/* ==========================================================================
   DS-Intelligence — Digital Sentinel
   Art direction: a descent through representations of intelligence.
   00 cosmos · 01 mind · 02 knowledge · 03 vault · 04 product · 05 craft · 06 trust
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Surfaces — an almost imperceptible tonal drift from top to bottom */
  --ink:            #05070b;
  --ink-mind:       #06080e;
  --ink-flow:       #090b10;
  --ink-vault:      #060a16;
  --ink-product:    #05070b;
  --ink-caps:       #07090e;
  --ink-trust:      #0c0f17;
  --ink-close:      #030509;

  /* Type */
  --paper:          #eef1f5;
  --paper-dim:      #b9c1cf;
  --muted:          #79839a;
  --faint:          #454f63;

  /* Accents — used sparingly, only where attention belongs */
  --ice:            #8fe6f2;
  --ice-deep:       #35a8c2;
  --violet:         #6f63d8;

  /* Structure */
  --rule:           rgba(233, 238, 247, 0.09);
  --rule-strong:    rgba(233, 238, 247, 0.16);

  --font-sans: "Instrument Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: "Instrument Serif", ui-serif, Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --fs-hero:  clamp(2.85rem, 8.2vw, 7.6rem);
  --fs-h2:    clamp(2rem, 4.5vw, 4.15rem);
  --fs-h3:    clamp(1.1rem, 1.35vw, 1.36rem);
  --fs-lead:  clamp(1.01rem, 1.1vw, 1.15rem);
  --fs-body:  clamp(0.94rem, 0.95vw, 1rem);
  --fs-meta:  0.685rem;

  --gutter:   clamp(20px, 5vw, 80px);
  --measure:  62ch;

  --chapter-y: clamp(110px, 14vw, 210px);

  --ease: cubic-bezier(0.22, 0.61, 0.28, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   2. Reset & base
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

html, body { overflow-x: clip; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.72;
  font-weight: 400;
  letter-spacing: -0.006em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { margin: 0; font-weight: 500; letter-spacing: -0.038em; line-height: 1.02; text-wrap: balance; }
p { margin: 0; }
ul, ol, dl, dd { margin: 0; padding: 0; }
li { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
canvas { display: block; }
html[data-lang="en"]:not(.is-i18n-ready) body { visibility: hidden; }
html[data-lang="en"] .hero__title { max-width: 20ch; }
address { font-style: normal; }
::selection { background: rgba(143, 230, 242, 0.22); color: #fff; }

:focus-visible {
  outline: 1px solid var(--ice);
  outline-offset: 4px;
  border-radius: 2px;
}

.skip-link {
  position: fixed;
  top: 12px; left: 12px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--ink);
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  transform: translateY(-160%);
  transition: transform 0.25s var(--ease);
}
.skip-link:focus { transform: none; }

.wrap {
  width: 100%;
  max-width: 1360px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Shared type primitives ---------------------------------------------------- */
.lead {
  font-size: var(--fs-lead);
  line-height: 1.75;
  color: var(--paper-dim);
  max-width: 54ch;
  font-weight: 400;
}

.h-display {
  font-size: var(--fs-h2);
  line-height: 1.03;
  letter-spacing: -0.042em;
  max-width: 19ch;
}
.h-display + .lead { margin-top: clamp(20px, 2.4vw, 32px); }
.h-display em,
.hero__title em,
.emergence__title em,
.closing__title em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: #fff;
}

.eyebrow,
.chapter-mark,
.ledger__key,
.signals__key,
.footer__key,
.cap__index,
.cascade__no,
.scroll-hint__label,
.emergence__stage,
.product__scene-caption,
.closing__seq {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 400;
}

.chapter-mark {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  margin-bottom: clamp(24px, 3vw, 40px);
}
.chapter-mark b {
  font-weight: 400;
  color: var(--ice);
  position: relative;
  padding-right: 14px;
}
.chapter-mark b::after {
  content: "";
  position: absolute;
  right: 0; top: 50%;
  width: 1px; height: 9px;
  background: var(--rule-strong);
  transform: translateY(-50%);
}

/* Links & CTAs -------------------------------------------------------------- */
.link-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  letter-spacing: -0.008em;
  color: var(--paper);
  padding-block: 6px;
  position: relative;
  transition: color 0.3s var(--ease), gap 0.3s var(--ease);
}
.link-cta::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--rule-strong);
  transform-origin: left;
  transition: background 0.35s var(--ease), transform 0.45s var(--ease-out);
}
.link-cta svg { flex: none; transition: transform 0.4s var(--ease-out); }
.link-cta:hover { color: #fff; gap: 13px; }
.link-cta:hover::after { background: var(--ice); }
.link-cta:hover svg { transform: translateX(2px); }

.link-cta--primary {
  font-size: 1rem;
  padding: 15px 26px;
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  background: rgba(233, 238, 247, 0.02);
  overflow: hidden;
  isolation: isolate;
}
.link-cta--primary::after { display: none; }
.link-cta--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(120% 180% at 50% 130%, rgba(143, 230, 242, 0.22), transparent 62%);
  opacity: 0;
  transition: opacity 0.5s var(--ease);
}
.link-cta--primary:hover {
  border-color: rgba(143, 230, 242, 0.4);
  box-shadow: 0 0 0 1px rgba(143, 230, 242, 0.06), 0 18px 50px -28px rgba(143, 230, 242, 0.5);
}
.link-cta--primary:hover::before { opacity: 1; }

.inline-link {
  color: #fff;
  border-bottom: 1px solid rgba(143, 230, 242, 0.5);
  padding-bottom: 1px;
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
}
.inline-link:hover { border-color: var(--ice); color: var(--ice); }

/* --------------------------------------------------------------------------
   3. Atmosphere layers
   -------------------------------------------------------------------------- */
.backdrop-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100%;
  height: 100dvh;
  z-index: 0;
  pointer-events: none;
  will-change: opacity;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0.03;
  background-image:
    radial-gradient(circle at 20% 22%, #fff 0 0.6px, transparent 0.6px),
    radial-gradient(circle at 74% 66%, #fff 0 0.6px, transparent 0.6px),
    radial-gradient(circle at 46% 84%, #fff 0 0.5px, transparent 0.5px);
  background-size: 91px 91px, 137px 137px, 173px 173px;
  animation: grainShift 6s steps(3) infinite;
}
@keyframes grainShift {
  0%   { background-position: 0 0, 0 0, 0 0; }
  33%  { background-position: 13px -7px, -9px 11px, 6px 9px; }
  66%  { background-position: -8px 9px, 12px -6px, -11px -5px; }
  100% { background-position: 0 0, 0 0, 0 0; }
}

main { position: relative; z-index: 2; }

body.is-locked { overflow: hidden; }

/* --------------------------------------------------------------------------
   4. Masthead
   -------------------------------------------------------------------------- */
.masthead {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.5s var(--ease), backdrop-filter 0.5s var(--ease);
}
.masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 7, 11, 0.86), rgba(5, 7, 11, 0.4) 62%, transparent);
  opacity: 0;
  transition: opacity 0.55s var(--ease);
  pointer-events: none;
}
.masthead.is-stuck::before { opacity: 1; }
.masthead.is-stuck { backdrop-filter: blur(14px) saturate(120%); -webkit-backdrop-filter: blur(14px) saturate(120%); }

.masthead__inner {
  position: relative;
  width: 100%;
  max-width: 1360px;
  margin-inline: auto;
  padding: 0 var(--gutter);
  height: 74px;
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 48px);
}

.masthead__rule {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--rule) 12%, var(--rule) 88%, transparent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.7s var(--ease-out);
}
.masthead.is-stuck .masthead__rule { transform: scaleX(1); }

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: none;
  color: var(--paper);
}
.wordmark__mark {
  width: 28px; height: 28px;
  display: block;
  color: var(--paper);
  transition: color 0.4s var(--ease), transform 0.6s var(--ease-out);
}
.wordmark__mark svg { width: 100%; height: 100%; display: block; }
.wordmark__core { fill: var(--ice); }
.wordmark:hover .wordmark__mark { transform: rotate(60deg); }
.wordmark__text {
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: -0.018em;
  white-space: nowrap;
}

.masthead__nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 1.9vw, 30px);
  margin-left: auto;
}
.masthead__nav a {
  position: relative;
  font-size: 0.845rem;
  color: var(--muted);
  white-space: nowrap;
  padding-block: 6px;
  transition: color 0.3s var(--ease);
}
.masthead__nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: var(--ice);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.45s var(--ease-out);
}
.masthead__nav a:hover { color: var(--paper); }
.masthead__nav a.is-active { color: var(--paper); }
.masthead__nav a.is-active::after { transform: scaleX(1); transform-origin: left; }

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  margin-left: 2px;
}
.lang-switch__btn {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  color: var(--faint);
  padding: 8px 0;
  transition: color 0.3s var(--ease);
}
.lang-switch__btn:hover { color: var(--paper); }
.lang-switch__btn.is-active { color: var(--ice); }
.lang-switch__sep {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--faint);
  opacity: 0.45;
  pointer-events: none;
}

.masthead__cta { flex: none; font-size: 0.845rem; }
.masthead__cta::after { background: var(--rule); }

.masthead__burger {
  display: none;
  margin-left: auto;
  width: 38px; height: 38px;
  position: relative;
  flex: none;
}
.masthead__burger span {
  position: absolute;
  left: 9px;
  width: 20px; height: 1px;
  background: var(--paper);
  transition: transform 0.4s var(--ease-out), opacity 0.3s;
}
.masthead__burger span:nth-child(1) { top: 17px; }
.masthead__burger span:nth-child(2) { top: 22px; }
.masthead__burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(2.5px) rotate(45deg); }
.masthead__burger[aria-expanded="true"] span:nth-child(2) { transform: translateY(-2.5px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(4, 6, 10, 0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 120px var(--gutter) 48px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}
.mobile-menu[hidden] { display: none; }
.mobile-menu.is-open { opacity: 1; }
.mobile-menu nav { display: flex; flex-direction: column; }
.mobile-menu a {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
  font-size: clamp(1.4rem, 6vw, 2rem);
  letter-spacing: -0.035em;
  color: var(--paper);
}
.mobile-menu a em {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  color: var(--ice);
}
.mobile-menu__cta {
  margin-top: 40px;
  font-size: 1rem;
  color: var(--ice);
  border-top: 1px solid var(--rule);
  padding-top: 24px;
}

/* --------------------------------------------------------------------------
   5. Hero — chapter 00 / cosmos
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: max(104px, 13svh);
  padding-bottom: clamp(22px, 3svh, 34px);
}

.hero__grid {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 1360px;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper-dim);
  margin-bottom: clamp(20px, 3.2svh, 38px);
}
.eyebrow__dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--ice);
  box-shadow: 0 0 12px rgba(143, 230, 242, 0.9);
  animation: sentinelPulse 4.5s ease-in-out infinite;
}
@keyframes sentinelPulse {
  0%, 100% { opacity: 0.45; transform: scale(0.85); }
  50%      { opacity: 1; transform: scale(1); }
}
.eyebrow__sep { color: var(--faint); }

.hero__title {
  font-size: var(--fs-hero);
  line-height: 0.94;
  letter-spacing: -0.05em;
  max-width: 16ch;
  font-weight: 500;
}
.hero__title em { letter-spacing: -0.02em; }

.hero__lead {
  margin-top: clamp(20px, 3.2svh, 36px);
  max-width: 46ch;
}

.hero__actions {
  margin-top: clamp(26px, 4svh, 46px);
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.4vw, 34px);
  flex-wrap: wrap;
}

.hero__foot {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 30px;
  margin-top: clamp(30px, 5svh, 76px);
}

.spec {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  flex: 1;
  max-width: 900px;
  border-top: 1px solid var(--rule);
}
.spec li {
  padding: 16px clamp(12px, 1.6vw, 22px) 4px 0;
  position: relative;
}
.spec li + li {
  padding-left: clamp(12px, 1.6vw, 22px);
  border-left: 1px solid var(--rule);
}
.spec li span {
  display: block;
  font-size: 0.8rem;
  color: var(--paper-dim);
  letter-spacing: -0.004em;
  position: relative;
}
.spec li::before {
  content: "";
  position: absolute;
  left: 0; top: -1px;
  width: 0; height: 1px;
  background: var(--ice);
  opacity: 0.8;
  transition: width 0.9s var(--ease-out) 0.7s;
}
.spec.is-visible li::before { width: 20px; }

.scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  flex: none;
  padding-bottom: 4px;
}
.scroll-hint__label { color: var(--faint); font-size: 0.6rem; letter-spacing: 0.28em; }
.scroll-hint__line {
  width: 1px; height: 52px;
  background: linear-gradient(180deg, var(--rule-strong), transparent);
  position: relative;
  overflow: hidden;
}
.scroll-hint__line::after {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 1px; height: 16px;
  background: var(--ice);
  animation: scrollTrace 2.8s var(--ease) infinite;
}
@keyframes scrollTrace {
  0%   { transform: translateY(-18px); opacity: 0; }
  30%  { opacity: 1; }
  100% { transform: translateY(52px); opacity: 0; }
}

/* --------------------------------------------------------------------------
   6. Emergence — the space → intelligence transition
   -------------------------------------------------------------------------- */
.emergence {
  position: relative;
  height: 210vh;
}
.emergence__sticky {
  position: sticky;
  top: 0;
  height: 100svh;
  display: grid;
  place-items: center;
}
.emergence__inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  opacity: var(--emerge-opacity, 1);
  transform: translateY(var(--emerge-shift, 0px));
  transition: opacity 0.1s linear;
}

.emergence__stage {
  display: flex;
  gap: 0;
  color: var(--faint);
  margin-bottom: clamp(30px, 4vw, 54px);
  font-size: 0.62rem;
  letter-spacing: 0.26em;
  flex-wrap: wrap;
  justify-content: center;
}
.emergence__stage span {
  padding: 0 clamp(10px, 1.6vw, 22px);
  position: relative;
  transition: color 0.6s var(--ease);
}
.emergence__stage span + span::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 1px; height: 8px;
  background: var(--rule);
  transform: translateY(-50%);
}
.emergence__stage span.is-on { color: var(--ice); }

.emergence__title {
  font-size: clamp(2rem, 5.2vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: -0.042em;
  max-width: 17ch;
}
.emergence__body {
  margin-top: clamp(26px, 3vw, 40px);
  max-width: 52ch;
  color: var(--muted);
  font-size: var(--fs-lead);
  line-height: 1.8;
}

/* Ledger — the four core parameters, as an index rather than cards */
.ledger {
  position: relative;
  padding-bottom: clamp(90px, 12vw, 170px);
}
.ledger__list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
}
.ledger__list li {
  padding: clamp(24px, 2.4vw, 34px) clamp(18px, 2vw, 30px) 0 0;
  position: relative;
}
.ledger__list li + li {
  padding-left: clamp(18px, 2vw, 30px);
  border-left: 1px solid var(--rule);
}
.ledger__key { display: block; color: var(--ice); margin-bottom: 14px; opacity: 0.85; }
.ledger__list h3 { font-size: 1.12rem; letter-spacing: -0.03em; margin-bottom: 10px; }
.ledger__list p { color: var(--muted); font-size: 0.9rem; line-height: 1.68; max-width: 30ch; }

/* --------------------------------------------------------------------------
   7. Chapter shells & tonal transitions
   -------------------------------------------------------------------------- */
.chapter {
  position: relative;
  padding-block: var(--chapter-y);
  scroll-margin-top: 74px;
}
.chapter > .wrap { position: relative; z-index: 2; }

.chapter--mind {
  overflow: clip;
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-mind) 20%, var(--ink-mind) 80%, var(--ink-flow) 100%);
}
.chapter--flow {
  overflow: clip;
  background: linear-gradient(180deg, var(--ink-flow) 0%, #0a0c12 40%, var(--ink-vault) 100%);
}
.chapter--vault {
  overflow: clip;
  background: linear-gradient(180deg, var(--ink-vault) 0%, #071020 46%, #05070c 100%);
}
.chapter--product {
  background: linear-gradient(180deg, #05070c 0%, var(--ink-product) 26%, var(--ink-product) 74%, var(--ink-caps) 100%);
}
.chapter--caps {
  background: linear-gradient(180deg, var(--ink-caps) 0%, #080b11 50%, var(--ink-trust) 100%);
}
.chapter--trust {
  background: linear-gradient(180deg, var(--ink-trust) 0%, #0d1119 40%, var(--ink-close) 100%);
}

/* --------------------------------------------------------------------------
   8. Chapter 01 — Mind
   -------------------------------------------------------------------------- */
.chapter--mind::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(70% 55% at 78% 32%, rgba(111, 99, 216, 0.09), transparent 70%);
  pointer-events: none;
}

.mind__grid {
  display: grid;
  grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
  gap: clamp(36px, 5vw, 84px);
  align-items: center;
}

.mind__art {
  position: relative;
  aspect-ratio: 1 / 1;
  margin-right: calc(var(--gutter) * -1);
  margin-block: clamp(-20px, -2vw, 0px);
}
.mind__art canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  /* the silhouette must dissolve into darkness, never sit in a box */
  -webkit-mask-image:
    radial-gradient(68% 68% at 52% 44%, #000 50%, rgba(0, 0, 0, 0.5) 76%, transparent 94%),
    linear-gradient(208deg, #000 44%, rgba(0, 0, 0, 0.3) 76%, transparent 92%);
  mask-image:
    radial-gradient(68% 68% at 52% 44%, #000 50%, rgba(0, 0, 0, 0.5) 76%, transparent 94%),
    linear-gradient(208deg, #000 44%, rgba(0, 0, 0, 0.3) 76%, transparent 92%);
  -webkit-mask-composite: source-in;
  mask-composite: intersect;
}

.rule-list {
  margin-top: clamp(34px, 4vw, 56px);
  border-top: 1px solid var(--rule);
}
.rule-list > div {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(16px, 2.4vw, 40px);
  padding: clamp(20px, 2vw, 26px) 0;
  border-bottom: 1px solid var(--rule);
  transition: background 0.5s var(--ease);
}
.rule-list > div:hover { background: rgba(233, 238, 247, 0.014); }
.rule-list dt {
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: -0.025em;
  color: var(--paper);
}
.rule-list dd { color: var(--muted); font-size: 0.92rem; line-height: 1.68; }

.signals {
  margin-top: clamp(80px, 10vw, 150px);
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
}
.signals li {
  padding: clamp(22px, 2.2vw, 30px) clamp(14px, 1.5vw, 22px) 0 0;
  position: relative;
}
.signals li + li { padding-left: clamp(14px, 1.5vw, 22px); border-left: 1px solid var(--rule); }
.signals li::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: 0; height: 1px;
  background: var(--ice);
  transition: width 0.9s var(--ease-out) 0.1s;
}
.signals li.is-visible::before { width: 26px; }
.signals__key { display: block; color: var(--faint); margin-bottom: 12px; font-size: 0.6rem; }
.signals h3 { font-size: 0.98rem; letter-spacing: -0.025em; margin-bottom: 9px; }
.signals p { color: var(--muted); font-size: 0.855rem; line-height: 1.62; }

/* --------------------------------------------------------------------------
   9. Chapter 02 — Knowledge / data flow
   -------------------------------------------------------------------------- */
.flow__field {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.flow__field canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.flow__field::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ink-flow) 0%, transparent 16%, transparent 84%, var(--ink-vault) 100%);
}

.flow__terms { position: absolute; inset: 0; }
.flow__terms span {
  position: absolute;
  left: var(--x);
  top: var(--y);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(185, 193, 207, 0.3);
  white-space: nowrap;
  animation: termDrift 17s ease-in-out infinite;
  animation-delay: var(--d);
}
@keyframes termDrift {
  0%, 100% { opacity: 0.28; transform: translate3d(0, 0, 0); }
  45%      { opacity: 0.85; transform: translate3d(14px, -8px, 0); }
}

.flow__head { margin-bottom: clamp(56px, 7vw, 110px); }
.flow__head .lead { margin-top: clamp(20px, 2.4vw, 32px); }

.cascade {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: clamp(16px, 2vw, 32px);
  position: relative;
  z-index: 2;
}
.cascade li {
  position: relative;
  padding-top: clamp(20px, 2vw, 28px);
  padding-bottom: clamp(34px, 4vw, 58px);
  border-top: 1px solid var(--rule);
}
.cascade li:nth-child(1) { grid-column: 1 / span 5; }
.cascade li:nth-child(2) { grid-column: 3 / span 5; }
.cascade li:nth-child(3) { grid-column: 5 / span 5; }
.cascade li:nth-child(4) { grid-column: 7 / span 5; }
.cascade li:nth-child(5) { grid-column: 8 / span 5; }
.cascade li::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: 0; height: 1px;
  background: linear-gradient(90deg, var(--ice), transparent);
  transition: width 1.1s var(--ease-out) 0.15s;
}
.cascade li.is-visible::before { width: 60%; }
.cascade__no {
  display: block;
  color: var(--ice);
  opacity: 0.7;
  margin-bottom: 16px;
}
.cascade h3 {
  font-size: clamp(1.2rem, 1.8vw, 1.6rem);
  letter-spacing: -0.035em;
  line-height: 1.16;
  margin-bottom: 12px;
  max-width: 22ch;
}
.cascade p { color: var(--muted); font-size: 0.93rem; line-height: 1.7; max-width: 44ch; }

/* --------------------------------------------------------------------------
   10. Chapter 03 — Vault / on-premise
   -------------------------------------------------------------------------- */
.vault__lattice {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(143, 230, 242, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 230, 242, 0.05) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: radial-gradient(62% 52% at 50% 52%, #000 0%, transparent 74%);
  -webkit-mask-image: radial-gradient(62% 52% at 50% 52%, #000 0%, transparent 74%);
  opacity: 0.55;
}

.vault__head { text-align: center; display: flex; flex-direction: column; align-items: center; }
.vault__head .h-display { max-width: 16ch; }
.vault__head .chapter-mark { justify-content: center; }

.vault__stage {
  position: relative;
  display: grid;
  grid-template-areas: "stack";
  place-items: center;
  min-height: clamp(400px, 62vh, 680px);
  perspective: 2100px;
  perspective-origin: 50% 44%;
  margin-block: clamp(30px, 5vw, 70px);
}
.vault__scene, .vault__labels { grid-area: stack; }
.vault__labels {
  position: relative;
  justify-self: stretch;
  align-self: stretch;
  z-index: 3;
  pointer-events: none;
}

.vault__scene {
  position: relative;
  width: min(420px, 60vw);
  height: min(420px, 60vw);
  transform-style: preserve-3d;
  transform:
    rotateX(calc(13deg + var(--vault-rx, 0deg)))
    rotateY(calc(-20deg + var(--vault-ry, 0deg)));
  transition: transform 0.9s var(--ease-out);
}

.vault__perimeter {
  position: absolute;
  left: 50%; top: 50%;
  width: 760px; height: 760px;
  margin: -380px 0 0 -380px;
  transform: translateY(196px) rotateX(79deg);
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(6, 12, 24, 0.9) 0 16%, transparent 42%),
    repeating-radial-gradient(circle,
      transparent 0 52px,
      rgba(143, 230, 242, 0.22) 52px 53px);
  mask-image: radial-gradient(circle, #000 18%, rgba(0, 0, 0, 0.6) 44%, transparent 66%);
  -webkit-mask-image: radial-gradient(circle, #000 18%, rgba(0, 0, 0, 0.6) 44%, transparent 66%);
}

.vault__body {
  position: absolute;
  left: 50%; top: 50%;
  width: 216px; height: 340px;
  margin: -170px 0 0 -108px;
  transform-style: preserve-3d;
  animation: vaultDrift 34s ease-in-out infinite alternate;
}
@keyframes vaultDrift {
  from { transform: rotateY(-3deg); }
  to   { transform: rotateY(5deg); }
}

.vault__face {
  position: absolute;
  display: block;
  border: 1px solid rgba(233, 238, 247, 0.13);
}
.vault__face--front {
  inset: 0;
  transform: translateZ(80px);
  background:
    linear-gradient(100deg, rgba(160, 210, 235, 0.09) 0%, transparent 14%),
    linear-gradient(165deg, #101828 0%, #090e1a 56%, #05070d 100%);
  box-shadow: inset 0 1px 0 rgba(233, 238, 247, 0.09);
  border-color: rgba(233, 238, 247, 0.17);
}
.vault__face--side {
  top: 0; left: 50%;
  width: 160px; height: 340px;
  margin-left: -80px;
  transform: rotateY(90deg) translateZ(108px);
  background: linear-gradient(180deg, #070b14 0%, #03050a 100%);
  border-color: rgba(233, 238, 247, 0.07);
}
.vault__face--top {
  left: 0; top: 50%;
  width: 216px; height: 160px;
  margin-top: -80px;
  transform: rotateX(90deg) translateZ(170px);
  background: linear-gradient(160deg, #223050 0%, #0d1626 100%);
  border-color: rgba(233, 238, 247, 0.24);
}

.vault__seam {
  position: absolute;
  left: 50%; top: 30px; bottom: 30px;
  width: 3px;
  margin-left: -1.5px;
  transform: translateZ(81px);
  background: linear-gradient(180deg,
    transparent 0%,
    rgba(143, 230, 242, 0.2) 10%,
    rgba(232, 250, 253, 0.95) 50%,
    rgba(143, 230, 242, 0.2) 90%,
    transparent 100%);
  box-shadow: 0 0 30px 5px rgba(143, 230, 242, 0.4), 0 0 90px 18px rgba(143, 230, 242, 0.16);
  animation: seamBreathe 6.5s ease-in-out infinite;
}
@keyframes seamBreathe {
  0%, 100% { opacity: 0.62; }
  50%      { opacity: 1; }
}

.vault__scan {
  position: absolute;
  left: 1px; right: 1px;
  height: 1px;
  top: 0;
  transform: translateZ(81px);
  background: linear-gradient(90deg, transparent, rgba(143, 230, 242, 0.6), transparent);
  animation: vaultScan 9s var(--ease) infinite;
}
@keyframes vaultScan {
  0%       { transform: translateZ(81px) translateY(6px); opacity: 0; }
  12%      { opacity: 1; }
  88%      { opacity: 1; }
  100%     { transform: translateZ(81px) translateY(332px); opacity: 0; }
}

.vault__halo {
  position: absolute;
  left: 50%; top: 50%;
  width: 620px; height: 620px;
  margin: -310px 0 0 -310px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(143, 230, 242, 0.13), rgba(111, 99, 216, 0.05) 38%, transparent 64%);
  transform: translateZ(-110px);
  filter: blur(16px);
}
.vault__scene::after {
  content: "";
  position: absolute;
  left: 50%; top: 50%;
  width: 330px; height: 120px;
  margin: -60px 0 0 -165px;
  transform: translateY(190px) rotateX(80deg);
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(0, 0, 0, 0.75), transparent 70%);
  filter: blur(12px);
}

.vault__label {
  position: absolute;
  z-index: 3;
  font-family: var(--font-mono);
  font-size: 0.635rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper-dim);
  white-space: nowrap;
}
.vault__label span { position: relative; display: block; padding-block: 6px; }
.vault__label span::after {
  content: "";
  position: absolute;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--ice), transparent);
  width: 0;
  transition: width 1s var(--ease-out) 0.2s;
}
.vault__label.is-visible span::after { width: 100%; }
.vault__label--a { left: 2%;  top: 16%; }
.vault__label--b { right: 2%; top: 40%; text-align: right; }
.vault__label--b span::after { background: linear-gradient(270deg, var(--ice), transparent); }
.vault__label--c { left: 8%;  bottom: 16%; }

.vault__copy { display: flex; justify-content: center; }
.vault__copy .lead { text-align: center; max-width: 62ch; }

/* --------------------------------------------------------------------------
   11. Chapter 04 — doklady.ai
   -------------------------------------------------------------------------- */
.product__opener { text-align: center; display: flex; flex-direction: column; align-items: center; }
.product__opener .chapter-mark { justify-content: center; }

.product__wordmark {
  font-size: clamp(2.7rem, 10.5vw, 9rem);
  line-height: 0.9;
  /* lowercase wordmark needs more air than the caps it replaced */
  letter-spacing: -0.042em;
  font-weight: 500;
  /* the gradient is stretched over the ascenders, so the x-height stays bright */
  background: linear-gradient(180deg, #ffffff 12%, #dae2ee 64%, #93a0b5 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.product__tagline {
  margin-top: clamp(20px, 2.4vw, 32px);
  font-size: clamp(1rem, 1.5vw, 1.28rem);
  color: var(--paper-dim);
  letter-spacing: -0.015em;
}
.product__tagline i { font-style: normal; color: var(--ice); padding: 0 6px; }

.product__meta {
  display: flex;
  align-items: center;
  gap: 0;
  margin-top: clamp(18px, 2vw, 26px);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}
.product__meta span { padding: 0 14px; position: relative; }
.product__meta span + span::before {
  content: "";
  position: absolute;
  left: 0; top: 50%;
  width: 1px; height: 9px;
  background: var(--rule-strong);
  transform: translateY(-50%);
}

.product__standfirst {
  margin-top: clamp(20px, 2.2vw, 30px);
  max-width: 46ch;
  color: var(--muted);
  font-size: clamp(0.95rem, 1.05vw, 1.05rem);
  line-height: 1.72;
  font-weight: 400;
}
.product__standfirst--wide {
  margin-top: clamp(70px, 9vw, 130px);
  max-width: 30ch;
  color: var(--paper);
  font-size: clamp(1.3rem, 2.4vw, 2.1rem);
  line-height: 1.16;
  letter-spacing: -0.038em;
  padding-top: clamp(26px, 3vw, 40px);
  border-top: 1px solid var(--rule);
}

.product__scene {
  margin-top: clamp(48px, 6vw, 88px);
  position: relative;
}
.ingest {
  width: 100%;
  height: auto;
  display: block;
  color: var(--paper-dim);
  mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
}

.ingest__doc {
  opacity: 0;
  transform-box: fill-box;
  transform-origin: center;
  animation: docIngest 11s var(--ease) infinite;
  animation-delay: calc(var(--i) * 2.4s);
}
@keyframes docIngest {
  0%   { opacity: 0; transform: translate(-40px, 0) scale(1); }
  12%  { opacity: 0.85; }
  46%  { opacity: 0.85; transform: translate(190px, 0) scale(0.82); }
  62%  { opacity: 0; transform: translate(330px, 0) scale(0.42); }
  100% { opacity: 0; transform: translate(330px, 0) scale(0.42); }
}

.ingest__seam { animation: seamBreathe 5s ease-in-out infinite; }

.ingest__row { opacity: 0; animation: rowSettle 11s var(--ease) infinite; animation-delay: calc(1.4s + var(--i) * 0.55s); }
@keyframes rowSettle {
  0%       { opacity: 0; transform: translateX(-16px); }
  14%, 74% { opacity: 1; transform: translateX(0); }
  92%,100% { opacity: 0; transform: translateX(0); }
}
.ingest__tick { opacity: 0; animation: tickIn 11s var(--ease) infinite; animation-delay: calc(2s + var(--i) * 0.55s); }
@keyframes tickIn {
  0%       { opacity: 0; }
  12%, 74% { opacity: 0.9; }
  92%,100% { opacity: 0; }
}
.ingest__rays path {
  stroke-dasharray: 4 8;
  animation: rayFlow 3.4s linear infinite;
}
@keyframes rayFlow { to { stroke-dashoffset: -24; } }

.product__scene-caption {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 18px;
  color: var(--faint);
  font-size: 0.6rem;
  letter-spacing: 0.24em;
  text-align: center;
}

#produkt-detail { scroll-margin-top: 100px; }
.product__body {
  margin-top: clamp(34px, 4.5vw, 66px);
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(40px, 6vw, 96px);
  align-items: start;
}
.product__narrative { display: grid; gap: clamp(18px, 2vw, 26px); }
.product__narrative p { color: var(--muted); font-size: var(--fs-lead); line-height: 1.78; max-width: 54ch; }
.product__para { color: var(--paper-dim) !important; }
.product__actions { display: flex; align-items: center; gap: clamp(18px, 2.4vw, 34px); flex-wrap: wrap; margin-top: 12px; }

.product__caps { border-top: 1px solid var(--rule); counter-reset: cap; }
.product__caps li {
  counter-increment: cap;
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 12px;
  padding: clamp(16px, 1.8vw, 22px) 0;
  border-bottom: 1px solid var(--rule);
  color: var(--paper-dim);
  font-size: 0.94rem;
  line-height: 1.55;
}
.product__caps li::before {
  content: "0" counter(cap);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--ice);
  opacity: 0.75;
  padding-top: 4px;
}

.dossier {
  margin-top: clamp(70px, 9vw, 130px);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
}
.dossier > div {
  padding: clamp(24px, 2.6vw, 36px) clamp(20px, 2.2vw, 34px) clamp(28px, 3vw, 40px) 0;
  border-bottom: 1px solid var(--rule);
  position: relative;
}
.dossier > div:not(:nth-child(3n + 1)) {
  padding-left: clamp(20px, 2.2vw, 34px);
  border-left: 1px solid var(--rule);
}
.dossier dt {
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: -0.028em;
  margin-bottom: 12px;
}
.dossier dd { color: var(--muted); font-size: 0.9rem; line-height: 1.7; }

/* --------------------------------------------------------------------------
   12. Chapter 05 — Capabilities
   -------------------------------------------------------------------------- */
.caps__head { margin-bottom: clamp(30px, 4vw, 56px); }
.caps__head .lead { margin-top: clamp(20px, 2.4vw, 32px); max-width: 62ch; }

.cap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 90px);
  align-items: center;
  padding-block: clamp(44px, 6vw, 88px);
  border-top: 1px solid var(--rule);
}
.cap--reverse .cap__text { order: 2; }
.cap__index { display: block; color: var(--ice); opacity: 0.7; margin-bottom: 18px; }
.cap__text h3 {
  font-size: clamp(1.5rem, 2.6vw, 2.3rem);
  letter-spacing: -0.04em;
  margin-bottom: 16px;
}
.cap__text p { color: var(--muted); font-size: 0.98rem; line-height: 1.74; max-width: 42ch; }

.cap__art {
  color: var(--paper-dim);
  opacity: 0.62;
  transition: opacity 0.7s var(--ease);
}
.cap:hover .cap__art { opacity: 0.92; }
.cap__art svg {
  width: 100%;
  height: auto;
  max-height: 250px;
  max-width: 460px;
  display: block;
  margin-inline: auto;
}

.cap-draw path, .cap-draw rect {
  stroke-dasharray: var(--len, 900);
  stroke-dashoffset: var(--len, 900);
  transition: stroke-dashoffset 1.6s var(--ease-out);
}
.cap__art.is-visible .cap-draw path,
.cap__art.is-visible .cap-draw rect { stroke-dashoffset: 0; }

.cap-pulse { animation: capPulse 3.6s ease-out infinite; transform-box: fill-box; transform-origin: center; }
@keyframes capPulse {
  0%   { transform: scale(1); opacity: 0.8; }
  70%  { transform: scale(4.5); opacity: 0; }
  100% { transform: scale(4.5); opacity: 0; }
}
.cap-dash { stroke-dasharray: 3 4; animation: rayFlow 2.2s linear infinite; }
.cap-travel { animation: capTravel 5.5s var(--ease) infinite; }
@keyframes capTravel {
  0%   { transform: translateX(0); opacity: 0; }
  8%   { opacity: 1; }
  92%  { opacity: 1; }
  100% { transform: translateX(272px); opacity: 0; }
}

.fit { margin-top: clamp(50px, 7vw, 100px); }
.fit__title {
  font-size: clamp(1.1rem, 1.5vw, 1.3rem);
  letter-spacing: -0.028em;
  color: var(--paper-dim);
  margin-bottom: clamp(20px, 2.4vw, 32px);
}
.fit__list { border-top: 1px solid var(--rule); }
.fit__list li {
  padding: clamp(20px, 2.4vw, 30px) 0;
  border-bottom: 1px solid var(--rule);
  font-size: clamp(1.02rem, 1.7vw, 1.4rem);
  letter-spacing: -0.028em;
  line-height: 1.42;
  color: var(--paper-dim);
  max-width: 58ch;
  transition: color 0.5s var(--ease), padding-left 0.6s var(--ease-out);
}
.fit__list li:hover { color: #fff; padding-left: 10px; }

/* --------------------------------------------------------------------------
   13. Chapter 06 — Trust
   -------------------------------------------------------------------------- */
.chapter--trust::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--rule-strong) 30%, var(--rule-strong) 70%, transparent);
}
.trust__head { max-width: 900px; }
.trust__head .lead { margin-top: clamp(20px, 2.4vw, 32px); }

.trust__grid {
  margin-top: clamp(64px, 8vw, 120px);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(30px, 4vw, 70px);
}
.trust__grid article { border-top: 1px solid var(--rule-strong); padding-top: clamp(22px, 2.4vw, 32px); }
.trust__num {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  color: var(--ice);
  margin-bottom: 20px;
  opacity: 0.8;
}
.trust__grid h3 { font-size: clamp(1.15rem, 1.6vw, 1.42rem); letter-spacing: -0.032em; margin-bottom: 14px; line-height: 1.2; }
.trust__grid p { color: var(--muted); font-size: 0.94rem; line-height: 1.74; }

/* --------------------------------------------------------------------------
   14. Closing
   -------------------------------------------------------------------------- */
.closing {
  position: relative;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding-block: clamp(110px, 14vw, 190px);
  background: linear-gradient(180deg, var(--ink-close) 0%, #020407 60%, #010204 100%);
  overflow: clip;
}
.closing__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}
.closing__inner {
  position: relative;
  z-index: 2;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.closing__seq {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.4vw, 18px);
  color: var(--faint);
  font-size: 0.62rem;
  letter-spacing: 0.26em;
  margin-bottom: clamp(30px, 4vw, 56px);
  flex-wrap: wrap;
  justify-content: center;
}
.closing__seq i { font-style: normal; color: var(--ice); opacity: 0.6; }
.closing__title {
  font-size: clamp(2.1rem, 6vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: -0.048em;
  font-weight: 500;
  max-width: 18ch;
}
.closing__note {
  margin-top: clamp(26px, 3vw, 40px);
  max-width: 50ch;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.76;
}
.closing__mail {
  margin-top: clamp(36px, 4.4vw, 62px);
  font-size: clamp(1.1rem, 2.4vw, 1.9rem);
  letter-spacing: -0.035em;
  color: var(--paper);
  position: relative;
  padding-bottom: 10px;
}
.closing__mail::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--rule-strong);
  transform: scaleX(1);
  transform-origin: left;
  transition: transform 0.6s var(--ease-out), background 0.5s var(--ease);
}
.closing__mail:hover::after { background: var(--ice); }

/* --------------------------------------------------------------------------
   15. Footer
   -------------------------------------------------------------------------- */
.footer {
  position: relative;
  z-index: 2;
  background: #010204;
  border-top: 1px solid var(--rule);
  padding-block: clamp(56px, 7vw, 90px) clamp(30px, 3vw, 44px);
  color: var(--muted);
}
.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(32px, 4vw, 64px);
  align-items: start;
}
.footer__tag {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--faint);
}
.footer__key { display: block; color: var(--faint); margin-bottom: 18px; }
.footer__nav, .footer__contact { display: flex; flex-direction: column; gap: 11px; align-items: flex-start; }
.footer__nav a, .footer__contact a {
  font-size: 0.9rem;
  color: var(--paper-dim);
  transition: color 0.3s var(--ease);
  position: relative;
}
.footer__nav a:hover, .footer__contact a:hover { color: #fff; }
.footer__contact a:first-of-type { color: var(--ice); }
.footer__address p { font-size: 0.9rem; line-height: 1.7; color: var(--paper-dim); }

.footer__bottom {
  margin-top: clamp(48px, 6vw, 80px);
  padding-top: 26px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--faint);
  line-height: 1.65;
}
.footer__bottom p:last-child { max-width: 64ch; text-align: right; }

/* --------------------------------------------------------------------------
   16. Reveal choreography
   -------------------------------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 1s var(--ease-out) var(--delay, 0s),
    transform 1.1s var(--ease-out) var(--delay, 0s);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

[data-reveal-lines] .ln { display: block; overflow: hidden; padding-bottom: 0.06em; }
[data-reveal-lines] .ln > span {
  display: block;
  transform: translateY(105%);
  transition: transform 1.15s var(--ease-out);
}
[data-reveal-lines] .ln:nth-child(2) > span { transition-delay: 0.09s; }
[data-reveal-lines] .ln:nth-child(3) > span { transition-delay: 0.18s; }
[data-reveal-lines].is-visible .ln > span { transform: none; }

/* --------------------------------------------------------------------------
   17. Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1180px) {
  .masthead__nav { gap: 16px; }
  .masthead__nav a { font-size: 0.8rem; }
  .masthead__cta { display: none; }
}

@media (max-width: 1020px) {
  .masthead__nav { display: none; }
  .masthead__burger { display: block; margin-left: 4px; }
  .lang-switch { margin-left: auto; }

  .mind__grid { grid-template-columns: 1fr; gap: clamp(30px, 5vw, 50px); }
  .mind__art {
    order: -1;
    margin-inline: calc(var(--gutter) * -1);
    aspect-ratio: 4 / 3;
    max-height: 62vh;
  }
  .signals { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .signals li:nth-child(odd) { padding-left: 0; border-left: 0; }
  .signals li:nth-child(n + 3) { border-top: 1px solid var(--rule); margin-top: -1px; padding-top: clamp(22px, 2.2vw, 30px); }

  .cascade li:nth-child(1) { grid-column: 1 / span 7; }
  .cascade li:nth-child(2) { grid-column: 3 / span 7; }
  .cascade li:nth-child(3) { grid-column: 4 / span 7; }
  .cascade li:nth-child(4) { grid-column: 5 / span 8; }
  .cascade li:nth-child(5) { grid-column: 6 / span 7; }

  .product__body { grid-template-columns: 1fr; }
  .dossier { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dossier > div:not(:nth-child(3n + 1)) { padding-left: 0; border-left: 0; }
  .dossier > div:nth-child(even) { padding-left: clamp(20px, 2.2vw, 34px); border-left: 1px solid var(--rule); }

  .trust__grid { grid-template-columns: 1fr; gap: 0; }
  .trust__grid article + article { margin-top: clamp(28px, 4vw, 44px); }

  .footer__top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__bottom p:last-child { text-align: left; }
}

@media (max-width: 860px) {
  .ledger__list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ledger__list li:nth-child(odd) { padding-left: 0; border-left: 0; }
  .ledger__list li:nth-child(n + 3) { border-top: 1px solid var(--rule); margin-top: -1px; padding-top: clamp(24px, 2.4vw, 34px); }

  .hero__foot { flex-direction: column; align-items: stretch; }
  .scroll-hint { display: none; }
  .spec { grid-template-columns: repeat(2, minmax(0, 1fr)); max-width: none; }

  .cap, .cap--reverse { grid-template-columns: 1fr; gap: 30px; }
  .cap--reverse .cap__text { order: 0; }
  .cap__art { max-width: 420px; }

  /* keep the knowledge field from competing with the copy on narrow screens */
  .flow__field { opacity: 0.5; }
  .flow__terms span:nth-child(n + 8) { display: none; }
}

@media (max-width: 680px) {
  :root { --chapter-y: clamp(88px, 16vw, 130px); }

  .hero { padding-top: 108px; min-height: 100svh; }
  .hero__title { max-width: 14ch; }
  html[data-lang="en"] .hero__title { max-width: 18ch; }
  .hero__actions { gap: 20px; }
  .link-cta--primary { padding: 14px 22px; width: 100%; justify-content: center; }
  .hero__actions .link-cta:not(.link-cta--primary) { align-self: center; }

  .emergence { height: 170vh; }

  /* the four-column rail becomes a stacked ledger — no dangling vertical rules */
  .spec { grid-template-columns: 1fr; border-top: 0; }
  .spec li { padding: 0; }
  .spec li + li { padding-left: 0; border-left: 0; }
  .spec li span { padding: 11px 0; border-top: 1px solid var(--rule); }
  .spec li::before { top: 0; }
  .spec li:not(:first-child)::before { display: none; }

  .signals { grid-template-columns: 1fr; }
  .signals li { padding-left: 0 !important; border-left: 0 !important; }
  .signals li + li { border-top: 1px solid var(--rule); margin-top: 0; padding-top: 24px; }
  .signals li:nth-child(n + 3) { margin-top: 0; }

  .rule-list > div { grid-template-columns: 1fr; gap: 8px; }

  .cascade { display: block; }
  .cascade li { grid-column: auto !important; padding-bottom: 30px; }

  .dossier { grid-template-columns: 1fr; }
  .dossier > div,
  .dossier > div:nth-child(even) { padding-left: 0 !important; border-left: 0 !important; padding-right: 0; }

  .vault__stage {
    min-height: 0;
    grid-template-areas: "stack" "labels";
    place-items: center stretch;
  }
  .vault__scene {
    grid-area: stack;
    justify-self: center;
    width: min(300px, 74vw);
    height: min(300px, 74vw);
  }
  .vault__labels {
    grid-area: labels;
    margin-top: 40px;
    border-top: 1px solid var(--rule);
  }
  .vault__label,
  .vault__label--a, .vault__label--b, .vault__label--c {
    position: static;
    inset: auto;
    text-align: left;
  }
  .vault__label span { padding: 15px 0; border-bottom: 1px solid var(--rule); }
  .vault__label span::after { display: none; }
  .vault__copy .lead { text-align: left; }

  /* the ingest story is inherently wide — bleed it and zoom so it stays legible */
  .product__scene {
    margin-inline: calc(var(--gutter) * -1);
    overflow: clip;
  }
  .ingest { width: 132%; margin-inline: -16%; }
  .product__scene-caption {
    font-size: 0.52rem;
    letter-spacing: 0.14em;
    padding-inline: calc(var(--gutter) * 0.5);
  }

  .footer__top { grid-template-columns: 1fr; gap: 34px; }
  .footer__bottom { flex-direction: column; gap: 10px; }
}

/* Fine-grained: keep the vault legible on very small screens */
@media (max-width: 680px) {
  .vault__perimeter { width: 460px; height: 460px; margin: -230px 0 0 -230px; transform: translateY(120px) rotateX(78deg); }
  .vault__body { width: 140px; height: 224px; margin: -112px 0 0 -70px; }
  .vault__face--front { transform: translateZ(52px); }
  .vault__face--side { width: 104px; height: 224px; margin-left: -52px; transform: rotateY(90deg) translateZ(70px); }
  .vault__face--top { width: 140px; height: 104px; margin-top: -52px; transform: rotateX(90deg) translateZ(112px); }
  .vault__seam { transform: translateZ(53px); top: 20px; bottom: 20px; }
  .vault__scan { animation-name: vaultScanSm; }
  @keyframes vaultScanSm {
    0%   { transform: translateZ(53px) translateY(4px); opacity: 0; }
    12%  { opacity: 1; }
    88%  { opacity: 1; }
    100% { transform: translateZ(53px) translateY(218px); opacity: 0; }
  }
  .vault__halo { width: 380px; height: 380px; margin: -190px 0 0 -190px; }
  .vault__scene::after {
    width: 230px; height: 84px;
    margin: -42px 0 0 -115px;
    transform: translateY(134px) rotateX(80deg);
  }
}

/* --------------------------------------------------------------------------
   18. Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  [data-reveal-lines] .ln > span { transform: none !important; }
  .emergence { height: auto; padding-block: var(--chapter-y); }
  .emergence__sticky { position: static; height: auto; }
  .emergence__inner { opacity: 1 !important; transform: none !important; }
  .grain { display: none; }
}