:root {
  --navy: #0b1426;
  --navy-2: #111d35;
  --navy-3: #1a2a4a;
  --ink: #16202f;
  --ink-soft: #4a5568;
  --paper: #f7f3ea;
  --paper-2: #efe8d9;
  --gold: #e3a92f;
  --gold-soft: #f3cf7a;
  --red: #d8453a;
  --teal: #3fb6a8;
  --fixed: #5b8def;
  --line: rgba(22, 32, 47, 0.12);
  --radius: 16px;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { overflow-x: clip; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.15; margin: 0 0 0.5em; }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); letter-spacing: -0.01em; }
h3 { font-size: 1.3rem; }
p { margin: 0 0 1em; }
b, strong { font-weight: 650; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.muted { color: var(--ink-soft); }
.fine { font-size: 0.82rem; color: var(--ink-soft); margin: 0.6em 0 0; }

/* ---------- nav ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px;
  background: rgba(11, 20, 38, 0.72);
  backdrop-filter: blur(10px);
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.brand { font-weight: 700; text-decoration: none; display: flex; align-items: center; gap: 10px; letter-spacing: 0.01em; }
.chip-dot { width: 14px; height: 14px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 3px rgba(227, 169, 47, 0.3), inset 0 0 0 3px var(--red); }
.nav nav { display: flex; gap: 22px; font-size: 0.92rem; }
.nav nav a { text-decoration: none; opacity: 0.82; }
.nav nav a:hover { opacity: 1; }
.nav-cta { color: var(--gold) !important; opacity: 1 !important; font-weight: 600; }

/* ---------- hero ---------- */
.hero {
  position: relative; min-height: 100vh; overflow: hidden;
  display: flex; align-items: center;
  background: var(--navy); color: #fff;
}
.hero-img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 70% 50%;
  animation: drift 24s ease-in-out infinite alternate;
}
@keyframes drift { from { transform: scale(1.04) translateX(0); } to { transform: scale(1.1) translateX(-1.5%); } }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(11,20,38,0.96) 0%, rgba(11,20,38,0.85) 38%, rgba(11,20,38,0.2) 70%, rgba(11,20,38,0.1) 100%); }
.hero-copy { position: relative; max-width: 640px; padding: 120px 24px 80px 7vw; }
.eyebrow { color: var(--gold); font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase; font-size: 0.8rem; margin-bottom: 1.2em; }
.hero h1 { font-size: clamp(2.3rem, 5.4vw, 4.1rem); font-weight: 700; margin-bottom: 0.45em; }
.hero h1 em { font-style: italic; color: var(--gold-soft); }
.lede { font-size: 1.1rem; color: rgba(255, 255, 255, 0.86); }
.lede strong { color: #fff; }
.authors { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 1.4em 0 0.2em; font-weight: 600; }
.affil { color: rgba(255, 255, 255, 0.6); font-size: 0.92rem; }
.buttons { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 1.4em; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px; border-radius: 999px; border: 1px solid rgba(255,255,255,0.28);
  background: transparent; color: inherit; font: 600 0.95rem var(--sans);
  text-decoration: none; cursor: pointer; transition: transform 0.15s, background 0.2s, border-color 0.2s;
}
.btn:hover { transform: translateY(-1px); border-color: var(--gold); }
.btn.primary { background: var(--gold); color: var(--navy); border-color: var(--gold); }
.btn.ghost { border-color: var(--line); }
.btn.small { padding: 6px 14px; font-size: 0.85rem; }
.btn:disabled { opacity: 0.4; cursor: default; transform: none; }
.scroll-hint { position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%); color: rgba(255,255,255,0.6); text-decoration: none; font-size: 1.5rem; animation: bob 2s ease-in-out infinite; }
@keyframes bob { 50% { transform: translate(-50%, 8px); } }

/* ---------- stats band ---------- */
.band { background: var(--navy-2); color: #fff; padding: 72px 0; }
.section-kicker { font-family: var(--sans); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.16em; color: var(--gold); margin-bottom: 28px; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat { padding: 24px; border-radius: var(--radius); background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); }
.stat-num { font-family: var(--serif); font-size: 2.8rem; font-weight: 700; color: var(--gold-soft); line-height: 1.1; margin-bottom: 10px; }
.stat p { color: rgba(255,255,255,0.78); font-size: 0.95rem; margin: 0; }
.stat b { color: #fff; }

/* ---------- sections ---------- */
section { scroll-margin-top: 56px; }
.section { padding: 110px 0; }
.section.alt { background: var(--paper-2); }
.section.dark { background: var(--navy); color: #fff; }
.section.dark .muted, .section.dark .fine { color: rgba(255,255,255,0.6); }
.step-label { font: 600 0.8rem var(--mono); color: var(--red); letter-spacing: 0.08em; text-transform: uppercase; }
.section.dark .step-label { color: var(--gold); }
.two-col { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.two-col.reverse { grid-template-columns: 0.9fr 1.1fr; }
.head-row { margin-bottom: 40px; }
.side-art { border-radius: 24px; box-shadow: 0 30px 60px -25px rgba(11,20,38,0.5); }
.side-art.round { border-radius: 50%; }
.ticks { padding-left: 1.1em; }
.ticks li { margin-bottom: 0.3em; }
.subhead { max-width: 760px; margin: 70px 0 20px; }
.note { max-width: 860px; margin: 24px 0; padding: 16px 20px; border-left: 4px solid var(--gold); background: rgba(227,169,47,0.08); border-radius: 0 12px 12px 0; }
.note.on-dark { color: rgba(255,255,255,0.86); }

/* ---------- chart cards ---------- */
.chart-card { margin: 0; padding: 26px 26px 20px; background: #fff; border-radius: var(--radius); box-shadow: 0 1px 0 var(--line), 0 20px 50px -30px rgba(11,20,38,0.35); position: relative; }
.section.dark .chart-card { background: var(--navy-2); box-shadow: 0 0 0 1px rgba(255,255,255,0.08); }
.chart-card figcaption { font-size: 0.95rem; margin-bottom: 8px; }
.chart-card svg { width: 100%; height: auto; overflow: visible; }
.legend { font-size: 0.85rem; color: var(--ink-soft); display: flex; align-items: center; gap: 8px; margin-bottom: 6px; flex-wrap: wrap; }
.lg { width: 12px; height: 12px; border-radius: 50%; display: inline-block; margin-left: 10px; }
.lg:first-child { margin-left: 0; }
.lg.fixed { background: var(--fixed); }
.lg.var { background: var(--red); }
svg text { font-family: var(--sans); fill: var(--ink); }
.section.dark svg text { fill: #e8edf6; }
svg .axis { stroke: var(--line); }
.section.dark svg .axis { stroke: rgba(255,255,255,0.12); }

/* dumbbell + bars grow */
.grow-x { transform-box: fill-box; transform-origin: left center; transform: scaleX(0); transition: transform 1.1s cubic-bezier(.2,.8,.2,1); }
.grow-y { transform-box: fill-box; transform-origin: center bottom; transform: scaleY(0); transition: transform 1s cubic-bezier(.2,.8,.2,1); }
.fade { opacity: 0; transition: opacity 0.6s ease; }
.in .grow-x { transform: scaleX(1); }
.in .grow-y { transform: scaleY(1); }
.in .fade { opacity: 1; }

/* ladder */
.ladder-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; align-items: end; min-height: 300px; margin-top: 10px; }
.lstep { display: flex; flex-direction: column; align-items: stretch; gap: 10px; opacity: 0.25; transition: opacity 0.5s; }
.lstep.lit { opacity: 1; }
.lbar-wrap { height: 210px; display: flex; align-items: flex-end; background: repeating-linear-gradient(0deg, transparent 0 41px, var(--line) 41px 42px); border-radius: 10px; }
.lbar { width: 100%; height: 0; border-radius: 10px 10px 4px 4px; background: linear-gradient(180deg, var(--red), #a92e25); transition: height 0.9s cubic-bezier(.2,.8,.2,1); position: relative; }
.lbar.low { background: linear-gradient(180deg, var(--fixed), #3d69c4); }
.lbar span { position: absolute; top: -30px; left: 0; right: 0; text-align: center; font: 700 1.1rem var(--serif); color: var(--ink); }
.lstep h4 { margin: 0; font-size: 0.92rem; line-height: 1.3; }
.lstep p { margin: 0; font-size: 0.8rem; color: var(--ink-soft); }
#ladderReplay { position: absolute; top: 20px; right: 20px; }

/* goal meters */
.goal-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-bottom: 24px; }
.meter { margin: 14px 0; }
.meter-top { display: flex; justify-content: space-between; font-size: 0.86rem; margin-bottom: 4px; }
.meter-top b { font-family: var(--serif); font-size: 1.1rem; }
.meter-track { height: 14px; background: var(--paper-2); border-radius: 99px; overflow: hidden; }
.meter-fill { height: 100%; width: 0; border-radius: 99px; transition: width 1.2s cubic-bezier(.2,.8,.2,1); }
.meter-fill.base { background: var(--fixed); }
.meter-fill.hot { background: linear-gradient(90deg, var(--gold), var(--red)); }

/* inside list */
.inside-list { padding-left: 1.2em; color: rgba(255,255,255,0.86); }
.inside-list li { margin-bottom: 0.7em; }
.inside-list b { color: var(--gold-soft); }

/* steering */
.steer-controls { display: flex; flex-wrap: wrap; gap: 12px; margin: 10px 0 18px; }
.seg { display: inline-flex; border: 1px solid rgba(255,255,255,0.18); border-radius: 999px; padding: 3px; }
.seg button { border: 0; background: transparent; color: rgba(255,255,255,0.72); font: 600 0.85rem var(--sans); padding: 7px 14px; border-radius: 999px; cursor: pointer; }
.seg button.on { background: var(--gold); color: var(--navy); }
.steer-body { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 28px; align-items: center; }
.dial-wrap { text-align: center; }
#dose { width: 100%; accent-color: var(--gold); }
.dose-labels { display: flex; justify-content: space-between; font: 0.78rem var(--mono); color: rgba(255,255,255,0.55); margin-top: 2px; }
.readout-big { margin: 18px 0 8px; display: flex; flex-direction: column; }
.readout-big strong { font: 700 3.4rem var(--serif); color: var(--gold-soft); line-height: 1.05; transition: color 0.3s; }
.readout-big small { color: rgba(255,255,255,0.6); }
.chips { position: relative; height: 150px; display: flex; justify-content: center; align-items: flex-end; }
.chip { width: 74px; height: 12px; border-radius: 50%; background: var(--red); border: 2px solid #fff3; margin-top: -5px; box-shadow: 0 2px 0 #7a1f18; position: absolute; left: calc(50% - 37px); transition: bottom 0.4s cubic-bezier(.2,.8,.2,1), opacity 0.3s; }
.chip:nth-child(even) { background: var(--gold); box-shadow: 0 2px 0 #8a6414; }

/* slot game */
.slot { position: relative; border-radius: 24px; overflow: hidden; background: var(--navy); color: #fff; box-shadow: 0 30px 60px -25px rgba(11,20,38,0.6); }
.slot-art { width: 100%; height: 220px; object-fit: cover; object-position: 50% 40%; opacity: 0.55; }
.slot-panel { padding: 20px 22px 22px; margin-top: -90px; position: relative; }
.reels { display: flex; gap: 10px; justify-content: center; margin-bottom: 16px; }
.reel { width: 76px; height: 86px; border-radius: 12px; background: var(--paper); color: var(--navy); display: grid; place-items: center; font-size: 2.2rem; box-shadow: inset 0 -8px 16px rgba(0,0,0,0.12), 0 0 0 3px var(--gold); overflow: hidden; }
.reel.spin span { animation: reel 0.12s linear infinite; }
@keyframes reel { from { transform: translateY(-60%); } to { transform: translateY(60%); } }
.reel.win { box-shadow: inset 0 -8px 16px rgba(0,0,0,0.12), 0 0 0 3px var(--teal), 0 0 22px var(--teal); }
.slot-row { display: grid; grid-template-columns: repeat(3, 1fr); text-align: center; margin-bottom: 14px; }
.slot-row small { display: block; color: rgba(255,255,255,0.55); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em; }
.slot-row strong { font: 700 1.4rem var(--serif); }
.mode { display: flex; gap: 8px; justify-content: center; margin-bottom: 10px; }
.mode button { border: 1px solid rgba(255,255,255,0.22); background: transparent; color: #fff; padding: 6px 14px; border-radius: 999px; font: 600 0.85rem var(--sans); cursor: pointer; }
.mode button.on { background: #fff; color: var(--navy); }
.bet-row { display: flex; gap: 10px; align-items: center; justify-content: center; font-size: 0.9rem; margin-bottom: 10px; }
.bet-row[hidden] { display: none; }
.bet-row input { accent-color: var(--gold); width: 170px; }
.slot-actions { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.slot-actions .btn.ghost { border-color: rgba(255,255,255,0.2); }
.spark { width: 100%; height: 60px; margin-top: 14px; }
.spark polyline { fill: none; stroke: var(--gold); stroke-width: 2; vector-effect: non-scaling-stroke; }
.slot-msg { text-align: center; font-size: 0.85rem; color: rgba(255,255,255,0.7); margin: 6px 0 0; min-height: 2.6em; }

/* claims */
.claims { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 24px; }
.claim { padding: 26px; border-radius: var(--radius); background: #fff; border-top: 5px solid var(--teal); }
.claim.no { border-top-color: var(--ink-soft); }
.claim ul { padding-left: 1.1em; margin: 0; }
.claim li { margin-bottom: 0.6em; }

/* paper figure toggles */
.paper-fig { margin-top: 26px; }
.paper-fig summary { cursor: pointer; font-weight: 600; color: var(--red); }
.section.dark .paper-fig summary { color: var(--gold); }
.paper-fig img { margin-top: 14px; border-radius: 12px; background: #fff; padding: 12px; }

/* resources */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 24px 0 40px; }
.card { display: flex; flex-direction: column; gap: 6px; padding: 24px; border-radius: var(--radius); background: #fff; text-decoration: none; border: 1px solid var(--line); transition: transform 0.2s, box-shadow 0.2s; }
.card:hover { transform: translateY(-3px); box-shadow: 0 20px 40px -24px rgba(11,20,38,0.4); }
.card-k { font: 600 0.75rem var(--mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--red); }
.card strong { font-size: 1rem; word-break: break-word; }
.card span:last-child { color: var(--ink-soft); font-size: 0.9rem; }
.cite { background: var(--navy); color: #e8edf6; border-radius: var(--radius); padding: 22px 24px; }
.cite-head { display: flex; justify-content: space-between; align-items: center; }
.cite h3 { margin: 0; color: #fff; }
.cite .btn.ghost { border-color: rgba(255,255,255,0.25); }
.cite pre { font: 0.82rem/1.6 var(--mono); white-space: pre-wrap; margin: 14px 0 0; }
.foot { background: var(--navy); color: rgba(255,255,255,0.6); text-align: center; padding: 30px 24px; font-size: 0.85rem; }

/* reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.8s ease, transform 0.8s cubic-bezier(.2,.8,.2,1); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .nav nav a:not(.nav-cta) { display: none; }
  .stats { grid-template-columns: 1fr 1fr; }
  .two-col, .two-col.reverse { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .two-col.reverse .side-art { order: 2; }
  .goal-grid, .claims, .cards { grid-template-columns: 1fr; }
  .steer-body { grid-template-columns: minmax(0, 1fr); }
  .nav nav { gap: 0; }
  .hero-copy { padding: 110px 20px 70px; }
  .hero-shade { background: linear-gradient(180deg, rgba(11,20,38,0.7) 0%, rgba(11,20,38,0.92) 55%); }
  .section { padding: 80px 0; }
  .side-art { max-width: 420px; margin: 0 auto; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .nav { padding: 12px 16px; }
  .stats { grid-template-columns: 1fr; }
  .ladder-steps { grid-template-columns: repeat(2, 1fr); row-gap: 40px; }
  .lbar-wrap { height: 150px; }
  .reel { width: 64px; height: 74px; font-size: 1.8rem; }
  .chart-card { padding: 20px 14px 16px; }
  #ladderReplay { position: static; margin-top: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}