:root {
  --ink: #1c2229;
  --muted: #5b6672;
  --bg: #fafbfc;
  --card: #eef4f2;
  --accent: #0f6b5c;
  --accent-strong: #095447;
  --rule: #dde3e8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e6eaee;
    --muted: #9aa5b0;
    --bg: #14181d;
    --card: #1b2622;
    --accent: #4fbba6;
    --accent-strong: #6bd4be;
    --rule: #2a323a;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1.0625rem/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

a {
  color: var(--accent-strong);
}

a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.site-header,
main,
footer {
  max-width: 41rem;
  margin: 0 auto;
  padding-inline: 1.25rem;
}

.site-header {
  padding-top: 1.5rem;
}

.brand {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.brand a {
  color: var(--accent);
  text-decoration: none;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 0.75rem;
  font-size: 0.9375rem;
}

main {
  padding-block: 2rem 4rem;
}

h1 {
  margin: 0.5rem 0 0.25rem;
  font-size: clamp(2rem, 6vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h2 {
  margin: 2.25rem 0 0.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: 1.1875rem;
  letter-spacing: -0.01em;
}

.meta {
  margin: 0 0 2rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

.summary {
  margin: 0 0 2.5rem;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: var(--card);
}

.summary p {
  margin: 0.4rem 0;
}

.summary strong {
  color: var(--accent-strong);
}

p,
li {
  max-width: 65ch;
}

ul {
  padding-left: 1.25rem;
}

footer {
  margin-top: 3rem;
  padding-block: 1.25rem 2rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9375rem;
}