:root {
  color-scheme: light;
  --paper: #eee8dc;
  --paper-soft: #f6f1e8;
  --surface: rgba(249, 246, 239, 0.82);
  --surface-solid: #f8f4ec;
  --ink: #222621;
  --ink-soft: #53594f;
  --ink-faint: #787d73;
  --line: rgba(34, 38, 33, 0.18);
  --line-strong: rgba(34, 38, 33, 0.34);
  --accent: #db5928;
  --accent-deep: #a73c15;
  --accent-on-contrast: #ff9465;
  --accent-soft: rgba(219, 89, 40, 0.12);
  --accent-faint: rgba(219, 89, 40, 0.06);
  --shadow: 0 28px 70px rgba(64, 54, 42, 0.14);
  --shadow-soft: 0 14px 34px rgba(64, 54, 42, 0.09);
  --panel-radius: 18px;
  --control-radius: 10px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --sans: "Avenir Next", "Helvetica Neue", Arial, ui-sans-serif, system-ui, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --paper: #171916;
  --paper-soft: #1d201c;
  --surface: rgba(30, 33, 29, 0.86);
  --surface-solid: #22251f;
  --ink: #f0eadf;
  --ink-soft: #bcc0b7;
  --ink-faint: #92988e;
  --line: rgba(240, 234, 223, 0.14);
  --line-strong: rgba(240, 234, 223, 0.3);
  --accent: #f2763f;
  --accent-deep: #ff9b6e;
  --accent-on-contrast: #9f3410;
  --accent-soft: rgba(242, 118, 63, 0.14);
  --accent-faint: rgba(242, 118, 63, 0.07);
  --shadow: 0 28px 70px rgba(0, 0, 0, 0.3);
  --shadow-soft: 0 14px 34px rgba(0, 0, 0, 0.23);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 3% 3%, rgba(255, 255, 255, 0.62), transparent 30rem),
    radial-gradient(circle at 96% 17%, var(--accent-faint), transparent 32rem),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  transition: background-color 0.35s ease, color 0.35s ease;
}

html[data-theme="dark"] body {
  background:
    radial-gradient(circle at 3% 3%, rgba(255, 255, 255, 0.045), transparent 30rem),
    radial-gradient(circle at 96% 17%, var(--accent-faint), transparent 32rem),
    var(--paper);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  opacity: 0.28;
  background-image:
    radial-gradient(circle at 18% 22%, rgba(59, 51, 40, 0.18) 0 0.45px, transparent 0.7px),
    radial-gradient(circle at 73% 68%, rgba(59, 51, 40, 0.14) 0 0.4px, transparent 0.7px);
  background-size: 9px 11px, 13px 15px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.65), transparent 92%);
}

html[data-theme="dark"] body::before {
  opacity: 0.12;
}

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

picture {
  display: block;
}

button,
input {
  font: inherit;
}

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

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

p,
h1,
h2,
h3,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 42%, transparent);
  outline-offset: 4px;
}

::selection {
  background: var(--accent);
  color: #fff9f3;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: var(--control-radius);
  background: var(--ink);
  color: var(--paper-soft);
  transform: translateY(-150%);
  transition: transform 0.2s var(--ease);
}

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

.shell {
  width: min(1240px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 12px;
  z-index: 30;
  width: min(1240px, calc(100% - 40px));
  height: 68px;
  margin: 12px auto 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 100%;
  padding: 8px 9px 8px 18px;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: color-mix(in srgb, var(--surface-solid) 80%, transparent);
  box-shadow: var(--shadow-soft), inset 0 1px 0 rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(18px) saturate(125%);
  -webkit-backdrop-filter: blur(18px) saturate(125%);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: max-content;
  font-weight: 760;
  letter-spacing: -0.025em;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 800;
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  width: 8px;
  height: 1px;
  background: var(--line-strong);
  content: "";
}

.brand-mark::before { left: -9px; }
.brand-mark::after { right: -9px; }

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-copy small {
  margin-top: 4px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  color: var(--ink-soft);
  font-size: 0.77rem;
  font-weight: 680;
  white-space: nowrap;
}

.nav-links a {
  padding: 9px 9px;
  border-radius: var(--control-radius);
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s var(--ease);
}

.nav-links a:hover,
.nav-links a.is-current {
  background: var(--accent-soft);
  color: var(--accent-deep);
  transform: translateY(-1px);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-width: max-content;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: var(--control-radius);
  background: var(--surface);
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.7rem;
  font-weight: 740;
  transition: border-color 0.2s ease, transform 0.2s var(--ease), background-color 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.theme-toggle:active,
.button:active,
.segmented button:active,
.layer-button:active {
  transform: translateY(1px) scale(0.99);
}

.theme-symbol {
  position: relative;
  width: 17px;
  height: 17px;
  overflow: hidden;
  border: 1px solid currentColor;
  border-radius: 50%;
}

.theme-symbol::after {
  position: absolute;
  inset: -1px -1px -1px 50%;
  background: currentColor;
  content: "";
}

.section {
  padding: 116px 0;
}

.section-title {
  max-width: 900px;
  font-family: var(--display);
  font-size: clamp(2.45rem, 5.6vw, 5.35rem);
  font-weight: 500;
  letter-spacing: -0.052em;
  line-height: 0.98;
  overflow-wrap: anywhere;
  hyphens: auto;
}

.section-intro {
  max-width: 720px;
  margin-top: 24px;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  line-height: 1.65;
}

.eyebrow {
  margin-bottom: 18px;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 17px;
  border: 1px solid transparent;
  border-radius: var(--control-radius);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  white-space: nowrap;
  transition: transform 0.22s var(--ease), background-color 0.22s ease, border-color 0.22s ease;
}

.button.primary {
  background: var(--ink);
  color: var(--paper-soft);
}

.button.primary:hover {
  background: var(--accent-deep);
  color: var(--paper-soft);
  transform: translateY(-2px);
}

.button.secondary {
  border-color: var(--line-strong);
  background: transparent;
  color: var(--ink);
}

.button.secondary:hover {
  border-color: var(--accent);
  color: var(--accent-deep);
  transform: translateY(-2px);
}

.button:disabled,
.segmented button:disabled,
.layer-button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.hero {
  display: grid;
  min-height: calc(100dvh - 92px);
  grid-template-columns: minmax(0, 0.94fr) minmax(430px, 1.06fr);
  align-items: center;
  gap: clamp(30px, 5vw, 76px);
  padding: 38px 0 46px;
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.hero h1 {
  max-width: 710px;
  font-family: var(--display);
  font-size: clamp(4rem, 6.8vw, 6.45rem);
  font-weight: 500;
  letter-spacing: -0.066em;
  line-height: 0.9;
}

.hero h1 em {
  display: inline-block;
  padding-bottom: 0.08em;
  color: var(--accent-deep);
  font-weight: inherit;
  line-height: 1.1;
}

.hero-subtitle {
  max-width: 555px;
  margin-top: 25px;
  color: var(--ink-soft);
  font-size: clamp(1.04rem, 1.6vw, 1.22rem);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 11px;
  margin-top: 30px;
}

.hero-figure {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: #161814;
  box-shadow: var(--shadow);
}

.hero-figure img {
  width: 100%;
  height: min(60dvh, 530px);
  min-height: 400px;
  object-fit: cover;
}

.image-caption {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 15px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  background: #1b1d19;
  color: #e9e3d7;
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.image-caption span:last-child {
  color: #ff9b6e;
  text-align: right;
}

.fact-band {
  display: grid;
  grid-template-columns: 0.74fr 1.18fr 1.08fr;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.fact {
  min-height: 155px;
  padding: 30px 32px 30px 0;
}

.fact + .fact {
  padding-left: 32px;
  border-left: 1px solid var(--line);
}

.fact strong {
  display: block;
  margin-bottom: 10px;
  color: var(--accent-deep);
  font-family: var(--display);
  font-size: clamp(2rem, 3.4vw, 3.2rem);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 1;
}

.fact span {
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.55;
}

.history-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(330px, 0.88fr);
  gap: clamp(28px, 6vw, 80px);
  align-items: start;
  margin-top: 54px;
}

.history-figure {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--surface-solid);
  box-shadow: var(--shadow-soft);
}

.history-figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.history-copy {
  display: grid;
  gap: 26px;
}

.history-copy > p {
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.72;
}

.history-notes {
  display: grid;
  gap: 0;
  margin-top: 58px;
  grid-template-columns: 1.08fr 0.92fr 1fr;
  border-top: 1px solid var(--line);
}

.history-note {
  padding: 28px 30px 0 0;
}

.history-note + .history-note {
  padding-left: 30px;
  border-left: 1px solid var(--line);
}

.history-note h3,
.anatomy-beat h3,
.pipeline-label,
.timeline-item h3,
.source-title strong {
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.history-note p,
.anatomy-beat p,
.timeline-item p {
  margin-top: 9px;
  color: var(--ink-soft);
  font-size: 0.88rem;
  line-height: 1.6;
}

.callout {
  max-width: 940px;
  margin-top: 48px;
  padding: 22px 0 0 25px;
  border-top: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
}

.callout strong {
  color: var(--ink);
}

.depth-scroll {
  overflow-x: auto;
  margin-top: 52px;
  padding-bottom: 12px;
  scrollbar-color: var(--line-strong) transparent;
}

.depth-stack {
  display: grid;
  min-width: 1040px;
  grid-template-columns: 1.05fr 28px 1fr 28px 1fr 28px 1fr 28px 0.85fr 28px 0.65fr;
  align-items: center;
  gap: 10px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.depth-node {
  position: relative;
  min-height: 154px;
  padding: 22px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-solid);
}

.depth-node::after {
  position: absolute;
  right: -12px;
  bottom: -24px;
  width: 100px;
  height: 100px;
  border: 1px solid var(--line);
  border-radius: 50%;
  content: "";
}

.depth-node small {
  display: block;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.depth-node strong {
  display: block;
  margin-top: 16px;
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 500;
  line-height: 1.08;
}

.depth-node span {
  display: block;
  margin-top: 9px;
  color: var(--ink-faint);
  font-size: 0.76rem;
}

.depth-arrow {
  position: relative;
  height: 1px;
  background: var(--line-strong);
}

.depth-arrow::after {
  position: absolute;
  top: -3px;
  right: 0;
  width: 7px;
  height: 7px;
  border-top: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
  content: "";
  transform: rotate(45deg);
}

.gradient-return {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 1040px;
  margin-top: 14px;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 800;
}

.gradient-return::before {
  height: 1px;
  flex: 1;
  background: repeating-linear-gradient(90deg, var(--accent) 0 10px, transparent 10px 17px);
  content: "";
}

.equation-band {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) 1.1fr;
  align-items: center;
  gap: 38px;
  margin-top: 36px;
  padding: 28px 32px;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--surface);
}

.equation-band strong {
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(1.55rem, 3vw, 2.55rem);
  font-weight: 500;
  letter-spacing: -0.035em;
}

.equation-band span {
  color: var(--ink-soft);
}

.anatomy-beats {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 0.9fr 1.1fr;
  gap: 24px;
  margin-top: 44px;
}

.anatomy-beat {
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.lab-section {
  position: relative;
}

.lab-shell {
  margin-top: 48px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.lab-controls {
  display: grid;
  grid-template-columns: 1fr 1.1fr auto;
  gap: 20px;
  align-items: end;
  padding: 24px;
  border-bottom: 1px solid var(--line);
}

.control-group {
  min-width: 0;
}

.control-label {
  display: block;
  margin-bottom: 9px;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.segmented {
  display: flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper-soft);
}

.segmented button,
.layer-button {
  min-height: 44px;
  flex: 1;
  padding: 8px 10px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 780;
  white-space: nowrap;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s var(--ease);
}

.segmented button[aria-pressed="true"],
.layer-button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper-soft);
}

.lab-actions {
  display: flex;
  gap: 8px;
}

.lab-stage {
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  min-height: 520px;
}

.input-panel,
.feature-panel {
  padding: 28px;
}

.input-panel {
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface-solid) 72%, transparent);
}

.panel-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.panel-heading h3 {
  font-size: 0.92rem;
  font-weight: 800;
}

.panel-heading span {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.63rem;
}

.pixel-grid {
  display: grid;
  width: min(100%, 360px);
  aspect-ratio: 1;
  grid-template-columns: repeat(8, 1fr);
  gap: 3px;
  margin: 0 auto;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper);
}

.pixel {
  border-radius: 3px;
  background: color-mix(in srgb, var(--ink) calc(var(--v) * 100%), var(--paper-soft));
  transition: background-color 0.28s ease, transform 0.28s var(--ease);
}

.pixel.is-changed {
  box-shadow: inset 0 0 0 2px var(--accent);
}

.input-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 22px;
}

.metric {
  padding-top: 13px;
  border-top: 1px solid var(--line);
}

.metric span {
  display: block;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.metric strong {
  display: block;
  margin-top: 4px;
  font-family: var(--display);
  font-size: 1.6rem;
  font-weight: 500;
}

.network-path {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 7px;
  margin-bottom: 24px;
}

.layer-button {
  position: relative;
  min-height: 52px;
  border: 1px solid var(--line);
  background: var(--surface-solid);
}

.layer-button + .layer-button::before {
  position: absolute;
  top: 50%;
  left: -8px;
  width: 8px;
  height: 1px;
  background: var(--line-strong);
  content: "";
}

.activation-field {
  display: grid;
  min-height: 260px;
  place-items: center;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper-soft);
}

.activation-grid {
  display: grid;
  width: min(100%, 430px);
  grid-template-columns: repeat(var(--cols, 4), minmax(34px, 1fr));
  gap: 9px;
}

.activation-cell {
  display: grid;
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: color-mix(in srgb, var(--accent) calc(var(--a) * 72%), var(--surface-solid));
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 800;
  transition: background-color 0.28s ease, transform 0.28s var(--ease), opacity 0.28s ease;
}

.class-output {
  width: min(100%, 460px);
}

.class-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.class-row:first-child {
  color: var(--accent-deep);
}

.class-row span {
  font-weight: 760;
}

.class-row strong {
  font-family: var(--mono);
  font-size: 0.78rem;
}

.feature-narration {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
  margin-top: 22px;
}

.feature-narration strong {
  display: block;
  font-size: 0.92rem;
}

.feature-narration p {
  max-width: 620px;
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.stability-readout {
  min-width: 128px;
  padding-left: 20px;
  border-left: 1px solid var(--line);
}

.stability-readout span {
  display: block;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.stability-readout strong {
  margin-top: 3px;
  color: var(--accent-deep);
  font-family: var(--display);
  font-size: 1.55rem;
  font-weight: 500;
}

.lab-note {
  padding: 16px 24px;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 0.78rem;
}

.lab-note strong {
  color: var(--ink-soft);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.checkpoint-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.depth-buttons {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
}

.trace-buttons {
  width: 170px;
}

.moons-stage {
  display: grid;
  grid-template-columns: minmax(390px, 0.92fr) minmax(0, 1.08fr);
  min-height: 610px;
}

.plot-panel,
.feature-panel {
  padding: 28px;
}

.plot-panel {
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface-solid) 72%, transparent);
}

.plot-wrap {
  display: grid;
  place-items: center;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper-soft);
}

.representation-plot {
  width: min(100%, 500px);
  overflow: visible;
}

.plot-grid line {
  stroke: var(--line);
  stroke-width: 1;
}

.data-point {
  transform-box: view-box;
  transform-origin: 0 0;
  transition: transform 0.52s var(--ease), opacity 0.3s ease;
}

.data-point.is-upper > circle:first-child {
  fill: var(--ink);
  stroke: var(--paper-soft);
  stroke-width: 1.5;
}

.data-point.is-lower > path {
  fill: var(--paper-soft);
  stroke: var(--accent);
  stroke-width: 2.4;
}

.trace-ring {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  opacity: 0;
  vector-effect: non-scaling-stroke;
}

.data-point.is-traced .trace-ring {
  opacity: 1;
}

.decision-line {
  stroke: var(--accent);
  stroke-width: 3;
  stroke-dasharray: 10 7;
  vector-effect: non-scaling-stroke;
}

.plot-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 16px;
  color: var(--ink-faint);
  font-size: 0.72rem;
}

.plot-legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.plot-legend i {
  display: inline-block;
  width: 12px;
  height: 12px;
}

.legend-upper {
  border-radius: 50%;
  background: var(--ink);
}

.legend-lower {
  border: 2px solid var(--accent);
  background: var(--paper-soft);
  transform: rotate(45deg) scale(0.78);
}

.legend-trace {
  border: 2px solid var(--accent);
  border-radius: 50%;
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.lab-narration {
  margin-top: 28px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.lab-narration strong {
  display: block;
  max-width: 660px;
  font-family: var(--display);
  font-size: clamp(1.35rem, 2.2vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.lab-narration p {
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.trace-panel {
  margin-top: 26px;
}

.trace-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
}

.trace-head .control-label {
  margin-bottom: 4px;
}

.trace-head strong {
  font-size: 0.9rem;
}

.trace-journey {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
  margin-top: 15px;
}

.trace-journey > div {
  min-width: 0;
  padding: 13px 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface-solid);
}

.trace-journey > div.is-current {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.trace-journey span {
  display: block;
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.56rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.trace-journey strong {
  display: block;
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 0.58rem;
  line-height: 1.38;
  white-space: pre-line;
}

.modern-bridge-mini {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.modern-bridge-mini div {
  min-width: 0;
}

.modern-bridge-mini strong,
.modern-bridge-mini span {
  display: block;
}

.modern-bridge-mini strong {
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.62rem;
  text-transform: uppercase;
}

.modern-bridge-mini span {
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 0.72rem;
  line-height: 1.5;
}

.pipeline-board {
  display: grid;
  gap: 22px;
  margin-top: 52px;
}

.pipeline {
  display: grid;
  grid-template-columns: 160px 1fr;
  min-height: 154px;
  border-top: 1px solid var(--line);
}

.pipeline-label {
  padding: 28px 22px 28px 0;
  color: var(--ink-soft);
}

.pipeline-flow {
  display: grid;
  grid-template-columns: 1fr 34px 1.2fr 34px 1fr;
  align-items: center;
  gap: 12px;
  padding: 24px 0 24px 30px;
  border-left: 1px solid var(--line);
}

.pipeline-step {
  min-height: 90px;
  padding: 18px;
  border-radius: 12px;
  background: var(--surface);
}

.pipeline.deep .pipeline-step:nth-of-type(2) {
  border: 1px solid var(--accent);
  background: var(--accent-soft);
}

.pipeline-step small {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pipeline-step strong {
  display: block;
  margin-top: 8px;
  font-family: var(--display);
  font-size: 1.18rem;
  font-weight: 500;
  line-height: 1.15;
}

.pipeline-arrow {
  color: var(--ink-faint);
  font-family: var(--mono);
  text-align: center;
}

.representation-summary {
  max-width: 850px;
  margin-top: 46px;
  font-family: var(--display);
  font-size: clamp(1.45rem, 2.8vw, 2.4rem);
  line-height: 1.22;
  letter-spacing: -0.025em;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(7, minmax(190px, 1fr));
  gap: 24px;
  min-width: 1250px;
  margin-top: 50px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.timeline-wrap {
  overflow-x: auto;
  padding-bottom: 18px;
  scroll-snap-type: x mandatory;
}

.timeline-item {
  position: relative;
  scroll-snap-align: start;
}

.timeline-item::before {
  position: absolute;
  top: -31px;
  left: 0;
  width: 9px;
  height: 9px;
  border: 2px solid var(--paper);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
  content: "";
}

.timeline-year {
  margin-bottom: 13px;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 800;
}

.timeline-item a:hover h3 {
  color: var(--accent-deep);
}

.modern-grid {
  display: grid;
  grid-template-columns: 0.72fr 1fr 1fr;
  margin-top: 50px;
  border-top: 1px solid var(--line);
}

.modern-head,
.modern-cell {
  min-height: 88px;
  padding: 22px;
  border-bottom: 1px solid var(--line);
}

.modern-grid > :nth-child(3n + 2),
.modern-grid > :nth-child(3n + 3) {
  border-left: 1px solid var(--line);
}

.modern-head {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.modern-head.accent {
  color: var(--accent-deep);
}

.modern-cell {
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.modern-cell.label {
  color: var(--ink);
  font-weight: 780;
}

.modern-aside {
  display: grid;
  grid-template-columns: 0.48fr 1.52fr;
  gap: 40px;
  margin-top: 46px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--panel-radius);
  background: var(--surface);
}

.modern-aside h3 {
  font-family: var(--display);
  font-size: 1.8rem;
  font-weight: 500;
  letter-spacing: -0.03em;
}

.modern-aside p {
  color: var(--ink-soft);
}

.closing {
  padding-top: 62px;
  border-top: 1px solid var(--line);
}

.closing p {
  max-width: 720px;
  margin-top: 26px;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.closing-sequence {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 15px;
  margin-top: 45px;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 800;
}

.closing-sequence span {
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--control-radius);
  background: var(--surface);
}

.closing-sequence b {
  color: var(--accent-deep);
}

.sources-header {
  margin-bottom: 46px;
}

.source-list {
  border-top: 1px solid var(--line);
}

.source-link {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  min-height: 104px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  transition: color 0.2s ease, transform 0.2s var(--ease);
}

.source-link:hover {
  color: var(--accent-deep);
  transform: translateX(4px);
}

.source-year,
.source-action {
  color: var(--ink-faint);
  font-family: var(--mono);
  font-size: 0.67rem;
  font-weight: 800;
}

.source-title span {
  display: block;
  margin-top: 4px;
  color: var(--ink-faint);
  font-size: 0.78rem;
}

.source-note {
  max-width: 820px;
  margin-top: 28px;
  color: var(--ink-faint);
  font-size: 0.8rem;
}

footer {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 20px;
  align-items: center;
  min-height: 104px;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: 0.76rem;
}

footer.has-next {
  grid-template-columns: minmax(0, 1fr) repeat(3, auto);
}

footer a {
  color: var(--ink-soft);
  font-weight: 760;
}

footer a:hover {
  color: var(--accent-deep);
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

@media (max-width: 1040px) {
  .nav-links a {
    padding-inline: 7px;
    font-size: 0.7rem;
  }

  .hero {
    grid-template-columns: minmax(0, 0.96fr) minmax(380px, 1.04fr);
    gap: 34px;
  }

  .hero h1 {
    font-size: clamp(3.7rem, 7vw, 5.2rem);
  }

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

  .lab-actions {
    grid-column: 1 / -1;
  }

  .history-grid {
    grid-template-columns: 1fr 0.86fr;
  }
}

@media (max-width: 800px) {
  .shell,
  .site-header {
    width: min(100% - 28px, 1240px);
  }

  .nav-links {
    display: none;
  }

  .section {
    padding: 84px 0;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 26px;
    padding: 38px 0 50px;
  }

  .hero h1 {
    max-width: 650px;
    font-size: clamp(3.25rem, 13.5vw, 5.5rem);
  }

  .hero-subtitle {
    margin-top: 18px;
  }

  .hero-actions {
    margin-top: 22px;
  }

  .hero-figure img {
    height: clamp(240px, 40dvh, 360px);
    min-height: 0;
  }

  .fact-band,
  .history-grid,
  .history-notes,
  .equation-band,
  .anatomy-beats,
  .lab-stage,
  .moons-stage,
  .modern-aside {
    grid-template-columns: 1fr;
  }

  .fact {
    min-height: auto;
    padding: 22px 0;
  }

  .fact + .fact {
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .history-grid {
    margin-top: 40px;
  }

  .history-copy {
    order: -1;
  }

  .history-note {
    padding: 22px 0;
  }

  .history-note + .history-note {
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .anatomy-beats {
    gap: 0;
  }

  .anatomy-beat {
    padding: 20px 0;
  }

  .input-panel {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .plot-panel {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .pixel-grid {
    width: min(100%, 330px);
  }

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

  .pipeline-label {
    padding-bottom: 10px;
  }

  .pipeline-flow {
    padding-left: 0;
    border-left: 0;
  }

  .modern-grid {
    grid-template-columns: 0.72fr 1fr 1fr;
    overflow-x: auto;
  }

  .modern-grid > * {
    min-width: 180px;
  }

  footer,
  footer.has-next {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 28px 0;
  }
}

@media (max-width: 560px) {
  .topbar {
    gap: 8px;
    padding-left: 10px;
  }

  .brand {
    min-width: 0;
    gap: 8px;
    font-size: 0.82rem;
  }

  .brand-copy {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .brand-copy small,
  .theme-toggle > span:last-child {
    display: none;
  }

  .hero {
    gap: 20px;
    padding-top: 28px;
  }

  .hero h1 {
    font-size: clamp(3.1rem, 15.5vw, 4.45rem);
    line-height: 0.91;
  }

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

  .hero-actions,
  .lab-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

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

  .image-caption {
    display: grid;
    gap: 4px;
  }

  .image-caption span:last-child {
    text-align: left;
  }

  .section-title {
    font-size: clamp(2.4rem, 13vw, 4.3rem);
  }

  .lab-controls {
    grid-template-columns: 1fr;
    padding: 18px;
  }

  .lab-actions {
    grid-column: auto;
  }

  .segmented {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .input-panel,
  .feature-panel,
  .plot-panel {
    padding: 20px;
  }

  .network-path {
    grid-template-columns: 1fr 1fr;
  }

  .layer-button + .layer-button::before {
    display: none;
  }

  .activation-field {
    min-height: 230px;
    padding: 14px;
  }

  .activation-grid {
    gap: 6px;
  }

  .feature-narration {
    grid-template-columns: 1fr;
  }

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

  .trace-head {
    align-items: stretch;
    flex-direction: column;
  }

  .trace-buttons {
    width: 100%;
  }

  .trace-journey {
    grid-template-columns: 1fr 1fr;
  }

  .modern-bridge-mini {
    grid-template-columns: 1fr;
  }

  .stability-readout {
    padding: 15px 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

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

  .pipeline-arrow {
    transform: rotate(90deg);
  }

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

  .source-action {
    display: none;
  }

  .closing-sequence {
    gap: 9px;
  }
}

@media (max-width: 390px) {
  .hero h1 {
    font-size: 3rem;
  }

  .hero-actions,
  .lab-actions {
    grid-template-columns: 1fr;
  }

  .theme-toggle {
    padding-inline: 10px;
  }
}

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

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

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

@media (prefers-reduced-transparency: reduce) {
  .topbar,
  .surface {
    background: var(--surface-solid);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}