:root {
  --bg-ink: #08111d;
  --bg-deep: #0f1c29;
  --bg-shell: #f4efe7;
  --bg-shell-alt: #edf1ec;
  --bg-line: rgba(12, 22, 34, 0.14);
  --bg-line-strong: rgba(242, 246, 250, 0.15);
  --text-main: #13202e;
  --text-soft: #607182;
  --text-light: #f4f1eb;
  --text-light-soft: rgba(244, 241, 235, 0.72);
  --signal: #a6ff6b;
  --signal-cool: #79d3ff;
  --signal-warm: #ff9b61;
  --content-width: min(1240px, calc(100vw - 2rem));
  --font-display: "Urbanist", sans-serif;
  --font-body: "Manrope", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
  --shadow-soft: 0 24px 80px rgba(7, 13, 20, 0.25);
  --ease-out: cubic-bezier(0.18, 0.9, 0.22, 1);
  --type-hero-title: clamp(3.05rem, 6.85vw, 7.35rem);
  --type-slides-title: clamp(2.65rem, 5.9vw, 5.35rem);
  --type-lesson-title: clamp(2.35rem, 5.1vw, 4.45rem);
  --type-hero-title-mobile: clamp(1.95rem, 10vw, 4.15rem);
  --type-lesson-title-mobile: clamp(2rem, 9.5vw, 3.65rem);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 7.5rem;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text-main);
  background: var(--bg-shell);
  text-rendering: optimizeLegibility;
}

::selection {
  background: rgba(166, 255, 107, 0.24);
}

::-moz-selection {
  background: rgba(166, 255, 107, 0.24);
}

a {
  color: inherit;
  text-decoration: none;
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.section-shell {
  width: var(--content-width);
  margin: 0 auto;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem max(1rem, calc((100vw - var(--content-width)) / 2));
  background: linear-gradient(180deg, rgba(8, 17, 29, 0.82), rgba(8, 17, 29, 0.26));
  backdrop-filter: blur(16px);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.85rem;
  padding: 0.72rem 0.9rem;
  border: 1px solid rgba(244, 241, 235, 0.14);
  border-radius: 6px;
  background: rgba(8, 17, 29, 0.34);
  color: var(--text-light);
  cursor: pointer;
  transition:
    border-color 240ms var(--ease-out),
    background-color 240ms var(--ease-out),
    transform 240ms var(--ease-out);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: rgba(166, 255, 107, 0.45);
  background: rgba(8, 17, 29, 0.62);
  transform: translateY(-2px);
}

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.nav-toggle-icon {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.28rem;
  width: 1rem;
}

.nav-toggle-icon span {
  width: 100%;
  height: 1px;
  background: currentColor;
  transition:
    transform 240ms var(--ease-out),
    opacity 240ms var(--ease-out);
}

.header-mark {
  display: inline-flex;
  flex-direction: column;
  gap: 0.18rem;
  max-width: 18rem;
}

.header-mark span:first-child,
.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(244, 241, 235, 0.7);
}

.header-mark span:last-child {
  font-family: var(--font-body);
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--text-light);
}

.site-nav {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 1.2rem;
}

.site-nav a {
  position: relative;
  padding-bottom: 0.18rem;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: rgba(166, 255, 107, 0.8);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 300ms var(--ease-out);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

body.is-nav-open .nav-toggle-icon span:nth-child(1) {
  transform: translateY(0.38rem) rotate(45deg);
}

body.is-nav-open .nav-toggle-icon span:nth-child(2) {
  opacity: 0;
}

body.is-nav-open .nav-toggle-icon span:nth-child(3) {
  transform: translateY(-0.38rem) rotate(-45deg);
}

.hero {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  background:
    radial-gradient(circle at 82% 26%, rgba(121, 211, 255, 0.16), transparent 28%),
    radial-gradient(circle at 20% 82%, rgba(255, 155, 97, 0.18), transparent 34%),
    linear-gradient(140deg, #07111c 0%, #08131f 28%, #112235 66%, #08111d 100%);
  color: var(--text-light);
}

.hero-backdrop,
.hero-scrim {
  position: absolute;
  inset: 0;
}

.hero-backdrop {
  inset: -6% -3%;
}

.hero-scrim {
  background:
    linear-gradient(90deg, rgba(8, 17, 29, 0.9) 0%, rgba(8, 17, 29, 0.82) 28%, rgba(8, 17, 29, 0.38) 58%, rgba(8, 17, 29, 0.68) 100%),
    linear-gradient(180deg, rgba(8, 17, 29, 0.08) 0%, rgba(8, 17, 29, 0.54) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  min-height: 100svh;
  padding-top: 8rem;
  padding-bottom: 4.5rem;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.9fr);
  gap: clamp(1.8rem, 4vw, 4rem);
  align-items: center;
  width: 100%;
}

.hero-copy {
  min-width: 0;
  max-width: 43rem;
}

.hero-credit,
.section-kicker,
.section-kicker-dark,
.principle-index,
.lesson-number {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-credit {
  margin: 0 0 1.1rem;
  color: rgba(244, 241, 235, 0.68);
}

.hero-title {
  display: flex;
  flex-direction: column;
  gap: 0.08em;
  width: max-content;
  max-width: 100%;
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--type-hero-title);
  line-height: 0.88;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.hero-title span {
  display: block;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(1.25rem);
  animation: reveal-up 900ms var(--ease-out) forwards;
}

.hero-title span:nth-child(2) {
  animation-delay: 120ms;
}

.hero-title span:nth-child(3) {
  animation-delay: 240ms;
}

.hero-title span:nth-child(4) {
  animation-delay: 360ms;
}

.hero-title-emphasis {
  color: var(--signal);
}

.hero-summary {
  width: min(41rem, 100%);
  margin: 1.6rem 0 0;
  font-size: clamp(1.08rem, 1.7vw, 1.34rem);
  line-height: 1.65;
  color: var(--text-light-soft);
  opacity: 0;
  transform: translateY(1rem);
  animation: reveal-up 900ms 480ms var(--ease-out) forwards;
}

.hero-summary code {
  color: var(--signal-cool);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
  opacity: 0;
  transform: translateY(1rem);
  animation: reveal-up 900ms 600ms var(--ease-out) forwards;
}

.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.25rem;
  opacity: 0;
  transform: translateY(1rem);
  animation: reveal-up 900ms 720ms var(--ease-out) forwards;
}

.hero-proof span {
  padding: 0.45rem 0.7rem;
  border: 1px solid rgba(244, 241, 235, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(244, 241, 235, 0.76);
}

.hero-video-panel {
  display: grid;
  gap: 0.9rem;
  justify-self: end;
  width: min(100%, 36rem);
  opacity: 0;
  transform: translateY(1rem);
  animation: reveal-up 900ms 720ms var(--ease-out) forwards;
}

.hero-video-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.hero-video-kicker,
.hero-video-link {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-video-kicker {
  margin: 0;
  color: rgba(244, 241, 235, 0.68);
}

.hero-video-link {
  display: inline-flex;
  color: var(--signal);
  transition:
    color 240ms var(--ease-out),
    transform 240ms var(--ease-out);
}

.hero-video-link:hover,
.hero-video-link:focus-visible {
  color: var(--text-light);
  transform: translateX(2px);
}

.hero-video-shell {
  position: relative;
  padding: 0.95rem;
  border: 1px solid rgba(180, 217, 244, 0.18);
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02)),
    rgba(7, 17, 28, 0.72);
  box-shadow: 0 28px 80px rgba(7, 13, 20, 0.36);
  backdrop-filter: blur(18px);
  overflow: hidden;
}

.hero-video-shell::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(121, 211, 255, 0.14), transparent 42%, rgba(166, 255, 107, 0.12));
  pointer-events: none;
}

.hero-video-window {
  position: relative;
  z-index: 1;
  overflow: hidden;
  border: 1px solid rgba(244, 241, 235, 0.12);
  border-radius: 20px;
  aspect-ratio: 16 / 9;
  background: #050b12;
}

.hero-video-window iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #050b12;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.4rem;
  padding: 0.85rem 1.3rem;
  border: 1px solid transparent;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition:
    transform 240ms var(--ease-out),
    background-color 240ms var(--ease-out),
    border-color 240ms var(--ease-out),
    color 240ms var(--ease-out);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-3px);
}

.button-primary {
  background: var(--signal);
  color: #07111c;
}

.button-secondary {
  color: var(--text-light);
  border-color: rgba(244, 241, 235, 0.22);
  background: rgba(255, 255, 255, 0.04);
}

.button-secondary-dark {
  color: var(--text-main);
  border-color: rgba(18, 32, 46, 0.2);
  background: rgba(18, 32, 46, 0.04);
}

.hero-diagram {
  width: 100%;
  height: 100%;
  transform: scale(1.03);
  animation: float-diagram 18s ease-in-out infinite alternate;
}

.flow-path {
  fill: none;
  stroke: url(#signal-line);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 18 26;
  animation: flow 22s linear infinite;
}

.flow-path-b {
  animation-duration: 16s;
}

.flow-path-c {
  animation-duration: 20s;
}

.flow-path-d {
  animation-duration: 14s;
}

.module rect {
  fill: url(#module-fill);
  stroke: rgba(180, 217, 244, 0.22);
  stroke-width: 1.5;
}

.module text {
  fill: rgba(244, 241, 235, 0.86);
  font-family: var(--font-mono);
  font-size: 26px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.module-rule,
.module-column {
  fill: none;
  stroke: rgba(244, 241, 235, 0.22);
  stroke-width: 4;
  stroke-linecap: round;
}

.module-node,
.diagram-connectors circle,
.matrix-grid circle {
  fill: var(--signal);
}

.diagram-connectors circle {
  opacity: 0.88;
  filter: url(#soft-glow);
  animation: pulse-node 4.4s ease-in-out infinite;
}

.diagram-connectors circle:nth-child(2) {
  animation-delay: 0.4s;
}

.diagram-connectors circle:nth-child(3) {
  animation-delay: 1s;
}

.diagram-connectors circle:nth-child(4) {
  animation-delay: 1.6s;
}

.diagram-connectors circle:nth-child(5) {
  animation-delay: 2.2s;
}

.matrix-grid circle {
  fill: rgba(121, 211, 255, 0.82);
}

.statement,
.lesson-explore,
.pipeline-reality,
.code-anchors,
.visual-labs,
.closing {
  position: relative;
  padding: clamp(4.5rem, 9vw, 8rem) 0;
}

.statement {
  background:
    radial-gradient(circle at 86% 14%, rgba(121, 211, 255, 0.12), transparent 20%),
    radial-gradient(circle at 10% 84%, rgba(255, 155, 97, 0.08), transparent 20%),
    linear-gradient(180deg, #f7f1e7 0%, #ece3d7 100%);
}

.syllabus {
  padding: clamp(4.8rem, 10vw, 8.5rem) 0 clamp(2.8rem, 6vw, 4.8rem);
  background:
    radial-gradient(circle at 14% 16%, rgba(121, 211, 255, 0.12), transparent 22%),
    linear-gradient(160deg, #09131e 0%, #102030 48%, #0c1723 100%);
  color: var(--text-light);
}

.lesson-explore {
  padding-top: clamp(2.8rem, 6vw, 4.6rem);
  background:
    radial-gradient(circle at 14% 18%, rgba(166, 255, 107, 0.12), transparent 24%),
    radial-gradient(circle at 86% 82%, rgba(121, 211, 255, 0.14), transparent 22%),
    linear-gradient(180deg, #0c1723 0%, #0a1520 100%);
  color: var(--text-light);
}

.pipeline-reality {
  background:
    radial-gradient(circle at 88% 24%, rgba(121, 211, 255, 0.12), transparent 22%),
    radial-gradient(circle at 18% 82%, rgba(255, 155, 97, 0.12), transparent 24%),
    linear-gradient(180deg, #f0e7da 0%, #e2d7c7 100%);
}

.pipeline-reality::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 0%, rgba(121, 211, 255, 0.08) 36%, transparent 62%);
  background-size: 180% 100%;
  animation: sweep-pipeline 16s linear infinite;
  pointer-events: none;
}

.code-anchors {
  background:
    radial-gradient(circle at 10% 70%, rgba(166, 255, 107, 0.08), transparent 18%),
    radial-gradient(circle at 88% 18%, rgba(121, 211, 255, 0.08), transparent 20%),
    linear-gradient(180deg, #e9f0ea 0%, #f3ede3 100%);
}

.visual-labs {
  background:
    radial-gradient(circle at 82% 12%, rgba(121, 211, 255, 0.16), transparent 20%),
    radial-gradient(circle at 18% 76%, rgba(255, 155, 97, 0.12), transparent 24%),
    linear-gradient(160deg, #08111d 0%, #0b1622 48%, #101f2f 100%);
  color: var(--text-light);
}

.closing {
  background:
    radial-gradient(circle at 72% 34%, rgba(255, 155, 97, 0.14), transparent 22%),
    radial-gradient(circle at 20% 70%, rgba(121, 211, 255, 0.12), transparent 20%),
    linear-gradient(160deg, #07111c 0%, #091520 48%, #0c1723 100%);
  color: var(--text-light);
  border-top: 1px solid rgba(244, 241, 235, 0.08);
}

.closing::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(600px, 80%);
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--signal-warm), var(--signal), var(--signal-cool), transparent);
  border-radius: 2px;
}

.section-head {
  width: min(52rem, 100%);
}

.section-head-dark {
  color: var(--text-light);
}

.section-kicker {
  margin: 0 0 1rem;
  color: var(--signal-warm);
}

.section-kicker-dark {
  margin: 0 0 1rem;
  color: var(--signal-warm);
}

.section-head h2,
.closing-shell h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 4.6rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.section-head p,
.closing-shell p {
  margin: 1.2rem 0 0;
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--text-soft);
}

.section-head-dark p {
  color: rgba(244, 241, 235, 0.72);
}

.principles,
.pipeline-app,
.anchor-list,
.explore-grid,
.lab-list {
  margin-top: 3rem;
  border-top: 1px solid var(--bg-line);
}

.principle,
.anchor-row {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
  padding: 1.65rem 0;
  border-bottom: 1px solid var(--bg-line);
}

.anchor-row {
  grid-template-columns: minmax(0, 22rem) minmax(0, 1fr);
  gap: 1.8rem;
}

.anchor-row > * {
  min-width: 0;
}

.lab-list {
  border-top-color: var(--bg-line-strong);
}

.explore-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.3rem;
  border-top-color: var(--bg-line-strong);
}

.explore-card {
  position: relative;
  display: grid;
  gap: 1rem;
  padding: 1.7rem;
  border: 1px solid rgba(244, 241, 235, 0.12);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02)),
    rgba(7, 17, 28, 0.72);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition:
    transform 320ms var(--ease-out),
    border-color 320ms var(--ease-out),
    box-shadow 320ms var(--ease-out);
}

.explore-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--explore-accent) 40%, rgba(244, 241, 235, 0.14));
  box-shadow:
    0 28px 80px rgba(7, 13, 20, 0.35),
    0 0 40px color-mix(in srgb, var(--explore-accent) 8%, transparent);
}

.explore-grid > .explore-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.explore-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  border-radius: 8px 8px 0 0;
  background: linear-gradient(90deg, var(--explore-accent), var(--explore-accent-alt));
  box-shadow: 0 2px 16px color-mix(in srgb, var(--explore-accent) 22%, transparent);
}

.explore-card-architecture {
  --explore-accent: var(--signal-cool);
  --explore-accent-alt: var(--signal);
}

.explore-card-clusters {
  --explore-accent: #8ed6ff;
  --explore-accent-alt: #7fffd4;
}

.explore-card-barriers {
  --explore-accent: #ffd166;
  --explore-accent-alt: #ff9b61;
}

.explore-card-tma {
  --explore-accent: #79d3ff;
  --explore-accent-alt: #c5ff74;
}

.explore-card-copybulk {
  --explore-accent: #7fffd4;
  --explore-accent-alt: #79d3ff;
}

.explore-card-wgmma {
  --explore-accent: #c5ff74;
  --explore-accent-alt: #79d3ff;
}

.explore-card-wgmma-2 {
  --explore-accent: #ffb86c;
  --explore-accent-alt: #c5ff74;
}

.explore-card-kernel-design {
  --explore-accent: #79d3ff;
  --explore-accent-alt: #ffd166;
}

.explore-card-streamk {
  --explore-accent: #94f0ff;
  --explore-accent-alt: #ffb86c;
}

.explore-card-kernel-launch {
  --explore-accent: #c8ff7a;
  --explore-accent-alt: #94f0ff;
}

.explore-card-multigpu {
  --explore-accent: #ffd166;
  --explore-accent-alt: #8ed6ff;
}

.explore-card-orchestration {
  --explore-accent: #ff9b61;
  --explore-accent-alt: #ffd166;
}

.explore-index,
.explore-tags span,
.lesson-chip,
.lesson-meta-eyebrow,
.lesson-facts dt,
.lesson-side-nav a,
.lesson-text-link,
.lesson-resource-label {
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.explore-index {
  margin: 0;
  font-size: 0.78rem;
  color: rgba(244, 241, 235, 0.66);
}

.explore-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 2.8vw, 2.5rem);
  line-height: 0.96;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.explore-summary {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(244, 241, 235, 0.74);
}

.explore-list {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.75rem;
}

.explore-list li {
  color: rgba(244, 241, 235, 0.78);
  line-height: 1.72;
}

.explore-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.explore-tags span {
  padding: 0.45rem 0.65rem;
  border: 1px solid rgba(244, 241, 235, 0.12);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.72rem;
  color: color-mix(in srgb, var(--explore-accent) 72%, white 28%);
}

.explore-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: auto;
}

.lab-item {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  gap: 2rem;
  align-items: center;
  padding: 1.8rem 0;
  border-bottom: 1px solid var(--bg-line-strong);
}

.lab-copy {
  display: grid;
  gap: 0.9rem;
}

.lab-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
}

.lab-copy h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2.3rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.lab-copy p:last-of-type {
  margin: 0;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(244, 241, 235, 0.74);
}

.lab-preview-shell {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(244, 241, 235, 0.14);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)),
    rgba(8, 17, 29, 0.82);
}

.lab-preview-shell::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 17, 29, 0.08) 0%, rgba(8, 17, 29, 0.34) 100%);
  pointer-events: none;
}

.lab-preview-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid rgba(244, 241, 235, 0.12);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(244, 241, 235, 0.68);
}

.lab-preview {
  width: 100%;
  height: 24rem;
  border: 0;
  background: #08111d;
}

.lab-preview-image {
  width: 100%;
  height: 24rem;
  object-fit: cover;
  object-position: top center;
  display: block;
  background: #08111d;
}

.pipeline-app {
  position: relative;
  z-index: 1;
  padding-top: 1.5rem;
  --pipeline-accent: var(--signal-cool);
}

.pipeline-selector {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.85rem;
}

.pipeline-button {
  display: grid;
  gap: 0.35rem;
  padding: 1rem 1.05rem;
  border: 1px solid rgba(18, 32, 46, 0.14);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.4);
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  transition:
    transform 260ms var(--ease-out),
    border-color 260ms var(--ease-out),
    background-color 260ms var(--ease-out),
    box-shadow 260ms var(--ease-out);
}

.pipeline-button:hover,
.pipeline-button:focus-visible,
.pipeline-button.is-active {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--pipeline-accent) 55%, transparent);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 16px 34px rgba(10, 18, 29, 0.08);
}

.pipeline-button-index,
.pipeline-filepath,
.pipeline-lines,
.pipeline-code-meta {
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.pipeline-button-index {
  font-size: 0.74rem;
  color: color-mix(in srgb, var(--pipeline-accent) 72%, #102030 28%);
}

.pipeline-button-label {
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.02;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

.pipeline-button-note {
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--text-soft);
}

.pipeline-stage-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.9rem;
  margin-top: 1.4rem;
}

.pipeline-stage {
  position: relative;
  min-height: 8.4rem;
  padding: 1rem 1rem 1.15rem;
  border: 1px solid rgba(18, 32, 46, 0.12);
  border-radius: 8px;
  background: rgba(9, 19, 30, 0.92);
  color: var(--text-light);
  overflow: hidden;
}

.pipeline-stage::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  border-radius: 8px 8px 0 0;
  background: var(--pipeline-accent);
}

.pipeline-stage-index {
  display: block;
  margin-bottom: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--pipeline-accent) 68%, white 32%);
}

.pipeline-stage h4 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1;
  text-transform: uppercase;
}

.pipeline-stage p {
  margin: 0.7rem 0 0;
  font-size: 0.92rem;
  line-height: 1.65;
  color: rgba(244, 241, 235, 0.76);
}

.pipeline-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  gap: 2rem;
  align-items: start;
  margin-top: 1.4rem;
}

.pipeline-copy {
  display: grid;
  gap: 1rem;
}

.pipeline-filepath {
  margin: 0;
  font-size: 0.76rem;
  color: color-mix(in srgb, var(--pipeline-accent) 58%, #102030 42%);
  overflow-wrap: anywhere;
}

.pipeline-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3vw, 2.8rem);
  line-height: 0.96;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.pipeline-description {
  margin: 0;
  font-size: 1.04rem;
  line-height: 1.82;
  color: var(--text-soft);
}

.pipeline-points {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--bg-line);
}

.pipeline-points li {
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--bg-line);
  font-size: 0.98rem;
  line-height: 1.75;
  color: var(--text-main);
}

.pipeline-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.pipeline-lines {
  font-size: 0.74rem;
  color: color-mix(in srgb, var(--pipeline-accent) 58%, #102030 42%);
}

.pipeline-code-window {
  overflow: hidden;
  border: 1px solid rgba(10, 18, 29, 0.14);
  border-radius: 8px;
  background: #09131e;
  color: #e1ecf5;
  box-shadow: var(--shadow-soft);
}

.pipeline-code-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 1rem;
  border-bottom: 1px solid rgba(244, 241, 235, 0.1);
  font-size: 0.74rem;
  color: rgba(244, 241, 235, 0.62);
}

.pipeline-code {
  margin: 0;
  max-height: 28rem;
  overflow: auto;
  padding: 1.2rem 1.1rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.7;
  white-space: pre;
}

.principle-index {
  margin: 0.35rem 0 0;
  color: var(--signal-warm);
}

.principle h3,
.lesson-link h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.3vw, 2rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.principle p:last-child,
.anchor-row p,
.lesson-link p {
  margin: 0.75rem 0 0;
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-soft);
}

.lesson-list {
  margin: 3rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--bg-line-strong);
}

.lesson-item {
  border-bottom: 1px solid var(--bg-line-strong);
}

.lesson-link {
  display: grid;
  grid-template-columns: 88px minmax(0, 0.85fr) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
  padding: 1.5rem 0;
  transition: transform 280ms var(--ease-out), color 280ms var(--ease-out);
}

.lesson-link:hover,
.lesson-link:focus-visible {
  transform: translateX(10px);
}

.lesson-number {
  margin-top: 0.24rem;
  color: var(--lesson-accent, var(--signal));
}

.syllabus .lesson-link {
  border-left: 2px solid transparent;
  padding-left: 0.8rem;
  transition:
    transform 280ms var(--ease-out),
    color 280ms var(--ease-out),
    border-color 280ms var(--ease-out);
}

.syllabus .lesson-link:hover,
.syllabus .lesson-link:focus-visible {
  border-left-color: var(--lesson-accent, var(--signal));
}

.lesson-link p {
  color: rgba(244, 241, 235, 0.72);
}

.lesson-link code {
  color: var(--signal-cool);
}

.anchor-file {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.06rem, 2vw, 1.32rem);
  line-height: 1.55;
  color: #176791;
  font-weight: 500;
  overflow-wrap: anywhere;
  word-break: break-word;
  text-decoration: underline;
  text-decoration-color: rgba(23, 103, 145, 0.28);
  text-underline-offset: 4px;
  transition:
    color 220ms var(--ease-out),
    text-decoration-color 220ms var(--ease-out),
    transform 220ms var(--ease-out);
}

.anchor-row p {
  margin-top: 0;
  color: #415363;
  font-size: 1.02rem;
  line-height: 1.75;
}

.anchor-file:hover,
.anchor-file:focus-visible {
  color: #0f5377;
  text-decoration-color: rgba(15, 83, 119, 0.48);
  transform: translateX(4px);
}

.faq-list {
  margin-top: 3rem;
  border-top: 1px solid var(--bg-line);
}

.faq-item {
  border-bottom: 1px solid var(--bg-line);
}

.faq-heading {
  margin: 0;
}

.faq-trigger {
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  padding: 1.25rem 0;
  border: 0;
  background: transparent;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
}

.faq-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal-warm);
}

.faq-question {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.55rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.faq-icon {
  width: 0.9rem;
  height: 0.9rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform 220ms var(--ease-out);
  color: rgba(18, 32, 46, 0.55);
}

.faq-item.is-open .faq-icon {
  transform: rotate(225deg);
}

.faq-panel {
  padding: 0 0 1.35rem 4.35rem;
}

.faq-panel p {
  margin: 0;
  width: min(54rem, 100%);
  font-size: 1rem;
  line-height: 1.78;
  color: #415363;
}

.visual-labs .button-secondary {
  justify-self: start;
}

.slides-view {
  background:
    radial-gradient(circle at 84% 14%, rgba(121, 211, 255, 0.1), transparent 18%),
    linear-gradient(180deg, #09131e 0%, #102030 100%);
}

.slides-hero {
  padding: 10rem 0 3.2rem;
  color: var(--text-light);
}

.slides-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--type-slides-title);
  line-height: 0.9;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.slides-summary {
  width: min(42rem, 100%);
  margin: 1.4rem 0 0;
  font-size: 1.08rem;
  line-height: 1.8;
  color: rgba(244, 241, 235, 0.72);
}

.slides-collection {
  padding: 2rem 0 6rem;
  color: var(--text-light);
}

.slides-view .lesson-item {
  border-bottom-color: rgba(244, 241, 235, 0.08);
}

.slides-view .lesson-link {
  padding: 1.7rem 1.4rem;
  border: 1px solid rgba(244, 241, 235, 0.08);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01)),
    rgba(7, 17, 28, 0.5);
  margin-bottom: 0.6rem;
  border-left: 3px solid var(--slide-accent, var(--signal-cool));
}

.slides-view .lesson-link:hover,
.slides-view .lesson-link:focus-visible {
  transform: translateX(6px);
  border-color: color-mix(in srgb, var(--slide-accent, var(--signal-cool)) 40%, rgba(244, 241, 235, 0.12));
  border-left-color: var(--slide-accent, var(--signal-cool));
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)),
    rgba(7, 17, 28, 0.6);
}

.slides-view .lesson-item {
  border-bottom: none;
}

.slides-view .lesson-number {
  color: var(--slide-accent, var(--signal));
}

.slides-view .site-footer {
  margin-top: 0;
}

.closing-shell {
  width: min(60rem, var(--content-width));
}

.closing-shell p {
  color: rgba(244, 241, 235, 0.72);
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem 2rem;
  align-items: center;
  padding: 2rem max(1rem, calc((100vw - var(--content-width)) / 2));
  background: #07111c;
  border-top: 1px solid rgba(244, 241, 235, 0.06);
}

.site-footer p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(244, 241, 235, 0.6);
}

.footer-nav {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(244, 241, 235, 0.08);
}

.footer-nav a {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(244, 241, 235, 0.5);
  transition: color 220ms var(--ease-out);
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--signal);
}

.lesson-view {
  background:
    radial-gradient(circle at 84% 10%, rgba(121, 211, 255, 0.08), transparent 22%),
    linear-gradient(180deg, #07111c 0%, #0a1521 100%);
  color: var(--text-light);
}

.lesson-view-architecture {
  --lesson-accent: var(--signal-cool);
  --lesson-accent-alt: var(--signal);
  --lesson-accent-warm: var(--signal-warm);
}

.lesson-view-clusters {
  --lesson-accent: #8ed6ff;
  --lesson-accent-alt: #7fffd4;
  --lesson-accent-warm: #ffc07d;
}

.lesson-view-barriers {
  --lesson-accent: #ffd166;
  --lesson-accent-alt: #ff9b61;
  --lesson-accent-warm: #ffe6a8;
}

.lesson-view-tma {
  --lesson-accent: #79d3ff;
  --lesson-accent-alt: #c5ff74;
  --lesson-accent-warm: #b0f4ff;
}

.lesson-view-copybulk {
  --lesson-accent: #7fffd4;
  --lesson-accent-alt: #79d3ff;
  --lesson-accent-warm: #bafcee;
}

.lesson-view-wgmma {
  --lesson-accent: #c5ff74;
  --lesson-accent-alt: #79d3ff;
  --lesson-accent-warm: #ebffc0;
}

.lesson-view-wgmma-2 {
  --lesson-accent: #ffb86c;
  --lesson-accent-alt: #c5ff74;
  --lesson-accent-warm: #ffe6a8;
}

.lesson-view-kernel-design {
  --lesson-accent: #79d3ff;
  --lesson-accent-alt: #ffd166;
  --lesson-accent-warm: #b0f4ff;
}

.lesson-view-streamk {
  --lesson-accent: #94f0ff;
  --lesson-accent-alt: #ffb86c;
  --lesson-accent-warm: #dff7ff;
}

.lesson-view-kernel-launch {
  --lesson-accent: #c8ff7a;
  --lesson-accent-alt: #94f0ff;
  --lesson-accent-warm: #f0ffd1;
}

.lesson-view-multigpu {
  --lesson-accent: #ffd166;
  --lesson-accent-alt: #8ed6ff;
  --lesson-accent-warm: #ffe6a8;
}

.lesson-view-orchestration {
  --lesson-accent: #ff9b61;
  --lesson-accent-alt: #ffd166;
  --lesson-accent-warm: #ffd5b0;
}

.lesson-view .site-header {
  background: linear-gradient(180deg, rgba(7, 17, 28, 0.9), rgba(7, 17, 28, 0.3));
}

.lesson-hero {
  position: relative;
  overflow: hidden;
  padding: 10rem 0 4rem;
}

.lesson-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 18%, color-mix(in srgb, var(--lesson-accent) 18%, transparent), transparent 24%),
    radial-gradient(circle at 86% 20%, color-mix(in srgb, var(--lesson-accent-alt) 14%, transparent), transparent 26%),
    linear-gradient(140deg, rgba(7, 17, 28, 0.96) 0%, rgba(10, 21, 33, 0.78) 42%, rgba(7, 17, 28, 0.96) 100%);
}

.lesson-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: rgba(244, 241, 235, 0.08);
}

.lesson-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(320px, 0.72fr);
  gap: 2rem;
  align-items: center;
}

.lesson-hero-copy {
  display: grid;
  gap: 1rem;
  min-width: 0;
}

.lesson-hero-title {
  margin: 0;
  font-family: var(--font-display);
  max-width: min(100%, 16ch);
  font-size: var(--type-lesson-title);
  line-height: 0.92;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  text-wrap: balance;
  overflow-wrap: anywhere;
}

.lesson-hero-summary {
  max-width: 44rem;
  margin: 0;
  font-size: 1.08rem;
  line-height: 1.86;
  color: rgba(244, 241, 235, 0.74);
}

.lesson-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.lesson-chip {
  padding: 0.5rem 0.7rem;
  border: 1px solid rgba(244, 241, 235, 0.12);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  font-size: 0.72rem;
  color: color-mix(in srgb, var(--lesson-accent) 68%, white 32%);
}

.lesson-meta-card,
.lesson-sidebar-card,
.lesson-chapter,
.lesson-resource-card {
  border: 1px solid rgba(244, 241, 235, 0.1);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02)),
    rgba(10, 21, 33, 0.78);
}

.lesson-meta-card {
  position: relative;
  display: grid;
  gap: 1rem;
  padding: 1.45rem;
  box-shadow: var(--shadow-soft);
  min-width: 0;
}

.lesson-meta-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  border-radius: 8px 8px 0 0;
  background: linear-gradient(90deg, var(--lesson-accent), var(--lesson-accent-alt));
  box-shadow: 0 2px 16px color-mix(in srgb, var(--lesson-accent) 22%, transparent);
}

.lesson-meta-eyebrow {
  margin: 0;
  font-size: 0.74rem;
  color: color-mix(in srgb, var(--lesson-accent) 74%, white 26%);
}

.lesson-meta-card h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.45rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.lesson-meta-card p {
  margin: 0;
  line-height: 1.75;
  color: rgba(244, 241, 235, 0.74);
}

.lesson-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 0;
}

.lesson-facts div {
  padding-top: 0.85rem;
  border-top: 1px solid rgba(244, 241, 235, 0.1);
}

.lesson-facts dt {
  font-size: 0.7rem;
  color: rgba(244, 241, 235, 0.5);
}

.lesson-facts dd {
  margin: 0.45rem 0 0;
  color: var(--text-light);
  line-height: 1.6;
  overflow-wrap: anywhere;
  word-break: break-word;
  min-width: 0;
}

.lesson-body {
  padding: 2rem 0 6rem;
}

.lesson-video-band {
  padding: 0 0 1.5rem;
}

.lesson-video-band + .lesson-body {
  padding-top: 0.75rem;
}

.lesson-video-card {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  gap: 1.5rem;
  align-items: center;
  padding: 1.45rem;
  border: 1px solid rgba(244, 241, 235, 0.1);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02)),
    rgba(10, 21, 33, 0.78);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.lesson-video-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    linear-gradient(
      135deg,
      color-mix(in srgb, var(--lesson-accent) 18%, transparent),
      transparent 44%,
      color-mix(in srgb, var(--lesson-accent-alt) 14%, transparent)
    );
  pointer-events: none;
}

.lesson-video-copy,
.lesson-video-frame {
  position: relative;
  z-index: 1;
}

.lesson-video-copy {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.lesson-video-copy h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.lesson-video-copy p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.78;
  color: rgba(244, 241, 235, 0.74);
}

.lesson-video-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.lesson-video-meta span {
  padding: 0.45rem 0.7rem;
  border: 1px solid color-mix(in srgb, var(--lesson-accent) 28%, rgba(244, 241, 235, 0.14));
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--lesson-accent) 72%, white 28%);
}

.lesson-video-link {
  width: fit-content;
}

.lesson-video-frame {
  width: min(100%, 46rem);
  justify-self: end;
}

.lesson-layout {
  display: grid;
  grid-template-columns: 324px minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.lesson-sidebar {
  position: sticky;
  top: 6.8rem;
  display: grid;
  gap: 1.05rem;
}

.lesson-sidebar-card {
  padding: 1.3rem 1.35rem;
  box-shadow: 0 18px 44px rgba(2, 7, 11, 0.16);
}

.lesson-sidebar-card .section-kicker {
  margin-bottom: 0.95rem;
}

.lesson-sidebar-card p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.72;
  color: rgba(244, 241, 235, 0.72);
}

.lesson-side-nav {
  display: grid;
  gap: 0;
}

.lesson-side-nav a {
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.45;
  text-transform: none;
  padding: 0.78rem 0;
  border-bottom: 1px solid rgba(244, 241, 235, 0.08);
  color: rgba(244, 241, 235, 0.78);
  overflow-wrap: anywhere;
  transition:
    color 220ms var(--ease-out),
    transform 220ms var(--ease-out);
}

.lesson-side-nav a:hover,
.lesson-side-nav a:focus-visible,
.lesson-text-link:hover,
.lesson-text-link:focus-visible {
  color: var(--lesson-accent);
  transform: translateX(4px);
}

.lesson-side-nav a.is-active {
  color: var(--lesson-accent);
  border-bottom-color: color-mix(in srgb, var(--lesson-accent) 22%, transparent);
  padding-left: 0.65rem;
  border-left: 2px solid var(--lesson-accent);
}

.lesson-mini-list {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.8rem;
}

.lesson-mini-list li {
  font-size: 1rem;
  line-height: 1.62;
  color: rgba(244, 241, 235, 0.74);
}

.lesson-text-link {
  display: block;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.45;
  text-transform: none;
  padding: 0.82rem 0;
  border-top: 1px solid rgba(244, 241, 235, 0.08);
  color: rgba(244, 241, 235, 0.76);
  overflow-wrap: anywhere;
  transition:
    color 220ms var(--ease-out),
    transform 220ms var(--ease-out);
}

.lesson-article {
  display: grid;
  gap: 1.4rem;
}

.lesson-chapter {
  padding: 1.6rem 1.7rem 1.8rem;
  box-shadow: 0 20px 48px rgba(2, 7, 11, 0.18);
}

.lesson-chapter > :first-child {
  margin-top: 0;
}

.lesson-chapter h2 {
  margin: 0 0 0.95rem;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3vw, 2.8rem);
  line-height: 0.98;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  color: var(--text-light);
}

.lesson-chapter h3 {
  margin: 1.4rem 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.18rem;
  line-height: 1.04;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--text-light);
}

.lesson-chapter p,
.lesson-chapter li {
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(244, 241, 235, 0.78);
}

.lesson-chapter ul,
.lesson-chapter ol {
  margin: 0.9rem 0 0;
  padding-left: 1.15rem;
  display: grid;
  gap: 0.65rem;
}

.lesson-chapter code,
.lesson-table td code {
  color: var(--lesson-accent);
}

.lesson-note {
  margin-top: 1rem;
  padding: 1rem 1rem 1.05rem;
  border-left: 3px solid var(--lesson-accent);
  border-radius: 0 6px 6px 0;
  background: rgba(121, 211, 255, 0.08);
}

.lesson-note p {
  margin: 0;
}

.lesson-card-grid,
.lesson-resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.2rem;
}

.lesson-card {
  padding: 1rem 1rem 1.1rem;
  border: 1px solid rgba(244, 241, 235, 0.09);
  border-radius: 6px;
  background: rgba(6, 14, 22, 0.58);
}

.lesson-card h3 {
  margin-top: 0;
}

.lesson-card p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.7;
  color: rgba(244, 241, 235, 0.74);
}

.lesson-pre {
  margin-top: 1rem;
  padding: 1rem;
  overflow: auto;
  border: 1px solid rgba(244, 241, 235, 0.09);
  border-radius: 6px;
  background: #06111b;
  color: #dbe8f4;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.7;
  white-space: pre-wrap;
}

.lesson-table {
  width: 100%;
  margin-top: 1.1rem;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid rgba(244, 241, 235, 0.09);
  border-radius: 6px;
  background: rgba(6, 14, 22, 0.54);
}

.lesson-table th,
.lesson-table td {
  padding: 0.9rem 0.95rem;
  border-bottom: 1px solid rgba(244, 241, 235, 0.08);
  text-align: left;
  vertical-align: top;
}

.lesson-table th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(244, 241, 235, 0.74);
  background: rgba(255, 255, 255, 0.04);
}

.lesson-table tr:last-child td {
  border-bottom: none;
}

.lesson-resource-card {
  display: grid;
  gap: 0.7rem;
  padding: 1.2rem;
  transition:
    transform 240ms var(--ease-out),
    border-color 240ms var(--ease-out);
}

.lesson-resource-card:hover,
.lesson-resource-card:focus-visible {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--lesson-accent) 44%, rgba(244, 241, 235, 0.14));
}

.lesson-resource-label {
  font-size: 0.7rem;
  color: color-mix(in srgb, var(--lesson-accent) 72%, white 28%);
}

.lesson-resource-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.3rem;
  line-height: 1;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.lesson-resource-card p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.7;
  color: rgba(244, 241, 235, 0.74);
}

.lesson-view .site-footer {
  margin-top: 0;
  border-top: 1px solid rgba(244, 241, 235, 0.08);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 520ms var(--ease-out),
    transform 520ms var(--ease-out);
  transition-delay: calc(var(--reveal-order, 0) * 35ms);
}

.statement[data-reveal],
.syllabus[data-reveal],
.lesson-explore[data-reveal],
.pipeline-reality[data-reveal],
.code-anchors[data-reveal],
.visual-labs[data-reveal],
.closing[data-reveal],
.slides-collection[data-reveal] {
  opacity: 1;
  transform: none;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes flow {
  from {
    stroke-dashoffset: 0;
  }
  to {
    stroke-dashoffset: -420;
  }
}

@keyframes pulse-node {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.78;
  }
  50% {
    transform: scale(1.34);
    opacity: 1;
  }
}

@keyframes float-diagram {
  from {
    transform: scale(1.03) translate3d(0, 0, 0);
  }
  to {
    transform: scale(1.06) translate3d(1.4%, -0.8%, 0);
  }
}

@keyframes reveal-up {
  from {
    opacity: 0;
    transform: translateY(1.2rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes sweep-pipeline {
  from {
    background-position: 0% 50%;
  }
  to {
    background-position: 180% 50%;
  }
}

/* Dark-theme scrollbars */
.pipeline-code,
.lesson-pre {
  scrollbar-width: thin;
  scrollbar-color: rgba(244, 241, 235, 0.18) transparent;
}

.pipeline-code::-webkit-scrollbar,
.lesson-pre::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.pipeline-code::-webkit-scrollbar-track,
.lesson-pre::-webkit-scrollbar-track {
  background: transparent;
}

.pipeline-code::-webkit-scrollbar-thumb,
.lesson-pre::-webkit-scrollbar-thumb {
  background: rgba(244, 241, 235, 0.18);
  border-radius: 3px;
}

.pipeline-code::-webkit-scrollbar-thumb:hover,
.lesson-pre::-webkit-scrollbar-thumb:hover {
  background: rgba(244, 241, 235, 0.32);
}

@media (max-width: 960px) {
  .site-header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.9rem 1rem;
  }

  .nav-toggle {
    display: inline-flex;
    justify-self: end;
  }

  .site-nav {
    grid-column: 1 / -1;
    display: grid;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-0.55rem);
    transition:
      max-height 300ms var(--ease-out),
      opacity 220ms var(--ease-out),
      transform 300ms var(--ease-out),
      padding 300ms var(--ease-out),
      border-color 240ms var(--ease-out);
    padding: 0 1rem;
    border: 1px solid transparent;
    background:
      linear-gradient(180deg, rgba(10, 19, 31, 0.96), rgba(10, 19, 31, 0.9)),
      rgba(10, 19, 31, 0.96);
  }

  body.is-nav-open .site-nav {
    max-height: 24rem;
    padding: 0.4rem 1rem 0.3rem;
    border-color: rgba(244, 241, 235, 0.1);
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav a {
    padding: 0.9rem 0;
  }

  .site-nav a + a {
    border-top: 1px solid rgba(244, 241, 235, 0.08);
  }

  .hero-content {
    padding-top: 9.5rem;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: start;
  }

  .hero-copy {
    max-width: 100%;
  }

  .hero-video-panel {
    justify-self: start;
    width: min(100%, 42rem);
  }

  .lesson-video-card {
    grid-template-columns: 1fr;
  }

  .lesson-video-frame {
    width: 100%;
    justify-self: stretch;
  }

  .lesson-link {
    grid-template-columns: 72px 1fr;
  }

  .lesson-link p {
    grid-column: 2;
  }

  .pipeline-selector {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .pipeline-panel,
  .lab-item,
  .explore-grid,
  .lesson-hero-grid,
  .lesson-layout {
    grid-template-columns: 1fr;
  }

  .lesson-sidebar {
    position: static;
  }
}

@media (max-width: 760px) {
  html {
    scroll-padding-top: 6.5rem;
  }

  .site-header {
    padding-top: 0.85rem;
    padding-bottom: 0.85rem;
  }

  .header-mark {
    max-width: 12.5rem;
  }

  .header-mark span:first-child,
  .site-nav a,
  .nav-toggle-label {
    font-size: 0.7rem;
  }

  .header-mark span:last-child {
    font-size: 0.86rem;
  }

  .hero-content {
    padding-top: 8.75rem;
    padding-bottom: 3.5rem;
  }

  .hero-layout {
    gap: 1.5rem;
  }

  .lesson-hero {
    padding-top: 8.75rem;
    padding-bottom: 3rem;
  }

  .hero-title {
    width: auto;
    font-size: var(--type-hero-title-mobile);
  }

  .lesson-hero-title {
    font-size: var(--type-lesson-title-mobile);
  }

  .hero-summary {
    font-size: 1rem;
  }

  .hero-proof {
    gap: 0.55rem;
  }

  .hero-proof span {
    width: 100%;
  }

  .hero-video-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.55rem;
  }

  .hero-video-shell {
    padding: 0.72rem;
    border-radius: 22px;
  }

  .hero-video-window {
    border-radius: 16px;
  }

  .lesson-video-band {
    padding-bottom: 1rem;
  }

  .lesson-video-card {
    padding: 1rem;
  }

  .lesson-facts {
    grid-template-columns: 1fr;
  }

  .principle,
  .pipeline-panel,
  .anchor-row,
  .lab-item,
  .explore-grid,
  .lesson-link,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .pipeline-selector {
    grid-template-columns: 1fr;
  }

  .pipeline-stage-strip {
    grid-template-columns: 1fr;
  }

  .lesson-chapter,
  .explore-card,
  .lesson-meta-card,
  .lesson-sidebar-card,
  .lesson-resource-card {
    padding-left: 1.2rem;
    padding-right: 1.2rem;
  }

  .anchor-row {
    gap: 0.8rem;
  }

  .faq-trigger {
    grid-template-columns: 1fr auto;
    gap: 0.8rem;
  }

  .faq-index {
    grid-column: 1 / -1;
  }

  .faq-panel {
    padding-left: 0;
  }

  .lesson-link p,
  .lesson-link h3 {
    grid-column: auto;
  }

  .site-footer {
    grid-template-columns: 1fr;
  }

  .footer-nav {
    gap: 0.8rem 1.2rem;
  }

  .principle-index,
  .lesson-number {
    margin-top: 0;
  }

  .button {
    width: 100%;
  }

  .pipeline-actions {
    align-items: stretch;
  }

  .lab-preview {
    height: 18rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}