:root {
  color-scheme: light dark;
  --bg: #f7f5ef;
  --panel: #ffffff;
  --ink: #171914;
  --muted: #5d6258;
  --line: #d9d4c7;
  --accent: #2f6f4e;
  --accent-ink: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: var(--accent);
  font-weight: 650;
}

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  padding: 32px 0 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  display: grid;
  place-items: center;
  font-weight: 900;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

nav a {
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  padding: 8px 12px;
  text-decoration: none;
  background: color-mix(in srgb, var(--panel) 78%, transparent);
}

main {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(22px, 4vw, 42px);
  margin-bottom: 36px;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.06);
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.05;
}

h2 {
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 1.35rem;
}

h3 {
  margin-top: 24px;
}

p,
li {
  font-size: 1rem;
}

.lede {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 70ch;
}

.effective {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: color-mix(in srgb, var(--panel) 92%, var(--bg));
}

.card h2 {
  border: 0;
  padding: 0;
  margin: 0 0 8px;
  font-size: 1.15rem;
}

footer {
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0 0 40px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10130f;
    --panel: #181d17;
    --ink: #f2f4ef;
    --muted: #b8beb1;
    --line: #343a32;
    --accent: #8ccaa1;
    --accent-ink: #10130f;
  }
}