:root {
  --ink: #000;
  --text: #212121;
  --muted: #6e7174;
  --faint: #959595;
  --pill-bg: #f8f8f8;
  --pill-ink: rgba(32, 37, 42, 0.5);
  --panel: #f8f8f8;
  --rule: #e6e6e6;
  --accent: #2110ae;
  --loss: #b3261e;
  --serif: "Computer Modern Serif", "Latin Modern Roman", "Times New Roman", Times, serif;
  --brand: "Times New Roman", Tinos, Times, serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;

  /* console (light) */
  --c-line: #e3e3e3;
  --c-grid: #f5f5f5;
  --c-text: #212121;
  --c-dim: #8a8f96;
  --c-blue: #2110ae;
  --c-amber: #b26b00;
  --c-gain: #1f7a4d;
  --c-loss: #b3261e;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: #fff; color: var(--text); font-family: var(--serif); font-size: 18px; line-height: 23px; }
a { color: inherit; }

.page { padding: 0 64px 64px; }
.container { max-width: 800px; margin: 0 auto; padding-top: 64px; }

/* wordmark: tight Times */
.brand { display: flex; justify-content: center; margin: 0 0 40px; }
.wordmark {
  font-family: var(--brand); font-weight: 400; font-size: 84px; line-height: 1;
  letter-spacing: -0.055em; color: var(--ink); text-decoration: none;
  font-kerning: normal; font-feature-settings: "kern", "liga", "dlig";
}
.brand-small .wordmark { font-size: 44px; letter-spacing: -0.05em; }

h1 {
  font-family: var(--serif); font-weight: 400; font-variant: small-caps; font-size: 44px; line-height: 1.05;
  letter-spacing: -0.01em; color: var(--ink); text-align: center; margin: 0 0 104px;
}
.kicker { font-family: var(--mono); font-size: 12px; color: var(--muted); text-align: center; margin: -88px 0 88px; }

.meta-grid { display: grid; grid-template-columns: 1fr 1fr 1.25fr; gap: 16px; margin-bottom: 48px; }
.meta-label { font-family: var(--serif); font-size: 16px; line-height: 20px; margin: 0 0 10px; color: var(--text); }

.pill {
  display: inline-block; font-family: var(--mono); font-size: 12px; line-height: 20px; color: var(--pill-ink);
  background: var(--pill-bg); border: 0; border-radius: 9px; padding: 4px 8px; text-decoration: none; white-space: nowrap;
  transition: color .2s, background .2s;
}
a.pill[href]:hover { color: var(--ink); background: #efefef; }

.abstract { background: var(--panel); padding: 40px 60px; margin-bottom: 48px; text-align: center; }
.abstract h2 { font-family: var(--serif); font-size: 18px; font-weight: 700; line-height: 36px; margin: 0 0 24px; color: #333; }
.abstract p { text-align: justify; margin: 0; }

.body { text-align: justify; margin-bottom: 48px; }
.body p { margin: 0 0 18px; }
h3 { font-family: var(--serif); font-size: 18px; font-weight: 700; line-height: 36px; text-align: center; margin: 72px 0 20px; color: #333; }
.belief { margin-top: 72px !important; }
.links { display: flex; gap: 8px; flex-wrap: wrap; }
.caption { font-family: var(--serif); font-size: 14px; line-height: 19px; color: var(--muted); text-align: left; margin: 8px 0 14px; }

/* ruled list */
.uses { margin: 0 0 48px; }
.use { display: grid; grid-template-columns: 160px 1fr; gap: 24px; padding: 22px 0; border-top: 1px solid var(--rule); }
.use:last-child { border-bottom: 1px solid var(--rule); }
.use-kind { font-family: var(--mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); padding-top: 6px; }
.use-title { font-family: var(--serif); font-size: 24px; line-height: 30px; color: var(--ink); margin: 0 0 4px; }
.use-title a { text-decoration: none; }
.use-title a:hover { color: var(--accent); }
.use-desc { font-size: 16px; line-height: 21px; color: #3e3e3e; margin: 0 0 12px; }
.use-feature { margin-top: 56px; }

.btn {
  display: inline-flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: 12px; font-weight: 500; line-height: 20px;
  color: var(--ink); text-decoration: none; border: 1px solid #d6d6d6; border-radius: 3px; padding: 6px 12px; background: #fff;
  transition: border-color .2s; cursor: pointer;
}
.btn[href]:hover, button.btn:hover { border-color: var(--accent); }
.arrow { color: var(--accent); }

.footer { max-width: 800px; margin: 72px auto 0; padding-top: 40px; border-top: 1px solid var(--rule); display: flex; flex-direction: column; align-items: center; gap: 12px; }
.footer-brand { font-family: var(--brand); font-size: 30px; line-height: 1; letter-spacing: -0.05em; color: var(--ink); text-decoration: none; }
.footer-copy { font-family: var(--mono); font-size: 11px; color: var(--faint); }

/* =========================== explorable figures =========================== */
.sim { margin: 0 0 48px; }
.pg-intro { text-align: justify; margin: 0 0 22px; }
.pg-note { text-align: center; margin-top: 10px; }

/* a sentence you can edit */
.sentence { font-size: 20px; line-height: 34px; text-align: left; margin: 0 0 6px; }
.knob { display: inline-flex; align-items: center; gap: 8px; vertical-align: middle; margin: 0 2px; }
.knob b { font-family: var(--mono); font-size: 14px; font-weight: 500; color: var(--accent); padding: 0 1px; min-width: 64px; display: inline-block; white-space: nowrap; }
.knob input[type=range] { -webkit-appearance: none; appearance: none; width: 110px; height: 18px; background: transparent; margin: 0; outline: none; cursor: pointer; }
.knob input[type=range]::-webkit-slider-runnable-track { height: 2px; background: linear-gradient(90deg, var(--accent) var(--fill, 50%), #d9d9d9 var(--fill, 50%)); }
.knob input[type=range]::-moz-range-track { height: 2px; background: #d9d9d9; }
.knob input[type=range]::-moz-range-progress { height: 2px; background: var(--accent); }
.knob input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 13px; height: 13px; margin-top: -5.5px; border-radius: 50%; background: #fff; border: 2px solid var(--accent); }
.knob input[type=range]::-moz-range-thumb { width: 10px; height: 10px; border-radius: 50%; background: #fff; border: 2px solid var(--accent); }
.knob input[type=range]:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 4px rgba(33,16,174,.15); }
.chips { display: inline-flex; gap: 4px; vertical-align: middle; }
.chip { font-family: var(--mono); font-size: 12px; color: var(--muted); background: var(--pill-bg); border: 0; border-radius: 9px; padding: 3px 9px; cursor: pointer; }
.chip.active { color: #fff; background: var(--ink); }
.chip[data-regime=stressed].active { background: var(--c-amber); }

.fig { position: relative; margin: 18px 0 0; padding: 18px 0 6px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule); }
.fig canvas { display: block; width: 100%; cursor: crosshair; }
.fig-cap { font-size: 14px; line-height: 19px; color: var(--muted); margin: 8px 0 0; text-align: left; }
.canvas-wrap { position: relative; }

.readings { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin: 22px 0 6px; }
.reading-k { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; color: var(--muted); margin: 0 0 4px; text-transform: uppercase; }
.reading-v { font-family: var(--serif); font-size: 34px; line-height: 38px; color: var(--ink); margin: 0 0 6px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.reading-v.loss { color: var(--loss); }
.reading-v.gain { color: var(--c-gain); }
.reading-s { font-size: 15px; line-height: 20px; color: #3e3e3e; margin: 0; text-align: left; }
.mini-bars { display: grid; gap: 4px; margin: 6px 0 0; }
.mini-bar { display: grid; grid-template-columns: 74px 1fr 34px; align-items: center; gap: 8px; font-family: var(--mono); font-size: 10.5px; color: var(--muted); }
.mini-bar .track { height: 6px; background: #f1f1f1; }
.mini-bar .val { text-align: right; color: var(--ink); font-variant-numeric: tabular-nums; }
.mini-bar i { display: block; height: 6px; background: var(--ink); transition: width .4s; }
.mini-bar i.neg { background: var(--c-gain); }

.act-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin: 18px 0 0; font-size: 16px; }
.act-row .note { color: #3e3e3e; }
.warn-note { color: var(--c-amber); }

.tip { position: absolute; pointer-events: none; background: #fff; border: 1px solid #d9d9d9; box-shadow: 0 6px 18px -8px rgba(0,0,0,.25); color: var(--ink); font-family: var(--mono); font-size: 11px; line-height: 15px; padding: 6px 8px; border-radius: 2px; white-space: nowrap; z-index: 3; display: none; }

/* =========================== case study =========================== */
.facts { margin: 0 0 12px; padding-left: 20px; }
.facts li { margin-bottom: 10px; }
.muted { color: var(--muted); }
.tree-fig { padding-top: 14px; }
.tree svg { display: block; width: 100%; height: auto; overflow: visible; }
.tree .node { cursor: pointer; }
.tree .node:hover rect { fill: #f7f7f7; }
.tree text { font-family: var(--mono); }
.t-dim { font-size: 10.5px; fill: var(--muted); }
.t-k { font-size: 10px; letter-spacing: .12em; fill: var(--muted); }
.t-name { font-family: var(--serif) !important; font-size: 16px; fill: var(--ink); }
.t-val { font-size: 11px; font-weight: 600; fill: var(--ink); }
@keyframes draw { from { stroke-dashoffset: var(--len); } to { stroke-dashoffset: 0; } }
.summary { font-size: 18px; line-height: 25px; margin: 16px 0 6px !important; text-align: left !important; }
.summary b, .cmp b { font-weight: 700; }
b.g, td.g { color: var(--c-gain); }
b.l, td.l { color: var(--c-loss); }
.world-detail { border-left: 2px solid var(--ink); padding: 4px 0 4px 22px; text-align: left; }
.d-title { text-align: left; margin: 0 0 8px; font-size: 26px; line-height: 32px; font-weight: 400; color: var(--ink); }
.d-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; margin-top: 14px; }
.d-grid .fig { margin-top: 0; padding-top: 12px; }
.d-grid .fig canvas { cursor: crosshair; }
#d-water svg { display: block; width: 100%; height: auto; overflow: visible; }
#d-water text { font-family: var(--mono); }
#d-water .t-name { font-size: 13px; }
.d-read { font-size: 16px; line-height: 22px; margin: 16px 0 0 !important; }
.chain { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 6px 0 4px !important; }
.chain-node { font-family: var(--mono); font-size: 11.5px; border: 1px solid var(--rule); background: #fff; color: var(--ink); padding: 3px 8px; }
.chain-arrow { font-family: var(--mono); color: var(--accent); }
.sturdy-lead { font-size: 17px; line-height: 24px; margin-top: 18px !important; text-align: left !important; }
.cmp { width: 100%; border-collapse: collapse; font-size: 15px; margin: 8px 0 6px; }
.cmp th { text-align: left; font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em; font-weight: 400; color: var(--muted); border-bottom: 1px solid var(--ink); padding: 6px 8px 6px 0; }
.cmp td { padding: 7px 8px 7px 0; border-bottom: 1px solid var(--rule); font-variant-numeric: tabular-nums; }
.cmp tr.sum td { font-weight: 700; }


/* market chart: real history branching into worlds */
.market-fig { margin: 8px -140px 0; padding-top: 14px; }
.fig-head { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.fig-legend i { display: inline-block; width: 18px; height: 0; vertical-align: middle; margin: 0 6px 0 10px; }
.lg-real { border-top: 2px solid #000; }
.lg-imag { border-top: 2px solid #0f766e; opacity: .7; }
.market-fig canvas { display: block; width: 100%; }
.tip b { font-weight: 600; }

/* analyst review */
.review { margin: 40px 0 48px; border-top: 1px solid var(--ink); padding-top: 22px; scroll-margin-top: 20px; }
.review-head .d-title { text-align: left; margin: 2px 0 6px; font-size: 30px; line-height: 36px; font-weight: 400; color: var(--ink); }
.review-lead { font-size: 19px; line-height: 26px; color: #2b2b2b; margin: 0 0 18px; }
.review-grid { display: grid; grid-template-columns: 1fr 300px; gap: 36px; }
.review-text { font-size: 16px; line-height: 22px; text-align: left; }
.review-text h4 { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; font-weight: 500; color: var(--muted); margin: 18px 0 6px; }
.review-text h4:first-child { margin-top: 0; }
.review-text p { margin: 0 0 8px; }
.review-text ul { margin: 0 0 8px; padding-left: 18px; }
.review-text li { margin-bottom: 4px; }
.muted-s { font-size: 14px; line-height: 19px; color: var(--muted); }
.muted-s b { color: var(--ink); }
.review-side { border-left: 1px solid var(--rule); padding-left: 24px; }
.side-stats { margin: 6px 0 14px; }
.side-stats > div { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; padding: 7px 0; border-bottom: 1px solid #f0f0f0; }
.side-stats .reading-k { margin: 0; letter-spacing: .06em; }
.stat { font-family: var(--serif); font-size: 17px; line-height: 22px; color: var(--ink); margin: 0; text-align: right; white-space: nowrap; }
.stat.g { color: var(--c-gain); } .stat.l { color: var(--c-loss); }
.review-side .fig { margin-top: 10px; padding-top: 10px; }
#d-water svg { display: block; width: 100%; height: auto; }
#d-water text { font-family: var(--mono); }
.w-name { font-size: 11px; fill: var(--ink); }
.w-val { font-size: 10.5px; font-weight: 600; fill: var(--ink); }

/* the eighteen worlds, grouped */
.world-tabs { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 18px 28px; margin-top: 34px; padding-top: 20px; border-top: 1px solid var(--rule); }
.tab-fam .reading-k { margin-bottom: 6px; }
.wtab { display: grid; grid-template-columns: 10px 1fr auto auto; gap: 8px; align-items: center; width: 100%; text-align: left; background: none; border: 0; border-bottom: 1px solid #f0f0f0; padding: 6px 2px; cursor: pointer; font-family: var(--serif); font-size: 14.5px; color: var(--ink); }
.wtab:hover { background: #fafafa; }
.wtab.on { background: #f4f3fb; }
.wdot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; vertical-align: middle; }
.wtab .wdot { margin: 0; }
.wp { font-family: var(--mono); font-size: 10.5px; color: var(--muted); }
.wr { font-family: var(--mono); font-size: 11px; font-weight: 600; min-width: 64px; text-align: right; }
.wr.g { color: var(--c-gain); } .wr.l { color: var(--c-loss); }

@media (max-width: 1100px) { .market-fig { margin: 8px -40px 0; } }
@media (max-width: 900px) { .market-fig { margin: 8px 0 0; } .review-grid { grid-template-columns: 1fr; } .review-side { border-left: 0; padding-left: 0; border-top: 1px solid var(--rule); padding-top: 16px; } }

@media (max-width: 767px) {
  .page { padding: 0 16px 32px; }
  .container { padding-top: 40px; }
  .wordmark { font-size: 60px; }
  h1 { font-size: 34px; margin-bottom: 56px; }
  .kicker { margin: -40px 0 48px; }
  .meta-grid { grid-template-columns: 1fr; gap: 20px; }
  .abstract { padding: 28px 20px; }
  body { font-size: 17px; line-height: 22px; }
  .pill { white-space: normal; }
  .use { grid-template-columns: 1fr; gap: 6px; }
  .use-title { font-size: 21px; line-height: 26px; }
  .readings { grid-template-columns: 1fr; gap: 18px; }
  .d-grid { grid-template-columns: 1fr; }
  .world-detail { padding-left: 14px; }
  .sentence { font-size: 18px; line-height: 32px; }
}

/* ===== scroll-driven world-model walkthrough ===== */
.scrolly { position: relative; height: 1000vh; margin: 56px calc(50% - 50vw) 64px; }
.sc-stage { position: sticky; top: 0; height: 100vh; overflow: hidden; background: #fff; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.sc-stage canvas { position: absolute; inset: 0; width: 100%; display: block; }
.sc-stage::after { content: ""; position: absolute; inset: 0 auto 0 0; width: 46%; pointer-events: none;
  background: linear-gradient(90deg, rgba(255,255,255,.96) 0%, rgba(255,255,255,.86) 52%, rgba(255,255,255,0) 100%); }
.sc-cards { position: absolute; z-index: 2; left: calc(5vw + 168px); top: 50%; transform: translateY(-50%); width: min(360px, 26vw); height: 340px; }
/* an edgeless cushion behind the floating text: invisible as a shape, but nothing behind it can compete */
.sc-cards::before { content: ""; position: absolute; z-index: -1; inset: -80px -110px -70px -70px; pointer-events: none;
  background: radial-gradient(closest-side, rgba(255,255,255,.97) 0%, rgba(255,255,255,.94) 58%, rgba(255,255,255,0) 100%);
  -webkit-backdrop-filter: blur(7px); backdrop-filter: blur(7px);
  -webkit-mask-image: radial-gradient(closest-side, #000 58%, transparent 100%); mask-image: radial-gradient(closest-side, #000 58%, transparent 100%); }
.sc-step { position: absolute; inset: 0 0 auto 0; opacity: 0; transform: translateY(18px); filter: blur(4px);
  transition: opacity .6s ease, transform .6s cubic-bezier(.2,.7,.2,1), filter .6s ease; pointer-events: none; }
.sc-step.on { opacity: 1; transform: none; filter: none; pointer-events: auto; animation: sc-float 7s ease-in-out infinite; }
@keyframes sc-float { 50% { transform: translateY(-5px); } }
.sc-step h4 { font-family: var(--serif); font-weight: 400; font-variant: small-caps; font-size: 38px; line-height: 1.04; color: #000; margin: 0 0 14px;
  text-shadow: 0 0 18px #fff, 0 0 6px #fff; }
.sc-step p { font-size: 18.5px; line-height: 27px; margin: 0; text-align: left; color: #141414; text-shadow: 0 0 14px #fff, 0 0 4px #fff, 0 0 2px #fff; }
/* step flow: a vertical timeline beside the caption */
.sc-flow { position: absolute; z-index: 3; left: 5vw; top: 50%; transform: translateY(-50%); display: flex; flex-direction: column; gap: 15px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; padding-left: 20px; }
.sc-flow::before { content: ""; position: absolute; left: 4px; top: 6px; bottom: 6px; width: 1px; background: #e0e0e0; }
.sc-flow span { position: relative; color: #b5b5b5; white-space: nowrap; line-height: 14px; transition: color .4s; }
.sc-flow span::after { content: ""; position: absolute; left: -20px; top: 3px; width: 7px; height: 7px; border-radius: 50%; background: #fff; border: 1px solid #cfcfcf; transition: all .4s; }
.sc-flow span.done { color: #4a4a4a; }
.sc-flow span.done::after { background: #4a4a4a; border-color: #4a4a4a; }
.sc-flow span.on { color: var(--accent); font-weight: 600; }
.sc-flow span.on::after { background: var(--accent); border-color: var(--accent); box-shadow: 0 0 0 4px rgba(33,16,174,.12); transform: scale(1.15); }
@media (max-width: 760px) {
  .sc-stage::after { inset: 0 0 auto 0; width: auto; height: 44%; background: linear-gradient(180deg, rgba(255,255,255,.97) 0%, rgba(255,255,255,.9) 60%, rgba(255,255,255,0) 100%); }
  .sc-cards { left: 18px; right: 18px; top: 66px; transform: none; width: auto; height: 34vh; }
  .sc-step h4 { font-size: 27px; }
  .sc-step p { font-size: 15.5px; line-height: 22px; }
  .sc-cards::before { inset: -30px -24px -40px -24px; }
  .sc-flow { left: 18px; right: 18px; top: 18px; transform: none; flex-direction: row; flex-wrap: wrap; gap: 4px 0; padding-left: 0; font-size: 9.5px; }
  .sc-flow::before { display: none; }
  .sc-flow span::after { display: none; }
  .sc-flow span + span::before { content: "\2192"; margin: 0 5px; color: #cfcfcf; }
}
@media (prefers-reduced-motion: reduce) { .sc-step, .sc-step.on { transition: none; animation: none; filter: none; } }