:root {
  --paper: #ffffff;
  --paper-2: #f6f4ef;
  --screen: #eceae4;
  --ink: #1a1917;
  --ink-dim: #5c5852;
  --ink-faint: #8c877e;
  --copper: #c2410c;
  --copper-dark: #9a3412;
  --signal: #0f766e;
  --warn: #b42318;
  --rule: #e8e4dc;
  --rule-firm: #cfc9bc;
  --display: "Bitstream Charter", Charter, "Liberation Serif", Georgia, "Times New Roman", serif;
  --sans: "Liberation Sans", Carlito, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --mono: "Source Code Pro", "Liberation Mono", ui-monospace, monospace;
  --wrap: 1120px;
  --measure: 68ch;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--screen);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--copper-dark); }
a:hover { color: var(--copper); }
:focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; }

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--ink);
  color: white;
  padding: 8px 12px;
  z-index: 10;
}
.skip:focus { top: 12px; }

.wrap {
  width: min(var(--wrap), calc(100% - 40px));
  margin: 0 auto;
}
.sheet {
  background: var(--paper);
  min-height: 100vh;
}

/* ---------- header ---------- */
.site-header {
  background: var(--paper);
  border-bottom: 2px solid var(--copper);
  position: sticky;
  top: 0;
  z-index: 20;
}
.bar {
  width: min(var(--wrap), calc(100% - 40px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}
.brand-logo {
  display: block;
  height: 54px;
  width: auto;
}
.brand-tag {
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-size: 10px;
  max-width: 11rem;
  line-height: 1.35;
}
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--rule-firm);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}
.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--ink);
  content: "";
  position: relative;
}
.nav-toggle-label span::before { position: absolute; top: -6px; }
.nav-toggle-label span::after { position: absolute; top: 6px; }
.site-nav { display: flex; gap: 4px; align-items: center; }
.site-nav a {
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.04em;
  padding: 8px 12px;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a.active {
  color: var(--ink);
  box-shadow: inset 0 -2px 0 var(--copper);
}
.site-nav a.nav-contact {
  border: 1px solid var(--ink);
  color: var(--ink);
  margin-left: 8px;
}
.site-nav a.nav-contact:hover,
.site-nav a.nav-contact.active {
  background: var(--ink);
  color: white;
  box-shadow: none;
}

/* ---------- type ---------- */
.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--copper-dark);
  margin: 0 0 12px;
}
h1, h2, h3, h4 { font-family: var(--display); font-weight: 700; letter-spacing: -0.015em; }
h1 {
  font-size: clamp(2.5rem, 5.4vw, 4.35rem);
  line-height: 0.98;
  margin: 0 0 18px;
  max-width: 14ch;
}
h2 { font-size: clamp(1.7rem, 3vw, 2.35rem); line-height: 1.15; margin: 0 0 12px; }
h3 { font-size: 1.35rem; line-height: 1.25; margin: 0 0 8px; }
.lede { font-size: 1.12rem; color: var(--ink-dim); max-width: var(--measure); margin: 0 0 22px; }
p { margin: 0 0 12px; }
.dim { color: var(--ink-dim); }
.measure { max-width: var(--measure); }

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: end;
  padding: 56px 0 28px;
}
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }

.button, button.button {
  display: inline-block;
  background: var(--copper);
  color: white;
  text-decoration: none;
  border: 1px solid var(--copper);
  padding: 12px 18px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.01em;
  cursor: pointer;
}
.button:hover { background: var(--copper-dark); border-color: var(--copper-dark); color: white; }
.button.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.button.ghost:hover { background: var(--ink); color: white; }

.rule { border: 0; border-top: 1px solid var(--rule); margin: 0; }

.section { padding: 56px 0; }
.section-head { margin-bottom: 28px; max-width: 70ch; }
.section-head h2 { max-width: 22ch; }

/* ---------- shaft diagram ---------- */
.diagram {
  background: var(--paper-2);
  padding: 18px 16px 12px;
  border-top: 1px solid var(--rule-firm);
}
.diagram svg { width: 100%; height: auto; }
.diagram figcaption { margin-top: 8px; }

/* ---------- products ---------- */
.product-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 18px;
}
.card {
  background: var(--paper);
  border: 1px solid var(--rule-firm);
  padding: 22px 22px 20px;
  display: flex;
  flex-direction: column;
}
.card.feature {
  background: var(--ink);
  color: #f4f1ea;
  border-color: var(--ink);
  grid-row: span 2;
}
.card.feature .kicker { color: #fdba74; }
.card.feature a { color: #fdba74; }
.card.feature p { color: #d6d1c7; }
.card h3 { font-size: 1.7rem; }
.card .index {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
  margin-bottom: 10px;
}
.card.feature .index { color: #a8a29a; }
.card ul { margin: 8px 0 16px; padding-left: 18px; }
.card li { margin: 0 0 6px; }
.card .more { margin-top: auto; font-weight: 650; }

.stack { display: grid; gap: 18px; }
.stack .card h3 { font-size: 1.45rem; }

/* ---------- chain ---------- */
.chain {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule-firm);
  border-bottom: 1px solid var(--rule-firm);
}
.chain article {
  padding: 22px 20px 24px 0;
  padding-right: 22px;
  border-right: 1px solid var(--rule);
}
.chain article:last-child { border-right: 0; padding-right: 0; }
.chain .n {
  font-family: var(--mono);
  color: var(--copper-dark);
  font-size: 13px;
  letter-spacing: 0.08em;
}
.chain h3 { font-size: 1.25rem; margin-top: 6px; }
.chain p { color: var(--ink-dim); font-size: 15px; margin: 0; }

/* ---------- figures ---------- */
.figure {
  margin: 0 0 28px;
}
.figure .frame {
  background: white;
  border: 1px solid var(--rule);
  padding: 8px;
}
.figure img { width: 100%; height: auto; }
.figure figcaption {
  margin-top: 8px;
  color: var(--ink-dim);
  font-size: 14.5px;
  max-width: 85ch;
}
.figure figcaption b { color: var(--ink); font-weight: 650; }
.fig-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px 28px;
}

.spec {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  margin: 18px 0 8px;
}
.spec div { padding: 12px 16px 14px 0; }
.spec .num {
  font-family: var(--display);
  font-size: 1.55rem;
  display: block;
  line-height: 1.1;
}
.spec .lbl {
  display: block;
  margin-top: 4px;
  color: var(--ink-dim);
  font-size: 13px;
}

.hold {
  border-left: 3px solid var(--copper);
  padding: 4px 0 4px 18px;
  margin: 22px 0;
  max-width: 68ch;
}
.hold p { font-family: var(--display); font-size: 1.35rem; line-height: 1.35; margin: 0; }

.ladder { width: 100%; border-collapse: collapse; margin: 8px 0 0; }
.ladder th {
  text-align: left;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
  padding: 8px 16px 8px 0;
  border-bottom: 1px solid var(--ink);
}
.ladder td {
  vertical-align: top;
  padding: 12px 16px 12px 0;
  border-bottom: 1px solid var(--rule);
}
.ladder td:first-child {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--copper-dark);
  white-space: nowrap;
  width: 9.5rem;
}

.note {
  background: var(--paper-2);
  padding: 18px 20px;
  border-left: 3px solid var(--signal);
  max-width: 78ch;
}
.note p:last-child { margin: 0; }

.prose h2 { margin-top: 8px; }
.prose h3 { margin-top: 22px; }
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
}
.split ul { margin: 8px 0 0; padding-left: 18px; }
.split li { margin: 0 0 8px; }

/* ---------- contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 36px;
  align-items: start;
}
.facts { border-top: 1px solid var(--ink); }
.facts div { padding: 14px 0; border-bottom: 1px solid var(--rule); }
.facts h3 { font-family: var(--sans); font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; margin: 0 0 4px; }
.facts p { margin: 0; color: var(--ink-dim); }
.ids {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  line-height: 1.7;
}
label { display: block; font-size: 13px; letter-spacing: 0.04em; margin-bottom: 6px; }
input, select, textarea {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: white;
  border: 1px solid var(--rule-firm);
  padding: 10px 12px;
  border-radius: 0;
}
textarea { resize: vertical; }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 16px; }
.fields .full { grid-column: 1 / -1; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--ink-dim); }
.check input { width: auto; margin-top: 4px; }
.form-card { border: 1px solid var(--rule-firm); padding: 22px; }

.faq details { border-bottom: 1px solid var(--rule); }
.faq summary {
  cursor: pointer;
  padding: 14px 0;
  font-weight: 650;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--copper-dark); font-family: var(--mono); flex: none; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 14px; color: var(--ink-dim); max-width: 75ch; }

.flash-wrap { width: min(var(--wrap), calc(100% - 40px)); margin: 16px auto 0; }
.flash {
  padding: 12px 14px;
  margin-bottom: 8px;
  border: 1px solid var(--rule-firm);
  background: var(--paper-2);
}
.flash.success { border-left: 3px solid var(--signal); }
.flash.danger { border-left: 3px solid var(--warn); }

/* ---------- footer ---------- */
.site-footer {
  background: var(--ink);
  color: #d6d1c7;
  padding: 36px 0 22px;
}
.site-footer a { color: #fdba74; text-decoration: none; }
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 24px;
}
.site-footer h2 {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: white;
  margin: 0 0 10px;
}
.site-footer p, .site-footer li { font-size: 14.5px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 0 0 6px; }
.legal {
  margin-top: 22px;
  padding-top: 14px;
  border-top: 1px solid #3f3c38;
  font-size: 12.5px;
  color: #a8a29a;
}

.page-hero { padding: 48px 0 8px; }
.page-hero h1 { max-width: 20ch; }
.prose ol, .split ol { margin: 8px 0 16px; padding-left: 1.2rem; }
.prose li, .split li { margin: 0 0 8px; }
.card.feature li { color: #e7e2d8; }

@media (max-width: 860px) {
  .brand-tag { display: none; }
  .brand-logo { height: 41px; }
  .nav-toggle-label { display: flex; }
  .site-nav {
    display: none;
    position: absolute;
    left: 0; right: 0;
    top: 100%;
    background: var(--paper);
    border-bottom: 2px solid var(--copper);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 20px 16px;
    gap: 0;
  }
  .nav-toggle:checked ~ .site-nav { display: flex; }
  .site-nav a { padding: 12px 0; border-bottom: 1px solid var(--rule); }
  .site-nav a.nav-contact { margin: 10px 0 0; text-align: center; }
  .hero, .product-grid, .chain, .fig-grid, .spec, .split, .contact-grid, .foot-grid, .fields {
    grid-template-columns: 1fr;
  }
  .card.feature { grid-row: auto; }
  .chain article { border-right: 0; border-bottom: 1px solid var(--rule); padding: 16px 0; }
  .spec div { padding: 10px 0; border-bottom: 1px solid var(--rule); }
  h1 { max-width: none; }
  .ladder, .ladder tbody, .ladder tr, .ladder th, .ladder td { display: block; width: auto; white-space: normal; }
  .ladder thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .ladder td { border-bottom: 0; }
  .ladder td:first-child { padding-bottom: 0; font-weight: 700; }
  .ladder tr { padding: 12px 0 4px; border-bottom: 1px solid var(--rule); }
  .wrap, .bar, .flash-wrap { width: min(var(--wrap), calc(100% - 28px)); }
}

/* ---- Propeller prototyping launch (home page) ---- */
.launch { background: var(--ink); color: #f4f1ea; padding: 52px 0 30px; margin-top: 12px; }
.launch-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: center; }
.launch h2 { color: #fff; font-size: clamp(1.9rem, 3.4vw, 2.7rem); line-height: 1.12; margin: 0 0 14px; }
.launch .kicker { color: #fdba74; }
.launch .lede { color: #d6d1c7; }
.launch .badge { display: inline-block; background: var(--copper); color: #fff; padding: 2px 9px; margin-right: 8px; letter-spacing: 0.1em; }
.launch .button.ghost { color: #f4f1ea; border-color: #8c877e; background: transparent; }
.launch .button.ghost:hover { border-color: #fdba74; color: #fdba74; }
.launch-hero { margin: 0; }
.launch-hero img { width: 100%; background: #10141a; border: 1px solid #34312c; }
.launch-spec { border-color: #5c5852; margin-top: 30px; }
.launch-spec .num { color: #fff; }
.launch-spec .lbl { color: #b9b3a8; }
.strengths, .routes { display: grid; gap: 18px; }
.strengths { grid-template-columns: repeat(3, 1fr); }
.routes { grid-template-columns: 1fr 1fr; margin-bottom: 22px; }
.strengths .card h3, .routes .card h3 { font-size: 1.3rem; }
.strengths .card .index, .routes .card .index { color: var(--copper-dark); }
.prop-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-bottom: 26px; }
.prop { margin: 0; border: 1px solid var(--rule-firm); background: var(--paper); }
.prop img { width: 100%; aspect-ratio: 1 / 1; object-fit: contain; padding: 10px; }
.prop figcaption { padding: 12px 14px 14px; border-top: 1px solid var(--rule); font-size: 14px; }
.prop figcaption b { display: block; font-family: var(--display); font-size: 1.12rem; margin-bottom: 2px; }
.prop figcaption span { display: block; color: var(--ink-dim); }
.prop .chip { display: inline-block; margin-top: 8px; padding: 2px 9px; font-size: 12.5px; font-weight: 650; border: 1px solid currentColor; }
.prop .chip.ok { color: var(--signal); }
.prop .chip.bad { color: var(--warn); }
.prop .chip.hold-chip { color: var(--copper-dark); }
.fig-grid.three { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 860px) {
  .launch-grid, .strengths, .routes, .fig-grid.three { grid-template-columns: 1fr; }
  .prop-grid { grid-template-columns: 1fr 1fr; }
  .launch { padding: 36px 0 18px; }
}

/* Home: service overview first, with technical evidence on demand. */
.home-page .hero { align-items: center; gap: 36px; padding: 48px 0 36px; }
.home-page h1 { font-size: clamp(2.25rem, 4.2vw, 3.5rem); line-height: 1.08; max-width: 18ch; }
.home-page .lede { font-size: 1.05rem; }
.home-page .diagram { margin: 0; padding: 16px; }
.home-page .diagram figcaption { font-size: 13px; }
.home-page .section { padding: 36px 0; }
.home-services { border-top: 1px solid var(--rule); }
.home-page .section-head { max-width: 80ch; margin-bottom: 22px; }
.home-page .section-head h2 { max-width: none; }
.home-page .product-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.home-page .card { padding: 22px; }
.home-page .card h3 { font-size: 1.4rem; }
.home-page .card p { font-size: 15px; }
.home-page .card .index { font-size: 11px; }
.home-page .card .more { font-size: 14px; padding-top: 8px; }
.home-page .launch { margin-top: 0; padding: 36px 0 24px; }
.home-page .launch-grid { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); gap: 32px; }
.home-page .launch h2 { font-size: clamp(1.65rem, 2.8vw, 2.2rem); }
.home-page .launch-hero { width: 100%; max-width: 320px; justify-self: end; }
.home-page .launch-hero img { height: 240px; object-fit: contain; }
.home-page .launch-spec { margin-top: 24px; }
.home-page .launch-spec .num { font-size: 1.35rem; }
.home-evidence { padding-top: 24px; padding-bottom: 36px; }
.home-details { border-bottom: 1px solid var(--rule-firm); }
.home-details summary { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 0; cursor: pointer; list-style: none; }
.home-details summary::-webkit-details-marker { display: none; }
.home-details summary .kicker { display: block; margin-bottom: 5px; font-size: 11px; }
.detail-title { display: block; font-family: var(--display); font-size: 1.4rem; line-height: 1.25; }
.detail-hint { color: var(--copper-dark); font-size: 13px; flex-shrink: 0; }
.detail-hint::after { content: " +"; font-size: 20px; }
.home-details[open] .detail-hint::after { content: " −"; }
.home-details .wrap { width: 100%; }
.home-details .section:first-child { padding-top: 12px; }
.home-page .prop img { height: 160px; aspect-ratio: auto; object-fit: contain; }
.home-page .figure .frame { display: flex; justify-content: center; }
.home-page .figure img { width: 100%; height: 220px; object-fit: contain; }
.home-page .figure figcaption { font-size: 13px; }
.home-contact { padding: 32px 0; background: var(--paper-2); border-top: 1px solid var(--rule); }
.home-contact-grid { display: flex; justify-content: space-between; align-items: center; gap: 32px; }
.home-contact h2 { font-size: 1.8rem; }
.home-contact p { max-width: 62ch; margin-bottom: 0; }
.home-contact .kicker { margin-bottom: 8px; }
.home-contact .actions { flex-shrink: 0; }
.home-page [id] { scroll-margin-top: 100px; }
@media (max-width: 860px) {
  .home-page .hero { grid-template-columns: 1fr; gap: 24px; padding-top: 32px; }
  .home-page .diagram { width: 100%; max-width: 480px; }
  .home-page .launch-grid { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 20px; }
  .home-page .launch-hero img { height: 200px; }
  .home-page .launch-spec { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 18px; }
  .home-contact-grid { flex-direction: column; align-items: flex-start; gap: 16px; }
}
@media (max-width: 560px) {
  .home-page .product-grid, .home-page .launch-grid { grid-template-columns: 1fr; }
  .home-page .launch-hero { justify-self: center; max-width: 260px; }
  .home-page .prop-grid { gap: 10px; }
  .home-page .prop img { height: 130px; }
  .home-page .prop figcaption { padding: 10px; font-size: 12px; }
  .home-details summary { align-items: flex-start; }
  .detail-title { font-size: 1.2rem; }
  .detail-hint { font-size: 0; }
  .detail-hint::after { font-size: 24px; }
  .home-page .figure img { height: auto; max-height: 240px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* ---- Home page, revision 3: clear hierarchy, a visible announcement, a clean propeller cut-out ---- */
.announce { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 4px 14px; padding: 10px 20px;
  background: var(--ink); color: #f4f1ea; text-decoration: none; font-size: 14px; text-align: center; }
.announce:hover { background: #000; color: #fff; }
.announce .badge { background: var(--copper); color: #fff; padding: 1px 8px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; }
.announce .go { color: #fdba74; font-weight: 650; white-space: nowrap; }

.home-page .hero { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 56px; padding: 60px 0 52px; }
.home-page h1 { font-size: clamp(2rem, 3.3vw, 2.9rem); line-height: 1.1; max-width: 22ch; }
.home-page .hero .actions { margin-top: 24px; }
.home-page .diagram { background: var(--paper-2); border: 1px solid var(--rule); border-top: 3px solid var(--copper); padding: 26px 26px 20px; }
.home-page .diagram figcaption { font-size: 13.5px; margin-top: 12px; }

.home-page .section { padding: 52px 0; }
.home-page .section-head { margin-bottom: 26px; }
.home-page .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.home-page .card.lead { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px 48px; align-items: start;
  background: var(--paper-2); border-top: 3px solid var(--copper); padding: 28px 30px; }
.home-page .card.lead ul { align-self: center; }
.home-page h1, .home-page h2, .home-page h3, .home-page .detail-title { text-wrap: balance; }
.home-page .card.lead h3 { font-size: 1.75rem; }
.home-page .card.lead p { font-size: 16px; }
.home-page .card.lead .index { color: var(--copper-dark); letter-spacing: 0.14em; text-transform: uppercase; }
.home-page .card.lead ul { margin: 6px 0 20px; padding-left: 18px; }
.home-page .card.lead li { font-size: 15px; color: var(--ink-dim); }
.home-page .card:not(.lead) { padding: 20px 22px; }
.home-page .card:not(.lead) h3 { font-size: 1.25rem; }

.home-page .launch { padding: 56px 0 36px; }
.home-page .launch-grid { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 48px; align-items: center; }
.home-page .launch-hero { max-width: 340px; justify-self: center; }
.home-page .launch-hero img { height: auto; max-height: 300px; width: auto; max-width: 100%; margin: 0 auto; background: none; border: 0; object-fit: contain; }
.home-page .launch .lede { max-width: 56ch; }
.home-page .launch-spec { margin-top: 32px; }

.home-evidence { display: grid; gap: 12px; padding-top: 44px; padding-bottom: 52px; }
.home-details { border: 1px solid var(--rule-firm); background: var(--paper); }
.home-details summary { align-items: flex-start; padding: 20px 24px; }
.home-details summary:hover { background: var(--paper-2); }
.home-details summary:focus-visible { outline: 2px solid var(--copper); outline-offset: -2px; }
.home-details[open] summary { border-bottom: 1px solid var(--rule); }
.detail-teaser { display: block; margin-top: 6px; font-family: var(--sans); font-size: 14.5px; line-height: 1.45; color: var(--ink-dim); max-width: 70ch; }
.home-details .detail-hint { align-self: center; font-weight: 650; }
.home-details .detail-content { padding: 6px 24px 24px; }

.home-contact { padding: 44px 0; }

@media (max-width: 860px) {
  .home-page .hero { grid-template-columns: 1fr; gap: 28px; padding: 36px 0 36px; }
  .home-page .diagram { max-width: none; width: 100%; }
  .home-page .product-grid { grid-template-columns: 1fr; }
  .home-page .card.lead { grid-template-columns: 1fr; padding: 22px; }
  .home-page .launch-grid { grid-template-columns: 1fr; gap: 24px; }
  .home-page .launch-hero { justify-self: center; max-width: 230px; }
  .home-details summary { flex-direction: column; gap: 10px; }
  .home-details .detail-hint { align-self: flex-start; }
}

/* ======================================================================
   Home page, revision 4: the banner, the interactive propeller, the design spiral
   ====================================================================== */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- banner ---------- */
.banner { position: relative; overflow: hidden; color: #f4f1ea; border-bottom: 3px solid var(--copper);
  background: linear-gradient(180deg, #100e0c 0%, #1a1917 100%); }
.banner::before { content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(55% 95% at 80% 48%, rgba(194, 65, 12, 0.34), transparent 64%),
    linear-gradient(rgba(255, 255, 255, 0.032) 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(90deg, rgba(255, 255, 255, 0.032) 1px, transparent 1px) 0 0 / 44px 44px; }
.banner-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.72fr); gap: 36px; align-items: center; padding: 38px 0 34px; }
.banner-kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: #fdba74; margin: 0 0 14px; }
.banner-kicker .badge { display: inline-block; background: var(--copper); color: #fff; padding: 1px 9px; margin-right: 10px; letter-spacing: 0.12em; }
.banner h2 { color: #fff; font-size: clamp(2rem, 4vw, 3.1rem); line-height: 1.08; letter-spacing: -0.022em; margin: 0 0 16px; max-width: 22ch; text-wrap: balance; }
.banner h2 em { font-style: normal; color: #fdba74; background: linear-gradient(transparent 84%, rgba(194, 65, 12, 0.7) 84%); padding: 0 2px; }
.banner-lede { font-size: 1.1rem; line-height: 1.55; color: #d6d1c7; max-width: 60ch; margin: 0 0 22px; }
.banner .button.ghost { color: #f4f1ea; border-color: #8c877e; background: transparent; }
.banner .button.ghost:hover { border-color: #fdba74; color: #fdba74; background: transparent; }
.banner-foot { font-size: 13.5px; line-height: 1.5; color: #a39d90; max-width: 62ch; margin: 18px 0 0; }
.banner-foot a { color: #fdba74; }
.banner-clock { margin: 0; justify-self: center; width: 100%; max-width: 380px; }
.banner-clock figcaption { font-size: 12.5px; line-height: 1.45; color: #8c877e; text-align: center; margin-top: 8px; }
.clock { display: block; width: 100%; height: auto; overflow: visible; }   /* no CSS filter: WebKit paints it as a dark disc */
.clock .tk { stroke: #5f594f; stroke-width: 1.2; }
.clock .tk.major { stroke: #cfc8ba; stroke-width: 2.2; }
.clock .tl { fill: #9b9588; font: 12px var(--mono); }
.clock .track { stroke: #2d2a25; stroke-width: 14; }
.clock .arc { stroke: var(--copper); stroke-width: 14; stroke-dashoffset: var(--len); animation: clock-sweep 1.5s cubic-bezier(0.2, 0.7, 0.15, 1) 0.25s both; }
.clock .arc.range { stroke: #fdba74; animation: clock-range 0.5s ease 1.55s both; stroke-dashoffset: 0; }
.clock .dot { fill: #fff; stroke: var(--copper); stroke-width: 2.4; opacity: 0; animation: clock-range 0.4s ease 1.75s both; }
.clock .hand { stroke: #fff; stroke-width: 3; stroke-linecap: round; transform-box: view-box; transform-origin: 200px 200px; animation: clock-hand 1.5s cubic-bezier(0.2, 0.7, 0.15, 1) 0.25s both; }
.clock .hub { fill: var(--copper); stroke: #fff; stroke-width: 2; }
.clock .big { font: 700 64px var(--display); fill: #fff; letter-spacing: -0.02em; }
.clock .unit { font-size: 26px; fill: #fdba74; }
.clock .small { font: 13.5px var(--sans); fill: #b9b3a8; }
.clock .small.cap { font: 600 10.5px var(--mono); letter-spacing: 0.16em; fill: #8c877e; }
@keyframes clock-sweep { from { stroke-dashoffset: var(--len); } to { stroke-dashoffset: 0; } }
@keyframes clock-range { from { opacity: 0; } to { opacity: 1; } }
@keyframes clock-hand { from { transform: rotate(-266deg); } to { transform: rotate(0deg); } }

/* ---------- the black band, with the interactive propeller ---------- */
.home-page .launch-grid { grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.12fr); gap: 40px; align-items: center; }
.home-page .launch-hero.viewer { max-width: none; width: 100%; justify-self: stretch; margin: 0; }
.viewer [hidden] { display: none !important; }
.viewer-stage { position: relative; height: clamp(340px, 42vw, 500px); border: 1px solid #3a3731; border-radius: 6px; overflow: hidden;
  background: radial-gradient(125% 95% at 50% 36%, #3a352e 0%, #211e1a 52%, #100e0c 100%); box-shadow: inset 0 0 70px rgba(0, 0, 0, 0.5); }
.viewer.is-mesh .viewer-stage { background: radial-gradient(125% 95% at 50% 36%, #1f2c3a 0%, #121b26 55%, #090d12 100%); }
.viewer-poster { position: absolute; inset: 5%; width: 90%; height: 90%; max-width: none; object-fit: contain; background: none; border: 0; }
.viewer.is-ready .viewer-poster { display: none; }
.viewer-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; cursor: grab; touch-action: pan-y; outline-offset: -4px; }
.viewer.is-active .viewer-canvas { touch-action: none; }
.viewer-canvas:active { cursor: grabbing; }
.viewer-loading { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: flex; align-items: center; gap: 10px;
  background: rgba(16, 14, 12, 0.78); color: #e5dfd3; font-size: 13px; padding: 9px 14px; border-radius: 4px; }
.spin { width: 15px; height: 15px; border: 2px solid #5c5852; border-top-color: #fdba74; border-radius: 50%; animation: viewer-spin 0.8s linear infinite; }
@keyframes viewer-spin { to { transform: rotate(360deg); } }
.viewer-hint { position: absolute; left: 12px; bottom: 10px; margin: 0; max-width: calc(100% - 24px); font-size: 12px; color: #c9c2b4; background: rgba(16, 14, 12, 0.66);
  padding: 4px 10px; border-radius: 3px; pointer-events: none; transition: opacity 0.6s ease; }
.viewer-hint.is-quiet { opacity: 0; }
.viewer-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; margin-top: 12px; }
.vgroup { display: flex; gap: 6px; }
.vgroup.seg { gap: 0; border: 1px solid #6b655b; border-radius: 4px; overflow: hidden; }
.vchip { font: 600 13px var(--sans); color: #e5dfd3; background: transparent; border: 1px solid #6b655b; border-radius: 4px; padding: 7px 13px; min-height: 36px; cursor: pointer; line-height: 1.2; }
.vgroup.seg .vchip { border: 0; border-radius: 0; }
.vgroup.seg .vchip + .vchip { border-left: 1px solid #6b655b; }
.vchip:hover { border-color: #fdba74; color: #fdba74; }
.vchip:focus-visible { outline: 2px solid #fdba74; outline-offset: 2px; }
.vchip[aria-pressed="true"] { background: var(--copper); border-color: var(--copper); color: #fff; }
.vchip.prop { min-width: 38px; padding: 7px 10px; font-family: var(--mono); }
.viewer-regions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.vchip.region { font-weight: 500; font-size: 12.5px; padding: 5px 10px; min-height: 30px; color: #d6d1c7; border-color: #4f4a42; }
.vchip.region[aria-pressed="true"] { background: #fdba74; border-color: #fdba74; color: #1a1917; font-weight: 650; }
.viewer-caption { margin-top: 12px; font-size: 14px; line-height: 1.45; color: #e5dfd3; }
.viewer-caption span { display: block; color: #a39d90; font-size: 13px; margin-top: 2px; }
.viewer-note { margin: 10px 0 0; font-size: 13px; color: #fdba74; }
.viewer-status { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); margin: 0; }
.viewer:fullscreen { background: #100e0c; padding: 18px; display: flex; flex-direction: column; justify-content: center; max-width: none; }
.viewer:fullscreen .viewer-stage { height: min(72vh, 760px); }

/* ---------- design spiral ---------- */
.spiral-section { background: var(--paper); border-top: 1px solid var(--rule); }
.spiral-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 52px; align-items: start; }
.spiral-fig { margin: 0; position: sticky; top: 92px; }
.spiral { display: block; width: 100%; height: auto; max-width: 560px; margin: 0 auto; }
.spiral .spoke { stroke: #ddd7ca; stroke-width: 1; }
.spiral .spoke.prop { stroke: var(--copper); stroke-width: 2.4; }
.spiral .coil { fill: none; stroke-width: 3.4; stroke-linecap: round; stroke-linejoin: round; }
.spiral .coil.t0 { stroke: #d2cbbd; }
.spiral .coil.t1 { stroke: #b0a99b; }
.spiral .coil.t2 { stroke: #878074; }
.spiral .coil.t3 { stroke: #4f4a43; }
.spiral .head { fill: #4f4a43; }
.spiral .nd { fill: #fff; stroke: #9a948a; stroke-width: 1.5; }
.spiral .nd.prop { fill: var(--copper); stroke: #fff; stroke-width: 2.2; }
.spiral .ndtxt { font: 700 13px var(--sans); fill: #fff; }
.spiral .act { fill: #fff; stroke: #9a948a; stroke-width: 1.6; }
.spiral .act.prop { fill: var(--copper); stroke: var(--copper-dark); }
.spiral .actxt { font: 700 14.5px var(--sans); fill: var(--ink); }
.spiral .act.prop + .actxt { fill: #fff; }
.spiral .core { fill: var(--ink); }
.spiral-key { list-style: none; counter-reset: act; margin: 14px 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px 20px; font-size: 14.5px; }
.spiral-key li { counter-increment: act; display: flex; gap: 9px; align-items: baseline; color: var(--ink-dim); }
.spiral-key li::before { content: counter(act); flex: 0 0 22px; height: 22px; line-height: 20px; text-align: center; border: 1.5px solid #9a948a; border-radius: 50%; font: 700 12px var(--sans); color: var(--ink); background: #fff; }
.spiral-key li.prop { color: var(--ink); font-weight: 650; }
.spiral-key li.prop::before { background: var(--copper); border-color: var(--copper-dark); color: #fff; }
.spiral-fig figcaption { font-size: 13px; line-height: 1.5; color: var(--ink-dim); margin-top: 12px; }
.reasons { display: grid; gap: 18px; }
.reason { border: 1px solid var(--rule-firm); border-left: 4px solid var(--copper); background: var(--paper-2); padding: 18px 22px 12px; }
.reason .index { font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; color: var(--copper-dark); margin: 0 0 6px; }
.reason h3 { font-size: 1.32rem; margin-bottom: 8px; }
.reason p { color: var(--ink-dim); max-width: 64ch; }
.reason b { color: var(--ink); font-weight: 650; }
.reasons-basis { font-size: 13.5px; color: var(--ink-faint); max-width: 66ch; margin: 2px 0 4px; }
.timing { margin-top: 40px; padding: 22px 26px; background: var(--paper-2); border: 1px solid var(--rule); font-size: 14.5px; }
.timing h3 { font-size: 1.1rem; margin-bottom: 10px; }
.timing table { border-collapse: collapse; width: 100%; max-width: 640px; margin: 0 0 12px; font-size: 14px; }
.timing th, .timing td { text-align: left; padding: 5px 14px 5px 0; border-bottom: 1px solid var(--rule); font-weight: 400; }
.timing thead th { font: 600 11.5px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); }
.timing tbody td:last-child { font-family: var(--mono); font-weight: 600; }
.timing p { color: var(--ink-dim); max-width: 78ch; margin: 0; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .banner-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 0.62fr); gap: 24px; padding: 36px 0 32px; }
  .spiral-grid { grid-template-columns: 1fr; gap: 28px; }
  .spiral-fig { position: static; }
  .home-page .launch-grid { grid-template-columns: 1fr; gap: 26px; }
}
@media (max-width: 700px) {
  .banner-grid { grid-template-columns: 1fr; padding: 30px 0 28px; }
  .banner-clock { max-width: 250px; margin-top: 6px; }
  .banner h2 { max-width: none; }
  .viewer-stage { height: clamp(300px, 92vw, 400px); }
  .spiral-key { grid-template-columns: 1fr; }
  .vchip { min-height: 40px; }
  .vchip.region { min-height: 34px; }
  .timing { padding: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  .clock .arc, .clock .arc.range, .clock .dot, .clock .hand { animation: none; stroke-dashoffset: 0; opacity: 1; }
  .spin { animation-duration: 2.4s; }
  .viewer-hint { transition: none; }
}

/* The menu's hidden checkbox was positioned past the right edge on narrow screens, which let every page
   scroll sideways by a few pixels. It stays focusable and invisible; it is simply kept inside the page. */
.nav-toggle { left: 0; top: 0; width: 1px; height: 1px; margin: 0; }