:root {
  --ink: #25211d;
  --muted: #655f57;
  --paper: #fbfaf6;
  --band: #f2efe7;
  --line: #ded7c8;
  --teal: #176b63;
  --teal-deep: #0f4d47;
  --clay: #b75d45;
  --gold: #c2912e;
  --plum: #5c4a72;
  --white: #ffffff;
}

body {
  background: var(--paper);
  color: var(--ink);
}

a {
  color: var(--teal-deep);
}

a:hover {
  color: var(--clay);
}

.navbar {
  background: rgba(251, 250, 246, 0.96);
  border-bottom: 1px solid var(--line);
}

.navbar-title {
  color: var(--ink);
  font-weight: 700;
}

.nav-link {
  color: var(--ink);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--teal-deep);
}

.quarto-title-banner {
  background: var(--band);
  color: var(--ink);
}

body.home-page #title-block-header {
  display: none;
}

body.home-page #quarto-margin-sidebar {
  margin-top: 38rem;
}

.home-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 2rem;
  align-items: center;
  background:
    linear-gradient(135deg, rgba(23, 107, 99, 0.10), transparent 42%),
    linear-gradient(315deg, rgba(183, 93, 69, 0.10), transparent 46%),
    var(--band);
  border-bottom: 1px solid var(--line);
  margin: -2rem calc(50% - 50vw) 2rem;
  padding: 4rem max(1.25rem, calc((100vw - 1120px) / 2)) 3.5rem;
}

.intro-copy h1 {
  color: var(--ink);
  font-size: 3rem;
  line-height: 1.05;
  margin-bottom: 1rem;
}

.intro-copy p {
  color: var(--muted);
  font-size: 1.18rem;
  line-height: 1.7;
  max-width: 680px;
}

.intro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.btn {
  border-radius: 6px;
  font-weight: 700;
  padding: 0.7rem 1rem;
  text-decoration: none;
}

.btn-primary {
  background: var(--teal-deep);
  border-color: var(--teal-deep);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--white);
}

.btn-outline {
  border: 1px solid var(--teal-deep);
  color: var(--teal-deep);
}

.btn-outline:hover {
  background: var(--teal-deep);
  color: var(--white);
}

.causal-visual {
  border: 1px solid rgba(37, 33, 29, 0.16);
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(37, 33, 29, 0.06) 1px, transparent 1px),
    linear-gradient(rgba(37, 33, 29, 0.06) 1px, transparent 1px),
    rgba(255, 255, 255, 0.58);
  background-size: 28px 28px;
  box-shadow: 0 18px 40px rgba(37, 33, 29, 0.10);
  padding: 1.25rem;
}

.visual-topline,
.visual-footline {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 700;
}

.visual-footline {
  margin-top: 1rem;
}

.node-row {
  align-items: center;
  display: grid;
  gap: 0.8rem;
  grid-template-columns: 1fr auto 1fr;
  margin-top: 1.4rem;
}

.node-row.lower {
  grid-template-columns: repeat(3, 1fr);
}

.causal-node {
  border: 1px solid rgba(37, 33, 29, 0.18);
  border-radius: 8px;
  color: var(--ink);
  font-weight: 800;
  min-height: 86px;
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.causal-arrow {
  color: var(--clay);
  font-size: 2rem;
  font-weight: 800;
}

.treatment {
  background: rgba(23, 107, 99, 0.14);
}

.outcome {
  background: rgba(183, 93, 69, 0.14);
}

.confounder {
  background: rgba(194, 145, 46, 0.18);
}

.mechanism {
  background: rgba(92, 74, 114, 0.14);
}

.policy {
  background: rgba(23, 107, 99, 0.10);
}

.signal-strip {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 2rem 0 2.25rem;
}

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

.pillar-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.25rem;
}

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

.pillar-card p {
  color: var(--muted);
}

.signal-item,
.feature-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.1rem;
}

.signal-item p,
.feature-card p {
  color: var(--muted);
}

.feature-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 1rem 0 2rem;
}

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

.roadmap {
  background: var(--band);
  border-left: 5px solid var(--teal);
  padding: 1rem 1.25rem;
}

.quarto-listing .card {
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: none;
}

.quarto-listing .card-title {
  color: var(--ink);
  font-weight: 800;
}

.notebook-sequence {
  padding-left: 1.4rem;
}

.notebook-sequence li {
  margin: 0.35rem 0;
}

.notebook-sequence a {
  font-weight: 700;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

.track-grid,
.portfolio-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1.25rem 0 2rem;
}

.track-card,
.portfolio-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1.1rem 1.15rem;
}

.track-card h3,
.portfolio-card h3 {
  font-size: 1.08rem;
  line-height: 1.3;
  margin: 0 0 0.45rem;
}

.track-card p,
.portfolio-card p {
  color: var(--muted);
  margin-bottom: 0.7rem;
}

.track-meta,
.portfolio-meta {
  color: var(--muted);
  display: block;
  font-size: 0.92rem;
  font-weight: 700;
  margin-top: 0.5rem;
}

.sequence-note {
  background: var(--band);
  border-left: 5px solid var(--teal);
  color: var(--muted);
  margin: 1rem 0 1.5rem;
  padding: 0.9rem 1rem;
}

.notebook-source-note {
  color: var(--muted);
  font-size: 0.96rem;
}

.category {
  border-radius: 6px;
}

main.content {
  padding-bottom: 3rem;
}

h1,
h2,
h3 {
  color: var(--ink);
}

h2 {
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.35rem;
}

blockquote {
  border-left: 5px solid var(--clay);
  color: var(--muted);
}

code {
  color: var(--plum);
}

mjx-container[display="true"],
.math.display {
  display: block;
  margin: 1rem 0;
  overflow-x: auto;
  text-align: center !important;
}

footer.footer {
  background: var(--band);
  border-top: 1px solid var(--line);
}

@media (max-width: 900px) {
  .home-intro {
    grid-template-columns: 1fr;
    padding-top: 3rem;
  }

  .intro-copy h1 {
    font-size: 2.35rem;
  }

  .signal-strip,
  .pillar-grid,
  .feature-grid,
  .track-grid,
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .intro-copy h1 {
    font-size: 2rem;
  }

  .intro-copy p {
    font-size: 1.04rem;
  }

  .causal-visual {
    padding: 0.9rem;
  }

  .node-row,
  .node-row.lower {
    grid-template-columns: 1fr;
  }

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