/* ARCELL V4 — editorial-scale scientific presentation. Loaded after the V3 styles. */
:root {
  --v4-midnight: #06172b;
  --v4-deep: #0a223d;
  --v4-blue: #123f72;
  --v4-teal: #16a6a2;
  --v4-cyan: #77e2dc;
  --v4-fog: #eef3f7;
  --v4-rule: #d5e0e9;
}
body[data-version="v4"] {
  color: #102f50;
  background: #fff;
  letter-spacing: -.005em;
}
body[data-version="v4"] .container { width: min(1360px, calc(100% - 112px)); }
body[data-version="v4"] .section { padding-block: clamp(88px, 8vw, 128px); }
body[data-version="v4"] h2 { font-size: clamp(38px, 4.2vw, 60px); line-height: 1.22; letter-spacing: -.045em; }
body[data-version="v4"] h3 { letter-spacing: -.03em; }
body[data-version="v4"] .eyebrow { letter-spacing: .19em; font-size: 11px; }
body[data-version="v4"] .button { border-radius: 3px; padding-inline: 26px; }
body[data-version="v4"] .text-link { text-underline-offset: 6px; }

/* Quiet, precise site chrome. */
body[data-version="v4"] .site-header {
  background: rgba(255,255,255,.93);
  border-bottom-color: rgba(193,210,223,.72);
  backdrop-filter: blur(20px) saturate(150%);
  transition: box-shadow .25s ease, background .25s ease;
}
body[data-version="v4"] .site-header.is-scrolled { box-shadow: 0 13px 36px rgba(6,23,43,.08); background: rgba(255,255,255,.98); }
body[data-version="v4"] .header-inner { min-height: 78px; width: min(1440px, calc(100% - 64px)); }
body[data-version="v4"] .brand { flex-basis: 140px; }
body[data-version="v4"] .brand img { width: 140px; }
body[data-version="v4"] .main-nav > a { font-size: 12px; letter-spacing: .015em; padding-block: 25px; }
body[data-version="v4"] .main-nav > a[aria-current]::after { bottom: 15px; }
body[data-version="v4"] .header-cta { border-radius: 2px; padding: 11px 18px; background: var(--v4-midnight); }

/* Cinematic, full-width home hero using ARCELL's existing concept visual. */
.v4-home-hero {
  position: relative;
  isolation: isolate;
  min-height: calc(100svh - 78px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--v4-midnight);
  color: #fff;
}
.v4-hero-media { position: absolute; inset: 0; z-index: -2; overflow: hidden; }
.v4-hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: 58% center; transform: scale(1.015); }
.v4-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(4,18,35,.98) 0%, rgba(4,18,35,.91) 29%, rgba(4,18,35,.34) 60%, rgba(4,18,35,.13) 100%),
    linear-gradient(0deg, rgba(4,18,35,.96) 0%, transparent 42%),
    radial-gradient(circle at 75% 45%, transparent 0%, rgba(2,13,28,.18) 70%);
}
.v4-home-hero .hero-grid {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0,1.25fr) minmax(250px,.55fr);
  align-items: center;
  gap: clamp(50px, 8vw, 130px);
  padding-block: clamp(78px, 10vh, 126px) clamp(54px, 7vh, 84px);
}
.v4-home-hero .hero-copy { max-width: 780px; }
.v4-home-hero .hero-copy .eyebrow { color: #a9e7e4; margin-bottom: 27px; }
.v4-home-hero .live-dot { background: var(--v4-cyan); box-shadow: 0 0 0 6px rgba(119,226,220,.1); }
.v4-home-hero .hero-copy h1 {
  color: #fff;
  font-size: clamp(57px, 6.45vw, 96px);
  font-weight: 720;
  line-height: 1.06;
  letter-spacing: -.065em;
  text-wrap: balance;
}
.v4-home-hero .hero-copy h1 em { color: var(--v4-cyan); }
.v4-home-hero .hero-lead { max-width: 640px; margin-top: 31px; color: rgba(228,239,249,.8); font-size: clamp(16px, 1.25vw, 19px); line-height: 1.9; }
.v4-home-hero .hero-actions { margin-top: 34px; }
.v4-home-hero .button.primary { background: #f2fffd; color: var(--v4-midnight); box-shadow: none; }
.v4-home-hero .button.primary:hover { background: var(--v4-cyan); }
.v4-home-hero .button.outline { color: #fff; background: rgba(255,255,255,.04); border-color: rgba(219,237,248,.38); }
.v4-home-hero .button.outline:hover { background: rgba(255,255,255,.11); border-color: rgba(255,255,255,.8); }
.v4-home-hero .hero-footnote { color: rgba(229,241,249,.83); margin-top: 33px; }
.v4-home-hero .hero-footnote i, .v4-home-hero .hero-footnote small { color: rgba(197,219,234,.61); }
.v4-hero-lenses {
  width: min(100%, 340px);
  justify-self: end;
  align-self: end;
  margin: 0 0 8px;
  padding: 25px 28px 17px;
  background: rgba(5,24,44,.48);
  border: 1px solid rgba(190,226,239,.25);
  backdrop-filter: blur(18px);
}
.v4-hero-lenses > p { color: var(--v4-cyan); font-size: 9px; letter-spacing: .21em; font-weight: 750; }
.v4-hero-lenses ol { list-style: none; padding: 0; margin: 18px 0 0; }
.v4-hero-lenses li { display: grid; grid-template-columns: 32px 1fr; gap: 16px; align-items: center; padding: 14px 0; border-top: 1px solid rgba(214,234,246,.18); }
.v4-hero-lenses li > span { color: rgba(178,211,229,.66); font-size: 10px; }
.v4-hero-lenses small { display: block; color: rgba(185,217,233,.68); font-size: 8px; letter-spacing: .17em; }
.v4-hero-lenses b { display: block; margin-top: 3px; color: #fff; font-size: 15px; font-weight: 620; }
.v4-hero-dock { position: relative; z-index: 1; display: grid; grid-template-columns: .7fr 1.3fr; gap: 55px; align-items: center; border-top: 1px solid rgba(214,234,246,.23); padding-block: 23px 30px; }
.v4-hero-dock > p { color: rgba(218,235,246,.72); font-size: 12px; line-height: 1.7; }
.v4-hero-dock > p span { display: block; margin-bottom: 4px; color: var(--v4-cyan); font-size: 8px; letter-spacing: .18em; font-weight: 750; }
.v4-sample-lanes { display: grid; grid-template-columns: 1fr 1fr; gap: 0 34px; padding: 0; background: transparent; }
.v4-sample-lanes > a { border-top: 0; border-left: 1px solid rgba(214,234,246,.2); padding: 4px 0 4px 23px; }
.v4-sample-lanes > a + a { margin-top: 0; }
.v4-sample-lanes > a:hover b { color: var(--v4-cyan); }
.v4-home-hero > .visual-caption { right: 18px; bottom: 8px; color: rgba(224,239,247,.55); }
.v4-proof-band { background: #fff; border-bottom: 1px solid var(--v4-rule); }
.v4-proof-band .proof-strip { border-top: 0; padding-block: 34px 37px; }
.v4-proof-band .proof-label p { margin-top: 7px; font-size: 12px; color: #607991; }
.v4-proof-band .proof-strip strong { font-size: clamp(32px, 3vw, 43px); color: var(--v4-midnight); }
.v4-proof-band .proof-strip > a { transition: color .2s ease; }
.v4-proof-band .proof-strip > a:hover { color: var(--v4-teal); }

/* V4 section headlines align like an editorial feature, not a sales-card grid. */
.v4-section-head { display: grid; grid-template-columns: minmax(0,1.15fr) minmax(280px,.62fr); gap: clamp(50px, 8vw, 130px); align-items: end; margin-bottom: clamp(46px, 5vw, 74px); }
.v4-section-head > p { color: #5b7288; font-size: 16px; line-height: 1.95; max-width: 520px; }

/* One research continuum. */
.v4-continuum { position: relative; overflow: hidden; background: var(--v4-midnight); color: #fff; }
.v4-continuum::before { content: ""; position: absolute; width: 620px; height: 620px; border-radius: 50%; top: -360px; right: -130px; background: rgba(28,183,179,.13); filter: blur(55px); pointer-events: none; }
.v4-continuum .v4-section-head > p { color: #aebfd0; }
.v4-continuum .eyebrow, .v4-continuum h2 em { color: var(--v4-cyan); }
.continuum-stage { position: relative; min-height: 610px; overflow: hidden; border: 1px solid rgba(207,232,242,.18); background: #cfd8e0; }
.continuum-media { position: absolute; inset: 0; }
.continuum-media img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.continuum-media::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(3,18,34,.97) 0%, rgba(3,18,34,.55) 39%, rgba(3,18,34,.03) 76%), linear-gradient(90deg, rgba(3,18,34,.21), transparent 52%); }
.continuum-media > span { position: absolute; z-index: 1; top: 18px; right: 20px; color: #546e83; background: rgba(255,255,255,.76); padding: 5px 8px; font-size: 8px; letter-spacing: .07em; }
.continuum-track { position: relative; z-index: 1; min-height: 610px; display: grid; grid-template-columns: repeat(4,1fr); align-items: end; gap: 1px; list-style: none; margin: 0; padding: 0 22px 25px; }
.continuum-track li { min-height: 220px; padding: 24px 24px 21px; border-top: 2px solid rgba(119,226,220,.72); background: rgba(5,25,46,.73); backdrop-filter: blur(12px); }
.continuum-track li > span { color: var(--v4-cyan); font-size: 10px; letter-spacing: .12em; }
.continuum-track h3 { margin-top: 17px; font-size: 21px; color: #fff; }
.continuum-track p { margin-top: 13px; color: rgba(212,229,239,.72); font-size: 13px; line-height: 1.85; }
.continuum-note { margin-top: 20px; color: #8fa7b9; font-size: 12px; }

/* Existing technology and evidence content receives a more architectural frame. */
body[data-version="v4"] #core-technology .tech-grid { gap: 1px; border-block: 1px solid var(--v4-rule); background: var(--v4-rule); }
body[data-version="v4"] #core-technology .tech-card { border: 0; border-radius: 0; min-height: 440px; grid-template-columns: minmax(0,1fr) 165px; box-shadow: none; background: #fff; }
body[data-version="v4"] #core-technology .tech-card:hover { transform: none; box-shadow: none; }
body[data-version="v4"] #core-technology .tech-copy { padding: 46px 28px 42px 44px; }
body[data-version="v4"] #core-technology .tech-copy h3 { font-size: 46px; }
body[data-version="v4"] #core-technology .tech-thumbnail { padding: 0; background: #f0f5f8; }
body[data-version="v4"] #core-technology .tech-thumbnail img { height: 380px; transition: transform .45s ease; }
body[data-version="v4"] #core-technology .tech-card:hover .tech-thumbnail img { transform: scale(1.025); }
body[data-version="v4"] .tinted { background: #f2f5f8; }
body[data-version="v4"] .dark { background: linear-gradient(135deg, #071a30, #0b2945); }
body[data-version="v4"] .dark .info-card { padding: 33px 0 4px; border: 0; border-top: 1px solid rgba(171,211,225,.31); border-radius: 0; background: transparent; }
body[data-version="v4"] .dark .info-card h3 { font-size: 25px; }
body[data-version="v4"] .info-card { border-radius: 7px; box-shadow: none; }
body[data-version="v4"] .story-card, body[data-version="v4"] .instrument, body[data-version="v4"] .sampling-panel, body[data-version="v4"] .brief-panel { border-radius: 7px; }
body[data-version="v4"] .story-image { height: 330px; }
body[data-version="v4"] .analysis-explorer { box-shadow: 0 32px 80px rgba(10,34,61,.1); }
body[data-version="v4"] .service-step { border-radius: 5px; }
body[data-version="v4"] .product-section { background: #eaf0f5; }
body[data-version="v4"] .instrument { padding: 0; overflow: hidden; }
body[data-version="v4"] .instrument img { max-height: 500px; width: 100%; object-fit: cover; }

/* Three linked scales of evidence. */
.v4-signal-atlas { background: var(--v4-fog); }
.signal-stack { border-top: 1px solid #bdcdd9; }
.signal-panel { display: grid; grid-template-columns: minmax(0,1.06fr) minmax(360px,.94fr); align-items: stretch; min-height: 410px; padding-block: 45px; border-bottom: 1px solid #bdcdd9; }
.signal-panel:nth-child(even) .signal-visual { order: 2; }
.signal-visual { position: relative; display: grid; place-items: center; min-height: 345px; padding: 42px; overflow: hidden; background: #fff; border: 1px solid #d3dee7; }
.signal-visual::before { content: ""; position: absolute; width: 260px; height: 260px; border-radius: 50%; right: -90px; top: -120px; background: rgba(72,195,191,.13); filter: blur(14px); }
.signal-visual img { position: relative; max-width: 90%; max-height: 255px; object-fit: contain; transition: transform .5s ease; }
.signal-panel:hover .signal-visual img { transform: scale(1.035); }
.signal-visual > span { position: absolute; left: 19px; bottom: 14px; color: #72889a; font-size: 9px; line-height: 1.6; }
.signal-copy { align-self: center; padding: 30px clamp(34px,5vw,74px); }
.signal-meta { display: flex; align-items: center; gap: 18px; }
.signal-meta > span { color: var(--v4-teal); font-size: 12px; font-weight: 750; }
.signal-meta > p { color: #688196; font-size: 9px; letter-spacing: .15em; font-weight: 750; }
.signal-copy h3 { margin-top: 25px; font-size: clamp(38px,4vw,55px); color: var(--v4-midnight); }
.signal-copy > strong { display: block; margin-top: 13px; color: #1f6e76; font-size: 20px; font-weight: 650; }
.signal-copy > p { margin-top: 20px; color: #5b7288; font-size: 15px; line-height: 1.95; }
.signal-copy .text-link { margin-top: 25px; }

/* Detail pages and footer share the V4 rhythm. */
body[data-version="v4"] .page-hero { position: relative; overflow: hidden; padding-block: clamp(76px,8vw,116px); background: radial-gradient(circle at 82% 26%, rgba(56,181,178,.18), transparent 31%), linear-gradient(132deg,#f9fbfd 20%,#eaf1f6 100%); }
body[data-version="v4"] .page-hero::after { content: ""; position: absolute; inset: auto -80px -240px auto; width: 520px; height: 520px; border: 1px solid rgba(18,96,124,.13); border-radius: 50%; box-shadow: 0 0 0 70px rgba(18,96,124,.04), 0 0 0 140px rgba(18,96,124,.025); pointer-events: none; }
body[data-version="v4"] .page-hero > .container { position: relative; z-index: 1; }
body[data-version="v4"] .page-hero h1, body[data-version="v4"] .page-hero.with-figure h1 { font-size: clamp(46px,5.2vw,72px); line-height: 1.2; letter-spacing: -.055em; }
body[data-version="v4"] .page-hero-figure { height: 350px; }
body[data-version="v4"] .page-hero-figure img { max-height: 320px; }
body[data-version="v4"] .metric-strip { border-radius: 5px; }
body[data-version="v4"] .research-figure { border-radius: 5px; }
body[data-version="v4"] .cta-section { padding-block: 75px; background: linear-gradient(120deg,#0b2d51,#0c5b66); }
body[data-version="v4"] .site-footer { padding-top: 67px; color: #fff; background: #06172b; border-top: 0; }
body[data-version="v4"] .footer-brand img { width: 138px; padding: 4px 8px; background: rgba(255,255,255,.96); }
body[data-version="v4"] .footer-brand p, body[data-version="v4"] .footer-links a { color: #9eb2c4; }
body[data-version="v4"] .footer-links h2 { color: #dce8f1; }
body[data-version="v4"] .footer-bottom { border-top-color: rgba(184,211,225,.18); }
body[data-version="v4"] .footer-bottom p { color: #718ba1; }

/* Added only after JS confirms observer support; no-JS content remains visible. */
.v4-motion-ready .v4-reveal { opacity: 0; transform: translateY(22px); transition: opacity .72s ease, transform .72s cubic-bezier(.2,.65,.25,1); }
.v4-motion-ready .v4-reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1150px) {
  body[data-version="v4"] .container { width: calc(100% - 64px); }
  .v4-home-hero .hero-grid { grid-template-columns: minmax(0,1fr) 270px; gap: 45px; }
  .v4-home-hero .hero-copy h1 { font-size: clamp(54px,6vw,76px); }
  .v4-section-head { gap: 55px; }
  .continuum-track li { padding-inline: 18px; }
  .signal-panel { grid-template-columns: 1fr 1fr; }
  body[data-version="v4"] #core-technology .tech-card { grid-template-columns: minmax(0,1fr) 115px; }
}

@media (max-width: 820px) {
  body[data-version="v4"] .container { width: calc(100% - 40px); }
  .v4-home-hero { min-height: auto; }
  .v4-hero-media img { object-position: 66% center; }
  .v4-hero-media::after { background: linear-gradient(90deg,rgba(4,18,35,.97),rgba(4,18,35,.64)), linear-gradient(0deg,rgba(4,18,35,.97),transparent 48%); }
  .v4-home-hero .hero-grid { grid-template-columns: 1fr; padding-block: 74px 42px; }
  .v4-home-hero .hero-copy h1 { font-size: clamp(50px,12.5vw,73px); }
  .v4-hero-lenses { justify-self: start; align-self: auto; width: 100%; margin: 0; }
  .v4-hero-lenses ol { display: grid; grid-template-columns: repeat(3,1fr); }
  .v4-hero-lenses li { grid-template-columns: 27px 1fr; padding-right: 10px; }
  .v4-hero-dock { grid-template-columns: 1fr; gap: 18px; }
  .v4-section-head { grid-template-columns: 1fr; gap: 28px; }
  .continuum-stage, .continuum-track { min-height: 760px; }
  .continuum-track { grid-template-columns: 1fr 1fr; gap: 1px; align-content: end; }
  .continuum-track li { min-height: 205px; }
  .signal-panel { grid-template-columns: 1fr; }
  .signal-panel:nth-child(even) .signal-visual { order: 0; }
  .signal-copy { padding: 42px 6px 10px; }
  body[data-version="v4"] #core-technology .tech-card { min-height: 380px; }
  body[data-version="v4"] #core-technology .tech-copy { padding: 34px 20px 34px 30px; }
  body[data-version="v4"] #core-technology .tech-copy h3 { font-size: 38px; }
}

@media (max-width: 560px) {
  body[data-version="v4"] .header-inner { width: calc(100% - 28px); min-height: 70px; }
  body[data-version="v4"] .brand, body[data-version="v4"] .brand img { width: 104px; flex-basis: 104px; }
  body[data-version="v4"] .section { padding-block: 70px; }
  body[data-version="v4"] h2 { font-size: 36px; }
  .v4-home-hero .hero-grid { gap: 35px; padding-top: 58px; }
  .v4-home-hero .hero-copy h1 { font-size: 49px; line-height: 1.1; }
  .v4-home-hero .hero-lead { font-size: 15px; }
  .v4-hero-lenses { padding-inline: 20px; }
  .v4-hero-lenses ol { grid-template-columns: 1fr; }
  .v4-hero-lenses li { grid-template-columns: 30px 1fr; }
  .v4-sample-lanes { grid-template-columns: 1fr; gap: 13px; }
  .v4-sample-lanes > a { min-height: 58px; }
  .v4-proof-band .proof-strip { padding-block: 26px; }
  .continuum-stage, .continuum-track { min-height: 930px; }
  .continuum-media img { object-position: 67% center; }
  .continuum-track { grid-template-columns: 1fr; padding-inline: 12px; }
  .continuum-track li { min-height: 178px; padding: 18px 19px; }
  .continuum-track h3 { margin-top: 10px; }
  .signal-panel { padding-block: 32px; min-height: 0; }
  .signal-visual { min-height: 270px; padding: 30px 18px 44px; }
  .signal-copy h3 { font-size: 39px; }
  body[data-version="v4"] #core-technology .tech-card { grid-template-columns: minmax(0,1fr) 70px; }
  body[data-version="v4"] #core-technology .tech-copy { padding-left: 22px; }
  body[data-version="v4"] #core-technology .tech-copy h3 { font-size: 34px; }
  body[data-version="v4"] .page-hero h1, body[data-version="v4"] .page-hero.with-figure h1 { font-size: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  .v4-motion-ready .v4-reveal { opacity: 1; transform: none; transition: none; }
  .v4-hero-media img, .signal-visual img, body[data-version="v4"] #core-technology .tech-thumbnail img { transform: none !important; transition: none; }
}

@media print {
  .v4-home-hero, .v4-continuum, body[data-version="v4"] .site-footer { background: #fff !important; color: #102f50 !important; }
  .v4-hero-media { opacity: .12; }
  .v4-home-hero .hero-copy h1, .v4-continuum h2, .continuum-track h3 { color: #102f50; }
  .v4-hero-lenses, .continuum-track li { background: #fff; border-color: #c9d5df; }
  .continuum-stage, .continuum-track { min-height: auto; }
  .continuum-track { grid-template-columns: repeat(2,1fr); }
}