:root {
  --bg: #f7f8f5;
  --surface: #ffffff;
  --surface-muted: #eef3ef;
  --ink: #17211c;
  --muted: #5d6b64;
  --line: #d8e0da;
  --accent: #285c4d;
  --accent-dark: #173c34;
  --accent-soft: #dfeae4;
  --gold: #a6752d;
  --shadow: 0 16px 42px rgba(23, 33, 28, 0.09);
  --container-max: 1120px;
  --container-pad: 24px;
  --nav-offset: 96px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-offset);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.65;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 248, 245, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.nav {
  width: min(var(--container-max), calc(100% - (var(--container-pad) * 2)));
  margin: 0 auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  color: var(--accent-dark);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0;
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.92rem;
}

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

.nav-links a:hover,
.nav-links a:focus {
  color: var(--accent-dark);
}

.hero {
  width: min(var(--container-max), calc(100% - (var(--container-pad) * 2)));
  margin: 0 auto;
  padding: 96px 0 70px;
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.55fr);
  gap: 42px;
  align-items: center;
}

.hero-content {
  max-width: 780px;
}

.eyebrow,
.panel-label {
  margin: 0 0 12px;
  color: var(--gold);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 8px;
  color: var(--accent-dark);
  font-size: clamp(3.7rem, 10vw, 7.2rem);
  line-height: 0.96;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  color: var(--accent-dark);
  font-size: clamp(1.65rem, 3.2vw, 2.55rem);
  line-height: 1.16;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  color: var(--accent-dark);
  font-size: 1.22rem;
  line-height: 1.25;
  letter-spacing: 0;
}

.subtitle {
  margin-bottom: 18px;
  color: var(--ink);
  font-size: clamp(1.45rem, 3vw, 2.3rem);
  line-height: 1.18;
}

.tagline {
  max-width: 680px;
  margin-bottom: 30px;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1.08rem;
  line-height: 1.65;
}

.authors {
  margin: 24px 0 0;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.98rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  color: var(--accent-dark);
  background: transparent;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.94rem;
  font-weight: 700;
  text-decoration: none;
}

.button:hover,
.button:focus {
  background: var(--accent-soft);
}

.button.primary {
  color: #ffffff;
  background: var(--accent);
}

.button.primary:hover,
.button.primary:focus {
  background: var(--accent-dark);
}

.hero-panel {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-panel p {
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
}

.math-callout,
.formula {
  color: var(--accent-dark);
  border: 1px solid var(--line);
  background: var(--surface-muted);
  font-family: "Times New Roman", Georgia, serif;
  font-weight: 700;
  text-align: center;
}

.math-callout {
  margin-top: 22px;
  padding: 18px 12px;
  border-radius: 8px;
  font-size: 1.45rem;
}

.section {
  width: min(var(--container-max), calc(100% - (var(--container-pad) * 2)));
  margin: 0 auto;
  padding: 84px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: var(--nav-offset);
}

.section.compact {
  max-width: 980px;
}

.section-heading {
  max-width: 760px;
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1rem;
}

.figure-placeholder {
  margin-top: 34px;
  min-height: 220px;
  display: grid;
  place-items: center;
  padding: 28px;
  border: 1px dashed #aebbb2;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.64);
  color: var(--muted);
  text-align: center;
}

.figure-placeholder span {
  display: block;
  margin-bottom: 4px;
  color: var(--accent-dark);
  font-family: Arial, Helvetica, sans-serif;
  font-weight: 700;
}

.figure-placeholder p {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}

.figure-placeholder.wide {
  min-height: 280px;
}

.paper-figure {
  width: 100%;
  max-width: 980px;
  margin: 48px auto 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
}

.paper-figure.wide {
  max-width: 980px;
  margin-top: 48px;
}

.paper-figure img {
  display: block;
  width: 100%;
  max-width: 880px;
  height: auto;
  margin: 0 auto;
  border: 1px solid rgba(29, 52, 40, 0.14);
  border-radius: 6px;
  background: #fff;
  object-fit: contain;
}

.paper-figure img[hidden] {
  display: none;
}

.paper-figure.wide img {
  max-width: 920px;
}

.paper-figure figcaption {
  max-width: 880px;
  margin: 14px auto 0;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.92rem;
  line-height: 1.45;
}

.paper-figure.wide figcaption {
  max-width: 920px;
}

.paper-figure figcaption span {
  display: block;
  margin-bottom: 4px;
  color: var(--accent-dark);
  font-weight: 700;
}

.paper-figure figcaption p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.accent {
  width: 100%;
  max-width: none;
  padding: 90px var(--container-pad);
  background: var(--accent-dark);
  border-top: 0;
}

.question-wrap {
  width: min(980px, 100%);
  margin: 0 auto;
}

.accent .eyebrow {
  color: #d6b36d;
}

.accent h2 {
  color: #ffffff;
}

.inline-math {
  font-family: "Times New Roman", Georgia, serif;
  white-space: nowrap;
}

mjx-container {
  max-width: 100%;
}

.inline-math mjx-container {
  display: inline-block;
  vertical-align: baseline;
}

.math-callout mjx-container,
.formula mjx-container {
  display: block;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 2px;
}

.formula {
  width: min(520px, 100%);
  margin-top: 28px;
  padding: 26px;
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
  border-radius: 8px;
  font-size: clamp(1.8rem, 6vw, 3rem);
}

.term-list {
  width: min(820px, 100%);
  margin-top: 28px;
  display: grid;
  gap: 10px;
  color: rgba(255, 255, 255, 0.82);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.98rem;
  line-height: 1.58;
}

.term-list p {
  margin: 0;
}

.term-list strong {
  color: #ffffff;
}

.steps {
  display: grid;
  gap: 18px;
}

.step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 20px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.step p,
.lead {
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1rem;
}

.step-index {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #ffffff;
  background: var(--accent);
  font-family: Arial, Helvetica, sans-serif;
  font-weight: 700;
}

.lead {
  max-width: 860px;
  line-height: 1.75;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.card {
  min-height: 210px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.card p {
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.98rem;
}

.demo-section {
  padding-bottom: 72px;
}

.demo-shell {
  margin-top: 34px;
}

.demo-controls {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.74);
}

.control-group {
  min-width: 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 10px;
  align-items: center;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.86rem;
  line-height: 1.35;
}

.control-group span {
  color: var(--accent-dark);
  font-weight: 700;
}

.control-group select,
.control-group input[type="range"] {
  grid-column: 1 / -1;
}

.control-group select {
  width: 100%;
  min-height: 40px;
  padding: 0 34px 0 11px;
  border: 1px solid #b9c7bf;
  border-radius: 6px;
  color: var(--ink);
  background: #ffffff;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.92rem;
}

.control-group output {
  min-width: 42px;
  color: var(--gold);
  font-weight: 700;
  text-align: right;
}

.control-group input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.demo-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(340px, 1.25fr);
  gap: 18px;
  align-items: stretch;
}

.demo-panel {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 10px 28px rgba(23, 33, 28, 0.07);
}

.demo-panel-heading {
  min-height: 78px;
  margin-bottom: 10px;
}

.demo-panel-heading h3 {
  margin-bottom: 6px;
}

.demo-panel-heading p,
.demo-legend,
.risk-explainer,
.demo-note {
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.92rem;
  line-height: 1.48;
}

.demo-panel-heading p,
.risk-explainer {
  margin-bottom: 0;
}

.demo-panel canvas {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid #d2dcd5;
  border-radius: 6px;
  background: #fbfcfa;
}

.demo-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  margin-top: 12px;
}

.demo-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.legend-dot {
  width: 11px;
  height: 11px;
  display: inline-block;
  border-radius: 50%;
}

.legend-dot.selected {
  background: #b26a2c;
  box-shadow: 0 0 0 3px rgba(178, 106, 44, 0.22);
}

.legend-dot.vertex {
  background: var(--accent);
}

.legend-dot.inside {
  background: #285c4d;
}

.legend-dot.outside {
  background: #b84d3f;
}

.legend-swatch {
  width: 18px;
  height: 11px;
  display: inline-block;
  border: 1px solid rgba(55, 105, 129, 0.32);
  border-radius: 2px;
}

.legend-swatch.inverse {
  background: rgba(69, 132, 156, 0.2);
}

.outcome-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.9rem;
  line-height: 1.45;
}

.risk-panel {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(180px, 0.36fr) minmax(280px, 0.64fr);
  gap: 18px;
  align-items: start;
}

.risk-panel .demo-panel-heading {
  grid-column: 1 / -1;
  min-height: 0;
  margin-bottom: 0;
}

.risk-number {
  min-height: 150px;
  display: grid;
  align-content: center;
  justify-items: start;
  padding: 22px;
  border: 1px solid rgba(40, 92, 77, 0.22);
  border-radius: 8px;
  background: var(--surface-muted);
}

.risk-number span {
  color: var(--accent-dark);
  font-family: Arial, Helvetica, sans-serif;
  font-size: clamp(2.7rem, 7vw, 4.8rem);
  font-weight: 800;
  line-height: 0.95;
}

.risk-number small {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.98rem;
}

.risk-bars {
  display: grid;
  gap: 11px;
}

.risk-row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) 52px;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.9rem;
}

.risk-label {
  color: var(--accent-dark);
  font-weight: 700;
}

.risk-track {
  display: block;
  height: 14px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(40, 92, 77, 0.12);
}

.risk-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
}

.risk-row.is-selected .risk-fill {
  background: #b26a2c;
}

.risk-row.is-selected .risk-label {
  color: #8b4d1e;
}

.risk-row-value {
  color: var(--accent-dark);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.risk-explainer {
  grid-column: 2;
  max-width: 680px;
}

.demo-note {
  margin: 20px 0 0;
  padding: 16px 18px;
  border-left: 4px solid var(--gold);
  background: rgba(255, 255, 255, 0.62);
}

.placeholder-section {
  padding: 40px 0;
}

.placeholder-content {
  padding: 32px;
  border: 1px dashed #aebbb2;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.62);
}

.placeholder-content p:last-child {
  max-width: 780px;
  margin-bottom: 0;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
}

.citation pre {
  overflow-x: auto;
  margin: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #13211b;
  color: #f5f2e8;
  font-size: 0.95rem;
  line-height: 1.55;
}

.footer {
  width: min(var(--container-max), calc(100% - (var(--container-pad) * 2)));
  margin: 0 auto;
  padding: 30px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.92rem;
}

.footer p {
  margin: 0;
}

@media (max-width: 820px) {
  :root {
    --nav-offset: 136px;
  }

  html {
    scroll-padding-top: var(--nav-offset);
  }

  .section {
    scroll-margin-top: var(--nav-offset);
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 14px 0;
  }

  .nav-links {
    width: 100%;
    flex-wrap: wrap;
    gap: 12px 18px;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 58px;
  }

  .two-column,
  .cards,
  .demo-controls,
  .demo-grid,
  .risk-panel {
    grid-template-columns: 1fr;
  }

  .risk-explainer {
    grid-column: 1;
  }
}

@media (max-width: 560px) {
  :root {
    --container-pad: 18px;
  }

  .hero {
    padding-bottom: 50px;
  }

  .section {
    padding: 54px 0;
  }

  .accent {
    padding: 64px var(--container-pad);
  }

  .button {
    width: 100%;
  }

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

  .hero-panel,
  .placeholder-content,
  .demo-controls,
  .demo-panel,
  .card,
  .step {
    padding: 22px;
  }

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

  .control-group output {
    text-align: left;
  }

  .risk-row {
    grid-template-columns: 52px minmax(0, 1fr) 48px;
  }
}