:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --background: #f4f7f8;
  --surface: #ffffff;
  --text: #122126;
  --muted: #51636a;
  --accent: #087f70;
  --border: #d7e0e3;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #0e171a;
    --surface: #152226;
    --text: #eef6f6;
    --muted: #b0c1c5;
    --accent: #6bd8c5;
    --border: #33474d;
  }
}

* { box-sizing: border-box; }

body {
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
  margin: 0;
}

header, main, footer {
  margin: 0 auto;
  max-width: 780px;
  padding: 1.5rem;
}

header { padding-top: 3rem; }

main {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1rem;
}

h1, h2 { line-height: 1.2; }
h2 { margin-top: 2rem; }
p, li { max-width: 70ch; }
.eyebrow, .meta { color: var(--muted); }
.eyebrow { font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }

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

nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  list-style: none;
  padding: 0;
}

footer { color: var(--muted); font-size: .95rem; }