:root {
  color-scheme: dark;
  --bg: #0b0b0e;
  --surface: #121217;
  --surface-raised: #19191f;
  --line: #303037;
  --paper: #f3eadb;
  --muted: #b7b0a4;
  --quiet: #89847b;
  --gold: #c5a274;
  --green: #99aa84;
  --red: #c27d70;
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: Iowan Old Style, Baskerville, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --max: 1200px;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; color: var(--paper); background: var(--bg); font: 16px/1.55 var(--sans); -webkit-font-smoothing: antialiased; }
body::before { content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none; background: radial-gradient(ellipse at 72% 0%, rgba(197,162,116,.11), transparent 45%), linear-gradient(135deg, transparent 60%, rgba(197,162,116,.025)); }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .2em; }
button, select { font: inherit; }
button { color: inherit; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }
::selection { background: var(--gold); color: var(--bg); }
.skip-link { position: absolute; top: -4rem; left: 1rem; z-index: 100; padding: .7rem 1rem; color: var(--bg); background: var(--paper); }
.skip-link:focus { top: 1rem; }
.wrap { width: min(var(--max), calc(100% - 48px)); margin-inline: auto; }
.topbar { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid rgba(243,234,219,.1); background: rgba(11,11,14,.9); backdrop-filter: blur(14px); }
.nav { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; letter-spacing: .015em; font-size: .98rem; font-weight: 600; }
.brand-mark { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid var(--gold); color: var(--gold); font-family: var(--serif); font-style: italic; }
.nav-right, .nav-links { display: flex; align-items: center; gap: clamp(14px, 3vw, 32px); }
.nav-links a, .language a { display: inline-flex; min-height: 44px; align-items: center; color: var(--muted); font-size: .84rem; text-decoration: none; }
.nav-links a:hover, .language a:hover, footer a:hover { color: var(--gold); }
.language { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: .75rem; }
.language .current { color: var(--paper); }
.language span { color: var(--quiet); }
.hero { padding: clamp(50px, 8vw, 96px) 0 42px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, .92fr) minmax(420px, 1.08fr); gap: clamp(32px, 6vw, 78px); align-items: center; }
.eyebrow { margin: 0 0 17px; color: var(--gold); font: 600 .72rem/1.4 var(--mono); letter-spacing: .13em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 12ch; margin-bottom: 20px; font-size: clamp(2.8rem, 6.3vw, 5.45rem); line-height: .99; font-weight: 560; letter-spacing: -.055em; }
h1 em, .accent { color: var(--gold); font-family: var(--serif); font-weight: 400; }
.lede { max-width: 54ch; color: var(--muted); font-size: clamp(1rem, 1.5vw, 1.15rem); }
.hero-note { margin: 28px 0 0; padding-left: 16px; border-left: 1px solid var(--gold); color: var(--muted); font-size: .9rem; }
.hero-note strong { color: var(--paper); font-weight: 550; }
.demo { border: 1px solid var(--line); background: linear-gradient(145deg, #17171d, #101014 75%); box-shadow: 0 24px 90px rgba(0,0,0,.28); }
.demo-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; padding: 22px 24px 18px; border-bottom: 1px solid var(--line); }
.demo-head h2 { margin: 0 0 4px; font-size: 1.07rem; font-weight: 570; }
.demo-head p { margin: 0; color: var(--quiet); font-size: .8rem; }
.demo-state { padding: 5px 9px; border: 1px solid rgba(197,162,116,.44); color: var(--gold); font: .68rem var(--mono); white-space: nowrap; }
.demo-instrument { display: flex; justify-content: space-between; align-items: end; gap: 20px; padding: 20px 24px 8px; }
.instrument-name { display: grid; gap: 3px; }
.instrument-name strong { font-size: 1.3rem; font-weight: 600; letter-spacing: -.02em; }
.instrument-name span, .demo-return small { color: var(--quiet); font-size: .78rem; }
.demo-return { text-align: right; }
.demo-return b { display: block; color: var(--green); font: 500 1.2rem var(--mono); }
.chart-wrap { padding: 4px 20px 0; }
.chart { display: block; width: 100%; height: auto; overflow: visible; }
.chart .grid { stroke: rgba(243,234,219,.09); stroke-width: 1; }
.chart .axis { fill: var(--quiet); font: 11px var(--mono); }
.chart .plot { stroke: var(--gold); stroke-width: 2.5; stroke-dasharray: 7 7; stroke-linecap: round; }
.chart .point { fill: var(--bg); stroke: var(--gold); stroke-width: 2; }
.chart .end-point { fill: var(--gold); stroke: var(--bg); stroke-width: 3; }
.chart .guide { stroke: rgba(197,162,116,.42); stroke-dasharray: 4 5; }
.chart-caption { display: flex; justify-content: space-between; gap: 15px; padding: 0 25px 17px; color: var(--quiet); font: .68rem var(--mono); }
.demo-steps { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); }
.demo-step { min-height: 86px; padding: 14px 11px; border: 0; border-right: 1px solid var(--line); background: transparent; text-align: left; cursor: pointer; }
.demo-step:last-child { border-right: 0; }
.demo-step:hover, .demo-step[aria-pressed="true"] { background: rgba(197,162,116,.09); }
.step-number { display: block; margin-bottom: 6px; color: var(--gold); font: .66rem var(--mono); }
.demo-step[aria-pressed="true"] .step-number { color: var(--paper); font-weight: 700; }
.step-label { display: block; color: var(--muted); font-size: .76rem; font-weight: 550; }
.demo-explanation { min-height: 68px; padding: 14px 24px 17px; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; }
.demo-explanation strong { color: var(--paper); font-weight: 550; }
.disclosure { padding: 0 24px 18px; color: var(--quiet); font-size: .72rem; }
.section { padding: clamp(64px, 9vw, 112px) 0; border-top: 1px solid rgba(243,234,219,.1); }
.section-heading { display: grid; grid-template-columns: minmax(0, .8fr) minmax(260px, .55fr); gap: 32px; align-items: end; margin-bottom: 34px; }
.section-heading h2 { max-width: 13ch; margin: 0; font-size: clamp(2.1rem, 4.3vw, 3.55rem); line-height: 1.02; font-weight: 520; letter-spacing: -.045em; }
.section-heading p { margin: 0; color: var(--muted); font-size: .92rem; }
.overview { display: grid; grid-template-columns: 1.2fr .8fr; border: 1px solid var(--line); background: var(--surface); }
.overview-intro { padding: 28px; border-right: 1px solid var(--line); }
.overview-intro h3 { margin-bottom: 9px; font-size: 1.05rem; font-weight: 570; }
.overview-intro p { max-width: 52ch; margin: 0; color: var(--muted); font-size: .88rem; }
.summary-side { display: grid; align-content: center; gap: 12px; padding: 26px; }
.summary-count { color: var(--gold); font: 500 clamp(2rem,4vw,3rem)/1 var(--mono); }
.summary-label { color: var(--muted); font-size: .84rem; }
.summary-state { margin: 0; color: var(--quiet); font-size: .78rem; }
.summary-state[data-state="error"] { color: #d59a8f; }
.summary-state[data-state="stale"] { color: #d7b478; }
.summary-time { color: var(--quiet); font: .68rem var(--mono); }
.summary-meta { display: flex; flex-wrap: wrap; grid-column: 1 / -1; gap: 10px 28px; margin-top: 8px; padding-top: 14px; border-top: 1px solid var(--line); }
.summary-meta span { color: var(--quiet); font-size: .7rem; }
.summary-meta strong { display: block; margin-top: 4px; color: var(--paper); font: 500 .77rem var(--mono); }
.summary-retry { width: fit-content; min-height: 44px; padding: 7px 10px; border: 1px solid var(--line); color: var(--paper); background: var(--surface-raised); cursor: pointer; font-size: .74rem; }
.summary-retry:hover { border-color: var(--gold); }
.summary-breakdown { display: grid; grid-template-columns: 190px 1fr; margin-top: 14px; border: 1px solid var(--line); background: var(--surface); }
.summary-toggle { display: grid; align-content: start; border-right: 1px solid var(--line); }
.summary-toggle button { min-height: 52px; padding: 0 16px; border: 0; border-bottom: 1px solid rgba(243,234,219,.08); color: var(--muted); background: transparent; text-align: left; cursor: pointer; font-size: .82rem; }
.summary-toggle button[aria-selected="true"] { color: var(--paper); background: rgba(197,162,116,.1); box-shadow: inset 2px 0 var(--gold); }
.breakdown-list { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 8px 24px; align-content: center; padding: 18px 22px; }
.breakdown-row { display: grid; grid-template-columns: minmax(82px, auto) minmax(60px,1fr) auto; align-items: center; gap: 10px; color: var(--muted); font-size: .76rem; }
.breakdown-row strong { color: var(--paper); font: 500 .72rem var(--mono); }
.breakdown-bar { height: 3px; background: var(--line); }
.breakdown-bar i { display: block; height: 100%; background: var(--gold); }
.summary-insufficient { margin: 8px 0 0; color: var(--quiet); font-size: .74rem; }
.summary-rounding { margin: 8px 0 0; color: var(--quiet); font-size: .72rem; }
.stage-control { padding: 13px 24px 12px; border-top: 1px solid var(--line); }
.stage-control label { display: block; margin-bottom: 10px; color: var(--quiet); font: .66rem var(--mono); letter-spacing: .04em; text-transform: uppercase; }
.stage-control input { display: block; width: 100%; height: 44px; margin: 0; appearance: none; background: transparent; cursor: pointer; }
.stage-control input::-webkit-slider-runnable-track { height: 3px; background: linear-gradient(to right, var(--gold) var(--progress, 0%), var(--line) var(--progress, 0%)); }
.stage-control input::-moz-range-track { height: 3px; background: linear-gradient(to right, var(--gold) var(--progress, 0%), var(--line) var(--progress, 0%)); }
.stage-control input::-webkit-slider-thumb { width: 16px; height: 16px; margin-top: -6.5px; appearance: none; border: 2px solid var(--bg); border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 1px var(--gold); }
.stage-control input::-moz-range-thumb { width: 13px; height: 13px; border: 2px solid var(--bg); border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 1px var(--gold); }
.range-labels { display: flex; justify-content: space-between; padding: 3px 1px 0; color: var(--quiet); font: .61rem var(--mono); }
.archive-controls { display: flex; flex-wrap: wrap; gap: 14px; align-items: end; margin-bottom: 18px; }
.field { display: grid; gap: 6px; min-width: min(100%, 190px); }
.field label { color: var(--quiet); font: .69rem var(--mono); letter-spacing: .06em; text-transform: uppercase; }
select { min-height: 46px; padding: 0 38px 0 12px; border: 1px solid var(--line); border-radius: 0; color: var(--paper); background: var(--surface-raised); }
.archive-count { margin: 0 0 0 auto; color: var(--quiet); font-size: .78rem; }
.archive-layout { display: grid; grid-template-columns: minmax(240px, .65fr) minmax(0, 1.35fr); border: 1px solid var(--line); background: var(--surface); }
.archive-list { max-height: 520px; overflow-y: auto; border-right: 1px solid var(--line); }
.archive-item { display: grid; grid-template-columns: 1fr auto; gap: 5px 12px; width: 100%; min-height: 66px; padding: 13px 16px; border: 0; border-bottom: 1px solid rgba(243,234,219,.08); background: transparent; text-align: left; cursor: pointer; }
.archive-item:hover, .archive-item[aria-current="true"] { background: rgba(197,162,116,.09); }
.archive-item strong { font-size: .9rem; font-weight: 560; }
.archive-item .symbol { color: var(--gold); font: .72rem var(--mono); }
.archive-item small { grid-column: 1 / -1; color: var(--quiet); font-size: .72rem; }
.archive-detail { display: flex; flex-direction: column; justify-content: space-between; min-height: 260px; padding: clamp(24px, 4vw, 40px); }
.detail-open { width: fit-content; min-height: 42px; margin-top: 24px; padding: 0 13px; border: 1px solid var(--line); color: var(--paper); background: transparent; cursor: pointer; font-size: .77rem; }
.detail-open:hover { border-color: var(--gold); color: var(--gold); }
.detail-top { display: flex; justify-content: space-between; align-items: start; gap: 16px; }
.detail-top h3 { margin: 0 0 3px; font-size: 1.5rem; font-weight: 560; }
.detail-top p { margin: 0; color: var(--quiet); font-size: .78rem; }
.detail-value { color: var(--green); font: 500 1.6rem var(--mono); white-space: nowrap; }
.detail-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--line); }
.detail-meta span { display: block; color: var(--quiet); font-size: .71rem; }
.detail-meta strong { display: block; margin-top: 4px; color: var(--paper); font: 500 .9rem var(--mono); }
.archive-caveat { margin: 12px 0 0; color: var(--quiet); font-size: .75rem; }
.archive-caveat summary { width: fit-content; cursor: pointer; color: var(--muted); }
.archive-caveat p { max-width: 86ch; margin: 10px 0 0; }
.method-grid { display: grid; grid-template-columns: .7fr 1.3fr; gap: clamp(35px, 8vw, 110px); align-items: start; }
.method-grid h2 { max-width: 11ch; margin: 0; font-size: clamp(2.15rem, 4.3vw, 3.5rem); line-height: 1.02; font-weight: 520; letter-spacing: -.045em; }
.method-grid .method-intro { margin-top: 18px; color: var(--muted); font-size: .9rem; }
.method-list { border-top: 1px solid var(--line); }
.method-list details { border-bottom: 1px solid var(--line); }
.method-list summary { display: flex; justify-content: space-between; align-items: center; min-height: 65px; gap: 20px; cursor: pointer; list-style: none; font-size: .97rem; font-weight: 540; }
.method-list summary::-webkit-details-marker { display: none; }
.method-list summary::after { content: "+"; color: var(--gold); font: 1.2rem var(--mono); }
.method-list details[open] summary::after { content: "−"; }
.method-list details p { max-width: 62ch; padding: 0 36px 18px 0; color: var(--muted); font-size: .86rem; }
.preview { display: grid; grid-template-columns: .75fr 1.25fr; border: 1px solid var(--line); background: var(--surface); }
.preview-copy { padding: clamp(25px, 4vw, 42px); border-right: 1px solid var(--line); }
.preview-copy h2 { margin: 0 0 13px; font-size: clamp(1.8rem, 3.3vw, 2.7rem); line-height: 1.02; font-weight: 520; letter-spacing: -.04em; }
.preview-copy p { margin: 0; color: var(--muted); font-size: .88rem; }
.preview-tabs { display: flex; gap: 4px; padding: 17px 19px 0; border-bottom: 1px solid var(--line); }
.preview-tab { min-height: 44px; padding: 0 14px; border: 0; border-bottom: 2px solid transparent; color: var(--quiet); background: transparent; cursor: pointer; font-size: .79rem; }
.preview-tab[aria-selected="true"] { border-bottom-color: var(--gold); color: var(--paper); }
.preview-screen { min-height: 245px; padding: 25px; }
.preview-screen h3 { margin-bottom: 8px; font-size: 1rem; font-weight: 560; }
.preview-screen p { max-width: 58ch; color: var(--muted); font-size: .86rem; }
.preview-mini { display: grid; grid-template-columns: 1fr auto; gap: 12px; max-width: 420px; margin-top: 22px; padding: 14px; border: 1px solid var(--line); color: var(--muted); font-size: .75rem; }
.preview-mini b { color: var(--gold); font: 500 .78rem var(--mono); }
.pricing { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: clamp(26px, 5vw, 50px); border: 1px solid var(--line); background: linear-gradient(120deg, rgba(197,162,116,.08), transparent 55%), var(--surface); }
.pricing h2 { margin: 0 0 8px; font-size: clamp(1.7rem, 3.4vw, 2.7rem); font-weight: 520; letter-spacing: -.04em; }
.pricing p { margin: 0; color: var(--muted); font-size: .88rem; }
.price { flex: 0 0 auto; text-align: right; }
.price strong { display: block; font: 500 1.6rem var(--mono); }
.price span { display: block; color: var(--quiet); font-size: .75rem; }
.button-link { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; margin-top: 14px; padding: 0 18px; border: 1px solid var(--gold); color: var(--bg); background: var(--gold); text-decoration: none; font-size: .84rem; font-weight: 650; }
.button-link:hover { background: var(--paper); border-color: var(--paper); }
footer { padding: 28px 0 34px; border-top: 1px solid rgba(243,234,219,.1); color: var(--quiet); font-size: .76rem; }
.foot { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 20px; }
.foot-links a { display: inline-flex; min-height: 44px; align-items: center; text-decoration: none; }
.legal { display: flex; justify-content: space-between; gap: 18px; margin-top: 20px; padding-top: 15px; border-top: 1px solid rgba(243,234,219,.07); font-size: .68rem; }
.legal p { margin: 0; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
@media (max-width: 850px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { max-width: 740px; }
  .hero h1 { max-width: 15ch; }
  .section-heading { grid-template-columns: 1fr; gap: 15px; }
  .section-heading h2 { max-width: 18ch; }
  .method-grid { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 640px) {
  .wrap { width: min(var(--max), calc(100% - 32px)); }
  .nav { min-height: 62px; }
  .nav-links { display: none; }
  .hero { padding-top: 45px; }
  .hero-grid { gap: 27px; }
  .demo-head, .demo-instrument { padding-inline: 16px; }
  .demo-step { min-height: 78px; padding: 11px 7px; }
  .step-label { font-size: .68rem; }
  .demo-explanation { padding-inline: 16px; }
  .stage-control { padding-inline: 16px; }
  .disclosure { padding-inline: 16px; }
  .overview { grid-template-columns: 1fr; }
  .overview-intro { border-right: 0; border-bottom: 1px solid var(--line); padding: 22px; }
  .summary-side { grid-template-columns: auto 1fr; align-items: center; padding: 20px 22px; }
  .summary-count { grid-row: span 2; }
  .summary-state, .summary-time { grid-column: 1 / -1; }
  .summary-breakdown { grid-template-columns: 1fr; }
  .summary-toggle { grid-template-columns: 1fr 1fr; border-right: 0; border-bottom: 1px solid var(--line); }
  .summary-toggle button { text-align: center; }
  .summary-toggle button[aria-selected="true"] { box-shadow: inset 0 -2px var(--gold); }
  .breakdown-list { padding: 16px; }
  .breakdown-row { grid-template-columns: minmax(66px,auto) minmax(36px,1fr) auto; gap: 7px; font-size: .69rem; }
  .archive-controls { align-items: stretch; }
  .field { flex: 1 1 145px; min-width: 0; }
  .archive-count { flex: 1 0 100%; margin: 2px 0 0; }
  .archive-layout { grid-template-columns: 1fr; }
  .archive-list { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); max-height: 245px; border-right: 0; border-bottom: 1px solid var(--line); }
  .archive-item { min-height: 64px; padding: 11px; }
  .archive-item:nth-child(odd) { border-right: 1px solid rgba(243,234,219,.08); }
  .archive-detail { min-height: 220px; padding: 22px; }
  .detail-meta { margin-top: 24px; }
  .preview { grid-template-columns: 1fr; }
  .preview-copy { border-right: 0; border-bottom: 1px solid var(--line); }
  .preview-tabs { overflow-x: auto; padding-inline: 10px; }
  .preview-tab { padding-inline: 10px; white-space: nowrap; }
  .preview-screen { min-height: 225px; padding: 20px; }
  .pricing { align-items: flex-start; flex-direction: column; }
  .price { text-align: left; }
  .foot, .legal { align-items: flex-start; flex-direction: column; }
  .foot-links { gap: 13px 18px; }
}
@media (max-width: 360px) {
  .brand { font-size: .86rem; }
  .language { gap: 5px; font-size: .68rem; }
  .demo-state { font-size: .6rem; }
  .demo-step { padding-inline: 5px; }
  .step-label { font-size: .61rem; }
  .archive-list { grid-template-columns: 1fr; }
  .archive-item:nth-child(odd) { border-right: 0; }
  .archive-detail { padding: 18px; }
  .breakdown-list { grid-template-columns: 1fr; gap: 10px; }
  .breakdown-row { grid-template-columns: minmax(64px,auto) minmax(30px,1fr) auto; gap: 8px; }
  .detail-top { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}