:root {
  --aged-paper: #E8D8B8;
  --deep-sepia: #3A2718;
  --notebook-tan: #B89263;
  --lagoon-green: #2F8F83;
  --teal-shadow: #1D5C57;
  --coral: #D96E4F;
  --cream: #F7EFD8;
  --dark-silt: #17120D;
  --heading: "Noto Sans", "Trebuchet MS", Arial, sans-serif;
  --body: "Atkinson Hyperlegible", Verdana, sans-serif;
  --serif: "IBM Plex Serif", Georgia, serif;
  /* IBM Plex Serif* Serif** from Google Fonts in Italic for quoted fragments */
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--deep-sepia);
  background: var(--cream);
  font-family: var(--body);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 18% 12%, rgba(217, 110, 79, 0.12), transparent 28%),
    radial-gradient(circle at 84% 22%, rgba(47, 143, 131, 0.13), transparent 30%),
    linear-gradient(118deg, rgba(184, 146, 99, 0.24), rgba(247, 239, 216, 0.42) 45%, rgba(232, 216, 184, 0.62));
  pointer-events: none;
  z-index: -3;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 20;
  pointer-events: none;
  opacity: 0.22;
  mix-blend-mode: multiply;
  background-image:
    radial-gradient(circle at 12% 18%, rgba(23,18,13,.55) 0 1px, transparent 1px),
    radial-gradient(circle at 72% 42%, rgba(58,39,24,.45) 0 1px, transparent 1px),
    radial-gradient(circle at 38% 78%, rgba(29,92,87,.35) 0 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,18,13,.05) 1px, transparent 1px);
  background-size: 19px 23px, 31px 29px, 43px 41px, 7px 7px;
  animation: grainBreath 7s ease-in-out infinite alternate;
}

.salt-map {
  position: fixed;
  inset: -10%;
  z-index: -2;
  opacity: .28;
  background:
    radial-gradient(ellipse at 30% 40%, transparent 0 18%, rgba(29,92,87,.24) 18.4% 18.8%, transparent 19.4% 26%, rgba(29,92,87,.18) 26.5% 26.9%, transparent 27.5%),
    radial-gradient(ellipse at 72% 64%, transparent 0 14%, rgba(184,146,99,.36) 14.5% 14.9%, transparent 15.6% 23%, rgba(184,146,99,.24) 23.5% 24%, transparent 24.6%);
}

.study-table { width: 100%; }

.viewport {
  min-height: 100vh;
  position: relative;
  padding: clamp(28px, 5vw, 72px);
  isolation: isolate;
  transform-style: preserve-3d;
}

.sheet, .field-note, .practice-card, .tracing-panel, .cropped-note, .torn-tab {
  box-shadow: 0 22px 48px rgba(23, 18, 13, .18), 0 2px 0 rgba(58,39,24,.18);
}

.sheet, .field-note, .practice-card {
  background:
    linear-gradient(95deg, rgba(255,255,255,.22), transparent 32%),
    repeating-linear-gradient(0deg, transparent 0 31px, rgba(184,146,99,.18) 32px 33px),
    var(--aged-paper);
  border: 1px solid rgba(58,39,24,.22);
}

.opening { min-height: 106vh; }

.paper-field {
  width: min(78vw, 980px);
  min-height: 65vh;
  padding: clamp(34px, 5vw, 74px);
  transform: rotate(-2.4deg);
  margin: 3vh 0 0 4vw;
  position: relative;
}

.paper-field::before, .atlas-sheet::before, .map-sheet::before, .glossary-card::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px dashed rgba(58,39,24,.25);
  pointer-events: none;
}

.stamp, .chapter-no, .label, .practice-card span, .tracing-panel span {
  font-family: var(--heading);
  text-transform: uppercase;
  letter-spacing: .12em;
  font-size: 12px;
  color: var(--teal-shadow);
  font-weight: 700;
}

.misprint {
  position: relative;
  font-family: var(--heading);
  font-size: clamp(58px, 13vw, 182px);
  line-height: .88;
  margin: 10vh 0 24px;
  color: var(--dark-silt);
  letter-spacing: -.045em;
}

.misprint::before, .misprint::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  pointer-events: none;
  mix-blend-mode: multiply;
}

.misprint::before { color: var(--coral); transform: translate(3px, -2px); opacity: .45; }
.misprint::after { color: var(--lagoon-green); transform: translate(-4px, 3px); opacity: .35; }

.thesis {
  max-width: 620px;
  font-size: clamp(18px, 2.2vw, 30px);
  line-height: 1.35;
  margin: 0;
}

.coral-rule {
  width: min(440px, 60%);
  height: 5px;
  background: var(--coral);
  margin-top: 34px;
  transform-origin: left center;
  transform: scaleX(0) rotate(-1deg);
}

.coral-rule.is-visible { transform: scaleX(1) rotate(-1deg); transition: transform 1.4s cubic-bezier(.2,.8,.2,1); }

.tracing-panel {
  position: absolute;
  top: 18vh;
  right: 8vw;
  width: 300px;
  padding: 22px 24px;
  background: rgba(247,239,216,.58);
  border: 1px solid rgba(29,92,87,.35);
  backdrop-filter: blur(2px);
  transform: rotate(4deg);
}

.tracing-panel p { margin: 12px 0 0; font-family: var(--serif); font-style: italic; font-size: 22px; }

.field-note {
  position: absolute;
  right: 11vw;
  bottom: 10vh;
  width: min(360px, 70vw);
  padding: 28px;
  transform: rotate(3deg);
}

.pin {
  position: absolute;
  top: 12px;
  right: 18px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 2px 0 var(--deep-sepia);
}

h2, h3 { font-family: var(--heading); line-height: 1; margin: 10px 0 18px; color: var(--dark-silt); }
h2 { font-size: clamp(46px, 7vw, 106px); letter-spacing: -.04em; }
h3 { font-size: clamp(24px, 3vw, 42px); letter-spacing: -.03em; }
p { line-height: 1.55; }

.fish-layer { position: absolute; pointer-events: none; overflow: visible; z-index: 2; }
.fish-layer-one { width: 72vw; height: auto; left: 12vw; top: 19vh; mix-blend-mode: multiply; }
.fish-layer-two { width: 64vw; left: 12vw; bottom: 11vh; }

.fish path { fill: rgba(47,143,131,.74); stroke: var(--deep-sepia); stroke-width: 2; vector-effect: non-scaling-stroke; }
.fish-b path, .fish-e path { fill: rgba(217,110,79,.66); }
.fish-c path, .fish-d path { fill: rgba(184,146,99,.76); }
.fish circle { fill: var(--dark-silt); }
.swim-line, .route, .contour { fill: none; stroke: var(--lagoon-green); stroke-width: 3; stroke-linecap: round; stroke-dasharray: 3 12; opacity: .78; }
.route { stroke: var(--coral); stroke-dasharray: none; }
.route.dotted { stroke: var(--teal-shadow); stroke-dasharray: 2 14; }
.contour { stroke: var(--teal-shadow); stroke-width: 2; stroke-dasharray: none; opacity: .58; }
.contour.thin { stroke-width: 1.4; opacity: .42; }

.specimen-label {
  position: absolute;
  right: 5vw;
  top: 55vh;
  font-family: var(--serif);
  font-style: italic;
  color: var(--deep-sepia);
  transform: rotate(-8deg);
}

.hole-column { position: absolute; left: 28px; top: 22vh; display: grid; gap: 42px; }
.hole-column i { width: 18px; height: 18px; border-radius: 50%; background: var(--cream); border: 1px solid rgba(58,39,24,.25); box-shadow: inset 0 2px 5px rgba(23,18,13,.16); }

.margin-nav {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 30;
  display: grid;
  gap: 8px;
}

.margin-nav a {
  font-family: var(--heading);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--deep-sepia);
  text-decoration: none;
  background: rgba(247,239,216,.72);
  border: 1px solid rgba(58,39,24,.18);
  padding: 7px 9px;
  transform: rotate(-2deg);
}

.chapter { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(14px, 2vw, 26px); align-items: center; }
.vertical-strip {
  grid-column: 1 / 2;
  align-self: stretch;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  background: var(--notebook-tan);
  color: var(--cream);
  padding: 22px 12px;
  font-family: var(--heading);
  letter-spacing: .08em;
  transform: rotate(.8deg);
}

.map-sheet { grid-column: 2 / 7; padding: clamp(28px, 4vw, 56px); transform: rotate(2deg); position: relative; z-index: 2; }
.quote { font-family: var(--serif); font-style: italic; font-size: 24px; color: var(--teal-shadow); }
.current-diagram { grid-column: 6 / 13; position: relative; min-height: 62vh; transform: rotate(-2deg); }
.current-diagram svg { width: 100%; height: 100%; }
.map-note { position: absolute; background: rgba(247,239,216,.76); border: 1px solid rgba(58,39,24,.2); padding: 10px 14px; font-family: var(--serif); font-style: italic; }
.note-a { left: 8%; top: 12%; transform: rotate(-5deg); }
.note-b { right: 7%; bottom: 20%; transform: rotate(4deg); }
.edge-question { grid-column: 9 / 13; align-self: end; font-size: 20px; border-left: 5px solid var(--coral); padding-left: 18px; }

.margins { background: linear-gradient(180deg, rgba(232,216,184,.2), rgba(184,146,99,.18)); overflow: hidden; }
.glossary-card { grid-column: 4 / 10; padding: clamp(30px, 4vw, 58px); transform: rotate(-3deg); position: relative; z-index: 3; }
dl { display: grid; grid-template-columns: 1fr 2fr; gap: 18px 26px; font-size: 19px; }
dt { font-family: var(--heading); font-weight: 700; color: var(--teal-shadow); border-bottom: 3px solid var(--coral); }
dd { margin: 0; }
.torn-tab { position: absolute; background: var(--coral); color: var(--cream); font-family: var(--heading); padding: 14px 26px; font-weight: 700; }
.tab-a { left: -8px; top: 16vh; transform: rotate(-7deg); }
.tab-b { right: -18px; bottom: 20vh; transform: rotate(8deg); }
.cropped-note { grid-column: 1 / 5; align-self: end; background: rgba(247,239,216,.76); padding: 28px; font-family: var(--serif); font-style: italic; font-size: 24px; transform: translateX(-42px) rotate(4deg); }
.scale-divider { position: absolute; right: 11vw; top: 16vh; display: flex; gap: 6px; transform: rotate(14deg); }
.scale-divider span { width: 20px; height: 38px; border-radius: 60% 40% 60% 40%; background: var(--lagoon-green); opacity: .55; }

.practice { overflow: hidden; }
.practice-title { grid-column: 1 / 6; align-self: start; margin-top: 8vh; }
.practice-title p { max-width: 420px; font-size: 20px; }
.practice-card {
  position: relative;
  min-height: 270px;
  padding: 28px;
  transform-style: preserve-3d;
  will-change: transform;
}
.card-one { grid-column: 6 / 10; transform: rotate(-4deg); }
.card-two { grid-column: 3 / 7; transform: rotate(3deg); margin-top: 38vh; }
.card-three { grid-column: 8 / 12; transform: rotate(5deg); margin-top: 18vh; }
.practice-card::after, .field-note::after {
  content: "";
  position: absolute;
  inset: auto 14px 10px 14px;
  height: 4px;
  background: var(--notebook-tan);
  opacity: .4;
}
.tide-fill { position: absolute; left: 0; right: 0; bottom: 0; height: 0; background: linear-gradient(0deg, rgba(47,143,131,.28), rgba(47,143,131,0)); z-index: -1; transition: height .25s linear; }

.closing { min-height: 105vh; display: grid; place-items: center; }
.atlas-sheet { width: min(760px, 78vw); padding: clamp(36px, 5vw, 68px); transform: rotate(1.5deg); position: relative; z-index: 2; }
.atlas-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 30px; }
.atlas-grid span { border: 1px solid rgba(58,39,24,.22); padding: 14px; background: rgba(247,239,216,.45); font-family: var(--serif); font-style: italic; }
.reef-map { position: absolute; width: min(92vw, 1000px); opacity: .74; mix-blend-mode: multiply; }

.tilt-card { transition: transform .18s ease-out; transform-style: preserve-3d; }
.reveal { opacity: 0; translate: 0 34px; transition: opacity .9s ease, translate .9s ease; }
.reveal.is-visible { opacity: 1; translate: 0 0; }

@keyframes grainBreath { from { opacity: .16; transform: translate3d(0,0,0); } to { opacity: .29; transform: translate3d(-1.5%, 1%, 0); } }

@media (max-width: 820px) {
  .viewport { padding: 24px; min-height: auto; }
  .opening, .closing { min-height: 100vh; }
  .paper-field { width: 92vw; min-height: 62vh; margin: 4vh 0 0; }
  .tracing-panel, .field-note, .specimen-label { position: relative; inset: auto; margin: 24px 0 0 auto; }
  .fish-layer-one, .fish-layer-two { width: 110vw; left: -8vw; }
  .chapter { display: block; }
  .vertical-strip { writing-mode: initial; margin-bottom: 20px; }
  .map-sheet, .glossary-card, .cropped-note, .practice-title, .practice-card { margin: 22px 0; width: 100%; }
  .current-diagram { min-height: 360px; }
  .card-one, .card-two, .card-three { margin-top: 22px; }
  .margin-nav { display: none; }
  .atlas-grid { grid-template-columns: 1fr; }
}