:root {
  --bg: #fbfbf9;
  --fg: #1c1c1a;
  --muted: #6b6b66;
  --rule: #e6e6e1;
  --link: #2a5d8f;
  --link-hover: #1a3a5a;
  --accent: #f4f4f0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16161a;
    --fg: #e6e6e2;
    --muted: #9a9a92;
    --rule: #2c2c30;
    --link: #88b4dd;
    --link-hover: #b6d3ee;
    --accent: #1e1e23;
  }
}

* { box-sizing: border-box; }

html {
  font-size: 18px;
  -webkit-text-size-adjust: 100%;
}
@media (max-width: 480px) {
  html { font-size: 17px; }
}

body {
  max-width: 39rem;
  margin: 0 auto;
  padding: 6rem 1.5rem 8rem;
  font-family: Charter, "Iowan Old Style", "Palatino Linotype", Palatino,
    Georgia, "Times New Roman", serif;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--link) 35%, transparent);
  transition: color 0.15s ease, border-color 0.15s ease;
}
a:hover {
  color: var(--link-hover);
  border-bottom-color: currentColor;
}

h1, h2, h3 {
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
h1 {
  font-size: 1.55rem;
  margin: 0 0 0.4rem;
}
h2 {
  font-size: 1.1rem;
  margin: 2.75rem 0 0.6rem;
  color: var(--fg);
}

p { margin: 0 0 1.15rem; }

/* Landing intro line */
.lede {
  color: var(--muted);
  font-size: 1.05rem;
  margin-bottom: 2.25rem;
}

/* Link list (landing, indexes) */
ul.links {
  list-style: none;
  padding: 0;
  margin: 0 0 2.5rem;
}
ul.links li {
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--rule);
}
ul.links li:first-child { border-top: 1px solid var(--rule); }
ul.links a {
  border-bottom: none;
  font-weight: 600;
}
ul.links a:hover { color: var(--link-hover); }
ul.links .note {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0.1rem;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}
.meta a {
  color: var(--muted);
  border-bottom-color: var(--rule);
}
.meta a:hover { color: var(--fg); }

/* Back-link above inner-page titles */
.topnav {
  margin-bottom: 2.5rem;
  font-size: 0.9rem;
}

hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2.75rem 0;
}

blockquote {
  margin: 1.2rem 0;
  padding-left: 1.1rem;
  border-left: 2px solid var(--rule);
  color: var(--muted);
}

footer {
  margin-top: 4rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.85rem;
}