:root {
  color-scheme: light;
  --paper: #f4f1e8;
  --paper-deep: #ebe5d8;
  --surface: #fbfaf5;
  --surface-strong: #ffffff;
  --ink: #132422;
  --ink-soft: #2c403d;
  --muted: #667572;
  --line: #d6d4ca;
  --line-dark: rgba(19, 36, 34, 0.16);
  --teal: #1ca794;
  --teal-dark: #0f7166;
  --coral: #ee6e55;
  --amber: #e8a931;
  --violet: #7658df;
  --blue: #3d78e6;
  --lime: #b7d95a;
  --shadow: 0 24px 70px rgba(28, 41, 37, 0.11);
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 28px;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  transform: translateY(-160%);
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  padding: 10px 14px;
}

.skip-link:focus {
  transform: translateY(0);
}

.topbar {
  position: absolute;
  z-index: 10;
  top: 0;
  left: 0;
  display: flex;
  width: 100%;
  min-height: 74px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 clamp(20px, 4vw, 64px);
  border-bottom: 1px solid rgba(19, 36, 34, 0.12);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: inherit;
  font-weight: 760;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  min-width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 9px;
  background: var(--ink);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.brand-name {
  font-size: 0.92rem;
}

.top-links {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 32px);
  font-size: 0.84rem;
  font-weight: 740;
}

.top-links a {
  text-decoration: none;
}

.top-links a:not(.nav-pill) {
  color: var(--ink-soft);
}

.top-links a:hover,
.top-links a:focus-visible {
  color: var(--teal-dark);
}

.nav-pill {
  border: 1px solid var(--ink);
  border-radius: 999px;
  padding: 8px 13px;
  transition: background 160ms ease, color 160ms ease;
}

.nav-pill:hover,
.nav-pill:focus-visible {
  background: var(--ink);
  color: #fff !important;
  outline: none;
}

.hero {
  position: relative;
  display: grid;
  min-height: min(940px, 100vh);
  grid-template-columns: minmax(0, 1.05fr) minmax(430px, 0.95fr);
  align-items: center;
  gap: clamp(38px, 6vw, 110px);
  overflow: hidden;
  padding: 126px clamp(24px, 6vw, 96px) 82px;
  border-bottom: 1px solid var(--line-dark);
  isolation: isolate;
}

.hero-grid {
  position: absolute;
  z-index: -3;
  inset: 0;
  background-image:
    linear-gradient(rgba(19, 36, 34, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(19, 36, 34, 0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, #000, rgba(0, 0, 0, 0.3) 82%, transparent);
}

.hero::before {
  position: absolute;
  z-index: -2;
  width: 70vw;
  height: 70vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(181, 224, 211, 0.64) 0, rgba(181, 224, 211, 0.18) 42%, transparent 68%);
  content: "";
  right: -28vw;
  top: -26vw;
}

.hero::after {
  position: absolute;
  z-index: -2;
  width: 44vw;
  height: 44vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(242, 185, 79, 0.19), transparent 68%);
  content: "";
  left: -18vw;
  bottom: -25vw;
}

.hero-copy {
  position: relative;
  z-index: 2;
  max-width: 810px;
}

.eyebrow,
.section-no,
.stage-kicker,
.micro-label,
.concept-kicker {
  margin: 0;
  color: var(--teal-dark);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.105em;
  text-transform: uppercase;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 24px;
}

.live-dot,
.status-light {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 6px rgba(28, 167, 148, 0.12);
}

.hero h1 {
  max-width: 880px;
  margin: 0;
  font-size: clamp(3.3rem, 7.4vw, 7.9rem);
  font-weight: 780;
  letter-spacing: -0.072em;
  line-height: 0.92;
}

.hero h1 em,
.takeaway h2 em {
  color: var(--teal-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  letter-spacing: -0.05em;
}

.hero-lede {
  max-width: 680px;
  margin: 32px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.04rem, 1.4vw, 1.28rem);
  line-height: 1.65;
}

.hero-actions,
.takeaway-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border-radius: 999px;
  padding: 11px 19px;
  font-size: 0.88rem;
  font-weight: 780;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
  outline: none;
}

.button-primary {
  background: var(--ink);
  box-shadow: 0 12px 26px rgba(19, 36, 34, 0.18);
  color: #fff;
}

.button-primary:hover,
.button-primary:focus-visible {
  box-shadow: 0 16px 36px rgba(19, 36, 34, 0.25);
}

.button-quiet {
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.45);
}

.button-quiet:hover,
.button-quiet:focus-visible {
  border-color: var(--teal-dark);
  background: #fff;
}

.hero-concept {
  position: relative;
  z-index: 2;
  width: min(100%, 600px);
  justify-self: end;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  background: var(--ink);
  box-shadow: 0 38px 90px rgba(19, 36, 34, 0.24);
  color: #fff;
  padding: clamp(24px, 4vw, 46px);
}

.hero-concept::after {
  position: absolute;
  z-index: -1;
  inset: 12px -12px -12px 12px;
  border: 1px solid rgba(19, 36, 34, 0.2);
  border-radius: var(--radius-lg);
  content: "";
}

.concept-block {
  display: grid;
  gap: 6px;
  min-height: 130px;
  align-content: center;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 24px;
}

.concept-block strong {
  font-size: clamp(1.45rem, 3vw, 2.15rem);
  letter-spacing: -0.045em;
}

.concept-block > span:last-child {
  color: #aab9b5;
  font-family: var(--mono);
  font-size: 0.72rem;
}

.concept-kicker {
  color: #8dd9ce;
}

.graph-block {
  background:
    radial-gradient(circle at 82% 20%, rgba(61, 120, 230, 0.25), transparent 40%),
    #1a302e;
}

.splat-block {
  background:
    radial-gradient(ellipse at 80% 30%, rgba(238, 110, 85, 0.24), transparent 28%),
    radial-gradient(ellipse at 58% 72%, rgba(118, 88, 223, 0.25), transparent 28%),
    radial-gradient(ellipse at 20% 38%, rgba(28, 167, 148, 0.22), transparent 28%),
    #1a302e;
}

.concept-bridge {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 10px;
  min-height: 78px;
}

.bridge-line {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.42));
}

.bridge-line:last-child {
  transform: scaleX(-1);
}

.bridge-card {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  padding: 8px 13px;
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 800;
}

.bridge-card i {
  width: 8px;
  height: 8px;
  transform: rotate(45deg);
  background: var(--coral);
}

.concept-equation {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 24px 0 0;
  color: #81928e;
  font-family: var(--mono);
  font-size: 0.67rem;
}

.concept-equation span {
  color: #dce8e5;
}

.hero-splats {
  position: absolute;
  z-index: 0;
  inset: 0;
  pointer-events: none;
}

.hero-splats .splat {
  position: absolute;
  z-index: 0;
  display: block;
  border-radius: 50%;
  filter: blur(0.3px);
  opacity: 0.72;
  animation: float-splat 7s ease-in-out infinite;
}

.splat-a {
  top: 18%;
  right: 45%;
  width: 44px;
  height: 14px;
  transform: rotate(-28deg);
  background: rgba(238, 110, 85, 0.55);
}

.splat-b {
  top: 23%;
  right: 41%;
  width: 24px;
  height: 58px;
  transform: rotate(36deg);
  background: rgba(118, 88, 223, 0.45);
  animation-delay: -2s !important;
}

.splat-c {
  bottom: 14%;
  left: 49%;
  width: 58px;
  height: 20px;
  transform: rotate(14deg);
  background: rgba(28, 167, 148, 0.45);
  animation-delay: -4s !important;
}

.splat-d {
  bottom: 20%;
  right: 3%;
  width: 28px;
  height: 72px;
  transform: rotate(-38deg);
  background: rgba(232, 169, 49, 0.38);
  animation-delay: -5s !important;
}

@keyframes float-splat {
  0%, 100% { translate: 0 0; }
  50% { translate: 0 -13px; }
}

.section-pad {
  width: min(1500px, calc(100% - clamp(32px, 8vw, 128px)));
  margin-inline: auto;
  padding-block: clamp(84px, 10vw, 150px);
}

.thesis {
  border-bottom: 1px solid var(--line-dark);
}

.thesis-grid {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(340px, 0.78fr);
  justify-content: space-between;
  gap: clamp(40px, 8vw, 130px);
  margin-top: 28px;
}

.thesis h2,
.section-heading h2,
.mixer-copy h2,
.takeaway h2 {
  margin: 0;
  font-size: clamp(2.25rem, 4.7vw, 5.3rem);
  font-weight: 720;
  letter-spacing: -0.058em;
  line-height: 1.02;
}

.thesis-copy {
  align-self: end;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.25vw, 1.17rem);
}

.thesis-copy p {
  margin: 0;
}

.thesis-copy p + p {
  margin-top: 18px;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.42fr);
  align-items: end;
  gap: 40px;
  margin-bottom: clamp(34px, 5vw, 62px);
}

.section-heading h2 {
  max-width: 980px;
  margin-top: 14px;
}

.heading-note {
  max-width: 440px;
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.walkthrough {
  width: min(1640px, calc(100% - clamp(24px, 5vw, 80px)));
}

.lab-shell {
  overflow: hidden;
  border: 1px solid rgba(19, 36, 34, 0.22);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.lab-topbar {
  display: grid;
  min-height: 48px;
  grid-template-columns: auto minmax(120px, 1fr) auto;
  align-items: center;
  gap: 22px;
  padding: 0 20px;
  border-bottom: 1px solid var(--line-dark);
  background: #eae7dd;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.lab-status {
  display: flex;
  align-items: center;
  gap: 9px;
}

.status-light {
  width: 7px;
  height: 7px;
  box-shadow: none;
  animation: status-pulse 2s ease-in-out infinite;
}

@keyframes status-pulse {
  50% { opacity: 0.4; }
}

.lab-progress {
  height: 4px;
  overflow: hidden;
  border-radius: 99px;
  background: rgba(19, 36, 34, 0.1);
}

.lab-progress span {
  display: block;
  width: 14.285%;
  height: 100%;
  border-radius: inherit;
  background: var(--teal);
  transition: width 380ms cubic-bezier(0.22, 1, 0.36, 1);
}

.lab-layout {
  display: grid;
  grid-template-columns: 235px minmax(0, 1fr);
}

.step-rail {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line-dark);
  background: #efede5;
}

.step-button {
  position: relative;
  display: grid;
  min-height: 88px;
  grid-template-columns: 34px 1fr;
  align-items: center;
  gap: 10px;
  border: 0;
  border-bottom: 1px solid rgba(19, 36, 34, 0.09);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  padding: 14px 16px;
  text-align: left;
  transition: background 160ms ease, color 160ms ease;
}

.step-button::before {
  position: absolute;
  width: 3px;
  height: 0;
  left: 0;
  top: 50%;
  background: var(--teal);
  content: "";
  transform: translateY(-50%);
  transition: height 180ms ease;
}

.step-button:hover,
.step-button:focus-visible {
  background: rgba(255, 255, 255, 0.6);
  color: var(--ink);
  outline: none;
}

.step-button.is-active {
  background: var(--surface);
  color: var(--ink);
}

.step-button.is-active::before {
  height: 100%;
}

.step-button.is-complete .step-index {
  background: var(--teal);
  color: #fff;
}

.step-index {
  display: grid;
  width: 27px;
  height: 27px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.62rem;
}

.step-button strong,
.step-button small {
  display: block;
}

.step-button strong {
  font-size: 0.85rem;
}

.step-button small {
  margin-top: 2px;
  font-size: 0.67rem;
  font-weight: 500;
}

.lab-main {
  min-width: 0;
  padding: clamp(22px, 3.2vw, 48px);
}

.stage-copy {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(270px, 0.7fr);
  align-items: end;
  gap: 34px;
  min-height: 105px;
  margin-bottom: 28px;
}

.stage-kicker {
  margin-bottom: 9px;
}

.stage-copy h3 {
  margin: 0;
  font-size: clamp(1.65rem, 2.8vw, 3.25rem);
  letter-spacing: -0.048em;
  line-height: 1.02;
}

.stage-copy > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.visual-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.visual-panel,
.pixel-strip figure,
.evidence-card {
  margin: 0;
}

.visual-panel {
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: 14px;
  background: #f1efe7;
}

.visual-panel > figcaption {
  display: flex;
  min-height: 38px;
  align-items: center;
  gap: 9px;
  padding: 0 12px;
  border-bottom: 1px solid var(--line-dark);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.63rem;
  font-weight: 750;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.visual-panel figcaption span {
  display: grid;
  width: 20px;
  height: 20px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 0.56rem;
}

.visual-panel figcaption b {
  margin-left: auto;
  color: var(--teal-dark);
  font-weight: 800;
}

.visual-panel canvas,
.visual-panel svg {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 720 / 390;
}

.graph-panel {
  background: #172a28;
}

.graph-panel > figcaption {
  border-color: rgba(255, 255, 255, 0.1);
  background: #1b302e;
  color: #93a5a1;
}

.graph-panel figcaption b {
  color: #8dd9ce;
}

.pixel-strip {
  display: grid;
  grid-template-columns: minmax(120px, 0.7fr) minmax(100px, 1fr) 20px minmax(100px, 1fr) 20px minmax(100px, 1fr);
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  border: 1px solid var(--line-dark);
  border-radius: 14px;
  background: #eae7dd;
  padding: 12px;
}

.pixel-intro {
  display: grid;
  gap: 3px;
  padding: 4px 8px;
}

.pixel-intro strong {
  font-size: 0.9rem;
}

.pixel-intro small {
  max-width: 180px;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.4;
}

.pixel-strip figure {
  min-width: 0;
}

.pixel-strip figcaption {
  margin: 0 0 5px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.58rem;
}

.pixel-strip canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 7px;
  background: #162624;
}

.pixel-operator {
  align-self: end;
  padding-bottom: 20%;
  color: var(--muted);
  font-family: Georgia, serif;
  font-size: 1.1rem;
  text-align: center;
}

.interaction-row {
  display: grid;
  min-height: 74px;
  grid-template-columns: minmax(0, 1fr) minmax(160px, 230px);
  align-items: center;
  gap: 24px;
  margin-top: 12px;
  border: 1px solid var(--line-dark);
  border-radius: 14px;
  background: #fff;
  padding: 12px 16px;
}

.pose-control,
.loop-control,
.alternate-control {
  min-width: 0;
}

.pose-control {
  display: grid;
  grid-template-columns: minmax(150px, 1fr) minmax(160px, 1.7fr) auto;
  align-items: center;
  gap: 16px;
}

.pose-control[hidden],
.loop-control[hidden],
.alternate-control[hidden] {
  display: none;
}

.pose-control label {
  color: var(--ink-soft);
  font-size: 0.76rem;
  font-weight: 760;
}

.pose-control label span {
  display: block;
  color: var(--coral);
  font-family: var(--mono);
  font-size: 0.7rem;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  appearance: none;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--teal) 0 50%, #d5d7d1 50%);
}

input[type="range"]::-webkit-slider-thumb {
  width: 18px;
  height: 18px;
  appearance: none;
  border: 4px solid #fff;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 1px rgba(19, 36, 34, 0.18), 0 3px 9px rgba(19, 36, 34, 0.22);
  cursor: grab;
}

input[type="range"]::-moz-range-thumb {
  width: 11px;
  height: 11px;
  border: 4px solid #fff;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 1px rgba(19, 36, 34, 0.18);
  cursor: grab;
}

.mini-button,
.control-button,
.segmented button {
  border: 0;
  cursor: pointer;
  font-weight: 780;
}

.mini-button {
  min-height: 38px;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  padding: 7px 14px;
  font-size: 0.72rem;
  white-space: nowrap;
}

.mini-button:hover,
.mini-button:focus-visible {
  background: var(--teal-dark);
  outline: none;
}

.loop-control {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.loop-control strong {
  display: block;
  margin-top: 1px;
  font-size: 0.82rem;
}

.loop-button {
  background: var(--coral);
}

.alternate-control {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.segmented {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  background: #eceae3;
  padding: 3px;
}

.segmented button {
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  padding: 7px 11px;
  font-size: 0.68rem;
}

.segmented button.is-active {
  background: #fff;
  box-shadow: 0 2px 8px rgba(19, 36, 34, 0.12);
  color: var(--ink);
}

.cost-readout {
  display: grid;
  min-width: 0;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 2px 10px;
  border-left: 1px solid var(--line-dark);
  padding-left: 16px;
}

.cost-readout strong {
  font-family: var(--mono);
  font-size: 0.82rem;
  text-align: right;
}

.cost-bar {
  height: 4px;
  grid-column: 1 / -1;
  overflow: hidden;
  border-radius: 99px;
  background: #e2e2dc;
}

.cost-bar i {
  display: block;
  width: 28%;
  height: 100%;
  border-radius: inherit;
  background: var(--teal);
  transition: width 300ms ease, background 300ms ease;
}

.stage-insight {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  align-items: center;
  gap: 9px;
  margin-top: 12px;
  border-radius: 12px;
  background: #e1f0eb;
  padding: 14px 16px;
}

.insight-mark {
  color: var(--teal-dark);
  font-size: 1.2rem;
  font-weight: 800;
}

.stage-insight p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.8rem;
}

.stage-insight code {
  border: 1px solid rgba(15, 113, 102, 0.15);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.65);
  color: var(--teal-dark);
  padding: 6px 9px;
  font-family: var(--mono);
  font-size: 0.65rem;
  white-space: nowrap;
}

.lab-controls {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  margin-top: 18px;
}

.control-button {
  min-height: 46px;
  border: 1px solid var(--line-dark);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  padding: 10px 14px;
  font-size: 0.78rem;
}

.control-button:first-child {
  justify-self: start;
}

.control-button:last-child {
  justify-self: end;
}

.control-button:hover:not(:disabled),
.control-button:focus-visible:not(:disabled) {
  border-color: var(--teal);
  outline: none;
}

.control-button:disabled {
  cursor: not-allowed;
  opacity: 0.38;
}

.play-button {
  border-color: transparent;
  background: #e7e5de;
}

.play-button[aria-pressed="true"] {
  background: #dbece6;
  color: var(--teal-dark);
}

.next-button {
  min-width: 190px;
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}

.next-button:hover,
.next-button:focus-visible {
  border-color: var(--teal-dark) !important;
  background: var(--teal-dark);
}

.factor-section {
  border-top: 1px solid var(--line-dark);
}

.narrow-heading {
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.34fr);
}

.factor-flow {
  display: grid;
  grid-template-columns: 1fr 36px 1fr 36px 1fr 36px 1fr;
  align-items: stretch;
}

.flow-card {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: 315px;
  flex-direction: column;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 24px;
}

.featured-flow {
  border-color: rgba(118, 88, 223, 0.55);
  background: #f1edff;
  box-shadow: 0 16px 38px rgba(80, 55, 155, 0.12);
}

.flow-number {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.flow-icon {
  position: relative;
  display: grid;
  width: 72px;
  height: 72px;
  place-items: center;
  margin: 23px 0;
  border-radius: 16px;
  background: #e5ece8;
  color: var(--teal-dark);
  font-family: Georgia, serif;
  font-size: 2.2rem;
}

.splat-icon i {
  position: absolute;
  width: 34px;
  height: 13px;
  border-radius: 50%;
  background: var(--teal);
  opacity: 0.78;
  transform: rotate(28deg);
}

.splat-icon i:nth-child(2) {
  width: 15px;
  height: 40px;
  background: var(--coral);
  transform: translate(10px, -5px) rotate(32deg);
}

.splat-icon i:nth-child(3) {
  width: 30px;
  height: 11px;
  background: var(--violet);
  transform: translate(-10px, 13px) rotate(-18deg);
}

.residual-icon {
  grid-template-columns: repeat(3, 12px);
  gap: 4px;
}

.residual-icon i {
  height: 36px;
  border-radius: 3px;
  background: var(--teal);
}

.residual-icon i:nth-child(2) {
  height: 53px;
  background: var(--amber);
}

.residual-icon i:nth-child(3) {
  height: 26px;
  background: var(--coral);
}

.jacobian-icon {
  background: #dfd8fb;
  color: var(--violet);
  font-size: 3rem;
}

.factor-icon {
  background: #f9e2dd;
  color: var(--coral);
  font-size: 3.4rem;
}

.flow-card h3 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.flow-card p {
  margin: 8px 0 20px;
  color: var(--muted);
  font-size: 0.83rem;
}

.flow-card code {
  display: block;
  margin-top: auto;
  overflow: auto;
  color: var(--teal-dark);
  font-family: var(--mono);
  font-size: 0.69rem;
  white-space: nowrap;
}

.featured-flow code {
  color: #5d40be;
}

.flow-arrow {
  display: grid;
  place-items: center;
  color: var(--muted);
  font-family: Georgia, serif;
  font-size: 1.3rem;
}

.ownership-grid {
  display: grid;
  grid-template-columns: 1fr 180px 1fr;
  align-items: stretch;
  margin-top: 26px;
}

.ownership-card {
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: #fff;
}

.ownership-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--line-dark);
  padding: 17px 20px;
}

.ownership-head span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.ownership-head strong {
  font-size: 0.82rem;
}

.ownership-card ul {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 24px;
  margin: 0;
  padding: 22px;
  list-style: none;
}

.ownership-card li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

.factor-dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  transform: rotate(45deg);
  background: var(--blue);
}

.factor-dot.odom { background: var(--teal); }
.factor-dot.splat-factor { background: var(--coral); }
.factor-dot.covariance { border-radius: 50%; background: var(--violet); }

.splat-swatch {
  width: 18px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: 50%;
  transform: rotate(-22deg);
}

.splat-swatch.cyan { background: var(--teal); }
.splat-swatch.amber { background: var(--amber); }
.splat-swatch.coral { background: var(--coral); }
.splat-swatch.violet { background: var(--violet); }

.ownership-bridge {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.63rem;
}

.ownership-bridge i {
  margin: 8px 0 3px;
  color: var(--coral);
  font-family: var(--sans);
  font-size: 2rem;
  font-style: normal;
}

.ownership-bridge small {
  color: var(--ink);
  font-weight: 800;
}

.mixer-section {
  display: grid;
  width: 100%;
  max-width: none;
  grid-template-columns: minmax(340px, 0.7fr) minmax(520px, 1.3fr);
  align-items: center;
  gap: clamp(60px, 8vw, 140px);
  background: var(--ink);
  color: #fff;
  padding-inline: clamp(32px, 7vw, 120px);
}

.mixer-copy {
  max-width: 610px;
}

.mixer-copy .section-no {
  color: #77d0c3;
}

.mixer-copy h2 {
  margin-top: 15px;
}

.mixer-copy > p:not(.section-no) {
  max-width: 530px;
  margin: 24px 0 0;
  color: #a8b9b5;
  font-size: 1rem;
}

.factor-toggles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
  margin-top: 34px;
}

.factor-toggle {
  position: relative;
  display: flex;
  min-height: 60px;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.035);
  cursor: pointer;
  padding: 10px 12px;
  transition: border-color 160ms ease, background 160ms ease;
}

.factor-toggle:has(input:checked) {
  border-color: rgba(255, 255, 255, 0.32);
  background: rgba(255, 255, 255, 0.08);
}

.factor-toggle:has(input:disabled) {
  cursor: default;
}

.factor-toggle input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.factor-toggle span {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.77rem;
  font-weight: 760;
}

.factor-toggle span i {
  width: 11px;
  height: 11px;
  border: 2px solid currentColor;
  transform: rotate(45deg);
}

.factor-toggle small {
  color: #7f9691;
  font-size: 0.63rem;
}

.prior-toggle { color: #7ba6ff; }
.odom-toggle { color: #70d7c8; }
.splat-toggle { color: #ff947e; }
.imu-toggle { color: #eac365; }
.loop-toggle { color: #a890ff; grid-column: 1 / -1; }

.mixer-console {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  background: #10211f;
  box-shadow: 0 28px 78px rgba(0, 0, 0, 0.3);
}

.console-head {
  display: flex;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0 18px;
  color: #829a95;
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.mixer-console svg {
  display: block;
  width: 100%;
  height: auto;
}

.posterior-readout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.posterior-readout div {
  display: grid;
  gap: 3px;
  padding: 16px 18px;
}

.posterior-readout div + div {
  border-left: 1px solid rgba(255, 255, 255, 0.1);
}

.posterior-readout span {
  color: #69817d;
  font-family: var(--mono);
  font-size: 0.56rem;
  letter-spacing: 0.06em;
}

.posterior-readout strong {
  color: #dce9e6;
  font-family: var(--mono);
  font-size: 0.83rem;
}

.evidence-section {
  width: min(1500px, calc(100% - clamp(32px, 8vw, 128px)));
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 46px;
}

.metric-grid article {
  display: grid;
  min-height: 180px;
  align-content: space-between;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 24px;
}

.metric-grid span,
.evidence-card figcaption > span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.07em;
}

.metric-grid strong {
  font-family: var(--mono);
  font-size: clamp(1.45rem, 2.7vw, 2.7rem);
  letter-spacing: -0.06em;
}

.metric-grid strong s {
  margin-right: 10px;
  color: #9ba49f;
  font-size: 0.56em;
  font-weight: 500;
}

.metric-grid em {
  color: var(--teal-dark);
  font-size: 0.77rem;
  font-style: normal;
  font-weight: 800;
}

.evidence-grid {
  display: grid;
  grid-template-columns: minmax(340px, 0.78fr) minmax(480px, 1.22fr);
  gap: 18px;
}

.evidence-card {
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.evidence-image {
  display: grid;
  min-height: 360px;
  place-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line-dark);
  background: #ebe8df;
}

.dark-image {
  background: #162826;
}

.evidence-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.evidence-card figcaption {
  padding: 24px;
}

.evidence-card figcaption strong {
  display: block;
  margin-top: 7px;
  font-size: 1.24rem;
  letter-spacing: -0.025em;
}

.evidence-card figcaption p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.kitti-details {
  margin-top: 18px;
  overflow: hidden;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: var(--surface);
}

.kitti-details summary {
  display: flex;
  min-height: 70px;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 14px 22px;
  font-weight: 760;
  list-style: none;
}

.kitti-details summary::-webkit-details-marker {
  display: none;
}

.kitti-details summary small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 500;
}

.kitti-details summary b {
  display: inline-block;
  margin-left: 12px;
  color: var(--teal-dark);
  font-size: 1rem;
  transition: transform 160ms ease;
}

.kitti-details[open] summary b {
  transform: rotate(45deg);
}

.kitti-details > div {
  border-top: 1px solid var(--line-dark);
  padding: clamp(14px, 2vw, 28px);
}

.takeaway {
  width: 100%;
  max-width: none;
  background:
    radial-gradient(circle at 15% 15%, rgba(28, 167, 148, 0.18), transparent 27%),
    radial-gradient(circle at 86% 82%, rgba(118, 88, 223, 0.17), transparent 28%),
    #e5e1d5;
  padding-inline: clamp(32px, 8vw, 140px);
  text-align: center;
}

.takeaway-mark {
  display: grid;
  width: 54px;
  height: 54px;
  place-items: center;
  margin: 0 auto 26px;
  border-radius: 16px;
  background: var(--ink);
  color: var(--coral);
  font-size: 2.5rem;
}

.takeaway .section-no {
  margin-bottom: 18px;
}

.takeaway h2 {
  max-width: 1160px;
  margin-inline: auto;
  font-size: clamp(2.1rem, 4.6vw, 5.1rem);
}

.takeaway > p:not(.section-no) {
  max-width: 720px;
  margin: 28px auto 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.takeaway-actions {
  justify-content: center;
}

.dark-quiet {
  border-color: var(--ink);
  background: transparent;
}

footer {
  display: grid;
  min-height: 112px;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  background: var(--ink);
  color: #fff;
  padding: 20px clamp(24px, 5vw, 80px);
}

footer .brand-mark {
  background: #fff;
  color: var(--ink);
}

footer p {
  margin: 0;
  color: #879b96;
  font-size: 0.74rem;
  text-align: center;
}

footer > a:last-child {
  justify-self: end;
  color: #b8c6c3;
  font-size: 0.74rem;
  font-weight: 700;
  text-decoration: none;
}

@media (max-width: 1180px) {
  .hero {
    min-height: auto;
    grid-template-columns: 1fr 0.86fr;
  }

  .hero h1 {
    font-size: clamp(3.2rem, 7vw, 6rem);
  }

  .lab-layout {
    grid-template-columns: 1fr;
  }

  .step-rail {
    display: grid;
    grid-template-columns: repeat(7, minmax(126px, 1fr));
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line-dark);
  }

  .step-button {
    min-height: 75px;
    border-right: 1px solid rgba(19, 36, 34, 0.09);
    border-bottom: 0;
  }

  .step-button::before {
    width: 100%;
    height: 3px;
    top: auto;
    bottom: 0;
    transform: none;
  }

  .step-button.is-active::before {
    height: 3px;
  }

  .factor-flow {
    grid-template-columns: 1fr 24px 1fr;
    gap: 12px 0;
  }

  .factor-flow .flow-card:nth-of-type(3) {
    grid-column: 1;
  }

  .factor-flow .flow-card:nth-of-type(4) {
    grid-column: 3;
  }

  .factor-flow .flow-arrow:nth-of-type(2) {
    display: none;
  }

  .mixer-section {
    grid-template-columns: 0.78fr 1.22fr;
    gap: 44px;
  }
}

@media (max-width: 900px) {
  .top-links > a:not(.nav-pill) {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 136px;
  }

  .hero-concept {
    width: 100%;
    justify-self: stretch;
  }

  .hero-splats {
    display: none;
  }

  .thesis-grid,
  .section-heading,
  .narrow-heading,
  .stage-copy {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .visual-grid {
    grid-template-columns: 1fr;
  }

  .pixel-strip {
    grid-template-columns: repeat(3, 1fr);
  }

  .pixel-intro {
    grid-column: 1 / -1;
  }

  .pixel-operator {
    display: none;
  }

  .interaction-row {
    grid-template-columns: 1fr;
  }

  .cost-readout {
    border-top: 1px solid var(--line-dark);
    border-left: 0;
    padding-top: 12px;
    padding-left: 0;
  }

  .stage-insight {
    grid-template-columns: 28px 1fr;
  }

  .stage-insight code {
    grid-column: 2;
    width: max-content;
    max-width: 100%;
    overflow: auto;
  }

  .ownership-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .ownership-bridge {
    min-height: 100px;
  }

  .mixer-section {
    grid-template-columns: 1fr;
  }

  .mixer-copy {
    max-width: 780px;
  }

  .evidence-grid {
    grid-template-columns: 1fr;
  }

  .metric-grid {
    grid-template-columns: 1fr 1fr;
  }

  .metric-grid article:last-child {
    grid-column: 1 / -1;
  }

  footer {
    grid-template-columns: 1fr auto;
  }

  footer p {
    display: none;
  }
}

@media (max-width: 620px) {
  .topbar {
    min-height: 66px;
    padding-inline: 16px;
  }

  .brand-name,
  .nav-pill span {
    display: none;
  }

  .nav-pill {
    padding-inline: 12px;
  }

  .hero {
    padding: 116px 20px 68px;
  }

  .hero h1 {
    font-size: clamp(3rem, 15vw, 4.9rem);
  }

  .hero-lede {
    font-size: 0.98rem;
  }

  .hero-actions .button {
    width: 100%;
  }

  .hero-concept {
    padding: 18px;
  }

  .concept-block {
    min-height: 112px;
    padding: 19px;
  }

  .concept-bridge {
    min-height: 66px;
  }

  .section-pad,
  .walkthrough,
  .evidence-section {
    width: calc(100% - 28px);
    padding-block: 74px;
  }

  .mixer-section,
  .takeaway {
    width: 100%;
    padding-inline: 18px;
  }

  .thesis-grid {
    display: block;
  }

  .thesis-copy {
    margin-top: 26px;
  }

  .thesis h2,
  .section-heading h2,
  .mixer-copy h2,
  .takeaway h2 {
    font-size: clamp(2.1rem, 12vw, 3.3rem);
  }

  .lab-topbar {
    grid-template-columns: 1fr auto;
    gap: 12px;
  }

  .lab-progress {
    display: none;
  }

  .lab-main {
    padding: 18px 12px;
  }

  .stage-copy {
    min-height: 0;
    gap: 12px;
  }

  .stage-copy h3 {
    font-size: 1.75rem;
  }

  .visual-panel > figcaption {
    font-size: 0.56rem;
  }

  .pixel-strip {
    gap: 6px;
    padding: 9px;
  }

  .pixel-strip figcaption {
    min-height: 28px;
  }

  .pose-control,
  .alternate-control,
  .loop-control {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .segmented {
    display: grid;
    border-radius: 12px;
  }

  .stage-insight {
    padding: 12px;
  }

  .lab-controls {
    grid-template-columns: 1fr 1fr;
  }

  .play-button {
    display: none;
  }

  .control-button:first-child,
  .control-button:last-child {
    width: 100%;
    min-width: 0;
  }

  .next-button {
    font-size: 0.7rem;
  }

  .factor-flow {
    grid-template-columns: 1fr;
  }

  .factor-flow .flow-card:nth-of-type(3),
  .factor-flow .flow-card:nth-of-type(4) {
    grid-column: 1;
  }

  .flow-arrow {
    min-height: 30px;
    transform: rotate(90deg);
  }

  .factor-flow .flow-arrow:nth-of-type(2) {
    display: grid;
  }

  .flow-card {
    min-height: 270px;
  }

  .ownership-card ul {
    grid-template-columns: 1fr;
  }

  .factor-toggles,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .loop-toggle,
  .metric-grid article:last-child {
    grid-column: auto;
  }

  .posterior-readout div {
    padding: 12px 9px;
  }

  .posterior-readout strong {
    font-size: 0.68rem;
  }

  .evidence-image {
    min-height: 230px;
  }

  .kitti-details summary small {
    display: none;
  }

  footer {
    min-height: 88px;
    padding-inline: 18px;
  }
}

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

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