:root {
  --ink: #0b1118;
  --paper: #f4f6f8;
  --blue: #0984ff;
  --cyan: #22d3ee;
  --muted: #7f8a96;
  --line: rgba(10, 18, 28, 0.14);
  --line-light: rgba(255, 255, 255, 0.12);
  --dark: #07131f;
  --dark2: #0a1d2d;
  --dark3: #0e2436;
  --darktext: #eaf6ff;
  --max: 1240px;
  --radius: 22px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p, figure { margin: 0; }

img { display: block; max-width: 100%; }

a { color: inherit; }

.boe-share-brand {
  position: fixed;
  top: 28px;
  left: max(6vw, calc((100vw - var(--max)) / 2));
  z-index: 85;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-size: 13px;
  line-height: 1;
  letter-spacing: .12em;
}
.boe-share-brand span {
  display: grid;
  place-items: center;
  min-width: 42px;
  height: 26px;
  padding: 0 8px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #fff;
  font-weight: 850;
  letter-spacing: -.04em;
}
.boe-share-brand strong { font-size: 12px; font-weight: 720; }

/* Progress */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 100;
  background: rgba(255, 255, 255, 0.08);
}
.progress i {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  transition: width 0.1s linear;
}

/* Back button */
.back {
  position: fixed;
  top: 24px;
  left: 28px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 17px;
  border: 0;
  border-radius: 999px;
  background: rgba(4, 14, 24, 0.62);
  color: #fff;
  text-decoration: none;
  font-size: 13px;
  backdrop-filter: blur(18px);
  cursor: pointer;
  transition: background 0.25s;
}
.back svg { flex: none; }
.back:hover { background: rgba(4, 14, 24, 0.85); }
.back:active { background: rgba(4, 14, 24, 0.95); }

/* Chapter nav */
.chapter-nav {
  position: fixed;
  top: 18px;
  right: max(6vw, calc((100vw - var(--max)) / 2));
  z-index: 80;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  background: rgba(4, 14, 24, 0.66);
  box-shadow: 0 12px 38px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(18px) saturate(145%);
}
.chapter-nav a {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 13px;
  border-radius: 999px;
  color: rgba(224, 236, 246, 0.68);
  text-decoration: none;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.24s ease, background 0.24s ease, box-shadow 0.24s ease;
}
.chapter-nav a span {
  display: block;
}
.chapter-nav a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}
.chapter-nav a:active {
  background: rgba(255, 255, 255, 0.14);
}
.chapter-nav a.active {
  color: #fff;
  background: rgba(9, 132, 255, 0.92);
  box-shadow: 0 5px 16px rgba(9, 132, 255, 0.28);
}

/* Hero */
.hero {
  min-height: 100vh;
  position: relative;
  overflow: hidden;
  padding: 11vh max(6vw, calc((100vw - var(--max)) / 2));
  display: grid;
  grid-template-columns: minmax(0, 48%) minmax(0, 1fr);
  column-gap: 4%;
  align-items: center;
  background:
    radial-gradient(circle at 78% 48%, rgba(15, 143, 255, 0.18), transparent 30%),
    radial-gradient(circle at 24% 86%, rgba(34, 211, 238, 0.08), transparent 28%),
    linear-gradient(140deg, #04101c, #081a2a 55%, #06243b);
  color: #fff;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 90px 90px;
  mask-image: linear-gradient(to right, #000 20%, transparent 80%);
  -webkit-mask-image: linear-gradient(to right, #000 20%, transparent 80%);
}

.hero-copy { position: relative; z-index: 3; width: 100%; }

.kicker {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--blue);
  text-transform: uppercase;
}
.hero .kicker,
.dark-section .kicker { color: #4cc9ff; }

.hero h1 {
  font-size: clamp(54px, 7vw, 112px);
  line-height: 0.97;
  letter-spacing: -0.065em;
  margin: 28px 0 34px;
}
.hero h1 span {
  display: block;
  font-size: 0.52em;
  color: #88d8ff;
  letter-spacing: -0.04em;
  margin-top: 0.12em;
}

.hero-lead {
  font-size: clamp(17px, 1.45vw, 22px);
  line-height: 1.75;
  color: #b4c5d4;
  max-width: 560px;
}

.meta {
  display: grid;
  grid-template-columns: repeat(3, max-content);
  gap: clamp(18px, 3vw, 40px);
  margin-top: 58px;
  max-width: 100%;
}
.meta div {
  min-width: 0;
}
.meta small {
  display: block;
  font-size: 10px;
  letter-spacing: 0.16em;
  color: #7f9cb5;
}
.meta b {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
}

.hero-collab {
  position: relative;
  z-index: 2;
  width: min(100%, 680px);
  aspect-ratio: 1.16;
  justify-self: end;
}
.collab-heading {
  position: absolute;
  left: 2%;
  right: 2%;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #d7edfa;
  font-size: 11px;
  letter-spacing: 0.08em;
}
.collab-heading > span { font-weight: 750; }
.collab-heading b { display: flex; align-items: center; gap: 7px; color: #8ba7ba; font-weight: 500; }
.collab-heading b i { width: 7px; height: 7px; border-radius: 50%; background: #3be5a3; box-shadow: 0 0 12px #3be5a3; }
.connection-map { position: absolute; inset: 0; overflow: visible; }
.connection-map::before,
.connection-map::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(66, 190, 255, 0.13);
  border-radius: 50%;
  left: 50%;
  top: 42%;
  transform: translate(-50%, -50%);
}
.connection-map::before { width: 72%; aspect-ratio: 1; }
.connection-map::after { width: 96%; aspect-ratio: 1; }
.connection-line { position: absolute; height: 1px; transform-origin: left center; background: linear-gradient(90deg, #45c8ff, rgba(69, 200, 255, 0.08)); }
.line-phone { width: 30%; left: 52%; top: 56%; transform: rotate(58deg); }
.line-pc { width: 31%; left: 47%; top: 57%; transform: rotate(132deg); }
.connection-pulse { position: absolute; width: 7px; height: 7px; border-radius: 50%; background: #6bddff; box-shadow: 0 0 14px #2fbaff; }
.pulse-a { left: 70%; top: 67%; }
.pulse-b { left: 31%; top: 66%; }
.device { position: absolute; z-index: 2; }
.device-display {
  width: 72%;
  left: 14%;
  top: 12%;
  padding: 7px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 15px;
  background: #152c3c;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.44);
  overflow: hidden;
}
.device-display img { display: block; width: 100%; border-radius: 7px; }
.device-bar { height: 24px; display: flex; align-items: center; gap: 7px; padding: 0 4px; font-size: 9px; color: #acc3d2; }
.device-bar span { width: 6px; height: 6px; border-radius: 50%; background: #37dca0; }
.device-bar b { font-weight: 600; }
.device-bar em { margin-left: auto; color: #49c8ff; font-style: normal; }
.display-stand { position: absolute; width: 18%; height: 20px; left: 41%; bottom: -20px; border-bottom: 5px solid #28495d; border-left: 5px solid transparent; border-right: 5px solid transparent; }
.device-laptop { width: 34%; left: 8%; bottom: 5%; }
.laptop-screen { aspect-ratio: 1.55; padding: 8%; border: 5px solid #203b4e; border-radius: 10px 10px 3px 3px; background: #f1f6f9; color: #193248; box-shadow: 0 18px 35px rgba(0, 0, 0, 0.35); }
.windows-head { display: flex; justify-content: space-between; font-size: 8px; font-weight: 700; }
.windows-head i { color: #008df4; font-style: normal; }
.share-file { margin-top: 9%; padding: 8%; border-radius: 7px; background: #fff; box-shadow: 0 4px 14px rgba(23, 62, 87, 0.1); }
.share-file b, .share-file span, .share-file em { display: block; }
.share-file b { font-size: 8px; }
.share-file span, .share-file em { margin-top: 3px; color: #7d93a2; font-size: 6px; font-style: normal; }
.share-progress { height: 3px; margin-top: 7%; border-radius: 3px; background: #d7e5ed; overflow: hidden; }
.share-progress i { display: block; width: 72%; height: 100%; background: linear-gradient(90deg, #058dff, #35d2ff); }
.laptop-base { width: 112%; height: 8px; margin-left: -6%; border-radius: 0 0 50% 50%; background: linear-gradient(#517184, #1d394b); }
.device-phone { width: 17%; right: 10%; bottom: 5%; }
.phone-frame { padding: 5px; border-radius: 16px; background: #152d3e; box-shadow: 0 18px 35px rgba(0, 0, 0, 0.4); }
.phone-frame img { display: block; width: 100%; border-radius: 12px; }
.device-label { display: block; margin-top: 8px; color: #8faabd; font-size: 9px; text-align: center; letter-spacing: 0.12em; }

.hero-orbit {
  position: absolute;
  border: 1px solid rgba(40, 184, 255, 0.16);
  border-radius: 50%;
  pointer-events: none;
  transform-origin: center;
  animation: hero-ripple 8s ease-out infinite;
}
.orbit-a { width: 720px; height: 720px; right: -120px; top: 12%; }
.orbit-b { width: 500px; height: 500px; right: 30px; bottom: 8%; animation-delay: -4s; }
@keyframes hero-ripple {
  0% { opacity: 0; transform: scale(0.78); }
  22% { opacity: 0.75; }
  100% { opacity: 0; transform: scale(1.12); }
}

/* Sections */
.dark-section {
  background: linear-gradient(145deg, var(--dark), var(--dark2));
  color: var(--darktext);
}

.chapter {
  position: relative;
  padding: 150px max(6vw, calc((100vw - var(--max)) / 2));
}
.chapter + .chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: max(6vw, calc((100vw - var(--max)) / 2));
  right: max(6vw, calc((100vw - var(--max)) / 2));
  height: 1px;
  background: var(--line);
}
.dark-section + .dark-section::before {
  background: var(--line-light);
}

.chapter-head {
  max-width: 920px;
  margin-bottom: 72px;
}
.chapter-no {
  display: inline-block;
  margin-bottom: 22px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--muted);
}
.dark-section .chapter-no { color: #5a778e; }

.chapter-head h2,
.opening h2 {
  font-size: clamp(36px, 4.6vw, 66px);
  line-height: 1.12;
  letter-spacing: -0.045em;
  margin-top: 18px;
}
.chapter-head h2 span { color: var(--blue); }
.dark-section .chapter-head h2 span { color: #52c9ff; }

.chapter-lead {
  max-width: 720px;
  margin-top: 28px;
  font-size: 17px;
  line-height: 1.8;
  color: #64717d;
}
.dark-section .chapter-lead { color: #8fa6b8; }

/* Complexity */
.complexity {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  margin-top: 60px;
  border-top: 1px solid var(--line-light);
}
.complexity article {
  min-height: 280px;
  padding: 28px 24px 26px;
  border-right: 1px solid var(--line-light);
}
.complexity article:last-child { border-right: 0; }
.complexity i {
  display: block;
  color: #4cc9ff;
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.1em;
}
.complexity b {
  display: block;
  margin: 16px 0 14px;
  font-size: 20px;
  font-weight: 600;
}
.complexity-visual {
  display: grid;
  width: 48px;
  height: 48px;
  margin-top: 24px;
  place-items: center;
  border: 1px solid rgba(76, 201, 255, 0.2);
  border-radius: 14px;
  background: linear-gradient(145deg, rgba(76, 201, 255, 0.12), rgba(76, 201, 255, 0.025));
  color: #6ed5ff;
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.08);
}
.complexity-visual svg {
  width: 30px;
  height: 30px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.complexity p {
  color: #8da5b8;
  line-height: 1.7;
  font-size: 14px;
}

.source-note {
  max-width: 760px;
  margin-top: 52px;
  color: #8da5b8;
  line-height: 1.75;
  font-size: 14px;
}

/* Journey */
.journey {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  position: relative;
  margin: 80px 0 72px;
  gap: 24px;
}
.journey-line {
  position: absolute;
  left: 0;
  right: 0;
  top: 21px;
  height: 1px;
  background: var(--line);
}
.journey article {
  position: relative;
  padding-right: 28px;
}
.journey span {
  position: relative;
  z-index: 2;
  display: flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}
.journey b {
  display: block;
  margin: 28px 0 10px;
  font-size: 21px;
  font-weight: 600;
}
.journey p {
  font-size: 14px;
  line-height: 1.65;
  color: #6e7984;
}
.journey em {
  display: block;
  margin-top: 26px;
  color: #e85757;
  font-style: normal;
  font-size: 13px;
  line-height: 1.5;
}

/* Evidence figures */
.evidence {
  margin-top: 60px;
  background: #fff;
  border: 1px solid #dfe5ea;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 25px 70px rgba(18, 48, 74, 0.1);
}
.evidence img { width: 100%; }
.evidence figcaption {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  padding: 22px 26px;
  color: #55616c;
  font-size: 13px;
  line-height: 1.5;
}
.evidence figcaption b { color: var(--ink); font-weight: 600; }
.evidence figcaption span { color: #7a8794; }

.evidence-dark {
  background: var(--dark3);
  border-color: rgba(255, 255, 255, 0.12);
}
.evidence-dark figcaption { color: #8fa6b8; }
.evidence-dark figcaption b { color: #eaf6ff; }

/* Insight callout */
.insight {
  margin: 24px 0 60px;
  padding: 28px 32px;
  border-left: 3px solid var(--cyan);
  background: rgba(34, 211, 238, 0.06);
  border-radius: 0 14px 14px 0;
  max-width: 820px;
}
.insight p { color: #8fa6b8; line-height: 1.7; font-size: 15px; }
.insight p:first-child { margin-bottom: 8px; }
.insight strong { color: #fff; font-size: 13px; letter-spacing: 0.1em; }

/* Models */
.models {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 70px;
}
.models article {
  padding: 32px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
  transition: transform 0.3s, border-color 0.3s;
}
.models article:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.28);
}
.models small {
  color: #4cc9ff;
  letter-spacing: 0.12em;
  font-size: 11px;
  font-weight: 700;
}
.models h3 {
  font-size: 28px;
  margin: 22px 0 10px;
  font-weight: 600;
}
.models p {
  min-height: 54px;
  color: #91a7b8;
  font-size: 14px;
  line-height: 1.7;
}
.models ol {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: flow;
}
.models li {
  padding: 12px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 13px;
  color: #c4d4df;
}
.models li::before {
  counter-increment: flow;
  content: "0" counter(flow);
  margin-right: 14px;
  color: #4cc9ff;
  font-weight: 600;
}

/* Research map */
.research-map {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 60px;
  align-items: center;
  margin-top: 90px;
  padding-top: 70px;
  border-top: 1px solid var(--line-light);
}
.research-map img {
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}
.research-map h3 {
  font-size: 30px;
  margin: 18px 0 14px;
  font-weight: 600;
  line-height: 1.25;
}
.research-map div > p:last-child {
  color: #8fa6b8;
  line-height: 1.8;
  font-size: 15px;
}

/* Pivot */
.before-after {
  display: grid;
  grid-template-columns: 1fr 70px 1fr;
  align-items: stretch;
  margin-top: 70px;
  gap: 10px;
}
.before-after article {
  padding: 40px;
  border-radius: 20px;
}
.before {
  border: 1px solid #d7dde2;
  background: #eceff2;
}
.after {
  background: linear-gradient(145deg, #087dff, #04a9f4);
  color: #fff;
  box-shadow: 0 26px 70px rgba(7, 135, 255, 0.28);
}
.before-after small {
  font-size: 11px;
  letter-spacing: 0.16em;
  font-weight: 700;
  opacity: 0.8;
}
.before-after h3 {
  font-size: 24px;
  line-height: 1.45;
  margin: 36px 0 16px;
  font-weight: 600;
}
.before-after p {
  line-height: 1.7;
  color: #77828d;
  font-size: 15px;
}
.after p { color: #d9f2ff; }
.pivot-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  color: var(--blue);
}

/* Connection model redesign */
.connection-redesign {
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(0, 1.4fr);
  gap: 28px;
  margin-top: 70px;
}
.model-diagnosis,
.stage-model {
  border: 1px solid rgba(126, 193, 229, 0.16);
  border-radius: 24px;
  background: rgba(9, 32, 50, 0.68);
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.04);
}
.model-diagnosis { padding: 34px; }
.model-diagnosis > small,
.stage-model-head small,
.model-capabilities small {
  color: #4cc9ff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.model-diagnosis h3 {
  margin-top: 20px;
  font-size: clamp(22px, 2vw, 30px);
  line-height: 1.35;
  font-weight: 600;
}
.model-diagnosis ul { margin-top: 34px; }
.model-diagnosis li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  padding: 19px 0;
  border-top: 1px solid rgba(126, 193, 229, 0.12);
}
.model-diagnosis li i { color: #4cc9ff; font-size: 10px; font-style: normal; letter-spacing: 0.08em; }
.model-diagnosis li span { color: #8fa6b8; font-size: 13px; line-height: 1.65; }
.model-diagnosis li b { display: block; margin-bottom: 4px; color: #e7f4fb; font-size: 14px; }
.stage-model { padding: 22px; }
.stage-model-head { display: flex; align-items: center; justify-content: space-between; padding: 8px 8px 22px; }
.stage-model-head span { color: #7894a8; font-size: 11px; letter-spacing: 0.08em; }
.stage {
  display: grid;
  grid-template-columns: 36px minmax(180px, 1fr) minmax(180px, 0.9fr);
  gap: 18px;
  align-items: center;
  min-height: 138px;
  padding: 22px;
  border-top: 1px solid rgba(126, 193, 229, 0.12);
}
.stage-no { color: #4cc9ff; font-size: 11px; letter-spacing: 0.12em; }
.stage-copy b { display: block; color: #f4fbff; font-size: 17px; font-weight: 600; }
.stage-copy p { margin-top: 8px; color: #88a0b2; font-size: 13px; line-height: 1.65; }
.stage-visual {
  position: relative;
  min-height: 86px;
  border: 1px solid rgba(76, 201, 255, 0.16);
  border-radius: 16px;
  background: radial-gradient(circle at 50% 50%, rgba(19, 139, 216, 0.2), rgba(5, 23, 38, 0.5));
}
.device-focus { display: grid; place-items: center; }
.device-focus::before,
.device-focus::after { content: ""; position: absolute; border: 1px solid rgba(76, 201, 255, 0.16); border-radius: 50%; }
.device-focus::before { width: 58px; height: 58px; }
.device-focus::after { width: 82px; height: 82px; }
.device-focus i { z-index: 1; width: 22px; height: 15px; border: 2px solid #56d0ff; border-radius: 3px; }
.device-focus span { position: absolute; left: 12px; bottom: 10px; color: #d6f2ff; font-size: 10px; }
.device-focus em { position: absolute; right: 12px; top: 10px; color: #41e0a5; font-size: 9px; font-style: normal; }
.connect-track { display: flex; align-items: center; justify-content: center; gap: 12px; color: #c9eafa; font-size: 10px; }
.connect-track i { position: relative; width: 42%; height: 1px; background: linear-gradient(90deg, #4cc9ff, #41e0a5); }
.connect-track i::after { content: ""; position: absolute; right: 0; top: -4px; width: 9px; height: 9px; border-radius: 50%; background: #41e0a5; box-shadow: 0 0 14px #41e0a5; }
.connect-track em { font-style: normal; }
.capability-set { display: grid; grid-template-columns: repeat(3, 1fr); gap: 7px; align-content: center; padding: 12px; }
.capability-set span { padding: 10px 4px; border-radius: 9px; background: rgba(76, 201, 255, 0.1); color: #ccefff; font-size: 9px; text-align: center; }
.model-capabilities { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 28px; border-top: 1px solid rgba(126, 193, 229, 0.16); }
.model-capabilities article { padding: 28px 28px 0 0; }
.model-capabilities article + article { padding-left: 28px; border-left: 1px solid rgba(126, 193, 229, 0.12); }
.model-capabilities b { display: block; margin-top: 12px; color: #f0f9ff; font-size: 17px; }
.model-capabilities p { margin-top: 9px; color: #8ba3b5; font-size: 13px; line-height: 1.65; }

/* Cross-device semantic system */
.semantic-system { margin-top: 70px; }
.semantic-rail { padding: 28px; border: 1px solid var(--line); border-radius: 22px; background: #f7fafc; }
.semantic-rail-title { display: flex; align-items: flex-end; justify-content: space-between; }
.semantic-rail-title small { color: var(--blue); font-size: 10px; font-weight: 700; letter-spacing: 0.16em; }
.semantic-rail-title b { font-size: 15px; }
.semantic-rail ol { display: grid; grid-template-columns: repeat(5, 1fr); margin: 28px 0 0; padding: 0; list-style: none; }
.semantic-rail li { position: relative; padding-top: 22px; border-top: 2px solid var(--blue); list-style: none; }
.semantic-rail li::before { content: ""; position: absolute; top: -6px; left: 0; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 5px rgba(0, 145, 255, 0.08); }
.semantic-rail li:last-child::after { content: ""; position: absolute; top: -2px; right: 0; width: 2px; height: 2px; background: var(--blue); }
.semantic-rail li i, .semantic-rail li span, .semantic-rail li em { display: block; }
.semantic-rail li i { color: #95a4ae; font-size: 9px; font-style: normal; }
.semantic-rail li span { margin-top: 7px; font-size: 14px; font-weight: 650; }
.semantic-rail li em { margin-top: 3px; color: #87959f; font-size: 11px; font-style: normal; }
.semantic-devices { display: grid; grid-template-columns: 0.82fr 1fr 1.18fr; gap: 22px; margin-top: 24px; }
.semantic-device { display: flex; min-width: 0; flex-direction: column; padding: 20px; border: 1px solid var(--line); border-radius: 22px; background: #fff; box-shadow: 0 18px 50px rgba(28, 56, 81, 0.07); }
.semantic-device header { display: flex; align-items: center; justify-content: space-between; padding-bottom: 16px; }
.semantic-device header span { color: var(--blue); font-size: 11px; font-weight: 700; letter-spacing: 0.08em; }
.semantic-device header em { color: #8a98a2; font-size: 10px; font-style: normal; }
.semantic-preview { position: relative; overflow: hidden; height: clamp(300px, 24vw, 350px); min-height: 0; border-radius: 16px; background: #edf2f6; }
.semantic-preview img { display: block; width: 100%; height: 100%; object-fit: contain; }
.phone-preview { background: radial-gradient(circle at 50% 42%, #f8fbfd, #e5edf2 72%); }
.phone-preview img { width: auto; max-width: 100%; margin: 0 auto; object-position: center; box-shadow: 0 14px 32px rgba(27, 54, 76, 0.12); }
.phone-preview .preview-callout { left: auto; right: 12px; width: min(132px, 42%); }
.screen-preview { display: grid; place-items: center; padding: 18px; background: linear-gradient(145deg, #e9eff3, #dce6ec); }
.screen-preview img { border-radius: 9px; object-position: center; box-shadow: 0 14px 30px rgba(23, 50, 70, 0.13); }
.preview-callout { position: absolute; left: 12px; right: 12px; bottom: 12px; padding: 11px 13px; border-radius: 11px; background: rgba(5, 24, 39, 0.84); color: #fff; backdrop-filter: blur(10px); }
.preview-callout b, .preview-callout span { display: block; }
.preview-callout b { color: #59d1ff; font-size: 9px; letter-spacing: 0.1em; }
.preview-callout span { margin-top: 4px; font-size: 11px; }
.windows-preview { padding: 16px; background: linear-gradient(145deg, #e9f0f5, #dce8ef); color: #17354a; }
.win-bar { display: flex; justify-content: space-between; font-size: 10px; font-weight: 700; }
.win-bar em { color: var(--blue); font-style: normal; }
.win-modes { margin-top: 24px; padding: 16px; border-radius: 13px; background: #fff; }
.win-modes > b { font-size: 13px; }
.win-modes div { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-top: 12px; }
.win-modes span { padding: 9px 3px; border-radius: 8px; background: #eef3f6; color: #738795; font-size: 9px; text-align: center; }
.win-modes span.selected { background: #058df4; color: #fff; }
.win-file { display: grid; grid-template-columns: 34px 1fr auto; gap: 9px; align-items: center; margin-top: 10px; padding: 13px; border-radius: 12px; background: #fff; }
.win-file > i { display: grid; width: 32px; height: 32px; place-items: center; border-radius: 8px; background: #e5f4ff; color: var(--blue); font-size: 9px; font-style: normal; font-weight: 700; }
.win-file span b, .win-file span em { display: block; }
.win-file span b { font-size: 10px; }.win-file span em { margin-top: 2px; color: #8a9ba7; font-size: 8px; font-style: normal; }
.win-file strong { color: var(--blue); font-size: 9px; }
.device-duty { padding: 20px 2px 16px; }
.device-duty b { font-size: 16px; }.device-duty p { margin-top: 8px; color: #71808a; font-size: 12px; line-height: 1.65; }
.semantic-device ul { margin-top: auto; border-top: 1px solid var(--line); }
.semantic-device li { display: flex; justify-content: space-between; gap: 14px; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 10px; }
.semantic-device li span { color: #84939e; }.semantic-device li b { font-weight: 600; text-align: right; }
.semantic-rules { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 24px; border-top: 1px solid var(--line); }
.semantic-rules > div { display: grid; grid-template-columns: 30px 1fr; gap: 12px; padding: 26px 26px 0 0; }
.semantic-rules > div + div { padding-left: 26px; border-left: 1px solid var(--line); }
.semantic-rules i { color: var(--blue); font-size: 10px; font-style: normal; }.semantic-rules span { color: #71808a; font-size: 12px; line-height: 1.65; }.semantic-rules b { display: block; margin-bottom: 5px; color: var(--ink); font-size: 14px; }

/* Large-screen shared state center */
.shared-center-demo { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.55fr); gap: 28px; margin-top: 70px; align-items: stretch; }
.shared-screen { position: relative; overflow: hidden; min-height: 560px; border: 1px solid rgba(255,255,255,.14); border-radius: 24px; background: #cfd5dc; box-shadow: 0 34px 90px rgba(0,0,0,.32); }
.shared-screen > img { width: 100%; height: 100%; object-fit: cover; opacity: .72; filter: saturate(.82); }
.shared-screen::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5,19,31,.12), rgba(5,19,31,.02)); pointer-events: none; }
.shared-screen-label { position: absolute; z-index: 3; left: 22px; right: 22px; top: 20px; display: flex; justify-content: space-between; color: #17364b; font-size: 11px; font-weight: 700; }
.shared-screen-label b { display: flex; align-items: center; gap: 7px; }.shared-screen-label i { width: 7px; height: 7px; border-radius: 50%; background: #20cf91; box-shadow: 0 0 12px #20cf91; }
.shared-state { position: absolute; z-index: 4; left: 7%; bottom: 7%; width: min(430px, 72%); padding: 24px; border: 1px solid rgba(255,255,255,.66); border-radius: 18px; background: rgba(255,255,255,.92); color: #183449; box-shadow: 0 18px 50px rgba(20,53,76,.2); opacity: 0; transform: translateY(14px); animation: shared-state-cycle 16s infinite; }
.shared-state small, .shared-state strong, .shared-state p { display: block; }.shared-state small { color: #058df4; font-size: 9px; font-weight: 700; letter-spacing: .12em; }.shared-state strong { margin-top: 10px; font-size: 22px; }.shared-state p { margin-top: 7px; color: #6f8391; font-size: 12px; line-height: 1.55; }.shared-state > div { display: flex; gap: 8px; margin-top: 18px; }.shared-state > div span, .shared-state > div em { padding: 8px 10px; border-radius: 8px; background: #eaf5fd; color: #087fcf; font-size: 10px; font-style: normal; }
.shared-state-check { animation-delay: 4s; }.shared-state-ready { animation-delay: 8s; }.shared-state-casting { animation-delay: 12s; }
.shared-loader i { width: 8px; height: 8px; border-radius: 50%; background: #058df4; animation: shared-loader 1s ease-in-out infinite alternate; }.shared-loader i:nth-child(2){animation-delay:.2s}.shared-loader i:nth-child(3){animation-delay:.4s}
@keyframes shared-state-cycle { 0%, 21% { opacity: 1; transform: none; } 25%, 100% { opacity: 0; transform: translateY(14px); } }
@keyframes shared-loader { to { opacity: .25; transform: translateY(-3px); } }
.shared-center-steps { display: grid; grid-template-rows: repeat(4, 1fr); border-top: 1px solid rgba(255,255,255,.15); }
.shared-center-steps li { display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-content: center; padding: 20px 0; border-bottom: 1px solid rgba(255,255,255,.15); }
.shared-center-steps i { color: #4cc9ff; font-size: 10px; font-style: normal; }.shared-center-steps b, .shared-center-steps em { display: block; }.shared-center-steps b { color: #edf8ff; font-size: 14px; }.shared-center-steps em { margin-top: 6px; color: #829bad; font-size: 11px; font-style: normal; line-height: 1.55; }
.shared-center-note { display: flex; justify-content: space-between; gap: 40px; margin-top: 28px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.14); }.shared-center-note span { color: #4cc9ff; font-size: 11px; letter-spacing: .08em; }.shared-center-note p { max-width: 720px; color: #8da5b8; font-size: 13px; line-height: 1.7; }

/* Delivery */
.acceptance-system { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(280px, .55fr); gap: 24px; margin-top: 70px; }
.acceptance-matrix, .acceptance-record { border: 1px solid var(--line); border-radius: 20px; background: #fff; overflow: hidden; }
.acceptance-title, .record-head { display: flex; justify-content: space-between; gap: 20px; padding: 20px 22px; border-bottom: 1px solid var(--line); }
.acceptance-title span, .record-head span { font-size: 14px; font-weight: 700; }.acceptance-title small, .record-head b { color: #8997a1; font-size: 9px; letter-spacing: .08em; }
.matrix-row { display: grid; grid-template-columns: 1.05fr repeat(5, 1fr); min-width: 720px; border-bottom: 1px solid var(--line); }.matrix-row:last-child{border-bottom:0}
.matrix-row > * { padding: 17px 12px; border-right: 1px solid var(--line); }.matrix-row > *:last-child{border-right:0}
.matrix-row b { font-size: 12px; }.matrix-row b em { display:block; margin-top:4px; color:#8998a3; font-size:9px; font-style:normal; font-weight:400; }.matrix-row span { position:relative; padding-left:27px; color:#6f808c; font-size:10px; line-height:1.4; }.matrix-row span::before{content:"";position:absolute;left:11px;top:18px;width:8px;height:8px;border-radius:50%;background:#19c98b;box-shadow:0 0 0 4px rgba(25,201,139,.1)}
.matrix-head { background:#f6f9fb; }.matrix-head > * { color:#82909a; font-size:9px; font-weight:700; letter-spacing:.06em; }.matrix-head span{padding-left:12px}.matrix-head span::before{display:none}
.acceptance-record { padding-bottom: 18px; }.record-problem { padding: 24px 22px; }.record-problem small{color:var(--blue);font-size:9px;letter-spacing:.08em}.record-problem strong{display:block;margin-top:10px;font-size:18px}.record-problem p{margin-top:8px;color:#74838e;font-size:11px;line-height:1.6}
.acceptance-record dl { margin:0 22px; border-top:1px solid var(--line); }.acceptance-record dl div{display:flex;justify-content:space-between;gap:12px;padding:11px 0;border-bottom:1px solid var(--line);font-size:10px}.acceptance-record dt{color:#87959f}.acceptance-record dd{font-weight:600}.acceptance-record dd i{display:inline-block;width:7px;height:7px;margin-right:6px;border-radius:50%;background:#ff6b5f}.acceptance-record dd.pass{color:#0ba875}
.record-notes{margin:16px 22px 0;padding:14px;border-radius:12px;background:#eef7fd}.record-notes span{color:var(--blue);font-size:9px;font-weight:700}.record-notes p{margin-top:5px;color:#587080;font-size:10px;line-height:1.55}
.acceptance-loop{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr;gap:14px;align-items:center;margin-top:24px;padding:22px;border:1px solid var(--line);border-radius:18px;background:#fff}.acceptance-loop>div{display:grid;grid-template-columns:26px 1fr;gap:8px}.acceptance-loop i{color:var(--blue);font-size:9px;font-style:normal}.acceptance-loop b,.acceptance-loop em{display:block}.acceptance-loop b{font-size:12px}.acceptance-loop em{margin-top:4px;color:#8897a2;font-size:9px;font-style:normal;line-height:1.45}.acceptance-loop>strong{color:var(--blue);font-weight:400}
.acceptance-evidence{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:24px}.acceptance-evidence article{padding:22px;border-radius:16px;background:#e9eef2}.acceptance-evidence small{color:#7c8b96;font-size:9px;letter-spacing:.06em}.acceptance-evidence b{display:block;margin-top:14px;font-size:15px;line-height:1.4}.acceptance-evidence p{margin-top:8px;color:#72818c;font-size:11px;line-height:1.6}.acceptance-evidence .acceptance-result{background:#0a8ff2;color:#fff}.acceptance-result small,.acceptance-result p{color:rgba(255,255,255,.72)}.acceptance-result strong{display:block;margin-top:12px;font-size:42px;line-height:1}

/* Impact */
.impact-summary{display:grid;grid-template-columns:repeat(4,1fr);margin-top:60px;border-top:1px solid rgba(255,255,255,.16);border-bottom:1px solid rgba(255,255,255,.16)}.impact-summary>div{display:flex;gap:16px;align-items:center;padding:24px}.impact-summary>div+div{border-left:1px solid rgba(255,255,255,.13)}.impact-summary strong{color:#4cc9ff;font-size:34px}.impact-summary span b,.impact-summary span em{display:block}.impact-summary span b{font-size:12px}.impact-summary span em{margin-top:4px;color:#718ba0;font-size:9px;font-style:normal}
.capability-map{display:grid;grid-template-columns:1.15fr 1fr 1fr;gap:1px;margin-top:28px;border:1px solid rgba(255,255,255,.14);border-radius:20px;overflow:hidden;background:rgba(255,255,255,.12)}.capability-map>*{background:#071a2a}.capability-core{grid-row:span 2;padding:34px;background:radial-gradient(circle at 20% 20%,rgba(12,143,241,.25),#071a2a 62%)}.capability-core small{color:#4cc9ff;font-size:9px;letter-spacing:.12em}.capability-core strong{display:block;margin-top:22px;font-size:24px;line-height:1.35}.capability-core p{margin-top:14px;color:#8fa6b8;font-size:12px;line-height:1.65}.capability-map article{display:grid;grid-template-columns:30px 1fr;gap:12px;padding:26px}.capability-map article i{color:#4cc9ff;font-size:10px;font-style:normal}.capability-map article b,.capability-map article em{display:block}.capability-map article b{font-size:15px}.capability-map article em{margin-top:8px;color:#879eb0;font-size:10px;font-style:normal;line-height:1.65}
.value-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:28px}.value-grid article{padding:24px;border-top:2px solid #149dea;background:rgba(255,255,255,.045)}.value-grid small{color:#4cc9ff;font-size:9px;letter-spacing:.1em}.value-grid b{display:block;margin-top:16px;font-size:16px;line-height:1.4}.value-grid p{margin-top:9px;color:#8aa2b4;font-size:11px;line-height:1.65}
.value-sources{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:24px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:10px}.value-sources span{color:#718da2}.value-sources a{color:#61cfff;text-decoration:none}.value-sources a:hover{text-decoration:underline}

.impact-statement {
  margin-top: 80px;
  font-size: clamp(28px, 3.8vw, 52px);
  line-height: 1.35;
  letter-spacing: -0.03em;
  max-width: 900px;
}
.impact-statement span { color: #52c9ff; }

/* Footer */
footer {
  padding: 46px max(6vw, calc((100vw - var(--max)) / 2));
  background: #040b12;
  color: #fff;
}
footer a {
  color: #63c9ff;
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
}
footer a:hover { text-decoration: underline; }

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.85s cubic-bezier(0.16, 1, 0.3, 1), transform 0.85s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 1100px) {
  .hero { grid-template-columns: minmax(0, 48%) minmax(0, 1fr); column-gap: 2%; }
  .semantic-devices { grid-template-columns: 1fr 1fr; }
  .screen-semantic { grid-column: 1 / -1; }
  .acceptance-evidence { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .boe-share-brand { top: 22px; left: 76px; }
  .chapter-nav {
    top: 62px;
    right: 16px;
    width: calc(100% - 32px);
    justify-content: flex-start;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .chapter-nav::-webkit-scrollbar { display: none; }
  .chapter-nav a { flex: 0 0 auto; min-height: 32px; padding: 0 12px; }
  .progress { display: none; }
  .back { top: 16px; left: 16px; }

  .hero {
    display: flex;
    min-height: auto;
    padding: 120px 6vw 90px;
    align-items: flex-start;
    flex-direction: column;
  }
  .hero-copy { width: 100%; }
  .hero h1 { font-size: clamp(44px, 11vw, 72px); }
  .hero-collab {
    position: relative;
    width: 100%;
    right: auto;
    top: auto;
    transform: none;
    margin-top: 60px;
  }
  .hero-orbit { display: none; }
  .meta { gap: clamp(18px, 5vw, 36px); margin-top: 48px; }

  .chapter { padding: 100px 6vw; }
  .chapter-head h2 { font-size: clamp(30px, 8vw, 48px); }

  .complexity { grid-template-columns: 1fr 1fr; gap: 0 20px; }
  .complexity article { border-right: 0; padding: 28px 20px; min-height: auto; }

  .research-map { grid-template-columns: 1fr; gap: 32px; }

  .models,
  .connection-redesign { grid-template-columns: 1fr; }
  .model-capabilities { grid-template-columns: 1fr; }
  .model-capabilities article + article { padding-left: 0; border-left: 0; }
  .semantic-devices,
  .shared-center-demo,
  .acceptance-system { grid-template-columns: 1fr; }
  .screen-semantic { grid-column: auto; }
  .semantic-rules { grid-template-columns: 1fr; }
  .semantic-rules > div + div { padding-left: 0; border-left: 0; }
  .shared-screen { min-height: 480px; }
  .shared-center-steps { grid-template-columns: 1fr 1fr; grid-template-rows: none; }
  .acceptance-matrix { overflow-x: auto; }
  .acceptance-loop { grid-template-columns: 1fr 1fr; }
  .acceptance-loop > strong { display: none; }
  .impact-summary { grid-template-columns: 1fr 1fr; }
  .impact-summary > div:nth-child(3) { border-left: 0; border-top: 1px solid rgba(255,255,255,.13); }
  .impact-summary > div:nth-child(4) { border-top: 1px solid rgba(255,255,255,.13); }
  .capability-map { grid-template-columns: 1fr 1fr; }
  .capability-core { grid-column: 1 / -1; grid-row: auto; }

  .journey { grid-template-columns: 1fr 1fr; gap: 40px 24px; }
  .journey-line { display: none; }

  .before-after { grid-template-columns: 1fr; }
  .pivot-arrow { padding: 18px; transform: rotate(90deg); }

  .evidence figcaption { flex-direction: column; gap: 8px; }
}

@media (max-width: 560px) {
  .boe-share-brand { left: 5vw; }
  .chapter { padding: 80px 5vw; }
  .hero { padding: 110px 5vw 70px; }
  .hero h1 { font-size: 44px; }
  .hero-collab { margin-top: 48px; }
  .meta { gap: 16px; }
  .meta b { font-size: 13px; }

  .complexity,
  .journey { grid-template-columns: 1fr; }
  .stage { grid-template-columns: 28px 1fr; }
  .stage-visual { grid-column: 2; }
  .semantic-rail { overflow-x: auto; }
  .semantic-rail ol { min-width: 560px; }
  .semantic-devices,
  .semantic-rules,
  .shared-center-steps,
  .acceptance-loop,
  .acceptance-evidence,
  .impact-summary,
  .capability-map,
  .value-grid { grid-template-columns: 1fr; }
  .shared-screen { min-height: 420px; }
  .shared-state { width: 86%; padding: 18px; }
  .shared-center-note { flex-direction: column; gap: 10px; }
  .acceptance-loop > strong { display: none; }
  .impact-summary > div + div { border-left: 0; border-top: 1px solid rgba(255,255,255,.13); }
  .capability-core { grid-column: auto; }

  .before-after article { padding: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-orbit { animation: none; }
  .shared-state { animation: none; opacity: 0; transform: none; }
  .shared-state-ready { opacity: 1; }
  .shared-loader i { animation: none; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .progress i { transition: none; }
}