem/1 var(--hud);
  letter-spacing: .08em;
  text-transform: uppercase;
  transition: color .35s ease, transform .35s ease;
}

.index-link span {
  display: grid;
  place-items: center;
  width: 1.65rem;
  height: 1.65rem;
  border-radius: 50%;
  border: 1px solid rgba(18,58,74,.2);
  background: rgba(255,242,216,.42);
}

.index-link.is-active { color: var(--burnt); transform: translateX(-.24rem); }
.index-link.is-active span { border-color: var(--burnt); box-shadow: 0 0 18px rgba(242,155,75,.55); }

.scroll-book { position: relative; z-index: 1; scroll-snap-type: y mandatory; }
.chapter { min-height: 100vh; scroll-snap-align: start; position: relative; padding: clamp(5rem, 7vw, 8rem) clamp(1.25rem, 5vw, 5rem); display: grid; align-items: center; }

.chapter-grid {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(14, minmax(0, 1fr));
  gap: clamp(.7rem, 1.2vw, 1.2rem);
  align-items: center;
  position: relative;
}

.notation-gutter {
  grid-column: 1 / 3;
  align-self: stretch;
  border-left: 1px solid rgba(185,84,32,.46);
  padding-left: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 23rem;
  color: var(--blue);
}

.notation-gutter b { font: 600 .82rem/1 var(--hud); letter-spacing: .18em; }
.notation-gutter em { writing-mode: vertical-rl; transform: rotate(180deg); font: italic 1.1rem/1.1 var(--garamond); color: rgba(42,23,16,.58); }

.theorem-plate {
  grid-column: 3 / 11;
  position: relative;
  padding: clamp(2rem, 5vw, 4.8rem);
  border: 1px solid rgba(143,212,232,.5);
  border-radius: 2.4rem;
  background: linear-gradient(135deg, rgba(255,242,216,.84), rgba(217,250,255,.5));
  box-shadow: inset 0 1px rgba(255,255,255,.96), inset 0 -22px 44px rgba(143,212,232,.16), 0 26px 80px rgba(18,58,74,.13);
  backdrop-filter: blur(18px);
  overflow: hidden;
}

.theorem-plate::before {
  content: "";
  position: absolute;
  inset: 1rem 1.2rem auto 1.2rem;
  height: 42%;
  border-radius: 2rem;
  background: linear-gradient(180deg, rgba(255,255,255,.48), transparent);
  pointer-events: none;
}

.hud-stamp {
  position: relative;
  z-index: 1;
  margin-bottom: 1.4rem;
  color: var(--burnt);
  font: 500 .66rem/1.4 var(--hud);
  letter-spacing: .17em;
  text-transform: uppercase;
}

h1, h2 { position: relative; z-index: 1; margin: 0; font-family: var(--garamond); font-weight: 500; letter-spacing: -.035em; }
h1 { font-size: clamp(5.4rem, 17vw, 15rem); line-height: .76; color: var(--ink); }
h2 { font-size: clamp(3.1rem, 7.8vw, 7.6rem); line-height: .86; max-width: 12ch; }
p { position: relative; z-index: 1; font-size: clamp(1.05rem, 1.45vw, 1.32rem); line-height: 1.55; color: rgba(42,23,16,.78); }
.kicker { margin: 1.2rem 0 2.2rem; font: italic clamp(1.6rem, 3vw, 3rem)/1.1 var(--garamond); color: var(--blue); }

.axiom-line {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 1rem;
  align-items: center;
  color: var(--burnt);
  font: 600 .9rem/1.3 var(--sans);
  letter-spacing: .08em;
  text-transform: uppercase;
  opacity: 0;
  transform: translateX(-1.5rem);
  animation: axiomSlide 1.2s .45s ease forwards;
}

.axiom-line span { width: clamp(3rem, 11vw, 9rem); height: 2px; background: var(--burnt); box-shadow: 0 0 22px rgba(242,155,75,.75); }

.lens-note {
  grid-column: 11 / 15;
  padding: 1.2rem;
  border-radius: 1.25rem;
  border: 1px solid rgba(143,212,232,.55);
  background: rgba(217,250,255,.44);
  box-shadow: inset 0 1px rgba(255,255,255,.85), 0 16px 38px rgba(18,58,74,.1);
  backdrop-filter: blur(16px);
  opacity: .24;
  transform: translateY(1rem) scale(.98);
  transition: opacity .8s ease, transform .8s ease, box-shadow .8s ease;
}

.chapter.is-focused .lens-note, .lens-note.is-open { opacity: 1; transform: translateY(0) scale(1); box-shadow: inset 0 1px rgba(255,255,255,.95), 0 18px 52px rgba(185,84,32,.14); }
.lens-note p { margin: .7rem 0 0; font-size: .98rem; line-height: 1.45; }
.pin { width: .8rem; height: .8rem; display: inline-block; border-radius: 50%; background: var(--burnt); box-shadow: 0 0 0 .36rem rgba(242,155,75,.18), 0 0 24px rgba(242,155,75,.8); }

.aero-lens { position: absolute; z-index: 3; pointer-events: none; transition: transform 1s ease; }
.lens-one { grid-column: 8 / 14; width: min(38rem, 48vw); top: 28%; right: 1%; }
.lens-one svg { width: 100%; filter: drop-shadow(0 20px 40px rgba(18,58,74,.18)); }
.draw-arc { stroke-dasharray: 520; stroke-dashoffset: 520; transition: stroke-dashoffset 1.4s ease; }
.chapter.is-focused .draw-arc { stroke-dashoffset: 0; }

.reverse .theorem-plate { grid-column: 5 / 13; }
.reverse .notation-gutter { grid-column: 13 / 15; border-left: 0; border-right: 1px solid rgba(185,84,32,.46); padding-left: 0; padding-right: 1rem; align-items: flex-end; }
.reverse .lens-note { grid-column: 2 / 5; grid-row: 1; }

.glass-panel p, .dark-plate p { max-width: 44rem; margin-top: 1.5rem; }
.capsule-toggle {
  position: relative;
  z-index: 2;
  margin-top: 1.4rem;
  border: 1px solid rgba(185,84,32,.55);
  border-radius: 999px;
  padding: .78rem 1.2rem;
  color: var(--burnt);
  background: linear-gradient(180deg, rgba(255,242,216,.7), rgba(217,250,255,.45));
  font: 600 .7rem/1 var(--hud);
  letter-spacing: .12em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: inset 0 1px white, 0 12px 32px rgba(18,58,74,.08);
}

.orbit-diagram { grid-column: 1 / 6; grid-row: 1; width: 100%; opacity: .9; overflow: visible; }
.orbit-diagram text { fill: var(--blue); font: 600 12px var(--hud); letter-spacing: .12em; text-transform: uppercase; }
.node { animation: pulseNode 2.8s ease-in-out infinite; }
.node.muted { animation-delay: -1.1s; }

.night { background: linear-gradient(135deg, rgba(18,58,74,.94), rgba(18,58,74,.74) 48%, rgba(143,212,232,.18)); color: var(--cream); }
.night .notation-gutter, .night .notation-gutter em { color: rgba(255,242,216,.72); }
.dark-plate { background: linear-gradient(135deg, rgba(18,58,74,.84), rgba(217,250,255,.16)); border-color: rgba(217,250,255,.4); }
.dark-plate h2 { color: var(--cream); }
.dark-plate p { color: rgba(255,242,216,.78); }
.counter-row { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.counter-row span { border: 1px solid rgba(242,155,75,.5); border-radius: 999px; padding: .62rem .9rem; color: var(--tangerine); font: 500 .72rem/1 var(--hud); letter-spacing: .12em; text-transform: uppercase; }

.lens-two { grid-column: 9 / 14; width: min(28rem, 42vw); aspect-ratio: 1; right: 3%; }
.reticle-ring { position: relative; width: 100%; height: 100%; border-radius: 50%; border: 1px solid rgba(217,250,255,.68); background: radial-gradient(circle, rgba(217,250,255,.26), rgba(143,212,232,.05) 45%, transparent 65%); box-shadow: inset 0 0 45px rgba(217,250,255,.22); transition: transform 1.2s ease; }
.chapter.is-focused .reticle-ring { transform: rotate(18deg); }
.reticle-ring span { position: absolute; inset: 16%; border-radius: 50%; border: 1px dashed rgba(242,155,75,.58); }
.reticle-ring span:nth-child(2) { inset: 31%; border-style: solid; border-color: rgba(217,250,255,.5); }
.reticle-ring span:nth-child(3) { inset: 47%; background: var(--tangerine); box-shadow: 0 0 28px rgba(242,155,75,.75); border: 0; }

.wide { grid-column: 4 / 13; }
blockquote { position: relative; z-index: 1; margin: 2rem 0 0; padding-left: 1.3rem; border-left: 2px solid var(--burnt); font: italic clamp(1.5rem, 2.8vw, 2.6rem)/1.12 var(--garamond); color: var(--blue); }
.ribbon-map { grid-column: 1 / 7; grid-row: 1; height: 32rem; position: relative; opacity: .72; }
.ribbon-map span { position: absolute; left: 8%; right: 6%; height: 3rem; border: 1px solid rgba(143,212,232,.62); border-radius: 50%; transform: rotate(-17deg); background: linear-gradient(90deg, transparent, rgba(217,250,255,.44), transparent); }
.ribbon-map span:nth-child(1) { top: 15%; }
.ribbon-map span:nth-child(2) { top: 31%; left: 2%; border-color: rgba(185,84,32,.38); }
.ribbon-map span:nth-child(3) { top: 48%; }
.ribbon-map span:nth-child(4) { top: 65%; left: 16%; border-color: rgba(18,58,74,.25); }

.final { background: radial-gradient(circle at 50% 45%, rgba(217,250,255,.76), transparent 29rem), var(--cream); }
.final-grid { align-items: center; }
.final-plate { grid-column: 3 / 12; text-align: center; background: rgba(255,242,216,.62); }
.final-plate h2 { margin: 0 auto; max-width: 14ch; }
.final-axiom { margin: 2rem auto 0; max-width: 38rem; color: var(--burnt); font: italic clamp(1.7rem, 3vw, 3.1rem)/1.1 var(--garamond); }
.closing-mark { grid-column: 12 / 15; font: 600 clamp(6rem, 13vw, 12rem)/1 var(--garamond); color: rgba(185,84,32,.28); }

.chapter .theorem-plate { opacity: .78; transform: translateY(1.4rem); transition: opacity .8s ease, transform .8s ease; }
.chapter.is-focused .theorem-plate { opacity: 1; transform: translateY(0); }

@keyframes axiomSlide { to { opacity: 1; transform: translateX(0); } }
@keyframes floatBubble { 0%,100% { transform: translate3d(0,0,0) scale(1); } 50% { transform: translate3d(.8rem,-1.4rem,0) scale(1.04); } }
@keyframes pulseNode { 0%,100% { filter: drop-shadow(0 0 0 rgba(242,155,75,.2)); transform: scale(1); } 50% { filter: drop-shadow(0 0 16px rgba(242,155,75,.88)); transform: scale(1.08); } }

@media (max-width: 860px) {
  .journal-index { right: .6rem; width: 3rem; }
  .index-link { font-size: 0; gap: 0; }
  .chapter-grid, .chapter-grid.reverse { display: block; }
  .notation-gutter { min-height: auto; flex-direction: row; margin-bottom: 1rem; }
  .notation-gutter em { writing-mode: initial; transform: none; }
  .theorem-plate, .reverse .theorem-plate, .wide, .final-plate { width: calc(100% - 3.6rem); margin-right: 3.4rem; }
  .lens-note, .reverse .lens-note { width: calc(100% - 3.6rem); margin: 1rem 3.4rem 0 0; }
  .aero-lens, .orbit-diagram, .ribbon-map, .closing-mark { display: none; }
  h1 { font-size: clamp(4.6rem, 24vw, 7rem); }
}