:root {
  /* Typography brief: Space Grotesk** Grotes* from Google Fonts for terse developer labels and navigation fragments. Use **Source Serif 4** 4* from Google Fonts for longer notebook passages. */
  --frosted-vellum: #E8EEE8;
  --marble-white: #F6F1E8;
  --graphite: #252522;
  --clay: #9B6A49;
  --moss: #3E4A34;
  --oxide: #A13F2B;
  --blue-frost: #C9D9D7;
  --amber: #C2A36B;
  --pane: rgba(232, 238, 232, 0.58);
  --title-font: "Fraunces", Georgia, serif;
  --label-font: "Space Grotesk", system-ui, sans-serif;
  --serif-font: "Source Serif 4", Georgia, serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--graphite);
  background: var(--marble-white);
  font-family: var(--serif-font);
  overflow-x: hidden;
}

.marble-field,
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.marble-field {
  z-index: -3;
  background:
    radial-gradient(circle at 18% 12%, rgba(201, 217, 215, .72), transparent 28%),
    radial-gradient(circle at 74% 28%, rgba(194, 163, 107, .28), transparent 25%),
    radial-gradient(circle at 42% 79%, rgba(62, 74, 52, .25), transparent 31%),
    linear-gradient(118deg, transparent 0 26%, rgba(155, 106, 73, .12) 27%, transparent 31% 47%, rgba(161, 63, 43, .13) 48%, transparent 52%),
    repeating-linear-gradient(106deg, rgba(37, 37, 34, .045) 0 1px, transparent 1px 29px),
    var(--marble-white);
}

.grain {
  z-index: -2;
  opacity: .48;
  background-image:
    radial-gradient(circle, rgba(37, 37, 34, .16) 0 1px, transparent 1.5px),
    radial-gradient(circle, rgba(161, 63, 43, .13) 0 1px, transparent 1.8px);
  background-size: 21px 17px, 43px 37px;
  mix-blend-mode: multiply;
}

.margin-rail {
  position: fixed;
  z-index: 5;
  left: 0;
  top: 0;
  bottom: 0;
  width: clamp(155px, 19vw, 255px);
  padding: 24px 18px;
  border-right: 1px solid rgba(62, 74, 52, .35);
  background: linear-gradient(90deg, rgba(155, 106, 73, .23), rgba(232, 238, 232, .42));
  backdrop-filter: blur(12px);
}

.rail-stamp,
.errata-tag,
.accession-tag,
.plate-label,
.citation-slip,
.index-tab,
.oxide-mark,
.final-stamp {
  font-family: var(--label-font);
  text-transform: uppercase;
  letter-spacing: .08em;
}

.rail-stamp {
  display: inline-block;
  padding: 10px 11px;
  color: var(--oxide);
  border: 2px solid var(--oxide);
  transform: rotate(-4deg);
  font-size: 12px;
  line-height: 1.15;
  background: rgba(246, 241, 232, .42);
}

.chapter-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 38px 0 30px;
}

.chapter-list a {
  position: relative;
  width: 82%;
  padding: 7px 6px 7px 36px;
  color: var(--graphite);
  text-decoration: none;
  font-family: var(--label-font);
  font-size: 12px;
  border-top: 1px solid rgba(37, 37, 34, .28);
  transition: transform .45s cubic-bezier(.2, 1.4, .35, 1), color .3s;
}

.chapter-list a::before {
  content: attr(data-mark);
  position: absolute;
  left: 0;
  color: var(--clay);
}

.chapter-list a:hover,
.chapter-list a.is-near { transform: translateX(12px) rotate(-1deg); color: var(--oxide); }

.shelf-icon svg {
  width: 74px;
  fill: none;
  stroke: var(--moss);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: .74;
}

.rail-note {
  max-width: 170px;
  font-size: 14px;
  line-height: 1.2;
  color: var(--moss);
}

.rail-note.errata { color: var(--oxide); transform: rotate(3deg); }

.folio-book { margin-left: clamp(155px, 19vw, 255px); }

.plate {
  position: relative;
  min-height: 100vh;
  padding: clamp(25px, 4vw, 56px) clamp(28px, 5vw, 76px);
  border-bottom: 1px solid rgba(37, 37, 34, .24);
  overflow: hidden;
}

.plate::before {
  content: attr(data-plate);
  position: absolute;
  right: 4vw;
  top: 22px;
  font-family: var(--label-font);
  font-size: 11px;
  color: var(--clay);
  letter-spacing: .14em;
  text-transform: uppercase;
}

.title-shelf {
  position: relative;
  max-width: 920px;
  padding-top: 8px;
}

.accession-tag { color: var(--moss); font-size: 12px; margin-left: 9px; }

.kinetic-title,
.spread-heading {
  margin: 0;
  color: var(--graphite);
  font-family: var(--title-font);
  font-variation-settings: "wght" var(--wght, 650), "SOFT" var(--soft, 38), "WONK" 1, "opsz" 120;
  line-height: .84;
}

.kinetic-title {
  font-size: clamp(74px, 16vw, 214px);
  letter-spacing: -.085em;
  max-width: 930px;
}

.spread-heading {
  max-width: 780px;
  font-size: clamp(48px, 8vw, 126px);
  letter-spacing: -.055em;
  transform: translateX(-10px);
}

.k-letter {
  display: inline-block;
  transform: translateY(var(--lift, 0)) rotate(var(--rot, 0deg));
  animation: inkShift 4.8s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}

@keyframes inkShift {
  0%, 100% { font-variation-settings: "wght" 430, "SOFT" 18, "WONK" 1, "opsz" 34; filter: blur(0); }
  48% { font-variation-settings: "wght" 870, "SOFT" 88, "WONK" 1, "opsz" 120; filter: blur(.6px); }
}

.errata-tag {
  display: inline-block;
  margin-top: -10px;
  margin-left: 52%;
  padding: 7px 10px;
  color: var(--oxide);
  border: 1px solid var(--oxide);
  transform: rotate(5deg);
  font-size: 11px;
  background: rgba(246, 241, 232, .62);
}

.draw-map {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.draw-map path {
  fill: none;
  stroke: var(--oxide);
  stroke-width: 2.3;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: var(--path-length, 1400);
  stroke-dashoffset: var(--path-length, 1400);
  opacity: .78;
}

.draw-map.is-drawn path { animation: pathDraw 3.4s cubic-bezier(.44, .04, .12, 1) forwards; }
.draw-map.is-drawn path:nth-child(2) { animation-delay: .4s; }
.draw-map.is-drawn path:nth-child(3) { animation-delay: .75s; }

@keyframes pathDraw { to { stroke-dashoffset: 0; } }

.hero-map { z-index: 0; }
.plate > *:not(.draw-map) { position: relative; z-index: 1; }

.hero-fragments {
  display: grid;
  grid-template-columns: minmax(290px, 440px) minmax(280px, 1fr);
  gap: clamp(20px, 5vw, 72px);
  align-items: end;
  margin-top: clamp(28px, 8vh, 85px);
}

.frost-pane,
.note-card,
.colophon-sheet,
.tool-index article {
  background: var(--pane);
  border: 1px solid rgba(62, 74, 52, .34);
  box-shadow: 0 24px 70px rgba(37, 37, 34, .12);
  backdrop-filter: blur(13px);
}

.opening-note {
  padding: 24px 26px 30px;
  transform: rotate(-1.3deg);
  clip-path: polygon(0 0, 94% 0, 100% 13%, 100% 100%, 4% 100%, 0 92%);
}

.folio-number,
.note-card h3,
.route-pane h3,
.tool-index span {
  font-family: var(--label-font);
  color: var(--clay);
  text-transform: uppercase;
  letter-spacing: .12em;
}

.opening-note h2 {
  margin: 14px 0;
  font-family: var(--title-font);
  font-size: clamp(35px, 4vw, 59px);
  line-height: .92;
}

p { font-size: clamp(17px, 1.55vw, 22px); line-height: 1.35; }

.marble-slab {
  min-height: 40vh;
  padding: 28px;
  transform: translateY(30px) rotate(.8deg);
  background:
    radial-gradient(circle at 20% 18%, rgba(201, 217, 215, .75), transparent 28%),
    radial-gradient(circle at 80% 78%, rgba(194, 163, 107, .35), transparent 34%),
    linear-gradient(133deg, rgba(62, 74, 52, .18), transparent 16% 42%, rgba(155, 106, 73, .2) 45%, transparent 47%),
    rgba(232, 238, 232, .46);
  border: 1px solid rgba(37, 37, 34, .23);
  clip-path: polygon(3% 0, 100% 4%, 96% 95%, 0 100%);
}

.marble-slab span { font-family: var(--label-font); color: var(--moss); text-transform: uppercase; }
.marble-slab p { max-width: 310px; margin-top: 24vh; color: var(--clay); }

.citation-slip {
  grid-column: 1 / 3;
  width: min(550px, 65%);
  margin-left: 17%;
  padding: 9px 14px;
  color: var(--oxide);
  background: rgba(246, 241, 232, .64);
  border-left: 4px solid var(--oxide);
  transform: rotate(1.8deg);
  font-size: 12px;
}

.plate-label { margin-bottom: 18px; color: var(--oxide); font-size: 12px; }

.fragment-grid {
  display: grid;
  grid-template-columns: .9fr 1.2fr .55fr;
  gap: 28px;
  align-items: start;
  margin-top: 48px;
}

.note-card { padding: 22px 24px; }
.tall-note { min-height: 310px; transform: rotate(1.4deg); }
.torn-note { margin-top: 88px; clip-path: polygon(0 3%, 97% 0, 100% 89%, 92% 100%, 3% 97%); transform: rotate(-1.2deg); }

.stamp-stack {
  display: grid;
  place-items: center;
  min-height: 230px;
  color: var(--oxide);
  border: 2px solid var(--oxide);
  background: rgba(246, 241, 232, .36);
  transform: rotate(7deg);
}
.stamp-stack span, .stamp-stack em { font-family: var(--label-font); text-transform: uppercase; }
.stamp-stack strong { font-family: var(--title-font); font-size: 82px; line-height: .7; }

.bracket-map { top: 30%; left: 4%; width: 82%; height: 45%; }

.path-board {
  position: relative;
  min-height: 62vh;
  margin-top: 36px;
}

.route-pane { width: min(470px, 48%); padding: 22px; transform: rotate(-1.8deg); }
.route-pane.offset { margin-left: auto; margin-top: 100px; transform: rotate(1.7deg); }
.index-tab { display: inline-block; padding: 10px 22px; background: var(--amber); color: var(--graphite); transform: translateX(18vw) rotate(-2deg); font-size: 12px; }
.route-map { inset: 4% 0 0 3%; width: 90%; height: 72%; }

.tool-index {
  display: grid;
  grid-template-columns: repeat(4, minmax(150px, 1fr));
  gap: 18px;
  margin-top: 55px;
  margin-right: 8vw;
}
.tool-index article { min-height: 260px; padding: 19px; transform: translateY(var(--drop, 0)) rotate(var(--tilt, 0deg)); }
.tool-index article:nth-child(1) { --drop: 35px; --tilt: -2deg; }
.tool-index article:nth-child(2) { --drop: 0; --tilt: 1.5deg; }
.tool-index article:nth-child(3) { --drop: 72px; --tilt: -1deg; }
.tool-index article:nth-child(4) { --drop: 18px; --tilt: 2.5deg; }
.tool-index h3 { font-family: var(--title-font); font-size: 35px; margin: 14px 0 5px; }
.tool-index p { font-size: 18px; }
.oxide-mark { margin-top: 110px; color: var(--oxide); transform: rotate(-3deg); }

.colophon-sheet {
  max-width: 760px;
  margin-top: 50px;
  margin-left: 9vw;
  padding: clamp(24px, 5vw, 54px);
  clip-path: polygon(0 0, 92% 0, 100% 12%, 97% 100%, 0 96%);
}
.colophon-sheet b { color: var(--oxide); font-weight: 600; }
.final-stamp { display: inline-block; margin-top: 22px; padding: 10px 12px; color: var(--moss); border: 1px solid var(--moss); font-size: 12px; transform: rotate(2deg); }

.is-visible .frost-pane,
.is-visible .note-card,
.is-visible .tool-index article,
.is-visible .colophon-sheet,
.is-visible .marble-slab {
  animation: paneSettle 1.1s cubic-bezier(.17, 1.18, .41, 1) both;
}

@keyframes paneSettle {
  from { opacity: .35; translate: -10px 24px; filter: blur(3px); }
  to { opacity: 1; translate: 0 0; filter: blur(0); }
}

@media (max-width: 860px) {
  .margin-rail { position: relative; width: auto; min-height: auto; display: grid; grid-template-columns: 1fr 2fr; gap: 16px; }
  .folio-book { margin-left: 0; }
  .chapter-list { margin: 0; }
  .hero-fragments, .fragment-grid, .tool-index { grid-template-columns: 1fr; }
  .citation-slip { grid-column: auto; width: auto; margin-left: 0; }
  .route-pane { width: 88%; }
  .tool-index article { min-height: 180px; }
}