/* ─────────────────────────────────────────────────────────────
   Babu Lab — styles
   One accent ("signal"), black canvas, one light section for rhythm.
   Type: the platform's system face first (SF Pro on Apple devices),
   Inter elsewhere. Tracking tightens as size grows.
   ───────────────────────────────────────────────────────────── */

:root {
  --bg: #000;
  --bg-raise: #0b0b0d;
  --fg: #f5f5f7;
  --muted: #86868b;
  --dim: #6e6e73;
  --hair: rgba(255, 255, 255, 0.09);
  --hair-strong: rgba(255, 255, 255, 0.16);

  --accent: #ff6b2c;
  --accent-2: #ff3d5a;
  --accent-soft: rgba(255, 107, 44, 0.14);

  --light-bg: #f5f5f7;
  --light-fg: #1d1d1f;
  --light-muted: #6e6e73;

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;

  --gutter: clamp(20px, 5vw, 48px);
  --max: 1200px;
  --radius-l: 28px;
  --radius-m: 18px;

  /* Critically-damped feel for CSS-driven reveals (no overshoot) */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 17px/1.47 var(--font);
  letter-spacing: -0.012em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, canvas { display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
::selection { background: var(--accent); color: #000; }

/* Film grain over the whole page: keeps large black fields from feeling flat */
body::after {
  content: "";
  position: fixed;
  inset: -50%;
  z-index: 100;
  pointer-events: none;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.sr-only, .hp {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip {
  position: absolute; left: 12px; top: -60px; z-index: 200;
  padding: 10px 16px; border-radius: 999px; background: var(--fg); color: #000;
}
.skip:focus { top: 12px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.container { width: 100%; max-width: calc(var(--max) + var(--gutter) * 2); margin: 0 auto; padding: 0 var(--gutter); }
.muted { color: var(--muted); }

/* ─── Type ─── */
.eyebrow {
  margin: 0 0 18px;
  font: 500 12px/1.2 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.eyebrow-dot::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px; margin: 0 10px 1px 0;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
  vertical-align: middle;
}
.section-title {
  margin: 0;
  font-size: clamp(40px, 6.4vw, 80px);
  line-height: 1.02;
  font-weight: 600;
  letter-spacing: -0.035em;
}
.lead {
  font-size: clamp(19px, 1.7vw, 22px);
  line-height: 1.45;
  letter-spacing: -0.016em;
  color: var(--muted);
  max-width: 34em;
}
.lead strong { color: var(--fg); font-weight: 600; }
.grad {
  background: linear-gradient(92deg, var(--accent) 10%, var(--accent-2) 90%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  padding-bottom: 0.08em; /* keep descenders inside the clipped box */
}

/* ─── Buttons ─── */
.btn {
  position: relative;
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 0 26px;
  border: 0; border-radius: 999px;
  background: var(--fg); color: #000;
  font-size: 17px; font-weight: 500; letter-spacing: -0.01em;
  cursor: pointer;
  transition: transform 100ms ease-out, background-color 200ms ease, box-shadow 300ms ease;
  -webkit-tap-highlight-color: transparent;
}
.btn:hover { background: #fff; box-shadow: 0 0 0 6px rgba(255, 255, 255, 0.08); }
/* Feedback lives on the press, not the release */
.btn:active, .btn.is-pressed { transform: scale(0.97); }
.btn-small { min-height: 34px; padding: 0 16px; font-size: 14px; }
.link-arrow {
  display: inline-flex; align-items: center; gap: 6px;
  min-height: 48px; padding: 0 6px;
  color: var(--fg); font-size: 17px; font-weight: 500;
  transition: color 200ms ease;
}
.link-arrow::after {
  content: ""; width: 7px; height: 7px;
  border-right: 1.6px solid currentColor; border-top: 1.6px solid currentColor;
  transform: rotate(45deg); margin-left: 2px;
  transition: transform 300ms var(--ease-out);
}
.link-arrow:hover { color: var(--accent); }
.link-arrow:hover::after { transform: translateX(3px) rotate(45deg); }

/* ─── Nav: a translucent material that thickens as content scrolls under it ─── */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  height: 56px;
  --m: 0; /* 0 → 1, set from scroll */
  background: rgba(0, 0, 0, calc(var(--m) * 0.62));
  -webkit-backdrop-filter: saturate(180%) blur(calc(var(--m) * 20px));
  backdrop-filter: saturate(180%) blur(calc(var(--m) * 20px));
}
.nav::after { /* scroll-edge hairline, only once content is underneath */
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: rgba(255, 255, 255, calc(var(--m) * 0.08));
}
.nav-inner {
  height: 100%; max-width: calc(var(--max) + var(--gutter) * 2);
  margin: 0 auto; padding: 0 var(--gutter);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; font-size: 17px; letter-spacing: -0.02em; }
.brand-mark { width: 24px; height: 24px; color: var(--fg); }
.nav-links { display: flex; gap: 32px; font-size: 13px; color: rgba(245, 245, 247, 0.8); }
.nav-links a { transition: color 200ms ease; }
.nav-links a:hover { color: #fff; }

/* ─── Materialize: blur + rise + fade together, so text arrives as a surface ─── */
.materialize {
  opacity: 0;
  filter: blur(14px);
  transform: translate3d(0, 24px, 0);
  transition:
    opacity 1.1s var(--ease-out) calc(var(--d, 0) * 110ms + 150ms),
    filter 1.1s var(--ease-out) calc(var(--d, 0) * 110ms + 150ms),
    transform 1.3s var(--ease-out) calc(var(--d, 0) * 110ms + 150ms);
}
.is-ready .materialize { opacity: 1; filter: blur(0); transform: none; }

.reveal {
  opacity: 0;
  filter: blur(10px);
  transform: translate3d(0, 40px, 0);
  transition: opacity 1s var(--ease-out), filter 1s var(--ease-out), transform 1.2s var(--ease-out);
  transition-delay: var(--rd, 0ms);
}
.reveal.in { opacity: 1; filter: blur(0); transform: none; }

/* ─── Hero ─── */
.hero {
  position: relative;
  min-height: 100vh; min-height: 100svh;
  display: grid; place-items: center;
  overflow: hidden;
  isolation: isolate;
}
.hero-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%; z-index: -2;
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 9%, #000 91%, transparent 100%), linear-gradient(180deg, #000 70%, transparent 100%);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(90deg, transparent 0, #000 9%, #000 91%, transparent 100%), linear-gradient(180deg, #000 70%, transparent 100%);
  mask-composite: intersect;
}
.hero-scrim {
  position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(ellipse 52% 46% at 50% 50%, rgba(0, 0, 0, 0.82) 0%, rgba(0, 0, 0, 0.55) 45%, rgba(0, 0, 0, 0) 100%);
}
.hero-content {
  position: relative;
  max-width: 1040px; padding: 120px var(--gutter) 140px;
  text-align: center;
  will-change: transform, opacity;
}
.hero-title {
  margin: 0;
  font-size: clamp(46px, 9.2vw, 128px);
  line-height: 1.0;
  font-weight: 600;
  letter-spacing: -0.045em;
}
.hero-title span { display: block; }
.hero-sub {
  margin: 28px auto 0;
  max-width: 35em;
  font-size: clamp(18px, 1.75vw, 23px);
  line-height: 1.42;
  color: rgba(245, 245, 247, 0.72);
  letter-spacing: -0.016em;
}
.hero-cta { margin-top: 40px; display: flex; gap: 18px; justify-content: center; align-items: center; flex-wrap: wrap; }
.hero-legend {
  position: absolute; left: 50%; bottom: 28px; transform: translateX(-50%);
  margin: 0; width: max-content; max-width: calc(100% - 40px);
  font: 400 11px/1.4 var(--mono); letter-spacing: 0.04em;
  color: var(--dim); text-align: center;
}
.is-ready .hero-legend.materialize { transform: translateX(-50%); }
.hero-legend .dot {
  display: inline-block; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); margin-right: 8px; vertical-align: 1px;
  animation: blink 2.4s ease-in-out infinite;
}
@keyframes blink { 50% { opacity: 0.25; } }

/* ─── Manifesto ─── */
.manifesto { position: relative; height: 260vh; }
.manifesto-sticky {
  position: sticky; top: 0;
  height: 100vh; height: 100svh;
  display: grid; place-items: center;
  padding: 0 var(--gutter);
}
.manifesto-text {
  margin: 0; max-width: 1080px;
  font-size: clamp(32px, 4.8vw, 66px);
  line-height: 1.12;
  font-weight: 600;
  letter-spacing: -0.032em;
}
.manifesto-text .w { opacity: 0.16; transition: opacity 120ms linear; }
.manifesto-text em { font-style: normal; }
.manifesto-text em .w { color: var(--accent); }

/* ─── Claims ─── */
.claims { padding: 8vh 0 18vh; }
.claim {
  display: grid; grid-template-columns: 1.15fr 1fr; gap: 40px; align-items: end;
  padding: 56px 0;
  border-top: 1px solid var(--hair);
}
.claim:last-child { border-bottom: 1px solid var(--hair); }
.claim h2 {
  margin: 0;
  font-size: clamp(40px, 6vw, 84px);
  line-height: 1.0; font-weight: 600; letter-spacing: -0.04em;
}
.claim p { margin: 0; max-width: 28em; font-size: clamp(17px, 1.5vw, 21px); line-height: 1.45; color: var(--muted); }

/* ─── Engine ─── */
.engine { position: relative; height: 440vh; }
.engine-sticky {
  position: sticky; top: 0;
  height: 100vh; height: 100svh;
  max-width: calc(var(--max) + var(--gutter) * 2); margin: 0 auto; padding: 72px var(--gutter) 40px;
  display: grid; grid-template-columns: minmax(320px, 0.9fr) 1.25fr; gap: 48px; align-items: center;
}
.engine-copy { position: relative; }
.engine-copy .section-title { font-size: clamp(40px, 5.2vw, 72px); margin-bottom: 40px; }
.steps-wrap { position: relative; }
.steps { list-style: none; margin: 0; padding: 0 0 0 28px; display: grid; gap: 22px; }
.step { opacity: 0.28; transition: opacity 500ms var(--ease-out); }
.step.is-active { opacity: 1; }
.step-index { font: 500 12px/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.step.is-active .step-index { color: var(--accent); }
.step h3 { margin: 8px 0 0; font-size: 24px; line-height: 1.15; font-weight: 600; letter-spacing: -0.022em; }
.step p {
  margin: 0; max-width: 30em; font-size: 16px; line-height: 1.5; color: var(--muted);
  display: grid; grid-template-rows: 0fr; overflow: hidden;
  opacity: 0;
  transition: grid-template-rows 600ms var(--ease-out), opacity 500ms var(--ease-out), margin 600ms var(--ease-out);
}
.step.is-active p { grid-template-rows: 1fr; opacity: 1; margin-top: 10px; }
.step p > span { min-height: 0; overflow: hidden; } /* lets the 0fr row collapse to nothing */
.rail-progress {
  position: absolute; left: 0; top: 0; bottom: 0; width: 2px;
  background: var(--hair); border-radius: 2px; overflow: hidden;
}
.rail-progress span {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  transform-origin: top; transform: scaleY(0);
}
.engine-visual { position: relative; height: min(76vh, 680px); }
.engine-visual canvas { width: 100%; height: 100%; }
.engine-caption {
  position: absolute; left: 0; right: 0; bottom: 6px; margin: 0; text-align: center;
  font: 500 11px/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim);
}

/* ─── Research rail ─── */
.research { padding: 18vh 0 16vh; }
.research-head { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: end; margin-bottom: 56px; }
.research-intro { margin: 0; justify-self: end; max-width: 26em; font-size: clamp(17px, 1.5vw, 21px); line-height: 1.45; color: var(--muted); }

.rail {
  position: relative;
  overflow: hidden;
  touch-action: pan-y; /* vertical page scroll stays native; horizontal is ours */
  cursor: grab;
  outline: none;
  user-select: none; -webkit-user-select: none;
}
.rail.is-dragging { cursor: grabbing; }
.rail-track {
  display: flex; gap: 20px;
  padding: 0 max(var(--gutter), calc((100vw - var(--max)) / 2));
  width: max-content;
  will-change: transform;
}
.card {
  position: relative;
  flex: 0 0 auto;
  width: min(384px, 80vw);
  height: 560px;
  padding: 32px 32px 0;
  border-radius: var(--radius-l);
  background:
    radial-gradient(120% 70% at 50% 120%, rgba(255, 107, 44, 0.10), transparent 60%),
    linear-gradient(180deg, #121214, #0a0a0b);
  border: 1px solid var(--hair);
  display: flex; flex-direction: column;
  overflow: hidden;
  transition: border-color 300ms ease;
}
.card::before { /* light catching the top edge */
  content: ""; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.22), transparent);
}
.card:hover { border-color: var(--hair-strong); }
.card-index { font: 500 12px/1 var(--mono); letter-spacing: 0.06em; color: var(--accent); }
.card h3 { margin: 18px 0 12px; font-size: 28px; line-height: 1.1; font-weight: 600; letter-spacing: -0.028em; }
.card p { margin: 0; font-size: 16px; line-height: 1.5; color: var(--muted); }
.card-art { margin-top: auto; width: calc(100% + 64px); margin-left: -32px; padding: 0 20px 26px; height: auto; overflow: visible; }

/* Card art — drawn, not pictured */
.card-art .faint { fill: none; stroke: rgba(255, 255, 255, 0.12); stroke-width: 1; }
.card-art .faint-stroke { fill: none; stroke: rgba(255, 255, 255, 0.12); stroke-width: 1; }
.card-art .draw {
  fill: none; stroke: rgba(245, 245, 247, 0.75); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
  stroke-dasharray: var(--len, 600); stroke-dashoffset: var(--len, 600);
  transition: stroke-dashoffset 1.8s var(--ease-out) var(--dl, 0s);
}
.card-art .draw.thin { stroke-width: 1.2; stroke: rgba(245, 245, 247, 0.35); }
.card-art .draw.accent { stroke: var(--accent); }
.card-art .draw.dash { stroke-dasharray: 4 6; stroke-dashoffset: 0; opacity: 0; transition: opacity 1s ease 0.8s; }
.card-art .fill-accent { fill: var(--accent); opacity: 0; transition: opacity 1.2s ease 0.6s; }
.card-art .pulse { fill: var(--accent); filter: drop-shadow(0 0 6px var(--accent)); opacity: 0; transition: opacity 0.6s ease 1.1s; }
.card-art .dots circle { fill: var(--fg); opacity: 0.7; }
.card-art .nodes circle { fill: rgba(245, 245, 247, 0.55); }
.card-art .node-accent { fill: var(--accent); filter: drop-shadow(0 0 8px var(--accent)); }
.card-art .node-core { fill: var(--fg); }
.card-art .bar { fill: rgba(255, 255, 255, 0.14); }
.card-art .bar-accent { fill: var(--accent); transform-box: fill-box; transform-origin: left; transform: scaleX(0.68); transition: transform 1.4s var(--ease-out) var(--g, 0s); }
.card-art .bar.shrink { transform-box: fill-box; transform-origin: left; transition: transform 1.2s var(--ease-out) 0.3s, opacity 1.2s ease 0.3s; }
.card-art .frame { fill: rgba(255, 255, 255, 0.04); stroke: rgba(255, 255, 255, 0.18); stroke-width: 1.2; }
.card-art .frame-hero { fill: rgba(255, 107, 44, 0.10); stroke: var(--accent); }
.card-art .sweep path { fill: rgba(255, 107, 44, 0.16); }
.card-art .sweep { transform-origin: 160px 90px; animation: sweep 4s linear infinite; animation-play-state: paused; }
.card-art .blip { fill: var(--accent); opacity: 0; animation: blip 4s ease-out infinite; animation-play-state: paused; }
.card-art .blip.b2 { animation-delay: 1.6s; }
.card-art .blip.b3 { animation-delay: 2.8s; }
@keyframes sweep { to { transform: rotate(360deg); } }
@keyframes blip { 0%, 4% { opacity: 0; } 8% { opacity: 1; } 60%, 100% { opacity: 0; } }

.card.in .draw { stroke-dashoffset: 0; }
.card.in .draw.dash { opacity: 1; }
.card.in .fill-accent { opacity: 0.14; }
.card.in .pulse { opacity: 1; }
.card.in .bar-accent { transform: scaleX(1); }
.card.in .bar.shrink { transform: scaleX(0.55); opacity: 0.5; }
.card.in .sweep, .card.in .blip { animation-play-state: running; }

.rail-ui { display: flex; align-items: center; justify-content: space-between; margin-top: 28px; }
.rail-dots { display: flex; gap: 8px; }
.rail-dots i { width: 6px; height: 6px; border-radius: 999px; background: rgba(255, 255, 255, 0.22); transition: width 400ms var(--ease-out), background-color 300ms ease; }
.rail-dots i.on { width: 22px; background: var(--fg); }
.rail-paddles { display: flex; gap: 12px; }
.paddle {
  width: 44px; height: 44px; border-radius: 50%;
  border: 0; background: rgba(255, 255, 255, 0.1);
  display: grid; place-items: center; cursor: pointer;
  transition: background-color 200ms ease, transform 100ms ease-out, opacity 200ms ease;
}
.paddle svg { width: 20px; height: 20px; fill: none; stroke: var(--fg); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.paddle:hover { background: rgba(255, 255, 255, 0.16); }
.paddle:active { transform: scale(0.94); }
.paddle[disabled] { opacity: 0.35; cursor: default; }

/* ─── Agents ─── */
.agents { padding: 14vh 0 18vh; }
.agents-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.agents-copy .lead { margin-top: 28px; }
.console {
  border-radius: var(--radius-l);
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid var(--hair);
  box-shadow: 0 40px 120px -40px rgba(255, 107, 44, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  overflow: hidden;
}
.console-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 22px; border-bottom: 1px solid var(--hair);
  font: 500 12px/1 var(--mono); color: var(--muted); letter-spacing: 0.02em;
}
.live { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); text-transform: uppercase; letter-spacing: 0.1em; font-size: 11px; }
.live i { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); animation: blink 1.6s ease-in-out infinite; }
.console-body { padding: 22px 22px 26px; font: 400 14px/1.5 var(--mono); min-height: 280px; }
.console-body p { margin: 0 0 12px; color: rgba(245, 245, 247, 0.82); display: flex; gap: 12px; }
.console-body p::before { content: attr(data-line); color: var(--accent); flex: 0 0 auto; }
.console-body p.ok { color: var(--fg); }
.console-body p.ok::before { color: #30d158; }
.console-body .caret { display: inline-block; width: 8px; height: 1.1em; background: var(--accent); vertical-align: -3px; margin-left: 2px; animation: caret 1s steps(1) infinite; }
@keyframes caret { 50% { opacity: 0; } }

/* ─── Principles (light) ─── */
.principles { background: var(--light-bg); color: var(--light-fg); padding: 16vh 0; }
.principles .eyebrow { color: var(--light-muted); }
.principle-grid { margin-top: 56px; display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.principle {
  padding: 40px 40px 44px; border-radius: var(--radius-l);
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 20px 40px -24px rgba(0, 0, 0, 0.12);
}
.principle-index { font: 500 12px/1 var(--mono); letter-spacing: 0.06em; color: #d9480f; }
.principle h3 { margin: 20px 0 12px; font-size: clamp(26px, 2.6vw, 34px); line-height: 1.08; font-weight: 600; letter-spacing: -0.03em; }
.principle p { margin: 0; font-size: 17px; line-height: 1.5; color: var(--light-muted); max-width: 30em; }

/* ─── Origin ─── */
.origin { padding: 20vh 0 10vh; text-align: center; overflow: hidden; }
.origin-year {
  margin: 0;
  font-size: clamp(120px, 26vw, 360px);
  line-height: 0.85; font-weight: 700; letter-spacing: -0.06em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.16);
  background: linear-gradient(180deg, rgba(255, 107, 44, 0.32), rgba(255, 107, 44, 0) 75%);
  -webkit-background-clip: text; background-clip: text;
  user-select: none;
}
.origin-title { margin: -0.4em 0 0; position: relative; font-size: clamp(36px, 5.4vw, 72px); line-height: 1.04; font-weight: 600; letter-spacing: -0.035em; }
.origin-lead { margin: 28px auto 0; }

/* ─── Contact ─── */
.contact { padding: 12vh 0 18vh; }
.contact-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 64px; align-items: start; }
.contact-copy .lead { margin-top: 28px; }
.form-card {
  position: relative;
  padding: 36px;
  border-radius: var(--radius-l);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--hair);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  backdrop-filter: blur(24px) saturate(160%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.07);
}
.form { display: grid; gap: 16px; }

.segmented {
  position: relative; display: grid; grid-template-columns: repeat(4, 1fr);
  margin: 0 0 8px; padding: 4px; border: 0; border-radius: 14px;
  background: rgba(255, 255, 255, 0.06);
}
.segmented label { position: relative; z-index: 1; }
.segmented input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.segmented label span {
  display: grid; place-items: center; min-height: 40px; padding: 0 6px;
  font-size: 14px; font-weight: 500; color: var(--muted);
  border-radius: 10px; cursor: pointer;
  transition: color 250ms ease;
}
.segmented input:checked + span { color: var(--fg); }
.segmented input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: -2px; }
.seg-pill {
  position: absolute; top: 4px; left: 0; height: calc(100% - 8px); width: 0;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.12);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 4px 14px rgba(0, 0, 0, 0.3);
  will-change: transform, width;
}

.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { position: relative; }
.field input, .field textarea {
  width: 100%;
  padding: 26px 16px 10px;
  border-radius: 14px;
  border: 1px solid var(--hair-strong);
  background: rgba(0, 0, 0, 0.35);
  color: var(--fg);
  font: 400 17px/1.4 var(--font);
  letter-spacing: -0.01em;
  outline: none;
  transition: border-color 200ms ease, background-color 200ms ease, box-shadow 200ms ease;
  -webkit-appearance: none; appearance: none;
}
.field textarea { resize: vertical; min-height: 140px; }
.field label {
  position: absolute; left: 17px; top: 18px;
  font-size: 17px; color: var(--muted);
  pointer-events: none; transform-origin: left top;
  transition: transform 260ms var(--ease-out), color 200ms ease;
}
.field .opt { font-size: 0.8em; color: var(--dim); margin-left: 4px; }
.field input:focus, .field textarea:focus { border-color: rgba(255, 107, 44, 0.7); box-shadow: 0 0 0 4px var(--accent-soft); background: rgba(0, 0, 0, 0.5); }
.field input:focus + label, .field textarea:focus + label,
.field input:not(:placeholder-shown) + label, .field textarea:not(:placeholder-shown) + label {
  transform: translateY(-10px) scale(0.72);
}
.field input:focus + label, .field textarea:focus + label { color: var(--accent); }
.field.is-invalid input, .field.is-invalid textarea { border-color: #ff453a; }
.field-msg { display: block; min-height: 0; font-size: 13px; color: #ff6961; padding: 0 4px; }
.field-msg:not(:empty) { margin-top: 6px; }

.form-foot { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 8px; flex-wrap: wrap; }
.form-note { margin: 0; font-size: 14px; color: var(--dim); }
.btn-submit { min-width: 168px; }
.btn-submit .spinner {
  position: absolute; width: 20px; height: 20px; border-radius: 50%;
  border: 2px solid rgba(0, 0, 0, 0.18); border-top-color: #000;
  opacity: 0; animation: spin 0.8s linear infinite;
}
.btn-submit.is-loading .btn-label { opacity: 0; }
.btn-submit.is-loading .spinner { opacity: 1; }
.btn-submit[disabled] { cursor: progress; }
@keyframes spin { to { transform: rotate(360deg); } }
.form-error { margin: 4px 0 0; padding: 12px 16px; border-radius: 12px; background: rgba(255, 69, 58, 0.12); color: #ff8a80; font-size: 14px; }
.form-error a { color: #fff; text-decoration: underline; text-underline-offset: 2px; }

.form-done { text-align: center; padding: 56px 12px; }
.form-done h3 { margin: 24px 0 8px; font-size: 32px; font-weight: 600; letter-spacing: -0.03em; }
.form-done p { margin: 0; color: var(--muted); font-size: 17px; }
.done-check { width: 72px; height: 72px; margin: 0 auto; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.done-check circle { stroke: rgba(255, 107, 44, 0.35); stroke-width: 2; stroke-dasharray: 190; stroke-dashoffset: 190; animation: draw 900ms var(--ease-out) forwards; }
.done-check path { stroke: var(--accent); stroke-width: 3.5; stroke-dasharray: 48; stroke-dashoffset: 48; animation: draw 600ms var(--ease-out) 450ms forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }

/* ─── Footer ─── */
.footer { border-top: 1px solid var(--hair); padding: 40px 0 48px; }
.footer-inner { display: grid; grid-template-columns: auto 1fr; gap: 24px 40px; align-items: center; }
.footer-links { display: flex; gap: 28px; justify-content: flex-end; flex-wrap: wrap; font-size: 14px; color: var(--muted); }
.footer-links a:hover { color: var(--fg); }
.footer-legal { grid-column: 1 / -1; margin: 0; font-size: 12px; color: var(--dim); }

/* ─── Responsive ─── */
@media (max-width: 960px) {
  .nav-links { display: none; }
  .claim { grid-template-columns: 1fr; gap: 18px; padding: 44px 0; }
  .engine { height: 400vh; }
  .engine-sticky { grid-template-columns: 1fr; grid-template-rows: auto 1fr; gap: 12px; padding: 64px var(--gutter) 24px; align-content: start; }
  .engine-visual { order: -1; height: 38vh; height: 38svh; }
  .engine-copy .section-title { font-size: clamp(32px, 8vw, 48px); margin-bottom: 20px; }
  .steps { gap: 0; padding-left: 20px; }
  .step { display: none; }
  .step.is-active { display: block; animation: stepIn 500ms var(--ease-out); }
  .research-head, .agents-grid, .contact-grid { grid-template-columns: 1fr; gap: 28px; }
  .research-intro { justify-self: start; }
  .principle-grid { grid-template-columns: 1fr; }
  .manifesto { height: 220vh; }
}
@keyframes stepIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero-content { padding: 110px 20px 120px; }
  .hero-cta .btn { width: 100%; }
  .eyebrow-mid { display: none; }
  .card { height: 520px; padding: 28px 26px 0; }
  .card h3 { font-size: 25px; }
  .card-art { width: calc(100% + 52px); margin-left: -26px; }
  .field-row { grid-template-columns: 1fr; }
  .form-card { padding: 22px; border-radius: 24px; }
  .segmented label span { font-size: 13px; }
  .form-foot { flex-direction: column-reverse; align-items: stretch; }
  .btn-submit { width: 100%; }
  .principle { padding: 32px 26px 34px; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; gap: 20px; }
  .console-body { font-size: 13px; padding: 18px; }
}

/* ─── Accessibility preferences ─── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .materialize, .reveal { filter: none !important; transform: none !important; transition: opacity 400ms ease !important; }
  .manifesto { height: auto; }
  .manifesto-sticky { position: static; height: auto; padding: 18vh var(--gutter); }
  .manifesto-text .w { opacity: 1 !important; }
  .card-art .draw { stroke-dashoffset: 0; transition: none; }
  .card-art .sweep, .card-art .blip, .live i, .hero-legend .dot { animation: none; }
  .card-art .blip { opacity: 1; }
  .step p { transition: none; }
}
@media (prefers-reduced-transparency: reduce) {
  .nav { background: rgba(0, 0, 0, calc(var(--m) * 0.96)); -webkit-backdrop-filter: none; backdrop-filter: none; }
  .form-card { background: #111; -webkit-backdrop-filter: none; backdrop-filter: none; }
}
@media (prefers-contrast: more) {
  :root { --muted: #b0b0b5; --hair: rgba(255, 255, 255, 0.3); }
  .field input, .field textarea { border-color: rgba(255, 255, 255, 0.5); }
}