:root {
  --paper: #fbfaf6;
  --ink: #171817;
  --muted: #5f625e;
  --soft: #f0ece4;
  --line: #d7cdbc;
  --panel: rgba(255, 255, 255, 0.84);
  --panel-strong: #ffffff;
  --accent: #0f6f68;
  --accent-deep: #084a45;
  --red: #a9432f;
  --gold: #9a6d19;
  --blue: #314f78;
  --code: #f3efe8;
  --shadow: 0 18px 46px rgba(45, 36, 23, 0.09);
  --serif: Georgia, "Times New Roman", "Noto Serif SC", serif;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  --mono: "SFMono-Regular", "Cascadia Mono", "Liberation Mono", Menlo, monospace;
}

html[data-theme="dark"] {
  --paper: #101213;
  --ink: #f4efe6;
  --muted: #b9b2a8;
  --soft: #181c1d;
  --line: #343b3d;
  --panel: rgba(27, 30, 31, 0.92);
  --panel-strong: #222729;
  --accent: #51b8c8;
  --accent-deep: #9ee8f2;
  --red: #d66f5d;
  --gold: #d89b47;
  --blue: #82aee3;
  --code: #0b0d0e;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
  color-scheme: dark;
}

html[data-theme="dark"] body {
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px) 0 0 / 42px 42px,
    linear-gradient(0deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px) 0 0 / 42px 42px,
    radial-gradient(circle at 18% 4%, rgba(216, 155, 71, 0.10), transparent 34rem),
    var(--paper);
}

html[data-theme="dark"] .site-header {
  background: rgba(16, 18, 19, 0.92);
}

html[data-theme="dark"] .project-link,
html[data-theme="dark"] .module-nav a,
html[data-theme="dark"] .page-footer a {
  color: var(--muted);
  background: rgba(255, 255, 255, 0.04);
}

html[data-theme="dark"] .module-nav a:first-child {
  color: #e8fbff;
  background: rgba(81, 184, 200, 0.12);
}

html[data-theme="dark"] .method-block.boundary,
html[data-theme="dark"] .source-note,
html[data-theme="dark"] .summary-matrix,
html[data-theme="dark"] .overview-diagram,
html[data-theme="dark"] .lab-bars,
html[data-theme="dark"] .lab-readout,
html[data-theme="dark"] .lab-explanation {
  background: var(--panel);
}

html[data-theme="dark"] .flow-node,
html[data-theme="dark"] .lab-bar,
html[data-theme="dark"] .lab-token,
html[data-theme="dark"] .canvas-stage,
html[data-theme="dark"] .matrix-cell {
  background: var(--panel-strong);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  background:
    linear-gradient(90deg, rgba(23, 24, 23, 0.035) 1px, transparent 1px) 0 0 / 42px 42px,
    linear-gradient(0deg, rgba(23, 24, 23, 0.028) 1px, transparent 1px) 0 0 / 42px 42px,
    radial-gradient(circle at 18% 4%, rgba(154, 109, 25, 0.09), transparent 34rem),
    var(--paper);
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 50;
  width: 1px;
  height: 1px;
  padding: 0.55rem 0.75rem;
  overflow: hidden;
  color: #fff;
  text-decoration: none;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  background: var(--ink);
  border-radius: 4px;
}

.skip-link:focus {
  width: auto;
  height: auto;
  overflow: visible;
  clip: auto;
  clip-path: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.85rem max(1rem, calc((100vw - 1040px) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(251, 250, 246, 0.94);
  backdrop-filter: blur(14px);
}

.brand,
.project-link,
.module-nav a,
.page-footer a {
  text-decoration: none;
}

.brand {
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 800;
}

.module-nav {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.project-link,
.module-nav a {
  padding: 0.42rem 0.62rem;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.62);
}

.module-nav a:first-child {
  color: var(--accent-deep);
  background: rgba(15, 111, 104, 0.08);
}

.project-link:hover,
.project-link:focus-visible,
.module-nav a:hover,
.module-nav a:focus-visible {
  color: #fff;
  background: var(--accent);
  outline: none;
}

.lecture {
  width: min(100% - 2rem, 980px);
  margin: 0 auto;
  padding: 2rem 0 4rem;
}

.paper-header {
  padding: 3.4rem 0 2.3rem;
  border-bottom: 3px double var(--line);
}

.kicker {
  margin: 0 0 0.82rem;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

.paper-header h1 {
  max-width: 820px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3rem, 8vw, 5.6rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.subtitle {
  max-width: 800px;
  margin: 1.2rem 0 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(1.18rem, 2.2vw, 1.58rem);
  line-height: 1.42;
}

.chapter {
  padding: 4rem 0 0;
}

.chapter h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.12;
  letter-spacing: 0;
}

.chapter h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.34rem;
  line-height: 1.28;
}

.chapter h4 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.28;
}

.chapter p,
.chapter li {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.84;
  overflow-wrap: anywhere;
}

.chapter p {
  margin: 1rem 0 0;
}

.problem {
  padding-top: 3.5rem;
}

.principle-grid,
.two-column {
  display: grid;
  gap: 1rem;
  margin-top: 1.2rem;
}

.principle-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.principle-grid article,
.derivation-section,
.algorithm-panel,
.derivation-widget,
.calculator-inline,
.score-lab,
.visual-example,
.method-block {
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.principle-grid article {
  padding: 1rem;
}

.principle-grid h3 {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.15rem;
}

.interface-table {
  display: grid;
  gap: 0;
  margin-top: 1.25rem;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.interface-row {
  display: grid;
  grid-template-columns: 1.05fr 1.55fr 1.45fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.interface-row:first-child {
  border-top: 0;
}

.interface-row span {
  min-width: 0;
  padding: 0.82rem 0.9rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.58;
  border-left: 1px solid var(--line);
  overflow-wrap: anywhere;
}

.interface-row span:first-child {
  border-left: 0;
  color: var(--ink);
  font-weight: 750;
}

.interface-head {
  background: rgba(15, 111, 104, 0.08);
}

.interface-head span {
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 850;
  text-transform: uppercase;
}

.derivation-section,
.method-block {
  margin-top: 1.1rem;
  padding: 1.2rem;
}

.method-block {
  background: rgba(255, 255, 255, 0.78);
}

.method-block.boundary {
  border-color: rgba(169, 67, 47, 0.45);
  background: rgba(255, 248, 242, 0.88);
}

.equation {
  max-width: 100%;
  margin: 1rem 0;
  padding: 0.92rem 1rem;
  overflow-x: auto;
  overflow-y: hidden;
  color: var(--ink);
  font-size: 0.98rem;
  line-height: 1.62;
  border-left: 4px solid var(--red);
  background: var(--code);
}

.lecture mjx-container[display="true"] {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.08rem 0;
}

.lecture p mjx-container:not([display="true"]),
.lecture li mjx-container:not([display="true"]) {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  vertical-align: middle;
}

.panel-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.panel-title h3 {
  margin: 0;
}

.algorithm-panel,
.derivation-widget,
.calculator-inline,
.score-lab,
.visual-example {
  margin-top: 1.1rem;
  padding: 1.1rem;
}

.sampling-steps,
.judgement-card {
  margin-top: 1.1rem;
  padding: 1.1rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
}

.sampling-steps {
  border-color: rgba(49, 79, 120, 0.35);
}

.sampling-steps h3,
.judgement-card h3 {
  margin-bottom: 0.8rem;
}

.judgement-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.judgement-grid > div {
  min-width: 0;
  padding: 0.85rem;
  border: 1px solid var(--line);
  background: rgba(251, 250, 246, 0.74);
}

.judgement-grid strong {
  display: block;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
}

.judgement-grid p {
  margin-top: 0.45rem;
}

.check-list,
.diagnostic-list {
  display: grid;
  gap: 0.5rem;
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
}

.check-list li,
.diagnostic-list li {
  padding: 0.65rem 0.75rem;
  color: var(--muted);
  line-height: 1.65;
  border-left: 3px solid var(--accent);
  background: var(--code);
}

.visual-example {
  display: grid;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.82);
}

.visual-copy h3 {
  margin: 0;
}

.visual-copy p {
  margin-top: 0.55rem;
}

.diagram-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.6rem;
  align-items: stretch;
}

.flow-node,
.flow-arrow {
  min-width: 0;
  padding: 0.8rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.88);
}

.flow-node {
  display: grid;
  gap: 0.28rem;
  min-height: 5.4rem;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.86rem;
}

.flow-node small {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.78rem;
  line-height: 1.35;
}

.flow-arrow {
  display: grid;
  place-items: center;
  color: var(--accent-deep);
  font-weight: 850;
  text-transform: uppercase;
}

.node-title {
  color: var(--accent-deep);
  font-weight: 850;
}

.overview-diagram {
  grid-template-columns: minmax(0, 1.2fr) 0.55fr minmax(0, 1.2fr) 0.55fr minmax(0, 1.2fr);
}

.vae-flow {
  grid-template-columns: minmax(0, 1fr) minmax(4.75rem, 0.55fr) minmax(0, 1fr) minmax(4.75rem, 0.55fr) minmax(0, 1fr) minmax(4.75rem, 0.55fr) minmax(0, 1fr);
}

.vae-flow .flow-arrow {
  padding-inline: 0.48rem;
  font-size: 0.78rem;
  line-height: 1.25;
  text-align: center;
  text-transform: none;
  white-space: nowrap;
  overflow-wrap: normal;
  border-color: rgba(15, 111, 104, 0.28);
  background: rgba(15, 111, 104, 0.035);
}

.vae-flow .flow-node {
  min-height: 5.1rem;
  padding: 0.76rem;
}

.latent-node {
  border-color: rgba(15, 111, 104, 0.55);
  background: rgba(15, 111, 104, 0.08);
}

.generator-node {
  border-color: rgba(49, 79, 120, 0.5);
  background: rgba(49, 79, 120, 0.08);
}

.output-node {
  border-color: rgba(169, 67, 47, 0.45);
  background: rgba(169, 67, 47, 0.08);
}

.latent-pipeline {
  grid-template-columns: minmax(0, 1fr) 0.62fr minmax(0, 1.25fr) 0.74fr minmax(0, 1.3fr) 0.62fr minmax(0, 1fr);
}

.latent-pipeline .flow-arrow {
  font-size: 0.74rem;
  text-transform: none;
  text-align: center;
  white-space: nowrap;
  overflow-wrap: normal;
}

.position-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1rem;
}

.position-grid article {
  min-width: 0;
  padding: 0.9rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}

.position-grid strong {
  display: block;
  margin-bottom: 0.42rem;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 850;
  text-transform: uppercase;
}

.tradeoff-mini,
.comparison-bars {
  display: grid;
  gap: 0.65rem;
}

.tradeoff-mini > div,
.comparison-bars > div {
  display: grid;
  grid-template-columns: minmax(0, 11rem) minmax(0, 1fr);
  gap: 0.75rem;
  align-items: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.tradeoff-mini i,
.comparison-bars i {
  display: block;
  height: 0.72rem;
  overflow: hidden;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.9);
}

.tradeoff-mini i::before,
.comparison-bars i::before {
  display: block;
  width: var(--level, 50%);
  height: 100%;
  content: "";
  background: linear-gradient(90deg, var(--accent), var(--gold));
}

.vq-grid,
.bridge-grid,
.post-panels,
.ar-grid-wrap {
  display: grid;
  gap: 1rem;
}

.vq-grid {
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
}

.latent-plane {
  position: relative;
  min-height: 260px;
  border: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(15, 111, 104, 0.06) 1px, transparent 1px) 0 0 / 32px 32px,
    linear-gradient(0deg, rgba(15, 111, 104, 0.06) 1px, transparent 1px) 0 0 / 32px 32px,
    #fff;
}

.latent-point {
  position: absolute;
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  color: #fff;
  font-family: var(--mono);
  font-size: 0.78rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 10px 26px rgba(15, 111, 104, 0.22);
}

.input-point {
  left: 54%;
  top: 38%;
  color: var(--ink);
  background: #fff;
  border: 2px solid var(--red);
  z-index: 2;
}

.code {
  background: var(--blue);
}

.c1 { left: 18%; top: 22%; }
.c2 { left: 70%; top: 20%; }
.c3 { left: 36%; top: 68%; }
.c4 { left: 66%; top: 62%; }

.nearest-line {
  position: absolute;
  left: 56%;
  top: 46%;
  width: 16%;
  height: 2px;
  transform: rotate(-30deg);
  transform-origin: left center;
  background: var(--red);
}

.token-grid,
.causal-mask,
.token-bars {
  display: grid;
  gap: 0.28rem;
}

.token-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-content: center;
  padding: 0.7rem;
  border: 1px solid var(--line);
  background: var(--code);
}

.token-grid span,
.causal-mask span {
  display: grid;
  place-items: center;
  min-height: 2.3rem;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.78rem;
  border: 1px solid var(--line);
  background: #fff;
}

.code-usage-card {
  padding: 0.85rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
}

.code-usage-bars {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.75rem;
}

.code-usage-row {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr) 3.8rem;
  gap: 0.55rem;
  align-items: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.8rem;
}

.code-usage-row i {
  display: block;
  height: 0.7rem;
  border: 1px solid var(--line);
  background: linear-gradient(90deg, var(--accent) var(--usage), rgba(255, 255, 255, 0.85) 0);
}

.code-usage-row.low i {
  background: linear-gradient(90deg, var(--red) var(--usage), rgba(255, 255, 255, 0.85) 0);
}

.code-usage-row.high i {
  background: linear-gradient(90deg, var(--gold) var(--usage), rgba(255, 255, 255, 0.85) 0);
}

.distribution-demo,
.trajectory-demo,
.bridge-visual {
  grid-template-columns: 280px minmax(0, 1fr);
  align-items: start;
}

.compact {
  margin-top: 0.85rem;
}

.visual-example canvas {
  display: block;
  width: 100%;
  min-height: 280px;
  border: 1px solid var(--line);
  background: #fff;
}

.noise-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.7rem;
}

.noise-card,
.score-card {
  min-height: 8rem;
  padding: 0.8rem;
  border: 1px solid var(--line);
  background: #fff;
}

.noise-card span,
.score-card span {
  display: block;
  color: var(--accent-deep);
  font-family: var(--mono);
  font-weight: 850;
}

.noise-card small,
.score-card small {
  color: var(--muted);
}

.noise-card i {
  display: block;
  height: 4.4rem;
  margin: 0.65rem 0;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(15, 111, 104, 0.12), rgba(49, 79, 120, 0.12));
}

.noise-card.mild i {
  background:
    radial-gradient(circle at 20% 30%, rgba(169, 67, 47, 0.35), transparent 16%),
    radial-gradient(circle at 70% 65%, rgba(15, 111, 104, 0.28), transparent 18%),
    repeating-linear-gradient(45deg, rgba(23, 24, 23, 0.1) 0 3px, transparent 3px 8px),
    #fff;
}

.noise-card.noisy i {
  background:
    radial-gradient(circle at 12% 18%, rgba(23, 24, 23, 0.24), transparent 5%),
    radial-gradient(circle at 70% 40%, rgba(23, 24, 23, 0.22), transparent 6%),
    radial-gradient(circle at 40% 80%, rgba(23, 24, 23, 0.2), transparent 7%),
    repeating-linear-gradient(30deg, rgba(23, 24, 23, 0.16) 0 2px, transparent 2px 5px),
    #fff;
}

.score-card {
  display: grid;
  align-content: center;
  gap: 0.6rem;
  border-color: rgba(15, 111, 104, 0.48);
  background: rgba(15, 111, 104, 0.08);
}

.temperature-control {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.45rem;
  align-items: center;
  margin-top: 0.85rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.temperature-control input {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--accent);
}

.ar-grid-wrap {
  grid-template-columns: 260px minmax(0, 1fr);
}

.causal-mask {
  grid-template-columns: repeat(7, minmax(0, 1fr));
  padding: 0.7rem;
  border: 1px solid var(--line);
  background: var(--code);
}

.causal-mask span.allowed {
  color: #fff;
  background: var(--accent);
}

.token-bars {
  align-content: center;
  padding: 0.8rem;
  border: 1px solid var(--line);
  background: #fff;
}

.token-bar {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr) 3.2rem;
  gap: 0.55rem;
  align-items: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.token-bar i {
  display: block;
  height: 0.78rem;
  border: 1px solid var(--line);
  background: linear-gradient(90deg, var(--accent) var(--level), transparent 0);
}

.bridge-grid {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.warp-svg,
.bridge-grid canvas {
  width: 100%;
  min-height: 260px;
  border: 1px solid var(--line);
  background: #fff;
}

.warp-svg path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.4;
}

.warp-svg text {
  fill: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

.post-visual {
  grid-template-columns: 280px minmax(0, 1fr);
}

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

.post-panel,
.trajectory-credit {
  min-width: 0;
  padding: 0.8rem;
  border: 1px solid var(--line);
  background: #fff;
}

.post-panel {
  display: grid;
  gap: 0.45rem;
}

.post-panel strong {
  color: var(--accent-deep);
}

.post-panel span {
  padding: 0.42rem 0.5rem;
  color: var(--muted);
  border: 1px solid var(--line);
  background: var(--code);
}

.comparison-bars {
  grid-column: 1 / -1;
  padding: 0.8rem;
  border: 1px solid var(--line);
  background: #fff;
}

.trajectory-credit {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.45rem;
  align-items: center;
}

.trajectory-credit span,
.trajectory-credit b {
  display: grid;
  place-items: center;
  min-height: 2.8rem;
  color: var(--ink);
  font-family: var(--mono);
  border: 1px solid var(--line);
  background: var(--code);
}

.trajectory-credit b {
  color: #fff;
  background: var(--red);
}

.segmented,
.step-buttons,
.lab-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.segmented button,
.step-buttons button,
.lab-controls button {
  min-height: 2.34rem;
  padding: 0.5rem 0.75rem;
  color: var(--ink);
  font-size: 0.88rem;
  font-weight: 820;
  cursor: pointer;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.86);
}

.segmented button:hover,
.segmented button:focus-visible,
.segmented button.active,
.step-buttons button:hover,
.step-buttons button:focus-visible,
.lab-controls button:hover,
.lab-controls button:focus-visible,
.lab-controls button.active {
  color: #fff;
  border-color: var(--accent);
  background: var(--accent);
  outline: none;
}

.algorithm {
  margin: 0;
  padding: 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: #20231f;
}

.algorithm code {
  display: block;
  min-width: 0;
  padding: 1rem;
  color: #eef4ef;
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 1.64;
  white-space: pre;
}

.step-card {
  min-height: 10rem;
  padding: 1rem;
  border: 1px solid var(--line);
  background: var(--panel-strong);
}

.step-card .step-count {
  margin: 0 0 0.45rem;
  color: var(--gold);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 850;
}

.step-card h4 {
  margin-bottom: 0.7rem;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 0.8rem;
}

.calculator-inline label,
.lab-controls label,
.wide-input {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.45rem;
  align-items: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.calculator-inline input[type="range"],
.lab-controls input[type="range"] {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--accent);
}

.calculator-inline input[type="text"] {
  grid-column: 1 / -1;
  width: 100%;
  padding: 0.55rem;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
}

.calculator-inline output,
.lab-controls output {
  color: var(--red);
  font-family: var(--mono);
}

.numeric-output {
  padding: 0.7rem;
  overflow-wrap: anywhere;
  color: var(--ink) !important;
  font-family: var(--mono);
  border: 1px solid var(--line);
  background: var(--code);
}

.process-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem;
  margin-top: 1rem;
}

.process-strip span {
  min-height: 3rem;
  padding: 0.75rem;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.35;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.82);
}

.process-strip span:nth-child(2) {
  border-color: rgba(49, 79, 120, 0.45);
}

.process-strip span:nth-child(3) {
  border-color: rgba(169, 67, 47, 0.45);
}

.process-strip span:nth-child(4) {
  color: #fff;
  border-color: var(--accent);
  background: var(--accent);
}

.score-lab {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 1rem;
}

.lab-copy h3 {
  margin-bottom: 0.65rem;
}

.lab-controls {
  margin-top: 0.9rem;
}

.lab-controls label {
  flex: 1 1 120px;
}

.score-lab canvas {
  display: block;
  width: 100%;
  min-height: 290px;
  border: 1px solid var(--line);
  background: #fff;
}

.page-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  justify-content: center;
  padding: 2rem 1rem 3rem;
}

.page-footer a {
  padding: 0.48rem 0.7rem;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 780;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.76);
}

.page-footer a:hover,
.page-footer a:focus-visible {
  color: #fff;
  border-color: var(--ink);
  background: var(--ink);
  outline: none;
}

@media (max-width: 860px) {
  .site-header {
    gap: 0.7rem;
    align-items: flex-start;
    flex-direction: column;
  }

  .module-nav {
    width: 100%;
    flex-wrap: wrap;
  }

  .module-nav a {
    flex: 1 1 8.5rem;
    text-align: center;
  }

  .lecture {
    width: min(100% - 1.25rem, 980px);
    padding-top: 1.2rem;
  }

  .paper-header {
    padding-top: 2.4rem;
  }

  .principle-grid,
  .two-column,
  .score-lab,
  .process-strip,
  .diagram-flow,
  .overview-diagram,
  .vae-flow,
  .latent-pipeline,
  .position-grid,
  .vq-grid,
  .distribution-demo,
  .trajectory-demo,
  .bridge-grid,
  .ar-grid-wrap,
  .post-visual,
  .post-panels,
  .noise-strip,
  .judgement-grid {
    grid-template-columns: 1fr;
  }

  .interface-table {
    overflow: visible;
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .interface-head {
    display: none;
  }

  .interface-row {
    grid-template-columns: 1fr;
    margin-top: 0.85rem;
    border: 1px solid var(--line);
    background: var(--panel);
    box-shadow: var(--shadow);
  }

  .interface-row:first-child {
    margin-top: 0;
  }

  .interface-row span {
    display: grid;
    grid-template-columns: minmax(7.4rem, 36%) minmax(0, 1fr);
    gap: 0.7rem;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .interface-row span:first-child {
    border-top: 0;
  }

  .interface-row span::before {
    color: var(--accent-deep);
    font-family: var(--mono);
    font-size: 0.72rem;
    font-weight: 850;
    text-transform: uppercase;
  }

  .interface-row span:nth-child(1)::before {
    content: "方法族";
  }

  .interface-row span:nth-child(2)::before {
    content: "可计算对象";
  }

  .interface-row span:nth-child(3)::before {
    content: "训练目标";
  }

  .interface-row span:nth-child(4)::before {
    content: "采样入口";
  }

  .panel-title {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .derivation-section,
  .method-block,
  .algorithm-panel,
  .derivation-widget,
  .calculator-inline,
  .score-lab,
  .visual-example,
  .sampling-steps,
  .judgement-card {
    padding: 0.95rem;
  }

  .flow-arrow {
    min-height: 2.2rem;
  }

  .trajectory-credit {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .site-header {
    padding-inline: 0.75rem;
  }

  .lecture {
    width: min(100% - 0.9rem, 980px);
  }

  .chapter {
    padding-top: 3rem;
  }

  .paper-header h1 {
    font-size: 2.7rem;
  }

  .segmented,
  .step-buttons {
    width: 100%;
  }

  .segmented button,
  .step-buttons button {
    flex: 1 1 auto;
  }

  .equation {
    padding: 0.75rem;
  }

  .algorithm code {
    font-size: 0.8rem;
  }

  .tradeoff-mini > div,
  .comparison-bars > div,
  .token-bar,
  .code-usage-row {
    grid-template-columns: 1fr;
  }

  .causal-mask {
    gap: 0.18rem;
    padding: 0.45rem;
  }

  .causal-mask span {
    min-height: 1.75rem;
    font-size: 0.68rem;
  }

  .visual-example canvas,
  .score-lab canvas {
    min-height: 240px;
  }
}