/*
 * Visual system from DESIGN.md: a warm cream canvas, a serif display at regular
 * weight, Inter for running text, a single coral accent, and warm dark bands for
 * the product surfaces. Loaded last; everything else reads these tokens.
 */
:root, :root[data-theme="dark"], :root:not([data-theme="light"]) {
  color-scheme: light;
  --bg: #faf9f5;
  --surface: #efe9de;
  --surface-2: #e8e0d2;
  --ink: #141413;
  --ink-2: #3d3d3a;
  --muted: #6c6a64;
  --line: #e6dfd8;
  --axis: #cfc6b8;
  --accent: #c2613f;
  --accent-ink: #a9583e;
  --accent-wash: #f3e4da;
  --c-constrained: #c2613f;
  --c-penalty: #c0811f;
  --c-field: #2a8c7a;
  --c-relevance: #7a5f8c;
  --c-greedy: #4f7f98;
  --c-annealing: #6c6a64;
  --c-random: #a7a297;
  --c-exact: #141413;
  --good: #2a8c7a;
  --hero-1: #181715;
  --hero-2: #252320;
  --shadow: none;
  --radius: 12px;
  --serif: "Cormorant Garamond", Garamond, "Times New Roman", serif;
  --font: Inter, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", Consolas, monospace;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) { color-scheme: light; } }

/* Warm dark bands: the same tokens, inverted, so every chart inside follows. */
section.tint, .band-dark {
  --bg: #181715;
  --surface: #252320;
  --surface-2: #1f1e1b;
  --ink: #faf9f5;
  --ink-2: #a09d96;
  --muted: #8e8b82;
  --line: #3a3733;
  --axis: #4a4640;
  --accent: #e08a6c;
  --accent-ink: #e8a58c;
  --accent-wash: #2f2520;
  --c-constrained: #e08a6c;
  --c-penalty: #e8a55a;
  --c-field: #5db8a6;
  --c-relevance: #b093c4;
  --c-greedy: #86b3cc;
  --c-annealing: #a09d96;
  --c-random: #7d7970;
  --c-exact: #faf9f5;
  --good: #5db8a6;
  background: var(--bg) !important;
  color: var(--ink);
  border: 0 !important;
}

body { background: var(--bg); color: var(--ink-2); font-family: var(--font); font-size: 16.5px; line-height: 1.58; letter-spacing: 0; }
h1, h2, h3, .hero h1, .formula { font-family: var(--serif); }
h1, h2, h3 { font-weight: 500; color: var(--ink); letter-spacing: -0.02em; text-wrap: balance; }
h2 { font-size: clamp(34px, 4.4vw, 58px); line-height: 1.05; max-width: 22em; }
h3 { font-size: clamp(22px, 2vw, 28px); line-height: 1.15; }
.lead { color: var(--ink-2); font-size: 18px; }
.small { color: var(--ink-2); }
a { color: var(--accent-ink); }
::selection { background: #f0d3c4; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* section labels: quiet, not a numbered badge */
.eyebrow { font: 500 12px/1.4 var(--font); letter-spacing: 1.5px; text-transform: uppercase; color: var(--muted); gap: 10px; }
.eyebrow b { width: auto; height: auto; background: none; border-radius: 0; color: var(--accent); font-size: 12px; }
section { padding: 96px 0; }

/* cards: colour blocks, no shadow */
.card { background: var(--surface); border: 0; border-radius: 12px; box-shadow: none; }
.tint .card { background: var(--surface); }
.card .ico { background: var(--bg); color: var(--accent); }
.stat .v { font-family: var(--serif); font-weight: 500; letter-spacing: -0.02em; font-size: clamp(44px, 4.4vw, 64px); }
.stat .v small { font-family: var(--font); font-weight: 500; }
.big-compare .n, .plan-panel .big { font-family: var(--serif); font-weight: 500; letter-spacing: -0.02em; font-size: 56px; }
.callout { background: var(--accent); border: 0; color: #fff; border-radius: 12px; font-family: var(--serif); font-weight: 500; font-size: 26px; line-height: 1.25; padding: 40px 44px; }
.callout span { color: #fbe9df; font-family: var(--font); }
.formula { background: var(--surface); font-size: clamp(20px, 2.4vw, 32px); }
.formula .t1 { color: var(--accent-ink); }
.formula .t2 { color: var(--c-field); }
th { color: var(--muted); border-bottom-color: var(--ink); }
.tag { background: var(--bg); }
.limit { border-left: 3px solid var(--accent); }
pre { background: #181715; color: #e8e2d6; border-radius: 12px; }
pre .c { color: #8e8b82; }
.avatar { background: var(--bg); color: var(--accent); font-family: var(--serif); font-size: 20px; }
footer { background: #181715; color: #a09d96; border: 0; }
footer a { color: #e8a58c; }

/* buttons */
.btn { border-radius: 8px; font: 500 14px/1 var(--font); padding: 13px 20px; }
.btn:hover { transform: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-ink); }
.btn-ghost { background: var(--bg); color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--axis); }
.tab { background: transparent; border-color: var(--line); color: var(--muted); border-radius: 8px; }
.tab[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }

/* navigation: cream, translucent, the same on every band */
.nav, .nav.on-hero, .nav.on-hero.moved { background: rgba(250, 249, 245, 0.88); backdrop-filter: saturate(1.2) blur(10px); }
.nav.scrolled { border-bottom-color: var(--line); }
.nav .brand, .nav.on-hero .brand { color: var(--ink); font-family: var(--serif); font-weight: 600; font-size: 22px; letter-spacing: -0.01em; }
.nav-links a, .nav.on-hero .nav-links a { color: var(--ink-2); font-size: 13.5px; }
.nav-links a.active, .nav.on-hero .nav-links a.active { background: var(--surface); color: var(--ink); }
.nav-links a:hover { background: var(--surface); }
#theme { display: none; }
#progress { background: linear-gradient(90deg, #c2613f, #c0811f 50%, #2a8c7a); height: 3px; }

/* charts on cream */
.chart .meanbar { stroke: var(--ink); }
.bar-row .track { background: var(--surface-2); }
#tip { background: #181715; color: #faf9f5; border-radius: 8px; }

/* the lab: the product surface, in warm dark */
.lab {
  --lab-bg: #181715; --lab-panel: #1f1e1b; --lab-panel-2: #252320;
  --lab-line: #3a3733; --lab-ink: #faf9f5; --lab-ink-2: #a09d96; --lab-muted: #8e8b82;
  --lab-accent: #e08a6c; --lab-blue: #c2613f; --lab-best: #e8a55a;
  background: var(--lab-bg) !important;
}
.lab .eyebrow b { background: none; }
.lab-panel { background: var(--lab-panel); border-color: var(--lab-line); border-radius: 12px; }
.lab-btn.primary { background: #c2613f; border-color: #c2613f; }
.lab-btn.primary:hover { background: #a9583e; border-color: #a9583e; }
.seg button[aria-checked="true"] { background: #c2613f; }
.read-big span, .kits output, .pc-pct { font-family: var(--serif); font-weight: 500; letter-spacing: -0.02em; }
.read-big span { font-size: 60px; }
.bit.on { background: #c2613f; border-color: #e08a6c; }
.t-node.tested .shape { fill: #c2613f; stroke: #e08a6c; }
.lg.tested { background: #c2613f; border-color: #e08a6c; }
.pcard.qaoa { border-color: rgba(224, 138, 108, 0.55); background: rgba(194, 97, 63, 0.14); }
.cmp-bar.ok i, .tally-row .tb i { background: #c2613f; }
.cmp-bar i { background: #e8a55a; }
.read-meter i { background: linear-gradient(90deg, #c2613f, #e8a55a); }
.t-kin { stroke: rgba(250, 249, 245, 0.22); }
.t-mar { stroke: rgba(250, 249, 245, 0.35); }
.t-node .shape { fill: #1f1e1b; stroke: rgba(250, 249, 245, 0.5); }
.t-node.candidate .shape { stroke: #d8d1c4; }
.t-node.obligate .shape { fill: #3a3733; }
.t-node.affected .shape { fill: #faf9f5; stroke: #faf9f5; }
.t-node .pv { fill: #e8e2d6; }
.t-node .pl { fill: #a09d96; }

/* the scroll-scene engine (web/scenes.js) */
.scene { position: relative; padding: 0; }
.scene .stage { position: sticky; top: 0; height: 100vh; height: 100svh; overflow: hidden; }
.scene .stage > canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.scene.dark { background: #181715; --ink: #faf9f5; --ink-2: #a09d96; --muted: #8e8b82; }
.scene .cap { position: absolute; z-index: 2; left: max(24px, calc((100vw - 1140px) / 2)); top: 50%; transform: translateY(-50%); width: min(36vw, 460px); }
.scene .beats { display: grid; }
.scene .beat { grid-area: 1 / 1; opacity: 0; transform: translateY(14px); transition: opacity 0.45s ease, transform 0.55s cubic-bezier(0.2, 0.7, 0.2, 1); pointer-events: none; min-width: 0; }
.scene .beat.on { opacity: 1; transform: none; pointer-events: auto; }
.scene .beat p { margin: 14px 0 0; color: var(--ink-2); font-size: 17px; }
.scene .beat p b { color: var(--ink); font-weight: 500; }
.scene .src { position: absolute; z-index: 2; left: 24px; right: 24px; bottom: 12px; margin: 0; text-align: right; font-size: 12.5px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#hero.scene .ttl { position: absolute; z-index: 2; left: 0; right: 0; top: clamp(78px, 12vh, 120px); text-align: center; padding-inline: 20px; pointer-events: none; }
#hero.scene .ttl h1 { font-size: clamp(64px, 11.5vw, 176px); line-height: 0.95; font-weight: 500; letter-spacing: -0.03em; color: var(--ink); margin: 0; }
#hero.scene .ttl .sub { margin: 12px auto 0; max-width: 40em; font-size: clamp(15px, 1.5vw, 20px); color: var(--ink-2); }
#hero.scene .lower { position: absolute; z-index: 2; left: 50%; bottom: clamp(22px, 6vh, 60px); transform: translateX(-50%); width: min(700px, calc(100% - 48px)); text-align: center; }
#hero.scene .lower .beat p { font-size: 17px; }
#hero.scene .lower .cta { justify-content: center; margin-top: 18px; }
@media (max-width: 860px) {
  .scene .cap { top: calc(64px + env(safe-area-inset-top, 0px)); transform: none; width: calc(100% - 48px); left: 24px; }
  .scene .cap h2 { font-size: 30px; }
  .scene .beat p { font-size: 15px; }
  .scene .src { left: 16px; right: 16px; }
}
@media (prefers-reduced-motion: reduce) { .scene .beat { transition: none; } }

/* pages */
.paged .eyebrow b { display: none; }
.paged .nav-links { gap: 2px; }
.paged .nav-links a { font-size: 14px; padding: 8px 14px; border-radius: 8px; }
.paged .nav-links a.active { background: var(--ink); color: var(--bg); }
.paged main > section[hidden], .paged .next-page[hidden] { display: none !important; }
.next-page { background: var(--bg); padding: 56px 0 80px; }
.next-page .wrap { display: flex; align-items: baseline; gap: 18px; border-top: 1px solid var(--line); padding-top: 28px; }
.next-page span { font: 500 12px/1 var(--font); letter-spacing: 1.5px; text-transform: uppercase; color: var(--muted); }
.next-page a { font-family: var(--serif); font-weight: 500; font-size: clamp(30px, 3.6vw, 46px); letter-spacing: -0.02em; color: var(--ink); text-decoration: none; }
.next-page a:hover { color: var(--accent); }
.next-page a::after { content: ""; display: inline-block; width: 0.5em; height: 0.5em; margin-left: 0.4em; border-top: 2px solid currentColor; border-right: 2px solid currentColor; transform: rotate(45deg) translateY(-0.1em); }
.paged #lab { min-height: 100vh; padding-top: 104px; }

/* folded detail */
details.more { margin-top: 24px; border-top: 1px solid var(--line); }
details.more > summary {
  cursor: pointer; list-style: none; padding: 16px 0 4px; font: 500 14px/1.4 var(--font); color: var(--accent-ink);
  display: inline-flex; align-items: center; gap: 8px;
}
details.more > summary::-webkit-details-marker { display: none; }
details.more > summary::before { content: "+"; display: inline-grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; background: var(--surface); color: var(--ink); font-size: 14px; }
details.more[open] > summary::before { content: "\2212"; }
details.more > :not(summary) { margin-top: 18px; }
details.limit-fold { padding: 0; }
details.limit-fold > summary { cursor: pointer; list-style: none; padding: 20px 24px; font-family: var(--serif); font-weight: 500; font-size: 22px; color: var(--ink); display: flex; justify-content: space-between; gap: 12px; }
details.limit-fold > summary::-webkit-details-marker { display: none; }
details.limit-fold > summary::after { content: "+"; font-family: var(--font); color: var(--accent); }
details.limit-fold[open] > summary::after { content: "\2212"; }
details.limit-fold > p { padding: 0 24px 20px; margin: 0; }

/* Cormorant draws old-style figures by default; numbers here must read as numbers. */
h1, h2, h3, .stat .v, .big-compare .n, .plan-panel .big, .read-big span, .kits output, .pc-pct, .callout, .next-page a, .formula, details.limit-fold > summary {
  font-variant-numeric: lining-nums tabular-nums; font-feature-settings: "lnum" 1, "tnum" 1;
}
#hero.scene .lower .note { margin-top: 14px; font-size: 12.5px; color: var(--muted); }
/* lab.css also styles .stage (the circuit step chips); a scene stage is a plain full-screen frame. */
.scene > .stage { border-radius: 0; background: none; border: 0; padding: 0; cursor: auto; font: inherit; color: inherit; overflow: hidden; }

/* Plan page: one flow */
.lab-plan .plan-cards { gap: 10px; }
.pcard.qaoa .pc-head b { font-family: var(--serif); font-weight: 500; font-size: 24px; letter-spacing: -0.01em; }
.pcard.qaoa .pc-pct { font-size: 34px; color: #fff; }
.pcard.qaoa .pc-names { font-size: 16px; font-weight: 500; margin-top: 6px; }
.pc-table { width: 100%; border-collapse: collapse; font-size: 13.5px; margin-top: 4px; }
.pc-table th { font: 500 11.5px/1.3 var(--font); letter-spacing: 0; text-transform: none; color: var(--lab-muted); border-bottom: 1px solid var(--lab-line); padding: 6px 8px 6px 0; text-align: left; }
.pc-table td { color: var(--lab-ink-2); border-bottom: 1px solid var(--lab-line); padding: 8px 8px 8px 0; }
.pc-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.pc-table tr.q td { color: var(--lab-ink); font-weight: 600; }
.pc-table tr:last-child td { border-bottom: 0; }
.lab-row-title { color: var(--lab-ink); font-size: 24px; margin: 22px 0 -4px; }
.land-btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
details.lab-more { border-top-color: var(--lab-line); margin-top: 8px; }
details.lab-more > summary { color: #e8a58c; font-size: 15px; }
details.lab-more > summary::before { background: var(--lab-panel-2); color: var(--lab-ink); }
details.lab-more[open] > summary { margin-bottom: 4px; }
details.lab-more > .lab-lower, details.lab-more > .lab-vs { margin-top: 18px; }

/* Results dashboard */
.dash-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin: 44px 0 22px; padding: 4px; background: var(--surface); border-radius: 10px; width: fit-content; max-width: 100%; }
.dash-tab { font: 500 14px/1 var(--font); color: var(--ink-2); background: none; border: 0; padding: 10px 14px; border-radius: 8px; cursor: pointer; }
.dash-tab[aria-selected="true"] { background: var(--ink); color: var(--bg); }
.dash-tab:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.dash-panel[hidden] { display: none; }
.dash-panel .dash-hide { display: none; }
.dash-panel > .grid:first-child, .dash-panel > .chart-legend:first-child { margin-top: 0 !important; }
.chart-card .sub { font-size: 13px; color: var(--muted); }
details.more.note { margin-top: 10px; border-top: 0; }
details.more.note > summary { padding-top: 4px; font-size: 13px; }
details.more.note > summary::before { width: 16px; height: 16px; font-size: 12px; }
.stat .l { font-size: 14px; }

/* live shot feed */
.feed { background: var(--surface); }
.feed-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 48px; align-items: center; }
.feed-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 28px; }
.feed-stats b { display: block; font-family: var(--serif); font-weight: 500; font-size: 44px; line-height: 1; color: var(--ink); font-variant-numeric: lining-nums tabular-nums; }
.feed-stats small { display: block; margin-top: 6px; font-size: 13px; color: var(--muted); }
.feed-stats div:nth-child(2) b { color: var(--accent); }
.feed-meter { height: 6px; border-radius: 99px; background: var(--surface-2); margin-top: 18px; overflow: hidden; }
.feed-meter i { display: block; height: 100%; width: 0; background: var(--accent); border-radius: 99px; transition: width 0.4s; }
.feed-rows { display: grid; gap: 8px; }
.feed-row { display: grid; grid-template-columns: 52px auto minmax(0, 1fr) 76px; gap: 14px; align-items: center; background: var(--bg); border-radius: 10px; padding: 10px 14px; }
.feed-row.enter { animation: feedIn 0.45s cubic-bezier(0.2, 0.7, 0.2, 1); }
@keyframes feedIn { from { opacity: 0; transform: translateY(-12px); } to { opacity: 1; transform: none; } }
.feed-row.best { outline: 1.5px solid var(--accent); }
.feed-no { font: 500 12px/1 var(--mono); color: var(--muted); }
.feed-bits { display: inline-grid; grid-template-columns: repeat(10, 14px); gap: 3px; }
.feed-bits i { width: 14px; height: 18px; border-radius: 3px; background: var(--surface-2); }
.feed-bits i.on { background: var(--accent); }
.feed-names { font-size: 13px; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.feed-val { text-align: right; font: 600 13px/1 var(--font); color: var(--ink); font-variant-numeric: tabular-nums; }
.feed-row.best .feed-val { color: var(--accent); }
@media (max-width: 900px) {
  .feed-grid { grid-template-columns: 1fr; gap: 28px; }
  .feed-row { grid-template-columns: 40px auto 56px; }
  .feed-names { display: none; }
}
@media (prefers-reduced-motion: reduce) { .feed-row.enter { animation: none; } }

/* Limits and team */
#limits .grid { align-items: stretch; }
#limits .card.clamp { display: flex; flex-direction: column; padding: 24px 26px; }
#limits .card.clamp h3 { font-size: 23px; margin-bottom: 10px; }
#limits .card.clamp p { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; margin: 0; }
#limits .card.clamp.open p { display: block; -webkit-line-clamp: unset; overflow: visible; }
#limits .more-btn { margin-top: auto; padding-top: 12px; align-self: flex-start; background: none; border: 0; cursor: pointer; font: 500 13px/1 var(--font); color: var(--accent); }
#limits .more-btn:hover { text-decoration: underline; }
#limits .grid > .card.limit:first-child { grid-column: 1 / -1; border-left-width: 4px; }
#limits .grid > .card.limit:first-child h3 { font-size: clamp(28px, 3vw, 40px); }
#limits .grid > .card.limit:first-child p { -webkit-line-clamp: 2; font-size: 16.5px; max-width: 70em; }
#ethics .card.clamp, #ethics .card { border-left: 0; }
#team .member { background: var(--surface); padding: 20px 22px; }
#team .avatar { width: 52px; height: 52px; font-size: 22px; background: var(--bg); }
#team pre { margin-top: 6px; }
#team pre { font-size: 12.5px; white-space: pre-wrap; overflow-x: visible; }

/* Plan page: steps, status, reasons, animated changes */
.plan-steps { list-style: none; margin: 0 0 14px; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.plan-steps li { display: flex; align-items: center; gap: 10px; background: var(--lab-panel-2); border-radius: 10px; padding: 10px 12px; font-size: 13.5px; color: var(--lab-ink); line-height: 1.3; }
.plan-steps b { flex: none; display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: #c2613f; color: #fff; font: 600 12px/1 var(--font); }
.plan-status { position: relative; border-radius: 8px; background: var(--lab-panel-2); padding: 9px 12px 11px; font-size: 13px; color: var(--lab-ink-2); overflow: hidden; }
.plan-status i { position: absolute; left: 0; bottom: 0; height: 3px; width: 100%; background: #5db8a6; transition: width 0.3s ease; }
.plan-status.busy { color: var(--lab-ink); }
.plan-status.busy i { background: #e8a55a; }
#plan-cards { transition: opacity 0.2s; }
#plan-cards.dim { opacity: 0.35; }
.pc-why { margin-top: 10px; padding-top: 10px; border-top: 1px solid rgba(224, 138, 108, 0.3); font-size: 13.5px; color: var(--lab-ink); line-height: 1.45; }
.pc-field { margin: 8px 0 0; font-size: 12.5px; color: var(--lab-ink-2); line-height: 1.45; }
.t-node .shape { transform-box: fill-box; transform-origin: center; }
.t-node.pop .shape { animation: nodePop 0.55s cubic-bezier(0.2, 0.9, 0.3, 1.4); }
@keyframes nodePop { 0% { transform: scale(0.6); } 60% { transform: scale(1.18); } 100% { transform: scale(1); } }
.t-pair.both.draw { stroke-dasharray: 700; stroke-dashoffset: 700; animation: arcDraw 0.8s 0.15s ease forwards; }
@keyframes arcDraw { to { stroke-dashoffset: 0; } }
@media (max-width: 760px) { .plan-steps { grid-template-columns: 1fr; } }
@media (prefers-reduced-motion: reduce) { .t-node.pop .shape, .t-pair.both.draw { animation: none; stroke-dashoffset: 0; } }
.pcard.qaoa .pc-head b, .lab-row-title, .lab h2 { font-variant-numeric: lining-nums; font-feature-settings: "lnum" 1; }