/* ViziaFlow page shell, hero, editorial sections and shared component styling. */

/* --concept-max/-radius/-ease-*/-shadow moved to design-tokens.css. */

html {
  scroll-behavior: smooth;
}

.concept-page {
  overflow-x: clip;
  background:
    radial-gradient(circle at 88% 8%, color-mix(in srgb, var(--coral) 8%, transparent), transparent 30rem),
    var(--paper);
  color: var(--ink);
}

/* 3D tilt + glare — vanilla, no dependency (see enhancements.js:initCardTilt).
   The rotation itself is written inline by JS on hover, not through this
   stylesheet: .concept-capability and .concept-workflow-track article
   already carry a one-shot Motion entrance transform on the same property,
   and an inline write is the only thing that can safely interrupt it
   mid-flight. This block only owns the glare overlay, which JS drives
   through --glare-*, plus the hard opt-out for touch/reduced-motion. */
[data-tilt] {
  --glare-x: 50%;
  --glare-y: 50%;
  --glare-o: 0;
  position: relative;
  /* Forces a self-contained stacking context regardless of hover state, so
     the glare (z-index: -1 below) reliably paints under this card's own
     content. Without it, an absolutely positioned pseudo-element paints
     above static in-flow children no matter what z-index it declares —
     which is exactly what was washing out the icon in .concept-why-grid
     and .concept-workflow-track (their icons aren't independently
     positioned, unlike .concept-capability's, which already had its own
     z-index and was never affected). */
  isolation: isolate;
}

[data-tilt]::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: radial-gradient(circle at var(--glare-x) var(--glare-y), rgba(255, 255, 255, var(--glare-o)), transparent 60%);
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce), (pointer: coarse) {
  [data-tilt] {
    transform: none !important;
  }
  [data-tilt]::after {
    display: none;
  }
}

/* Shared index-number badge for .concept-why-grid and .concept-workflow-track
   cards, echoing .concept-capability-index (business.css) so all three card
   families read as one system. A <b>, not a <span>: both sections already
   have generic "> span" rules for their icon chip / tag label, and a span
   here would be caught by those and rendered as a 56-64px chip instead of a
   small corner numeral. <b> matches nothing existing, so no specificity
   fight is needed. Inherits color from the card so it dims correctly on
   every themed variant instead of needing per-variant color rules. */
.concept-card-index {
  position: absolute;
  top: 18px;
  right: 20px;
  z-index: 1;
  font: var(--fw-strong) 11px/1 Arial, sans-serif;
  letter-spacing: .15em;
  opacity: .5;
  pointer-events: none;
}

.concept-file-notice {
  display: none;
}

.file-preview .concept-file-notice {
  position: relative;
  z-index: 100;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px clamp(18px, 4vw, 56px);
  color: var(--paper-bright);
  background: var(--ink);
  border-bottom: 1px solid rgb(255 255 255 / 14%);
  font-size: .78rem;
  line-height: 1.45;
}

.file-preview .concept-file-notice > i {
  flex: 0 0 auto;
  margin-top: 2px;
  color: var(--acid);
  font-size: 1.15rem;
}

.file-preview .concept-file-notice div {
  display: grid;
  gap: 2px;
}

.file-preview .concept-file-notice strong {
  font-weight: var(--fw-strong);
}

.file-preview .concept-file-notice span {
  color: rgb(250 249 245 / 72%);
}

.file-preview .concept-file-notice code {
  color: var(--acid);
  font: inherit;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: 6px;
  background: var(--acid);
  color: var(--ink);
  font-size: 13px;
  font-weight: var(--fw-label);
  transform: translateY(-160%);
  transition: transform 160ms var(--concept-ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

/* Global :focus-visible rule moved to design-tokens.css. */

.concept-page .page-progress {
  z-index: 90;
  height: 2px;
  background: transparent;
}

.concept-page .page-progress span {
  background: var(--blue);
}

.concept-page .site-header.concept-header {
  min-height: 72px;
  padding: 0 var(--pad);
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--palette-soft-ivory) 84%, transparent);
  backdrop-filter: blur(18px) saturate(145%);
  -webkit-backdrop-filter: blur(18px) saturate(145%);
  transition:
    min-height 180ms var(--concept-ease-out),
    background-color 180ms ease,
    border-color 180ms ease;
}

/* Scroll changes the surface only; visibility translates the complete header,
   so its logo and controls never resize or drift. */
.concept-page .site-header.concept-header.scrolled {
  border-color: var(--line);
  background: color-mix(in srgb, var(--palette-soft-ivory) 94%, transparent);
}

.concept-brand {
  display: inline-flex;
  align-items: center;
  min-width: max-content;
}

.concept-brand-lockup {
  display: block;
  width: 176px;
  height: auto;
  object-fit: contain;
}

.concept-footer-brand .concept-brand-lockup {
  width: 154px;
}

.concept-page .concept-nav {
  gap: clamp(18px, 2.3vw, 34px);
}

.concept-page .concept-nav a {
  position: relative;
  font-size: var(--fs-label-s);
  letter-spacing: .04em;
}

.concept-page .concept-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 180ms var(--concept-ease-out);
}

.concept-header-actions {
  gap: 10px;
}

.concept-nav-cta {
  min-height: 40px;
  border-color: var(--ink);
  border-radius: 999px;
  background: var(--ink);
  color: white;
}

.concept-menu-toggle {
  align-items: center;
  justify-content: center;
  padding: 0;
  color: white;
  cursor: pointer;
}

.concept-menu-toggle .ph {
  font-size: 19px;
}

.concept-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, .84fr) minmax(480px, 1.16fr);
  align-items: center;
  gap: clamp(38px, 5vw, 88px);
  min-height: 100dvh;
  max-width: var(--concept-max);
  margin: 0 auto;
  padding: clamp(96px, 9vw, 120px) var(--pad) 44px;
}

.concept-hero-copy {
  position: relative;
  z-index: 2;
  max-width: 650px;
}

.concept-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 24px;
  color: var(--ink-soft);
  font-size: var(--fs-label-s);
  font-weight: var(--fw-label);
  letter-spacing: .11em;
  text-transform: uppercase;
}

.concept-eyebrow .ph {
  color: var(--blue);
  font-size: 17px;
}

.concept-hero h1 {
  max-width: 600px;
  margin: 0;
  font-family: Georgia, serif;
  font-size: clamp(34px, 3.2vw, 46px);
  font-weight: 400;
  letter-spacing: -.035em;
  line-height: 1.04;
  text-wrap: balance;
}

html[lang="ru"] .concept-hero h1,
:lang(ru) .concept-hero h1 {
  font-size: clamp(30px, 2.8vw, 44px);
  letter-spacing: -.03em;
  line-height: 1.06;
}

.concept-hero h1 em {
  display: inline-block;
  padding-bottom: .05em;
  color: var(--blue);
  font-family: inherit;
  font-weight: inherit;
}

.concept-hero-lead {
  max-width: 48ch;
  margin: 26px 0 0;
  color: var(--ink-soft);
  font-size: clamp(15px, 1.3vw, 18px);
  line-height: 1.55;
  text-wrap: pretty;
}

.concept-hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 32px;
  min-height: 58px;
}

.concept-page .button {
  transition:
    transform 160ms var(--concept-ease-out),
    color 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease,
    box-shadow 180ms ease;
}

.concept-page .button:active,
.concept-page button:active {
  transform: scale(.97);
}

.concept-primary-action,
.concept-contact-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  min-height: 54px;
  min-width: 250px;
  padding: 0 22px;
  border-radius: 7px;
  background: var(--acid);
  color: var(--ink);
  box-shadow: 0 10px 30px color-mix(in srgb, var(--acid) 20%, transparent);
}

.concept-primary-action .ph,
.concept-contact-action .ph {
  font-size: 19px;
}

.concept-text-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  color: var(--ink);
  font-size: 12px;
  font-weight: var(--fw-label);
}

.concept-text-link .ph {
  font-size: 18px;
  transition: transform 180ms var(--concept-ease-out);
}

.concept-hero-visual {
  position: relative;
  isolation: isolate;
  height: clamp(430px, 48vw, 570px);
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--palette-forest-deep) 18%, transparent);
  border-radius: var(--concept-radius);
  background: var(--paper-bright);
  box-shadow: var(--concept-shadow);
}

.concept-hero-visual::after {
  content: "";
  position: absolute;
  z-index: 4;
  inset: 1px;
  border: 1px solid color-mix(in srgb, var(--palette-white) 34%, transparent);
  border-radius: calc(var(--concept-radius) - 1px);
  pointer-events: none;
}

.concept-shader-fallback,
.concept-shader-root {
  position: absolute;
  inset: 0;
}

.concept-shader-fallback {
  z-index: 0;
  background:
    radial-gradient(circle at 72% 24%, color-mix(in srgb, var(--acid) 98%, transparent), transparent 23%),
    radial-gradient(circle at 28% 76%, color-mix(in srgb, var(--coral) 82%, transparent), transparent 33%),
    radial-gradient(circle at 78% 78%, color-mix(in srgb, var(--coral) 92%, transparent), transparent 36%),
    linear-gradient(135deg, var(--blue-surface), var(--acid));
  transform: scale(1.08);
}

.concept-shader-root {
  z-index: 1;
  opacity: 0;
  transition: opacity 500ms var(--concept-ease-out);
}

.concept-shader-root.is-ready {
  opacity: 1;
}

.concept-shader-root > div,
.concept-shader-root canvas {
  width: 100% !important;
  height: 100% !important;
}

.concept-hero-mark {
  position: absolute;
  z-index: 5;
  top: 50%;
  left: 50%;
  width: clamp(170px, 20vw, 290px);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
}

.concept-hero-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 28px 32px color-mix(in srgb, var(--palette-forest-deep) 18%, transparent));
}

.concept-visual-caption {
  position: absolute;
  z-index: 6;
  right: 16px;
  bottom: 16px;
  left: 16px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid color-mix(in srgb, var(--palette-white) 38%, transparent);
  border-radius: 7px;
  background: color-mix(in srgb, var(--palette-forest-deep) 78%, transparent);
  color: white;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--palette-white) 16%, transparent);
}

.concept-visual-caption span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: var(--fs-micro);
  font-weight: var(--fw-label);
  letter-spacing: .07em;
  text-transform: uppercase;
}

.concept-visual-caption .ph {
  color: var(--acid);
  font-size: 16px;
}

.concept-section-heading {
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  gap: 28px;
  margin-bottom: clamp(46px, 6vw, 82px);
}

.concept-section-heading h2,
.concept-capabilities h2,
.concept-workflow h2,
.concept-contact h2 {
  margin: 0;
  font-family: Georgia, serif;
  font-size: clamp(44px, 6vw, 88px);
  font-weight: 400;
  letter-spacing: -.045em;
  line-height: .98;
  text-wrap: balance;
}

.concept-section-heading p,
.concept-capabilities > header p,
.concept-workflow-copy p,
.concept-contact p {
  max-width: 54ch;
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.65;
  text-wrap: pretty;
}

.concept-capabilities {
  padding-top: 40px;
}

.concept-capabilities > header {
  max-width: 900px;
  margin-bottom: clamp(44px, 6vw, 76px);
}

.concept-capabilities > header p {
  margin-top: 24px;
}

.concept-capability-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, .75fr);
  grid-template-rows: repeat(2, minmax(220px, auto));
  gap: 14px;
}

.concept-capability {
  position: relative;
  display: flex;
  justify-content: space-between;
  gap: 34px;
  overflow: hidden;
  padding: clamp(28px, 4vw, 52px);
  border-radius: var(--concept-radius);
}

.concept-capability > .ph {
  flex: 0 0 auto;
  font-size: clamp(42px, 5vw, 78px);
}

.concept-capability > div {
  align-self: end;
  max-width: 370px;
}

.concept-capability h3 {
  margin: 0;
  font-family: Georgia, serif;
  font-size: clamp(26px, 3vw, 42px);
  font-weight: 400;
  letter-spacing: -.03em;
}

.concept-capability p {
  max-width: 38ch;
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.6;
}

.concept-capability-primary {
  grid-row: 1 / -1;
  min-height: 500px;
  background: var(--blue);
  color: white;
  box-shadow: 0 24px 54px color-mix(in srgb, var(--coral) 16%, transparent);
}

.concept-capability-primary p {
  color: color-mix(in srgb, var(--palette-white) 76%, transparent);
}

.concept-capability-acid {
  background: var(--acid);
  color: var(--ink);
}

.concept-capability-outline {
  border: 1px solid color-mix(in srgb, var(--palette-forest-deep) 22%, transparent);
  background: var(--paper-bright);
}

.concept-workflow {
  display: grid;
  grid-template-columns: minmax(300px, .68fr) minmax(0, 1.32fr);
  align-items: center;
  gap: clamp(56px, 9vw, 140px);
}

.concept-workflow-copy > span {
  display: block;
  margin-bottom: 20px;
  color: var(--blue);
  font-size: var(--fs-label);
  font-weight: var(--fw-label);
}

.concept-workflow h2 {
  font-size: clamp(42px, 5vw, 72px);
}

.concept-workflow-copy p {
  margin-top: 24px;
}

.concept-workflow-track {
  position: relative;
  display: grid;
  gap: 18px;
  min-height: 480px;
  padding-left: 34px;
}

.concept-workflow-line {
  position: absolute;
  top: 48px;
  bottom: 48px;
  left: 11px;
  width: 2px;
  overflow: hidden;
  background: color-mix(in srgb, var(--palette-forest-deep) 12%, transparent);
}

.concept-workflow-line span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(var(--blue), var(--coral), var(--acid));
  transform: scaleY(0);
  transform-origin: top;
}

.concept-workflow-track article {
  position: relative;
  display: grid;
  grid-template-columns: 70px 1fr;
  grid-template-rows: auto auto;
  align-items: center;
  column-gap: 24px;
  padding: 24px 26px;
  border: 1px solid color-mix(in srgb, var(--palette-forest-deep) 18%, transparent);
  border-radius: var(--concept-radius);
  background: color-mix(in srgb, var(--palette-soft-ivory-bright) 82%, transparent);
  box-shadow: 0 16px 36px color-mix(in srgb, var(--palette-forest-deep) 6%, transparent);
  opacity: 0;
  transform: translateY(20px);
}

.concept-workflow-track article > span {
  grid-row: 1 / 3;
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border-radius: 8px;
  background: var(--paper);
}

.concept-workflow-track article:nth-of-type(2) > span {
  background: color-mix(in srgb, var(--coral) 12%, transparent);
  color: var(--blue);
}

.concept-workflow-track article:nth-of-type(3) > span {
  background: var(--acid);
}

.concept-workflow-track article .ph {
  font-size: 29px;
}

.concept-workflow-track h3 {
  align-self: end;
  margin: 0;
  font-family: Georgia, serif;
  font-size: 26px;
  font-weight: 400;
}

.concept-workflow-track p {
  align-self: start;
  margin: 5px 0 0;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.5;
}

.concept-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: clamp(44px, 9vw, 150px);
  max-width: calc(var(--concept-max) - (2 * var(--pad)));
  margin: clamp(40px, 6vw, 100px) auto;
  padding: clamp(46px, 7vw, 92px);
  border-radius: var(--concept-radius);
  background:
    radial-gradient(circle at 88% 20%, color-mix(in srgb, var(--coral) 13%, transparent), transparent 30rem),
    var(--paper-bright);
  box-shadow: var(--concept-shadow);
}

.concept-contact h2 {
  max-width: 900px;
  font-size: clamp(44px, 6.3vw, 92px);
}

.concept-contact p {
  margin-top: 24px;
  /* --ink-soft (var(--palette-forest-soft)) is a warm grey carried over from the previous
     palette; it reads fine on --paper but only 2.82:1 on this section's new
     light-blue fill, where the surrounding h2 already uses full --ink. This
     paragraph follows it — measured 8.4:1 after the change. --ink-soft is
     left alone globally: every other place it appears sits on paper. */
  color: var(--ink);
}

.concept-contact-action {
  min-width: 196px;
  white-space: nowrap;
}

/* The rule is full-bleed while the content stays on the container grid: the
   border lives on the element box, so capping that box at --concept-max
   stopped the line ~192px short of each edge. Padding does the insetting
   instead. `100%` (not 100vw) keeps the scrollbar out of the maths. */
.concept-footer {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 28px;
  padding-block: 42px;
  padding-inline: max(
    var(--pad),
    calc((100% - var(--concept-max)) / 2 + var(--pad))
  );
  border-top: 1px solid var(--line);
}

.concept-footer-brand {
  justify-self: start;
}

.concept-footer p {
  justify-self: end;
  margin: 0;
  color: var(--ink-soft);
  font-size: var(--fs-label-s);
}

.js [data-enter] {
  opacity: 0;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(26px);
}

.motion-unavailable [data-enter],
.motion-unavailable [data-reveal],
.prefers-reduced-motion [data-enter],
.prefers-reduced-motion [data-reveal] {
  opacity: 1;
  transform: none;
}

.file-preview [data-enter],
.file-preview [data-reveal],
.file-preview .concept-workflow-track article {
  opacity: 1;
  transform: none;
}

.file-preview .concept-workflow-line span {
  transform: scaleY(1);
}

/* Expressive revision: keep the original product energy and use the new
   libraries as enhancement layers around the working viewer. */
.concept-page {
  background-color: var(--paper);
  background-image: none;
}

.concept-page main {
  position: relative;
  overflow: clip;
}

.concept-page section[id] {
  scroll-margin-top: 78px;
}

.concept-page .site-header.concept-header {
  background: color-mix(in srgb, var(--palette-soft-ivory) 74%, transparent);
}

.concept-page .lang-current {
  min-height: 40px;
  border-color: color-mix(in srgb, var(--palette-forest-deep) 18%, transparent);
  background: color-mix(in srgb, var(--palette-soft-ivory-bright) 82%, transparent);
  box-shadow: 0 12px 36px color-mix(in srgb, var(--palette-forest-deep) 6%, transparent);
}

.concept-page .lang-current-caret {
  font-size: 12px;
  transition: transform 180ms var(--concept-ease-out);
}

.concept-page .lang-switch.is-open .lang-current-caret {
  transform: rotate(180deg);
}

.concept-page .lang-menu {
  border: 1px solid color-mix(in srgb, var(--palette-forest-deep) 14%, transparent);
  background: var(--paper-bright);
  box-shadow: 0 24px 80px color-mix(in srgb, var(--palette-forest-deep) 16%, transparent);
}

.concept-hero {
  min-height: 900px;
  grid-template-columns: minmax(390px, .78fr) minmax(0, 1.22fr);
  align-items: start;
  padding-top: 150px;
  padding-bottom: 110px;
}

.concept-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: 106px;
  right: -8vw;
  width: min(66vw, 980px);
  height: 720px;
  border: 1px solid color-mix(in srgb, var(--palette-forest-deep) 12%, transparent);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--palette-soft-ivory-bright) 20%, transparent), color-mix(in srgb, var(--palette-soft-ivory-bright) 0%, transparent)),
    repeating-linear-gradient(135deg, color-mix(in srgb, var(--palette-soft-ivory-bright) 18%, transparent) 0 1px, transparent 1px 18px);
  transform: rotate(-2deg);
}

.concept-hero-copy {
  position: relative;
  z-index: 6;
  max-width: 590px;
  min-height: 480px;
  padding-top: 42px;
}

.concept-hero h1 {
  max-width: 600px;
  font-size: clamp(36px, 3.2vw, 46px);
  line-height: 1.04;
  letter-spacing: -.035em;
}

html[lang="ru"] .concept-hero h1,
:lang(ru) .concept-hero h1 {
  font-size: clamp(32px, 2.9vw, 46px);
  letter-spacing: -.03em;
  line-height: 1.05;
}

.concept-hero h1 em {
  color: var(--blue);
  text-shadow: 0 10px 40px color-mix(in srgb, var(--coral) 12%, transparent);
}

.concept-hero-lead {
  max-width: 470px;
  font-size: clamp(16px, 1.35vw, 20px);
  line-height: 1.5;
}

.concept-primary-action {
  min-height: 58px;
  background: var(--ink);
  color: var(--paper-bright);
  box-shadow: 8px 8px 0 var(--acid);
}

.concept-primary-action:hover {
  background: var(--blue);
  border-color: var(--blue);
  box-shadow: 4px 4px 0 var(--acid);
}

.concept-hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin-top: 70px;
  border-top: 1px solid color-mix(in srgb, var(--palette-forest-deep) 20%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--palette-forest-deep) 20%, transparent);
  min-height: 112px;
}

.concept-hero-facts article {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 5px 10px;
  height: 112px;
  padding: 17px 16px 15px 0;
  overflow: hidden;
}

.concept-hero-facts article + article {
  padding-left: 16px;
  border-left: 1px solid color-mix(in srgb, var(--palette-forest-deep) 20%, transparent);
}

.concept-hero-facts .ph {
  grid-row: 1 / 3;
  align-self: start;
  margin-top: 3px;
  color: var(--blue);
  font-size: 22px;
}

.concept-hero-facts strong {
  font: var(--fw-strong) 10px/1 Arial, sans-serif;
  letter-spacing: .12em;
}

.concept-hero-facts span {
  font-size: var(--fs-label-s);
  font-weight: var(--fw-strong);
  line-height: 1.35;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.concept-hero-visual {
  position: relative;
  z-index: 5;
  width: 100%;
  height: clamp(520px, 44vw, 680px);
  border: 1px solid color-mix(in srgb, var(--palette-white) 15%, transparent);
  border-radius: var(--concept-radius);
  box-shadow: 0 20px 50px color-mix(in srgb, var(--palette-black) 50%, transparent);
  opacity: 1;
  pointer-events: auto;
  -webkit-mask-image: none;
  mask-image: none;
}

.concept-hero-mark {
  width: 360px;
  opacity: .09;
  filter: grayscale(1);
}

.concept-visual-caption {
  display: none;
}

.concept-capabilities {
  position: relative;
  z-index: 2;
  margin: 90px var(--pad) 0;
  padding: clamp(88px, 10vw, 150px) clamp(22px, 4vw, 64px);
  overflow: hidden;
  background:
    linear-gradient(115deg, color-mix(in srgb, var(--coral) 15%, transparent), transparent 48%),
    var(--ink);
  color: var(--paper-bright);
}

.concept-capabilities::before {
  content: "VIZIAFLOW";
  position: absolute;
  /* Was -2.5vw, which pushed the wordmark ~32px above the section and let it
     collide with the hero visual. It now starts inside its own section. */
  top: clamp(10px, 1.4vw, 28px);
  right: -1vw;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 3.5%, transparent);
  font: var(--fw-label) clamp(90px, 16vw, 250px)/1 Arial, sans-serif;
  letter-spacing: -.08em;
  pointer-events: none;
}

.concept-capabilities > header {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(160px, .34fr) minmax(0, 1fr);
  align-items: start;
  gap: 40px;
  margin-bottom: clamp(50px, 7vw, 96px);
}

.concept-capabilities > header > span {
  padding-top: 13px;
  color: var(--acid);
  font-size: var(--fs-label-s);
  font-weight: var(--fw-label);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.concept-capabilities > header h2 {
  max-width: 870px;
  font: 400 clamp(52px, 7vw, 110px)/.9 Georgia, serif;
  letter-spacing: -.065em;
}

.concept-capabilities > header h2 em {
  color: var(--acid);
}

.concept-capability-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(300px, auto));
  gap: 12px;
}

.concept-capability {
  position: relative;
  min-height: 300px;
  padding: clamp(24px, 3vw, 42px);
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 22%, transparent);
  border-radius: 4px;
}

.concept-capability > .ph {
  align-self: flex-start;
  font-size: clamp(42px, 4.5vw, 72px);
}

.concept-capability-index {
  position: absolute;
  top: 22px;
  right: 25px;
  font: var(--fw-strong) 11px/1 Arial, sans-serif;
  letter-spacing: .15em;
}

.concept-capability h3 {
  font: 400 clamp(35px, 4vw, 64px)/.95 Georgia, serif;
  letter-spacing: -.05em;
}

.concept-capability p {
  max-width: 580px;
  font-size: clamp(14px, 1.2vw, 18px);
  line-height: 1.55;
}

.concept-capability-primary {
  grid-column: 1 / 8;
  grid-row: 1;
  background: var(--paper-bright);
  color: var(--ink);
}

.concept-capability-acid {
  grid-column: 8 / 13;
  grid-row: 1;
  background: var(--acid);
  color: var(--ink);
}

.concept-capability-coral {
  grid-column: 1 / 6;
  grid-row: 2;
  background: var(--coral);
  color: var(--ink);
}

.concept-capability-blue {
  grid-column: 6 / 13;
  grid-row: 2;
  background: var(--blue-surface);
  color: white;
}

.concept-why {
  position: relative;
  display: grid;
  grid-template-columns: minmax(300px, .78fr) minmax(0, 1.22fr);
  gap: clamp(50px, 8vw, 120px);
  margin: 18px var(--pad);
  padding: clamp(92px, 11vw, 168px) clamp(24px, 5vw, 78px);
  overflow: hidden;
  background:
    radial-gradient(circle at 0 100%, color-mix(in srgb, var(--acid) 26%, transparent), transparent 34rem),
    var(--blue);
  color: white;
}

.concept-why::before {
  content: "";
  position: absolute;
  top: -180px;
  left: -140px;
  width: 420px;
  height: 420px;
  border: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 20%, transparent);
  border-radius: 50%;
  box-shadow:
    0 0 0 70px color-mix(in srgb, var(--palette-soft-ivory-bright) 4.5%, transparent),
    0 0 0 140px color-mix(in srgb, var(--palette-soft-ivory-bright) 2.5%, transparent);
}

.concept-why > header,
.concept-why-grid {
  position: relative;
  z-index: 1;
}

.concept-why > header {
  align-self: start;
}

.concept-why > header > span {
  display: inline-block;
  margin-bottom: 28px;
  color: var(--acid);
  font-size: var(--fs-label-s);
  font-weight: var(--fw-label);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.concept-why h2 {
  max-width: 760px;
  font: 400 clamp(56px, 6.5vw, 102px)/.9 Georgia, serif;
  letter-spacing: -.065em;
}

.concept-why h2 em {
  color: var(--acid);
}

.concept-why > header > p {
  max-width: 590px;
  margin-top: 38px;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 72%, transparent);
  font-size: clamp(15px, 1.25vw, 18px);
  line-height: 1.65;
}

.concept-why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 28%, transparent);
  border-left: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 28%, transparent);
}

.concept-why-grid article {
  display: flex;
  flex-direction: column;
  min-height: 330px;
  padding: clamp(24px, 3vw, 42px);
  border-right: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 28%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 28%, transparent);
}

.concept-why-grid article:nth-child(2) {
  background: color-mix(in srgb, var(--acid) 12%, transparent);
}

.concept-why-grid article:nth-child(3) {
  background: color-mix(in srgb, var(--coral) 14%, transparent);
}

.concept-why-grid article:nth-child(4) {
  background: var(--acid);
  color: var(--ink);
}

.concept-why-grid .ph {
  margin-bottom: auto;
  color: var(--acid);
  font-size: 42px;
}

.concept-why-grid article:nth-child(4) .ph {
  color: var(--blue);
}

.concept-why-grid article > span {
  margin-top: 44px;
  margin-bottom: 12px;
  font-size: var(--fs-micro);
  font-weight: var(--fw-label);
  letter-spacing: .15em;
  text-transform: uppercase;
}

.concept-why-grid h3 {
  font: 400 clamp(27px, 2.7vw, 42px)/1 Georgia, serif;
  letter-spacing: -.045em;
}

.concept-why-grid p {
  margin-top: 16px;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 68%, transparent);
  font-size: 13px;
  line-height: 1.55;
}

.concept-why-grid article:nth-child(4) p {
  color: color-mix(in srgb, var(--palette-forest-deep) 72%, transparent);
}

.concept-workflow {
  margin-top: 0;
  padding-top: clamp(100px, 12vw, 180px);
  padding-bottom: clamp(100px, 12vw, 180px);
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--coral) 16%, transparent), transparent 38%),
    var(--paper-bright);
}

.concept-workflow-copy h2 {
  font-size: clamp(50px, 6.5vw, 98px);
  line-height: .92;
}

.concept-workflow-copy h2 em {
  color: var(--blue);
}

.concept-workflow-track article {
  min-height: 160px;
  border: 1px solid color-mix(in srgb, var(--palette-forest-deep) 16%, transparent);
  border-left: 5px solid var(--blue);
  border-radius: 0;
  background: color-mix(in srgb, var(--palette-soft-ivory-bright) 78%, transparent);
}

.concept-workflow-track article:nth-of-type(2) {
  border-left-color: var(--coral);
}

.concept-workflow-track article:nth-of-type(3) {
  border-left-color: var(--acid);
  background: var(--ink);
  color: var(--paper-bright);
}

.concept-workflow-track article:nth-of-type(3) p {
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 72%, transparent);
}

.concept-workflow-track article:nth-of-type(3) > span {
  color: var(--ink);
}

.concept-contact {
  position: relative;
  margin: 18px;
  padding: clamp(54px, 8vw, 112px);
  overflow: hidden;
  background:
    radial-gradient(circle at 82% 35%, color-mix(in srgb, var(--coral) 95%, transparent), transparent 28rem),
    var(--acid);
  color: var(--ink);
}

.concept-contact::after {
  content: "";
  position: absolute;
  right: -120px;
  bottom: -180px;
  width: 440px;
  height: 440px;
  border: 75px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 16%, transparent);
  border-radius: 50%;
}

.concept-contact > div,
.concept-contact-action {
  position: relative;
  z-index: 1;
}

.concept-contact > div > span {
  display: block;
  margin-bottom: 22px;
  font-size: var(--fs-label-s);
  font-weight: var(--fw-label);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.concept-contact h2 {
  max-width: 900px;
  font-size: clamp(48px, 6.5vw, 104px);
  line-height: .9;
}

.concept-contact h2 em {
  color: var(--blue);
}

.concept-contact-action {
  min-height: 62px;
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper-bright);
}

/* Impeccable reconciliation: one rhythm, readable copy, stable surfaces. */
.concept-page .site-header.concept-header,
.concept-page .site-header.concept-header.scrolled {
  min-height: 70px;
  transform: translateY(0);
  border-bottom-color: color-mix(in srgb, var(--palette-forest-deep) 10%, transparent);
  background: color-mix(in srgb, var(--palette-soft-ivory-bright) 97%, transparent);
  box-shadow: none;
  backdrop-filter: blur(16px) saturate(125%);
  -webkit-backdrop-filter: blur(16px) saturate(125%);
  transition:
    border-color 180ms ease,
    box-shadow 180ms ease,
    transform 320ms var(--concept-ease-out);
}

.concept-page .site-header.concept-header.scrolled {
  border-bottom-color: color-mix(in srgb, var(--palette-forest-deep) 18%, transparent);
  box-shadow: 0 10px 30px color-mix(in srgb, var(--palette-forest-deep) 5.5%, transparent);
}

.concept-page .site-header.concept-header.is-hidden {
  transform: translateY(calc(-100% - 4px));
  pointer-events: none;
}

.menu-open.concept-page .site-header.concept-header.is-hidden {
  transform: translateY(0);
  pointer-events: auto;
}

.concept-page .lang-current {
  background: var(--paper-bright);
}

.concept-hero {
  box-sizing: border-box;
  min-height: clamp(760px, 100svh, 820px);
  padding-top: 118px;
  padding-bottom: 72px;
}

.concept-hero-copy {
  max-width: 560px;
  padding-top: 10px;
}

.concept-hero h1 {
  max-width: 650px;
  font-size: clamp(68px, 6.2vw, 92px);
  line-height: .9;
  letter-spacing: -.04em;
}

.concept-hero-lead {
  max-width: 45ch;
  margin-top: 22px;
  color: color-mix(in srgb, var(--palette-forest-deep) 78%, transparent);
  font-size: clamp(15px, 1.2vw, 18px);
}

.concept-hero-facts {
  margin-top: 32px;
}

.concept-hero-facts article {
  min-height: 84px;
}

.concept-hero-actions {
  margin-top: 26px;
}

.concept-hero-visual {
  /* Was 104px — a 34px band under the fixed 70px header that read as dead
     air on 1080p. Halved. */
  top: 87px;
  height: 620px;
  opacity: .55;
  border-radius: 20px;
}

.concept-visual-caption b {
  font: inherit;
}

.concept-sales-thesis {
  position: relative;
  z-index: 3;
  box-sizing: border-box;
  display: grid;
  grid-template-columns: minmax(150px, .28fr) minmax(0, 1.72fr);
  gap: clamp(36px, 6vw, 110px);
  width: min(calc(100% - (2 * var(--pad))), var(--concept-max));
  margin: 0 auto 18px;
  padding: clamp(54px, 6vw, 84px) clamp(26px, 4vw, 64px);
  border-top: 1px solid color-mix(in srgb, var(--palette-forest-deep) 20%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--palette-forest-deep) 20%, transparent);
  background:
    linear-gradient(110deg, color-mix(in srgb, var(--acid) 70%, transparent), color-mix(in srgb, var(--palette-soft-ivory-bright) 94%, transparent) 42%, color-mix(in srgb, var(--coral) 8%, transparent)),
    var(--paper-bright);
}

.concept-sales-thesis::before {
  content: "";
  position: absolute;
  top: -1px;
  left: clamp(26px, 4vw, 64px);
  width: 90px;
  height: 5px;
  background: var(--blue);
}

.concept-sales-thesis-label {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding-top: 10px;
  color: var(--blue);
  font-size: var(--fs-label-s);
  font-weight: var(--fw-label);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.concept-sales-thesis-label .ph {
  flex: 0 0 auto;
  color: var(--ink);
  font-size: 22px;
}

.concept-sales-thesis blockquote {
  margin: 0;
}

.concept-sales-thesis blockquote p {
  max-width: 1420px;
  margin: 0;
  font: 400 clamp(30px, 2.6vw, 48px)/1.04 Georgia, serif;
  letter-spacing: -.045em;
  text-wrap: pretty;
}

.concept-sales-thesis blockquote footer {
  max-width: 74ch;
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid color-mix(in srgb, var(--palette-forest-deep) 20%, transparent);
  color: color-mix(in srgb, var(--palette-forest-deep) 68%, transparent);
  font-size: var(--fs-label);
  line-height: 1.55;
}

.concept-capabilities {
  margin: clamp(72px, 8vw, 120px) var(--pad) 0;
  padding: clamp(88px, 9vw, 132px) clamp(24px, 4vw, 60px);
}

.concept-capabilities > header {
  grid-template-columns: minmax(150px, .3fr) minmax(0, 1fr);
  gap: 34px;
  margin-bottom: clamp(44px, 6vw, 76px);
}

.concept-capabilities > header h2 {
  max-width: 780px;
  font-size: clamp(52px, 6vw, 82px);
  line-height: .94;
  letter-spacing: -.04em;
}

.concept-capability-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(280px, 1fr));
  gap: 1px;
  border: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 28%, transparent);
  background: color-mix(in srgb, var(--palette-soft-ivory-bright) 28%, transparent);
}

.concept-capability,
.concept-capability-primary,
.concept-capability-acid,
.concept-capability-coral,
.concept-capability-blue {
  grid-column: auto;
  grid-row: auto;
  min-height: 280px;
  padding: clamp(26px, 3vw, 40px);
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.concept-capability {
  align-items: flex-start;
}

.concept-capability > .ph {
  font-size: clamp(42px, 4vw, 58px);
}

.concept-capability > div {
  max-width: 430px;
}

.concept-capability h3 {
  font-size: clamp(32px, 3.4vw, 48px);
  line-height: .98;
  letter-spacing: -.035em;
}

.concept-capability p {
  max-width: 44ch;
  color: color-mix(in srgb, var(--palette-forest-deep) 80%, transparent);
  font-size: 14px;
  line-height: 1.58;
}

.concept-capability-primary {
  background: var(--paper-bright);
  color: var(--ink);
}

.concept-capability-primary p {
  color: color-mix(in srgb, var(--palette-forest-deep) 80%, transparent);
}

.concept-capability-acid {
  background: var(--acid);
}

.concept-capability-coral {
  background: var(--coral);
}

.concept-capability-blue {
  background: var(--blue-surface);
  color: var(--on-blue);
}

.concept-capability-blue p {
  color: var(--on-blue);
}

.concept-why {
  grid-template-columns: minmax(400px, .94fr) minmax(560px, 1.06fr);
  align-items: start;
  gap: clamp(46px, 6vw, 92px);
  margin: 18px var(--pad);
  padding: clamp(88px, 9vw, 132px) clamp(26px, 4.5vw, 68px);
}

.concept-why h2 {
  max-width: 650px;
  font-size: clamp(50px, 4.9vw, 66px);
  line-height: .94;
  letter-spacing: -.04em;
}

.concept-why > header > p {
  max-width: 54ch;
  margin-top: 28px;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 86%, transparent);
  font-size: 16px;
  line-height: 1.65;
}

.concept-why-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-auto-rows: minmax(292px, 1fr);
}

.concept-why-grid article {
  min-height: 292px;
  padding: clamp(24px, 2.7vw, 36px);
}

.concept-why-grid .ph {
  margin-bottom: 28px;
  font-size: 38px;
}

.concept-why-grid article > span {
  margin-top: 0;
  margin-bottom: 11px;
}

.concept-why-grid h3 {
  font-size: clamp(27px, 2.35vw, 36px);
  line-height: 1.02;
  letter-spacing: -.035em;
}

.concept-why-grid p {
  margin-top: 14px;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 84%, transparent);
  font-size: 13px;
  line-height: 1.58;
}

.concept-why-grid article:nth-child(4) p {
  color: color-mix(in srgb, var(--palette-forest-deep) 80%, transparent);
}

.concept-workflow {
  grid-template-columns: minmax(330px, .82fr) minmax(540px, 1.18fr);
  align-items: start;
  gap: clamp(52px, 7vw, 104px);
  padding-top: clamp(92px, 9vw, 138px);
  padding-bottom: clamp(92px, 9vw, 138px);
}

.concept-workflow-copy h2 {
  max-width: 660px;
  font-size: clamp(50px, 5.2vw, 72px);
  line-height: .96;
  letter-spacing: -.04em;
}

.concept-workflow-copy p {
  max-width: 50ch;
  color: color-mix(in srgb, var(--palette-forest-deep) 76%, transparent);
}

.concept-workflow-plan {
  --plan-ink: var(--blue);
  --plan-accent: var(--coral);
  position: relative;
  width: min(100%, 440px);
  height: clamp(188px, 18vw, 244px);
  margin: clamp(30px, 4vw, 48px) 0 0;
  color: var(--plan-ink);
  pointer-events: none;
}

.concept-workflow-plan::before {
  position: absolute;
  inset: 4% 0 0;
  background-image:
    linear-gradient(color-mix(in srgb, currentColor 8%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, currentColor 8%, transparent) 1px, transparent 1px);
  background-size: 18px 18px;
  content: "";
  mask-image: linear-gradient(90deg, #000 62%, transparent);
}

.concept-plan-sheet {
  position: absolute;
  top: 8%;
  left: 46%;
  width: min(78%, 348px);
  aspect-ratio: 1.28;
  border: 1px solid color-mix(in srgb, currentColor 34%, transparent);
  background: color-mix(in srgb, var(--paper-bright) 78%, transparent);
  box-shadow:
    14px 14px 0 color-mix(in srgb, currentColor 5%, transparent),
    0 24px 50px color-mix(in srgb, var(--palette-forest-deep) 10%, transparent);
  transform: translateX(-50%) rotate(-4deg);
}

.concept-plan-sheet::before,
.concept-plan-sheet::after {
  position: absolute;
  content: "";
}

.concept-plan-sheet::before {
  inset: 8%;
  border: 1px solid color-mix(in srgb, currentColor 22%, transparent);
}

.concept-plan-sheet::after {
  top: 8%;
  right: 8%;
  width: 23%;
  height: 17%;
  border: 1px solid var(--plan-accent);
  background: color-mix(in srgb, var(--plan-accent) 9%, transparent);
}

.concept-plan-room {
  position: absolute;
  border: 1.5px solid currentColor;
  background: color-mix(in srgb, currentColor 4%, transparent);
}

.concept-plan-room-a {
  top: 18%;
  left: 14%;
  width: 37%;
  height: 36%;
}

.concept-plan-room-b {
  top: 54%;
  left: 14%;
  width: 37%;
  height: 29%;
}

.concept-plan-room-c {
  top: 27%;
  left: 51%;
  width: 34%;
  height: 27%;
}

.concept-plan-room-d {
  top: 54%;
  left: 51%;
  width: 34%;
  height: 29%;
  border-color: var(--plan-accent);
  background: color-mix(in srgb, var(--plan-accent) 9%, transparent);
}

.concept-plan-dimension {
  position: absolute;
  display: block;
  background: color-mix(in srgb, currentColor 55%, transparent);
}

.concept-plan-dimension::before,
.concept-plan-dimension::after {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: currentColor;
  content: "";
}

.concept-plan-dimension-x {
  right: 15%;
  bottom: 10%;
  left: 15%;
  height: 1px;
}

.concept-plan-dimension-x::before,
.concept-plan-dimension-x::after {
  top: -1.5px;
}

.concept-plan-dimension-x::before {
  left: -2px;
}

.concept-plan-dimension-x::after {
  right: -2px;
}

.concept-plan-dimension-y {
  top: 18%;
  right: 9%;
  bottom: 17%;
  width: 1px;
}

.concept-plan-dimension-y::before,
.concept-plan-dimension-y::after {
  left: -1.5px;
}

.concept-plan-dimension-y::before {
  top: -2px;
}

.concept-plan-dimension-y::after {
  bottom: -2px;
}

.concept-plan-sheet b {
  position: absolute;
  color: currentColor;
  font-family: var(--font-sans);
  font-size: 8px;
  font-weight: var(--fw-label);
  letter-spacing: .08em;
}

.concept-plan-sheet b:first-of-type {
  right: 48%;
  bottom: 5%;
}

.concept-plan-sheet b:last-of-type {
  top: 46%;
  right: 3%;
  transform: rotate(90deg);
}

.concept-plan-rise {
  position: absolute;
  right: 2%;
  bottom: 5%;
  width: 23%;
  height: 45%;
  border-right: 1px solid var(--plan-accent);
  border-bottom: 1px solid var(--plan-accent);
  transform: skewY(-18deg);
}

.concept-plan-rise i {
  position: absolute;
  right: 0;
  left: 0;
  height: 1px;
  background: color-mix(in srgb, var(--plan-accent) 66%, transparent);
}

.concept-plan-rise i:nth-child(1) {
  bottom: 25%;
}

.concept-plan-rise i:nth-child(2) {
  bottom: 50%;
}

.concept-plan-rise i:nth-child(3) {
  bottom: 75%;
}

.concept-workflow-track {
  gap: 14px;
  min-height: 0;
  padding-left: 28px;
}

.concept-workflow-line {
  left: 8px;
  width: 1px;
}

.concept-workflow-track article,
.concept-workflow-track article:nth-of-type(2),
.concept-workflow-track article:nth-of-type(3) {
  grid-template-columns: 64px 1fr;
  min-height: 150px;
  padding: 24px;
  border: 1px solid color-mix(in srgb, var(--palette-forest-deep) 16%, transparent);
  border-radius: 0;
  background: color-mix(in srgb, var(--palette-soft-ivory-bright) 92%, transparent);
  color: var(--ink);
  box-shadow: 0 12px 30px color-mix(in srgb, var(--palette-forest-deep) 5%, transparent);
}

/* Each icon chip is a tint of its own card's accent, so it separates from the
   card behind it. Card 1's chip used --paper on a near-paper card (barely a
   shape); card 3's used --acid on an acid card (no shape at all). Card 3
   inverts instead: the card is already the accent, so the chip goes dark. */
.concept-workflow-track article > span,
.concept-workflow-track article:nth-of-type(2) > span,
.concept-workflow-track article:nth-of-type(3) > span {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--blue-soft);
  color: var(--blue);
}

.concept-workflow-track article:nth-of-type(2) > span {
  background: color-mix(in srgb, var(--coral) 20%, transparent);
  color: var(--ink);
}

/* This card is acid in BOTH themes, so its chip cannot use --ink — that flips
   light in the dark theme and the circle disappears again. Fixed dark, the
   same value themes.css already uses for text on this card. */
.concept-workflow-track article:nth-of-type(3) > span {
  background: var(--ink-on-bright);
  color: var(--acid);
}

.concept-workflow-track h3 {
  font-size: clamp(24px, 2.2vw, 30px);
}

.concept-workflow-track p,
.concept-workflow-track article:nth-of-type(3) p {
  color: color-mix(in srgb, var(--palette-forest-deep) 76%, transparent);
  font-size: 13px;
  line-height: 1.55;
}

.concept-contact h2 {
  font-size: clamp(48px, 6vw, 86px);
  line-height: .94;
  letter-spacing: -.04em;
}

/* Spatial twin revision: scan frame, digital-twin story, and compact sales proof. */
@property --concept-beam-angle {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}

.concept-why {
  position: relative;
  isolation: isolate;
  display: block;
  box-sizing: border-box;
  width: min(calc(100% - (2 * var(--pad))), var(--concept-max));
  margin: 18px auto;
  padding: clamp(42px, 4.5vw, 70px);
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 12%, transparent);
  border-radius: 14px;
  background:
    radial-gradient(circle at 12% 8%, color-mix(in srgb, var(--coral) 35%, transparent), transparent 31rem),
    radial-gradient(circle at 86% 24%, color-mix(in srgb, var(--acid) 9%, transparent), transparent 26rem),
    linear-gradient(135deg, var(--palette-forest-surface) 0%, var(--palette-forest-deep) 52%, var(--palette-forest-surface) 100%);
  color: var(--paper-bright);
  box-shadow: 0 40px 110px color-mix(in srgb, var(--palette-forest-deep) 18%, transparent);
}

/* Border Beam — same mask technique as .concept-frame-beam (viewer.css),
   reusing the pattern rather than the property name so the two never fight
   over the same custom-property value. .concept-why already has
   position:relative, isolation:isolate, overflow:hidden and a border-radius
   set above, so this needs nothing extra from the section itself.
   Continuous by design (that's what a "border beam" is), which does put a
   second always-running loop on screen alongside the twin-flow node/beam
   pulse already inside this section — the SITE_README motion contract
   calls for one continuous focal system per view. Left running rather than
   decided silently: this is an explicit "let's look at it" experiment, not
   a settled choice. */
@property --why-beam-angle {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}

.concept-why::after {
  content: "";
  position: absolute;
  z-index: 5;
  inset: 0;
  padding: 2px;
  border-radius: inherit;
  background: conic-gradient(
    from var(--why-beam-angle),
    transparent 0deg 260deg,
    color-mix(in srgb, var(--acid) 16%, transparent) 278deg,
    var(--acid) 300deg,
    var(--blue) 320deg,
    transparent 344deg
  );
  pointer-events: none;
  -webkit-mask:
    linear-gradient(var(--palette-black) 0 0) content-box,
    linear-gradient(var(--palette-black) 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  animation: concept-why-beam 7s linear infinite;
}

@keyframes concept-why-beam {
  to {
    --why-beam-angle: 360deg;
  }
}

@media (prefers-reduced-motion: reduce) {
  .concept-why::after {
    animation: none;
  }
}

.concept-why::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  width: auto;
  height: auto;
  border-radius: 0;
  background-image:
    linear-gradient(color-mix(in srgb, var(--palette-soft-ivory-bright) 3.5%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--palette-soft-ivory-bright) 3.5%, transparent) 1px, transparent 1px);
  background-size: 42px 42px;
  box-shadow: none;
  opacity: .62;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, var(--palette-black), transparent 72%);
  mask-image: linear-gradient(to bottom, var(--palette-black), transparent 72%);
}

.concept-why-intro {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(360px, .86fr) minmax(520px, 1.14fr);
  align-items: center;
  gap: clamp(42px, 5.5vw, 86px);
}

.concept-why-copy {
  max-width: 650px;
}

.concept-why-copy > span {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
  color: var(--acid);
  font-size: var(--fs-label-s);
  font-weight: var(--fw-label);
  letter-spacing: .17em;
  text-transform: uppercase;
}

.concept-why-copy > span::before {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
  box-shadow: 8px 0 18px currentColor;
}

.concept-why h2 {
  max-width: 650px;
  margin: 0;
  color: var(--paper-bright);
  font: 400 clamp(48px, 4.6vw, 74px)/.94 Georgia, serif;
  letter-spacing: -.052em;
  text-wrap: balance;
}

.concept-why h2 em {
  color: var(--acid);
}

.concept-why-copy > p {
  max-width: 56ch;
  margin-top: 26px;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 76%, transparent);
  font-size: clamp(14px, 1.1vw, 17px);
  line-height: 1.62;
  text-wrap: pretty;
}

.concept-twin-flow {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 38px;
}

.concept-twin-beam {
  position: absolute;
  z-index: 0;
  top: 25px;
  right: 16.67%;
  left: 16.67%;
  height: 1px;
  overflow: hidden;
  background: color-mix(in srgb, var(--palette-soft-ivory-bright) 16%, transparent);
}

.concept-twin-beam i {
  position: absolute;
  inset: 0;
  display: block;
  background: linear-gradient(90deg, transparent, var(--acid) 42%, white 50%, var(--blue) 58%, transparent);
  filter: drop-shadow(0 0 8px color-mix(in srgb, var(--acid) 70%, transparent));
  transform: translateX(-115%);
}

.concept-twin-node {
  position: relative;
  z-index: 2;
  display: grid;
  justify-items: center;
  gap: 10px;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 76%, transparent);
  font-size: var(--fs-micro);
  font-weight: var(--fw-label);
  letter-spacing: .1em;
  text-align: center;
  text-transform: uppercase;
}

.js [data-twin-node] {
  opacity: 1;
  transform: translateY(0);
}

.concept-twin-node {
  animation: concept-twin-node-flow 4.2s cubic-bezier(.45, 0, .55, 1) infinite;
}

.concept-twin-node:nth-of-type(2) {
  animation-delay: -2.8s;
}

.concept-twin-node:nth-of-type(3) {
  animation-delay: -1.4s;
}

.concept-twin-beam i {
  animation: concept-twin-beam-flow 4.2s cubic-bezier(.45, 0, .55, 1) infinite;
}

@keyframes concept-twin-node-flow {
  0%,
  100% {
    opacity: .68;
    transform: translateY(0);
  }

  22% {
    opacity: 1;
    transform: translateY(-4px);
  }

  44% {
    opacity: .78;
    transform: translateY(0);
  }
}

@keyframes concept-twin-beam-flow {
  0% {
    transform: translateX(-115%);
  }

  22% {
    transform: translateX(-50%);
  }

  55.3% {
    transform: translateX(0%);
  }

  88.7% {
    transform: translateX(50%);
  }

  100% {
    transform: translateX(115%);
  }
}

.concept-twin-node > .ph {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 24%, transparent);
  border-radius: 8px;
  background: var(--palette-forest-surface);
  color: var(--paper-bright);
  font-size: 23px;
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--palette-forest-deep) 72%, transparent);
}

.concept-twin-node:first-of-type > .ph {
  color: var(--palette-white);
}

.concept-twin-node:nth-of-type(2) > .ph {
  border-color: color-mix(in srgb, var(--acid) 58%, transparent);
  color: var(--acid);
}

.concept-twin-node:nth-of-type(3) > .ph {
  border-color: color-mix(in srgb, var(--coral) 70%, transparent);
  color: var(--coral);
}

.concept-twin-node[data-finance-direction="positive"] > .ph {
  border-color: var(--finance-positive);
  background: var(--finance-positive);
  color: var(--on-finance-positive);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--finance-positive) 16%, transparent);
}

.concept-twin-node[data-finance-direction="positive"] > span {
  color: var(--finance-positive);
}

.concept-why-media {
  position: relative;
  margin: 0;
}

.concept-why-media-stage {
  position: relative;
  min-height: clamp(370px, 34vw, 520px);
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 20%, transparent);
  border-radius: 10px;
  background: var(--palette-forest-abyss);
  box-shadow: var(--viewer-stage-shadow);
}

.concept-twin-shader,
.concept-twin-shader-fallback {
  position: absolute;
  z-index: 0;
  inset: -20%;
  opacity: .28;
  filter: blur(26px) saturate(1.25);
  transform: scale(1.08);
}

.concept-twin-shader {
  opacity: 0;
  transition: opacity .8s ease;
}

.concept-twin-shader.is-ready {
  opacity: .3;
}

.concept-twin-shader-fallback {
  background:
    radial-gradient(circle at 20% 60%, color-mix(in srgb, var(--coral) 90%, transparent), transparent 34%),
    radial-gradient(circle at 77% 36%, color-mix(in srgb, var(--acid) 52%, transparent), transparent 28%),
    radial-gradient(circle at 64% 78%, color-mix(in srgb, var(--coral) 40%, transparent), transparent 25%);
}

.concept-why-media-stage > img {
  position: absolute;
  z-index: 1;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: .96;
  filter: contrast(1.06) saturate(.96);
  backface-visibility: hidden;
}

.concept-scan-mesh {
  position: absolute;
  z-index: 2;
  inset: 0;
  background-image:
    linear-gradient(color-mix(in srgb, var(--acid) 11%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--acid) 11%, transparent) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: .32;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(90deg, var(--palette-black) 0%, color-mix(in srgb, var(--palette-black) 60%, transparent) 42%, transparent 67%);
  mask-image: linear-gradient(90deg, var(--palette-black) 0%, color-mix(in srgb, var(--palette-black) 60%, transparent) 42%, transparent 67%);
}

.concept-scan-sweep {
  position: absolute;
  z-index: 3;
  top: -8%;
  right: 0;
  left: 0;
  height: 16%;
  background: linear-gradient(to bottom, transparent, color-mix(in srgb, var(--acid) 16%, transparent), color-mix(in srgb, var(--acid) 92%, transparent));
  border-bottom: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 94%, transparent);
  filter: drop-shadow(0 0 12px color-mix(in srgb, var(--acid) 56%, transparent));
  transform: translateY(-120%);
  pointer-events: none;
}

.motion-unavailable .concept-twin-beam i {
  transform: translateX(0);
}

.motion-unavailable .concept-scan-sweep {
  transform: translateY(280%);
}

.concept-media-label {
  position: absolute;
  z-index: 7;
  right: 18px;
  bottom: 18px;
  padding: 8px 10px;
  border: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 28%, transparent);
  border-radius: 6px;
  background: color-mix(in srgb, var(--palette-forest-abyss) 80%, transparent);
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 82%, transparent);
  font-size: var(--fs-micro);
  font-weight: var(--fw-label);
  letter-spacing: .12em;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
}

.concept-why-media figcaption {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 68ch;
  margin-top: 14px;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 58%, transparent);
  font-size: var(--fs-label);
  line-height: 1.5;
}

.concept-why-media figcaption::before {
  content: "01";
  color: var(--acid);
  font-weight: var(--fw-label);
  letter-spacing: .12em;
}

/* Acid reads on the dark theme's paper but is near-invisible on the light
   one (1.2:1 against --paper). The caption sits on the page background, not
   on the dark media stage, so it needs the theme-aware accent. */
html[data-theme="light"] .concept-why-media figcaption::before {
  color: var(--blue);
}

.concept-why-quote {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr) minmax(180px, .3fr);
  align-items: start;
  gap: clamp(22px, 3vw, 48px);
  margin: clamp(42px, 5vw, 74px) 0 0;
  padding: clamp(26px, 3.2vw, 46px);
  border: 1px solid color-mix(in srgb, var(--palette-soft-ivory-bright) 18%, transparent);
  border-radius: 10px;
  background:
    linear-gradient(110deg, color-mix(in srgb, var(--coral) 18%, transparent), color-mix(in srgb, var(--palette-soft-ivory-bright) 3.5%, transparent) 48%, color-mix(in srgb, var(--acid) 8%, transparent));
}

.concept-why-quote > .ph {
  color: var(--acid);
  font-size: 42px;
}

.concept-why-quote p {
  margin: 0;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 78%, transparent);
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 1.65;
  text-wrap: pretty;
}

.concept-why-quote strong {
  display: block;
  margin-bottom: 13px;
  color: var(--paper-bright);
  font: 400 clamp(26px, 2.3vw, 38px)/1.06 Georgia, serif;
  letter-spacing: -.035em;
}

.concept-why-quote footer {
  margin: 3px 0 0;
  padding-left: 18px;
  border-left: 1px solid color-mix(in srgb, var(--acid) 45%, transparent);
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 56%, transparent);
  font-size: var(--fs-label-s);
  line-height: 1.55;
}

.concept-why-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-auto-rows: auto;
  gap: 1px;
  margin-top: 1px;
  border: 0;
  border-radius: 12px;
  background: color-mix(in srgb, var(--palette-soft-ivory-bright) 17%, transparent);
  overflow: hidden;
}

/* See the matching note in themes.css: fills come from palette tokens so no
   card carries a literal colour. Card 04 uses the --blue-surface/--on-blue
   pair rather than --blue, because it is a filled panel carrying text — the
   distinction design-tokens.css documents. */
.concept-why-grid article,
.concept-why-grid article:nth-child(2),
.concept-why-grid article:nth-child(3),
.concept-why-grid article:nth-child(4) {
  min-height: 225px;
  padding: clamp(22px, 2.2vw, 32px);
  border: 0;
  background: var(--paper-bright);
  color: var(--ink);
}

.concept-why-grid article:nth-child(2) {
  background: color-mix(in srgb, var(--acid) 14%, var(--paper-bright));
}

.concept-why-grid article:nth-child(3) {
  background: color-mix(in srgb, var(--coral) 14%, var(--paper-bright));
}

.concept-why-grid article:nth-child(4) {
  background: var(--blue-surface);
  color: var(--on-blue);
}

.concept-why-grid .ph,
.concept-why-grid article:nth-child(4) .ph {
  margin-bottom: 30px;
  color: var(--acid);
  font-size: 30px;
}

.concept-why-grid article > span {
  margin: 0 0 10px;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 58%, transparent);
  font-size: var(--fs-micro);
}

.concept-why-grid h3 {
  font-size: clamp(22px, 1.8vw, 30px);
  line-height: 1.03;
}

.concept-why-grid p,
.concept-why-grid article:nth-child(4) p {
  margin-top: 12px;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 74%, transparent);
  font-size: 12px;
  line-height: 1.55;
}

/* Final concept geometry: wider 2K canvas and one coherent radius system. */
.concept-capabilities {
  overflow: hidden;
  border-radius: 14px;
}

.concept-capability-grid {
  overflow: hidden;
  border-radius: 12px;
}

.concept-why-media-stage,
.concept-why-quote,
.concept-workflow-track article,
.concept-contact {
  border-radius: 12px;
}

/* ─── Theme toggle ─── */
.theme-toggle {
  position: relative;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface-glass, color-mix(in srgb, var(--palette-soft-ivory-bright) 82%, transparent));
  color: var(--ink);
  cursor: pointer;
  overflow: hidden;
  transition:
    border-color 200ms ease,
    background-color 200ms ease,
    transform 200ms var(--concept-ease-out);
}

.theme-toggle:hover {
  border-color: var(--ink);
  transform: scale(1.06);
}

.theme-toggle:active {
  transform: scale(.94);
}

.theme-toggle .ph {
  position: absolute;
  font-size: 18px;
  transition:
    transform 400ms var(--concept-ease-out),
    opacity 200ms ease;
}

/* ─── Theme-aware official lockup switching ─── */
.brand-lockup-reverse {
  display: none !important;
}

.concept-page .lang-current,
.concept-page .theme-toggle,
.concept-page .concept-nav-cta,
.concept-page .concept-menu-toggle {
  min-height: 44px;
}

.concept-page .lang-current {
  min-width: 86px;
  padding-right: 13px;
  padding-left: 13px;
}

.concept-page .theme-toggle,
.concept-page .concept-menu-toggle {
  width: 44px;
  height: 44px;
}

.concept-page .concept-nav-cta {
  padding-right: 20px;
  padding-left: 20px;
}

.concept-why-quote #sales-thesis-title {
  font-size: clamp(15px, 1.2vw, 18px);
  font-weight: 400;
  line-height: 1.65;
}

.concept-workflow-track {
  box-sizing: border-box;
}

.concept-back-to-top {
  position: fixed;
  z-index: 82;
  right: clamp(16px, 2vw, 28px);
  bottom: clamp(16px, 2vw, 28px);
  display: grid;
  place-items: center;
  width: 72px;
  height: 72px;
  padding: 0;
  border: 1px solid color-mix(in srgb, var(--palette-forest-deep) 18%, transparent);
  border-radius: 50%;
  background: color-mix(in srgb, var(--palette-soft-ivory-bright) 92%, transparent);
  color: var(--ink);
  box-shadow: 0 14px 38px color-mix(in srgb, var(--palette-forest-deep) 18%, transparent);
  opacity: 0;
  cursor: pointer;
  pointer-events: none;
  transform: translateY(12px) scale(.92);
  transition:
    opacity 180ms ease,
    transform 260ms var(--concept-ease-out),
    color 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease;
  backdrop-filter: blur(14px);
}

.concept-back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.concept-back-to-top:hover {
  border-color: var(--blue);
  background: var(--blue);
  color: var(--palette-soft-ivory-bright);
  transform: translateY(-2px) scale(1);
}

.concept-back-to-top:active {
  transform: translateY(0) scale(.96);
}

.concept-back-to-top > span {
  font-family: Arial, sans-serif;
  font-size: 48px;
  font-weight: 400;
  line-height: 1;
  transform: translateY(-1px);
}

/* Business case: compact investor logic inside the existing editorial grid. */
.concept-capabilities > header > p {
  grid-column: 2;
  max-width: 66ch;
  margin-top: -12px;
}

.concept-capability-grid {
  grid-template-rows: repeat(2, minmax(340px, 1fr));
}

.concept-capability > div:not(.concept-capability-index) {
  position: relative;
  z-index: 2;
  flex: 0 1 45%;
  max-width: 470px;
  margin-left: auto;
}

.concept-capability > .ph,
.concept-capability-index {
  z-index: 3;
}

.concept-business-visual {
  position: absolute;
  z-index: 1;
  top: 54px;
  bottom: 12px;
  left: 3.5%;
  display: grid;
  place-items: center;
  width: 48%;
  margin: 0;
  pointer-events: none;
}

/* `place-items: center` leaves the single grid row content-sized, so a
   percentage height on the image is cyclic and falls back to `auto` — at
   which point the width/height attributes' aspect ratio drove the height
   (496px wide / 1.5 = 331px) inside a 224px box, overflowing the card by
   ~102px and getting clipped by `overflow: hidden`. Pinning the row to
   `minmax(0, 1fr)` makes it definite, so `height: 100%` resolves and
   `object-fit: contain` scales the artwork down to fit instead of spilling. */
.concept-business-visual {
  grid-template-rows: minmax(0, 1fr);
  grid-template-columns: minmax(0, 1fr);
}

.concept-business-visual img {
  display: block;
  width: 100%;
  height: 100%;
  max-height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 18px 18px color-mix(in srgb, var(--palette-forest-deep) 16%, transparent));
}

.concept-capability-blue .concept-business-visual img {
  filter: drop-shadow(0 18px 20px color-mix(in srgb, var(--palette-black) 28%, transparent));
}

.concept-business-metric,
.concept-business-metric-label {
  display: block;
}

.concept-business-metric {
  margin-bottom: 5px;
  font: var(--fw-strong) clamp(34px, 3.2vw, 52px)/.95 Arial, sans-serif;
  letter-spacing: -.055em;
  font-variant-numeric: tabular-nums;
  text-wrap: balance;
}

.concept-business-metric-word {
  font-family: Georgia, serif;
  font-style: italic;
  font-weight: 400;
}

.concept-business-metric-label {
  min-height: 2.8em;
  margin-bottom: 18px;
  font-size: var(--fs-label-s);
  font-weight: var(--fw-label);
  line-height: 1.4;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.concept-capabilities .concept-capability h3 {
  font-size: clamp(28px, 2.8vw, 42px);
}

.concept-business-note {
  /* Was 86ch, which ran to ~96 characters per line at this size — the worst
     measure on the page, and at the smallest body size. */
  max-width: var(--measure);
  margin: 22px 0 0 auto;
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 88%, transparent);
  font-size: var(--fs-label-s);
  line-height: 1.55;
  text-align: right;
}

/* Label alpha raised from .64/.72: at 10px these are small text and owe
   4.5:1, which the old values missed on every card colour. */
.concept-capability-primary .concept-business-metric-label,
.concept-capability-coral .concept-business-metric-label,
.concept-capability-acid .concept-business-metric-label {
  color: color-mix(in srgb, var(--palette-forest-deep) 82%, transparent);
}

.concept-capability-blue .concept-business-metric-label {
  color: var(--on-blue);
}

/* Progressive FAQ: native disclosure, no JavaScript dependency. */
.concept-faq {
  box-sizing: border-box;
  display: grid;
  grid-template-columns: minmax(260px, .54fr) minmax(0, 1.46fr);
  gap: clamp(48px, 7vw, 120px);
  width: min(calc(100% - (2 * var(--pad))), var(--concept-max));
  margin: clamp(70px, 8vw, 128px) auto clamp(90px, 10vw, 160px);
  padding: clamp(42px, 5vw, 72px) 0 0;
  border-top: 1px solid var(--line);
}

.concept-faq-intro {
  align-self: start;
  position: sticky;
  top: 118px;
}

.concept-faq-intro > span {
  display: block;
  margin-bottom: 26px;
  color: var(--blue);
  font-size: var(--fs-label-s);
  font-weight: var(--fw-label);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.concept-faq-intro h2 {
  max-width: 560px;
  margin: 0;
  color: var(--ink);
  font: 400 clamp(42px, 4.6vw, 72px)/.92 Georgia, serif;
  letter-spacing: -.055em;
}

.concept-faq-intro h2 em {
  color: var(--blue);
  font-weight: 400;
}

.concept-faq-intro p {
  max-width: 43ch;
  margin: 26px 0 0;
  color: var(--ink-soft);
  font-size: var(--fs-body-s);
  line-height: 1.65;
}

.concept-faq-list {
  border-top: 1px solid var(--line);
}

.concept-faq-list details {
  border-bottom: 1px solid var(--line);
}

.concept-faq-list summary {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 14px;
  min-height: 74px;
  padding: 4px 0;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

.concept-faq-list summary::-webkit-details-marker {
  display: none;
}

.concept-faq-list summary > span {
  color: var(--blue);
  font-size: var(--fs-micro);
  font-weight: var(--fw-label);
  letter-spacing: .12em;
}

.concept-faq-list summary strong {
  font: 400 clamp(20px, 1.7vw, 28px)/1.12 Georgia, serif;
  letter-spacing: -.025em;
}

.concept-faq-list summary > .ph {
  justify-self: end;
  font-size: 22px;
  transition: transform 180ms ease, color 180ms ease;
}

.concept-faq-list details[open] summary > .ph {
  color: var(--blue);
  transform: rotate(45deg);
}

.concept-faq-list details > p {
  max-width: var(--measure);
  margin: 0;
  padding: 0 48px 26px 56px;
  color: var(--ink-soft);
  font-size: var(--fs-body-s);
  line-height: 1.7;
  text-wrap: pretty;
}

.concept-faq-list summary:hover strong,
.concept-faq-list summary:focus-visible strong {
  color: var(--blue);
}

.concept-faq-list summary:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 6px;
}

/* Hero thesis: keep the promise readable while the Viewer owns the right side. */
.concept-hero h1 {
  max-width: 11.5ch;
  font-size: clamp(48px, 5vw, 72px);
  line-height: .93;
  letter-spacing: -.045em;
}

.concept-hero-lead {
  max-width: 54ch;
}

.concept-why-grid {
  margin-top: clamp(42px, 5vw, 74px);
}

/* ==========================================================================
   Cinematic digital-twin hero
   --------------------------------------------------------------------------
   One authored spectacle: the captured apartment floats inside a restrained
   WebGL atmosphere. The composition stays bounded, the object stays fully in
   frame, and the surrounding UI remains deliberately quiet.
   ========================================================================== */

.concept-hero {
  grid-template-columns: minmax(430px, 620px) minmax(520px, 1120px);
  align-items: center;
  justify-content: space-between;
  gap: clamp(48px, 5vw, 100px);
  /* Includes the existing horizontal padding; the inner grid remains 1840px. */
  width: min(100%, 1968px);
  min-height: clamp(720px, 100svh, 860px);
  padding-top: 112px;
  padding-bottom: 72px;
}

.concept-hero::before {
  display: none;
}

.concept-hero-copy {
  max-width: 620px;
  min-height: 0;
  padding-top: 0;
}

.concept-hero h1 {
  max-width: 14ch;
  font-size: clamp(46px, 4vw, 66px);
  line-height: .96;
  letter-spacing: -.035em;
}

html[lang="ru"] .concept-hero h1,
:lang(ru) .concept-hero h1 {
  font-size: clamp(44px, 3.4vw, 54px);
  line-height: .98;
  letter-spacing: -.03em;
}

.concept-hero h1 em {
  display: block;
  margin-top: .18em;
  color: var(--ink-soft);
  font-size: .72em;
  font-style: normal;
  line-height: 1.05;
  letter-spacing: -.025em;
  text-shadow: none;
}

.concept-hero-lead {
  max-width: 62ch;
  margin-top: 24px;
  font-size: clamp(15px, 1.1vw, 18px);
  line-height: 1.58;
}

.concept-hero-actions {
  margin-top: 30px;
}

.concept-primary-action {
  min-height: 54px;
  border-radius: 2px;
  background: var(--ink);
  color: var(--paper-bright);
  box-shadow: none;
  transition:
    color 180ms var(--concept-ease-out),
    background 180ms var(--concept-ease-out),
    border-color 180ms var(--concept-ease-out),
    transform 180ms var(--concept-ease-out);
}

.concept-primary-action:hover {
  border-color: var(--blue);
  background: var(--blue);
  box-shadow: none;
  transform: translateY(-2px);
}

.concept-hero-facts {
  min-height: 0;
  margin-top: 38px;
  border-top-color: var(--line);
  border-bottom: 0;
}

.concept-hero-facts article {
  align-items: center;
  min-height: 76px;
  height: auto;
  padding: 16px 16px 14px 0;
}

.concept-hero-facts article + article {
  border-left-color: var(--line);
}

.concept-hero-facts strong {
  display: none;
}

.concept-hero-facts .ph {
  grid-row: auto;
  align-self: center;
  margin-top: 0;
  color: var(--blue);
  font-size: 19px;
}

.concept-hero-facts span {
  letter-spacing: .045em;
}

.concept-hero-visual {
  --scan-scale: .94;
  top: 0;
  isolation: isolate;
  justify-self: end;
  width: 100%;
  max-width: 1120px;
  height: clamp(560px, 42vw, 720px);
  overflow: hidden;
  border: 0;
  border-radius: 16px;
  background:
    radial-gradient(circle at 20% 24%, color-mix(in srgb, var(--coral) 18%, transparent), transparent 38%),
    radial-gradient(circle at 82% 78%, color-mix(in srgb, var(--acid) 9%, transparent), transparent 32%),
    var(--palette-forest-deep);
  box-shadow:
    inset 0 0 0 1px color-mix(in srgb, var(--acid) 20%, transparent),
    0 38px 90px -48px color-mix(in srgb, var(--palette-terracotta) 74%, transparent);
  opacity: 1;
  pointer-events: auto;
}

.concept-hero-visual::after {
  content: "";
  position: absolute;
  z-index: 6;
  inset: 0;
  padding: 1px;
  border-radius: inherit;
  background:
    linear-gradient(125deg, color-mix(in srgb, var(--acid) 64%, transparent), transparent 18%, transparent 76%, color-mix(in srgb, var(--acid) 72%, transparent));
  -webkit-mask:
    linear-gradient(var(--palette-black) 0 0) content-box,
    linear-gradient(var(--palette-black) 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: .78;
  pointer-events: none;
}

.concept-hero-visual .concept-shader-fallback,
.concept-hero-visual .concept-shader-root {
  position: absolute;
  z-index: 0;
  inset: -18%;
  filter: blur(34px) saturate(.9);
  transform: scale(1.08);
  -webkit-mask-image: radial-gradient(ellipse at 50% 48%, var(--palette-black) 0 46%, color-mix(in srgb, var(--palette-black) 72%, transparent) 60%, transparent 79%);
  mask-image: radial-gradient(ellipse at 50% 48%, var(--palette-black) 0 46%, color-mix(in srgb, var(--palette-black) 72%, transparent) 60%, transparent 79%);
  pointer-events: none;
}

.concept-hero-visual .concept-shader-fallback {
  background:
    radial-gradient(ellipse at 24% 68%, color-mix(in srgb, var(--coral) 92%, transparent), transparent 42%),
    radial-gradient(ellipse at 76% 24%, color-mix(in srgb, var(--acid) 52%, transparent), transparent 34%),
    radial-gradient(ellipse at 64% 78%, color-mix(in srgb, var(--palette-terracotta) 66%, transparent), transparent 40%);
  opacity: .72;
}

.concept-hero-visual .concept-shader-root {
  opacity: 0;
  transition: opacity 900ms var(--concept-ease-out);
}

.concept-hero-visual .concept-shader-root.is-ready {
  opacity: .42;
}

.concept-hero-visual .concept-shader-root > div,
.concept-hero-visual .concept-shader-root canvas {
  width: 100% !important;
  height: 100% !important;
}

.concept-capabilities {
  margin-top: 0;
  border-right: 0;
  border-radius: 0;
  border-left: 0;
  background: var(--palette-forest-deep);
}

.concept-capabilities::before {
  display: none;
}

.concept-capabilities > header h2 {
  max-width: 16ch;
  letter-spacing: -.035em;
}

.concept-capabilities > header h2 em {
  color: color-mix(in srgb, var(--palette-soft-ivory-bright) 72%, transparent);
  font-style: normal;
}