:root {
  --text: #1a1a1a;
  --muted: #555;
  --accent: #2c5f7c;
  --accent-hover: #1d4359;
  --rule: #e5e5e5;
  --bg: #ffffff;
  --bg-alt: #f7f8fa;
  --max: 760px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}

a:hover {
  color: var(--accent-hover);
  border-bottom-color: currentColor;
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

header.site {
  border-bottom: 1px solid var(--rule);
  padding: 2.5rem 0 1.25rem;
}

.site-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0 0 0.25rem;
  letter-spacing: -0.01em;
}

.site-title a {
  color: var(--text);
  border: none;
}

.site-tagline {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

nav.primary {
  margin-top: 1.5rem;
}

nav.primary ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

nav.primary a {
  font-size: 0.95rem;
  color: var(--muted);
  border: none;
  padding-bottom: 2px;
}

nav.primary a:hover,
nav.primary a[aria-current="page"] {
  color: var(--accent);
  border-bottom: 1px solid currentColor;
}

main {
  padding: 2.5rem 0 4rem;
}

main h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 1.5rem;
  letter-spacing: -0.01em;
}

main h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 2rem 0 0.5rem;
}

main p {
  margin: 0 0 1.25rem;
}

main ul, main ol {
  padding-left: 1.25rem;
  margin: 0 0 1.25rem;
}

main li {
  margin-bottom: 0.4rem;
}

.lede p {
  font-size: 1.05rem;
  color: var(--text);
}

.callout {
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 2px;
}

.callout p:last-child { margin-bottom: 0; }

figure {
  margin: 2rem 0;
  text-align: center;
}

figure img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: 4px;
}

figcaption {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.chart-embed {
  margin: 1.5rem 0;
  border: 1px solid var(--rule);
  border-radius: 4px;
  overflow: hidden;
}

.chart-embed iframe {
  display: block;
  width: 100%;
  border: 0;
}

footer.site {
  border-top: 1px solid var(--rule);
  padding: 1.5rem 0;
  font-size: 0.875rem;
  color: var(--muted);
  text-align: center;
}

footer.site a {
  color: var(--muted);
}

@media (max-width: 600px) {
  body { font-size: 16px; }
  header.site { padding-top: 1.75rem; }
  .site-title { font-size: 1.4rem; }
  main { padding: 2rem 0 3rem; }
  main h1 { font-size: 1.3rem; }
  nav.primary ul { gap: 1rem 1.25rem; }
}