:root {
  --crypto: #8ea7ff;
  --ai: #6ee7c7;
  --computer: #e3b86d;
  --history: #d89b63;
}

body .site.is-wide { max-width: 1120px; }
.learn-shell { margin-top: 10px; }
.nav { scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }

.learn-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
  margin-bottom: 22px;
}

.learn-search { position: relative; }
.learn-search svg {
  position: absolute;
  left: 16px;
  top: 50%;
  width: 16px;
  height: 16px;
  color: var(--fg-mid);
  transform: translateY(-50%);
  pointer-events: none;
}

.learn-search input {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0 16px 0 44px;
  background: rgba(19, 18, 16, .86);
  color: var(--accent);
  font: 400 13px/1 var(--font-sans);
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.learn-search input:focus {
  border-color: var(--domain-color, var(--gold-dim));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--domain-color, var(--gold)) 12%, transparent);
}

.learn-count {
  min-width: 112px;
  color: var(--fg-mid);
  font-size: 11px;
  letter-spacing: .12em;
  text-align: right;
  text-transform: uppercase;
}

.learn-filters {
  display: flex;
  gap: 8px;
  margin: -4px 0 24px;
  padding-bottom: 4px;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--domain-color) 30%, var(--border)) transparent;
}

.learn-filters::-webkit-scrollbar { height: 4px; }
.learn-filters::-webkit-scrollbar-track { background: transparent; }
.learn-filters::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: color-mix(in srgb, var(--domain-color) 30%, var(--border));
}

.filter-pill {
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 12px;
  background: transparent;
  color: var(--fg-mid);
  font: 500 10px/1 var(--font-sans);
  letter-spacing: .09em;
  text-transform: uppercase;
  cursor: pointer;
}

.filter-pill:hover,
.filter-pill.active {
  border-color: color-mix(in srgb, var(--domain-color) 55%, var(--border));
  background: color-mix(in srgb, var(--domain-color) 9%, transparent);
  color: var(--domain-color);
}

.learn-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.lesson-card {
  position: relative;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 14px;
  background:
    radial-gradient(circle at 90% 0%, color-mix(in srgb, var(--domain-color) 10%, transparent), transparent 35%),
    var(--bg2);
  overflow: hidden;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 220ms cubic-bezier(.2,.8,.2,1), border-color 220ms ease, box-shadow 220ms ease;
}

.lesson-card:hover {
  border-color: color-mix(in srgb, var(--domain-color) 45%, var(--border));
  box-shadow: 0 22px 50px rgba(0, 0, 0, .28);
  transform: translateY(-5px) rotateX(1.2deg);
}

.lesson-card:focus-visible {
  outline: 2px solid var(--domain-color);
  outline-offset: 3px;
}

.lesson-thumb {
  position: relative;
  height: 156px;
  background: #090908;
  overflow: hidden;
}

.lesson-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 52%, rgba(13, 12, 11, .72));
  pointer-events: none;
}

.lesson-thumb img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  opacity: .82;
  transition: opacity 220ms ease, transform 500ms cubic-bezier(.2,.8,.2,1);
}

.lesson-card:hover .lesson-thumb img { opacity: 1; transform: scale(1.045); }

.lesson-text-preview {
  position: relative;
  display: flex;
  min-height: 156px;
  align-items: flex-end;
  padding: 22px;
  background:
    linear-gradient(145deg, color-mix(in srgb, var(--domain-color) 13%, transparent), transparent 58%),
    repeating-linear-gradient(90deg, transparent 0 31px, rgba(255,255,255,.018) 32px),
    #090908;
  overflow: hidden;
}

.lesson-text-preview::after {
  content: '';
  position: absolute;
  right: -36px;
  bottom: -54px;
  width: 150px;
  height: 150px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 18%, transparent);
  border-radius: 50%;
}

.lesson-text-preview strong {
  position: relative;
  z-index: 1;
  max-width: 88%;
  color: var(--accent);
  font: 700 clamp(26px, 3vw, 42px)/.95 var(--font-serif);
  letter-spacing: -.035em;
  overflow-wrap: anywhere;
}

.lesson-text-preview small {
  position: absolute;
  z-index: 1;
  top: 18px;
  right: 18px;
  max-width: 55%;
  color: var(--domain-color);
  font-size: 8px;
  letter-spacing: .12em;
  text-align: right;
  text-transform: uppercase;
}

.lesson-number {
  position: absolute;
  z-index: 1;
  top: 12px;
  left: 12px;
  min-width: 34px;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 999px;
  padding: 5px 8px;
  background: rgba(9, 9, 8, .7);
  color: rgba(255, 255, 255, .68);
  font-size: 9px;
  letter-spacing: .1em;
  text-align: center;
  backdrop-filter: blur(8px);
}

.lesson-card-body { min-height: 130px; padding: 18px; }
.lesson-category {
  display: block;
  margin-bottom: 8px;
  color: var(--domain-color);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .15em;
  text-transform: uppercase;
}

.lesson-card-title { color: var(--accent); font: 500 18px/1.25 var(--font-serif); }
.lesson-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 18px;
  color: var(--fg-dim);
  font-size: 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.lesson-card-arrow { color: var(--domain-color); font-size: 15px; transition: transform 180ms ease; }
.lesson-card:hover .lesson-card-arrow { transform: translateX(4px); }
.learn-empty {
  grid-column: 1 / -1;
  border: 1px dashed var(--border);
  border-radius: 12px;
  padding: 54px 24px;
  color: var(--fg-mid);
  text-align: center;
}

.lesson-page { --domain-color: var(--gold); }
.lesson-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 34px;
}

.lesson-back { margin: 0; }
.lesson-progress {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--fg-dim);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.progress-line {
  width: 72px;
  height: 2px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}

.progress-line span {
  display: block;
  width: var(--progress, 0%);
  height: 100%;
  border-radius: inherit;
  background: var(--domain-color);
}

.lesson-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, .95fr);
  gap: 42px;
  align-items: center;
  min-height: 410px;
  margin-bottom: 64px;
}

.lesson-hero.is-simple {
  display: block;
  min-height: 0;
  max-width: 860px;
  margin: 76px 0 72px;
}

.lesson-hero.is-simple .lesson-title { max-width: 820px; }
.lesson-hero.is-simple .lesson-summary { max-width: 760px; }

.lesson-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  color: var(--domain-color);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.lesson-kicker::before { content: ''; width: 24px; height: 1px; background: currentColor; }
.lesson-title {
  max-width: 630px;
  color: var(--accent);
  font: 700 clamp(38px, 6vw, 70px)/.98 var(--font-serif);
  letter-spacing: -.04em;
}

.lesson-summary { max-width: 570px; margin-top: 22px; color: var(--fg-mid); font-size: 14px; line-height: 1.8; }
.lesson-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.meta-chip {
  border: 1px solid color-mix(in srgb, var(--domain-color) 24%, var(--border));
  border-radius: 999px;
  padding: 6px 10px;
  background: color-mix(in srgb, var(--domain-color) 6%, transparent);
  color: color-mix(in srgb, var(--domain-color) 72%, var(--fg));
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.lesson-tools {
  display: flex;
  align-items: center;
  gap: 14px;
}

.learn-lang-toggle {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--domain-color) 28%, var(--border));
  border-radius: 999px;
  background: var(--bg2);
}

.learn-lang-toggle button {
  min-width: 42px;
  border: 0;
  padding: 9px 12px;
  background: transparent;
  color: var(--fg-mid);
  font: 600 9px/1 var(--font-sans);
  letter-spacing: .12em;
  cursor: pointer;
}

.learn-lang-toggle button.active {
  background: color-mix(in srgb, var(--domain-color) 16%, transparent);
  color: var(--domain-color);
}

.learn-article {
  max-width: 1180px;
  margin: 70px 0 52px;
}

.article-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  gap: 30px;
  align-items: end;
  max-width: 1180px;
  margin-bottom: 38px;
}

.article-subtitle {
  max-width: 760px;
  margin-top: 20px;
  color: var(--accent);
  font: 400 clamp(18px, 2vw, 25px)/1.5 var(--font-serif);
}

.article-summary {
  max-width: 820px;
  margin-top: 24px;
  color: color-mix(in srgb, var(--fg-mid) 88%, var(--accent));
  font-size: clamp(15px, 1.6vw, 19px);
  line-height: 1.85;
}

.article-hero-image {
  border: 1px solid color-mix(in srgb, var(--domain-color) 22%, var(--border));
  border-radius: 18px;
  padding: 10px;
  background:
    radial-gradient(circle at 80% 0%, color-mix(in srgb, var(--domain-color) 12%, transparent), transparent 42%),
    #080807;
  overflow: hidden;
}

.article-hero-image img {
  display: block;
  width: 100%;
  max-height: 360px;
  border-radius: 11px;
  object-fit: cover;
  object-position: top center;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.article-block {
  border: 1px solid color-mix(in srgb, var(--domain-color) 18%, var(--border));
  border-radius: 18px;
  padding: 26px;
  background:
    radial-gradient(circle at 100% 0%, color-mix(in srgb, var(--domain-color) 7%, transparent), transparent 40%),
    linear-gradient(145deg, rgba(255,255,255,.025), transparent),
    var(--bg2);
}

.article-block:nth-child(1),
.article-block:nth-child(3),
.article-sources,
.article-quiz {
  grid-column: 1 / -1;
}

.article-block-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.article-block-head span {
  color: var(--domain-color);
  font-size: 10px;
  letter-spacing: .14em;
}

.article-block-head h2 {
  color: var(--accent);
  font: 500 clamp(22px, 2.4vw, 34px)/1.15 var(--font-serif);
}

.article-copy {
  display: grid;
  gap: 13px;
  color: var(--fg-mid);
  font-size: 14px;
  line-height: 1.9;
}

.article-copy p {
  max-width: 900px;
}

.article-copy ul {
  display: grid;
  gap: 11px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-copy li {
  position: relative;
  padding-left: 18px;
}

.article-copy li::before {
  content: '';
  position: absolute;
  top: .75em;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--domain-color);
  box-shadow: 0 0 12px color-mix(in srgb, var(--domain-color) 55%, transparent);
}

.article-sources a {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  color: var(--fg-mid);
  text-decoration: none;
}

.article-sources a:hover { color: var(--domain-color); }
.article-sources a b { color: var(--domain-color); font-weight: 400; }
.article-source-note { margin-top: 10px; color: var(--fg-dim); font-size: 11px; line-height: 1.7; }

.article-quiz details {
  border: 1px solid var(--border);
  border-radius: 13px;
  padding: 15px 16px;
  background: rgba(0,0,0,.12);
}

.article-quiz summary {
  display: flex;
  gap: 12px;
  align-items: baseline;
  color: var(--accent);
  cursor: pointer;
  font: 500 14px/1.55 var(--font-sans);
}

.article-quiz summary span {
  color: var(--domain-color);
  font-size: 10px;
  letter-spacing: .12em;
}

.article-quiz details p {
  margin: 13px 0 0 31px;
  color: var(--fg-mid);
  font-size: 13px;
  line-height: 1.75;
}

.article-visual-section {
  margin-top: 10px;
}

.article-gallery-section {
  margin-top: 10px;
}

.article-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.concept-scene { position: relative; min-height: 360px; perspective: 900px; isolation: isolate; }
.scene-glow {
  position: absolute;
  z-index: -1;
  inset: 16% 10%;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--domain-color) 22%, transparent), transparent 65%);
  filter: blur(20px);
}

.scene-grid {
  position: absolute;
  left: 8%;
  right: 8%;
  bottom: 5%;
  height: 46%;
  border: 1px solid color-mix(in srgb, var(--domain-color) 20%, transparent);
  background:
    linear-gradient(color-mix(in srgb, var(--domain-color) 13%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--domain-color) 13%, transparent) 1px, transparent 1px);
  background-size: 28px 28px;
  transform: rotateX(68deg);
  transform-origin: center bottom;
  mask-image: linear-gradient(to top, #000, transparent);
}

.scene-orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 290px;
  height: 118px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 30%, transparent);
  border-radius: 50%;
  transform: translate(-50%, -50%) rotateX(66deg) rotateZ(-8deg);
  animation: orbit-drift 9s ease-in-out infinite alternate;
}

.scene-orbit::before,
.scene-orbit::after {
  content: '';
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--domain-color);
  box-shadow: 0 0 18px var(--domain-color);
}

.scene-orbit::before { top: 19px; right: 26px; }
.scene-orbit::after { bottom: 11px; left: 45px; animation: pulse-dot 1.8s ease-in-out infinite; }
.scene-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 142px;
  height: 142px;
  transform-style: preserve-3d;
  transform: translate(-50%, -50%) rotateX(-15deg) rotateY(28deg);
  animation: core-float 6s ease-in-out infinite;
}

.scene-face {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--domain-color) 50%, transparent);
  background: linear-gradient(135deg, color-mix(in srgb, var(--domain-color) 22%, #111), rgba(13, 12, 11, .88));
  color: var(--accent);
  font: 700 26px/1 var(--font-serif);
  letter-spacing: -.04em;
  text-align: center;
  text-shadow: 0 2px 18px rgba(0, 0, 0, .7);
  box-shadow: inset 0 0 30px rgba(255, 255, 255, .025);
}

.scene-face.front { transform: translateZ(71px); }
.scene-face.back { transform: rotateY(180deg) translateZ(71px); }
.scene-face.right { transform: rotateY(90deg) translateZ(71px); }
.scene-face.left { transform: rotateY(-90deg) translateZ(71px); }
.scene-face.top { transform: rotateX(90deg) translateZ(71px); }
.scene-face.bottom { transform: rotateX(-90deg) translateZ(71px); }

.scene-chip {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 26%, var(--border));
  border-radius: 8px;
  padding: 8px 10px;
  background: rgba(13, 12, 11, .82);
  color: var(--fg-mid);
  font-size: 9px;
  letter-spacing: .1em;
  text-transform: uppercase;
  backdrop-filter: blur(10px);
  animation: chip-float 5s ease-in-out infinite;
}

.scene-chip::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--domain-color);
  box-shadow: 0 0 10px var(--domain-color);
}

.scene-chip.one { top: 14%; left: 2%; }
.scene-chip.two { top: 23%; right: 0; animation-delay: -1.6s; }
.scene-chip.three { bottom: 13%; left: 5%; animation-delay: -3s; }

@keyframes core-float {
  0%, 100% { transform: translate(-50%, -50%) rotateX(-15deg) rotateY(28deg) translateY(0); }
  50% { transform: translate(-50%, -50%) rotateX(-10deg) rotateY(50deg) translateY(-10px); }
}

@keyframes orbit-drift {
  from { transform: translate(-50%, -50%) rotateX(66deg) rotateZ(-8deg); }
  to { transform: translate(-50%, -50%) rotateX(61deg) rotateZ(9deg); }
}

@keyframes pulse-dot { 50% { opacity: .35; transform: scale(.65); } }
@keyframes chip-float { 50% { transform: translateY(-7px); } }

.lesson-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(280px, .82fr);
  gap: 28px;
  align-items: start;
}

.lesson-section { margin-bottom: 48px; }
.lesson-section-heading { display: flex; align-items: baseline; gap: 14px; margin-bottom: 20px; }
.lesson-section-number { color: var(--domain-color); font-size: 10px; letter-spacing: .12em; }
.lesson-section-title { color: var(--accent); font: 500 26px/1.2 var(--font-serif); }

.topic-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.topic-narrative {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(260px, .75fr);
  gap: 14px;
  margin-bottom: 14px;
}

.topic-narrative-copy,
.topic-key-points,
.history-timeline {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 26px;
  background:
    radial-gradient(circle at 100% 0%, color-mix(in srgb, var(--domain-color) 8%, transparent), transparent 40%),
    var(--bg2);
}

.topic-narrative-copy h2,
.history-timeline h3 {
  color: var(--accent);
  font: 500 27px/1.2 var(--font-serif);
}

.topic-narrative-copy p {
  max-width: 760px;
  margin-top: 16px;
  color: var(--fg-mid);
  font-size: 13px;
  line-height: 1.9;
}

.topic-key-points ul {
  display: grid;
  gap: 13px;
  list-style: none;
}

.topic-key-points li {
  position: relative;
  border-bottom: 1px solid var(--border);
  padding: 0 0 13px 18px;
  color: var(--fg-mid);
  font-size: 11px;
  line-height: 1.65;
}

.topic-key-points li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.topic-key-points li::before {
  content: '';
  position: absolute;
  top: .58em;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--domain-color);
  box-shadow: 0 0 10px color-mix(in srgb, var(--domain-color) 65%, transparent);
}

.history-timeline {
  grid-column: 1 / -1;
}

.history-timeline-head {
  display: grid;
  grid-template-columns: minmax(0, .8fr) minmax(280px, 1.2fr);
  gap: 10px 28px;
  align-items: end;
  margin-bottom: 24px;
}

.history-timeline-head .topic-fact-kicker {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

.history-timeline-head p {
  color: var(--fg-mid);
  font-size: 10px;
  line-height: 1.65;
}

.history-timeline ol {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  list-style: none;
}

.history-timeline li {
  position: relative;
  min-width: 0;
  border-top: 1px solid color-mix(in srgb, var(--domain-color) 35%, var(--border));
  padding: 20px 16px 0 0;
}

.history-timeline li::before {
  content: '';
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--domain-color);
}

.history-timeline time {
  display: block;
  color: var(--domain-color);
  font: 500 15px/1.2 var(--font-serif);
}

.history-timeline li p {
  margin-top: 10px;
  color: var(--fg-mid);
  font-size: 9px;
  line-height: 1.65;
}

.topic-facts > article,
.topic-sources {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  background:
    radial-gradient(circle at 100% 0%, color-mix(in srgb, var(--domain-color) 7%, transparent), transparent 38%),
    var(--bg2);
}

.topic-fact-kicker {
  display: block;
  margin-bottom: 12px;
  color: var(--domain-color);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.topic-facts h2,
.topic-sources h2 {
  color: var(--accent);
  font: 500 22px/1.2 var(--font-serif);
}

.topic-facts p {
  margin-top: 14px;
  color: var(--fg-mid);
  font-size: 12px;
  line-height: 1.75;
}

.topic-facts ul,
.topic-sources ul {
  display: grid;
  gap: 13px;
  list-style: none;
}

.topic-facts li {
  display: grid;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.topic-facts li:last-child { border-bottom: 0; padding-bottom: 0; }
.topic-facts li strong { color: var(--accent); font-size: 11px; }
.topic-facts li span { color: var(--fg-mid); font-size: 11px; line-height: 1.6; }

.topic-sources-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 22px;
}

.topic-sources a {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  color: var(--fg-mid);
  font-size: 11px;
  text-decoration: none;
}

.topic-sources a:hover { color: var(--domain-color); }
.topic-sources a b { color: var(--domain-color); font-weight: 400; }

.visual-gallery {
  display: grid;
  gap: 18px;
}

.visual-frame {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  background: #080807;
  overflow: hidden;
}

.visual-image-button {
  position: relative;
  display: block;
  width: 100%;
  border: 0;
  padding: 0;
  background: transparent;
  cursor: zoom-in;
}

.visual-frame img {
  display: block;
  width: 100%;
  max-height: 720px;
  border-radius: 8px;
  object-fit: contain;
  background: #0a0a09;
}

.visual-expand {
  position: absolute;
  right: 12px;
  bottom: 12px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px;
  padding: 8px 11px;
  background: rgba(5,5,5,.82);
  color: #fff;
  font-size: 8px;
  letter-spacing: .1em;
  text-transform: uppercase;
  backdrop-filter: blur(8px);
  transition: border-color 160ms ease, color 160ms ease;
}
.visual-image-button:hover .visual-expand,
.visual-image-button:focus-visible .visual-expand { border-color: var(--domain-color); color: var(--domain-color); }

.visual-caption {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 11px 4px 1px;
  color: var(--fg-dim);
  font-size: 9px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.visual-caption span:last-child {
  overflow-wrap: anywhere;
  text-align: right;
}

.visual-caption.is-stacked {
  display: grid;
  justify-content: initial;
  gap: 4px;
  padding: 13px 5px 4px;
  text-transform: none;
}

.visual-caption.is-stacked > span {
  color: var(--domain-color);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.visual-caption.is-stacked strong {
  color: var(--accent);
  font: 500 16px/1.25 var(--font-serif);
}

.visual-caption.is-stacked p {
  max-width: 850px;
  color: var(--fg-mid);
  font-size: 10px;
  line-height: 1.65;
}

body.viewer-open { overflow: hidden; }
.image-viewer {
  position: fixed;
  z-index: 2000;
  inset: 0;
  display: none;
  padding: 24px;
}
.image-viewer.is-open { display: grid; place-items: center; }
.image-viewer-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.9); backdrop-filter: blur(12px); }
.image-viewer-panel {
  position: relative;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  width: min(96vw, 1700px);
  height: 94vh;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 16px;
  background: #080807;
  box-shadow: 0 28px 90px rgba(0,0,0,.65);
  overflow: hidden;
}
.image-viewer-panel header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--border);
  padding: 13px 16px;
}
.image-viewer-panel header span { color: var(--fg-dim); font-size: 8px; letter-spacing: .12em; text-transform: uppercase; }
.image-viewer-panel h2 { margin-top: 3px; color: var(--accent); font: 500 17px/1.15 var(--font-serif); }
.image-viewer-actions { display: flex; align-items: center; gap: 6px; }
.image-viewer-actions button {
  min-width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg2);
  color: var(--fg-mid);
  font: 500 10px/1 var(--font-sans);
  cursor: pointer;
}
.image-viewer-actions [data-viewer-reset] { min-width: 55px; }
.image-viewer-actions button:hover { border-color: var(--domain-color, var(--accent)); color: var(--accent); }
.image-viewer-actions .image-viewer-close { margin-left: 8px; color: #fff; }
.image-viewer-stage {
  display: grid;
  place-items: start center;
  overflow: auto;
  padding: 22px;
}
.image-viewer-stage img {
  display: block;
  width: auto;
  max-width: 100%;
  max-height: calc(94vh - 94px);
  border-radius: 8px;
  transform: scale(var(--viewer-zoom, 1));
  transform-origin: top center;
  transition: transform 140ms ease;
}

.mechanism-card {
  position: sticky;
  top: 24px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 22%, var(--border));
  border-radius: 14px;
  padding: 22px;
  background:
    radial-gradient(circle at top right, color-mix(in srgb, var(--domain-color) 9%, transparent), transparent 42%),
    var(--bg2);
}

.mechanism-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 20px; }
.mechanism-label { color: var(--accent); font: 500 18px/1.2 var(--font-serif); }
.run-simulation {
  border: 1px solid color-mix(in srgb, var(--domain-color) 45%, var(--border));
  border-radius: 999px;
  padding: 8px 11px;
  background: color-mix(in srgb, var(--domain-color) 8%, transparent);
  color: var(--domain-color);
  font: 500 9px/1 var(--font-sans);
  letter-spacing: .09em;
  text-transform: uppercase;
  cursor: pointer;
}

.flow-visual {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  align-items: center;
  margin-bottom: 22px;
}

.flow-visual::before {
  content: '';
  position: absolute;
  top: 25px;
  left: 15%;
  right: 15%;
  height: 1px;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--domain-color) 50%, transparent), transparent);
}

.flow-node { position: relative; z-index: 1; min-width: 0; text-align: center; }
.flow-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  margin: 0 auto 9px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #0d0c0b;
  color: var(--domain-color);
  font-size: 17px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, .2);
}

.flow-name {
  display: block;
  overflow: hidden;
  color: var(--fg-mid);
  font-size: 9px;
  letter-spacing: .06em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.flow-packet {
  position: absolute;
  z-index: 2;
  top: 21px;
  left: 15%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--domain-color);
  box-shadow: 0 0 15px var(--domain-color);
  opacity: 0;
}

.mechanism-card.is-running .flow-packet { animation: packet-run 2.2s cubic-bezier(.4,0,.2,1) infinite; }
.mechanism-card.is-running .flow-icon { animation: node-signal 2.2s ease-in-out infinite; }
.mechanism-card.is-running .flow-node:nth-child(2) .flow-icon { animation-delay: .65s; }
.mechanism-card.is-running .flow-node:nth-child(3) .flow-icon { animation-delay: 1.3s; }

@keyframes packet-run {
  0% { left: 15%; opacity: 0; transform: scale(.6); }
  10% { opacity: 1; }
  48% { left: 50%; opacity: 1; }
  90% { opacity: 1; }
  100% { left: 84%; opacity: 0; transform: scale(1.2); }
}

@keyframes node-signal {
  0%, 25%, 100% { border-color: var(--border); box-shadow: 0 10px 25px rgba(0,0,0,.2); }
  12% { border-color: var(--domain-color); box-shadow: 0 0 22px color-mix(in srgb, var(--domain-color) 35%, transparent); }
}

.mechanism-steps { display: grid; gap: 13px; }
.mechanism-step {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 10px;
  color: var(--fg-mid);
  font-size: 12px;
  line-height: 1.55;
}

.mechanism-step span {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 28%, var(--border));
  border-radius: 50%;
  color: var(--domain-color);
  font-size: 9px;
}

.use-case-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.use-case-card { border: 1px solid var(--border); border-radius: 12px; padding: 20px; background: var(--bg2); }
.use-case-icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 18px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 24%, var(--border));
  border-radius: 9px;
  color: var(--domain-color);
  font-size: 13px;
}

.use-case-card h3 { margin-bottom: 8px; color: var(--accent); font: 500 16px/1.3 var(--font-serif); }
.use-case-card p { color: var(--fg-mid); font-size: 11px; line-height: 1.65; }
.lesson-note {
  border-left: 2px solid var(--domain-color);
  padding: 3px 0 3px 18px;
  color: var(--fg-mid);
  font-size: 12px;
  line-height: 1.75;
}

.lesson-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 62px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.chapter-nav {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.chapter-nav:last-child { text-align: right; }
.chapter-nav:hover {
  border-color: color-mix(in srgb, var(--domain-color) 40%, var(--border));
  background: color-mix(in srgb, var(--domain-color) 5%, transparent);
}

.chapter-nav small {
  display: block;
  margin-bottom: 7px;
  color: var(--fg-dim);
  font-size: 9px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.chapter-nav strong { color: var(--accent); font: 500 15px/1.3 var(--font-serif); }

.learn-overview {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(360px, .75fr);
  gap: 24px;
  align-items: stretch;
  margin: 30px 0 26px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 22%, var(--border));
  border-radius: 18px;
  padding: 26px;
  background:
    radial-gradient(circle at 100% 0%, color-mix(in srgb, var(--domain-color) 13%, transparent), transparent 42%),
    linear-gradient(145deg, rgba(255,255,255,.018), transparent),
    var(--bg2);
}

.learn-eyebrow,
.fact-check-kicker {
  display: block;
  margin-bottom: 8px;
  color: var(--domain-color);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .17em;
  text-transform: uppercase;
}

.learn-overview-copy h2 {
  max-width: 570px;
  color: var(--accent);
  font: 500 28px/1.18 var(--font-serif);
}

.learn-overview-copy p {
  max-width: 620px;
  margin-top: 12px;
  color: var(--fg-mid);
  font-size: 12px;
  line-height: 1.7;
}

.learn-overview-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.learn-overview-stats div {
  display: flex;
  min-height: 82px;
  flex-direction: column;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  background: rgba(9, 9, 8, .4);
}

.learn-overview-stats strong {
  color: var(--accent);
  font: 500 24px/1 var(--font-serif);
}

.learn-overview-stats span {
  margin-top: 8px;
  color: var(--fg-dim);
  font-size: 8px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.learn-groups { display: grid; gap: 52px; }
.learn-group { min-width: 0; }
.learn-group-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
  margin-bottom: 16px;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--border);
}

.learn-group-head span {
  display: block;
  margin-bottom: 4px;
  color: var(--domain-color);
  font-size: 8px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.learn-group-head h2 { color: var(--accent); font: 500 23px/1.2 var(--font-serif); }
.learn-group-head p {
  flex: 0 0 auto;
  color: var(--fg-dim);
  font-size: 9px;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.lesson-card-tags {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.lesson-card-tags .lesson-category { min-width: 0; margin: 0; }
.lesson-card-summary {
  display: -webkit-box;
  min-height: 50px;
  margin-top: 9px;
  overflow: hidden;
  color: var(--fg-mid);
  font-size: 10px;
  line-height: 1.65;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.lesson-card-body { min-height: 198px; }

.verification-badge {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 10px;
  color: var(--fg-mid);
  font-size: 8px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.verification-badge.is-compact { gap: 5px; padding: 5px 7px; font-size: 7px; }
.verification-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; box-shadow: 0 0 10px currentColor; }
.verification-badge.is-verified { border-color: rgba(110, 231, 199, .25); background: rgba(110, 231, 199, .06); color: #79d8bf; }
.verification-badge.is-draft { border-color: rgba(227, 184, 109, .27); background: rgba(227, 184, 109, .07); color: #d3aa66; }
.verification-badge.is-review { border-color: rgba(142, 167, 255, .28); background: rgba(142, 167, 255, .07); color: #9ab0f4; }
.verification-badge.is-stagnant { border-color: rgba(217, 128, 128, .25); background: rgba(217, 128, 128, .06); color: #d48f8f; }
.verification-badge.is-dynamic { border-color: rgba(222, 196, 131, .26); background: rgba(222, 196, 131, .06); color: #d8c07d; }

.concept-scene {
  min-height: 410px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 15%, var(--border));
  border-radius: 18px;
  background:
    linear-gradient(155deg, rgba(255,255,255,.025), transparent 40%),
    rgba(9, 9, 8, .45);
  overflow: hidden;
  cursor: grab;
  touch-action: pan-y;
  user-select: none;
}

.concept-scene.is-dragging { cursor: grabbing; }
.structure-scene {
  position: relative;
  min-height: 410px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 15%, var(--border));
  border-radius: 18px;
  padding: 58px 30px 28px;
  background: linear-gradient(155deg, rgba(255,255,255,.025), transparent 40%), rgba(9,9,8,.45);
  overflow: hidden;
}
.structure-grid {
  position: absolute;
  inset: 0;
  opacity: .22;
  background-image:
    linear-gradient(color-mix(in srgb, var(--domain-color) 15%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--domain-color) 15%, transparent) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(to bottom, #000, transparent 88%);
}
.structure-kicker {
  position: absolute;
  z-index: 2;
  top: 18px;
  left: 24px;
  color: var(--domain-color);
  font-size: 8px;
  letter-spacing: .15em;
  text-transform: uppercase;
}
.structure-flow {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 12px;
  align-items: stretch;
}
.structure-flow article {
  display: flex;
  min-width: 0;
  min-height: 225px;
  flex-direction: column;
  border: 1px solid color-mix(in srgb, var(--domain-color) 26%, var(--border));
  border-radius: 14px;
  padding: 20px;
  background: rgba(13,12,11,.88);
}
.structure-flow article small { color: var(--domain-color); font-size: 8px; letter-spacing: .12em; }
.structure-flow article strong { margin-top: 22px; color: var(--accent); font: 500 17px/1.25 var(--font-serif); }
.structure-flow article span { margin-top: 12px; color: var(--fg-mid); font-size: 10px; line-height: 1.65; }
.structure-flow > i { align-self: center; color: var(--domain-color); font-style: normal; font-size: 17px; opacity: .7; }
.structure-scene figcaption { position: relative; z-index: 2; margin-top: 23px; color: var(--fg-dim); font-size: 9px; line-height: 1.55; text-align: center; }
.scene-model {
  position: absolute;
  inset: 0;
  z-index: 3;
  transform-style: preserve-3d;
  transition: transform 180ms ease-out;
}
.concept-scene.is-dragging .scene-model { transition: none; }
.scene-drag-hint {
  position: absolute;
  z-index: 8;
  top: 16px;
  right: 18px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 25%, var(--border));
  border-radius: 999px;
  padding: 6px 9px;
  background: rgba(10, 9, 8, .72);
  color: var(--fg-dim);
  font-size: 8px;
  letter-spacing: .09em;
  text-transform: uppercase;
}

.scene-pipeline {
  position: absolute;
  z-index: 5;
  left: 8%;
  right: 8%;
  bottom: 72px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  perspective: 800px;
}

.scene-track {
  position: absolute;
  top: 50%;
  left: 12%;
  right: 12%;
  height: 2px;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--domain-color) 70%, transparent), transparent);
  transform: translateY(-50%);
}

.scene-track span {
  position: absolute;
  top: -3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--domain-color);
  box-shadow: 0 0 16px var(--domain-color);
  animation: scene-data-run 3s ease-in-out infinite;
}

.scene-stage {
  position: relative;
  z-index: 2;
  display: flex;
  min-width: 0;
  min-height: 60px;
  flex-direction: column;
  justify-content: center;
  border: 1px solid color-mix(in srgb, var(--domain-color) 28%, var(--border));
  border-radius: 10px;
  padding: 11px;
  background: rgba(13, 12, 11, .88);
  box-shadow: 0 15px 35px rgba(0,0,0,.3), inset 0 1px rgba(255,255,255,.025);
  transform: rotateX(8deg) rotateY(-7deg);
  backdrop-filter: blur(10px);
}

.scene-stage.stage-2 {
  transform: translateY(-11px) rotateX(8deg);
  border-color: color-mix(in srgb, var(--domain-color) 55%, var(--border));
}

.scene-stage.stage-3 { transform: rotateX(8deg) rotateY(7deg); }
.scene-stage small { color: var(--domain-color); font-size: 7px; letter-spacing: .12em; }
.scene-stage strong {
  overflow: hidden;
  margin-top: 5px;
  color: var(--accent);
  font: 500 11px/1.2 var(--font-sans);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.scene-context-core {
  position: absolute;
  z-index: 4;
  top: 43%;
  left: 50%;
  display: grid;
  width: 112px;
  height: 112px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--domain-color) 55%, transparent);
  border-radius: 28px;
  background:
    linear-gradient(145deg, color-mix(in srgb, var(--domain-color) 24%, #151412), rgba(11,10,9,.96));
  color: var(--accent);
  box-shadow: 0 0 55px color-mix(in srgb, var(--domain-color) 16%, transparent), inset 0 0 28px rgba(255,255,255,.025);
  transform: translate(-50%, -50%) rotateX(-13deg) rotateY(24deg);
  transform-style: preserve-3d;
  animation: scene-core-context 6s ease-in-out infinite;
}

.scene-context-core::before,
.scene-context-core::after {
  content: '';
  position: absolute;
  inset: 9px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 17%, transparent);
  border-radius: 22px;
  transform: translateZ(-12px);
}

.scene-context-core::after { inset: 20px; border-radius: 16px; transform: translateZ(12px); }
.scene-context-core span { max-width: 90px; font: 700 18px/1 var(--font-serif); text-align: center; }
.scene-caption {
  position: absolute;
  z-index: 7;
  left: 8%;
  right: 8%;
  bottom: 18px;
  color: var(--fg-dim);
  font-size: 9px;
  line-height: 1.5;
  text-align: center;
}

.scene-layer-stack,
.scene-node-ring,
.scene-shield,
.scene-docs,
.scene-vector-cloud,
.scene-neural-web,
.scene-chip-board,
.scene-memory-stack,
.scene-browser,
.scene-racks,
.scene-qubits,
.scene-contract-cube,
.scene-industrial,
.scene-power-grid,
.machine-steam,
.machine-electric,
.scene-gears {
  position: absolute;
  z-index: 3;
  top: 43%;
  left: 50%;
  pointer-events: none;
  transform-style: preserve-3d;
}

.scene-layer-stack { width: 230px; height: 150px; transform: translate(-50%, -50%) rotateX(58deg) rotateZ(-10deg); }
.scene-layer-stack i {
  position: absolute;
  inset: 0;
  border: 1px solid color-mix(in srgb, var(--domain-color) 30%, transparent);
  border-radius: 18px;
  background: color-mix(in srgb, var(--domain-color) 6%, transparent);
}
.scene-layer-stack i:nth-child(1) { transform: translateZ(-52px) scale(.82); }
.scene-layer-stack i:nth-child(2) { transform: translateZ(0) scale(.95); }
.scene-layer-stack i:nth-child(3) { transform: translateZ(52px) scale(1.1); }

.scene-node-ring { width: 250px; height: 250px; transform: translate(-50%, -50%) rotateX(64deg); border: 1px solid color-mix(in srgb, var(--domain-color) 30%, transparent); border-radius: 50%; animation: scene-ring-spin 14s linear infinite; }
.scene-node-ring i { position: absolute; width: 16px; height: 16px; border: 1px solid var(--domain-color); border-radius: 5px; background: #11100e; box-shadow: 0 0 14px color-mix(in srgb, var(--domain-color) 45%, transparent); }
.scene-node-ring i:nth-child(1) { top: -8px; left: 50%; }
.scene-node-ring i:nth-child(2) { top: 20%; right: 2%; }
.scene-node-ring i:nth-child(3) { right: 8%; bottom: 12%; }
.scene-node-ring i:nth-child(4) { bottom: -5px; left: 42%; }
.scene-node-ring i:nth-child(5) { bottom: 17%; left: 3%; }
.scene-node-ring i:nth-child(6) { top: 19%; left: 3%; }

.scene-shield { width: 210px; height: 210px; border: 1px solid color-mix(in srgb, var(--domain-color) 35%, transparent); border-radius: 46% 46% 55% 55%; transform: translate(-50%, -50%) rotateX(12deg); clip-path: polygon(50% 0, 94% 18%, 82% 75%, 50% 100%, 18% 75%, 6% 18%); background: color-mix(in srgb, var(--domain-color) 6%, transparent); }
.scene-shield i { position: absolute; inset: 24px; border: 1px solid color-mix(in srgb, var(--domain-color) 20%, transparent); clip-path: inherit; }
.scene-beam { position: absolute; z-index: 3; top: 12%; bottom: 32%; left: 50%; width: 2px; background: linear-gradient(var(--domain-color), transparent); box-shadow: 0 0 20px var(--domain-color); transform: rotate(26deg); }

.scene-docs { width: 170px; height: 150px; transform: translate(-145%, -62%) rotateY(18deg); }
.scene-docs i { position: absolute; width: 92px; height: 118px; border: 1px solid color-mix(in srgb, var(--domain-color) 30%, transparent); border-radius: 8px; background: rgba(15,14,13,.88); }
.scene-docs i:nth-child(2) { transform: translate(24px, 12px) rotate(5deg); }
.scene-docs i:nth-child(3) { transform: translate(47px, 26px) rotate(10deg); }
.scene-vector-cloud { width: 150px; height: 120px; transform: translate(50%, -85%); }
.scene-vector-cloud i { position: absolute; width: 8px; height: 8px; border-radius: 50%; background: var(--domain-color); box-shadow: 0 0 14px var(--domain-color); animation: pulse-dot 2s ease-in-out infinite; }
.scene-vector-cloud i:nth-child(1) { top: 12%; left: 18%; }
.scene-vector-cloud i:nth-child(2) { top: 62%; left: 8%; animation-delay: -.5s; }
.scene-vector-cloud i:nth-child(3) { top: 28%; right: 9%; animation-delay: -1s; }
.scene-vector-cloud i:nth-child(4) { bottom: 6%; right: 29%; animation-delay: -1.5s; }

.scene-neural-web { width: 270px; height: 210px; transform: translate(-50%, -50%) rotateX(15deg); }
.scene-neural-web i { position: absolute; width: 13px; height: 13px; border: 1px solid var(--domain-color); border-radius: 50%; background: #111; box-shadow: 0 0 14px color-mix(in srgb, var(--domain-color) 45%, transparent); }
.scene-neural-web i:nth-child(1) { top: 16%; left: 8%; }
.scene-neural-web i:nth-child(2) { top: 66%; left: 4%; }
.scene-neural-web i:nth-child(3) { top: 5%; left: 47%; }
.scene-neural-web i:nth-child(4) { bottom: 8%; left: 48%; }
.scene-neural-web i:nth-child(5) { top: 20%; right: 5%; }
.scene-neural-web i:nth-child(6) { bottom: 17%; right: 2%; }
.scene-neural-web b { position: absolute; top: 50%; left: 6%; width: 88%; height: 1px; background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--domain-color) 45%, transparent), transparent); transform-origin: center; }
.scene-neural-web b:nth-of-type(2) { transform: rotate(28deg); }
.scene-neural-web b:nth-of-type(3) { transform: rotate(-28deg); }

.scene-chip-board { width: 280px; height: 210px; border: 1px solid color-mix(in srgb, var(--domain-color) 23%, transparent); border-radius: 22px; transform: translate(-50%, -50%) rotateX(62deg) rotateZ(-10deg); background: repeating-linear-gradient(90deg, transparent 0 27px, color-mix(in srgb, var(--domain-color) 10%, transparent) 28px); }
.scene-chip-board i { position: absolute; width: 34px; height: 34px; border: 1px solid color-mix(in srgb, var(--domain-color) 35%, transparent); background: #11100e; }
.scene-chip-board i:nth-child(1) { top: 18px; left: 18px; }
.scene-chip-board i:nth-child(2) { top: 18px; right: 18px; }
.scene-chip-board i:nth-child(3) { bottom: 18px; left: 18px; }
.scene-chip-board i:nth-child(4) { right: 18px; bottom: 18px; }
.scene-chip-board b { position: absolute; inset: 58px; border: 1px solid var(--domain-color); border-radius: 14px; box-shadow: 0 0 25px color-mix(in srgb, var(--domain-color) 25%, transparent); }

.scene-memory-stack { width: 260px; height: 180px; transform: translate(-50%, -50%) rotateX(58deg) rotateZ(9deg); }
.scene-memory-stack i { position: absolute; left: 20px; right: 20px; height: 42px; border: 1px solid color-mix(in srgb, var(--domain-color) 28%, transparent); border-radius: 9px; background: rgba(14,13,12,.86); }
.scene-memory-stack i:nth-child(1) { top: 0; }
.scene-memory-stack i:nth-child(2) { top: 42px; transform: translateZ(18px); }
.scene-memory-stack i:nth-child(3) { top: 84px; transform: translateZ(36px); }
.scene-memory-stack i:nth-child(4) { top: 126px; transform: translateZ(54px); }

.scene-browser { width: 290px; height: 190px; border: 1px solid color-mix(in srgb, var(--domain-color) 32%, transparent); border-radius: 16px; background: rgba(13,12,11,.76); transform: translate(-50%, -50%) rotateY(-11deg) rotateX(4deg); }
.scene-browser span { position: absolute; top: 0; left: 0; right: 0; height: 28px; border-bottom: 1px solid var(--border); }
.scene-browser span::before { content: '•••'; position: absolute; top: 4px; left: 12px; color: var(--domain-color); letter-spacing: 4px; }
.scene-browser i { position: absolute; border: 1px solid color-mix(in srgb, var(--domain-color) 18%, transparent); border-radius: 8px; }
.scene-browser i:nth-child(2) { top: 48px; left: 18px; width: 72px; bottom: 18px; }
.scene-browser i:nth-child(3) { top: 48px; left: 106px; right: 18px; height: 45px; }
.scene-browser i:nth-child(4) { top: 108px; left: 106px; right: 18px; bottom: 18px; }

.scene-racks { display: flex; width: 270px; height: 210px; gap: 16px; transform: translate(-50%, -50%) rotateY(-15deg) rotateX(5deg); }
.scene-racks i { flex: 1; border: 1px solid color-mix(in srgb, var(--domain-color) 28%, transparent); border-radius: 10px; background: repeating-linear-gradient(180deg, rgba(14,13,12,.9) 0 24px, color-mix(in srgb, var(--domain-color) 16%, transparent) 25px 27px); box-shadow: 13px 14px 0 rgba(0,0,0,.18); }

.scene-qubits { width: 260px; height: 260px; transform: translate(-50%, -50%) rotateX(62deg); }
.scene-qubits i { position: absolute; inset: 15px; border: 1px solid color-mix(in srgb, var(--domain-color) 35%, transparent); border-radius: 50%; animation: scene-ring-spin 10s linear infinite; }
.scene-qubits i:nth-child(2) { inset: 40px 0; transform: rotate(62deg); animation-direction: reverse; }
.scene-qubits i:nth-child(3) { inset: 0 40px; transform: rotate(-62deg); }
.scene-qubits b { position: absolute; top: 50%; left: 50%; width: 13px; height: 13px; border-radius: 50%; background: var(--domain-color); box-shadow: 0 0 24px var(--domain-color); transform: translate(-50%, -50%); }

.scene-contract-cube { width: 205px; height: 205px; transform: translate(-50%, -50%) rotateX(58deg) rotateZ(45deg); border: 1px solid color-mix(in srgb, var(--domain-color) 28%, transparent); }
.scene-contract-cube i { position: absolute; inset: 18px; border: 1px solid color-mix(in srgb, var(--domain-color) 18%, transparent); }
.scene-contract-cube i:nth-child(2) { inset: 42px; }
.scene-contract-cube i:nth-child(3) { inset: 66px; }
.scene-industrial { width: 290px; height: 205px; transform: translate(-50%, -52%) rotateX(58deg) rotateZ(-8deg); }
.scene-industrial span { position: absolute; left: 18px; right: 18px; bottom: 18px; height: 42px; border: 1px solid color-mix(in srgb, var(--domain-color) 38%, transparent); background: repeating-linear-gradient(90deg, rgba(18,16,13,.92) 0 32px, color-mix(in srgb, var(--domain-color) 20%, transparent) 33px 35px); }
.scene-industrial i { position: absolute; bottom: 60px; width: 62px; border: 1px solid color-mix(in srgb, var(--domain-color) 35%, transparent); background: rgba(14,13,11,.9); }
.scene-industrial i:nth-child(2) { left: 38px; height: 76px; }
.scene-industrial i:nth-child(3) { right: 44px; height: 118px; }
.scene-industrial b { position: absolute; top: 18px; right: 80px; width: 18px; height: 65px; border: 1px solid var(--domain-color); box-shadow: 0 -18px 28px color-mix(in srgb, var(--domain-color) 18%, transparent); }
.scene-power-grid { width: 300px; height: 210px; transform: translate(-50%, -50%) rotateX(56deg) rotateZ(7deg); }
.scene-power-grid span { position: absolute; inset: 22px; border: 1px solid color-mix(in srgb, var(--domain-color) 25%, transparent); background: linear-gradient(90deg, transparent 49%, color-mix(in srgb, var(--domain-color) 18%, transparent) 50%, transparent 51%); }
.scene-power-grid i { position: absolute; top: 16px; bottom: 16px; width: 2px; background: color-mix(in srgb, var(--domain-color) 58%, transparent); box-shadow: 0 0 15px color-mix(in srgb, var(--domain-color) 30%, transparent); }
.scene-power-grid i:nth-child(2) { left: 22%; }
.scene-power-grid i:nth-child(3) { left: 50%; }
.scene-power-grid i:nth-child(4) { right: 22%; }
.scene-power-grid b { position: absolute; left: 10%; right: 10%; top: 50%; height: 2px; background: color-mix(in srgb, var(--domain-color) 55%, transparent); }
.machine-steam { width: 300px; height: 220px; transform: translate(-50%, -52%) rotateX(10deg) rotateY(-9deg); }
.steam-boiler { position: absolute; left: 24px; bottom: 30px; width: 92px; height: 112px; border: 1px solid color-mix(in srgb, var(--domain-color) 48%, transparent); border-radius: 46px 46px 12px 12px; background: linear-gradient(90deg, #11100e, color-mix(in srgb, var(--domain-color) 18%, #11100e), #11100e); box-shadow: inset 0 0 22px rgba(255,255,255,.025); }
.steam-piston { position: absolute; top: 38px; left: 138px; width: 42px; height: 88px; border: 1px solid var(--domain-color); border-radius: 8px; background: #11100e; animation: steam-piston 1.8s ease-in-out infinite; }
.steam-rod { position: absolute; top: 72px; left: 171px; width: 74px; height: 4px; background: var(--domain-color); transform-origin: left center; animation: steam-rod 1.8s ease-in-out infinite; }
.steam-wheel { position: absolute; right: 8px; bottom: 17px; width: 105px; height: 105px; border: 5px double color-mix(in srgb, var(--domain-color) 70%, #111); border-radius: 50%; animation: machine-spin 2.8s linear infinite; }
.steam-wheel::before,
.steam-wheel::after { content: ''; position: absolute; top: 48%; left: 8%; right: 8%; height: 2px; background: color-mix(in srgb, var(--domain-color) 60%, transparent); }
.steam-wheel::after { transform: rotate(90deg); }
.machine-steam i { position: absolute; width: 24px; height: 24px; border: 1px solid color-mix(in srgb, var(--domain-color) 28%, transparent); border-radius: 50%; opacity: 0; animation: steam-puff 2.4s ease-out infinite; }
.machine-steam i:nth-of-type(1) { top: 21px; left: 50px; }
.machine-steam i:nth-of-type(2) { top: 8px; left: 68px; animation-delay: .7s; }
.machine-steam i:nth-of-type(3) { top: -7px; left: 42px; animation-delay: 1.4s; }
.machine-electric { width: 310px; height: 220px; transform: translate(-50%, -50%) rotateX(10deg) rotateY(9deg); }
.electric-stator { position: absolute; top: 28px; left: 78px; width: 145px; height: 145px; border: 12px double color-mix(in srgb, var(--domain-color) 55%, #111); border-radius: 50%; box-shadow: 0 0 35px color-mix(in srgb, var(--domain-color) 14%, transparent); }
.electric-rotor { position: absolute; top: 61px; left: 111px; width: 79px; height: 79px; border: 2px solid var(--domain-color); border-radius: 50%; background: repeating-conic-gradient(color-mix(in srgb, var(--domain-color) 35%, #111) 0 12deg, #111 12deg 24deg); animation: machine-spin 1.7s linear infinite; }
.electric-shaft { position: absolute; top: 97px; left: 184px; width: 98px; height: 7px; background: var(--domain-color); box-shadow: 0 0 12px color-mix(in srgb, var(--domain-color) 40%, transparent); }
.electric-belt { position: absolute; left: 18px; right: 12px; bottom: 6px; height: 35px; border: 1px solid color-mix(in srgb, var(--domain-color) 38%, transparent); border-radius: 18px; background: repeating-linear-gradient(90deg, rgba(15,14,12,.9) 0 24px, color-mix(in srgb, var(--domain-color) 24%, transparent) 25px 28px); animation: conveyor-shift 1.2s linear infinite; }
.machine-electric i { position: absolute; top: 88px; width: 7px; height: 7px; border-radius: 50%; background: var(--domain-color); box-shadow: 0 0 15px var(--domain-color); animation: electric-pulse 1.6s ease-in-out infinite; }
.machine-electric i:nth-of-type(1) { left: 34px; }
.machine-electric i:nth-of-type(2) { left: 54px; animation-delay: .35s; }
.machine-electric i:nth-of-type(3) { right: 12px; animation-delay: .7s; }
.scene-gears { width: 220px; height: 220px; transform: translate(-50%, -50%); }
.scene-gears i { position: absolute; border: 1px dashed color-mix(in srgb, var(--domain-color) 42%, transparent); border-radius: 50%; animation: scene-ring-spin 12s linear infinite; }
.scene-gears i:nth-child(1) { inset: 0; }
.scene-gears i:nth-child(2) { inset: 35px; animation-direction: reverse; }
.scene-gears i:nth-child(3) { inset: 68px; }

@keyframes scene-data-run {
  0% { left: 0; opacity: 0; }
  12%, 88% { opacity: 1; }
  100% { left: calc(100% - 8px); opacity: 0; }
}

@keyframes scene-core-context {
  0%, 100% { transform: translate(-50%, -50%) rotateX(-13deg) rotateY(24deg) translateY(0); }
  50% { transform: translate(-50%, -50%) rotateX(-8deg) rotateY(42deg) translateY(-8px); }
}

@keyframes scene-ring-spin { to { rotate: 360deg; } }
@keyframes machine-spin { to { transform: rotate(360deg); } }
@keyframes steam-piston { 50% { transform: translateY(28px); } }
@keyframes steam-rod { 50% { transform: rotate(18deg) translateX(8px); } }
@keyframes steam-puff { 0% { opacity: 0; transform: translateY(8px) scale(.5); } 35% { opacity: .55; } 100% { opacity: 0; transform: translateY(-42px) scale(1.7); } }
@keyframes conveyor-shift { to { background-position: 28px 0; } }
@keyframes electric-pulse { 50% { opacity: .25; transform: scale(.6); } }

.fact-check-card {
  margin-top: -24px;
  margin-bottom: 48px;
  border: 1px solid color-mix(in srgb, var(--domain-color) 20%, var(--border));
  border-radius: 14px;
  padding: 22px;
  background:
    radial-gradient(circle at 100% 0%, color-mix(in srgb, var(--domain-color) 8%, transparent), transparent 42%),
    var(--bg2);
}

.visual-analysis {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: -30px 0 40px;
}
.visual-analysis > article,
.source-library {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  background: var(--bg2);
}
.analysis-kicker {
  display: block;
  margin-bottom: 7px;
  color: var(--domain-color);
  font-size: 8px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.visual-analysis h2 { color: var(--accent); font: 500 17px/1.25 var(--font-serif); }
.visual-analysis p { margin-top: 9px; color: var(--fg-mid); font-size: 11px; line-height: 1.72; }
.source-library {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(150px, .42fr) minmax(0, 1fr);
  gap: 18px;
}
.source-library ul { display: grid; gap: 8px; list-style: none; }
.source-library a {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 7px;
  color: var(--fg-mid);
  font-size: 10px;
  line-height: 1.45;
  text-decoration: none;
}
.source-library a:hover { color: var(--domain-color); }

.fact-check-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.fact-check-head h2 { color: var(--accent); font: 500 20px/1.2 var(--font-serif); }
.fact-check-card > p { margin-top: 16px; color: var(--fg-mid); font-size: 12px; line-height: 1.75; }
.fact-check-correction {
  display: grid;
  gap: 5px;
  margin-top: 16px;
  border-left: 2px solid var(--domain-color);
  padding-left: 14px;
}
.fact-check-correction strong { color: var(--accent); font-size: 9px; letter-spacing: .1em; text-transform: uppercase; }
.fact-check-correction span { color: var(--fg-mid); font-size: 11px; line-height: 1.65; }
.fact-check-footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  color: var(--fg-dim);
  font-size: 9px;
  letter-spacing: .06em;
}
.fact-check-footer a { color: var(--domain-color); text-decoration: none; }
.fact-check-footer a:hover { text-decoration: underline; }

.learning-method { margin-top: 8px; }

@media (max-width: 900px) {
  .learn-overview { grid-template-columns: 1fr; }
  .learn-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lesson-hero { grid-template-columns: 1fr; gap: 10px; }
  .article-hero { grid-template-columns: 1fr; }
  .article-hero-image img { max-height: 420px; object-fit: contain; }
  .article-grid { grid-template-columns: 1fr; }
  .article-block { grid-column: 1 / -1; }
  .article-gallery { grid-template-columns: 1fr; }
  .topic-facts { grid-template-columns: 1fr; }
  .topic-narrative { grid-template-columns: 1fr; }
  .history-timeline-head { grid-template-columns: 1fr; }
  .history-timeline ol { grid-template-columns: 1fr; gap: 0; }
  .history-timeline li { border-top: 0; border-left: 1px solid color-mix(in srgb, var(--domain-color) 35%, var(--border)); padding: 0 0 24px 20px; }
  .history-timeline li::before { top: 3px; left: -4px; }
  .history-timeline li:last-child { padding-bottom: 0; }
  .concept-scene { min-height: 390px; }
  .structure-scene { min-height: auto; }
  .lesson-layout { grid-template-columns: 1fr; }
  .mechanism-card { position: relative; top: auto; }
}

@media (max-width: 640px) {
  .image-viewer { padding: 0; }
  .image-viewer-panel { width: 100vw; height: 100dvh; border: 0; border-radius: 0; }
  .image-viewer-panel header { align-items: flex-start; padding: 11px 12px; }
  .image-viewer-panel h2 { max-width: 145px; font-size: 14px; }
  .image-viewer-actions { gap: 4px; }
  .image-viewer-actions button { min-width: 32px; height: 32px; }
  .image-viewer-actions [data-viewer-reset] { min-width: 47px; }
  .image-viewer-actions .image-viewer-close { margin-left: 2px; }
  .image-viewer-stage { padding: 12px; }
  .image-viewer-stage img { max-height: calc(100dvh - 80px); }
  .nav { gap: 2px; margin-bottom: 42px; overflow-x: auto; }
  .nav-link { flex: 0 0 auto; margin-right: 10px; padding-right: 8px; }
  .learn-toolbar { grid-template-columns: 1fr; }
  .learn-count { text-align: left; }
  .learn-grid { grid-template-columns: 1fr; }
  .learn-overview { margin-top: 24px; padding: 20px; }
  .learn-overview-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .learn-overview-copy h2 { font-size: 24px; }
  .learn-groups { gap: 42px; }
  .lesson-thumb { height: 190px; }
  .lesson-text-preview { min-height: 180px; }
  .lesson-topbar { align-items: flex-start; }
  .lesson-tools {
    width: 100%;
    align-items: flex-start;
    flex-direction: column;
  }
  .learn-lang-toggle { width: 100%; }
  .learn-lang-toggle button { flex: 1; }
  .lesson-progress { display: none; }
  .learn-article { margin-top: 42px; }
  .article-block { padding: 20px; }
  .article-copy { font-size: 13px; line-height: 1.8; }
  .lesson-hero { min-height: auto; margin-bottom: 44px; }
  .lesson-hero.is-simple { margin: 48px 0 52px; }
  .lesson-title { font-size: 42px; }
  .concept-scene { min-height: 360px; transform: none; }
  .structure-scene { min-height: auto; padding: 52px 18px 20px; }
  .structure-flow { grid-template-columns: 1fr; }
  .structure-flow > i { transform: rotate(90deg); }
  .structure-flow article { min-height: 0; }
  .scene-pipeline { left: 5%; right: 5%; gap: 7px; bottom: 69px; }
  .scene-stage { min-height: 54px; padding: 8px; }
  .scene-stage strong { font-size: 9px; }
  .scene-caption { left: 5%; right: 5%; font-size: 8px; }
  .scene-context-core { width: 96px; height: 96px; }
  .scene-context-core span { font-size: 15px; }
  .scene-layer-stack,
  .scene-node-ring,
  .scene-neural-web,
  .scene-chip-board,
  .scene-memory-stack,
  .scene-browser,
  .scene-racks,
  .scene-qubits,
  .scene-industrial,
  .scene-power-grid { scale: .8; }
  .machine-steam,
  .machine-electric { scale: .78; }
  .fact-check-head { align-items: flex-start; flex-direction: column; }
  .fact-check-footer { flex-direction: column; }
  .visual-analysis { grid-template-columns: 1fr; }
  .source-library { grid-column: auto; grid-template-columns: 1fr; }
  .topic-facts > article,
  .topic-sources,
  .topic-narrative-copy,
  .topic-key-points,
  .history-timeline { padding: 20px; }
  .topic-sources-head { flex-direction: column; }
  .use-case-grid { grid-template-columns: 1fr; }
  .lesson-nav { grid-template-columns: 1fr; }
  .chapter-nav:last-child { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  .scene-core,
  .scene-orbit,
  .scene-chip,
  .mechanism-card.is-running .flow-packet,
  .mechanism-card.is-running .flow-icon,
  .scene-track span,
  .scene-context-core,
  .scene-node-ring,
  .scene-neural-web i,
  .scene-qubits i,
  .scene-gears i,
  .steam-piston,
  .steam-rod,
  .steam-wheel,
  .machine-steam i,
  .electric-rotor,
  .electric-belt,
  .machine-electric i { animation: none !important; }
  .lesson-card,
  .lesson-thumb img { transition: none; }
}