:root {
  --smu-brand: #0f766e;
  --smu-brand-dark: #134e4a;
  --smu-accent: #b45309;
  --smu-ink: #17202a;
  --smu-muted: #64748b;
  --smu-surface: #f7fbfa;
  --smu-border: #d9e5e2;
}

body {
  color: var(--smu-ink);
  background: #fbfcfc;
  line-height: 1.72;
}

.navbar {
  border-bottom: 1px solid rgba(15, 118, 110, 0.18);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.navbar-title {
  font-weight: 750;
  letter-spacing: 0;
}

.sidebar nav[role="doc-toc"] ul > li > a.active,
.sidebar nav[role="doc-toc"] ul > li > a:hover,
#quarto-sidebar a.active,
#quarto-sidebar a:hover {
  color: var(--smu-brand);
}

.quarto-title h1,
h1,
h2,
h3 {
  letter-spacing: 0;
}

h2 {
  border-bottom: 1px solid var(--smu-border);
  padding-bottom: 0.35rem;
  margin-top: 2.4rem;
}

a {
  color: #0f6f68;
  text-underline-offset: 0.18em;
}

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

.hero {
  background: var(--smu-surface);
  border: 1px solid var(--smu-border);
  border-left: 8px solid var(--smu-brand);
  border-radius: 8px;
  padding: clamp(2rem, 4vw, 4rem);
  margin: 1.25rem 0 2rem;
}

.hero h1 {
  font-size: clamp(2.35rem, 5vw, 4rem);
  line-height: 1.05;
  margin-bottom: 0.75rem;
}

.hero .subtitle {
  color: var(--smu-muted);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  max-width: 760px;
}

.hero-actions,
.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.button,
.link-row a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.6rem;
  padding: 0.58rem 0.95rem;
  border-radius: 6px;
  border: 1px solid var(--smu-border);
  background: #ffffff;
  color: var(--smu-brand-dark);
  font-weight: 650;
  text-decoration: none;
}

.button.primary {
  background: var(--smu-brand);
  border-color: var(--smu-brand);
  color: #ffffff;
}

.button:hover,
.link-row a:hover {
  border-color: var(--smu-accent);
  color: var(--smu-accent);
}

.button.primary:hover {
  background: var(--smu-brand-dark);
  color: #ffffff;
}

.feature-grid,
.course-grid,
.stat-grid {
  display: grid;
  gap: 1rem;
  margin: 1.4rem 0 2rem;
}

.feature-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.course-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.stat-grid {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.feature-card,
.course-card,
.stat-card {
  background: #ffffff;
  border: 1px solid var(--smu-border);
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.045);
}

.feature-card h3,
.course-card h3,
.stat-card h3 {
  margin-top: 0;
  margin-bottom: 0.45rem;
  font-size: 1.08rem;
}

.stat-card strong {
  display: block;
  color: var(--smu-brand-dark);
  font-size: 1.7rem;
  line-height: 1.15;
}

.stat-card span,
.feature-card p,
.course-card p {
  color: var(--smu-muted);
}

table {
  border: 1px solid var(--smu-border);
  border-radius: 8px;
  overflow: hidden;
}

thead th {
  background: #eef7f5;
  color: var(--smu-brand-dark);
}

.callout {
  border-radius: 8px;
  border-left-width: 5px;
}

.callout-icon-container {
  display: none !important;
}

.bi,
.toc-actions {
  display: none !important;
}

.panel-tabset .nav-tabs {
  border-bottom-color: var(--smu-border);
}

.panel-tabset .nav-tabs .nav-link.active {
  border-color: var(--smu-border) var(--smu-border) #ffffff;
  color: var(--smu-brand-dark);
  font-weight: 700;
}

pre code {
  font-size: 0.92rem;
}

@media (max-width: 720px) {
  .hero {
    padding: 1.5rem;
  }

  .hero-actions,
  .link-row {
    flex-direction: column;
  }

  .button,
  .link-row a {
    width: 100%;
  }
}