/* ============================================================
   PSIWINGS AEROSPACE — Design System
   Palette: warm-black + graphite + silver + copper (locked from template)
   Fonts: Syne + IBM Plex Mono only
   ============================================================ */

:root {
  --bg:       #050507;
  --bg-2:     #0c0d10;
  --bg-3:     #101216;
  --fg:       #f5f5f7;
  --fg-dim:   #7c8088;
  --fg-dimmer:#4d5058;
  --line:     #1a1c20;
  --line-2:   #26292f;
  --silver:   #c9ccd1;
  --copper:   #d99565;
  --copper-2: #b57544;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Syne', sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  scroll-behavior: smooth;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
img { display: block; max-width: 100%; }

.container { max-width: 100%; padding: 0 48px; }
.container-narrow { max-width: 1480px; margin: 0 auto; padding: 0 48px; }
.mono { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; letter-spacing: 0.06em; }
.serif { font-family: 'Syne', sans-serif; font-style: normal; font-weight: 400; }

/* =========================================================
   NAV
========================================================= */
nav.top {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: linear-gradient(180deg, rgba(5,5,7,0.92) 0%, rgba(5,5,7,0.6) 70%, transparent 100%);
  backdrop-filter: blur(6px);
  padding: 20px 0;
  border-bottom: 1px solid transparent;
  transition: 0.3s;
}
nav.top.scrolled {
  background: rgba(5,5,7,0.95);
  border-bottom-color: var(--line);
  padding: 14px 0;
}
nav.top .row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 40px;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  font-weight: 700; font-size: 16px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--fg);
  flex-shrink: 0;
}
.brand .mark {
  width: 32px; height: 32px; border: 1.5px solid var(--silver); border-radius: 50%;
  display: grid; place-items: center; font-size: 15px; font-weight: 500;
  font-family: 'Syne', sans-serif;
  color: var(--silver);
  line-height: 1;
}
.brand .brand-sub {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp";
  font-size: 9px; letter-spacing: 0.2em; color: var(--fg-dim); font-weight: 400;
  display: block;
  margin-top: 3px;
}
.brand-stack { display: flex; flex-direction: column; line-height: 1; }

/* ============================================================
   PsiWings wordmark — used in nav + footer
   ============================================================ */
.kx-brand {
  /* Reset industrial-caps overrides from .brand base so the SVG owns the look */
  letter-spacing: 0 !important;
  text-transform: none !important;
  font-variant-caps: normal !important;
  padding: 4px 0;
}
.kx-brand .kx-logo {
  display: block;
  width: 220px;
  height: 48px;
  color: var(--fg);
}
/* Aircraft accelerates forward slightly on hover — subtle forward thrust */
.kx-brand .kx-mark {
  transform-origin: 40px 26px;
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}
.kx-brand:hover .kx-mark {
  transform: translateX(3px);
}
/* Footer variant is fuller */
.kx-brand-footer .kx-logo {
  width: 240px;
  height: 52px;
  color: var(--fg);
}

nav.top ul {
  display: flex; list-style: none; gap: 32px;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
}
nav.top ul a { color: var(--fg-dim); transition: 0.2s; position: relative; padding: 6px 0; }
nav.top ul a:hover, nav.top ul a.active { color: var(--fg); }
nav.top ul a.active::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: var(--copper);
}
nav.top ul li { position: relative; }

/* Chevron on submenu triggers — pure CSS diamond that rotates on hover */
nav.top ul .has-sub > a::after {
  content: '';
  display: inline-block;
  width: 5px; height: 5px;
  margin-left: 10px;
  border-right: 1px solid var(--fg-dimmer);
  border-bottom: 1px solid var(--fg-dimmer);
  transform: translateY(-2px) rotate(45deg);
  transition: transform 0.32s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.2s;
  vertical-align: middle;
}
nav.top ul .has-sub:hover > a::after,
nav.top ul .has-sub:focus-within > a::after {
  transform: translateY(1px) rotate(225deg);
  border-color: var(--copper);
}

/* Trigger anchor holds still while submenu is open — invisible bridge is on the submenu */
nav.top ul .has-sub { position: static; }

/* =========================================================
   SUBMENU — elegant modern panel
========================================================= */
/* =========================================================
   SUBMENU — Atelier panel
   Two-column: contextual intro on the left, item list on the right.
   Anchored to the whole nav, not to the trigger — always has generous
   air on both sides regardless of which nav item is hovered.
========================================================= */
.submenu {
  position: absolute;
  top: 100%;
  left: 48px;
  right: 48px;
  max-width: 900px;
  margin: 8px auto 0;
  padding: 40px 48px 32px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 56px;
  background:
    linear-gradient(180deg, rgba(217,149,101,0.05) 0%, transparent 120px),
    rgba(8,9,11,0.96);
  border: 1px solid var(--line-2);
  backdrop-filter: blur(24px) saturate(1.1);
  -webkit-backdrop-filter: blur(24px) saturate(1.1);
  box-shadow:
    0 1px 0 rgba(217,149,101,0.4) inset,
    0 40px 80px -20px rgba(0,0,0,0.9),
    0 0 0 1px rgba(0,0,0,0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity 0.22s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.24s cubic-bezier(0.22, 1, 0.36, 1),
    visibility 0s linear 0.24s;
  pointer-events: none;
  z-index: 60;
}

/* Invisible bridge — spans the ENTIRE horizontal region below the nav so cursor movement
   from any nav trigger toward the panel keeps hover active. */
.submenu::before {
  content: '';
  position: absolute;
  top: -12px; left: -48px; right: -48px; height: 12px;
}

/* Open state — driven ONLY by JS-managed .is-open class
   (CSS :hover removed to avoid fighting the JS grace-period close) */
.submenu.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
  transition:
    opacity 0.24s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.28s cubic-bezier(0.22, 1, 0.36, 1),
    visibility 0s;
}
/* Also update the chevron rotation when JS opens the menu */
nav.top ul .has-sub:has(.submenu.is-open) > a::after {
  transform: translateY(1px) rotate(225deg);
  border-color: var(--copper);
}

/* ---- LEFT COLUMN: intro block ---- */
.submenu .sub-intro { padding-right: 8px; }
.submenu .sub-eyebrow {
  display: flex; align-items: center; gap: 12px;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.24em;
  color: var(--copper); text-transform: uppercase;
  margin-bottom: 20px;
}
.submenu .sub-eyebrow::before {
  content: '';
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--copper);
  box-shadow: 0 0 10px rgba(217,149,101,0.7);
  flex-shrink: 0;
}
.submenu .sub-eyebrow::after {
  content: ''; flex: 1; height: 1px;
  background: linear-gradient(90deg, var(--line-2), transparent);
}
.submenu .sub-title {
  font-family: 'Syne', sans-serif;
  font-size: 24px; font-weight: 500; letter-spacing: -0.015em;
  line-height: 1.15; color: var(--fg);
  margin-bottom: 14px;
}
.submenu .sub-title .accent { color: var(--copper); font-weight: 500; }
.submenu .sub-lede {
  font-family: 'Syne', sans-serif;
  font-size: 13px; line-height: 1.55; color: var(--fg-dim);
  margin-bottom: 24px; max-width: 240px;
}
.submenu .sub-cta {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.2em;
  color: var(--silver) !important; text-transform: uppercase;
  padding: 12px 0;
  border-top: 1px solid var(--line-2);
  transition: color 0.2s, gap 0.2s;
  width: 100%;
}
.submenu .sub-cta::after {
  content: '→'; margin-left: auto; color: var(--fg-dim); transition: color 0.2s, transform 0.2s;
}
.submenu .sub-cta:hover { color: var(--copper) !important; gap: 14px; }
.submenu .sub-cta:hover::after { color: var(--copper); transform: translateX(4px); }

/* ---- RIGHT COLUMN: item list ---- */
.submenu .sub-items {
  display: flex; flex-direction: column;
  border-top: 1px solid var(--line-2);
}
.submenu .sub-items a {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  grid-template-areas:
    "num title go"
    "num sub   go";
  column-gap: 18px;
  row-gap: 2px;
  align-items: center;
  padding: 14px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--fg) !important;
  font-family: 'Syne', sans-serif;
  font-size: 15px; font-weight: 500; letter-spacing: -0.005em;
  line-height: 1.3;
  position: relative;
  transition: padding-left 0.22s cubic-bezier(0.22, 1, 0.36, 1), color 0.2s;
}
.submenu .sub-items a:last-child { border-bottom: none; }
.submenu .sub-items a::before {
  counter-increment: submenu-item;
  content: counter(submenu-item, decimal-leading-zero);
  grid-area: num;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp";
  font-size: 10px; letter-spacing: 0.18em;
  color: var(--fg-dimmer);
  transition: color 0.2s;
  align-self: center;
}
.submenu .sub-items { counter-reset: submenu-item; }

.submenu .sub-items a .title {
  grid-area: title;
  align-self: end;
  display: block;
  font-size: 15px;
  font-weight: 500;
  color: var(--fg);
  line-height: 1.25;
  letter-spacing: -0.005em;
}

.submenu .sub-items a small {
  grid-area: sub;
  display: block;
  align-self: start;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp";
  font-size: 10px; letter-spacing: 0.14em;
  color: var(--fg-dim); font-weight: 400;
  text-transform: uppercase;
  line-height: 1.3;
  transition: color 0.2s;
}
.submenu .sub-items a .go {
  grid-area: go;
  align-self: center;
  font-family: 'Syne', sans-serif;
  font-size: 14px;
  color: var(--fg-dimmer);
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity 0.24s, transform 0.24s, color 0.24s;
}
.submenu .sub-items a::after {
  /* Left-edge indicator that grows on hover */
  content: '';
  position: absolute; left: -12px; top: 50%; transform: translateY(-50%);
  width: 2px; height: 0;
  background: var(--copper);
  transition: height 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}
.submenu .sub-items a:hover,
.submenu .sub-items a:focus-visible {
  padding-left: 12px;
  outline: none;
}
.submenu .sub-items a:hover::before,
.submenu .sub-items a:focus-visible::before { color: var(--copper); }
.submenu .sub-items a:hover small,
.submenu .sub-items a:focus-visible small { color: var(--silver); }
.submenu .sub-items a:hover .go,
.submenu .sub-items a:focus-visible .go {
  opacity: 1; transform: translateX(0); color: var(--copper);
}
.submenu .sub-items a:hover::after,
.submenu .sub-items a:focus-visible::after { height: 60%; }

/* Highlight the currently-active page in the dropdown */
.submenu .sub-items a.current::before { color: var(--copper); }
.submenu .sub-items a.current .go { opacity: 1; transform: translateX(0); color: var(--copper); }

/* Right-align variant: not needed anymore since the panel is centered,
   but kept for backwards compatibility with existing markup */
.submenu.align-right { left: 48px; right: 48px; }

/* Backwards-compat: legacy footer treatment inside the panel (still supported) */
.submenu .sub-footer { display: none; }

/* ---- Responsive ---- */
@media (max-width: 1100px) {
  .submenu {
    grid-template-columns: 220px 1fr;
    gap: 40px;
    padding: 40px 40px 32px;
  }
  .submenu .sub-title { font-size: 26px; }
}
@media (max-width: 900px) {
  /* Dropdown is hidden on mobile; the mobile nav handles it in the open <ul>. */
  .submenu { display: none; }
}

.build-btn {
  padding: 10px 22px; border: 1px solid var(--silver); color: var(--silver);
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  transition: 0.25s; white-space: nowrap;
  flex-shrink: 0;
}
.build-btn:hover { background: var(--silver); color: var(--bg); }

.mobile-toggle { display: none; }

/* =========================================================
   PAGE HERO (non-home)
   - Sets its background image from CSS variable --hero-img
   - Layered gradient overlay darkens the LEFT side for text legibility,
     lets the RIGHT side of the image breathe
   - Fine copper hairline top + soft radial highlight top-right
========================================================= */
.page-hero {
  padding: 200px 0 120px;
  border-bottom: 1px solid var(--line);
  position: relative; overflow: hidden;
  min-height: 640px;
  isolation: isolate;
  /* Image is applied INLINE via style="background-image: url(...)"
     because relative URLs must resolve against the HTML file, not this stylesheet. */
  background-color: var(--bg-2);
  background-repeat: no-repeat;
  background-position: right center;
  background-size: cover;
}
/* Base filter layer (soft contrast wash on the image) */
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent, rgba(5,5,7,0.15));
  z-index: 0;
  pointer-events: none;
}
/* Gradient overlay — heavy on left, fading right; plus subtle top-and-bottom vignette */
.page-hero::after {
  content: ''; position: absolute; inset: 0;
  background:
    /* Left-to-right darkening for headline legibility */
    linear-gradient(90deg,
      rgba(5,5,7,0.96) 0%,
      rgba(5,5,7,0.9) 25%,
      rgba(5,5,7,0.72) 45%,
      rgba(5,5,7,0.35) 68%,
      rgba(5,5,7,0.15) 88%,
      rgba(5,5,7,0.45) 100%),
    /* Vertical: darker at very top for nav readability + fade to bg at bottom */
    linear-gradient(180deg,
      rgba(5,5,7,0.55) 0%,
      rgba(5,5,7,0.15) 22%,
      rgba(5,5,7,0.05) 55%,
      rgba(5,5,7,0.7) 92%,
      var(--bg) 100%),
    /* Warm top-right accent glow */
    radial-gradient(ellipse 900px 500px at 82% 18%,
      rgba(217,149,101,0.14),
      transparent 60%);
  pointer-events: none;
  z-index: 1;
}
/* Copper hairline along the very top */
.page-hero .container-narrow::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(217,149,101,0.4) 30%, rgba(217,149,101,0.4) 70%, transparent);
  z-index: 3;
}
.page-hero > .container-narrow { position: relative; z-index: 2; }

/* Utility flag for pages that only have a light/subtle image (dawn shots): darken overlay a touch */
.page-hero.dim::after {
  background:
    linear-gradient(90deg,
      rgba(5,5,7,0.98) 0%,
      rgba(5,5,7,0.94) 30%,
      rgba(5,5,7,0.82) 50%,
      rgba(5,5,7,0.5) 72%,
      rgba(5,5,7,0.3) 92%,
      rgba(5,5,7,0.55) 100%),
    linear-gradient(180deg, rgba(5,5,7,0.5) 0%, rgba(5,5,7,0.1) 30%, rgba(5,5,7,0.05) 60%, rgba(5,5,7,0.75) 95%, var(--bg) 100%),
    radial-gradient(ellipse 900px 500px at 82% 18%, rgba(217,149,101,0.1), transparent 60%);
}

.crumbs {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--fg-dim); margin-bottom: 40px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.crumbs a { color: var(--fg-dim); }
.crumbs a:hover { color: var(--fg); }
.crumbs .sep { color: var(--line-2); }
.crumbs .here { color: var(--silver); }

.status-badge {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  padding: 8px 14px; border: 1px solid var(--line-2); background: rgba(217,149,101,0.06);
  color: var(--copper); margin-bottom: 32px;
}
.status-badge .pulse {
  width: 8px; height: 8px; border-radius: 50%; background: var(--copper);
  box-shadow: 0 0 0 0 rgba(217,149,101,0.7);
  animation: pulse 2.4s infinite;
}
.status-badge.future { color: var(--silver); background: rgba(201,204,209,0.04); }
.status-badge.future .pulse { background: var(--silver); box-shadow: none; animation: none; }
.status-badge.long-term { color: var(--fg-dim); background: transparent; }
.status-badge.long-term .pulse { background: var(--fg-dim); animation: none; }

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(217,149,101,0.6); }
  70%  { box-shadow: 0 0 0 12px rgba(217,149,101,0); }
  100% { box-shadow: 0 0 0 0 rgba(217,149,101,0); }
}

.page-hero h1 {
  font-size: clamp(44px, 5.6vw, 84px); line-height: 1.05; letter-spacing: -0.025em; font-weight: 600;
  max-width: 1000px;
}
.page-hero h1 .serif,
.page-hero h1 .accent-silver {
  color: var(--silver); font-weight: 400;
}
.page-hero h1 .copper,
.page-hero h1 .accent-copper { color: var(--copper); font-weight: 500; }

.page-hero .subtitle {
  font-size: clamp(17px, 1.35vw, 20px); line-height: 1.6; color: var(--fg-dim);
  max-width: 700px; margin-top: 36px; font-weight: 400;
}
.page-hero .meta-row {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px;
  margin-top: 72px; padding-top: 32px; border-top: 1px solid var(--line);
}
.page-hero .meta-cell .k {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--fg-dim); margin-bottom: 8px;
}
.page-hero .meta-cell .v { font-size: 20px; letter-spacing: -0.01em; font-weight: 500; }
.page-hero .meta-cell .v small {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; color: var(--fg-dim); margin-left: 6px;
}

/* =========================================================
   SPEC LINE (marquee)
========================================================= */
.specline {
  padding: 24px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--bg-2); overflow: hidden;
}
.specline-track {
  display: flex; gap: 60px; align-items: center;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--fg-dim);
  animation: scroll-l 60s linear infinite; white-space: nowrap; width: max-content;
}
.specline-track .item { display: flex; align-items: center; gap: 12px; }
.specline-track .item strong { color: var(--silver); font-weight: 500; }
.specline-track .item::after { content: '✕'; color: var(--copper); margin-left: 60px; }
@keyframes scroll-l { to { transform: translateX(-50%); } }

/* =========================================================
   CHAPTER LAYOUT
========================================================= */
.chapter { padding: 140px 0; position: relative; }
.chapter.pad-t-sm { padding-top: 80px; }
.chapter.pad-b-sm { padding-bottom: 80px; }
.chapter.tinted { background: var(--bg-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.ch-head {
  display: grid; grid-template-columns: 200px 1fr; gap: 60px; margin-bottom: 80px;
  align-items: end;
}
.ch-head .left { display: flex; flex-direction: column; gap: 6px; padding-top: 8px; }
.ch-head .left .n { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.18em; color: var(--copper); }
.ch-head .left .t { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.16em; color: var(--fg-dim); text-transform: uppercase; }
.ch-head h2 {
  font-size: clamp(40px, 5.5vw, 88px); line-height: 0.95; letter-spacing: -0.03em; font-weight: 600;
  max-width: 1100px;
}
.ch-head h2 .serif { font-family: 'Syne', sans-serif; font-style: normal; font-weight: 400; color: var(--silver); }
.ch-head h2 .copper { color: var(--copper); }
.ch-head .lead {
  font-size: 17px; line-height: 1.6; color: var(--fg-dim); max-width: 640px; margin-top: 24px;
}

.section-eyebrow {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--copper); margin-bottom: 20px; display: inline-block;
}

/* =========================================================
   FEATURE IMAGE
========================================================= */
.img-feature {
  width: 100%; position: relative; overflow: hidden;
  background: var(--bg-3);
  border: 1px solid var(--line);
  aspect-ratio: 21/9;
}
.img-feature img { width: 100%; height: 100%; object-fit: cover; display: block; }
.img-feature.tall { aspect-ratio: 4/3; }
.img-feature.medium { aspect-ratio: 16/9; }
.img-feature .grid-overlay {
  position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(90deg, transparent 0%, rgba(245,245,247,0.03) 1px, transparent 1px);
  background-size: 80px 100%;
}
.img-feature .corner-marks {
  position: absolute; inset: 16px; pointer-events: none;
  background:
    linear-gradient(to right, var(--copper) 12px, transparent 12px) 0 0 / 12px 1px no-repeat,
    linear-gradient(to bottom, var(--copper) 12px, transparent 12px) 0 0 / 1px 12px no-repeat,
    linear-gradient(to left, var(--copper) 12px, transparent 12px) 100% 0 / 12px 1px no-repeat,
    linear-gradient(to bottom, var(--copper) 12px, transparent 12px) 100% 0 / 1px 12px no-repeat,
    linear-gradient(to right, var(--copper) 12px, transparent 12px) 0 100% / 12px 1px no-repeat,
    linear-gradient(to top, var(--copper) 12px, transparent 12px) 0 100% / 1px 12px no-repeat,
    linear-gradient(to left, var(--copper) 12px, transparent 12px) 100% 100% / 12px 1px no-repeat,
    linear-gradient(to top, var(--copper) 12px, transparent 12px) 100% 100% / 1px 12px no-repeat;
}
.img-feature .caption {
  position: absolute; bottom: 20px; left: 24px; right: 24px;
  display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; flex-wrap: wrap;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--fg-dim);
  background: linear-gradient(180deg, transparent, rgba(5,5,7,0.6));
  padding: 40px 0 0;
  margin: 0 -4px;
}
.img-feature .caption strong { color: var(--silver); font-weight: 500; }
.img-feature .caption .concept {
  color: var(--copper); border: 1px solid var(--copper); padding: 4px 10px;
}

/* =========================================================
   3-column technical text grid
========================================================= */
.ch-text-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px;
  margin-top: 72px;
}
.ct { padding-top: 20px; border-top: 1px solid var(--line); }
.ct .label { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.14em; color: var(--copper); margin-bottom: 16px; text-transform: uppercase; }
.ct h4 { font-size: 22px; letter-spacing: -0.01em; font-weight: 500; margin-bottom: 12px; line-height: 1.2; }
.ct p { font-size: 14px; line-height: 1.7; color: var(--fg-dim); }

.ch-text-grid.four { grid-template-columns: repeat(4, 1fr); gap: 32px; }
.ch-text-grid.two { grid-template-columns: repeat(2, 1fr); gap: 60px; }

/* =========================================================
   BIG STATEMENT
========================================================= */
.big-statement {
  padding: 140px 0; text-align: left;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  position: relative;
}
.big-statement h2 {
  font-size: clamp(36px, 4.6vw, 68px); line-height: 1.08; letter-spacing: -0.025em; font-weight: 600;
  max-width: 1200px;
}
.big-statement h2 .serif,
.big-statement h2 .accent-copper { color: var(--copper); font-weight: 500; }
.big-statement h2 .silver,
.big-statement h2 .accent-silver { color: var(--silver); font-weight: 400; }
.big-statement .after { color: var(--fg-dim); font-size: 16px; line-height: 1.7; max-width: 680px; margin-top: 40px; }

/* =========================================================
   DATA TABLE (spec-row)
========================================================= */
.data-table { border-top: 1px solid var(--line); }
.data-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px;
  padding: 18px 0; border-bottom: 1px solid var(--line);
}
.data-row.wide { grid-template-columns: 240px 1fr; }
.data-row .k {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--fg-dim); align-self: center;
}
.data-row .v {
  font-size: 18px; letter-spacing: -0.01em; font-weight: 500;
  font-family: 'Syne';
}
.data-row .v.mono { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 15px; letter-spacing: 0; }
.data-row .v small {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; color: var(--fg-dim); margin-left: 8px; letter-spacing: 0.08em;
}

/* =========================================================
   FLOW DIAGRAM (Question → Theory → Model → Build …)
========================================================= */
.flow {
  display: flex; flex-direction: column; align-items: stretch; gap: 0;
  max-width: 720px; margin: 0 auto;
}
.flow .step {
  display: grid; grid-template-columns: 60px 1fr; gap: 20px; align-items: center;
  padding: 20px 24px; border: 1px solid var(--line);
  background: var(--bg-2);
}
.flow .step + .step { border-top: none; }
.flow .step .num {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.16em; color: var(--copper);
}
.flow .step .word {
  font-size: 18px; letter-spacing: 0; font-weight: 500;
}
.flow .arrow {
  height: 24px; display: flex; justify-content: center; align-items: center;
  color: var(--fg-dimmer);
}
.flow .arrow::before {
  content: ''; width: 1px; height: 100%; background: linear-gradient(180deg, var(--line-2), var(--copper));
}

/* Horizontal flow (compact) */
.flow-h {
  display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: 0;
  align-items: stretch; overflow-x: auto;
}
.flow-h > .step {
  padding: 24px; border: 1px solid var(--line); background: var(--bg-2); position: relative;
  min-width: 180px;
}
.flow-h > .step + .step { border-left: none; }
.flow-h > .step .num { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.18em; color: var(--copper); margin-bottom: 10px; }
.flow-h > .step .word { font-size: 15px; font-weight: 500; letter-spacing: 0; }
.flow-h > .step .sub { font-size: 12px; color: var(--fg-dim); margin-top: 8px; line-height: 1.5; font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; }
.flow-h > .step:not(:last-child)::after {
  content: '→'; position: absolute; right: -8px; top: 50%; transform: translateY(-50%);
  color: var(--copper); font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 14px;
  background: var(--bg); padding: 0 2px; z-index: 2;
}

/* =========================================================
   KYTE-GEN CARDS  (X1..X4)
========================================================= */
.kite-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.kite-card {
  background: var(--bg-2); border: 1px solid var(--line); padding: 32px; position: relative;
  display: flex; flex-direction: column; min-height: 340px;
  transition: 0.3s;
}
.kite-card:hover { border-color: var(--copper); transform: translateY(-2px); }
.kite-card .gen {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.2em; color: var(--fg-dim); margin-bottom: 20px;
  text-transform: uppercase;
}
.kite-card h3 {
  font-size: 34px; letter-spacing: -0.025em; font-weight: 600; margin-bottom: 12px;
  text-transform: none;
}
.kite-card .verb {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 12px; letter-spacing: 0.2em; color: var(--copper);
  text-transform: uppercase; margin-bottom: 20px;
}
.kite-card .desc { font-size: 14px; color: var(--fg-dim); line-height: 1.6; flex: 1; }
.kite-card .link {
  margin-top: 24px; font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.16em;
  color: var(--silver); text-transform: uppercase;
  display: inline-flex; align-items: center; gap: 8px;
}
.kite-card .link::after { content: '→'; transition: 0.2s; }
.kite-card:hover .link::after { transform: translateX(4px); color: var(--copper); }
.kite-card.current { border-color: var(--copper); background: linear-gradient(180deg, rgba(217,149,101,0.08), var(--bg-2) 40%); }
.kite-card.current::before {
  content: 'CURRENT'; position: absolute; top: 20px; right: 20px;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 9px; letter-spacing: 0.2em; color: var(--copper);
  padding: 4px 8px; border: 1px solid var(--copper);
}

/* =========================================================
   EQUATIONS
========================================================= */
.eq-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0;
  border: 1px solid var(--line);
}
.eq {
  padding: 32px 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line);
  text-align: center;
}
.eq:last-child { border-right: none; }
.eq .label {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.18em; color: var(--fg-dim);
  text-transform: uppercase; margin-bottom: 16px;
}
.eq .formula {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-style: normal; font-weight: 400;
  font-size: 22px; color: var(--silver); letter-spacing: -0.01em;
}
.eq .formula .op { color: var(--fg-dim); margin: 0 6px; }
.eq .desc { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; color: var(--fg-dim); margin-top: 12px; letter-spacing: 0.06em; }

/* =========================================================
   CTA (big button)
========================================================= */
.btn-primary, .btn-ghost {
  display: inline-flex; align-items: center; gap: 14px;
  padding: 16px 28px;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase; font-weight: 500;
  transition: 0.25s; border: 1px solid;
}
.btn-primary { background: var(--silver); color: var(--bg); border-color: var(--silver); }
.btn-primary:hover { background: var(--copper); border-color: var(--copper); color: var(--fg); }
.btn-ghost { background: transparent; color: var(--silver); border-color: var(--line-2); }
.btn-ghost:hover { border-color: var(--silver); color: var(--fg); }

/* =========================================================
   BLOCK QUOTE
========================================================= */
.pull-quote {
  font-family: 'Syne', sans-serif; font-style: normal; font-weight: 400;
  font-size: clamp(22px, 2.4vw, 34px); line-height: 1.45; letter-spacing: -0.015em;
  color: var(--fg); max-width: 1000px; margin: 40px 0;
  padding-left: 24px; border-left: 2px solid var(--copper);
}
.pull-quote em { font-style: normal; color: var(--silver); font-weight: 400; }

/* =========================================================
   TIMELINE (vertical, engineering-notebook style)
========================================================= */
.timeline { position: relative; padding-left: 60px; }
.timeline::before {
  content: ''; position: absolute; left: 20px; top: 20px; bottom: 20px;
  width: 1px; background: linear-gradient(180deg, var(--line), var(--copper), var(--line));
}
.timeline .node {
  position: relative; padding: 20px 0 60px;
}
.timeline .node::before {
  content: ''; position: absolute; left: -47px; top: 26px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--bg); border: 1.5px solid var(--copper);
}
.timeline .node .label {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--copper); margin-bottom: 12px;
}
.timeline .node h4 {
  font-size: 24px; letter-spacing: -0.015em; font-weight: 500; margin-bottom: 12px;
  text-transform: none;
}
.timeline .node p { color: var(--fg-dim); line-height: 1.65; font-size: 15px; max-width: 640px; }

/* =========================================================
   EXPERIMENT CARDS  (research page)
========================================================= */
.experiment {
  border: 1px solid var(--line); background: var(--bg-2);
  padding: 40px; margin-bottom: 24px;
  display: grid; grid-template-columns: 200px 1fr; gap: 40px;
}
.experiment .side { border-right: 1px solid var(--line); padding-right: 30px; }
.experiment .side .id {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 13px; letter-spacing: 0.12em; color: var(--copper);
  margin-bottom: 12px;
}
.experiment .side .date { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; color: var(--fg-dim); letter-spacing: 0.1em; }
.experiment .side .aircraft { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; color: var(--silver); margin-top: 20px; letter-spacing: 0.1em; }
.experiment .side .stage {
  margin-top: 20px; display: inline-block; font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px;
  padding: 4px 8px; border: 1px solid var(--line-2); color: var(--fg-dim); letter-spacing: 0.16em;
  text-transform: uppercase;
}
.experiment .side .stage.active { color: var(--copper); border-color: var(--copper); }
.experiment .main h3 { font-size: 22px; font-weight: 500; margin-bottom: 12px; letter-spacing: -0.01em; line-height: 1.4; text-transform: none; }
.experiment .main .hypothesis {
  font-family: 'Syne', sans-serif; font-style: normal; font-weight: 400;
  font-size: 16px; color: var(--silver); margin: 16px 0; line-height: 1.6;
  padding-left: 16px; border-left: 2px solid var(--line-2);
}
.experiment .main .fields {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px 40px; margin-top: 24px;
}
.experiment .main .field .k {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.18em; color: var(--fg-dim);
  text-transform: uppercase; margin-bottom: 6px;
}
.experiment .main .field .v { font-size: 14px; color: var(--fg); line-height: 1.5; }
.experiment .main .field .v.mono { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 13px; }

/* =========================================================
   FOOTER
========================================================= */
footer {
  padding: 80px 0 32px;
  border-top: 1px solid var(--line);
  background: var(--bg-2);
}
.ft-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr; gap: 60px; margin-bottom: 60px;
}
.ft-grid h5 {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--fg-dim); margin-bottom: 18px; font-weight: 500;
}
.ft-grid li { list-style: none; padding: 5px 0; font-size: 14px; }
.ft-grid li a { color: var(--fg); transition: 0.2s; }
.ft-grid li a:hover { color: var(--copper); }
.ft-brand-blurb { color: var(--fg-dim); font-size: 14px; max-width: 340px; line-height: 1.7; margin-top: 20px; }
.ft-blurb-tag {
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.2em; color: var(--copper);
  margin-top: 20px; text-transform: uppercase; display: block;
}
.ft-bot {
  display: flex; justify-content: space-between; align-items: center; padding-top: 28px;
  border-top: 1px solid var(--line);
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.14em; color: var(--fg-dim);
  gap: 20px; flex-wrap: wrap;
}
.ft-disclaimer {
  padding: 20px; margin: 32px 0; border: 1px solid var(--line);
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 11px; letter-spacing: 0.06em;
  color: var(--fg-dim); line-height: 1.7;
}
.ft-disclaimer strong { color: var(--copper); font-weight: 500; letter-spacing: 0.16em; }

/* =========================================================
   Small utilities
========================================================= */
.tag {
  display: inline-block; padding: 4px 10px;
  font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--copper); border: 1px solid var(--copper);
}
.tag.silver { color: var(--silver); border-color: var(--silver); }
.tag.dim { color: var(--fg-dim); border-color: var(--line-2); }

.hairline { border-top: 1px solid var(--line); }

.sup { font-family: 'Syne', sans-serif; font-variant-caps: all-small-caps; text-transform: lowercase; font-feature-settings: "smcp"; font-size: 0.6em; letter-spacing: 0.1em; color: var(--copper); vertical-align: super; margin-left: 6px; }

/* =========================================================
   RESPONSIVE
========================================================= */
@media (max-width: 1100px) {
  .kite-grid { grid-template-columns: repeat(2, 1fr); }
  .ch-text-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .ch-text-grid.four { grid-template-columns: repeat(2, 1fr); }
  .ft-grid { grid-template-columns: 1.6fr 1fr 1fr; gap: 40px; }
}
@media (max-width: 900px) {
  nav.top ul { display: none; }
  nav.top ul.open {
    display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--bg-2); border-top: 1px solid var(--line); padding: 24px 32px; gap: 20px;
    max-height: 80vh; overflow-y: auto;
  }
  .mobile-toggle {
    display: flex; flex-direction: column; gap: 4px; background: none; border: none;
    padding: 8px; cursor: pointer;
  }
  .mobile-toggle span {
    display: block; width: 22px; height: 1.5px; background: var(--silver);
  }
  .build-btn { display: none; }
  .container, .container-narrow { padding: 0 24px; }
  .ch-head { grid-template-columns: 1fr; gap: 20px; margin-bottom: 50px; }
  .experiment { grid-template-columns: 1fr; gap: 24px; padding: 28px; }
  .experiment .side { border-right: none; border-bottom: 1px solid var(--line); padding: 0 0 20px; }
  .experiment .main .fields { grid-template-columns: 1fr; gap: 16px; }
  .page-hero { padding: 130px 0 70px; }
  .page-hero .meta-row { grid-template-columns: repeat(2, 1fr); gap: 30px; }
}
@media (max-width: 640px) {
  .kite-grid { grid-template-columns: 1fr; }
  .ch-text-grid, .ch-text-grid.two, .ch-text-grid.four { grid-template-columns: 1fr; gap: 30px; }
  .ft-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .ft-grid > div:first-child { grid-column: 1 / -1; }
  .ft-bot { flex-direction: column; text-align: center; }
  .data-row { grid-template-columns: 1fr; gap: 4px; padding: 14px 0; }
  .data-row .k { font-size: 10px; }
  .chapter { padding: 80px 0; }
  .big-statement { padding: 80px 0; }
  .flow-h { grid-auto-flow: row; }
  .flow-h > .step { border: 1px solid var(--line); }
  .flow-h > .step + .step { border-top: none; }
  .flow-h > .step:not(:last-child)::after { content: '↓'; right: auto; left: 50%; top: auto; bottom: -8px; transform: translateX(-50%); }
  .timeline { padding-left: 40px; }
  .timeline .node::before { left: -32px; }
  .brand-sub { display: none !important; }
}


/* ============================================================
   SMALL-CAPS UNIFICATION
   All technical labels, mono text, eyebrows, buttons, chapter tags,
   footer links, data-row keys, etc. render as synthesized small
   caps in Syne. Everything else (headings, body copy) stays natural.
   ============================================================ */
.mono,
.smallcaps,
nav.top ul,
.build-btn,
.stat-cell .label,
.stat-cell .ann,
.stat-cell .val .unit,
.hero-home .eyebrow,
.specline-track,
.crumbs,
.status-badge,
.section-eyebrow,
.tag,
.ch-head .left .n,
.ch-head .left .t,
.meta-cell .k,
.meta-cell .v small,
.data-row .k,
.data-row .v small,
.data-row .v.mono,
.eq .label,
.eq .formula,
.eq .desc,
.btn-primary,
.btn-ghost,
.timeline .node .label,
.experiment .side .id,
.experiment .side .date,
.experiment .side .aircraft,
.experiment .side .stage,
.experiment .main .field .k,
.experiment .main .field .v.mono,
.family-card .status,
.family-card .link,
.kite-card .gen,
.kite-card .verb,
.kite-card.current::before,
.kite-card .link,
.flow .step .num,
.flow-h > .step .num,
.flow-h > .step .sub,
.img-feature .caption,
.img-feature .caption strong,
.ft-grid h5,
.ft-blurb-tag,
.ft-bot,
.ft-disclaimer,
.submenu .sub-eyebrow,
.submenu .sub-cta,
.submenu .sub-items a small,
.submenu .sub-items a .go,
.submenu .sub-items a::before,
.aat-flow .step,
.aat-flow .step .n,
.aat-flow .step .w,
.exp-header .filter span,
.entry .meta .wk,
.entry .meta .tags span,
.entry .body h5,
.contact-card .k,
.contact-card .cta,
.cf label,
.cf .submit,
.rm-year .rm-side .grade,
.rm-year .rm-side .aircraft,
.rm-year .rm-side .status,
.rm-year .rm-cols .k,
.powertrain .stage .k {
  font-family: 'Syne', sans-serif !important;
  font-variant-caps: all-small-caps !important;
  font-feature-settings: "smcp" 1, "c2sc" 1 !important;
  text-transform: lowercase !important;
}

/* Headings and body copy are NOT small-caps — leave them natural */
h1, h2, h3, h4, h5:not(.ft-grid h5), h6,
p:not(.subtitle):not(.after):not(.quote):not(.ft-brand-blurb),
.pull-quote,
.brand,
.sub-title,
.sub-lede {
  font-variant-caps: normal !important;
  text-transform: none !important;
  font-feature-settings: normal !important;
}
/* Exception: the home hero headline is set in full CAPS */
.hero-home h1 { text-transform: uppercase !important; }

/* Special: the equation formulas — keep them as-is (they use sub/sup + Syne),
   but drop small-caps because equations must render as actual chars, not sc */
.eq .formula, .eqline {
  font-variant-caps: normal !important;
  text-transform: none !important;
}


/* ============================================================
   TYPOGRAPHIC SCALE — STANDARDIZED
   Base 16px. Modular scale (~1.25 major-third).
   Consolidates the size sprawl into 8 tiers.

     --fs-xs   : 12px  small labels, badges, tags
     --fs-sm   : 14px  captions, nav links, buttons, footer li, small body
     --fs-base : 16px  body paragraphs
     --fs-md   : 18px  lead / subtitle / data values
     --fs-lg   : 22px  small headings, kite verb, section labels
     --fs-xl   : 28px  h4 / card titles
     --fs-2xl  : 36px  h3 / big stat values
     --fs-3xl  : clamp(40,4.4vw,56)  h2 / section headings
     --fs-4xl  : clamp(48,5.6vw,80)  h1 hero
   ============================================================ */
:root {
  --fs-xs:   12px;
  --fs-sm:   14px;
  --fs-base: 16px;
  --fs-md:   18px;
  --fs-lg:   22px;
  --fs-xl:   28px;
  --fs-2xl:  36px;
  --fs-3xl:  clamp(40px, 4.4vw, 56px);
  --fs-4xl:  clamp(48px, 5.6vw, 80px);
  --ls-mono: 0.14em;
  --ls-mono-tight: 0.1em;
}

/* -- Headings unified -- */
.page-hero h1,
.hero-home h1,
.about-h,
h1 { font-size: var(--fs-4xl) !important; line-height: 1.05 !important; letter-spacing: -0.025em; font-weight: 400 !important; }
/* Accent spans inside hero h1 stay at same weight — differentiation via color only */
.page-hero h1 .accent-silver,
.hero-home h1 .accent-silver,
.about-h .accent-silver,
h1 .accent-silver { font-weight: 400 !important; color: var(--silver); }
.page-hero h1 .accent-copper,
.hero-home h1 .accent-copper,
.about-h .accent-copper,
h1 .accent-copper { font-weight: 400 !important; color: var(--copper); }
.hero-home h1 .qmark { font-weight: 400 !important; color: var(--copper); }

.ch-head h2,
.big-statement h2,
.energy-h,
.closer h2,
h2 { font-size: var(--fs-3xl) !important; line-height: 1.1 !important; letter-spacing: -0.022em; font-weight: 600; }

.kite-card h3,
.rm-year .rm-main h3,
.experiment .main h3,
.entry .meta h4,
.contact-card h3,
h3 { font-size: var(--fs-2xl) !important; line-height: 1.15 !important; letter-spacing: -0.02em; font-weight: 600; }

.family-card h4,
.timeline .node h4,
h4 { font-size: var(--fs-xl) !important; line-height: 1.2 !important; letter-spacing: -0.015em; font-weight: 600; }

/* Stat values — same tier as h3 */
.stat-cell .val,
.hero-bottom .stat-cell .val { font-size: var(--fs-2xl) !important; line-height: 1.1 !important; font-weight: 500; letter-spacing: -0.02em; }
.stat-cell .val .unit { font-size: var(--fs-xs) !important; letter-spacing: var(--ls-mono); }

/* Meta cells in page-hero — data-tier: 22px */
.page-hero .meta-cell .v { font-size: var(--fs-lg) !important; line-height: 1.2 !important; font-weight: 500; }
.page-hero .meta-cell .v small { font-size: var(--fs-xs) !important; }

/* Data table values (spec-row) */
.data-row .v { font-size: var(--fs-md) !important; line-height: 1.4 !important; font-weight: 500; }
.data-row .v small,
.data-row .v.mono { font-size: var(--fs-sm) !important; letter-spacing: var(--ls-mono-tight); }

/* Equations */
.eq .formula { font-size: var(--fs-lg) !important; line-height: 1.3 !important; letter-spacing: -0.005em; }

/* Body paragraphs */
p,
.hero-home .support,
.page-hero .subtitle,
.subtitle,
.big-statement .after,
.chapter p:not(.pull-quote),
.family-card p,
.kite-card .desc,
.rm-year .rm-main .rm-question,
.experiment .main .hypothesis,
.entry .body p,
.entry .body li,
.contact-card p,
.timeline .node p,
.ct p {
  font-size: var(--fs-base) !important;
  line-height: 1.7 !important;
  letter-spacing: 0;
}

/* Subtitle / lead paragraphs — slightly larger */
.page-hero .subtitle,
.hero-home .support,
.hero-home .content .support,
.subtitle {
  font-size: var(--fs-md) !important;
  line-height: 1.6 !important;
  color: var(--fg-dim);
}

/* Pull quote — one tier up from lead */
.pull-quote { font-size: var(--fs-lg) !important; line-height: 1.5 !important; }

/* Small captions / secondary body */
.kite-card .desc,
.family-card p,
.ct p,
.ft-brand-blurb,
.ft-disclaimer,
.exp-header,
.contact-card p { font-size: var(--fs-sm) !important; line-height: 1.65 !important; }

/* -- Labels / mono tier: 12px -- */
.mono,
.stat-cell .label,
.stat-cell .ann,
.hero-home .eyebrow,
.specline-track,
.crumbs,
.status-badge,
.section-eyebrow,
.tag,
.ch-head .left .n,
.ch-head .left .t,
.meta-cell .k,
.eq .label,
.eq .desc,
.timeline .node .label,
.experiment .side .date,
.experiment .side .aircraft,
.experiment .side .stage,
.experiment .main .field .k,
.family-card .status,
.family-card .link,
.kite-card .gen,
.kite-card .verb,
.kite-card .link,
.flow .step .num,
.flow-h > .step .num,
.flow-h > .step .sub,
.img-feature .caption,
.img-feature .caption strong,
.ft-grid h5,
.ft-blurb-tag,
.ft-bot,
.submenu .sub-eyebrow,
.submenu .sub-cta,
.submenu .sub-items a small,
.submenu .sub-items a .go,
.aat-flow .step .n,
.aat-flow .step .w,
.exp-header .filter span,
.entry .meta .wk,
.entry .meta .tags span,
.entry .body h5,
.contact-card .k,
.contact-card .cta,
.cf label,
.rm-year .rm-side .grade,
.rm-year .rm-side .aircraft,
.rm-year .rm-side .status,
.rm-year .rm-cols .k,
.powertrain .stage .k,
.data-row .k {
  font-size: var(--fs-xs) !important;
  letter-spacing: var(--ls-mono) !important;
  line-height: 1.4 !important;
}

/* Slightly larger mono for prominent labels */
.experiment .side .id,
.btn-primary,
.btn-ghost,
.build-btn,
nav.top ul a,
.brand,
.ft-grid li a,
.ft-grid li,
.submenu .sub-items a,
.hero-bottom .stat-cell.ctas a {
  font-size: var(--fs-sm) !important;
}

/* -- Kyte card verb: bigger presence -- */
.kite-card .verb { font-size: var(--fs-sm) !important; letter-spacing: 0.18em !important; }

/* -- Nav brand: matches heading style, not label -- */
.brand { font-size: 15px !important; letter-spacing: 0.02em !important; font-weight: 600; text-transform: none; font-variant-caps: normal !important; }
.brand .brand-sub { font-size: 10px !important; letter-spacing: 0.16em !important; }
.brand .mark { font-size: 16px !important; }

/* -- Hero eyebrow is a pill of technical info -- */
.hero-home .eyebrow { font-size: var(--fs-xs) !important; letter-spacing: 0.18em !important; }

/* -- Kyte card index number (gen) — kept small -- */
.kite-card .gen { font-size: 11px !important; letter-spacing: 0.18em !important; }

/* -- Navbar + dropdown: sizes bumped 10% for readability -- */
nav.top ul a           { font-size: 15px !important; }
.build-btn             { font-size: 15px !important; }
.brand                 { font-size: 16px !important; }
.brand .brand-sub      { font-size: 11px !important; }
.brand .mark           { font-size: 18px !important; }

.submenu .sub-title    { font-size: 30px !important; line-height: 1.15 !important; font-weight: 500 !important; }
.submenu .sub-lede     { font-size: 16px !important; line-height: 1.55 !important; }
.submenu .sub-eyebrow  { font-size: 13px !important; }
.submenu .sub-cta      { font-size: 13px !important; }
.submenu .sub-items a  { font-size: 20px !important; letter-spacing: -0.005em !important; line-height: 1.35 !important; }
.submenu .sub-items a small { font-size: 13px !important; letter-spacing: 0.14em !important; line-height: 1.3 !important; }
.submenu .sub-items a::before { font-size: 13px !important; }
.submenu .sub-items a .go     { font-size: 18px !important; }

/* Chapter label ("Chapter 01") + subtitle ("— First principles") */
.ch-head .left .n,
.ch-head .left .t {
  font-size: 14px !important;
  letter-spacing: 0.18em !important;
  line-height: 1.3 !important;
}

/* Big stat val on home hero specifically — bigger for weight */
.hero-home .stat-cell .val { font-size: var(--fs-xl) !important; }
.hero-home .stat-cell .val[style*="font-size"] { font-size: var(--fs-md) !important; }

/* -- MOBILE ADJUSTMENTS -- */
@media (max-width: 640px) {
  :root {
    --fs-xs:   11px;
    --fs-sm:   13px;
    --fs-base: 15px;
    --fs-md:   16px;
    --fs-lg:   19px;
    --fs-xl:   24px;
    --fs-2xl:  30px;
  }
}