:root {
  --bg: #050a0f;
  --surface: #0a141d;
  --surface-2: #0e1c27;
  --ink: #f2f7f9;
  --muted: #93a4b2;
  --accent: #33d6ff;
  --accent-deep: #087ea4;
  --line: #20475b;
  --page: min(1440px, calc(100vw - 96px));
}

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

.page-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .38;
  z-index: -2;
  background-image:
    linear-gradient(rgba(32, 71, 91, .14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(32, 71, 91, .14) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, #000, rgba(0,0,0,.5) 60%, transparent);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(48px, calc((100vw - 1440px) / 2));
  border-bottom: 1px solid rgba(32, 71, 91, .55);
  background: rgba(5, 10, 15, .82);
  backdrop-filter: blur(18px);
}
.brand img { width: 116px; max-height: 48px; object-fit: contain; }
.site-header nav { display: flex; align-items: center; gap: 34px; }
.site-header nav a {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  transition: color .25s ease, border-color .25s ease, background-color .25s ease;
}
.site-header nav a:hover { color: var(--ink); }
.site-header .nav-cta { padding: 13px 18px; border: 1px solid var(--accent-deep); color: var(--accent); }
.site-header .nav-cta:hover { background: rgba(51,214,255,.08); border-color: var(--accent); }

.hero {
  position: relative;
  min-height: 100vh;
  width: var(--page);
  margin: 0 auto;
  padding: 160px 0 92px;
  display: grid;
  grid-template-columns: .92fr 1.08fr;
  align-items: center;
  gap: 48px;
}
.hero::before {
  content: "";
  position: absolute;
  width: 760px;
  height: 760px;
  right: -160px;
  top: 130px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(51,214,255,.13), rgba(8,126,164,.035) 48%, transparent 70%);
  pointer-events: none;
}
.eyebrow {
  margin: 0 0 20px;
  color: var(--accent);
  font: 700 13px/1.4 "IBM Plex Mono", monospace;
  letter-spacing: .17em;
  text-transform: uppercase;
}
h1, h2 { margin: 0; font-weight: 900; letter-spacing: -.055em; }
h1 { font-size: clamp(68px, 6.2vw, 108px); line-height: .93; }
h1 span { display: block; color: var(--accent); }
h2 { max-width: 920px; font-size: clamp(44px, 4.4vw, 72px); line-height: .98; }
.hero-lede {
  max-width: 670px;
  margin: 34px 0 0;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.65;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border: 1px solid var(--line);
  font: 700 12px "IBM Plex Mono", monospace;
  letter-spacing: .075em;
  text-transform: uppercase;
  transition: transform .22s ease, color .22s ease, background-color .22s ease, box-shadow .22s ease;
}
.button:hover { transform: translateY(-2px); }
.button.primary { color: var(--bg); background: var(--accent); border-color: var(--accent); box-shadow: 0 0 30px rgba(51,214,255,.18); }
.button.primary:hover { box-shadow: 0 0 40px rgba(51,214,255,.34); }
.button.secondary { color: var(--ink); background: rgba(10,20,29,.6); }
.button.text-link { border-color: transparent; color: var(--accent); padding-inline: 8px; }
.button.text-link:hover { background: rgba(51,214,255,.06); }
.button.large { min-height: 62px; padding-inline: 30px; }
.hero-visual {
  position: relative;
  min-height: 620px;
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(14,28,39,.6), rgba(5,10,15,.9));
  overflow: hidden;
}
.hero-visual::before,
.engine-panel::before {
  content: "";
  position: absolute;
  inset: 16px;
  pointer-events: none;
  background:
    linear-gradient(var(--ink), var(--ink)) left top / 24px 2px no-repeat,
    linear-gradient(var(--ink), var(--ink)) left top / 2px 24px no-repeat,
    linear-gradient(var(--ink), var(--ink)) right bottom / 24px 2px no-repeat,
    linear-gradient(var(--ink), var(--ink)) right bottom / 2px 24px no-repeat;
  opacity: .75;
  z-index: 3;
}
.hero-visual img {
  width: 100%;
  height: 100%;
  min-height: 620px;
  object-fit: contain;
  mix-blend-mode: normal;
  filter: brightness(1.12) contrast(1.05) saturate(.94) drop-shadow(0 28px 34px rgba(0,0,0,.55));
}
.technical-label {
  position: absolute;
  left: 28px;
  top: 26px;
  z-index: 4;
  color: var(--accent);
  font: 700 11px "IBM Plex Mono", monospace;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.hero-scan {
  position: absolute;
  left: 8%;
  right: 8%;
  top: 30%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), var(--ink), var(--accent), transparent);
  box-shadow: 0 0 22px rgba(51,214,255,.7);
  opacity: .55;
  animation: heroScan 5.5s ease-in-out infinite;
}
@keyframes heroScan { 0%, 18% { transform: translateY(-110px); opacity: 0; } 34%, 70% { opacity: .6; } 82%, 100% { transform: translateY(370px); opacity: 0; } }
.scroll-cue {
  position: absolute;
  left: 0;
  bottom: 28px;
  color: var(--muted);
  font: 700 11px "IBM Plex Mono", monospace;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.scroll-cue span { display: inline-block; width: 60px; height: 1px; margin-right: 14px; vertical-align: middle; background: var(--accent); }

.advantage,
.breadth,
.credentials {
  width: var(--page);
  margin: 0 auto;
  padding: 150px 0;
  border-top: 1px solid var(--line);
}
.section-intro { display: grid; gap: 4px; }
.advantage-grid {
  display: grid;
  grid-template-columns: .88fr 1.12fr;
  gap: 44px;
  margin-top: 72px;
}
.stat-card,
.advantage-copy {
  min-height: 380px;
  padding: 44px;
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(14,28,39,.88), rgba(5,10,15,.7));
}
.stat { color: var(--accent); font-size: clamp(92px, 10vw, 168px); font-weight: 900; line-height: .9; letter-spacing: -.08em; font-variant-numeric: tabular-nums; }
.stat span { font-size: .36em; margin-left: 8px; vertical-align: top; letter-spacing: -.03em; }
.stat-card p,
.advantage-copy p,
.credentials-copy p,
.final-cta p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}
.advantage-copy { display: flex; flex-direction: column; justify-content: center; }
.advantage-copy p { font-size: 22px; color: var(--ink); }
.advantage-copy ul { margin: 24px 0 0; padding: 0; list-style: none; }
.advantage-copy li { position: relative; padding: 15px 0 15px 32px; border-top: 1px solid rgba(32,71,91,.65); color: var(--muted); line-height: 1.5; }
.advantage-copy li::before { content: "✓"; position: absolute; left: 4px; color: var(--accent); }

.capability-intro {
  width: var(--page);
  margin: 0 auto;
  padding: 150px 0 90px;
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 70px;
  align-items: end;
  border-top: 1px solid var(--line);
}
.intro-side { margin: 0 0 8px; color: var(--muted); font-size: 18px; line-height: 1.65; }
.model-coverage {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 28px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.model-coverage span {
  min-height: 72px;
  display: grid;
  place-items: center;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--accent);
  font: 700 12px "IBM Plex Mono", monospace;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.scroll-zone { position: relative; height: 400vh; }
.scroll-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 104px 0 42px;
  display: flex;
  align-items: center;
  background: rgba(5,10,15,.88);
}
.scroll-layout {
  width: var(--page);
  height: min(760px, calc(100vh - 140px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: .82fr 1.18fr;
  gap: 44px;
}
.accordion-panel,
.engine-panel { min-width: 0; }
.panel-heading,
.engine-panel-heading,
.engine-footer {
  font: 700 11px "IBM Plex Mono", monospace;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.panel-heading {
  height: 48px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
}
.panel-heading span:last-child { color: var(--accent); }
.accordion { border-top: 1px solid rgba(32,71,91,.7); }
.chapter {
  width: 100%;
  min-height: 92px;
  display: grid;
  grid-template-columns: 52px 1fr 24px;
  align-items: start;
  gap: 18px;
  padding: 20px 18px;
  color: var(--ink);
  text-align: left;
  border: 0;
  border-bottom: 1px solid rgba(32,71,91,.65);
  background: transparent;
  cursor: pointer;
  transition: min-height .55s cubic-bezier(.16,1,.3,1), background-color .35s ease, border-color .35s ease, transform .35s ease;
}
.chapter:hover { background: rgba(14,28,39,.4); }
.chapter.is-active {
  min-height: 260px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  background: linear-gradient(110deg, rgba(14,28,39,.96), rgba(10,20,29,.72));
}
.chapter-index {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  color: var(--muted);
  font: 700 13px "IBM Plex Mono", monospace;
}
.chapter.is-active .chapter-index { color: var(--accent); border-color: var(--accent); }
.chapter-main { display: block; min-width: 0; }
.chapter-title { display: block; padding-top: 10px; font-size: clamp(18px, 1.45vw, 25px); font-weight: 800; line-height: 1.12; }
.chapter.is-active .chapter-title { color: var(--accent); }
.chapter-symbol { padding-top: 7px; color: var(--muted); font-size: 25px; line-height: 1; }
.chapter-detail {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transform: translateY(12px);
  transition: grid-template-rows .55s cubic-bezier(.16,1,.3,1), opacity .3s ease, transform .5s cubic-bezier(.16,1,.3,1);
}
.chapter.is-active .chapter-detail { grid-template-rows: 1fr; opacity: 1; transform: translateY(0); }
.chapter-copy { overflow: hidden; padding-top: 18px; color: var(--muted); font-size: 15px; line-height: 1.55; }
.component-list { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 16px; }
.component-list span {
  padding: 8px 9px;
  border: 1px solid var(--line);
  color: var(--ink);
  font: 700 9px "IBM Plex Mono", monospace;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.engine-panel { position: relative; border: 1px solid var(--line); background: rgba(5,10,15,.86); overflow: hidden; }
.engine-panel-heading {
  position: absolute;
  left: 34px;
  right: 34px;
  top: 28px;
  z-index: 4;
  display: flex;
  justify-content: space-between;
  align-items: start;
  color: var(--accent);
}
.engine-panel-heading strong {
  max-width: 46%;
  color: var(--ink);
  font: 800 clamp(20px, 1.6vw, 28px) "Montserrat", sans-serif;
  letter-spacing: -.03em;
  text-align: right;
  text-transform: none;
}
.engine-stack { position: absolute; inset: 94px 24px 65px; overflow: hidden; background: var(--bg); }
.engine-state {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transform: scale(1.22) translateX(18px);
  filter: invert(1) hue-rotate(180deg) contrast(1.08);
  mix-blend-mode: screen;
  transition: opacity .48s ease, transform .85s cubic-bezier(.16,1,.3,1);
  will-change: opacity, transform;
}
.engine-state.is-active { opacity: 1; transform: scale(1.34) translateX(0); }
.engine-scan {
  position: absolute;
  left: 8%;
  right: 8%;
  top: 50%;
  height: 1px;
  opacity: 0;
  background: linear-gradient(90deg, transparent, var(--accent), var(--ink), var(--accent), transparent);
  box-shadow: 0 0 18px rgba(51,214,255,.85);
  pointer-events: none;
}
.engine-scan.is-scanning { animation: zoneScan .7s ease-in-out; }
@keyframes zoneScan { 0% { opacity: 0; transform: translateY(-210px); } 25%, 72% { opacity: .85; } 100% { opacity: 0; transform: translateY(210px); } }
.engine-footer {
  position: absolute;
  left: 34px;
  right: 34px;
  bottom: 25px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
}
.progress { display: flex; gap: 8px; }
.progress span { width: 34px; height: 3px; background: var(--line); transition: background-color .3s ease, box-shadow .3s ease; }
.progress span.is-active { background: var(--accent); box-shadow: 0 0 10px rgba(51,214,255,.5); }

.breadth { padding-top: 170px; }
.capability-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 70px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.capability-grid span {
  min-height: 112px;
  display: flex;
  align-items: center;
  padding: 22px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font: 700 12px/1.5 "IBM Plex Mono", monospace;
  text-transform: uppercase;
  transition: color .25s ease, background-color .25s ease;
}
.capability-grid span:hover { color: var(--accent); background: rgba(14,28,39,.72); }

.credentials { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; position: relative; }
.credentials-copy p { max-width: 680px; }
.credential-list { display: grid; grid-template-columns: 1fr 1fr; align-self: center; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.credential-list span {
  min-height: 100px;
  display: grid;
  place-items: center;
  padding: 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--accent);
  font: 700 12px "IBM Plex Mono", monospace;
  letter-spacing: .06em;
  text-align: center;
  text-transform: uppercase;
}
.credential-note { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 12px; line-height: 1.5; }

.final-cta {
  position: relative;
  width: var(--page);
  min-height: 620px;
  margin: 0 auto 100px;
  display: grid;
  place-items: center;
  text-align: center;
  border: 1px solid var(--line);
  overflow: hidden;
  background: linear-gradient(145deg, rgba(14,28,39,.8), rgba(5,10,15,.88));
}
.final-cta > div:not(.cta-glow) { position: relative; z-index: 2; max-width: 980px; padding: 60px; }
.final-cta h2 { margin-inline: auto; }
.final-cta p { max-width: 760px; margin: 28px auto 34px; }
.cta-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }
.cta-glow {
  position: absolute;
  width: 780px;
  height: 780px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(51,214,255,.16), rgba(8,126,164,.04) 48%, transparent 70%);
}

footer {
  width: var(--page);
  min-height: 120px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font: 600 11px "IBM Plex Mono", monospace;
  letter-spacing: .08em;
  text-transform: uppercase;
}
footer img { width: 104px; }

.reveal { opacity: 0; transform: translateY(30px); transition: opacity .8s ease, transform .8s cubic-bezier(.16,1,.3,1); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1100px) {
  :root { --page: calc(100vw - 48px); }
  .site-header { padding-inline: 24px; }
  .site-header nav a:not(.nav-cta) { display: none; }
  .reveal,
  .reveal.is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .hero { grid-template-columns: 1fr; padding-top: 130px; }
  .hero-visual { min-height: 500px; }
  .hero-visual img { min-height: 500px; }
  .advantage-grid, .capability-intro, .credentials { grid-template-columns: 1fr; }
  .model-coverage { grid-column: 1; }
  .scroll-zone { height: auto; }
  .scroll-sticky { position: relative; height: auto; padding-block: 90px; }
  .scroll-layout { height: auto; grid-template-columns: 1fr; }
  .engine-panel { min-height: 620px; order: -1; }
  .capability-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 650px) {
  :root { --page: calc(100vw - 28px); }
  .site-header { height: 70px; }
  .brand img { width: 92px; }
  .site-header .nav-cta { padding: 10px 12px; font-size: 10px; }
  h1 { font-size: 56px; }
  h2 { font-size: 42px; }
  .hero { padding-top: 110px; }
  .hero-visual, .hero-visual img { min-height: 390px; }
  .advantage, .breadth, .credentials { padding-block: 100px; }
  .stat-card, .advantage-copy { padding: 28px; min-height: auto; }
  .engine-panel { min-height: 500px; }
  .engine-panel-heading span { display: none; }
  .engine-panel-heading strong { max-width: 100%; }
  .chapter.is-active { min-height: 300px; }
  .capability-grid { grid-template-columns: 1fr; }
  .model-coverage { grid-template-columns: repeat(2, 1fr); }
  .credential-list { grid-template-columns: 1fr; }
  footer { grid-template-columns: 1fr; padding-block: 32px; gap: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}