:root {
    /* Typography compliance text: IBM Plex Mono to distinguish narrative history from both conventional editorial layouts and graphing-app interfaces. Source Serif 4** for longer explanatory notes. Space Grotesk legends that feel like engraved labels on a scientific instrument. Space Grotesk** for modern interface labels and graph legends. */
    --obsidian: #101015;
    --violet: #6C5BA7;
    --vellum: #E8D7B2;
    --brass: #B98A3B;
    --cinnabar: #B33A2E;
    --ink-blue: #1D3142;
    --verdigris: #4F7F6A;
    --bone: #F6F0E4;
    --display: 'Fraunces', serif;
    --serif: 'Source Serif 4', serif;
    --sans: 'Space Grotesk', sans-serif;
    --mono: 'IBM Plex Mono', monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    min-height: 100vh;
    overflow-x: hidden;
    color: var(--bone);
    background:
        radial-gradient(circle at 18% 10%, rgba(108, 91, 167, .22), transparent 32vw),
        radial-gradient(circle at 82% 35%, rgba(79, 127, 106, .16), transparent 34vw),
        linear-gradient(132deg, #101015 0%, #121521 42%, #0b0b10 100%);
    font-family: var(--serif);
}

.grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 20;
    opacity: .2;
    background-image:
        repeating-radial-gradient(circle at 12% 18%, rgba(246, 240, 228, .08) 0 1px, transparent 1px 7px),
        repeating-linear-gradient(92deg, transparent 0 11px, rgba(232, 215, 178, .03) 12px 13px);
    mix-blend-mode: overlay;
}

.instrument-rail {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 15;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 24px;
    align-items: center;
    padding: 18px 28px;
    font-family: var(--sans);
    font-size: 12px;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: rgba(246, 240, 228, .78);
    background: linear-gradient(180deg, rgba(16,16,21,.94), rgba(16,16,21,.35), transparent);
}

.brand-mark { color: var(--vellum); font-weight: 700; }
.accession { justify-self: end; font-family: var(--mono); color: var(--brass); }
.chapter-tabs { display: flex; gap: 16px; }
.chapter-tabs a { color: rgba(246, 240, 228, .7); text-decoration: none; transition: color .3s ease; }
.chapter-tabs a:hover { color: var(--brass); }

.chronometer {
    position: fixed;
    right: 26px;
    bottom: 24px;
    z-index: 16;
    width: 92px;
    height: 92px;
    border: 1px solid rgba(185, 138, 59, .58);
    border-radius: 50%;
    display: grid;
    place-items: center;
    color: var(--brass);
    font: 10px var(--mono);
    letter-spacing: .18em;
    background: rgba(16, 16, 21, .72);
    box-shadow: 0 0 28px rgba(185, 138, 59, .12), inset 0 0 22px rgba(232, 215, 178, .04);
}

.chrono-face {
    position: absolute;
    inset: 9px;
    border-radius: 50%;
    background: repeating-conic-gradient(from 0deg, rgba(185,138,59,.58) 0 1deg, transparent 1deg 12deg);
    opacity: .55;
}

.chrono-hand {
    position: absolute;
    width: 1px;
    height: 35px;
    background: var(--cinnabar);
    transform-origin: 50% 100%;
    transform: translateY(-17px) rotate(0deg);
}

.chronograph-table { position: relative; }

.era-plate {
    position: relative;
    min-height: 100vh;
    padding: 100px 7vw 70px;
    overflow: hidden;
}

.era-plate::before {
    content: '';
    position: absolute;
    inset: 6vh 3vw;
    background-image:
        linear-gradient(rgba(232, 215, 178, .065) 1px, transparent 1px),
        linear-gradient(90deg, rgba(232, 215, 178, .045) 1px, transparent 1px);
    background-size: 62px 62px, 62px 62px;
    transform: perspective(800px) rotateX(56deg) rotateZ(-4deg) scale(1.18);
    transform-origin: top center;
    opacity: .82;
}

.hero { display: grid; grid-template-columns: minmax(0, 1fr) 390px; gap: 36px; align-items: center; }

.coordinate-spine {
    position: absolute;
    left: 5vw;
    top: 14vh;
    bottom: 11vh;
    z-index: 3;
    width: 34px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    font: 11px var(--mono);
    color: rgba(185, 138, 59, .82);
    border-left: 1px solid rgba(185, 138, 59, .45);
    transform: skewY(-10deg);
}

.coordinate-spine span { transform: translateX(10px) rotate(-6deg); }

.drafting-surface {
    position: relative;
    z-index: 2;
    height: 72vh;
    min-height: 560px;
    border: 1px solid rgba(185, 138, 59, .28);
    background:
        radial-gradient(circle at 52% 44%, rgba(232, 215, 178, .08), transparent 19%),
        linear-gradient(120deg, rgba(29,49,66,.48), rgba(16,16,21,.48));
    box-shadow: 0 38px 80px rgba(0,0,0,.48), inset 0 0 80px rgba(0,0,0,.45);
    transform: perspective(1000px) rotateX(51deg) rotateZ(-5deg) translateY(3vh);
    transform-origin: center top;
}

.monumental-year {
    position: absolute;
    left: 6%;
    top: -16%;
    font: 900 clamp(140px, 20vw, 310px)/.8 var(--display);
    color: rgba(232, 215, 178, .055);
    letter-spacing: -.08em;
}

.history-graph { position: absolute; inset: 3%; overflow: visible; }
.axis, .graph-path { fill: none; stroke-linecap: round; stroke-linejoin: round; filter: url(#inkBleed); }
.axis-main { stroke: rgba(185, 138, 59, .36); stroke-width: 2; stroke-dasharray: 10 14; }
.graph-path { stroke-width: 5; stroke-dasharray: 1600; stroke-dashoffset: 1600; animation: drawPath 3.2s cubic-bezier(.54,.01,.2,1) forwards; }
.graph-path.green { stroke: var(--verdigris); animation-delay: .7s; }
.graph-path.violet { stroke: var(--violet); animation-delay: 1.05s; }
.graph-path.brass { stroke: var(--brass); animation-delay: .35s; }
.graph-path.red { stroke: var(--cinnabar); stroke-width: 3; animation-delay: 1.55s; }
.graph-path.emphasized { stroke-width: 9; filter: drop-shadow(0 0 12px currentColor); }

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

.ticks line { stroke: var(--brass); stroke-width: 2; opacity: .72; animation: calibrate .9s ease both; transform-origin: center; }
@keyframes calibrate { from { transform: scaleY(0); opacity: 0; } to { transform: scaleY(1); opacity: .72; } }

.knot { fill: var(--cinnabar); stroke: var(--vellum); stroke-width: 2; cursor: pointer; filter: drop-shadow(0 0 10px rgba(179,58,46,.8)); animation: pulseKnot 2.5s ease-in-out infinite; }
@keyframes pulseKnot { 50% { r: 17px; opacity: .82; } }

.divider { position: absolute; top: 36%; width: 2px; height: 210px; background: linear-gradient(var(--brass), rgba(185,138,59,.18)); transform-origin: top; box-shadow: 0 0 14px rgba(185,138,59,.35); }
.divider::before { content: ''; position: absolute; top: -9px; left: -7px; width: 16px; height: 16px; border: 1px solid var(--brass); border-radius: 50%; background: var(--obsidian); }
.divider-left { left: 43%; transform: rotate(18deg); }
.divider-right { left: 46%; transform: rotate(-22deg); }
.glowing-year-mark { position: absolute; left: 41%; top: 55%; color: var(--bone); font: 600 19px var(--mono); text-shadow: 0 0 18px var(--brass), 0 0 30px var(--brass); }

.drag-lens {
    position: absolute;
    left: 58%;
    top: 35%;
    width: 180px;
    height: 122px;
    border: 1px solid rgba(246, 240, 228, .66);
    border-radius: 50%;
    background: radial-gradient(circle, rgba(232,215,178,.18), rgba(108,91,167,.08) 62%, transparent 70%);
    box-shadow: inset 0 0 32px rgba(246,240,228,.12), 0 18px 30px rgba(0,0,0,.35);
    cursor: grab;
}
.drag-lens span { position: absolute; inset: auto 0 22px; text-align: center; font: 10px var(--mono); letter-spacing: .2em; color: var(--vellum); }
.drag-lens.dragging { cursor: grabbing; }

.knot-note {
    position: absolute;
    right: 4%;
    bottom: 7%;
    width: 280px;
    padding: 15px 17px;
    color: var(--obsidian);
    background: rgba(232, 215, 178, .86);
    border-left: 4px solid var(--cinnabar);
    font: 15px/1.35 var(--serif);
    transform: rotate(1.5deg);
}

.instrument-label, .plate-copy, .final-statement {
    position: relative;
    z-index: 4;
    padding: 28px;
    background: linear-gradient(135deg, rgba(232,215,178,.88), rgba(232,215,178,.62));
    color: var(--obsidian);
    box-shadow: 0 18px 45px rgba(0,0,0,.28);
    border: 1px solid rgba(185,138,59,.48);
}

.hero-label { transform: rotate(2deg); align-self: end; margin-bottom: 7vh; }
.label-kicker { display: block; margin-bottom: 12px; font: 700 12px var(--sans); letter-spacing: .2em; text-transform: uppercase; color: var(--cinnabar); }
h1, h2 { margin: 0; font-family: var(--display); font-weight: 760; line-height: .95; letter-spacing: -.04em; }
h1 { font-size: clamp(46px, 6vw, 82px); }
h2 { font-size: clamp(42px, 5.5vw, 76px); }
p { font-size: 18px; line-height: 1.55; margin: 18px 0 0; }

.diagonal { display: grid; grid-template-columns: .85fr 1.15fr; align-items: center; transform: skewY(-3deg); background: linear-gradient(150deg, rgba(29,49,66,.38), transparent 48%); }
.diagonal > * { transform: skewY(3deg); }
.clipped-label { max-width: 570px; clip-path: polygon(0 0, 94% 0, 100% 18%, 96% 100%, 0 100%); }
.vellum-stack { position: relative; z-index: 3; height: 520px; }
.vellum { position: absolute; width: 62%; height: 68%; border: 1px solid rgba(232,215,178,.55); background: rgba(232,215,178,.18); backdrop-filter: blur(2px); box-shadow: 0 22px 50px rgba(0,0,0,.24); }
.vellum::before { content: ''; position: absolute; inset: 0; background-image: linear-gradient(rgba(16,16,21,.16) 1px, transparent 1px), linear-gradient(90deg, rgba(16,16,21,.12) 1px, transparent 1px); background-size: 38px 38px; }
.vellum span { position: absolute; left: 22px; bottom: 18px; color: var(--obsidian); font: 600 13px var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.plate-one { left: 5%; top: 12%; transform: rotate(-9deg); }
.plate-two { left: 24%; top: 4%; transform: rotate(5deg); background: rgba(108,91,167,.18); }
.plate-three { left: 34%; top: 24%; transform: rotate(-2deg); background: rgba(79,127,106,.18); }
.caliper-block { position: absolute; right: 12vw; bottom: 13vh; z-index: 5; color: var(--brass); font: 13px var(--mono); letter-spacing: .15em; }
.caliper-block i { display: inline-block; width: 2px; height: 88px; margin: 0 24px; background: var(--brass); transform: rotate(15deg); }
.caliper-block i + i { transform: rotate(-15deg); }

.collision { display: grid; grid-template-columns: 1.2fr .8fr; align-items: center; }
.collision-field { position: relative; z-index: 3; height: 640px; }
.red-thread { position: absolute; height: 2px; background: var(--cinnabar); transform-origin: left center; box-shadow: 0 0 15px rgba(179,58,46,.5); }
.thread-a { width: 72%; left: 12%; top: 46%; transform: rotate(-24deg); }
.thread-b { width: 68%; left: 15%; top: 36%; transform: rotate(31deg); }
.event-cluster { position: absolute; width: 165px; height: 165px; border-radius: 50%; display: grid; place-items: center; text-align: center; padding: 22px; background: radial-gradient(circle, rgba(179,58,46,.86), rgba(179,58,46,.2) 42%, transparent 70%); color: var(--bone); font-family: var(--serif); }
.event-cluster b { display: block; font: 760 36px var(--display); color: var(--vellum); }
.event-cluster span { font-size: 13px; }
.cluster-one { left: 4%; top: 50%; }.cluster-two { left: 34%; top: 18%; }.cluster-three { left: 54%; top: 58%; }.cluster-four { left: 78%; top: 29%; }
.right-label { background: linear-gradient(135deg, rgba(29,49,66,.92), rgba(16,16,21,.82)); color: var(--bone); border-color: rgba(108,91,167,.72); }

.uncertainty { display: grid; grid-template-columns: 1fr 320px .8fr; gap: 28px; align-items: center; }
.scrape-panel { position: relative; z-index: 3; height: 430px; border: 1px solid rgba(232,215,178,.5); background: rgba(232,215,178,.16); overflow: hidden; cursor: crosshair; }
.scrape-top, .scrape-under { position: absolute; inset: 0; display: grid; place-items: center; padding: 44px; text-align: center; font-family: var(--display); font-size: clamp(36px, 5vw, 74px); line-height: 1; }
.scrape-top { color: var(--vellum); background: linear-gradient(135deg, rgba(29,49,66,.94), rgba(16,16,21,.92)); clip-path: circle(var(--scrape, 18%) at var(--scrape-x, 50%) var(--scrape-y, 50%)); }
.scrape-under { color: var(--obsidian); background: var(--vellum); font-family: var(--serif); font-size: 34px; }
.marginalia { position: relative; z-index: 4; font: 14px var(--mono); color: var(--brass); }
.marginalia p { border-bottom: 1px dotted rgba(185,138,59,.5); transform: rotate(-4deg); margin: 34px 0; font-size: 14px; }
.marginalia p:nth-child(2) { transform: rotate(3deg); color: var(--violet); }
.marginalia p:nth-child(3) { transform: rotate(-1deg); color: var(--verdigris); }
.uncertainty-copy { background: rgba(232,215,178,.8); }

.finale { display: grid; place-items: center; text-align: center; }
.atlas-glow { position: absolute; z-index: 2; width: min(86vw, 980px); height: 66vh; border-radius: 50%; background: radial-gradient(circle, rgba(246,240,228,.12), rgba(108,91,167,.1) 45%, transparent 70%); }
.contour { position: absolute; border: 1px solid rgba(232,215,178,.24); border-radius: 46% 54% 62% 38%; inset: 10%; animation: rotatePlate 28s linear infinite; }
.c2 { inset: 20%; border-color: rgba(79,127,106,.48); animation-duration: 20s; animation-direction: reverse; }.c3 { inset: 31%; border-color: rgba(185,138,59,.45); animation-duration: 34s; }
@keyframes rotatePlate { to { transform: rotate(360deg); } }
.atlas-line { position: absolute; left: 18%; top: 50%; width: 64%; height: 2px; background: linear-gradient(90deg, transparent, var(--brass), var(--verdigris), var(--violet), transparent); transform-origin: center; box-shadow: 0 0 18px rgba(246,240,228,.32); }
.l1 { transform: rotate(12deg); }.l2 { transform: rotate(58deg); }.l3 { transform: rotate(-34deg); }.l4 { transform: rotate(-72deg); }
.atlas-date { position: absolute; font: 600 13px var(--mono); color: var(--vellum); }.d1 { left: 12%; top: 24%; }.d2 { right: 16%; top: 19%; }.d3 { left: 22%; bottom: 17%; }.d4 { right: 25%; bottom: 24%; }
.final-statement { max-width: 760px; background: linear-gradient(135deg, rgba(232,215,178,.9), rgba(246,240,228,.72)); }

.era-plate.in-view .vellum { animation: stampIn 1.1s cubic-bezier(.2,.8,.2,1) both; }
.era-plate.in-view .event-cluster { animation: stampIn .8s cubic-bezier(.2,.8,.2,1) both; }
@keyframes stampIn { from { opacity: 0; transform: translateY(30px) rotate(-12deg) scale(.92); } }

@media (max-width: 900px) {
    .instrument-rail { grid-template-columns: 1fr; gap: 10px; }
    .chapter-tabs { flex-wrap: wrap; }
    .accession { justify-self: start; }
    .hero, .diagonal, .collision, .uncertainty { grid-template-columns: 1fr; }
    .drafting-surface { min-height: 470px; transform: perspective(900px) rotateX(42deg) rotateZ(-4deg); }
    .hero-label { margin: 0; }
    .vellum-stack, .collision-field { height: 480px; }
}