:root {
  --bg: #f6f7f7;
  --surface: #ffffff;
  --text: #16201f;
  --muted: #56615f;
  --line: #dde3e2;
  --accent: #0d7f74;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1413;
    --surface: #151d1c;
    --text: #e3ebea;
    --muted: #97a4a2;
    --line: #26312f;
    --accent: #3cc9b8;
  }
}

* { box-sizing: border-box; }

html { font-size: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1rem/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.page {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2.5rem 1rem 4rem;
}

header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
}

.mark {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
}

nav { display: flex; flex-wrap: wrap; gap: 1rem; font-size: 0.9375rem; }

a { color: var(--accent); }
nav a { text-decoration: none; }
nav a[aria-current="page"] { color: var(--text); }

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 0.5rem; }
h2 { font-size: 1.25rem; margin: 2.25rem 0 0.5rem; }

.lead { font-size: 1.125rem; color: var(--muted); margin-top: 0; }
.meta { color: var(--muted); font-size: 0.9375rem; }

ul { padding-left: 1.25rem; }
li + li { margin-top: 0.375rem; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  margin: 1rem 0;
}

code {
  font: 0.875em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  overflow-wrap: anywhere;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.875rem;
}