:root {
  --ink: #111827;
  --verdigris: #2E7D75;
  --vellum: #F1E3C4;
  --amber: #D89B3D;
  --oxblood: #7A263A;
  --violet: #33213A;
  --copper: #8FAE9B;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--vellum);
  background: var(--ink);
  font-family: "Commissioner", system-ui, sans-serif;
  overflow-x: hidden;
}

.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 40;
  opacity: .22;
  background-image: radial-gradient(circle at 20% 20%, rgba(241,227,196,.18) 0 1px, transparent 1px), radial-gradient(circle at 70% 80%, rgba(216,155,61,.12) 0 1px, transparent 1px);
  background-size: 28px 24px, 41px 37px;
  mix-blend-mode: overlay;
}

.cursor-lens {
  position: fixed;
  width: 160px;
  height: 160px;
  border: 1px solid rgba(216,155,61,.42);
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 35;
  opacity: .45;
  background: radial-gradient(circle, rgba(241,227,196,.08), transparent 65%);
  box-shadow: 0 0 45px rgba(216,155,61,.18), inset 0 0 24px rgba(46,125,117,.18);
}

.folio-nav {
  position: fixed;
  top: 28px;
  right: 30px;
  z-index: 45;
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 9px 12px;
  background: rgba(17,24,39,.62);
  border: 1px solid rgba(216,155,61,.45);
  transform: skewX(-12deg);
}
.folio-nav > * { transform: skewX(12deg); }
.folio-nav a, .seal {
  color: var(--vellum);
  text-decoration: none;
  font: 650 12px/1 "Commissioner";
  letter-spacing: .16em;
}
.seal { color: var(--amber); font-family: "Grenze Gotisch", serif; font-size: 20px; }

.chapter {
  min-height: 100vh;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 8vh 7vw;
  display: grid;
  align-items: center;
}
.chapter::before {
  content: "";
  position: absolute;
  inset: -18% -8%;
  background: linear-gradient(118deg, transparent 0 16%, rgba(216,155,61,.11) 16% 17.3%, transparent 17.3% 45%, rgba(46,125,117,.16) 45% 59%, transparent 59% 100%);
  transform: translateY(var(--drift, 0px));
  z-index: -1;
}
.observatory { background: radial-gradient(circle at 78% 20%, rgba(216,155,61,.2), transparent 28%), linear-gradient(145deg, var(--ink), var(--violet)); }
.crossing { background: linear-gradient(155deg, var(--violet) 0 42%, var(--ink) 42% 100%); }
.cabinet { background: radial-gradient(circle at 24% 40%, rgba(46,125,117,.24), transparent 27%), linear-gradient(24deg, var(--ink), var(--violet)); }
.theatre { background: linear-gradient(132deg, #0d1420, var(--ink) 52%, var(--violet)); }
.rooftop { background: radial-gradient(circle at 60% 12%, rgba(241,227,196,.18), transparent 18%), linear-gradient(160deg, var(--violet), var(--ink)); }

.layer { position: absolute; will-change: transform; }
.skyline, .rooftops {
  left: -6vw;
  right: -6vw;
  bottom: 0;
  height: 34vh;
  opacity: .62;
  background: linear-gradient(to top, #060912, transparent), repeating-linear-gradient(90deg, transparent 0 34px, rgba(143,174,155,.32) 34px 38px, transparent 38px 74px), linear-gradient(135deg, transparent 0 40%, rgba(241,227,196,.08) 40% 45%, transparent 45%);
  clip-path: polygon(0 55%, 7% 38%, 12% 48%, 18% 25%, 25% 42%, 33% 24%, 39% 50%, 48% 31%, 53% 46%, 61% 20%, 68% 44%, 76% 30%, 82% 53%, 91% 26%, 100% 45%, 100% 100%, 0 100%);
}
.gas-beam { inset: -15% 5% auto auto; width: 32vw; height: 125vh; background: linear-gradient(90deg, transparent, rgba(216,155,61,.28), transparent); transform: rotate(25deg); filter: blur(2px); }
.desk-map { width: min(640px, 62vw); right: 5vw; top: 18vh; transform: rotate(-11deg); filter: drop-shadow(0 30px 45px rgba(0,0,0,.45)); }
.desk-map svg { width: 100%; }
.map-wash { fill: rgba(241,227,196,.86); stroke: var(--amber); stroke-width: 3; }
.map-lines path, .windows { fill: none; stroke: var(--verdigris); stroke-width: 2; opacity: .75; }
.red-thread { fill: none; stroke: var(--oxblood); stroke-width: 4; stroke-linecap: round; stroke-dasharray: 780; stroke-dashoffset: var(--thread-offset, 0); }
.thread-knot { fill: var(--oxblood); stroke: var(--vellum); stroke-width: 2; }

@keyframes gaslampPulse {
  0%, 100% { opacity: .48; filter: blur(2px); }
  50% { opacity: .86; filter: blur(5px); }
}

@keyframes scholarlyDrift {
  0%, 100% { background-position: 0 0, 0 0; }
  50% { background-position: 18px -12px, -22px 16px; }
}

@keyframes sealPress {
  0%, 100% { transform: rotate(-14deg) scale(1); }
  50% { transform: rotate(-10deg) scale(1.05); }
}

.gas-beam { animation: gaslampPulse 6s ease-in-out infinite; }
.grain { animation: scholarlyDrift 14s ease-in-out infinite; }

.brass-instrument { width: 260px; height: 260px; right: 13vw; bottom: 10vh; border: 2px solid var(--amber); border-radius: 50%; opacity: .82; }
.brass-instrument span, .lens-ring span { position: absolute; inset: 18%; border: 1px solid rgba(216,155,61,.7); border-radius: 50%; }
.brass-instrument span:nth-child(2) { inset: 34%; border-color: var(--verdigris); }
.brass-instrument span:nth-child(3) { inset: 49%; background: var(--amber); }

.slanted-panel {
  position: relative;
  max-width: 720px;
  padding: clamp(34px, 5vw, 72px);
  background: linear-gradient(135deg, rgba(241,227,196,.95), rgba(241,227,196,.82));
  color: var(--ink);
  border: 2px solid var(--amber);
  box-shadow: 0 35px 90px rgba(0,0,0,.48), inset 0 0 0 8px rgba(122,38,58,.08);
  clip-path: polygon(7% 0, 100% 0, 93% 100%, 0 100%);
}
.slanted-panel::after {
  content: "";
  position: absolute;
  inset: 15px;
  border: 1px solid rgba(122,38,58,.32);
  clip-path: inherit;
  pointer-events: none;
}
.hero-panel { margin-left: 4vw; }
.left-panel { margin-left: 42vw; }
.right-panel { margin-left: 8vw; justify-self: start; }
.lecture-panel { margin-left: 46vw; }
.final-panel { margin: auto; text-align: center; }

.eyebrow {
  margin: 0 0 16px;
  color: var(--oxblood);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .22em;
  text-transform: uppercase;
}
h1, h2 { font-family: "Cormorant Garamond", Georgia, serif; font-weight: 700; line-height: .9; margin: 0 0 22px; color: var(--violet); }
h1 { font-size: clamp(68px, 12vw, 168px); letter-spacing: -.055em; }
h2 { font-size: clamp(46px, 7vw, 104px); }
.lede, .slanted-panel p:not(.eyebrow) { font-size: clamp(17px, 1.6vw, 23px); line-height: 1.55; }
.chapter-num { position: absolute; right: 35px; top: 18px; font: 700 86px/1 "Cormorant Garamond"; color: rgba(122,38,58,.18); }

.vellum-note, .equation-slip {
  position: absolute;
  max-width: 280px;
  padding: 18px 22px;
  background: rgba(241,227,196,.88);
  color: var(--violet);
  border: 1px solid var(--amber);
  font-size: 13px;
  line-height: 1.45;
  transform: rotate(8deg);
  box-shadow: 0 20px 45px rgba(0,0,0,.32);
}
.note-a { left: 58vw; top: 11vh; }
.equation-slip { left: 12vw; bottom: 13vh; transform: rotate(-12deg); font-family: "Grenze Gotisch", serif; font-size: 25px; color: var(--oxblood); }

.tramlines { inset: 0; transform: rotate(-13deg); }
.tramlines span { position: absolute; left: -20%; right: -20%; height: 2px; background: linear-gradient(90deg, transparent, var(--amber), transparent); top: calc(20% + var(--i, 0) * 14%); opacity: .65; }
.tramlines span:nth-child(2) { --i: 1; background: linear-gradient(90deg, transparent, var(--verdigris), transparent); }
.tramlines span:nth-child(3) { --i: 2; }
.tramlines span:nth-child(4) { --i: 3; background: linear-gradient(90deg, transparent, var(--oxblood), transparent); }
.city-specimen { position: absolute; left: 9vw; top: 18vh; width: 360px; padding: 26px; border: 1px solid rgba(216,155,61,.6); background: rgba(17,24,39,.45); transform: rotate(-8deg); }
.rowhouses { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; height: 160px; align-items: end; }
.rowhouses i { display: block; height: calc(82px + var(--h, 0) * 18px); border: 1px solid var(--copper); background: repeating-linear-gradient(180deg, transparent 0 17px, rgba(241,227,196,.18) 17px 24px); transition: background .35s, box-shadow .35s; }
.rowhouses i:nth-child(2), .rowhouses i:nth-child(5) { --h: 2; }
.rowhouses i:nth-child(3) { --h: 4; }
.city-specimen:hover i { background: repeating-linear-gradient(180deg, rgba(216,155,61,.55) 0 17px, rgba(241,227,196,.1) 17px 24px); box-shadow: 0 0 18px rgba(216,155,61,.45); }
.city-specimen p { color: var(--vellum); font-size: 11px; letter-spacing: .16em; text-transform: uppercase; }

.specimen-tray { right: 5vw; top: 10vh; width: 48vw; min-height: 72vh; border: 2px solid rgba(143,174,155,.55); background: rgba(46,125,117,.16); transform: rotate(8deg); display: grid; grid-template-columns: 1fr 1fr; gap: 24px; padding: 42px; box-shadow: inset 0 0 45px rgba(143,174,155,.13); }
.artifact { border: 1px solid var(--amber); background: rgba(241,227,196,.82); color: var(--violet); min-height: 180px; display: grid; place-items: center; font: 700 24px "Grenze Gotisch"; text-align: center; transition: transform .4s; }
.artifact:hover { transform: translateY(-12px) rotate(-3deg); }
.glyph { border-radius: 50% 46% 52% 48%; color: var(--oxblood); }
.ticket { grid-column: span 2; min-height: 105px; }
.wax-seal { position: absolute; left: 32vw; bottom: 16vh; width: 118px; height: 118px; display: grid; place-items: center; border-radius: 50%; background: var(--oxblood); color: var(--vellum); font: 700 30px "Grenze Gotisch"; transform: rotate(-14deg); box-shadow: 0 20px 50px rgba(0,0,0,.45); }
.wax-seal { animation: sealPress 8s ease-in-out infinite; }

.lens-ring { left: 8vw; top: 10vh; width: 430px; height: 430px; border-radius: 50%; border: 2px solid var(--amber); background: radial-gradient(circle, rgba(241,227,196,.13), rgba(46,125,117,.1) 45%, transparent 70%); }
.lecture-board { position: absolute; left: 7vw; bottom: 12vh; width: 48vw; transform: rotate(-7deg); border: 1px solid var(--copper); background: rgba(17,24,39,.72); padding: 18px; }
.lecture-board svg { width: 100%; }
.chalk { fill: none; stroke: var(--vellum); stroke-width: 4; stroke-linecap: round; opacity: .72; }
.chalk.amber { stroke: var(--amber); }.chalk.green { stroke: var(--verdigris); }
.moon-phases circle { fill: none; stroke: var(--vellum); opacity: .55; }

.constellation-thread { inset: 9vh 10vw auto auto; width: 58vw; height: 42vh; border-top: 3px solid var(--oxblood); transform: rotate(-16deg); }
.constellation-thread span { position: absolute; width: 12px; height: 12px; background: var(--oxblood); border: 2px solid var(--vellum); border-radius: 50%; top: -8px; left: var(--x, 0); }
.constellation-thread span:nth-child(2) { --x: 28%; top: 40px; }.constellation-thread span:nth-child(3) { --x: 62%; top: -28px; }.constellation-thread span:nth-child(4) { --x: 92%; top: 58px; }
.index-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 28px; }
.index-grid span { border: 1px solid rgba(122,38,58,.32); padding: 12px; font-size: 11px; letter-spacing: .14em; text-transform: uppercase; }

@media (max-width: 850px) {
  .chapter { padding: 11vh 6vw; }
  .desk-map, .specimen-tray, .lecture-board { width: 88vw; opacity: .52; }
  .left-panel, .right-panel, .lecture-panel, .hero-panel { margin: 0; }
  .city-specimen, .vellum-note, .equation-slip, .brass-instrument { display: none; }
  .slanted-panel { clip-path: polygon(3% 0, 100% 0, 97% 100%, 0 100%); }
  .index-grid { grid-template-columns: 1fr; }
}