:root {
  --bg: #ffffff;
  --fg: #16181d;
  --muted: #6b7280;
  --accent: #1a7f5a;
  --border: #e5e7eb;
  --card: #fafafa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1114;
    --fg: #e8eaed;
    --muted: #9aa2ad;
    --accent: #4ecb96;
    --border: #262a31;
    --card: #16191e;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding: 3rem 1.25rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 42rem;
  margin: 0 auto;
}

h1 {
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  margin: 2.25rem 0 0.5rem;
}

h3 {
  font-size: 1rem;
  margin: 1.75rem 0 0.4rem;
}

p,
ul {
  margin: 0 0 1rem;
}

ul {
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.4rem;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.muted {
  color: var(--muted);
}

/* Home */
.home {
  text-align: center;
  padding-top: 4rem;
}

.home .tagline {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 30rem;
  margin: 0 auto 2.5rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.links a {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--fg);
  text-decoration: none;
  font-size: 0.95rem;
}

.links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Sub-pages */
.effective {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.back {
  display: inline-block;
  margin-bottom: 2rem;
  font-size: 0.9rem;
  text-decoration: none;
}

footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}